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FFH scientific research papers database
FFH database search (1991-2022):
1421.
Miljanić, Š S; Maksić, A; Laušević, Z V
Isotope effects in: A) catalytic generation of hydrogen from sodium tetrahydridoborate and b) Oxydation of hydrogen in fuel cells Journal Article
In: Chemical Industry and Chemical Engineering Quarterly, vol. 11, no. 3, pp. 124-128, 2005.
@article{Miljanić2005124,
title = {Isotope effects in: A) catalytic generation of hydrogen from sodium tetrahydridoborate and b) Oxydation of hydrogen in fuel cells},
author = {Š S Miljanić and A Maksić and Z V Laušević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034444029&doi=10.2298%2fCICEQ0503124M&partnerID=40&md5=94dbf6be1b804916edfb20f5782f6991},
doi = {10.2298/CICEQ0503124M},
year = {2005},
date = {2005-01-01},
journal = {Chemical Industry and Chemical Engineering Quarterly},
volume = {11},
number = {3},
pages = {124-128},
abstract = {We have investigated deuterium/hydrogen (D/H) isotope effects a) during catalytic evolution of hydrogen gas from the water solution of sodium tetrahydridoborate (NaBH4), the sodium borohydride fueled hydrogen generator HGen-E, Fractal Carbon, with the carbon monolith supported platinum reactor was used; b) oxidation of hydrogen in a PEM-type fuel cell to produce electrical energy We used the E-TEK membrane electrode assemblies with an active area of 4 cm2, assembled in a two fuel cell stack. Both processes are important as possible parts of an energy-hydrogen- energy cycle. Any transfer of energy into hydrogen or vice versa induces a change of the D/H isotope ratio, which can be considered from the isotope separation point of view and possible development of a method to produce heavy water as a by-product of the above cycle. In this way, the separation efficiency can contribute to the overall efficiency of the cycle. This work is an initiative to take the isotope effects into account while cycling energy via some specific processes. We measured the isotope separation factor (α) of the single-stage process, as a basic parameter determining the isotope separation efficiency. The results proved that deuterium migrated to the dense (liquid) phase in both systems. Average values of the obtained separation factors are: α(a) = 5.4 α(b)>72. The results obtained could serve for a model for optimization purposes rather than to improve the separation efficiency of a particular unit. To do that it would primarily be necessary to play with a variety of catalysts, which was beyond the main aim of this work. © 2005, CI and CEQ. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have investigated deuterium/hydrogen (D/H) isotope effects a) during catalytic evolution of hydrogen gas from the water solution of sodium tetrahydridoborate (NaBH4), the sodium borohydride fueled hydrogen generator HGen-E, Fractal Carbon, with the carbon monolith supported platinum reactor was used; b) oxidation of hydrogen in a PEM-type fuel cell to produce electrical energy We used the E-TEK membrane electrode assemblies with an active area of 4 cm2, assembled in a two fuel cell stack. Both processes are important as possible parts of an energy-hydrogen- energy cycle. Any transfer of energy into hydrogen or vice versa induces a change of the D/H isotope ratio, which can be considered from the isotope separation point of view and possible development of a method to produce heavy water as a by-product of the above cycle. In this way, the separation efficiency can contribute to the overall efficiency of the cycle. This work is an initiative to take the isotope effects into account while cycling energy via some specific processes. We measured the isotope separation factor (α) of the single-stage process, as a basic parameter determining the isotope separation efficiency. The results proved that deuterium migrated to the dense (liquid) phase in both systems. Average values of the obtained separation factors are: α(a) = 5.4 α(b)>72. The results obtained could serve for a model for optimization purposes rather than to improve the separation efficiency of a particular unit. To do that it would primarily be necessary to play with a variety of catalysts, which was beyond the main aim of this work. © 2005, CI and CEQ. All rights reserved.
1422.
Kuzmanović, M; Savović, J; Pavlović, M; Stoiljković, M; Antić-JOVANOVIĆ, A; Marinković, M
In: Journal of the Serbian Chemical Society, vol. 70, no. 8-9, pp. 1033-1040, 2005.
@article{Kuzmanović20051033,
title = {Influence of easily ionised elements on the delayed responses of the emission intensities of an analyte in a power modulated U-shaped argon stabilised DC arc plasma with an aerosol supply},
author = {M Kuzmanović and J Savović and M Pavlović and M Stoiljković and A Antić-JOVANOVIĆ and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544452121&doi=10.2298%2fJSC0509033K&partnerID=40&md5=0b469bb6da867323ae7ffc0b98dca37e},
doi = {10.2298/JSC0509033K},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {8-9},
pages = {1033-1040},
abstract = {The current of a U-shaped argon stabilised DC arc was square modulated with a 40 Hz repetition frequency between 6 and 3 A. The delayed line intensity responses to the modulation of the arc current were investigated using calcium as a representative analyte. The intensities of both the atomic and ionic lines were monitored at different distances from the arc axis in the presence of various concentrations of the easily ionised element. Temporal evolutions were monitored on a millisecond time scale. It was found that the responses of the line intesity to the arc current change strongly depended on the observed radial position, especially in the vicinity of the arc axis. The obtained results showed a significant influence of even small amounts of the easily ionised element on the excitation and transport of the analyte and indicated a way of possibly improving the analytical capabilities of the excitation source.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The current of a U-shaped argon stabilised DC arc was square modulated with a 40 Hz repetition frequency between 6 and 3 A. The delayed line intensity responses to the modulation of the arc current were investigated using calcium as a representative analyte. The intensities of both the atomic and ionic lines were monitored at different distances from the arc axis in the presence of various concentrations of the easily ionised element. Temporal evolutions were monitored on a millisecond time scale. It was found that the responses of the line intesity to the arc current change strongly depended on the observed radial position, especially in the vicinity of the arc axis. The obtained results showed a significant influence of even small amounts of the easily ionised element on the excitation and transport of the analyte and indicated a way of possibly improving the analytical capabilities of the excitation source.
1423.
Maksimović, V; Mojović, M; Neumann, G; Vučinić, Ž
Nonenzymatic reaction of dihydroxyacetone with hydrogen peroxide enhanced via a Fenton reaction Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 461-465, 2005.
@article{Maksimović2005461,
title = {Nonenzymatic reaction of dihydroxyacetone with hydrogen peroxide enhanced via a Fenton reaction},
author = {V Maksimović and M Mojović and G Neumann and Ž Vučinić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144438518&doi=10.1196%2fannals.1342.067&partnerID=40&md5=68a6ddb9953ecf969461a1912870520e},
doi = {10.1196/annals.1342.067},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {461-465},
abstract = {An analysis of the reaction of dihydroxyacetone with hydrogen peroxide was performed using HPLC with electrochemical and spectrophotometric detection and EPR spectroscopy of the reactants and products. Glycolate production in such a reaction has been documented, and the glycolate yield analyzed at different pH values. The participation of hydroxyl free radical is shown with DEPMPO spin trap. Two types of mechanisms are proposed, one at higher pH values and pronounced participation of free radicals (enhanced by the presence of metal ions and Fenton reaction) and the other at lower pH values, with decreased free radical production and lower glycolate yield. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An analysis of the reaction of dihydroxyacetone with hydrogen peroxide was performed using HPLC with electrochemical and spectrophotometric detection and EPR spectroscopy of the reactants and products. Glycolate production in such a reaction has been documented, and the glycolate yield analyzed at different pH values. The participation of hydroxyl free radical is shown with DEPMPO spin trap. Two types of mechanisms are proposed, one at higher pH values and pronounced participation of free radicals (enhanced by the presence of metal ions and Fenton reaction) and the other at lower pH values, with decreased free radical production and lower glycolate yield. © 2005 New York Academy of Sciences.
1424.
Janković, B; Adnadević, B; Jovanović, J
Non-isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 82, no. 1, pp. 7-13, 2005.
@article{Janković20057,
title = {Non-isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel},
author = {B Janković and B Adnadević and J Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-30444435947&doi=10.1007%2fs10973-005-0885-1&partnerID=40&md5=c58f28a0a3909f8c6284b308d4f48a7b},
doi = {10.1007/s10973-005-0885-1},
year = {2005},
date = {2005-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {82},
number = {1},
pages = {7-13},
abstract = {Kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel was investigated using methods of non-isothermal thermal analysis. Methods of Kissinger, Coats-Redfern, Van Krevelen and Horowitz-Metzger were applied for determination the kinetics parameters: activation energy (E), pre-exponent (lnA) as well as the kinetics model f(α) for the process of hydrogel dehydration under different heating rates. An existence of good agreement between determined values of kinetic parameters (Eand A), which were obtained applying different methods under the same heating rate. Functional relationship between changes of kinetic parameters of dehydration and changes of heating rate was established. An existence of compensation effect is accepted and explanation of compensation effect appearance during the hydrogel dehydration is suggested. © 2005 Akadémiai Kiadó, Budapest.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel was investigated using methods of non-isothermal thermal analysis. Methods of Kissinger, Coats-Redfern, Van Krevelen and Horowitz-Metzger were applied for determination the kinetics parameters: activation energy (E), pre-exponent (lnA) as well as the kinetics model f(α) for the process of hydrogel dehydration under different heating rates. An existence of good agreement between determined values of kinetic parameters (Eand A), which were obtained applying different methods under the same heating rate. Functional relationship between changes of kinetic parameters of dehydration and changes of heating rate was established. An existence of compensation effect is accepted and explanation of compensation effect appearance during the hydrogel dehydration is suggested. © 2005 Akadémiai Kiadó, Budapest.
1425.
Obradović, N; Labus, N; Srećković, T; Minić, D; Ristić, M M
Synthesis and characterization of zinc titanate nano-crystal powders obtained by mechanical activation Journal Article
In: Science of Sintering, vol. 37, no. 2, pp. 123-129, 2005.
@article{Obradović2005123,
title = {Synthesis and characterization of zinc titanate nano-crystal powders obtained by mechanical activation},
author = {N Obradović and N Labus and T Srećković and D Minić and M M Ristić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33746641804&doi=10.2298%2fSOS0502123O&partnerID=40&md5=cbdaef82a9ea218582a3dc913046d0e6},
doi = {10.2298/SOS0502123O},
year = {2005},
date = {2005-01-01},
journal = {Science of Sintering},
volume = {37},
number = {2},
pages = {123-129},
abstract = {Development of dielectric materials for microwave frequencies is increasing with rapid progress in mobile and satellite communications systems, where zinc titanates have found application due to their semi-conducting and dielectric properties. Mechanical activation by grinding is a well-known method and common part of the powder preparation route in the field of ceramics. The aim of this work is investigation of the influence of experimental conditions for mechanochemical synthesis of zinc orthotitanate. Starting powder mixtures of ZnO and TiO 2 , in the molar ratio that is in accordance with the stoichiometry of zinc titanate spinel type Zn 2 TiO 4 were mechanically activated using a high-energy planetary ball mill. The process of mechanical activation was performed during different time intervals from 0 to 300 minutes. Microstructure characterization was determined by X-ray diffraction analysis and scanning electron microscopy. Also, the specific surface area (SSA) of powders samples was measured by a nitrogen gas sorption analyzer using the BET method. The very first traces of zinc titanate are detectable after only 5 minutes of activation. The most interesting occurrence during the mechanical method of activation is that we have an almost pure phase after 90 minutes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Development of dielectric materials for microwave frequencies is increasing with rapid progress in mobile and satellite communications systems, where zinc titanates have found application due to their semi-conducting and dielectric properties. Mechanical activation by grinding is a well-known method and common part of the powder preparation route in the field of ceramics. The aim of this work is investigation of the influence of experimental conditions for mechanochemical synthesis of zinc orthotitanate. Starting powder mixtures of ZnO and TiO 2 , in the molar ratio that is in accordance with the stoichiometry of zinc titanate spinel type Zn 2 TiO 4 were mechanically activated using a high-energy planetary ball mill. The process of mechanical activation was performed during different time intervals from 0 to 300 minutes. Microstructure characterization was determined by X-ray diffraction analysis and scanning electron microscopy. Also, the specific surface area (SSA) of powders samples was measured by a nitrogen gas sorption analyzer using the BET method. The very first traces of zinc titanate are detectable after only 5 minutes of activation. The most interesting occurrence during the mechanical method of activation is that we have an almost pure phase after 90 minutes.
1426.
Mojović, M; Spasojević, I; Vuletić, M; Vučinić, Ž; Bačić, G
An EPR spin-probe and spin-trap study of the free radicals produced by plant plasma membranes Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 2, pp. 177-186, 2005.
@article{Mojović2005177,
title = {An EPR spin-probe and spin-trap study of the free radicals produced by plant plasma membranes},
author = {M Mojović and I Spasojević and M Vuletić and Ž Vučinić and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144441582&doi=10.2298%2fJSC0502177M&partnerID=40&md5=2f12dac6d99a81a7aa36c81912db03b3},
doi = {10.2298/JSC0502177M},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {2},
pages = {177-186},
abstract = {Plant plasma membranes are known to produce superoxide radicals, while the production of hydroxyl radical is thought to occur only in the cell wall. In this work it was demonstrated using combined spin-trap and spin-probe EPR spectroscopic techniques, that plant plasma membranes do produce superoxide and hydroxyl radicals but by kinetically different mechanisms. The results show that superoxide and hydroxyl radicals can be detected by DMPO spin-trap and that the mechanisms and location of their production can be differentiated using the reduction of spin-probes Tempone and 7-DS. It was shown that the mechanism of production of oxygen reactive species is NADH dependent and diphenylene iodonium inhibited. The kinetics of the reduction of Tempone, combined with scavengers or the absence of NADH indicates that hydroxyl radicals are produced by a mechanism independent of that of superoxide production. It was shown that a combination of the spin-probe and spin-trap technique can be used in free radical studies of biological systems, with a number of advantages inherent to them.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Plant plasma membranes are known to produce superoxide radicals, while the production of hydroxyl radical is thought to occur only in the cell wall. In this work it was demonstrated using combined spin-trap and spin-probe EPR spectroscopic techniques, that plant plasma membranes do produce superoxide and hydroxyl radicals but by kinetically different mechanisms. The results show that superoxide and hydroxyl radicals can be detected by DMPO spin-trap and that the mechanisms and location of their production can be differentiated using the reduction of spin-probes Tempone and 7-DS. It was shown that the mechanism of production of oxygen reactive species is NADH dependent and diphenylene iodonium inhibited. The kinetics of the reduction of Tempone, combined with scavengers or the absence of NADH indicates that hydroxyl radicals are produced by a mechanism independent of that of superoxide production. It was shown that a combination of the spin-probe and spin-trap technique can be used in free radical studies of biological systems, with a number of advantages inherent to them.
1427.
Minić, D M; Žák, T; Schneeweiss, O; Pizúrová, N; Ristić, M M
Synthesis and properties of Fe-W powder Journal Article
In: Czechoslovak Journal of Physics, vol. 55, no. 7, pp. 823-834, 2005.
@article{Minić2005823,
title = {Synthesis and properties of Fe-W powder},
author = {D M Minić and T Žák and O Schneeweiss and N Pizúrová and M M Ristić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-26044460613&doi=10.1007%2fs10582-005-0084-0&partnerID=40&md5=cc357cf6ee3bb45b9b2fe17b08588943},
doi = {10.1007/s10582-005-0084-0},
year = {2005},
date = {2005-01-01},
journal = {Czechoslovak Journal of Physics},
volume = {55},
number = {7},
pages = {823-834},
abstract = {This paper deals with the study of Fe-W powders, which were prepared by electrolyzing, and their stabilized properties. The synthesized Fe-W powders were studied using X-ray diffraction, thermal analysis, Mossbauer spectroscopy and thermomagnetic measurement. A poor hydrogen absorption occurred. After the heat treatment at 800°C, the amorphous and α-Fe(W) phases were decomposed into prevailing α-Fe with approx. 3 at.% W accompanied by the W(Fe), λ-Fe 2 W, and Fe 2+ in oxide phases.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper deals with the study of Fe-W powders, which were prepared by electrolyzing, and their stabilized properties. The synthesized Fe-W powders were studied using X-ray diffraction, thermal analysis, Mossbauer spectroscopy and thermomagnetic measurement. A poor hydrogen absorption occurred. After the heat treatment at 800°C, the amorphous and α-Fe(W) phases were decomposed into prevailing α-Fe with approx. 3 at.% W accompanied by the W(Fe), λ-Fe 2 W, and Fe 2+ in oxide phases.
1428.
Davidović, M; Čajkovski, T; Colomban, Ph.; Mioč, U B; Likar-Smiljanić, V; Čajkovski, D; Biljić, R; Nedić, Z
The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 2881-2885, 2005.
@article{Davidović20052881,
title = {The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts},
author = {M Davidović and T Čajkovski and Ph. Colomban and U B Mioč and V Likar-Smiljanić and D Čajkovski and R Biljić and Z Nedić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944454882&doi=10.1016%2fj.ssi.2005.09.020&partnerID=40&md5=de6beb3f3fc4ef51429806504ebf1a28},
doi = {10.1016/j.ssi.2005.09.020},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {2881-2885},
abstract = {The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH - and various forms of hydrated proton H(H2O) +n. Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some WPA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10- 11 s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some WPA salts with longer relaxation times of the order of 10- 7-10- 5 s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH - and various forms of hydrated proton H(H2O) +n. Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some WPA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10- 11 s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some WPA salts with longer relaxation times of the order of 10- 7-10- 5 s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. © 2005 Elsevier B.V. All rights reserved.
1429.
Mioč, U B; Todorović, M R; Davidović, M; Colomban, Ph.; Holclajtner-Antunović, I
Heteropoly compounds - From proton conductors to biomedical agents Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 3005-3017, 2005.
@article{Mioč20053005,
title = {Heteropoly compounds - From proton conductors to biomedical agents},
author = {U B Mioč and M R Todorović and M Davidović and Ph. Colomban and I Holclajtner-Antunović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944433631&doi=10.1016%2fj.ssi.2005.09.056&partnerID=40&md5=fad7bf6f0a877da7d4ef4fd9dd632a4e},
doi = {10.1016/j.ssi.2005.09.056},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {3005-3017},
abstract = {Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. © 2005 Elsevier B.V. All rights reserved.
1430.
Stojić, D. Lj.; Cekić, B D; Maksić, A D; Kaninski, M P M; Miljanić, Š S
Intermetallics as cathode materials in the electrolytic hydrogen production Journal Article
In: International Journal of Hydrogen Energy, vol. 30, no. 1, pp. 21-28, 2005.
@article{Stojić200521,
title = {Intermetallics as cathode materials in the electrolytic hydrogen production},
author = {D.Lj. Stojić and B D Cekić and A D Maksić and M P M Kaninski and Š S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-9544226467&doi=10.1016%2fj.ijhydene.2004.05.005&partnerID=40&md5=3ffa56f32436ac2f3a0294553f906354},
doi = {10.1016/j.ijhydene.2004.05.005},
year = {2005},
date = {2005-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {30},
number = {1},
pages = {21-28},
abstract = {The intermetallics of transition metals have been investigated as cathode materials for the production of hydrogen by electrolysis from water-KOH solutions, in an attempt to increase the electrolytic process efficiency. We found that the best effect among all investigated cathodes (Hf 2 Fe, Zr-Pt, Nb-Pd(I), Pd-Ta, Nb-Pd(II), Ti-Pt) exhibits the Hf 2 Fe phase. These materials were compared with conventional cathodes (Fe and Ni), often used in the alkaline electrolysis. A significant upgrade of the electrolytic efficiency using intermetallics, either in pure KOH electrolyte or in combination with ionic activators added in situ, was achieved. The effects of these cathode materials on the process efficiency were discussed in the context of transition metal features that issue from their electronic configuration. © 2004 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The intermetallics of transition metals have been investigated as cathode materials for the production of hydrogen by electrolysis from water-KOH solutions, in an attempt to increase the electrolytic process efficiency. We found that the best effect among all investigated cathodes (Hf 2 Fe, Zr-Pt, Nb-Pd(I), Pd-Ta, Nb-Pd(II), Ti-Pt) exhibits the Hf 2 Fe phase. These materials were compared with conventional cathodes (Fe and Ni), often used in the alkaline electrolysis. A significant upgrade of the electrolytic efficiency using intermetallics, either in pure KOH electrolyte or in combination with ionic activators added in situ, was achieved. The effects of these cathode materials on the process efficiency were discussed in the context of transition metal features that issue from their electronic configuration. © 2004 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
1431.
Vukojević, V; Pramanik, A; Yakovleva, T; Rigler, R; Terenius, L; Bakalkin, G
Study of molecular events in cells by fluorescence correlation spectroscopy Journal Article
In: Cellular and Molecular Life Sciences, vol. 62, no. 5, pp. 535-550, 2005.
@article{Vukojević2005535,
title = {Study of molecular events in cells by fluorescence correlation spectroscopy},
author = {V Vukojević and A Pramanik and T Yakovleva and R Rigler and L Terenius and G Bakalkin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-15344341160&doi=10.1007%2fs00018-004-4305-7&partnerID=40&md5=63cca218a48eea9de6fa5c1be9fe363f},
doi = {10.1007/s00018-004-4305-7},
year = {2005},
date = {2005-01-01},
journal = {Cellular and Molecular Life Sciences},
volume = {62},
number = {5},
pages = {535-550},
abstract = {To understand processes in a living cell, sophisticated and creative approaches are required that can be used for gathering quantitative information about large number of components interacting across temporal and spatial scales without major disruption of the integral network of processes. A physical method of analysis that can meet these requirements is fluorescence correlation spectroscopy (FCS), which is an ultrasensitive and non-invasive detection method capable of single-molecule and real-time resolution. Since its introduction about 3 decades ago, this until recently emerging technology has reached maturity. As commercially built equipment is now available, FCS is extensively applied for extracting biological information from living cells unattainable by other methods, and new biological concepts are formulated based on findings by FCS. In this review, we focus on examples in the field of molecular cellular biology. The versatility of the technique in this field is illustrated in studies of single-molecule dynamics and conformational flexibility of proteins, and the relevance of conformational flexibility for biological functions regarding the multispecificity of antibodies, modulation of activity of C5a receptors in clathrin-mediated endocytosis and multiplicity of functional responses mediated by the p53 tumor suppressor protein; quantitative characterization of physicochemical properties of the cellular interior; protein trafficking; and ligand-receptor interactions. FCS can also be used to study cell-to-cell communication, here exemplified by clustering of apoptotic cells via bystander killing by hydrogen peroxide. © Birkhäuser Verlag, Basel, 2005.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
To understand processes in a living cell, sophisticated and creative approaches are required that can be used for gathering quantitative information about large number of components interacting across temporal and spatial scales without major disruption of the integral network of processes. A physical method of analysis that can meet these requirements is fluorescence correlation spectroscopy (FCS), which is an ultrasensitive and non-invasive detection method capable of single-molecule and real-time resolution. Since its introduction about 3 decades ago, this until recently emerging technology has reached maturity. As commercially built equipment is now available, FCS is extensively applied for extracting biological information from living cells unattainable by other methods, and new biological concepts are formulated based on findings by FCS. In this review, we focus on examples in the field of molecular cellular biology. The versatility of the technique in this field is illustrated in studies of single-molecule dynamics and conformational flexibility of proteins, and the relevance of conformational flexibility for biological functions regarding the multispecificity of antibodies, modulation of activity of C5a receptors in clathrin-mediated endocytosis and multiplicity of functional responses mediated by the p53 tumor suppressor protein; quantitative characterization of physicochemical properties of the cellular interior; protein trafficking; and ligand-receptor interactions. FCS can also be used to study cell-to-cell communication, here exemplified by clustering of apoptotic cells via bystander killing by hydrogen peroxide. © Birkhäuser Verlag, Basel, 2005.
1432.
Popović-Bijelić, A; Bijelić, G; Kolar-Anić, L; Vukojević, V
Numerically simulated pH-induced reactivation of catalytic activity of horseradish peroxidase Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 457-460, 2005.
@article{Popović-Bijelić2005457,
title = {Numerically simulated pH-induced reactivation of catalytic activity of horseradish peroxidase},
author = {A Popović-Bijelić and G Bijelić and L Kolar-Anić and V Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144516627&doi=10.1196%2fannals.1342.066&partnerID=40&md5=bb99bab1865537e3f20490c77be754c8},
doi = {10.1196/annals.1342.066},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {457-460},
abstract = {A model mechanism that accounts for the experimentally observed pH-dependent enhancement of enzymatic activity of horseradish peroxidase through the catalase-like pathway is proposed. Predictions of the model are tested against a number of experimental results to confirm that kinetic constants used in the numerical simulation are correctly chosen and that the model can be used to emulate the reaction between horseradish peroxidase and hydrogen peroxide in a wide range of conditions. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A model mechanism that accounts for the experimentally observed pH-dependent enhancement of enzymatic activity of horseradish peroxidase through the catalase-like pathway is proposed. Predictions of the model are tested against a number of experimental results to confirm that kinetic constants used in the numerical simulation are correctly chosen and that the model can be used to emulate the reaction between horseradish peroxidase and hydrogen peroxide in a wide range of conditions. © 2005 New York Academy of Sciences.
1433.
Jelić, S; Čupić, Z; Kolar-Anić, L
Mathematical modeling of the hypothalamic-pituitary-adrenal system activity Journal Article
In: Mathematical Biosciences, vol. 197, no. 2, pp. 173-187, 2005.
@article{Jelić2005173,
title = {Mathematical modeling of the hypothalamic-pituitary-adrenal system activity},
author = {S Jelić and Z Čupić and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25844487749&doi=10.1016%2fj.mbs.2005.06.006&partnerID=40&md5=1910008e83b56d79d1f0a962264e7d90},
doi = {10.1016/j.mbs.2005.06.006},
year = {2005},
date = {2005-01-01},
journal = {Mathematical Biosciences},
volume = {197},
number = {2},
pages = {173-187},
abstract = {Mathematical modeling has proven to be valuable in understanding of the complex biological systems dynamics. In the present report we have developed an initial model of the hypothalamic-pituitary-adrenal system self-regulatory activity. A four-dimensional non-linear differential equation model of the hormone secretion was formulated and used to analyze plasma cortisol levels in humans. The aim of this work was to explore in greater detail the role of this system in normal, homeostatic, conditions, since it is the first and unavoidable step in further understanding of the role of this complex neuroendocrine system in pathophysiological conditions. Neither the underlying mechanisms nor the physiological significance of this system are fully understood yet. © 2005 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mathematical modeling has proven to be valuable in understanding of the complex biological systems dynamics. In the present report we have developed an initial model of the hypothalamic-pituitary-adrenal system self-regulatory activity. A four-dimensional non-linear differential equation model of the hormone secretion was formulated and used to analyze plasma cortisol levels in humans. The aim of this work was to explore in greater detail the role of this system in normal, homeostatic, conditions, since it is the first and unavoidable step in further understanding of the role of this complex neuroendocrine system in pathophysiological conditions. Neither the underlying mechanisms nor the physiological significance of this system are fully understood yet. © 2005 Elsevier Inc. All rights reserved.
1434.
Mladenović, M; Perić, M; Engels, B
An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 Π electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 121, no. 24, pp. 12361-12370, 2004.
@article{Mladenović200412361,
title = {An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 Π electronic state of CCCH},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844439422&doi=10.1063%2f1.1818680&partnerID=40&md5=26c5d4911a0b1a5dd15640fe2ecbbac5},
doi = {10.1063/1.1818680},
year = {2004},
date = {2004-01-01},
journal = {Journal of Chemical Physics},
volume = {121},
number = {24},
pages = {12361-12370},
abstract = {The results of ab initio calculations of the vibronically averaged components of the anisotropic magnetic hyperfine tensor in the low-lying vibronic species of the X 2 Π electronic state of CCCH and CCCD are reported. The electronically averaged hyperfine coupling constants for hydrogen and 13 C in 12 C 12 C 12 CH, 13 C 12 C 12 CH, 12 C 13 C 12 CH, 12 C 12 C 13 CH, and 12 C 12 C 12 CD are obtained as functions of two bending vibrational modes by the density functional theory method. The vibronic wave functions are calculated with help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. The results of the present study help to reliably interpret the experimental data previously published and predict the yet unobserved hyperfine structure in excited vibronic states of CCCH and CCCD. © 2004 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of ab initio calculations of the vibronically averaged components of the anisotropic magnetic hyperfine tensor in the low-lying vibronic species of the X 2 Π electronic state of CCCH and CCCD are reported. The electronically averaged hyperfine coupling constants for hydrogen and 13 C in 12 C 12 C 12 CH, 13 C 12 C 12 CH, 12 C 13 C 12 CH, 12 C 12 C 13 CH, and 12 C 12 C 12 CD are obtained as functions of two bending vibrational modes by the density functional theory method. The vibronic wave functions are calculated with help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. The results of the present study help to reliably interpret the experimental data previously published and predict the yet unobserved hyperfine structure in excited vibronic states of CCCH and CCCD. © 2004 American Institute of Physics.
1435.
Mladenović, M; Perić, M; Jerosimić, S; Engels, B
Ab initia study of the hyperfine structure of the X 2 π electronic state of HCCS Journal Article
In: Molecular Physics, vol. 102, no. 23-24, pp. 2623-2634, 2004.
@article{Mladenović20042623,
title = {Ab initia study of the hyperfine structure of the X 2 π electronic state of HCCS},
author = {M Mladenović and M Perić and S Jerosimić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-10944232599&doi=10.1080%2f00268970412331292876&partnerID=40&md5=ccfad4589c060a2b61f6210f5856ba7c},
doi = {10.1080/00268970412331292876},
year = {2004},
date = {2004-01-01},
journal = {Molecular Physics},
volume = {102},
number = {23-24},
pages = {2623-2634},
abstract = {The results of an ab initio study of the magnetic hyperfine structure of the X 2 π electronic state of HCCS and DCCS are reported. The potential surfaces for two components of the X 2 π electronic state and the electronically averaged hyperfine coupling constants for H, D, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. Since the bending potential curves calculated in the present study do not differ significantly from their counterparts computed in our previous work by means of an extensive configuration interaction approach, we employ the latter here to avoid the appearance of small differences between the vibronic energy levels presented in this work and those already published. The vibronic wave functions are calculated with the help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. It is found that, due to the generally significant geometry dependence of the hyperfine coupling constants, it is necessary to carry out vibronic averaging of the corresponding functions in order to obtain values which can be compared with the results of measurements. The results of the present study are an aid to the reliable interpretation of recently published experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of an ab initio study of the magnetic hyperfine structure of the X 2 π electronic state of HCCS and DCCS are reported. The potential surfaces for two components of the X 2 π electronic state and the electronically averaged hyperfine coupling constants for H, D, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. Since the bending potential curves calculated in the present study do not differ significantly from their counterparts computed in our previous work by means of an extensive configuration interaction approach, we employ the latter here to avoid the appearance of small differences between the vibronic energy levels presented in this work and those already published. The vibronic wave functions are calculated with the help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. It is found that, due to the generally significant geometry dependence of the hyperfine coupling constants, it is necessary to carry out vibronic averaging of the corresponding functions in order to obtain values which can be compared with the results of measurements. The results of the present study are an aid to the reliable interpretation of recently published experimental data.
1436.
Rakić, V; Dondur, V; Gajinov, S; Auroux, A
Calorimetric study of room temperature adsorption of N 2 O and CO on Cu(II)-exchanged ZSM5 zeolites Journal Article
In: Thermochimica Acta, vol. 420, no. 1-2 SPEC. ISS., pp. 51-57, 2004.
@article{Rakić200451,
title = {Calorimetric study of room temperature adsorption of N 2 O and CO on Cu(II)-exchanged ZSM5 zeolites},
author = {V Rakić and V Dondur and S Gajinov and A Auroux},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4644301705&doi=10.1016%2fj.tca.2003.12.030&partnerID=40&md5=d05ebb2b05dd31e0654ae4a654ecaeff},
doi = {10.1016/j.tca.2003.12.030},
year = {2004},
date = {2004-01-01},
journal = {Thermochimica Acta},
volume = {420},
number = {1-2 SPEC. ISS.},
pages = {51-57},
abstract = {Copper ion-exchanged ZSM5 zeolites have been prepared with different cooper loadings from under- to over-exchanged levels. The adsorptions of N 2 O and CO at 303 K have been studied using calorimetric method and infrared spectroscopy. The samples were additionally characterised by ammonia adsorption at 423 K. The active sites for both N 2 O and CO are Cu(I) ions, which were formed as a result of pre-treatment in vacuum at 673 K. Room temperature adsorption of nitrous oxide at low equilibrium pressures (up to 66.7 Pa) resulted in small amounts of chemisorbed N 2 O (<0.2 molecule per one Cu ion). Differential heats of N 2 O adsorption between 80 and 30 kJ/mol were obtained. Differential heats of CO adsorption between 140 and 40 kJ/mol were obtained. The obtained amounts of chemisorbed species in the investigated systems and the values of differential heats of both nitrous oxide and carbon monoxide demonstrate the dependence on the copper content. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copper ion-exchanged ZSM5 zeolites have been prepared with different cooper loadings from under- to over-exchanged levels. The adsorptions of N 2 O and CO at 303 K have been studied using calorimetric method and infrared spectroscopy. The samples were additionally characterised by ammonia adsorption at 423 K. The active sites for both N 2 O and CO are Cu(I) ions, which were formed as a result of pre-treatment in vacuum at 673 K. Room temperature adsorption of nitrous oxide at low equilibrium pressures (up to 66.7 Pa) resulted in small amounts of chemisorbed N 2 O (<0.2 molecule per one Cu ion). Differential heats of N 2 O adsorption between 80 and 30 kJ/mol were obtained. Differential heats of CO adsorption between 140 and 40 kJ/mol were obtained. The obtained amounts of chemisorbed species in the investigated systems and the values of differential heats of both nitrous oxide and carbon monoxide demonstrate the dependence on the copper content. © 2004 Elsevier B.V. All rights reserved.
1437.
Korićanac, Z; Jovanović, T; Petković, J; Minić, D
Spectrophotometric investigation of famotidine-Pd(II) complex and its analytical application in drug analysis Journal Article
In: Journal of the Serbian Chemical Society, vol. 69, no. 6, pp. 485-491, 2004.
@article{Korićanac2004485,
title = {Spectrophotometric investigation of famotidine-Pd(II) complex and its analytical application in drug analysis},
author = {Z Korićanac and T Jovanović and J Petković and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4143116689&doi=10.2298%2fJSC0406485K&partnerID=40&md5=9186a978edcdefb5d7fd3ea1e8caa8c4},
doi = {10.2298/JSC0406485K},
year = {2004},
date = {2004-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {69},
number = {6},
pages = {485-491},
abstract = {By using different spectrophotometric methods, it was found that famotidine and palladium(II) ions form a complex, Pd(II): famotidine = 1:1. which has an absorption maximum at 345 nm. The formation of the complex between famotidine and palladium(II) chloride in Britton-Robinson buffer solution in the pH range 2.23-8.50 was studied. The conditional stability constant of the complex at the optimum pH 2.62 and ionic strength 0.5 M was found to be log K′ = 3.742 ± 0.025. The Beer's law was verified over the famotidine concentration range from 5 × 10-5 - 6 × 10-4 M. The proposed method was found to be suitable for accurate and sensitive analysis of famotidine both as the substance (RSD = 1.02-1.80%) and its dosage forms (RSD = 1.75-1.83%).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By using different spectrophotometric methods, it was found that famotidine and palladium(II) ions form a complex, Pd(II): famotidine = 1:1. which has an absorption maximum at 345 nm. The formation of the complex between famotidine and palladium(II) chloride in Britton-Robinson buffer solution in the pH range 2.23-8.50 was studied. The conditional stability constant of the complex at the optimum pH 2.62 and ionic strength 0.5 M was found to be log K′ = 3.742 ± 0.025. The Beer's law was verified over the famotidine concentration range from 5 × 10-5 - 6 × 10-4 M. The proposed method was found to be suitable for accurate and sensitive analysis of famotidine both as the substance (RSD = 1.02-1.80%) and its dosage forms (RSD = 1.75-1.83%).
1438.
Perić, M; Mladenović, M; Engels, B
An ab initio study of the hyperfine structure in the X 2 ∏ electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 121, no. 6, pp. 2636-2645, 2004.
@article{Perić20042636,
title = {An ab initio study of the hyperfine structure in the X 2 ∏ electronic state of CCCH},
author = {M Perić and M Mladenović and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4344579083&doi=10.1063%2f1.1768162&partnerID=40&md5=e6db8a52890cd4f3b5d91b31cb691d86},
doi = {10.1063/1.1768162},
year = {2004},
date = {2004-01-01},
journal = {Journal of Chemical Physics},
volume = {121},
number = {6},
pages = {2636-2645},
abstract = {The ab initio study of the magnetic hyperfine structure in the X 2 II electronic state of CCCH are reported. An extensive configuration interaction approach was used to compute the potential surfaces for the two components of the X 2 II electronic state.The vibronic wave functions were calculated with the help of a variational approach with Renner-Teller effect and spin-orbit coupling. It was found that, due to strong geometry dependence of the hyperfine coupling constraints, vibronic averaging of the corresponding functions was carried out to obtain the values to compare with the results of the measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The ab initio study of the magnetic hyperfine structure in the X 2 II electronic state of CCCH are reported. An extensive configuration interaction approach was used to compute the potential surfaces for the two components of the X 2 II electronic state.The vibronic wave functions were calculated with the help of a variational approach with Renner-Teller effect and spin-orbit coupling. It was found that, due to strong geometry dependence of the hyperfine coupling constraints, vibronic averaging of the corresponding functions was carried out to obtain the values to compare with the results of the measurements.
1439.
Perić, M; Mladenović, M; Engels, B
An ab initio study of the vibronic, spin-orbit and hyperfine coupling in the X2Π electronic state of the CCCD radical Journal Article
In: Chemical Physics Letters, vol. 393, no. 4-6, pp. 552-557, 2004.
@article{Perić2004552,
title = {An ab initio study of the vibronic, spin-orbit and hyperfine coupling in the X2Π electronic state of the CCCD radical},
author = {M Perić and M Mladenović and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-3242891793&doi=10.1016%2fj.cplett.2004.06.097&partnerID=40&md5=4545a229d7b687d993514f06132f3086},
doi = {10.1016/j.cplett.2004.06.097},
year = {2004},
date = {2004-01-01},
journal = {Chemical Physics Letters},
volume = {393},
number = {4-6},
pages = {552-557},
abstract = {The results of an ab initio study of the vibronic, spin-orbit and magnetic hyperfine structure in the X2Π electronic state for the various isotopomers of the CCCD radical are reported. The bending vibronic energy levels and their splitting due to the spin-orbit coupling are calculated by means of a variational approach. The electronically averaged hyperfine coupling constants of D and 13C are obtained as functions of two bending vibrational modes by the density functional theory method. The results of this study help to reliably interpret the available experimental data and predict yet unobserved features in the ground and excited vibronic states. © 2004 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of an ab initio study of the vibronic, spin-orbit and magnetic hyperfine structure in the X2Π electronic state for the various isotopomers of the CCCD radical are reported. The bending vibronic energy levels and their splitting due to the spin-orbit coupling are calculated by means of a variational approach. The electronically averaged hyperfine coupling constants of D and 13C are obtained as functions of two bending vibrational modes by the density functional theory method. The results of this study help to reliably interpret the available experimental data and predict yet unobserved features in the ground and excited vibronic states. © 2004 Elsevier B.V.
1440.
Yakovleva, T; Kolesnikova, L; Vukojević, V; Gileva, I; Tan-No, K; Austen, M; Lüscher, B; Ekström, T J; Terenius, L; Bakalkin, G
YY1 binding to a subset of p53 DNA-target sites regulates p53-dependent transcription Journal Article
In: Biochemical and Biophysical Research Communications, vol. 318, no. 2, pp. 615-624, 2004.
@article{Yakovleva2004615,
title = {YY1 binding to a subset of p53 DNA-target sites regulates p53-dependent transcription},
author = {T Yakovleva and L Kolesnikova and V Vukojević and I Gileva and K Tan-No and M Austen and B Lüscher and T J Ekström and L Terenius and G Bakalkin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2342418830&doi=10.1016%2fj.bbrc.2004.04.065&partnerID=40&md5=fab449c508b944a2d0ca79f45d40a20e},
doi = {10.1016/j.bbrc.2004.04.065},
year = {2004},
date = {2004-01-01},
journal = {Biochemical and Biophysical Research Communications},
volume = {318},
number = {2},
pages = {615-624},
abstract = {The tumor suppressor protein p53 regulates gene transcription through binding to specific DNA-target sites. We here demonstrate that a subset of these sites is targeted by another DNA-binding factor. Binding specificity, reactivity with specific antibodies, and experiments with purified protein identified the factor as the multifunctional transcription regulator YY1. The YY1 core binding sequence ACAT is present in the center of p53-half-binding sites in the p21 and GADD45 genes regulating growth arrest and DNA repair, respectively, but is absent in those of the Bax gene critical for apoptosis. In transfection experiments YY1 inhibits p53-activated transcription from the p53-binding site that contains the ACAT sequence. YY1 and p53 are colocalized around the nucleoli and in discrete nuclear domains in PC12 cells undergoing apoptosis. YY1 might attenuate p53-dependent transcription from a subset of p53-target genes and this may be relevant for directing cells either to growth arrest or apoptosis upon p53 activation. © 2004 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The tumor suppressor protein p53 regulates gene transcription through binding to specific DNA-target sites. We here demonstrate that a subset of these sites is targeted by another DNA-binding factor. Binding specificity, reactivity with specific antibodies, and experiments with purified protein identified the factor as the multifunctional transcription regulator YY1. The YY1 core binding sequence ACAT is present in the center of p53-half-binding sites in the p21 and GADD45 genes regulating growth arrest and DNA repair, respectively, but is absent in those of the Bax gene critical for apoptosis. In transfection experiments YY1 inhibits p53-activated transcription from the p53-binding site that contains the ACAT sequence. YY1 and p53 are colocalized around the nucleoli and in discrete nuclear domains in PC12 cells undergoing apoptosis. YY1 might attenuate p53-dependent transcription from a subset of p53-target genes and this may be relevant for directing cells either to growth arrest or apoptosis upon p53 activation. © 2004 Elsevier Inc. All rights reserved.
2005
Miljanić, Š S; Maksić, A; Laušević, Z V
Isotope effects in: A) catalytic generation of hydrogen from sodium tetrahydridoborate and b) Oxydation of hydrogen in fuel cells Journal Article
In: Chemical Industry and Chemical Engineering Quarterly, vol. 11, no. 3, pp. 124-128, 2005.
@article{Miljanić2005124,
title = {Isotope effects in: A) catalytic generation of hydrogen from sodium tetrahydridoborate and b) Oxydation of hydrogen in fuel cells},
author = {Š S Miljanić and A Maksić and Z V Laušević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034444029&doi=10.2298%2fCICEQ0503124M&partnerID=40&md5=94dbf6be1b804916edfb20f5782f6991},
doi = {10.2298/CICEQ0503124M},
year = {2005},
date = {2005-01-01},
journal = {Chemical Industry and Chemical Engineering Quarterly},
volume = {11},
number = {3},
pages = {124-128},
abstract = {We have investigated deuterium/hydrogen (D/H) isotope effects a) during catalytic evolution of hydrogen gas from the water solution of sodium tetrahydridoborate (NaBH4), the sodium borohydride fueled hydrogen generator HGen-E, Fractal Carbon, with the carbon monolith supported platinum reactor was used; b) oxidation of hydrogen in a PEM-type fuel cell to produce electrical energy We used the E-TEK membrane electrode assemblies with an active area of 4 cm2, assembled in a two fuel cell stack. Both processes are important as possible parts of an energy-hydrogen- energy cycle. Any transfer of energy into hydrogen or vice versa induces a change of the D/H isotope ratio, which can be considered from the isotope separation point of view and possible development of a method to produce heavy water as a by-product of the above cycle. In this way, the separation efficiency can contribute to the overall efficiency of the cycle. This work is an initiative to take the isotope effects into account while cycling energy via some specific processes. We measured the isotope separation factor (α) of the single-stage process, as a basic parameter determining the isotope separation efficiency. The results proved that deuterium migrated to the dense (liquid) phase in both systems. Average values of the obtained separation factors are: α(a) = 5.4 α(b)>72. The results obtained could serve for a model for optimization purposes rather than to improve the separation efficiency of a particular unit. To do that it would primarily be necessary to play with a variety of catalysts, which was beyond the main aim of this work. © 2005, CI and CEQ. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have investigated deuterium/hydrogen (D/H) isotope effects a) during catalytic evolution of hydrogen gas from the water solution of sodium tetrahydridoborate (NaBH4), the sodium borohydride fueled hydrogen generator HGen-E, Fractal Carbon, with the carbon monolith supported platinum reactor was used; b) oxidation of hydrogen in a PEM-type fuel cell to produce electrical energy We used the E-TEK membrane electrode assemblies with an active area of 4 cm2, assembled in a two fuel cell stack. Both processes are important as possible parts of an energy-hydrogen- energy cycle. Any transfer of energy into hydrogen or vice versa induces a change of the D/H isotope ratio, which can be considered from the isotope separation point of view and possible development of a method to produce heavy water as a by-product of the above cycle. In this way, the separation efficiency can contribute to the overall efficiency of the cycle. This work is an initiative to take the isotope effects into account while cycling energy via some specific processes. We measured the isotope separation factor (α) of the single-stage process, as a basic parameter determining the isotope separation efficiency. The results proved that deuterium migrated to the dense (liquid) phase in both systems. Average values of the obtained separation factors are: α(a) = 5.4 α(b)>72. The results obtained could serve for a model for optimization purposes rather than to improve the separation efficiency of a particular unit. To do that it would primarily be necessary to play with a variety of catalysts, which was beyond the main aim of this work. © 2005, CI and CEQ. All rights reserved.
Kuzmanović, M; Savović, J; Pavlović, M; Stoiljković, M; Antić-JOVANOVIĆ, A; Marinković, M
In: Journal of the Serbian Chemical Society, vol. 70, no. 8-9, pp. 1033-1040, 2005.
@article{Kuzmanović20051033,
title = {Influence of easily ionised elements on the delayed responses of the emission intensities of an analyte in a power modulated U-shaped argon stabilised DC arc plasma with an aerosol supply},
author = {M Kuzmanović and J Savović and M Pavlović and M Stoiljković and A Antić-JOVANOVIĆ and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544452121&doi=10.2298%2fJSC0509033K&partnerID=40&md5=0b469bb6da867323ae7ffc0b98dca37e},
doi = {10.2298/JSC0509033K},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {8-9},
pages = {1033-1040},
abstract = {The current of a U-shaped argon stabilised DC arc was square modulated with a 40 Hz repetition frequency between 6 and 3 A. The delayed line intensity responses to the modulation of the arc current were investigated using calcium as a representative analyte. The intensities of both the atomic and ionic lines were monitored at different distances from the arc axis in the presence of various concentrations of the easily ionised element. Temporal evolutions were monitored on a millisecond time scale. It was found that the responses of the line intesity to the arc current change strongly depended on the observed radial position, especially in the vicinity of the arc axis. The obtained results showed a significant influence of even small amounts of the easily ionised element on the excitation and transport of the analyte and indicated a way of possibly improving the analytical capabilities of the excitation source.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The current of a U-shaped argon stabilised DC arc was square modulated with a 40 Hz repetition frequency between 6 and 3 A. The delayed line intensity responses to the modulation of the arc current were investigated using calcium as a representative analyte. The intensities of both the atomic and ionic lines were monitored at different distances from the arc axis in the presence of various concentrations of the easily ionised element. Temporal evolutions were monitored on a millisecond time scale. It was found that the responses of the line intesity to the arc current change strongly depended on the observed radial position, especially in the vicinity of the arc axis. The obtained results showed a significant influence of even small amounts of the easily ionised element on the excitation and transport of the analyte and indicated a way of possibly improving the analytical capabilities of the excitation source.
Maksimović, V; Mojović, M; Neumann, G; Vučinić, Ž
Nonenzymatic reaction of dihydroxyacetone with hydrogen peroxide enhanced via a Fenton reaction Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 461-465, 2005.
@article{Maksimović2005461,
title = {Nonenzymatic reaction of dihydroxyacetone with hydrogen peroxide enhanced via a Fenton reaction},
author = {V Maksimović and M Mojović and G Neumann and Ž Vučinić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144438518&doi=10.1196%2fannals.1342.067&partnerID=40&md5=68a6ddb9953ecf969461a1912870520e},
doi = {10.1196/annals.1342.067},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {461-465},
abstract = {An analysis of the reaction of dihydroxyacetone with hydrogen peroxide was performed using HPLC with electrochemical and spectrophotometric detection and EPR spectroscopy of the reactants and products. Glycolate production in such a reaction has been documented, and the glycolate yield analyzed at different pH values. The participation of hydroxyl free radical is shown with DEPMPO spin trap. Two types of mechanisms are proposed, one at higher pH values and pronounced participation of free radicals (enhanced by the presence of metal ions and Fenton reaction) and the other at lower pH values, with decreased free radical production and lower glycolate yield. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An analysis of the reaction of dihydroxyacetone with hydrogen peroxide was performed using HPLC with electrochemical and spectrophotometric detection and EPR spectroscopy of the reactants and products. Glycolate production in such a reaction has been documented, and the glycolate yield analyzed at different pH values. The participation of hydroxyl free radical is shown with DEPMPO spin trap. Two types of mechanisms are proposed, one at higher pH values and pronounced participation of free radicals (enhanced by the presence of metal ions and Fenton reaction) and the other at lower pH values, with decreased free radical production and lower glycolate yield. © 2005 New York Academy of Sciences.
Janković, B; Adnadević, B; Jovanović, J
Non-isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 82, no. 1, pp. 7-13, 2005.
@article{Janković20057,
title = {Non-isothermal kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel},
author = {B Janković and B Adnadević and J Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-30444435947&doi=10.1007%2fs10973-005-0885-1&partnerID=40&md5=c58f28a0a3909f8c6284b308d4f48a7b},
doi = {10.1007/s10973-005-0885-1},
year = {2005},
date = {2005-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {82},
number = {1},
pages = {7-13},
abstract = {Kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel was investigated using methods of non-isothermal thermal analysis. Methods of Kissinger, Coats-Redfern, Van Krevelen and Horowitz-Metzger were applied for determination the kinetics parameters: activation energy (E), pre-exponent (lnA) as well as the kinetics model f(α) for the process of hydrogel dehydration under different heating rates. An existence of good agreement between determined values of kinetic parameters (Eand A), which were obtained applying different methods under the same heating rate. Functional relationship between changes of kinetic parameters of dehydration and changes of heating rate was established. An existence of compensation effect is accepted and explanation of compensation effect appearance during the hydrogel dehydration is suggested. © 2005 Akadémiai Kiadó, Budapest.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kinetics of dehydration of equilibrium swollen poly(acrylic acid) hydrogel was investigated using methods of non-isothermal thermal analysis. Methods of Kissinger, Coats-Redfern, Van Krevelen and Horowitz-Metzger were applied for determination the kinetics parameters: activation energy (E), pre-exponent (lnA) as well as the kinetics model f(α) for the process of hydrogel dehydration under different heating rates. An existence of good agreement between determined values of kinetic parameters (Eand A), which were obtained applying different methods under the same heating rate. Functional relationship between changes of kinetic parameters of dehydration and changes of heating rate was established. An existence of compensation effect is accepted and explanation of compensation effect appearance during the hydrogel dehydration is suggested. © 2005 Akadémiai Kiadó, Budapest.
Obradović, N; Labus, N; Srećković, T; Minić, D; Ristić, M M
Synthesis and characterization of zinc titanate nano-crystal powders obtained by mechanical activation Journal Article
In: Science of Sintering, vol. 37, no. 2, pp. 123-129, 2005.
@article{Obradović2005123,
title = {Synthesis and characterization of zinc titanate nano-crystal powders obtained by mechanical activation},
author = {N Obradović and N Labus and T Srećković and D Minić and M M Ristić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33746641804&doi=10.2298%2fSOS0502123O&partnerID=40&md5=cbdaef82a9ea218582a3dc913046d0e6},
doi = {10.2298/SOS0502123O},
year = {2005},
date = {2005-01-01},
journal = {Science of Sintering},
volume = {37},
number = {2},
pages = {123-129},
abstract = {Development of dielectric materials for microwave frequencies is increasing with rapid progress in mobile and satellite communications systems, where zinc titanates have found application due to their semi-conducting and dielectric properties. Mechanical activation by grinding is a well-known method and common part of the powder preparation route in the field of ceramics. The aim of this work is investigation of the influence of experimental conditions for mechanochemical synthesis of zinc orthotitanate. Starting powder mixtures of ZnO and TiO 2 , in the molar ratio that is in accordance with the stoichiometry of zinc titanate spinel type Zn 2 TiO 4 were mechanically activated using a high-energy planetary ball mill. The process of mechanical activation was performed during different time intervals from 0 to 300 minutes. Microstructure characterization was determined by X-ray diffraction analysis and scanning electron microscopy. Also, the specific surface area (SSA) of powders samples was measured by a nitrogen gas sorption analyzer using the BET method. The very first traces of zinc titanate are detectable after only 5 minutes of activation. The most interesting occurrence during the mechanical method of activation is that we have an almost pure phase after 90 minutes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Development of dielectric materials for microwave frequencies is increasing with rapid progress in mobile and satellite communications systems, where zinc titanates have found application due to their semi-conducting and dielectric properties. Mechanical activation by grinding is a well-known method and common part of the powder preparation route in the field of ceramics. The aim of this work is investigation of the influence of experimental conditions for mechanochemical synthesis of zinc orthotitanate. Starting powder mixtures of ZnO and TiO 2 , in the molar ratio that is in accordance with the stoichiometry of zinc titanate spinel type Zn 2 TiO 4 were mechanically activated using a high-energy planetary ball mill. The process of mechanical activation was performed during different time intervals from 0 to 300 minutes. Microstructure characterization was determined by X-ray diffraction analysis and scanning electron microscopy. Also, the specific surface area (SSA) of powders samples was measured by a nitrogen gas sorption analyzer using the BET method. The very first traces of zinc titanate are detectable after only 5 minutes of activation. The most interesting occurrence during the mechanical method of activation is that we have an almost pure phase after 90 minutes.
Mojović, M; Spasojević, I; Vuletić, M; Vučinić, Ž; Bačić, G
An EPR spin-probe and spin-trap study of the free radicals produced by plant plasma membranes Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 2, pp. 177-186, 2005.
@article{Mojović2005177,
title = {An EPR spin-probe and spin-trap study of the free radicals produced by plant plasma membranes},
author = {M Mojović and I Spasojević and M Vuletić and Ž Vučinić and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144441582&doi=10.2298%2fJSC0502177M&partnerID=40&md5=2f12dac6d99a81a7aa36c81912db03b3},
doi = {10.2298/JSC0502177M},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {2},
pages = {177-186},
abstract = {Plant plasma membranes are known to produce superoxide radicals, while the production of hydroxyl radical is thought to occur only in the cell wall. In this work it was demonstrated using combined spin-trap and spin-probe EPR spectroscopic techniques, that plant plasma membranes do produce superoxide and hydroxyl radicals but by kinetically different mechanisms. The results show that superoxide and hydroxyl radicals can be detected by DMPO spin-trap and that the mechanisms and location of their production can be differentiated using the reduction of spin-probes Tempone and 7-DS. It was shown that the mechanism of production of oxygen reactive species is NADH dependent and diphenylene iodonium inhibited. The kinetics of the reduction of Tempone, combined with scavengers or the absence of NADH indicates that hydroxyl radicals are produced by a mechanism independent of that of superoxide production. It was shown that a combination of the spin-probe and spin-trap technique can be used in free radical studies of biological systems, with a number of advantages inherent to them.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Plant plasma membranes are known to produce superoxide radicals, while the production of hydroxyl radical is thought to occur only in the cell wall. In this work it was demonstrated using combined spin-trap and spin-probe EPR spectroscopic techniques, that plant plasma membranes do produce superoxide and hydroxyl radicals but by kinetically different mechanisms. The results show that superoxide and hydroxyl radicals can be detected by DMPO spin-trap and that the mechanisms and location of their production can be differentiated using the reduction of spin-probes Tempone and 7-DS. It was shown that the mechanism of production of oxygen reactive species is NADH dependent and diphenylene iodonium inhibited. The kinetics of the reduction of Tempone, combined with scavengers or the absence of NADH indicates that hydroxyl radicals are produced by a mechanism independent of that of superoxide production. It was shown that a combination of the spin-probe and spin-trap technique can be used in free radical studies of biological systems, with a number of advantages inherent to them.
Minić, D M; Žák, T; Schneeweiss, O; Pizúrová, N; Ristić, M M
Synthesis and properties of Fe-W powder Journal Article
In: Czechoslovak Journal of Physics, vol. 55, no. 7, pp. 823-834, 2005.
@article{Minić2005823,
title = {Synthesis and properties of Fe-W powder},
author = {D M Minić and T Žák and O Schneeweiss and N Pizúrová and M M Ristić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-26044460613&doi=10.1007%2fs10582-005-0084-0&partnerID=40&md5=cc357cf6ee3bb45b9b2fe17b08588943},
doi = {10.1007/s10582-005-0084-0},
year = {2005},
date = {2005-01-01},
journal = {Czechoslovak Journal of Physics},
volume = {55},
number = {7},
pages = {823-834},
abstract = {This paper deals with the study of Fe-W powders, which were prepared by electrolyzing, and their stabilized properties. The synthesized Fe-W powders were studied using X-ray diffraction, thermal analysis, Mossbauer spectroscopy and thermomagnetic measurement. A poor hydrogen absorption occurred. After the heat treatment at 800°C, the amorphous and α-Fe(W) phases were decomposed into prevailing α-Fe with approx. 3 at.% W accompanied by the W(Fe), λ-Fe 2 W, and Fe 2+ in oxide phases.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper deals with the study of Fe-W powders, which were prepared by electrolyzing, and their stabilized properties. The synthesized Fe-W powders were studied using X-ray diffraction, thermal analysis, Mossbauer spectroscopy and thermomagnetic measurement. A poor hydrogen absorption occurred. After the heat treatment at 800°C, the amorphous and α-Fe(W) phases were decomposed into prevailing α-Fe with approx. 3 at.% W accompanied by the W(Fe), λ-Fe 2 W, and Fe 2+ in oxide phases.
Davidović, M; Čajkovski, T; Colomban, Ph.; Mioč, U B; Likar-Smiljanić, V; Čajkovski, D; Biljić, R; Nedić, Z
The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 2881-2885, 2005.
@article{Davidović20052881,
title = {The influence of monovalent and bivalent cations on the electrical properties of 12-Tungstophosphoric acid salts},
author = {M Davidović and T Čajkovski and Ph. Colomban and U B Mioč and V Likar-Smiljanić and D Čajkovski and R Biljić and Z Nedić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944454882&doi=10.1016%2fj.ssi.2005.09.020&partnerID=40&md5=de6beb3f3fc4ef51429806504ebf1a28},
doi = {10.1016/j.ssi.2005.09.020},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {2881-2885},
abstract = {The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH - and various forms of hydrated proton H(H2O) +n. Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some WPA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10- 11 s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some WPA salts with longer relaxation times of the order of 10- 7-10- 5 s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The effect of monovalent and bivalent cations on some electrical properties of 12-tungstophosphoric acid (WPA) salts were studied. The charge carriers in this acid are protonic entities such as H+, OH - and various forms of hydrated proton H(H2O) +n. Conductivity, dielectric relaxations and activation energies of WPA were investigated. Permittivity measurements were performed on pressed polycrystalline pellets at lower frequencies (5 Hz-500 kHz) and in the X-band microwave range (8-12 GHz); the temperature interval was from room temperature to 360 K. In the microwave region, WPA hexahydrate (WPA-6) and some WPA salts exhibit one, two or three relaxations of the Debye type. Their relaxation times of the order of 10- 11 s are attributed to the fast reorientation of water molecules and/or fast reorientation of oxonium ions (H3O+). In the lower frequency interval, dielectric relaxations of WPA-6 and some WPA salts with longer relaxation times of the order of 10- 7-10- 5 s were registered and assigned to ion (H+ and/or H3O+) and cation jumps. © 2005 Elsevier B.V. All rights reserved.
Mioč, U B; Todorović, M R; Davidović, M; Colomban, Ph.; Holclajtner-Antunović, I
Heteropoly compounds - From proton conductors to biomedical agents Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 3005-3017, 2005.
@article{Mioč20053005,
title = {Heteropoly compounds - From proton conductors to biomedical agents},
author = {U B Mioč and M R Todorović and M Davidović and Ph. Colomban and I Holclajtner-Antunović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944433631&doi=10.1016%2fj.ssi.2005.09.056&partnerID=40&md5=fad7bf6f0a877da7d4ef4fd9dd632a4e},
doi = {10.1016/j.ssi.2005.09.056},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {3005-3017},
abstract = {Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Heteropoly compounds (HPCs) have been a matter of interest in basic and applied science for more than a century. From their first synthesis, many advances have been made to promote the use of HPCs in different ways in science and technology. The aim of this article is to review the main structural characteristics of heteropoly compounds of the Keggin type (12-tungstophosphoric, 12-molybdophosphoric, 12-tungstosilicic acids; alkaline and alkaline earth salts of 12-tungstophosphoric acid and gels doped with HPCs) to understand and explain their different activities, such as high proton conductivity, and catalytic, biochemical and biomedical activities. © 2005 Elsevier B.V. All rights reserved.
Stojić, D. Lj.; Cekić, B D; Maksić, A D; Kaninski, M P M; Miljanić, Š S
Intermetallics as cathode materials in the electrolytic hydrogen production Journal Article
In: International Journal of Hydrogen Energy, vol. 30, no. 1, pp. 21-28, 2005.
@article{Stojić200521,
title = {Intermetallics as cathode materials in the electrolytic hydrogen production},
author = {D.Lj. Stojić and B D Cekić and A D Maksić and M P M Kaninski and Š S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-9544226467&doi=10.1016%2fj.ijhydene.2004.05.005&partnerID=40&md5=3ffa56f32436ac2f3a0294553f906354},
doi = {10.1016/j.ijhydene.2004.05.005},
year = {2005},
date = {2005-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {30},
number = {1},
pages = {21-28},
abstract = {The intermetallics of transition metals have been investigated as cathode materials for the production of hydrogen by electrolysis from water-KOH solutions, in an attempt to increase the electrolytic process efficiency. We found that the best effect among all investigated cathodes (Hf 2 Fe, Zr-Pt, Nb-Pd(I), Pd-Ta, Nb-Pd(II), Ti-Pt) exhibits the Hf 2 Fe phase. These materials were compared with conventional cathodes (Fe and Ni), often used in the alkaline electrolysis. A significant upgrade of the electrolytic efficiency using intermetallics, either in pure KOH electrolyte or in combination with ionic activators added in situ, was achieved. The effects of these cathode materials on the process efficiency were discussed in the context of transition metal features that issue from their electronic configuration. © 2004 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The intermetallics of transition metals have been investigated as cathode materials for the production of hydrogen by electrolysis from water-KOH solutions, in an attempt to increase the electrolytic process efficiency. We found that the best effect among all investigated cathodes (Hf 2 Fe, Zr-Pt, Nb-Pd(I), Pd-Ta, Nb-Pd(II), Ti-Pt) exhibits the Hf 2 Fe phase. These materials were compared with conventional cathodes (Fe and Ni), often used in the alkaline electrolysis. A significant upgrade of the electrolytic efficiency using intermetallics, either in pure KOH electrolyte or in combination with ionic activators added in situ, was achieved. The effects of these cathode materials on the process efficiency were discussed in the context of transition metal features that issue from their electronic configuration. © 2004 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Vukojević, V; Pramanik, A; Yakovleva, T; Rigler, R; Terenius, L; Bakalkin, G
Study of molecular events in cells by fluorescence correlation spectroscopy Journal Article
In: Cellular and Molecular Life Sciences, vol. 62, no. 5, pp. 535-550, 2005.
@article{Vukojević2005535,
title = {Study of molecular events in cells by fluorescence correlation spectroscopy},
author = {V Vukojević and A Pramanik and T Yakovleva and R Rigler and L Terenius and G Bakalkin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-15344341160&doi=10.1007%2fs00018-004-4305-7&partnerID=40&md5=63cca218a48eea9de6fa5c1be9fe363f},
doi = {10.1007/s00018-004-4305-7},
year = {2005},
date = {2005-01-01},
journal = {Cellular and Molecular Life Sciences},
volume = {62},
number = {5},
pages = {535-550},
abstract = {To understand processes in a living cell, sophisticated and creative approaches are required that can be used for gathering quantitative information about large number of components interacting across temporal and spatial scales without major disruption of the integral network of processes. A physical method of analysis that can meet these requirements is fluorescence correlation spectroscopy (FCS), which is an ultrasensitive and non-invasive detection method capable of single-molecule and real-time resolution. Since its introduction about 3 decades ago, this until recently emerging technology has reached maturity. As commercially built equipment is now available, FCS is extensively applied for extracting biological information from living cells unattainable by other methods, and new biological concepts are formulated based on findings by FCS. In this review, we focus on examples in the field of molecular cellular biology. The versatility of the technique in this field is illustrated in studies of single-molecule dynamics and conformational flexibility of proteins, and the relevance of conformational flexibility for biological functions regarding the multispecificity of antibodies, modulation of activity of C5a receptors in clathrin-mediated endocytosis and multiplicity of functional responses mediated by the p53 tumor suppressor protein; quantitative characterization of physicochemical properties of the cellular interior; protein trafficking; and ligand-receptor interactions. FCS can also be used to study cell-to-cell communication, here exemplified by clustering of apoptotic cells via bystander killing by hydrogen peroxide. © Birkhäuser Verlag, Basel, 2005.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
To understand processes in a living cell, sophisticated and creative approaches are required that can be used for gathering quantitative information about large number of components interacting across temporal and spatial scales without major disruption of the integral network of processes. A physical method of analysis that can meet these requirements is fluorescence correlation spectroscopy (FCS), which is an ultrasensitive and non-invasive detection method capable of single-molecule and real-time resolution. Since its introduction about 3 decades ago, this until recently emerging technology has reached maturity. As commercially built equipment is now available, FCS is extensively applied for extracting biological information from living cells unattainable by other methods, and new biological concepts are formulated based on findings by FCS. In this review, we focus on examples in the field of molecular cellular biology. The versatility of the technique in this field is illustrated in studies of single-molecule dynamics and conformational flexibility of proteins, and the relevance of conformational flexibility for biological functions regarding the multispecificity of antibodies, modulation of activity of C5a receptors in clathrin-mediated endocytosis and multiplicity of functional responses mediated by the p53 tumor suppressor protein; quantitative characterization of physicochemical properties of the cellular interior; protein trafficking; and ligand-receptor interactions. FCS can also be used to study cell-to-cell communication, here exemplified by clustering of apoptotic cells via bystander killing by hydrogen peroxide. © Birkhäuser Verlag, Basel, 2005.
Popović-Bijelić, A; Bijelić, G; Kolar-Anić, L; Vukojević, V
Numerically simulated pH-induced reactivation of catalytic activity of horseradish peroxidase Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 457-460, 2005.
@article{Popović-Bijelić2005457,
title = {Numerically simulated pH-induced reactivation of catalytic activity of horseradish peroxidase},
author = {A Popović-Bijelić and G Bijelić and L Kolar-Anić and V Vukojević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144516627&doi=10.1196%2fannals.1342.066&partnerID=40&md5=bb99bab1865537e3f20490c77be754c8},
doi = {10.1196/annals.1342.066},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {457-460},
abstract = {A model mechanism that accounts for the experimentally observed pH-dependent enhancement of enzymatic activity of horseradish peroxidase through the catalase-like pathway is proposed. Predictions of the model are tested against a number of experimental results to confirm that kinetic constants used in the numerical simulation are correctly chosen and that the model can be used to emulate the reaction between horseradish peroxidase and hydrogen peroxide in a wide range of conditions. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A model mechanism that accounts for the experimentally observed pH-dependent enhancement of enzymatic activity of horseradish peroxidase through the catalase-like pathway is proposed. Predictions of the model are tested against a number of experimental results to confirm that kinetic constants used in the numerical simulation are correctly chosen and that the model can be used to emulate the reaction between horseradish peroxidase and hydrogen peroxide in a wide range of conditions. © 2005 New York Academy of Sciences.
Jelić, S; Čupić, Z; Kolar-Anić, L
Mathematical modeling of the hypothalamic-pituitary-adrenal system activity Journal Article
In: Mathematical Biosciences, vol. 197, no. 2, pp. 173-187, 2005.
@article{Jelić2005173,
title = {Mathematical modeling of the hypothalamic-pituitary-adrenal system activity},
author = {S Jelić and Z Čupić and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25844487749&doi=10.1016%2fj.mbs.2005.06.006&partnerID=40&md5=1910008e83b56d79d1f0a962264e7d90},
doi = {10.1016/j.mbs.2005.06.006},
year = {2005},
date = {2005-01-01},
journal = {Mathematical Biosciences},
volume = {197},
number = {2},
pages = {173-187},
abstract = {Mathematical modeling has proven to be valuable in understanding of the complex biological systems dynamics. In the present report we have developed an initial model of the hypothalamic-pituitary-adrenal system self-regulatory activity. A four-dimensional non-linear differential equation model of the hormone secretion was formulated and used to analyze plasma cortisol levels in humans. The aim of this work was to explore in greater detail the role of this system in normal, homeostatic, conditions, since it is the first and unavoidable step in further understanding of the role of this complex neuroendocrine system in pathophysiological conditions. Neither the underlying mechanisms nor the physiological significance of this system are fully understood yet. © 2005 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Mathematical modeling has proven to be valuable in understanding of the complex biological systems dynamics. In the present report we have developed an initial model of the hypothalamic-pituitary-adrenal system self-regulatory activity. A four-dimensional non-linear differential equation model of the hormone secretion was formulated and used to analyze plasma cortisol levels in humans. The aim of this work was to explore in greater detail the role of this system in normal, homeostatic, conditions, since it is the first and unavoidable step in further understanding of the role of this complex neuroendocrine system in pathophysiological conditions. Neither the underlying mechanisms nor the physiological significance of this system are fully understood yet. © 2005 Elsevier Inc. All rights reserved.
2004
Mladenović, M; Perić, M; Engels, B
An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 Π electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 121, no. 24, pp. 12361-12370, 2004.
@article{Mladenović200412361,
title = {An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 Π electronic state of CCCH},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844439422&doi=10.1063%2f1.1818680&partnerID=40&md5=26c5d4911a0b1a5dd15640fe2ecbbac5},
doi = {10.1063/1.1818680},
year = {2004},
date = {2004-01-01},
journal = {Journal of Chemical Physics},
volume = {121},
number = {24},
pages = {12361-12370},
abstract = {The results of ab initio calculations of the vibronically averaged components of the anisotropic magnetic hyperfine tensor in the low-lying vibronic species of the X 2 Π electronic state of CCCH and CCCD are reported. The electronically averaged hyperfine coupling constants for hydrogen and 13 C in 12 C 12 C 12 CH, 13 C 12 C 12 CH, 12 C 13 C 12 CH, 12 C 12 C 13 CH, and 12 C 12 C 12 CD are obtained as functions of two bending vibrational modes by the density functional theory method. The vibronic wave functions are calculated with help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. The results of the present study help to reliably interpret the experimental data previously published and predict the yet unobserved hyperfine structure in excited vibronic states of CCCH and CCCD. © 2004 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of ab initio calculations of the vibronically averaged components of the anisotropic magnetic hyperfine tensor in the low-lying vibronic species of the X 2 Π electronic state of CCCH and CCCD are reported. The electronically averaged hyperfine coupling constants for hydrogen and 13 C in 12 C 12 C 12 CH, 13 C 12 C 12 CH, 12 C 13 C 12 CH, 12 C 12 C 13 CH, and 12 C 12 C 12 CD are obtained as functions of two bending vibrational modes by the density functional theory method. The vibronic wave functions are calculated with help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. The results of the present study help to reliably interpret the experimental data previously published and predict the yet unobserved hyperfine structure in excited vibronic states of CCCH and CCCD. © 2004 American Institute of Physics.
Mladenović, M; Perić, M; Jerosimić, S; Engels, B
Ab initia study of the hyperfine structure of the X 2 π electronic state of HCCS Journal Article
In: Molecular Physics, vol. 102, no. 23-24, pp. 2623-2634, 2004.
@article{Mladenović20042623,
title = {Ab initia study of the hyperfine structure of the X 2 π electronic state of HCCS},
author = {M Mladenović and M Perić and S Jerosimić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-10944232599&doi=10.1080%2f00268970412331292876&partnerID=40&md5=ccfad4589c060a2b61f6210f5856ba7c},
doi = {10.1080/00268970412331292876},
year = {2004},
date = {2004-01-01},
journal = {Molecular Physics},
volume = {102},
number = {23-24},
pages = {2623-2634},
abstract = {The results of an ab initio study of the magnetic hyperfine structure of the X 2 π electronic state of HCCS and DCCS are reported. The potential surfaces for two components of the X 2 π electronic state and the electronically averaged hyperfine coupling constants for H, D, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. Since the bending potential curves calculated in the present study do not differ significantly from their counterparts computed in our previous work by means of an extensive configuration interaction approach, we employ the latter here to avoid the appearance of small differences between the vibronic energy levels presented in this work and those already published. The vibronic wave functions are calculated with the help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. It is found that, due to the generally significant geometry dependence of the hyperfine coupling constants, it is necessary to carry out vibronic averaging of the corresponding functions in order to obtain values which can be compared with the results of measurements. The results of the present study are an aid to the reliable interpretation of recently published experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of an ab initio study of the magnetic hyperfine structure of the X 2 π electronic state of HCCS and DCCS are reported. The potential surfaces for two components of the X 2 π electronic state and the electronically averaged hyperfine coupling constants for H, D, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. Since the bending potential curves calculated in the present study do not differ significantly from their counterparts computed in our previous work by means of an extensive configuration interaction approach, we employ the latter here to avoid the appearance of small differences between the vibronic energy levels presented in this work and those already published. The vibronic wave functions are calculated with the help of a variational approach which takes into account the Renner-Teller effect and spin-orbit coupling. It is found that, due to the generally significant geometry dependence of the hyperfine coupling constants, it is necessary to carry out vibronic averaging of the corresponding functions in order to obtain values which can be compared with the results of measurements. The results of the present study are an aid to the reliable interpretation of recently published experimental data.
Rakić, V; Dondur, V; Gajinov, S; Auroux, A
Calorimetric study of room temperature adsorption of N 2 O and CO on Cu(II)-exchanged ZSM5 zeolites Journal Article
In: Thermochimica Acta, vol. 420, no. 1-2 SPEC. ISS., pp. 51-57, 2004.
@article{Rakić200451,
title = {Calorimetric study of room temperature adsorption of N 2 O and CO on Cu(II)-exchanged ZSM5 zeolites},
author = {V Rakić and V Dondur and S Gajinov and A Auroux},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4644301705&doi=10.1016%2fj.tca.2003.12.030&partnerID=40&md5=d05ebb2b05dd31e0654ae4a654ecaeff},
doi = {10.1016/j.tca.2003.12.030},
year = {2004},
date = {2004-01-01},
journal = {Thermochimica Acta},
volume = {420},
number = {1-2 SPEC. ISS.},
pages = {51-57},
abstract = {Copper ion-exchanged ZSM5 zeolites have been prepared with different cooper loadings from under- to over-exchanged levels. The adsorptions of N 2 O and CO at 303 K have been studied using calorimetric method and infrared spectroscopy. The samples were additionally characterised by ammonia adsorption at 423 K. The active sites for both N 2 O and CO are Cu(I) ions, which were formed as a result of pre-treatment in vacuum at 673 K. Room temperature adsorption of nitrous oxide at low equilibrium pressures (up to 66.7 Pa) resulted in small amounts of chemisorbed N 2 O (<0.2 molecule per one Cu ion). Differential heats of N 2 O adsorption between 80 and 30 kJ/mol were obtained. Differential heats of CO adsorption between 140 and 40 kJ/mol were obtained. The obtained amounts of chemisorbed species in the investigated systems and the values of differential heats of both nitrous oxide and carbon monoxide demonstrate the dependence on the copper content. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copper ion-exchanged ZSM5 zeolites have been prepared with different cooper loadings from under- to over-exchanged levels. The adsorptions of N 2 O and CO at 303 K have been studied using calorimetric method and infrared spectroscopy. The samples were additionally characterised by ammonia adsorption at 423 K. The active sites for both N 2 O and CO are Cu(I) ions, which were formed as a result of pre-treatment in vacuum at 673 K. Room temperature adsorption of nitrous oxide at low equilibrium pressures (up to 66.7 Pa) resulted in small amounts of chemisorbed N 2 O (<0.2 molecule per one Cu ion). Differential heats of N 2 O adsorption between 80 and 30 kJ/mol were obtained. Differential heats of CO adsorption between 140 and 40 kJ/mol were obtained. The obtained amounts of chemisorbed species in the investigated systems and the values of differential heats of both nitrous oxide and carbon monoxide demonstrate the dependence on the copper content. © 2004 Elsevier B.V. All rights reserved.
Korićanac, Z; Jovanović, T; Petković, J; Minić, D
Spectrophotometric investigation of famotidine-Pd(II) complex and its analytical application in drug analysis Journal Article
In: Journal of the Serbian Chemical Society, vol. 69, no. 6, pp. 485-491, 2004.
@article{Korićanac2004485,
title = {Spectrophotometric investigation of famotidine-Pd(II) complex and its analytical application in drug analysis},
author = {Z Korićanac and T Jovanović and J Petković and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4143116689&doi=10.2298%2fJSC0406485K&partnerID=40&md5=9186a978edcdefb5d7fd3ea1e8caa8c4},
doi = {10.2298/JSC0406485K},
year = {2004},
date = {2004-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {69},
number = {6},
pages = {485-491},
abstract = {By using different spectrophotometric methods, it was found that famotidine and palladium(II) ions form a complex, Pd(II): famotidine = 1:1. which has an absorption maximum at 345 nm. The formation of the complex between famotidine and palladium(II) chloride in Britton-Robinson buffer solution in the pH range 2.23-8.50 was studied. The conditional stability constant of the complex at the optimum pH 2.62 and ionic strength 0.5 M was found to be log K′ = 3.742 ± 0.025. The Beer's law was verified over the famotidine concentration range from 5 × 10-5 - 6 × 10-4 M. The proposed method was found to be suitable for accurate and sensitive analysis of famotidine both as the substance (RSD = 1.02-1.80%) and its dosage forms (RSD = 1.75-1.83%).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By using different spectrophotometric methods, it was found that famotidine and palladium(II) ions form a complex, Pd(II): famotidine = 1:1. which has an absorption maximum at 345 nm. The formation of the complex between famotidine and palladium(II) chloride in Britton-Robinson buffer solution in the pH range 2.23-8.50 was studied. The conditional stability constant of the complex at the optimum pH 2.62 and ionic strength 0.5 M was found to be log K′ = 3.742 ± 0.025. The Beer's law was verified over the famotidine concentration range from 5 × 10-5 - 6 × 10-4 M. The proposed method was found to be suitable for accurate and sensitive analysis of famotidine both as the substance (RSD = 1.02-1.80%) and its dosage forms (RSD = 1.75-1.83%).
Perić, M; Mladenović, M; Engels, B
An ab initio study of the hyperfine structure in the X 2 ∏ electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 121, no. 6, pp. 2636-2645, 2004.
@article{Perić20042636,
title = {An ab initio study of the hyperfine structure in the X 2 ∏ electronic state of CCCH},
author = {M Perić and M Mladenović and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4344579083&doi=10.1063%2f1.1768162&partnerID=40&md5=e6db8a52890cd4f3b5d91b31cb691d86},
doi = {10.1063/1.1768162},
year = {2004},
date = {2004-01-01},
journal = {Journal of Chemical Physics},
volume = {121},
number = {6},
pages = {2636-2645},
abstract = {The ab initio study of the magnetic hyperfine structure in the X 2 II electronic state of CCCH are reported. An extensive configuration interaction approach was used to compute the potential surfaces for the two components of the X 2 II electronic state.The vibronic wave functions were calculated with the help of a variational approach with Renner-Teller effect and spin-orbit coupling. It was found that, due to strong geometry dependence of the hyperfine coupling constraints, vibronic averaging of the corresponding functions was carried out to obtain the values to compare with the results of the measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The ab initio study of the magnetic hyperfine structure in the X 2 II electronic state of CCCH are reported. An extensive configuration interaction approach was used to compute the potential surfaces for the two components of the X 2 II electronic state.The vibronic wave functions were calculated with the help of a variational approach with Renner-Teller effect and spin-orbit coupling. It was found that, due to strong geometry dependence of the hyperfine coupling constraints, vibronic averaging of the corresponding functions was carried out to obtain the values to compare with the results of the measurements.
Perić, M; Mladenović, M; Engels, B
An ab initio study of the vibronic, spin-orbit and hyperfine coupling in the X2Π electronic state of the CCCD radical Journal Article
In: Chemical Physics Letters, vol. 393, no. 4-6, pp. 552-557, 2004.
@article{Perić2004552,
title = {An ab initio study of the vibronic, spin-orbit and hyperfine coupling in the X2Π electronic state of the CCCD radical},
author = {M Perić and M Mladenović and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-3242891793&doi=10.1016%2fj.cplett.2004.06.097&partnerID=40&md5=4545a229d7b687d993514f06132f3086},
doi = {10.1016/j.cplett.2004.06.097},
year = {2004},
date = {2004-01-01},
journal = {Chemical Physics Letters},
volume = {393},
number = {4-6},
pages = {552-557},
abstract = {The results of an ab initio study of the vibronic, spin-orbit and magnetic hyperfine structure in the X2Π electronic state for the various isotopomers of the CCCD radical are reported. The bending vibronic energy levels and their splitting due to the spin-orbit coupling are calculated by means of a variational approach. The electronically averaged hyperfine coupling constants of D and 13C are obtained as functions of two bending vibrational modes by the density functional theory method. The results of this study help to reliably interpret the available experimental data and predict yet unobserved features in the ground and excited vibronic states. © 2004 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The results of an ab initio study of the vibronic, spin-orbit and magnetic hyperfine structure in the X2Π electronic state for the various isotopomers of the CCCD radical are reported. The bending vibronic energy levels and their splitting due to the spin-orbit coupling are calculated by means of a variational approach. The electronically averaged hyperfine coupling constants of D and 13C are obtained as functions of two bending vibrational modes by the density functional theory method. The results of this study help to reliably interpret the available experimental data and predict yet unobserved features in the ground and excited vibronic states. © 2004 Elsevier B.V.
Yakovleva, T; Kolesnikova, L; Vukojević, V; Gileva, I; Tan-No, K; Austen, M; Lüscher, B; Ekström, T J; Terenius, L; Bakalkin, G
YY1 binding to a subset of p53 DNA-target sites regulates p53-dependent transcription Journal Article
In: Biochemical and Biophysical Research Communications, vol. 318, no. 2, pp. 615-624, 2004.
@article{Yakovleva2004615,
title = {YY1 binding to a subset of p53 DNA-target sites regulates p53-dependent transcription},
author = {T Yakovleva and L Kolesnikova and V Vukojević and I Gileva and K Tan-No and M Austen and B Lüscher and T J Ekström and L Terenius and G Bakalkin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2342418830&doi=10.1016%2fj.bbrc.2004.04.065&partnerID=40&md5=fab449c508b944a2d0ca79f45d40a20e},
doi = {10.1016/j.bbrc.2004.04.065},
year = {2004},
date = {2004-01-01},
journal = {Biochemical and Biophysical Research Communications},
volume = {318},
number = {2},
pages = {615-624},
abstract = {The tumor suppressor protein p53 regulates gene transcription through binding to specific DNA-target sites. We here demonstrate that a subset of these sites is targeted by another DNA-binding factor. Binding specificity, reactivity with specific antibodies, and experiments with purified protein identified the factor as the multifunctional transcription regulator YY1. The YY1 core binding sequence ACAT is present in the center of p53-half-binding sites in the p21 and GADD45 genes regulating growth arrest and DNA repair, respectively, but is absent in those of the Bax gene critical for apoptosis. In transfection experiments YY1 inhibits p53-activated transcription from the p53-binding site that contains the ACAT sequence. YY1 and p53 are colocalized around the nucleoli and in discrete nuclear domains in PC12 cells undergoing apoptosis. YY1 might attenuate p53-dependent transcription from a subset of p53-target genes and this may be relevant for directing cells either to growth arrest or apoptosis upon p53 activation. © 2004 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The tumor suppressor protein p53 regulates gene transcription through binding to specific DNA-target sites. We here demonstrate that a subset of these sites is targeted by another DNA-binding factor. Binding specificity, reactivity with specific antibodies, and experiments with purified protein identified the factor as the multifunctional transcription regulator YY1. The YY1 core binding sequence ACAT is present in the center of p53-half-binding sites in the p21 and GADD45 genes regulating growth arrest and DNA repair, respectively, but is absent in those of the Bax gene critical for apoptosis. In transfection experiments YY1 inhibits p53-activated transcription from the p53-binding site that contains the ACAT sequence. YY1 and p53 are colocalized around the nucleoli and in discrete nuclear domains in PC12 cells undergoing apoptosis. YY1 might attenuate p53-dependent transcription from a subset of p53-target genes and this may be relevant for directing cells either to growth arrest or apoptosis upon p53 activation. © 2004 Elsevier Inc. All rights reserved.