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FFH scientific research papers database
FFH database search (1991-2022):
1401.
Bojovic, V; Antić-Jovanović, A; Kuzmanović, M
High-resolution spectra of the10B18O and 11B18O: Rotational analysis of the B-X bands Journal Article
In: Chinese Physics Letters, vol. 22, no. 4, pp. 857-860, 2005.
@article{Bojovic2005857,
title = {High-resolution spectra of the10B18O and 11B18O: Rotational analysis of the B-X bands},
author = {V Bojovic and A Antić-Jovanović and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24144463908&doi=10.1088%2f0256-307X%2f22%2f4%2f022&partnerID=40&md5=bc7019ffb0c50aa16e94ede010431d07},
doi = {10.1088/0256-307X/22/4/022},
year = {2005},
date = {2005-01-01},
journal = {Chinese Physics Letters},
volume = {22},
number = {4},
pages = {857-860},
abstract = {Emission spectra of 10B18O and 11B 18O isotopomers in the 230-330nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants B e, and D e for both isotope species 10B 18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (v + 1/2), the value of equilibrium distance re in the lower state has been derived. © 2005 Chinese Physical Society and IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Emission spectra of 10B18O and 11B 18O isotopomers in the 230-330nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants B e, and D e for both isotope species 10B 18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (v + 1/2), the value of equilibrium distance re in the lower state has been derived. © 2005 Chinese Physical Society and IOP Publishing Ltd.
1402.
Dragović, S; Onjia, A; Stanković, S; Aničin, I; Bačić, G
Artificial neural network modelling of uncertainty in gamma-ray spectrometry Journal Article
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 540, no. 2-3, pp. 455-463, 2005.
@article{Dragović2005455,
title = {Artificial neural network modelling of uncertainty in gamma-ray spectrometry},
author = {S Dragović and A Onjia and S Stanković and I Aničin and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-17844383973&doi=10.1016%2fj.nima.2004.11.045&partnerID=40&md5=3af7c121d71adb4539ed072b182dff1c},
doi = {10.1016/j.nima.2004.11.045},
year = {2005},
date = {2005-01-01},
journal = {Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
volume = {540},
number = {2-3},
pages = {455-463},
abstract = {An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides ( 226 Ra, 238 U, 235 U, 40 K, 232 Th, 134 Cs, 137 Cs and 7 Be) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium ( 238 U/ 232 Th) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the 238 U/ 232 Th ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides ( 226 Ra, 238 U, 235 U, 40 K, 232 Th, 134 Cs, 137 Cs and 7 Be) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium ( 238 U/ 232 Th) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the 238 U/ 232 Th ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy. © 2004 Elsevier B.V. All rights reserved.
1403.
Marković, J M Dimitrić; Petranović, N A; Baranac, J M
The copigmentation effect of sinapic acid on malvin: A spectroscopic investigation on colour enhancement Journal Article
In: Journal of Photochemistry and Photobiology B: Biology, vol. 78, no. 3, pp. 223-228, 2005.
@article{DimitrićMarković2005223,
title = {The copigmentation effect of sinapic acid on malvin: A spectroscopic investigation on colour enhancement},
author = {J M Dimitrić Marković and N A Petranović and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-13544249909&doi=10.1016%2fj.jphotobiol.2004.11.009&partnerID=40&md5=19f599436511feea97fad622e46e5cb8},
doi = {10.1016/j.jphotobiol.2004.11.009},
year = {2005},
date = {2005-01-01},
journal = {Journal of Photochemistry and Photobiology B: Biology},
volume = {78},
number = {3},
pages = {223-228},
abstract = {The present paper reports on spectroscopic investigation of copigmentation effect of sinapic acid on the malvin molecule. A reaction of copigmentation was investigated by the use of UV-Vis absorption spectra in the whole range of acidic and moderately acidic buffered aqueous solutions (pH range 1.0-6.0). It was observed that the ratio (A - A0)/A0, as a good measure of the copigment effect, has its maximum value at pH 3.6. The influences of the pH of the meduim, molecular concentration, and temperature were investigated. The reaction was thermo-dynamically defined in terms of ΔH0, ΔG0 and ΔS0 values. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present paper reports on spectroscopic investigation of copigmentation effect of sinapic acid on the malvin molecule. A reaction of copigmentation was investigated by the use of UV-Vis absorption spectra in the whole range of acidic and moderately acidic buffered aqueous solutions (pH range 1.0-6.0). It was observed that the ratio (A - A0)/A0, as a good measure of the copigment effect, has its maximum value at pH 3.6. The influences of the pH of the meduim, molecular concentration, and temperature were investigated. The reaction was thermo-dynamically defined in terms of ΔH0, ΔG0 and ΔS0 values. © 2004 Elsevier B.V. All rights reserved.
1404.
Mladenović, M; Perić, M; Ranković, R; Engels, B
In: Molecular Physics, vol. 103, no. 4, pp. 587-598, 2005.
@article{Mladenović2005587,
title = {An ab initio study of the hyperfine structure in the X 2 Π electronic state of HCCS-calculation of vibronically averaged components of the anizotropic hyperfine tensor},
author = {M Mladenović and M Perić and R Ranković and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27944506748&doi=10.1080%2f00268970412331332097&partnerID=40&md5=fb96b3f71f42157d445ec4f6f6c1acc0},
doi = {10.1080/00268970412331332097},
year = {2005},
date = {2005-01-01},
journal = {Molecular Physics},
volume = {103},
number = {4},
pages = {587-598},
abstract = {Theresults 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 the HCCS radical are reported. The electronically averaged hyperfine coupling constants for hydrogen, deuterium, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. 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. The results of ab initio calculations are compared to the corresponding experimental findings. © 2005 Taylor & Francis Group Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Theresults 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 the HCCS radical are reported. The electronically averaged hyperfine coupling constants for hydrogen, deuterium, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. 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. The results of ab initio calculations are compared to the corresponding experimental findings. © 2005 Taylor & Francis Group Ltd.
1405.
Marković, J M Dimitrić; Baranac, J M; Brdarić, T P
Electronic and infrared vibrational analysis of cyanidin-quercetin copigment complex Journal Article
In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol. 62, no. 1-3, pp. 673-680, 2005.
@article{DimitrićMarković2005673,
title = {Electronic and infrared vibrational analysis of cyanidin-quercetin copigment complex},
author = {J M Dimitrić Marković and J M Baranac and T P Brdarić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27644593802&doi=10.1016%2fj.saa.2005.02.036&partnerID=40&md5=ca15529809b6bbe40b6e82527fb64313},
doi = {10.1016/j.saa.2005.02.036},
year = {2005},
date = {2005-01-01},
journal = {Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy},
volume = {62},
number = {1-3},
pages = {673-680},
abstract = {Copigment complex formation between cyanidin and quercetin, in aqueous buffered solutions, was studied by electronic absorption and infrared vibrational spectroscopies. It was found that the association of cyanidin with quercetin occurred at pH 3.0 and pH 5.0 including cyanidin flavylium ion and anhydrobase transformation forms, respectively. Obtained copigmentation constant values of K = 2726.7 (pH 3.0) and K = 1093.1 (pH 5.0) indicated good association ability of the investigated molecules. Infrared spectra revealed the existence of hydrogen bonds in the copigment complexes structures. The analysis of the deconvoluted infrared spectra indicated several types of hydrogen bonds, differently formed: the HO⋯H bonds with the corresponding bands around 3500 cm -1 and bonds formed via H 3 O + , oxonium, ion of the molecules with the corresponding bands below 3000 cm -1 . © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copigment complex formation between cyanidin and quercetin, in aqueous buffered solutions, was studied by electronic absorption and infrared vibrational spectroscopies. It was found that the association of cyanidin with quercetin occurred at pH 3.0 and pH 5.0 including cyanidin flavylium ion and anhydrobase transformation forms, respectively. Obtained copigmentation constant values of K = 2726.7 (pH 3.0) and K = 1093.1 (pH 5.0) indicated good association ability of the investigated molecules. Infrared spectra revealed the existence of hydrogen bonds in the copigment complexes structures. The analysis of the deconvoluted infrared spectra indicated several types of hydrogen bonds, differently formed: the HO⋯H bonds with the corresponding bands around 3500 cm -1 and bonds formed via H 3 O + , oxonium, ion of the molecules with the corresponding bands below 3000 cm -1 . © 2005 Elsevier B.V. All rights reserved.
1406.
Bačić, G; Mojović, M
EPR spin trapping of oxygen radicals in plants: A methodological overview Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 230-243, 2005.
@article{Bačić2005230,
title = {EPR spin trapping of oxygen radicals in plants: A methodological overview},
author = {G Bačić and M Mojović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144448116&doi=10.1196%2fannals.1342.021&partnerID=40&md5=9546b82c7ac3c70df190c2a11beaa8cb},
doi = {10.1196/annals.1342.021},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {230-243},
abstract = {We present a brief account of the difficulties involved in detection of oxygen free radicals in plants and give a rationale for using the EPR spin trapping technique in such studies. Comparative analysis of characteristics of different spin traps is given, having in mind their suitability in trapping oxygen-centered free radicals. Certain technical aspects of EPR experiments related to successful trapping of free radicals are discussed. Previous studies of trapping of oxygen radicals in plants are reviewed in terms of how efficient the experimental approach employed has been in their detection and how this influences conclusions about the mechanisms of their production. In addition, we analyze the potential of spin labels in the analysis of free radical production in plants and demonstrate that the combination of EPR spin traps and spin labels is extremely efficient for this purpose. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a brief account of the difficulties involved in detection of oxygen free radicals in plants and give a rationale for using the EPR spin trapping technique in such studies. Comparative analysis of characteristics of different spin traps is given, having in mind their suitability in trapping oxygen-centered free radicals. Certain technical aspects of EPR experiments related to successful trapping of free radicals are discussed. Previous studies of trapping of oxygen radicals in plants are reviewed in terms of how efficient the experimental approach employed has been in their detection and how this influences conclusions about the mechanisms of their production. In addition, we analyze the potential of spin labels in the analysis of free radical production in plants and demonstrate that the combination of EPR spin traps and spin labels is extremely efficient for this purpose. © 2005 New York Academy of Sciences.
1407.
Radić-Perić, J; Dašić, A
Thermodynamic study of decomposition of dichlorodifluoromethane in thermal plasma Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 79, no. 1, pp. 59-64, 2005.
@article{Radić-Perić200559,
title = {Thermodynamic study of decomposition of dichlorodifluoromethane in thermal plasma},
author = {J Radić-Perić and A Dašić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-18244402165&doi=10.1007%2fs10973-004-0562-9&partnerID=40&md5=607bc9aa525fd4e410c317fdbede88f4},
doi = {10.1007/s10973-004-0562-9},
year = {2005},
date = {2005-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {79},
number = {1},
pages = {59-64},
abstract = {Decomposition of dichlorodifluoromethane in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving carbon, chlorine and fluorine in presence of argon (which is assumed to be the main plasma gas) and/or in addition of hydrogen and calcium together with hydrogen. The calculations were carried out for the temperature range between 500 and 6000 K and for the total pressure of the system of 1 bar. Use is made of the fact that a thermal plasma is a plasma in (local) thermal equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state. The results of calculations show that toxic molecules and radicals can be, under convenient conditions (appropriate temperature and amount of added substances), converted into stable non-toxic species like CaF2 and CaCl2. © 2005 Akadémiai Kladó, Budapest.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Decomposition of dichlorodifluoromethane in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving carbon, chlorine and fluorine in presence of argon (which is assumed to be the main plasma gas) and/or in addition of hydrogen and calcium together with hydrogen. The calculations were carried out for the temperature range between 500 and 6000 K and for the total pressure of the system of 1 bar. Use is made of the fact that a thermal plasma is a plasma in (local) thermal equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state. The results of calculations show that toxic molecules and radicals can be, under convenient conditions (appropriate temperature and amount of added substances), converted into stable non-toxic species like CaF2 and CaCl2. © 2005 Akadémiai Kladó, Budapest.
1408.
Spasojević, I; Zakrzewska, J; Bačić, G G
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 311-320, 2005.
@article{Spasojević2005311,
title = {31P NMR spectroscopy and polarographic combined study of erythrocytes treated with 5-fluorouracil: Cardiotoxicity-related changes in ATP,2,3-BPG, and O2 metabolism},
author = {I Spasojević and J Zakrzewska and G G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144480370&doi=10.1196%2fannals.1342.028&partnerID=40&md5=92b5d7732e5f6d142270b6c904dcc5d8},
doi = {10.1196/annals.1342.028},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {311-320},
abstract = {Antineoplastic drug 5-fluorouracil (5-FU) frequently shows cardiotoxic effects, the mechanism of which has not yet been elucidated. The objective of the present study was to explore effects of 5-FU on metabolism of ATP,2,3-BPG, and oxygen in erythrocytes and to relate these to the phenomenon of 5-FU cardiotoxicity. We determined that 5-FU induced rapid increase in O2 consumption, which led to drastic changes in the metabolism of phosphate compounds in erythrocytes. Decrease in pO2 provoked increase in production of 2,3-BPG and subsequent deoxygenation of oxyHb to deoxyHb. However, the most important effect of 5-FU on erythrocytes is severe decrease in the level of ATP. This could lead to a number of irreversible changes in erythrocyte structure and functioning, such as echinocytosis, increase in membrane fluidity, and non-functioning of membrane ion pumps. All these changes affect normal functioning of erythrocytes, leading to difficulties in oxygen transport and insufficient supply of oxygen to the heart, and pointing to the importance of studying the effects of antineoplastic drugs on intracellular metabolism of erythrocytes. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Antineoplastic drug 5-fluorouracil (5-FU) frequently shows cardiotoxic effects, the mechanism of which has not yet been elucidated. The objective of the present study was to explore effects of 5-FU on metabolism of ATP,2,3-BPG, and oxygen in erythrocytes and to relate these to the phenomenon of 5-FU cardiotoxicity. We determined that 5-FU induced rapid increase in O2 consumption, which led to drastic changes in the metabolism of phosphate compounds in erythrocytes. Decrease in pO2 provoked increase in production of 2,3-BPG and subsequent deoxygenation of oxyHb to deoxyHb. However, the most important effect of 5-FU on erythrocytes is severe decrease in the level of ATP. This could lead to a number of irreversible changes in erythrocyte structure and functioning, such as echinocytosis, increase in membrane fluidity, and non-functioning of membrane ion pumps. All these changes affect normal functioning of erythrocytes, leading to difficulties in oxygen transport and insufficient supply of oxygen to the heart, and pointing to the importance of studying the effects of antineoplastic drugs on intracellular metabolism of erythrocytes. © 2005 New York Academy of Sciences.
1409.
Pejić, N; Blagojević, S; Anić, S; Vukojević, V; Kolar-Anić, L
Microquantitative determination of hesperidin by pulse perturbation of the oscillatory reaction system Journal Article
In: Analytical and Bioanalytical Chemistry, vol. 381, no. 3, pp. 775-780, 2005.
@article{Pejić2005775,
title = {Microquantitative determination of hesperidin by pulse perturbation of the oscillatory reaction system},
author = {N Pejić and S Blagojević and S Anić and V Vukojević and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-15044364234&doi=10.1007%2fs00216-004-2913-6&partnerID=40&md5=0b824e79a4daaa870b02ca93253fd43f},
doi = {10.1007/s00216-004-2913-6},
year = {2005},
date = {2005-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {381},
number = {3},
pages = {775-780},
abstract = {A simple and reliable kinetic method for the determination of hesperidin (Hesp) is developed. It is based on potentiometric monitoring of the concentration perturbations of the matrix reaction system which is in a stable non-equilibrium stationary state close to the bifurcation point. The Bray-Liebhafsky oscillatory reaction is used as the matrix system. The response of the matrix to perturbations by different concentrations of Hesp is followed by using a Pt electrode. A linear relationship between maximal potential shift and the logarithm of Hesp concentrations is obtained between 7.5 and 599.4 μg mL -1 . The limit of detection is 0.65 μg mL -1 . The described procedure has been successfully applied to the determination of Hesp from different sources (capsules, industrial and hand-squeezed orange juice, and white wine). © Springer-Verlag 2005.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A simple and reliable kinetic method for the determination of hesperidin (Hesp) is developed. It is based on potentiometric monitoring of the concentration perturbations of the matrix reaction system which is in a stable non-equilibrium stationary state close to the bifurcation point. The Bray-Liebhafsky oscillatory reaction is used as the matrix system. The response of the matrix to perturbations by different concentrations of Hesp is followed by using a Pt electrode. A linear relationship between maximal potential shift and the logarithm of Hesp concentrations is obtained between 7.5 and 599.4 μg mL -1 . The limit of detection is 0.65 μg mL -1 . The described procedure has been successfully applied to the determination of Hesp from different sources (capsules, industrial and hand-squeezed orange juice, and white wine). © Springer-Verlag 2005.
1410.
Mojović, M; Spasojević, I; Bačić, G
Detection of hydrogen atom adduct of spin-trap DEPMPO. The relevance for studies of biological systems Journal Article
In: Journal of Chemical Information and Modeling, vol. 45, no. 6, pp. 1716-1718, 2005.
@article{Mojović20051716,
title = {Detection of hydrogen atom adduct of spin-trap DEPMPO. The relevance for studies of biological systems},
author = {M Mojović and I Spasojević and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944439903&doi=10.1021%2fci050173d&partnerID=40&md5=ad8614aa10785184910cfbae82e481df},
doi = {10.1021/ci050173d},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Information and Modeling},
volume = {45},
number = {6},
pages = {1716-1718},
abstract = {We proposed EPR spectroscopy using spin-trap DEPMPO as a novel method for the detection of a hydrogen atom (*H) produced by chemical and biological systems. In complex EPR spectra of DEPMPO adducts in biological systems, spectral lines of unknown origin have been observed. We have assumed (Bačič, G.; Mojović, M. Ann. N. Y. Acad. Sci. 2005, 1048, 230-243) that those lines represent the spectrum of a hydrogen atom (*H) adduct i.e., DEPMPO/H. An electrochemical system known to produce only *H radicals was used here in order to obtain a separate spectrum of the DEPMPO/H adduct. An acquired spectrum as well as a computer spectral simulation of the DEPMPO/H adduct showed considerable resemblance with additional lines in the EPR spectra of DEPMPO adducts in biological systems-plant plasma membranes and cell walls. This shows that such a radical is produced by plants as well as that DEPMPO is suitable for detection in both electrochemical and biological systems. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We proposed EPR spectroscopy using spin-trap DEPMPO as a novel method for the detection of a hydrogen atom (*H) produced by chemical and biological systems. In complex EPR spectra of DEPMPO adducts in biological systems, spectral lines of unknown origin have been observed. We have assumed (Bačič, G.; Mojović, M. Ann. N. Y. Acad. Sci. 2005, 1048, 230-243) that those lines represent the spectrum of a hydrogen atom (*H) adduct i.e., DEPMPO/H. An electrochemical system known to produce only *H radicals was used here in order to obtain a separate spectrum of the DEPMPO/H adduct. An acquired spectrum as well as a computer spectral simulation of the DEPMPO/H adduct showed considerable resemblance with additional lines in the EPR spectra of DEPMPO adducts in biological systems-plant plasma membranes and cell walls. This shows that such a radical is produced by plants as well as that DEPMPO is suitable for detection in both electrochemical and biological systems. © 2005 American Chemical Society.
1411.
Kuzmanović, M; Antić-Jovanović, A; Pešić, D; Bojović, V
Franck-Condon factors and r-centroids for the B-X bands of 10 B 18 O and 11 B 18 O molecules Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 5, pp. 727-733, 2005.
@article{Kuzmanović2005727,
title = {Franck-Condon factors and r-centroids for the B-X bands of 10 B 18 O and 11 B 18 O molecules},
author = {M Kuzmanović and A Antić-Jovanović and D Pešić and V Bojović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544460959&doi=10.2298%2fJSC0505727K&partnerID=40&md5=e111d0246c3d560da1171664f8fd193e},
doi = {10.2298/JSC0505727K},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {5},
pages = {727-733},
abstract = {Frank-Condon factors and ^centroids have been calculated for the B 2 ∑ + -X 2 ∑ + bands of the 10 B 18 O and 11 B 18 O isotopic molecules assuming that both the B and X states follow a Morse potential curve. The calculated q v′v″ values are compared with observed band intensities and the relationship between the r-centroids and the band positions has been determined and is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Frank-Condon factors and ^centroids have been calculated for the B 2 ∑ + -X 2 ∑ + bands of the 10 B 18 O and 11 B 18 O isotopic molecules assuming that both the B and X states follow a Morse potential curve. The calculated q v′v″ values are compared with observed band intensities and the relationship between the r-centroids and the band positions has been determined and is discussed.
1412.
Jerosimić, S; Krmar, M; Radić-Perić, J; Perić, M
Theoretical investigation of the hyperfine structure in spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 3, pp. 423-439, 2005.
@article{Jerosimić2005423,
title = {Theoretical investigation of the hyperfine structure in spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules},
author = {S Jerosimić and M Krmar and J Radić-Perić and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544441652&doi=10.2298%2fJSC0503423J&partnerID=40&md5=a30a4092049da3b5433cb013755a1cf7},
doi = {10.2298/JSC0503423J},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {3},
pages = {423-439},
abstract = {The present paper reviews the results of ab initio studies on the magnetic hyperfme structure in spectra of spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules. The main goal of the present paper is to show that such theoretical investigations can be used to reliably reproduce, explain and predict the results of the corresponding measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present paper reviews the results of ab initio studies on the magnetic hyperfme structure in spectra of spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules. The main goal of the present paper is to show that such theoretical investigations can be used to reliably reproduce, explain and predict the results of the corresponding measurements.
1413.
Hercigonja, R; Dondur, V; Rakić, V
A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 12, pp. 1409-1418, 2005.
@article{Hercigonja20051409,
title = {A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites},
author = {R Hercigonja and V Dondur and V Rakić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544454437&doi=10.2298%2fJSC0512409H&partnerID=40&md5=6b1ec1094b5675bcd623feb46d29715f},
doi = {10.2298/JSC0512409H},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {12},
pages = {1409-1418},
abstract = {In this work, the free eneregy changes and entropy changes of adsorption of n-hexane on zeolites of the M x Na 87-2X X (M = Co, Ni, Zn, Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na + ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work, the free eneregy changes and entropy changes of adsorption of n-hexane on zeolites of the M x Na 87-2X X (M = Co, Ni, Zn, Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na + ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation.
1414.
Mojović, M; Vuletić, M; Bačić, G G
Detection of oxygen-centered radicals using EPR spin-trap DEPMPO: The effect of oxygen Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 471-475, 2005.
@article{Mojović2005471,
title = {Detection of oxygen-centered radicals using EPR spin-trap DEPMPO: The effect of oxygen},
author = {M Mojović and M Vuletić and G G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144438044&doi=10.1196%2fannals.1342.069&partnerID=40&md5=4fd9ec4cc020b2163dc91a51ef38f486},
doi = {10.1196/annals.1342.069},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {471-475},
abstract = {Studies of the ability of the EPR spin trap DEPMPO to detect both superoxide and hydroxyl radicals produced by systems in vitro and in vivo are presented. Experiments using free radical-generating systems confirmed the suitability of the EPR spin trapping technique but also revealed the existence of an undesirable conversion of DEPMPO/OOH into DEPMPO/OH adducts. The rate of conversion decreases with oxygenation, and the production of oxygen-centered radicals increases. However, this property of DEPMPO does not have a significant influence on its ability to independently detect radicals produced by plant plasma membranes. Since the adduct conversion appears to be rather slow compared to radical generation, we conclude that the DEPMPO spin-trap can be efficiently used for detection of oxygen-centered radicals produced by systems in vivo, as demonstrated for isolated plasma membranes. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Studies of the ability of the EPR spin trap DEPMPO to detect both superoxide and hydroxyl radicals produced by systems in vitro and in vivo are presented. Experiments using free radical-generating systems confirmed the suitability of the EPR spin trapping technique but also revealed the existence of an undesirable conversion of DEPMPO/OOH into DEPMPO/OH adducts. The rate of conversion decreases with oxygenation, and the production of oxygen-centered radicals increases. However, this property of DEPMPO does not have a significant influence on its ability to independently detect radicals produced by plant plasma membranes. Since the adduct conversion appears to be rather slow compared to radical generation, we conclude that the DEPMPO spin-trap can be efficiently used for detection of oxygen-centered radicals produced by systems in vivo, as demonstrated for isolated plasma membranes. © 2005 New York Academy of Sciences.
1415.
Veljović-Jovanović, S; Kukavica, B; Cvetić, T; Mojović, M; Vučinić, Ž
Ascorbic acid and the oxidative processes in pea root cell wall isolates: Characterization by fluorescence and EPR spectroscopy Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 500-504, 2005.
@article{Veljović-Jovanović2005500,
title = {Ascorbic acid and the oxidative processes in pea root cell wall isolates: Characterization by fluorescence and EPR spectroscopy},
author = {S Veljović-Jovanović and B Kukavica and T Cvetić and M Mojović and Ž Vučinić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144470117&doi=10.1196%2fannals.1342.076&partnerID=40&md5=0d832399737d944722017d3ab82e5494},
doi = {10.1196/annals.1342.076},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {500-504},
abstract = {A comparative fluorescence and oxygen radical-sensitive spin trap EPR spectroscopic study of isolated cell walls (with proteins or deproteinated), in the presence and absence of ascorbate and H2O2 is presented. Fluorescence spectra indicate the presence of at least two fluorophores, one degraded and the other synthesized after reduction or oxidation, indicating phenol di/polymerization. DEPMPO spin trap measurements show that isolated cell walls are capable of oxygen-dependent hydroxyl radical generation in the absence of NADH or other reductants, ascorbate addition, or deproteination of the cell wall abolishing the signal due to hydroxyl radicals. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A comparative fluorescence and oxygen radical-sensitive spin trap EPR spectroscopic study of isolated cell walls (with proteins or deproteinated), in the presence and absence of ascorbate and H2O2 is presented. Fluorescence spectra indicate the presence of at least two fluorophores, one degraded and the other synthesized after reduction or oxidation, indicating phenol di/polymerization. DEPMPO spin trap measurements show that isolated cell walls are capable of oxygen-dependent hydroxyl radical generation in the absence of NADH or other reductants, ascorbate addition, or deproteination of the cell wall abolishing the signal due to hydroxyl radicals. © 2005 New York Academy of Sciences.
1416.
Marković, D M; Marković, D A
The relationship between some meteorological parameters and the tropospheric concentrations of ozone in the urban area of Belgrade Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 12, pp. 1487-1495, 2005.
@article{Marković20051487,
title = {The relationship between some meteorological parameters and the tropospheric concentrations of ozone in the urban area of Belgrade},
author = {D M Marković and D A Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544444177&doi=10.2298%2fJSC0512487M&partnerID=40&md5=367a68b1ed7518680a9e5394cbc330f1},
doi = {10.2298/JSC0512487M},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {12},
pages = {1487-1495},
abstract = {During the period between June and December 2002, the concentrations of ozone in the air at 4 measuring sites in Belgrade were measured. The measuring periods varied from 10 days to several weeks. The maximal measured daily concentrations of ozone ranged from 19 ppbv (23 December 2002) to 118 ppbv (23 June 2002). Ozone concentrations higher than, or equal to 90 ppbv were registered at three measuring sites. It was shown that at measuring sites characterized as urban, maximal O 3 concentrations equal to, or higher than 90 ppbv occurred at high temperatures (higher than 30°C) and low wind speeds (mostly from the north). The measured ozone concentrations mostly showed characteristics usual for a daily photochemical ozone cycle, excluding the specificities influenced by the measuring site itself. Ozone transport was recorded at increased wind speeds, primarily from south-easterly directions. On the basis of he correlations between ozone concentration and the corresponding meteorological parameters, a validation of the measuring sites was performed from the aspect of their representativeness for the measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
During the period between June and December 2002, the concentrations of ozone in the air at 4 measuring sites in Belgrade were measured. The measuring periods varied from 10 days to several weeks. The maximal measured daily concentrations of ozone ranged from 19 ppbv (23 December 2002) to 118 ppbv (23 June 2002). Ozone concentrations higher than, or equal to 90 ppbv were registered at three measuring sites. It was shown that at measuring sites characterized as urban, maximal O 3 concentrations equal to, or higher than 90 ppbv occurred at high temperatures (higher than 30°C) and low wind speeds (mostly from the north). The measured ozone concentrations mostly showed characteristics usual for a daily photochemical ozone cycle, excluding the specificities influenced by the measuring site itself. Ozone transport was recorded at increased wind speeds, primarily from south-easterly directions. On the basis of he correlations between ozone concentration and the corresponding meteorological parameters, a validation of the measuring sites was performed from the aspect of their representativeness for the measurements.
1417.
Mladenović, M; Perić, M; Engels, B
An ab initio study of the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π electronic state of NCO Journal Article
In: Journal of Chemical Physics, vol. 122, no. 14, 2005.
@article{Mladenović2005c,
title = {An ab initio study of the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π electronic state of NCO},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844442148&doi=10.1063%2f1.1876072&partnerID=40&md5=305a684efdc65514fdaaca45a5726231},
doi = {10.1063/1.1876072},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Physics},
volume = {122},
number = {14},
abstract = {In the present study we give the results of the ab initio calculations on the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π u 2 electronic state of the NCO radical. The calculations of the potential surfaces and the electronic mean values of the hyperfine coupling constants are carried out by means of the density functional theory approach (B3LYP functional combined with an atomic orbital basis set suitable for calculations of the hyperfine structure). The vibronic levels, spin-orbit splitting, and the vibronic mean values of the components of the hyperfine tensor in the vibronic species are calculated using a variational method. The results of the calculations are in good agreement with the available experimental data. © 2005 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the present study we give the results of the ab initio calculations on the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π u 2 electronic state of the NCO radical. The calculations of the potential surfaces and the electronic mean values of the hyperfine coupling constants are carried out by means of the density functional theory approach (B3LYP functional combined with an atomic orbital basis set suitable for calculations of the hyperfine structure). The vibronic levels, spin-orbit splitting, and the vibronic mean values of the components of the hyperfine tensor in the vibronic species are calculated using a variational method. The results of the calculations are in good agreement with the available experimental data. © 2005 American Institute of Physics.
1418.
Popović-Bijelić, A; Bijelić, G; Jorgovanović, N; Bojanić, D; Popović, M B; Popović, D B
Multi-field surface electrode for selective electrical stimulation Journal Article
In: Artificial Organs, vol. 29, no. 6, pp. 448-452, 2005.
@article{Popović-Bijelić2005448,
title = {Multi-field surface electrode for selective electrical stimulation},
author = {A Popović-Bijelić and G Bijelić and N Jorgovanović and D Bojanić and M B Popović and D B Popović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24944440860&doi=10.1111%2fj.1525-1594.2005.29075.x&partnerID=40&md5=8b290eb088cf71b50e29b37f7824f363},
doi = {10.1111/j.1525-1594.2005.29075.x},
year = {2005},
date = {2005-01-01},
journal = {Artificial Organs},
volume = {29},
number = {6},
pages = {448-452},
abstract = {We designed a 24-field array and an on-line control box that selects which and how many of 24 fields will conduct electrical charge during functional electrical stimulation. The array was made using a conductive microfiber textile, silver two-component adhesive, and the conductive ink imprint on the polycarbonate. The control box comprised 24 switches that corresponded one-to-one to the fields on the array. Each field could be made conductive or nonconductive by simple pressing of the corresponding push-button type switch on the control box. We present here representative results of the selectivity of the new electrode measured in three tetraplegic patients during functional electrical stimulation of the forearm. The task was to generate finger flexion and extension with minimal interference of the wrist movement during lateral and palmar grasps. Therapists determined the appropriate pattern that lead to effective grasping, lasting on average 5 min per stimulation channel in the first session. This optimal conductive pattern (size and shape) provided effective finger flexion and extension with minimal wrist flexion/extension and ulnar/radial deviations (<10 degrees). The optimal size and shape of the electrode in all cases had a branched pattern. The selection of the optimal stimulation site was achieved without moving the electrode. The size and shape were reproducible in the same subject from session to session, yet were different from subject to subject. The optimal electrode size and shape changed when subjects pronated and supinated their forearm. The control box includes a program that can dynamically change the number and sites of the conductive fields; hence, it is feasible to use this during functional movements. Subjects learned how to determine the optimal electrode pattern; hence, these electrodes could be effective for home usage. © 2005 International Center for Artificial Organs and Transplantation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We designed a 24-field array and an on-line control box that selects which and how many of 24 fields will conduct electrical charge during functional electrical stimulation. The array was made using a conductive microfiber textile, silver two-component adhesive, and the conductive ink imprint on the polycarbonate. The control box comprised 24 switches that corresponded one-to-one to the fields on the array. Each field could be made conductive or nonconductive by simple pressing of the corresponding push-button type switch on the control box. We present here representative results of the selectivity of the new electrode measured in three tetraplegic patients during functional electrical stimulation of the forearm. The task was to generate finger flexion and extension with minimal interference of the wrist movement during lateral and palmar grasps. Therapists determined the appropriate pattern that lead to effective grasping, lasting on average 5 min per stimulation channel in the first session. This optimal conductive pattern (size and shape) provided effective finger flexion and extension with minimal wrist flexion/extension and ulnar/radial deviations (<10 degrees). The optimal size and shape of the electrode in all cases had a branched pattern. The selection of the optimal stimulation site was achieved without moving the electrode. The size and shape were reproducible in the same subject from session to session, yet were different from subject to subject. The optimal electrode size and shape changed when subjects pronated and supinated their forearm. The control box includes a program that can dynamically change the number and sites of the conductive fields; hence, it is feasible to use this during functional movements. Subjects learned how to determine the optimal electrode pattern; hence, these electrodes could be effective for home usage. © 2005 International Center for Artificial Organs and Transplantation.
1419.
Spasojević, I; Maksimović, V; Zakrzewska, J; Bačić, G
Effects of 5-fluorouracil on erythrocytes in relation to its cardiotoxicity: Membrane structure and functioning Journal Article
In: Journal of Chemical Information and Modeling, vol. 45, no. 6, pp. 1680-1685, 2005.
@article{Spasojević20051680,
title = {Effects of 5-fluorouracil on erythrocytes in relation to its cardiotoxicity: Membrane structure and functioning},
author = {I Spasojević and V Maksimović and J Zakrzewska and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944432545&doi=10.1021%2fci0501746&partnerID=40&md5=b735364fdebc4178f3aa3fa2a9f61261},
doi = {10.1021/ci0501746},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Information and Modeling},
volume = {45},
number = {6},
pages = {1680-1685},
abstract = {In the present study, we showed that the antineoplastic drug 5-fluorouracil (5-FU) induces in vitro exposure-time/dose-dependent changes on the level of an erythrocyte's morphology, ionic balance, and membrane fluidity. These changes are partially or fully irreversible, and we suggest that they are provoked by an irreversible depletion of ATP. Because of these changes that could also occur in vivo during 5-FU infusion, a certain amount of erythrocytes with echinocytic shape and diminished ability to deliver oxygen is present in blood for longer periods of time. This renders oxygen transport and delivery more difficult, leaving the heart with an insufficient supply of oxygen, thus leading to cardiotoxicity. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the present study, we showed that the antineoplastic drug 5-fluorouracil (5-FU) induces in vitro exposure-time/dose-dependent changes on the level of an erythrocyte's morphology, ionic balance, and membrane fluidity. These changes are partially or fully irreversible, and we suggest that they are provoked by an irreversible depletion of ATP. Because of these changes that could also occur in vivo during 5-FU infusion, a certain amount of erythrocytes with echinocytic shape and diminished ability to deliver oxygen is present in blood for longer periods of time. This renders oxygen transport and delivery more difficult, leaving the heart with an insufficient supply of oxygen, thus leading to cardiotoxicity. © 2005 American Chemical Society.
1420.
Radotić, K; Mićić, M; Jeremić, M
New insights into the structural organization of the plant polymer lignin Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 215-229, 2005.
@article{Radotić2005215,
title = {New insights into the structural organization of the plant polymer lignin},
author = {K Radotić and M Mićić and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144465443&doi=10.1196%2fannals.1342.020&partnerID=40&md5=c861743c59017bbddd704bdac001d7de},
doi = {10.1196/annals.1342.020},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {215-229},
abstract = {The organizational features of lignin structure and the mechanism of its synthesis have significant implications for the response of the plant to stress. It was unknown whether the enzymic formation of lignin in the cell wall is an uncontrolled process or finely regulated in time and space. In vitro scanning tunneling microscopy (STM), atomic force microscopies (AFM), near-field scanning optical microscopy (NSOM). and the novel environmental scanning electron microscopy (ESEM) imaging studies of the lignin model compounds have directly shown its highly ordered structure and elucidated its modular and fractal organization. Direct evidence was presented for the existence of strong intermolecular forces responsible for holding lignin globules together in highly ordered structures. Fractal analysis was applied as a theoretical approach, to show regularity and modular organization of lignin. Surface chemistry studies of the lignin monolayer reveal intrinsic properties that may be a key to osmotic pressure and cell size control mechanism in the higher plant cells. The obtained data contribute to the explanation of the mechanisms of cell wall synthesis in vivo. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The organizational features of lignin structure and the mechanism of its synthesis have significant implications for the response of the plant to stress. It was unknown whether the enzymic formation of lignin in the cell wall is an uncontrolled process or finely regulated in time and space. In vitro scanning tunneling microscopy (STM), atomic force microscopies (AFM), near-field scanning optical microscopy (NSOM). and the novel environmental scanning electron microscopy (ESEM) imaging studies of the lignin model compounds have directly shown its highly ordered structure and elucidated its modular and fractal organization. Direct evidence was presented for the existence of strong intermolecular forces responsible for holding lignin globules together in highly ordered structures. Fractal analysis was applied as a theoretical approach, to show regularity and modular organization of lignin. Surface chemistry studies of the lignin monolayer reveal intrinsic properties that may be a key to osmotic pressure and cell size control mechanism in the higher plant cells. The obtained data contribute to the explanation of the mechanisms of cell wall synthesis in vivo. © 2005 New York Academy of Sciences.
2005
Bojovic, V; Antić-Jovanović, A; Kuzmanović, M
High-resolution spectra of the10B18O and 11B18O: Rotational analysis of the B-X bands Journal Article
In: Chinese Physics Letters, vol. 22, no. 4, pp. 857-860, 2005.
@article{Bojovic2005857,
title = {High-resolution spectra of the10B18O and 11B18O: Rotational analysis of the B-X bands},
author = {V Bojovic and A Antić-Jovanović and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24144463908&doi=10.1088%2f0256-307X%2f22%2f4%2f022&partnerID=40&md5=bc7019ffb0c50aa16e94ede010431d07},
doi = {10.1088/0256-307X/22/4/022},
year = {2005},
date = {2005-01-01},
journal = {Chinese Physics Letters},
volume = {22},
number = {4},
pages = {857-860},
abstract = {Emission spectra of 10B18O and 11B 18O isotopomers in the 230-330nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants B e, and D e for both isotope species 10B 18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (v + 1/2), the value of equilibrium distance re in the lower state has been derived. © 2005 Chinese Physical Society and IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Emission spectra of 10B18O and 11B 18O isotopomers in the 230-330nm region have been investigated by means of conventional high-resolution spectroscopy. The molecules were produced in a low-pressure arc by discharging 8 Torr of mixture containing argon and oxygen 18 in the ratio of 4:1 and the spectra have been recorded using Ebert-type spectrograph. The boron needed to produce BO has been present in the system as amorphous powder with natural abundance of 10B and 11B. Rotational analysis of the 0, 0 and 0, 1 bands has been performed and spectroscopic constants have been extracted. The results have allowed first determination of the equilibrium rotational constants B e, and D e for both isotope species 10B 18O and 11B18O in their lower electronic state. Assuming a linear dependence of Be on (v + 1/2), the value of equilibrium distance re in the lower state has been derived. © 2005 Chinese Physical Society and IOP Publishing Ltd.
Dragović, S; Onjia, A; Stanković, S; Aničin, I; Bačić, G
Artificial neural network modelling of uncertainty in gamma-ray spectrometry Journal Article
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 540, no. 2-3, pp. 455-463, 2005.
@article{Dragović2005455,
title = {Artificial neural network modelling of uncertainty in gamma-ray spectrometry},
author = {S Dragović and A Onjia and S Stanković and I Aničin and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-17844383973&doi=10.1016%2fj.nima.2004.11.045&partnerID=40&md5=3af7c121d71adb4539ed072b182dff1c},
doi = {10.1016/j.nima.2004.11.045},
year = {2005},
date = {2005-01-01},
journal = {Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
volume = {540},
number = {2-3},
pages = {455-463},
abstract = {An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides ( 226 Ra, 238 U, 235 U, 40 K, 232 Th, 134 Cs, 137 Cs and 7 Be) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium ( 238 U/ 232 Th) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the 238 U/ 232 Th ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An artificial neural network (ANN) model for the prediction of measuring uncertainties in gamma-ray spectrometry was developed and optimized. A three-layer feed-forward ANN with back-propagation learning algorithm was used to model uncertainties of measurement of activity levels of eight radionuclides ( 226 Ra, 238 U, 235 U, 40 K, 232 Th, 134 Cs, 137 Cs and 7 Be) in soil samples as a function of measurement time. It was shown that the neural network provides useful data even from small experimental databases. The performance of the optimized neural network was found to be very good, with correlation coefficients (R2) between measured and predicted uncertainties ranging from 0.9050 to 0.9915. The correlation coefficients did not significantly deteriorate when the network was tested on samples with greatly different uranium-to-thorium ( 238 U/ 232 Th) ratios. The differences between measured and predicted uncertainties were not influenced by the absolute values of uncertainties of measured radionuclide activities. Once the ANN is trained, it could be employed in analyzing soil samples regardless of the 238 U/ 232 Th ratio. It was concluded that a considerable saving in time could be obtained using the trained neural network model for predicting the measurement times needed to attain the desired statistical accuracy. © 2004 Elsevier B.V. All rights reserved.
Marković, J M Dimitrić; Petranović, N A; Baranac, J M
The copigmentation effect of sinapic acid on malvin: A spectroscopic investigation on colour enhancement Journal Article
In: Journal of Photochemistry and Photobiology B: Biology, vol. 78, no. 3, pp. 223-228, 2005.
@article{DimitrićMarković2005223,
title = {The copigmentation effect of sinapic acid on malvin: A spectroscopic investigation on colour enhancement},
author = {J M Dimitrić Marković and N A Petranović and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-13544249909&doi=10.1016%2fj.jphotobiol.2004.11.009&partnerID=40&md5=19f599436511feea97fad622e46e5cb8},
doi = {10.1016/j.jphotobiol.2004.11.009},
year = {2005},
date = {2005-01-01},
journal = {Journal of Photochemistry and Photobiology B: Biology},
volume = {78},
number = {3},
pages = {223-228},
abstract = {The present paper reports on spectroscopic investigation of copigmentation effect of sinapic acid on the malvin molecule. A reaction of copigmentation was investigated by the use of UV-Vis absorption spectra in the whole range of acidic and moderately acidic buffered aqueous solutions (pH range 1.0-6.0). It was observed that the ratio (A - A0)/A0, as a good measure of the copigment effect, has its maximum value at pH 3.6. The influences of the pH of the meduim, molecular concentration, and temperature were investigated. The reaction was thermo-dynamically defined in terms of ΔH0, ΔG0 and ΔS0 values. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present paper reports on spectroscopic investigation of copigmentation effect of sinapic acid on the malvin molecule. A reaction of copigmentation was investigated by the use of UV-Vis absorption spectra in the whole range of acidic and moderately acidic buffered aqueous solutions (pH range 1.0-6.0). It was observed that the ratio (A - A0)/A0, as a good measure of the copigment effect, has its maximum value at pH 3.6. The influences of the pH of the meduim, molecular concentration, and temperature were investigated. The reaction was thermo-dynamically defined in terms of ΔH0, ΔG0 and ΔS0 values. © 2004 Elsevier B.V. All rights reserved.
Mladenović, M; Perić, M; Ranković, R; Engels, B
In: Molecular Physics, vol. 103, no. 4, pp. 587-598, 2005.
@article{Mladenović2005587,
title = {An ab initio study of the hyperfine structure in the X 2 Π electronic state of HCCS-calculation of vibronically averaged components of the anizotropic hyperfine tensor},
author = {M Mladenović and M Perić and R Ranković and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27944506748&doi=10.1080%2f00268970412331332097&partnerID=40&md5=fb96b3f71f42157d445ec4f6f6c1acc0},
doi = {10.1080/00268970412331332097},
year = {2005},
date = {2005-01-01},
journal = {Molecular Physics},
volume = {103},
number = {4},
pages = {587-598},
abstract = {Theresults 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 the HCCS radical are reported. The electronically averaged hyperfine coupling constants for hydrogen, deuterium, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. 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. The results of ab initio calculations are compared to the corresponding experimental findings. © 2005 Taylor & Francis Group Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Theresults 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 the HCCS radical are reported. The electronically averaged hyperfine coupling constants for hydrogen, deuterium, 13 C and 33 S are obtained as functions of two bending vibrational modes by the density functional theory method. 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. The results of ab initio calculations are compared to the corresponding experimental findings. © 2005 Taylor & Francis Group Ltd.
Marković, J M Dimitrić; Baranac, J M; Brdarić, T P
Electronic and infrared vibrational analysis of cyanidin-quercetin copigment complex Journal Article
In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol. 62, no. 1-3, pp. 673-680, 2005.
@article{DimitrićMarković2005673,
title = {Electronic and infrared vibrational analysis of cyanidin-quercetin copigment complex},
author = {J M Dimitrić Marković and J M Baranac and T P Brdarić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27644593802&doi=10.1016%2fj.saa.2005.02.036&partnerID=40&md5=ca15529809b6bbe40b6e82527fb64313},
doi = {10.1016/j.saa.2005.02.036},
year = {2005},
date = {2005-01-01},
journal = {Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy},
volume = {62},
number = {1-3},
pages = {673-680},
abstract = {Copigment complex formation between cyanidin and quercetin, in aqueous buffered solutions, was studied by electronic absorption and infrared vibrational spectroscopies. It was found that the association of cyanidin with quercetin occurred at pH 3.0 and pH 5.0 including cyanidin flavylium ion and anhydrobase transformation forms, respectively. Obtained copigmentation constant values of K = 2726.7 (pH 3.0) and K = 1093.1 (pH 5.0) indicated good association ability of the investigated molecules. Infrared spectra revealed the existence of hydrogen bonds in the copigment complexes structures. The analysis of the deconvoluted infrared spectra indicated several types of hydrogen bonds, differently formed: the HO⋯H bonds with the corresponding bands around 3500 cm -1 and bonds formed via H 3 O + , oxonium, ion of the molecules with the corresponding bands below 3000 cm -1 . © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Copigment complex formation between cyanidin and quercetin, in aqueous buffered solutions, was studied by electronic absorption and infrared vibrational spectroscopies. It was found that the association of cyanidin with quercetin occurred at pH 3.0 and pH 5.0 including cyanidin flavylium ion and anhydrobase transformation forms, respectively. Obtained copigmentation constant values of K = 2726.7 (pH 3.0) and K = 1093.1 (pH 5.0) indicated good association ability of the investigated molecules. Infrared spectra revealed the existence of hydrogen bonds in the copigment complexes structures. The analysis of the deconvoluted infrared spectra indicated several types of hydrogen bonds, differently formed: the HO⋯H bonds with the corresponding bands around 3500 cm -1 and bonds formed via H 3 O + , oxonium, ion of the molecules with the corresponding bands below 3000 cm -1 . © 2005 Elsevier B.V. All rights reserved.
Bačić, G; Mojović, M
EPR spin trapping of oxygen radicals in plants: A methodological overview Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 230-243, 2005.
@article{Bačić2005230,
title = {EPR spin trapping of oxygen radicals in plants: A methodological overview},
author = {G Bačić and M Mojović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144448116&doi=10.1196%2fannals.1342.021&partnerID=40&md5=9546b82c7ac3c70df190c2a11beaa8cb},
doi = {10.1196/annals.1342.021},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {230-243},
abstract = {We present a brief account of the difficulties involved in detection of oxygen free radicals in plants and give a rationale for using the EPR spin trapping technique in such studies. Comparative analysis of characteristics of different spin traps is given, having in mind their suitability in trapping oxygen-centered free radicals. Certain technical aspects of EPR experiments related to successful trapping of free radicals are discussed. Previous studies of trapping of oxygen radicals in plants are reviewed in terms of how efficient the experimental approach employed has been in their detection and how this influences conclusions about the mechanisms of their production. In addition, we analyze the potential of spin labels in the analysis of free radical production in plants and demonstrate that the combination of EPR spin traps and spin labels is extremely efficient for this purpose. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a brief account of the difficulties involved in detection of oxygen free radicals in plants and give a rationale for using the EPR spin trapping technique in such studies. Comparative analysis of characteristics of different spin traps is given, having in mind their suitability in trapping oxygen-centered free radicals. Certain technical aspects of EPR experiments related to successful trapping of free radicals are discussed. Previous studies of trapping of oxygen radicals in plants are reviewed in terms of how efficient the experimental approach employed has been in their detection and how this influences conclusions about the mechanisms of their production. In addition, we analyze the potential of spin labels in the analysis of free radical production in plants and demonstrate that the combination of EPR spin traps and spin labels is extremely efficient for this purpose. © 2005 New York Academy of Sciences.
Radić-Perić, J; Dašić, A
Thermodynamic study of decomposition of dichlorodifluoromethane in thermal plasma Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 79, no. 1, pp. 59-64, 2005.
@article{Radić-Perić200559,
title = {Thermodynamic study of decomposition of dichlorodifluoromethane in thermal plasma},
author = {J Radić-Perić and A Dašić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-18244402165&doi=10.1007%2fs10973-004-0562-9&partnerID=40&md5=607bc9aa525fd4e410c317fdbede88f4},
doi = {10.1007/s10973-004-0562-9},
year = {2005},
date = {2005-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {79},
number = {1},
pages = {59-64},
abstract = {Decomposition of dichlorodifluoromethane in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving carbon, chlorine and fluorine in presence of argon (which is assumed to be the main plasma gas) and/or in addition of hydrogen and calcium together with hydrogen. The calculations were carried out for the temperature range between 500 and 6000 K and for the total pressure of the system of 1 bar. Use is made of the fact that a thermal plasma is a plasma in (local) thermal equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state. The results of calculations show that toxic molecules and radicals can be, under convenient conditions (appropriate temperature and amount of added substances), converted into stable non-toxic species like CaF2 and CaCl2. © 2005 Akadémiai Kladó, Budapest.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Decomposition of dichlorodifluoromethane in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving carbon, chlorine and fluorine in presence of argon (which is assumed to be the main plasma gas) and/or in addition of hydrogen and calcium together with hydrogen. The calculations were carried out for the temperature range between 500 and 6000 K and for the total pressure of the system of 1 bar. Use is made of the fact that a thermal plasma is a plasma in (local) thermal equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state. The results of calculations show that toxic molecules and radicals can be, under convenient conditions (appropriate temperature and amount of added substances), converted into stable non-toxic species like CaF2 and CaCl2. © 2005 Akadémiai Kladó, Budapest.
Spasojević, I; Zakrzewska, J; Bačić, G G
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 311-320, 2005.
@article{Spasojević2005311,
title = {31P NMR spectroscopy and polarographic combined study of erythrocytes treated with 5-fluorouracil: Cardiotoxicity-related changes in ATP,2,3-BPG, and O2 metabolism},
author = {I Spasojević and J Zakrzewska and G G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144480370&doi=10.1196%2fannals.1342.028&partnerID=40&md5=92b5d7732e5f6d142270b6c904dcc5d8},
doi = {10.1196/annals.1342.028},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {311-320},
abstract = {Antineoplastic drug 5-fluorouracil (5-FU) frequently shows cardiotoxic effects, the mechanism of which has not yet been elucidated. The objective of the present study was to explore effects of 5-FU on metabolism of ATP,2,3-BPG, and oxygen in erythrocytes and to relate these to the phenomenon of 5-FU cardiotoxicity. We determined that 5-FU induced rapid increase in O2 consumption, which led to drastic changes in the metabolism of phosphate compounds in erythrocytes. Decrease in pO2 provoked increase in production of 2,3-BPG and subsequent deoxygenation of oxyHb to deoxyHb. However, the most important effect of 5-FU on erythrocytes is severe decrease in the level of ATP. This could lead to a number of irreversible changes in erythrocyte structure and functioning, such as echinocytosis, increase in membrane fluidity, and non-functioning of membrane ion pumps. All these changes affect normal functioning of erythrocytes, leading to difficulties in oxygen transport and insufficient supply of oxygen to the heart, and pointing to the importance of studying the effects of antineoplastic drugs on intracellular metabolism of erythrocytes. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Antineoplastic drug 5-fluorouracil (5-FU) frequently shows cardiotoxic effects, the mechanism of which has not yet been elucidated. The objective of the present study was to explore effects of 5-FU on metabolism of ATP,2,3-BPG, and oxygen in erythrocytes and to relate these to the phenomenon of 5-FU cardiotoxicity. We determined that 5-FU induced rapid increase in O2 consumption, which led to drastic changes in the metabolism of phosphate compounds in erythrocytes. Decrease in pO2 provoked increase in production of 2,3-BPG and subsequent deoxygenation of oxyHb to deoxyHb. However, the most important effect of 5-FU on erythrocytes is severe decrease in the level of ATP. This could lead to a number of irreversible changes in erythrocyte structure and functioning, such as echinocytosis, increase in membrane fluidity, and non-functioning of membrane ion pumps. All these changes affect normal functioning of erythrocytes, leading to difficulties in oxygen transport and insufficient supply of oxygen to the heart, and pointing to the importance of studying the effects of antineoplastic drugs on intracellular metabolism of erythrocytes. © 2005 New York Academy of Sciences.
Pejić, N; Blagojević, S; Anić, S; Vukojević, V; Kolar-Anić, L
Microquantitative determination of hesperidin by pulse perturbation of the oscillatory reaction system Journal Article
In: Analytical and Bioanalytical Chemistry, vol. 381, no. 3, pp. 775-780, 2005.
@article{Pejić2005775,
title = {Microquantitative determination of hesperidin by pulse perturbation of the oscillatory reaction system},
author = {N Pejić and S Blagojević and S Anić and V Vukojević and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-15044364234&doi=10.1007%2fs00216-004-2913-6&partnerID=40&md5=0b824e79a4daaa870b02ca93253fd43f},
doi = {10.1007/s00216-004-2913-6},
year = {2005},
date = {2005-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {381},
number = {3},
pages = {775-780},
abstract = {A simple and reliable kinetic method for the determination of hesperidin (Hesp) is developed. It is based on potentiometric monitoring of the concentration perturbations of the matrix reaction system which is in a stable non-equilibrium stationary state close to the bifurcation point. The Bray-Liebhafsky oscillatory reaction is used as the matrix system. The response of the matrix to perturbations by different concentrations of Hesp is followed by using a Pt electrode. A linear relationship between maximal potential shift and the logarithm of Hesp concentrations is obtained between 7.5 and 599.4 μg mL -1 . The limit of detection is 0.65 μg mL -1 . The described procedure has been successfully applied to the determination of Hesp from different sources (capsules, industrial and hand-squeezed orange juice, and white wine). © Springer-Verlag 2005.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A simple and reliable kinetic method for the determination of hesperidin (Hesp) is developed. It is based on potentiometric monitoring of the concentration perturbations of the matrix reaction system which is in a stable non-equilibrium stationary state close to the bifurcation point. The Bray-Liebhafsky oscillatory reaction is used as the matrix system. The response of the matrix to perturbations by different concentrations of Hesp is followed by using a Pt electrode. A linear relationship between maximal potential shift and the logarithm of Hesp concentrations is obtained between 7.5 and 599.4 μg mL -1 . The limit of detection is 0.65 μg mL -1 . The described procedure has been successfully applied to the determination of Hesp from different sources (capsules, industrial and hand-squeezed orange juice, and white wine). © Springer-Verlag 2005.
Mojović, M; Spasojević, I; Bačić, G
Detection of hydrogen atom adduct of spin-trap DEPMPO. The relevance for studies of biological systems Journal Article
In: Journal of Chemical Information and Modeling, vol. 45, no. 6, pp. 1716-1718, 2005.
@article{Mojović20051716,
title = {Detection of hydrogen atom adduct of spin-trap DEPMPO. The relevance for studies of biological systems},
author = {M Mojović and I Spasojević and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944439903&doi=10.1021%2fci050173d&partnerID=40&md5=ad8614aa10785184910cfbae82e481df},
doi = {10.1021/ci050173d},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Information and Modeling},
volume = {45},
number = {6},
pages = {1716-1718},
abstract = {We proposed EPR spectroscopy using spin-trap DEPMPO as a novel method for the detection of a hydrogen atom (*H) produced by chemical and biological systems. In complex EPR spectra of DEPMPO adducts in biological systems, spectral lines of unknown origin have been observed. We have assumed (Bačič, G.; Mojović, M. Ann. N. Y. Acad. Sci. 2005, 1048, 230-243) that those lines represent the spectrum of a hydrogen atom (*H) adduct i.e., DEPMPO/H. An electrochemical system known to produce only *H radicals was used here in order to obtain a separate spectrum of the DEPMPO/H adduct. An acquired spectrum as well as a computer spectral simulation of the DEPMPO/H adduct showed considerable resemblance with additional lines in the EPR spectra of DEPMPO adducts in biological systems-plant plasma membranes and cell walls. This shows that such a radical is produced by plants as well as that DEPMPO is suitable for detection in both electrochemical and biological systems. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We proposed EPR spectroscopy using spin-trap DEPMPO as a novel method for the detection of a hydrogen atom (*H) produced by chemical and biological systems. In complex EPR spectra of DEPMPO adducts in biological systems, spectral lines of unknown origin have been observed. We have assumed (Bačič, G.; Mojović, M. Ann. N. Y. Acad. Sci. 2005, 1048, 230-243) that those lines represent the spectrum of a hydrogen atom (*H) adduct i.e., DEPMPO/H. An electrochemical system known to produce only *H radicals was used here in order to obtain a separate spectrum of the DEPMPO/H adduct. An acquired spectrum as well as a computer spectral simulation of the DEPMPO/H adduct showed considerable resemblance with additional lines in the EPR spectra of DEPMPO adducts in biological systems-plant plasma membranes and cell walls. This shows that such a radical is produced by plants as well as that DEPMPO is suitable for detection in both electrochemical and biological systems. © 2005 American Chemical Society.
Kuzmanović, M; Antić-Jovanović, A; Pešić, D; Bojović, V
Franck-Condon factors and r-centroids for the B-X bands of 10 B 18 O and 11 B 18 O molecules Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 5, pp. 727-733, 2005.
@article{Kuzmanović2005727,
title = {Franck-Condon factors and r-centroids for the B-X bands of 10 B 18 O and 11 B 18 O molecules},
author = {M Kuzmanović and A Antić-Jovanović and D Pešić and V Bojović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544460959&doi=10.2298%2fJSC0505727K&partnerID=40&md5=e111d0246c3d560da1171664f8fd193e},
doi = {10.2298/JSC0505727K},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {5},
pages = {727-733},
abstract = {Frank-Condon factors and ^centroids have been calculated for the B 2 ∑ + -X 2 ∑ + bands of the 10 B 18 O and 11 B 18 O isotopic molecules assuming that both the B and X states follow a Morse potential curve. The calculated q v′v″ values are compared with observed band intensities and the relationship between the r-centroids and the band positions has been determined and is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Frank-Condon factors and ^centroids have been calculated for the B 2 ∑ + -X 2 ∑ + bands of the 10 B 18 O and 11 B 18 O isotopic molecules assuming that both the B and X states follow a Morse potential curve. The calculated q v′v″ values are compared with observed band intensities and the relationship between the r-centroids and the band positions has been determined and is discussed.
Jerosimić, S; Krmar, M; Radić-Perić, J; Perić, M
Theoretical investigation of the hyperfine structure in spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 3, pp. 423-439, 2005.
@article{Jerosimić2005423,
title = {Theoretical investigation of the hyperfine structure in spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules},
author = {S Jerosimić and M Krmar and J Radić-Perić and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544441652&doi=10.2298%2fJSC0503423J&partnerID=40&md5=a30a4092049da3b5433cb013755a1cf7},
doi = {10.2298/JSC0503423J},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {3},
pages = {423-439},
abstract = {The present paper reviews the results of ab initio studies on the magnetic hyperfme structure in spectra of spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules. The main goal of the present paper is to show that such theoretical investigations can be used to reliably reproduce, explain and predict the results of the corresponding measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present paper reviews the results of ab initio studies on the magnetic hyperfme structure in spectra of spatially and spin degenerate electronic states of triatomic and tetra-atomic molecules. The main goal of the present paper is to show that such theoretical investigations can be used to reliably reproduce, explain and predict the results of the corresponding measurements.
Hercigonja, R; Dondur, V; Rakić, V
A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 12, pp. 1409-1418, 2005.
@article{Hercigonja20051409,
title = {A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites},
author = {R Hercigonja and V Dondur and V Rakić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544454437&doi=10.2298%2fJSC0512409H&partnerID=40&md5=6b1ec1094b5675bcd623feb46d29715f},
doi = {10.2298/JSC0512409H},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {12},
pages = {1409-1418},
abstract = {In this work, the free eneregy changes and entropy changes of adsorption of n-hexane on zeolites of the M x Na 87-2X X (M = Co, Ni, Zn, Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na + ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work, the free eneregy changes and entropy changes of adsorption of n-hexane on zeolites of the M x Na 87-2X X (M = Co, Ni, Zn, Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na + ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation.
Mojović, M; Vuletić, M; Bačić, G G
Detection of oxygen-centered radicals using EPR spin-trap DEPMPO: The effect of oxygen Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 471-475, 2005.
@article{Mojović2005471,
title = {Detection of oxygen-centered radicals using EPR spin-trap DEPMPO: The effect of oxygen},
author = {M Mojović and M Vuletić and G G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144438044&doi=10.1196%2fannals.1342.069&partnerID=40&md5=4fd9ec4cc020b2163dc91a51ef38f486},
doi = {10.1196/annals.1342.069},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {471-475},
abstract = {Studies of the ability of the EPR spin trap DEPMPO to detect both superoxide and hydroxyl radicals produced by systems in vitro and in vivo are presented. Experiments using free radical-generating systems confirmed the suitability of the EPR spin trapping technique but also revealed the existence of an undesirable conversion of DEPMPO/OOH into DEPMPO/OH adducts. The rate of conversion decreases with oxygenation, and the production of oxygen-centered radicals increases. However, this property of DEPMPO does not have a significant influence on its ability to independently detect radicals produced by plant plasma membranes. Since the adduct conversion appears to be rather slow compared to radical generation, we conclude that the DEPMPO spin-trap can be efficiently used for detection of oxygen-centered radicals produced by systems in vivo, as demonstrated for isolated plasma membranes. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Studies of the ability of the EPR spin trap DEPMPO to detect both superoxide and hydroxyl radicals produced by systems in vitro and in vivo are presented. Experiments using free radical-generating systems confirmed the suitability of the EPR spin trapping technique but also revealed the existence of an undesirable conversion of DEPMPO/OOH into DEPMPO/OH adducts. The rate of conversion decreases with oxygenation, and the production of oxygen-centered radicals increases. However, this property of DEPMPO does not have a significant influence on its ability to independently detect radicals produced by plant plasma membranes. Since the adduct conversion appears to be rather slow compared to radical generation, we conclude that the DEPMPO spin-trap can be efficiently used for detection of oxygen-centered radicals produced by systems in vivo, as demonstrated for isolated plasma membranes. © 2005 New York Academy of Sciences.
Veljović-Jovanović, S; Kukavica, B; Cvetić, T; Mojović, M; Vučinić, Ž
Ascorbic acid and the oxidative processes in pea root cell wall isolates: Characterization by fluorescence and EPR spectroscopy Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 500-504, 2005.
@article{Veljović-Jovanović2005500,
title = {Ascorbic acid and the oxidative processes in pea root cell wall isolates: Characterization by fluorescence and EPR spectroscopy},
author = {S Veljović-Jovanović and B Kukavica and T Cvetić and M Mojović and Ž Vučinić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144470117&doi=10.1196%2fannals.1342.076&partnerID=40&md5=0d832399737d944722017d3ab82e5494},
doi = {10.1196/annals.1342.076},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {500-504},
abstract = {A comparative fluorescence and oxygen radical-sensitive spin trap EPR spectroscopic study of isolated cell walls (with proteins or deproteinated), in the presence and absence of ascorbate and H2O2 is presented. Fluorescence spectra indicate the presence of at least two fluorophores, one degraded and the other synthesized after reduction or oxidation, indicating phenol di/polymerization. DEPMPO spin trap measurements show that isolated cell walls are capable of oxygen-dependent hydroxyl radical generation in the absence of NADH or other reductants, ascorbate addition, or deproteination of the cell wall abolishing the signal due to hydroxyl radicals. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A comparative fluorescence and oxygen radical-sensitive spin trap EPR spectroscopic study of isolated cell walls (with proteins or deproteinated), in the presence and absence of ascorbate and H2O2 is presented. Fluorescence spectra indicate the presence of at least two fluorophores, one degraded and the other synthesized after reduction or oxidation, indicating phenol di/polymerization. DEPMPO spin trap measurements show that isolated cell walls are capable of oxygen-dependent hydroxyl radical generation in the absence of NADH or other reductants, ascorbate addition, or deproteination of the cell wall abolishing the signal due to hydroxyl radicals. © 2005 New York Academy of Sciences.
Marković, D M; Marković, D A
The relationship between some meteorological parameters and the tropospheric concentrations of ozone in the urban area of Belgrade Journal Article
In: Journal of the Serbian Chemical Society, vol. 70, no. 12, pp. 1487-1495, 2005.
@article{Marković20051487,
title = {The relationship between some meteorological parameters and the tropospheric concentrations of ozone in the urban area of Belgrade},
author = {D M Marković and D A Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-31544444177&doi=10.2298%2fJSC0512487M&partnerID=40&md5=367a68b1ed7518680a9e5394cbc330f1},
doi = {10.2298/JSC0512487M},
year = {2005},
date = {2005-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {70},
number = {12},
pages = {1487-1495},
abstract = {During the period between June and December 2002, the concentrations of ozone in the air at 4 measuring sites in Belgrade were measured. The measuring periods varied from 10 days to several weeks. The maximal measured daily concentrations of ozone ranged from 19 ppbv (23 December 2002) to 118 ppbv (23 June 2002). Ozone concentrations higher than, or equal to 90 ppbv were registered at three measuring sites. It was shown that at measuring sites characterized as urban, maximal O 3 concentrations equal to, or higher than 90 ppbv occurred at high temperatures (higher than 30°C) and low wind speeds (mostly from the north). The measured ozone concentrations mostly showed characteristics usual for a daily photochemical ozone cycle, excluding the specificities influenced by the measuring site itself. Ozone transport was recorded at increased wind speeds, primarily from south-easterly directions. On the basis of he correlations between ozone concentration and the corresponding meteorological parameters, a validation of the measuring sites was performed from the aspect of their representativeness for the measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
During the period between June and December 2002, the concentrations of ozone in the air at 4 measuring sites in Belgrade were measured. The measuring periods varied from 10 days to several weeks. The maximal measured daily concentrations of ozone ranged from 19 ppbv (23 December 2002) to 118 ppbv (23 June 2002). Ozone concentrations higher than, or equal to 90 ppbv were registered at three measuring sites. It was shown that at measuring sites characterized as urban, maximal O 3 concentrations equal to, or higher than 90 ppbv occurred at high temperatures (higher than 30°C) and low wind speeds (mostly from the north). The measured ozone concentrations mostly showed characteristics usual for a daily photochemical ozone cycle, excluding the specificities influenced by the measuring site itself. Ozone transport was recorded at increased wind speeds, primarily from south-easterly directions. On the basis of he correlations between ozone concentration and the corresponding meteorological parameters, a validation of the measuring sites was performed from the aspect of their representativeness for the measurements.
Mladenović, M; Perić, M; Engels, B
An ab initio study of the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π electronic state of NCO Journal Article
In: Journal of Chemical Physics, vol. 122, no. 14, 2005.
@article{Mladenović2005c,
title = {An ab initio study of the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π electronic state of NCO},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844442148&doi=10.1063%2f1.1876072&partnerID=40&md5=305a684efdc65514fdaaca45a5726231},
doi = {10.1063/1.1876072},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Physics},
volume = {122},
number = {14},
abstract = {In the present study we give the results of the ab initio calculations on the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π u 2 electronic state of the NCO radical. The calculations of the potential surfaces and the electronic mean values of the hyperfine coupling constants are carried out by means of the density functional theory approach (B3LYP functional combined with an atomic orbital basis set suitable for calculations of the hyperfine structure). The vibronic levels, spin-orbit splitting, and the vibronic mean values of the components of the hyperfine tensor in the vibronic species are calculated using a variational method. The results of the calculations are in good agreement with the available experimental data. © 2005 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the present study we give the results of the ab initio calculations on the vibronic, spin-orbit, and magnetic hyperfine structure in the X 2 Π u 2 electronic state of the NCO radical. The calculations of the potential surfaces and the electronic mean values of the hyperfine coupling constants are carried out by means of the density functional theory approach (B3LYP functional combined with an atomic orbital basis set suitable for calculations of the hyperfine structure). The vibronic levels, spin-orbit splitting, and the vibronic mean values of the components of the hyperfine tensor in the vibronic species are calculated using a variational method. The results of the calculations are in good agreement with the available experimental data. © 2005 American Institute of Physics.
Popović-Bijelić, A; Bijelić, G; Jorgovanović, N; Bojanić, D; Popović, M B; Popović, D B
Multi-field surface electrode for selective electrical stimulation Journal Article
In: Artificial Organs, vol. 29, no. 6, pp. 448-452, 2005.
@article{Popović-Bijelić2005448,
title = {Multi-field surface electrode for selective electrical stimulation},
author = {A Popović-Bijelić and G Bijelić and N Jorgovanović and D Bojanić and M B Popović and D B Popović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24944440860&doi=10.1111%2fj.1525-1594.2005.29075.x&partnerID=40&md5=8b290eb088cf71b50e29b37f7824f363},
doi = {10.1111/j.1525-1594.2005.29075.x},
year = {2005},
date = {2005-01-01},
journal = {Artificial Organs},
volume = {29},
number = {6},
pages = {448-452},
abstract = {We designed a 24-field array and an on-line control box that selects which and how many of 24 fields will conduct electrical charge during functional electrical stimulation. The array was made using a conductive microfiber textile, silver two-component adhesive, and the conductive ink imprint on the polycarbonate. The control box comprised 24 switches that corresponded one-to-one to the fields on the array. Each field could be made conductive or nonconductive by simple pressing of the corresponding push-button type switch on the control box. We present here representative results of the selectivity of the new electrode measured in three tetraplegic patients during functional electrical stimulation of the forearm. The task was to generate finger flexion and extension with minimal interference of the wrist movement during lateral and palmar grasps. Therapists determined the appropriate pattern that lead to effective grasping, lasting on average 5 min per stimulation channel in the first session. This optimal conductive pattern (size and shape) provided effective finger flexion and extension with minimal wrist flexion/extension and ulnar/radial deviations (<10 degrees). The optimal size and shape of the electrode in all cases had a branched pattern. The selection of the optimal stimulation site was achieved without moving the electrode. The size and shape were reproducible in the same subject from session to session, yet were different from subject to subject. The optimal electrode size and shape changed when subjects pronated and supinated their forearm. The control box includes a program that can dynamically change the number and sites of the conductive fields; hence, it is feasible to use this during functional movements. Subjects learned how to determine the optimal electrode pattern; hence, these electrodes could be effective for home usage. © 2005 International Center for Artificial Organs and Transplantation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We designed a 24-field array and an on-line control box that selects which and how many of 24 fields will conduct electrical charge during functional electrical stimulation. The array was made using a conductive microfiber textile, silver two-component adhesive, and the conductive ink imprint on the polycarbonate. The control box comprised 24 switches that corresponded one-to-one to the fields on the array. Each field could be made conductive or nonconductive by simple pressing of the corresponding push-button type switch on the control box. We present here representative results of the selectivity of the new electrode measured in three tetraplegic patients during functional electrical stimulation of the forearm. The task was to generate finger flexion and extension with minimal interference of the wrist movement during lateral and palmar grasps. Therapists determined the appropriate pattern that lead to effective grasping, lasting on average 5 min per stimulation channel in the first session. This optimal conductive pattern (size and shape) provided effective finger flexion and extension with minimal wrist flexion/extension and ulnar/radial deviations (<10 degrees). The optimal size and shape of the electrode in all cases had a branched pattern. The selection of the optimal stimulation site was achieved without moving the electrode. The size and shape were reproducible in the same subject from session to session, yet were different from subject to subject. The optimal electrode size and shape changed when subjects pronated and supinated their forearm. The control box includes a program that can dynamically change the number and sites of the conductive fields; hence, it is feasible to use this during functional movements. Subjects learned how to determine the optimal electrode pattern; hence, these electrodes could be effective for home usage. © 2005 International Center for Artificial Organs and Transplantation.
Spasojević, I; Maksimović, V; Zakrzewska, J; Bačić, G
Effects of 5-fluorouracil on erythrocytes in relation to its cardiotoxicity: Membrane structure and functioning Journal Article
In: Journal of Chemical Information and Modeling, vol. 45, no. 6, pp. 1680-1685, 2005.
@article{Spasojević20051680,
title = {Effects of 5-fluorouracil on erythrocytes in relation to its cardiotoxicity: Membrane structure and functioning},
author = {I Spasojević and V Maksimović and J Zakrzewska and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28944432545&doi=10.1021%2fci0501746&partnerID=40&md5=b735364fdebc4178f3aa3fa2a9f61261},
doi = {10.1021/ci0501746},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Information and Modeling},
volume = {45},
number = {6},
pages = {1680-1685},
abstract = {In the present study, we showed that the antineoplastic drug 5-fluorouracil (5-FU) induces in vitro exposure-time/dose-dependent changes on the level of an erythrocyte's morphology, ionic balance, and membrane fluidity. These changes are partially or fully irreversible, and we suggest that they are provoked by an irreversible depletion of ATP. Because of these changes that could also occur in vivo during 5-FU infusion, a certain amount of erythrocytes with echinocytic shape and diminished ability to deliver oxygen is present in blood for longer periods of time. This renders oxygen transport and delivery more difficult, leaving the heart with an insufficient supply of oxygen, thus leading to cardiotoxicity. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the present study, we showed that the antineoplastic drug 5-fluorouracil (5-FU) induces in vitro exposure-time/dose-dependent changes on the level of an erythrocyte's morphology, ionic balance, and membrane fluidity. These changes are partially or fully irreversible, and we suggest that they are provoked by an irreversible depletion of ATP. Because of these changes that could also occur in vivo during 5-FU infusion, a certain amount of erythrocytes with echinocytic shape and diminished ability to deliver oxygen is present in blood for longer periods of time. This renders oxygen transport and delivery more difficult, leaving the heart with an insufficient supply of oxygen, thus leading to cardiotoxicity. © 2005 American Chemical Society.
Radotić, K; Mićić, M; Jeremić, M
New insights into the structural organization of the plant polymer lignin Journal Article
In: Annals of the New York Academy of Sciences, vol. 1048, pp. 215-229, 2005.
@article{Radotić2005215,
title = {New insights into the structural organization of the plant polymer lignin},
author = {K Radotić and M Mićić and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-25144465443&doi=10.1196%2fannals.1342.020&partnerID=40&md5=c861743c59017bbddd704bdac001d7de},
doi = {10.1196/annals.1342.020},
year = {2005},
date = {2005-01-01},
journal = {Annals of the New York Academy of Sciences},
volume = {1048},
pages = {215-229},
abstract = {The organizational features of lignin structure and the mechanism of its synthesis have significant implications for the response of the plant to stress. It was unknown whether the enzymic formation of lignin in the cell wall is an uncontrolled process or finely regulated in time and space. In vitro scanning tunneling microscopy (STM), atomic force microscopies (AFM), near-field scanning optical microscopy (NSOM). and the novel environmental scanning electron microscopy (ESEM) imaging studies of the lignin model compounds have directly shown its highly ordered structure and elucidated its modular and fractal organization. Direct evidence was presented for the existence of strong intermolecular forces responsible for holding lignin globules together in highly ordered structures. Fractal analysis was applied as a theoretical approach, to show regularity and modular organization of lignin. Surface chemistry studies of the lignin monolayer reveal intrinsic properties that may be a key to osmotic pressure and cell size control mechanism in the higher plant cells. The obtained data contribute to the explanation of the mechanisms of cell wall synthesis in vivo. © 2005 New York Academy of Sciences.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The organizational features of lignin structure and the mechanism of its synthesis have significant implications for the response of the plant to stress. It was unknown whether the enzymic formation of lignin in the cell wall is an uncontrolled process or finely regulated in time and space. In vitro scanning tunneling microscopy (STM), atomic force microscopies (AFM), near-field scanning optical microscopy (NSOM). and the novel environmental scanning electron microscopy (ESEM) imaging studies of the lignin model compounds have directly shown its highly ordered structure and elucidated its modular and fractal organization. Direct evidence was presented for the existence of strong intermolecular forces responsible for holding lignin globules together in highly ordered structures. Fractal analysis was applied as a theoretical approach, to show regularity and modular organization of lignin. Surface chemistry studies of the lignin monolayer reveal intrinsic properties that may be a key to osmotic pressure and cell size control mechanism in the higher plant cells. The obtained data contribute to the explanation of the mechanisms of cell wall synthesis in vivo. © 2005 New York Academy of Sciences.