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FFH scientific research papers database
FFH database search (1991-2022):
1641.
Kosanić, M; Kapetanović, V; Milovanović, L; Burić, N; Veselinovic, D
Potentiometric and Spectrophotometric Determination of the Dissociation Constants of Cefetamet Journal Article
In: Monatshefte fur Chemie, vol. 128, no. 2, pp. 137-146, 1997.
@article{Kosanić1997137,
title = {Potentiometric and Spectrophotometric Determination of the Dissociation Constants of Cefetamet},
author = {M Kosanić and V Kapetanović and L Milovanović and N Burić and D Veselinovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031522552&doi=10.1007%2fBF00807302&partnerID=40&md5=371371b7ccf35a2c2092031d3080616a},
doi = {10.1007/BF00807302},
year = {1997},
date = {1997-01-01},
journal = {Monatshefte fur Chemie},
volume = {128},
number = {2},
pages = {137-146},
abstract = {The dissociation constants of cefetamet-Na have been determined using potentiometric titrations and spectrophotometry. The investigations were carried on in water solutions at constant temperature and ionic strength, and at different H0 and pH values. Potentiometric investigations were performed at three different temperatures and ionic strengths. The concentration dissociation constants and the corresponding thermodynamic dissociation constants were calculated by a computer program. The mixed dissociation constants (pK1) of cefetamet-Na have been determined spectrophotometrically in the H0 range from -5.80 to 0.00 and at pH values from 0.00 to 12.70 and are in good agreement with values achieved by graphical methods as well as with those obtained by potentiometric methods. Based on the determined values, the thermodynamic parameters (ΔG, ΔH, ΔS) were calculated at I = 0.1 M.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The dissociation constants of cefetamet-Na have been determined using potentiometric titrations and spectrophotometry. The investigations were carried on in water solutions at constant temperature and ionic strength, and at different H0 and pH values. Potentiometric investigations were performed at three different temperatures and ionic strengths. The concentration dissociation constants and the corresponding thermodynamic dissociation constants were calculated by a computer program. The mixed dissociation constants (pK1) of cefetamet-Na have been determined spectrophotometrically in the H0 range from -5.80 to 0.00 and at pH values from 0.00 to 12.70 and are in good agreement with values achieved by graphical methods as well as with those obtained by potentiometric methods. Based on the determined values, the thermodynamic parameters (ΔG, ΔH, ΔS) were calculated at I = 0.1 M.
1642.
Vidić, J; Sužnjević, D; Erceg, M; Vučelić, D
Binding of toxic cations to ferritin Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 11, pp. 1077-1085, 1997.
@article{Vidić19971077,
title = {Binding of toxic cations to ferritin},
author = {J Vidić and D Sužnjević and M Erceg and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040681717&partnerID=40&md5=9a5d9f2b9094df0937405b5add31dfae},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {11},
pages = {1077-1085},
abstract = {Electrochemical studies of metalloproteins have a considerable potential in the investigation of the structure of metal-protein complexes, particularly in view of the heavy metal pollution effect. In this paper, data obtained by differential pulse polarography (d.p.p.) using a dropping mercury electrode (DME) are presented, with regard to the specific interaction of ferritin with Cd 2+ , Al 3+ and Pb 2+ from citrate buffer, pH 6.3. It is possible to more clearly observe the obtained peak current of Pb 2+ on the d.p.p. curve after its binding to ferritin after digestion of the protein coat by trypsin, suggesting that the Pb 2+ ions are probably associated with the protein core. However, the binding affinity of Cd 2+ to ferritin is not high because the bound Cd 2+ ions can be easily removed as Cd-citrate or as the more stable Cd-EDTA complex. It was also found that Al 3+ ions bind rather strongly to ferritin, probably due to the association with ferric ions present in the protein core.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical studies of metalloproteins have a considerable potential in the investigation of the structure of metal-protein complexes, particularly in view of the heavy metal pollution effect. In this paper, data obtained by differential pulse polarography (d.p.p.) using a dropping mercury electrode (DME) are presented, with regard to the specific interaction of ferritin with Cd 2+ , Al 3+ and Pb 2+ from citrate buffer, pH 6.3. It is possible to more clearly observe the obtained peak current of Pb 2+ on the d.p.p. curve after its binding to ferritin after digestion of the protein coat by trypsin, suggesting that the Pb 2+ ions are probably associated with the protein core. However, the binding affinity of Cd 2+ to ferritin is not high because the bound Cd 2+ ions can be easily removed as Cd-citrate or as the more stable Cd-EDTA complex. It was also found that Al 3+ ions bind rather strongly to ferritin, probably due to the association with ferric ions present in the protein core.
1643.
Kremenović, A; Norby, P; Dimitrijević, R; Dondur, V
Time-temperature resolved synchrotron XRPD study of the hexacelsian α↔β polymorph inversion Journal Article
In: Solid State Ionics, vol. 101-103, no. PART 1, pp. 611-618, 1997.
@article{Kremenović1997611,
title = {Time-temperature resolved synchrotron XRPD study of the hexacelsian α↔β polymorph inversion},
author = {A Kremenović and P Norby and R Dimitrijević and V Dondur},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031269864&partnerID=40&md5=fd987b5dac30883ebc491ec87d192b80},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {101-103},
number = {PART 1},
pages = {611-618},
abstract = {Stoichiometric α-hexacelsianLTA and non-stoichiometric α-hexacelsianFAU phases were synthesized by the method of high-temperature induced transformation of Ba-exchanged LTA and FAU zeolites. The unit cell thermal expansion properties were followed using synchrotron X-ray Powder Diffraction (XRPD) data in the temperature range between 25 °C and 700 °C. Both samples exhibit normal thermal behavior with all unit cell axes expanding upon heating. The expansion properties of the unit cell volumes are similar in the temperature range between 25 °C and 325 °C. At 325 °C the unit cell volume of the α-hexacelsianLTA phase increases. This is caused by structural inversion to the β-hexacelsianLTA phase. The thermal expansion of the unit cell of the α-hexacelsianFAU phase does not show any discontinuities. The distinct unit cell volume properties observed upon heating at 325 °C, are consistent with results of DSC measurements of α-hexacelsianLTA and α-hexacelsianFAU samples. The crystal structures of the α-(at 25 °C) and β-forms (at 362 °C) of Si, Al ordered hexacelsianLTA and disordered hexacelsianFAU phases, were refined in the trigonal space group P-3 (147), from synchrotron XRPD data by the Rietveld method. These structures were refined with agreement factors: Rwp = 6.19},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Stoichiometric α-hexacelsianLTA and non-stoichiometric α-hexacelsianFAU phases were synthesized by the method of high-temperature induced transformation of Ba-exchanged LTA and FAU zeolites. The unit cell thermal expansion properties were followed using synchrotron X-ray Powder Diffraction (XRPD) data in the temperature range between 25 °C and 700 °C. Both samples exhibit normal thermal behavior with all unit cell axes expanding upon heating. The expansion properties of the unit cell volumes are similar in the temperature range between 25 °C and 325 °C. At 325 °C the unit cell volume of the α-hexacelsianLTA phase increases. This is caused by structural inversion to the β-hexacelsianLTA phase. The thermal expansion of the unit cell of the α-hexacelsianFAU phase does not show any discontinuities. The distinct unit cell volume properties observed upon heating at 325 °C, are consistent with results of DSC measurements of α-hexacelsianLTA and α-hexacelsianFAU samples. The crystal structures of the α-(at 25 °C) and β-forms (at 362 °C) of Si, Al ordered hexacelsianLTA and disordered hexacelsianFAU phases, were refined in the trigonal space group P-3 (147), from synchrotron XRPD data by the Rietveld method. These structures were refined with agreement factors: Rwp = 6.19
1644.
Bacic, G; Liu, K J; Goda, F; Hoopes, P J; Rosen, G M; Swartz, H M
MRI contrast enhanced study of cartilage proteoglycan degradation in the rabbit knee Journal Article
In: Magnetic Resonance in Medicine, vol. 37, no. 5, pp. 764-768, 1997.
@article{Bacic1997764,
title = {MRI contrast enhanced study of cartilage proteoglycan degradation in the rabbit knee},
author = {G Bacic and K J Liu and F Goda and P J Hoopes and G M Rosen and H M Swartz},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-8244252946&doi=10.1002%2fmrm.1910370520&partnerID=40&md5=fdff2ac470d445eb65c32882b8ea2373},
doi = {10.1002/mrm.1910370520},
year = {1997},
date = {1997-01-01},
journal = {Magnetic Resonance in Medicine},
volume = {37},
number = {5},
pages = {764-768},
abstract = {Early degeneration of cartilage is accompanied by a loss of proteoglycans and consequent changes in the content of water. Conventional magnetic resonance imaging (MRI) cannot reliably detect this change, since the relaxation properties of the cartilage are dominated by its collagen content. The applicability of a positively charged nitroxide as an MRI contrast agent in detection of the content of the negatively charged proteoglycans within the cartilage was investigated. The results from both MRI and electron paramagnetic resonance (EPR) spectroscopy indicate that the accumulation of the contrast agent reflects the amount of proteoglycans within the cartilage, presumably due to the electrostatic interactions between the negatively charged proteoglycans and the positively charged nitroxide. Such a contrast agent could be useful in the detection and study of early stages of the degeneration of joints.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Early degeneration of cartilage is accompanied by a loss of proteoglycans and consequent changes in the content of water. Conventional magnetic resonance imaging (MRI) cannot reliably detect this change, since the relaxation properties of the cartilage are dominated by its collagen content. The applicability of a positively charged nitroxide as an MRI contrast agent in detection of the content of the negatively charged proteoglycans within the cartilage was investigated. The results from both MRI and electron paramagnetic resonance (EPR) spectroscopy indicate that the accumulation of the contrast agent reflects the amount of proteoglycans within the cartilage, presumably due to the electrostatic interactions between the negatively charged proteoglycans and the positively charged nitroxide. Such a contrast agent could be useful in the detection and study of early stages of the degeneration of joints.
1645.
Raspopović, Z; Holclajtner-Antunović, I; Georgijević, V; Tripković, M
Calculation of the electron number density spatial distribution in the ICAP Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 745-753, 1996.
@article{Raspopović1996745,
title = {Calculation of the electron number density spatial distribution in the ICAP},
author = {Z Raspopović and I Holclajtner-Antunović and V Georgijević and M Tripković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030495896&partnerID=40&md5=a61ef62be7cc571f94d8d425958547bc},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {745-753},
abstract = {A computer simulation is used to calculate the spatial distributions of electron number density in inductively coupled argon plasma. The calculated and experimental results obtained for standard conditions in analytical atomic spectroscopy are compared with other authors' experimental results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A computer simulation is used to calculate the spatial distributions of electron number density in inductively coupled argon plasma. The calculated and experimental results obtained for standard conditions in analytical atomic spectroscopy are compared with other authors' experimental results.
1646.
Mioč, U B; Kuntić, V S; Nedić, Z P; Filipović, I M; Jelić, S B
Anticoagulant effect of tungstophosphoric acid salt studied by IR spectroscopy Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 767-771, 1996.
@article{Mioč1996767,
title = {Anticoagulant effect of tungstophosphoric acid salt studied by IR spectroscopy},
author = {U B Mioč and V S Kuntić and Z P Nedić and I M Filipović and S B Jelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030521327&partnerID=40&md5=813c78b3aada208869336d936e6f65ef},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {767-771},
abstract = {The influence of the Li and Na salts of 12-tungstophosphoric acid H3P W12O40(WPA) was tested for in vitro effects on blood coagulation. It was found that only Li3WPA shows anticoagulant effects, but compared with WPA activity, the activity of Li salt is diminished. IR spectroscopy was used to define the reaction between these salts, and coagulation proteins. The appearance of bands characteristic of oxonium ion (H3O+) in the IR spectra indicates blocking of the active center of the protein through a very strong hydrogen bond.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the Li and Na salts of 12-tungstophosphoric acid H3P W12O40(WPA) was tested for in vitro effects on blood coagulation. It was found that only Li3WPA shows anticoagulant effects, but compared with WPA activity, the activity of Li salt is diminished. IR spectroscopy was used to define the reaction between these salts, and coagulation proteins. The appearance of bands characteristic of oxonium ion (H3O+) in the IR spectra indicates blocking of the active center of the protein through a very strong hydrogen bond.
1647.
Vukojević, V; Sørensen, P G; Hynne, F
Predictive value of a model of the Briggs-Rauscher reaction fitted to quenching experiments Journal Article
In: Journal of Physical Chemistry, vol. 100, no. 43, pp. 17175-17185, 1996.
@article{Vukojević199617175,
title = {Predictive value of a model of the Briggs-Rauscher reaction fitted to quenching experiments},
author = {V Vukojević and P G Sørensen and F Hynne},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001517437&doi=10.1021%2fjp960785o&partnerID=40&md5=636c61ee2c3046e74ee81d82c7af4877},
doi = {10.1021/jp960785o},
year = {1996},
date = {1996-01-01},
journal = {Journal of Physical Chemistry},
volume = {100},
number = {43},
pages = {17175-17185},
abstract = {We describe a model of the Briggs-Rauscher reaction closely related to those due to Furrow and Noyes and to DeKepper and Epstein. The model has been fitted to 16 experimental basic quenching parameters at a Hopf bifurcation point. The fit is quite good. Predictions of the model are compared with experiments close to the Hopf bifurcation as well as at several operating points away from it and with experiments under batch conditions. The angular frequency of the finite limit cycle oscillations near the Hopf bifurcation is half the value observed in the experiments. The relative phases of the concentration oscillations of O2 and I- agree reasonably well with the experiments, but the average values are 1 or 2 orders of magnitude smaller in the simulations. The model demonstrates that it is possible to account for a paradoxical behavior of perturbation by OH- as compared to that of H+ and that quenching from a finite limit cycle may be impossible to realize. It qualitatively explains four distinct quenching experiments by dilution. At three separate operation points away from the Hopf bifurcation the model reproduces two observed patterns, namely, one of bistability between a stationary state and a limit cycle and one of mixed mode oscillations, but it fails to reproduce observed burst oscillations at the appropriate point. The model can reproduce transient batch mode oscillations and other transient behavior. The model of Furrow and Noyes with a more recent set of rate constants and a reduced version of it, derived by sensitivity analysis, are also compared with experiments. © 1996 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We describe a model of the Briggs-Rauscher reaction closely related to those due to Furrow and Noyes and to DeKepper and Epstein. The model has been fitted to 16 experimental basic quenching parameters at a Hopf bifurcation point. The fit is quite good. Predictions of the model are compared with experiments close to the Hopf bifurcation as well as at several operating points away from it and with experiments under batch conditions. The angular frequency of the finite limit cycle oscillations near the Hopf bifurcation is half the value observed in the experiments. The relative phases of the concentration oscillations of O2 and I- agree reasonably well with the experiments, but the average values are 1 or 2 orders of magnitude smaller in the simulations. The model demonstrates that it is possible to account for a paradoxical behavior of perturbation by OH- as compared to that of H+ and that quenching from a finite limit cycle may be impossible to realize. It qualitatively explains four distinct quenching experiments by dilution. At three separate operation points away from the Hopf bifurcation the model reproduces two observed patterns, namely, one of bistability between a stationary state and a limit cycle and one of mixed mode oscillations, but it fails to reproduce observed burst oscillations at the appropriate point. The model can reproduce transient batch mode oscillations and other transient behavior. The model of Furrow and Noyes with a more recent set of rate constants and a reduced version of it, derived by sensitivity analysis, are also compared with experiments. © 1996 American Chemical Society.
1648.
Engels, B; Suter, H U; Perić, M
Ab initio investigation of vibrational effects on magnetic hyperfine coupling constants in the X3Σg - state of B2H2 Journal Article
In: Journal of Physical Chemistry, vol. 100, no. 24, pp. 10121-10122, 1996.
@article{Engels199610121,
title = {Ab initio investigation of vibrational effects on magnetic hyperfine coupling constants in the X3Σg - state of B2H2},
author = {B Engels and H U Suter and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0011028105&partnerID=40&md5=cfbfea872c77cf630d3c85e991f0188c},
year = {1996},
date = {1996-01-01},
journal = {Journal of Physical Chemistry},
volume = {100},
number = {24},
pages = {10121-10122},
abstract = {The influence of the vibrational motion on the magnetic hyperfine coupling constants (hfcc's) in the X3Σg - of B2H2 is investigated by means of ab initio methods. The present study clearly shows that for the isotropic hfcc's of the boron centers the incorporation of the vibrational effects is essential already for the vibrational ground state. For the boron center the isotropic hfcc's calculated for the lowest vibrational state (Aiso(11B) = -5.2 MHz) differ considerably from the value obtained at the equilibrium geometry (Aiso(11B) = -14.0 MHz) but agrees excellently with the experimental value (Aiso(11B) = -5.2 MHz) obtained previously. For the hydrogen centers and for all anisotropic hfcc's the effects are found to be much smaller. In the present study the averaged values for various vibrational states and isotopic effects are given. © 1996 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the vibrational motion on the magnetic hyperfine coupling constants (hfcc's) in the X3Σg - of B2H2 is investigated by means of ab initio methods. The present study clearly shows that for the isotropic hfcc's of the boron centers the incorporation of the vibrational effects is essential already for the vibrational ground state. For the boron center the isotropic hfcc's calculated for the lowest vibrational state (Aiso(11B) = -5.2 MHz) differ considerably from the value obtained at the equilibrium geometry (Aiso(11B) = -14.0 MHz) but agrees excellently with the experimental value (Aiso(11B) = -5.2 MHz) obtained previously. For the hydrogen centers and for all anisotropic hfcc's the effects are found to be much smaller. In the present study the averaged values for various vibrational states and isotopic effects are given. © 1996 American Chemical Society.
1649.
Anić, S; Kolar-Anić, L
The Bray-Liebhafsky reaction. VI. Kinetics in iodide oscillations Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 10, pp. 887-891, 1996.
@article{Anić1996887,
title = {The Bray-Liebhafsky reaction. VI. Kinetics in iodide oscillations},
author = {S Anić and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030520321&partnerID=40&md5=66024c873812cc4f79834cb7d5826f5f},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {10},
pages = {887-891},
abstract = {The rate constants and activation energies of the dominant reactions in characteristic kinetic branches of iodide oscilations in the Bray-Liebhafsky system arc determined. In the part of the phase space considered the decisive role of nonradical processes in the appearance of oscillations is suggested.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The rate constants and activation energies of the dominant reactions in characteristic kinetic branches of iodide oscilations in the Bray-Liebhafsky system arc determined. In the part of the phase space considered the decisive role of nonradical processes in the appearance of oscillations is suggested.
1650.
Ostojić, B D
Ab initio investigation of the electronic spectrum of the BH radical Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 12, pp. 1165-1177, 1996.
@article{Ostojić19961165,
title = {Ab initio investigation of the electronic spectrum of the BH radical},
author = {B D Ostojić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030376180&partnerID=40&md5=2ba6d279fb94079e30d1cd8c42fb78e9},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {12},
pages = {1165-1177},
abstract = {Potential energy curves for the low-lying singlet and triplet electronic states of the BH radical and the interaction between valence- and Rydberg-type species are studied by means of the ab initio MRD-Cl method. The vertical electronic spectrum of BH is investigated. Vibrational analysis of the most interesting states is undertaken. Comparison is made with available experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Potential energy curves for the low-lying singlet and triplet electronic states of the BH radical and the interaction between valence- and Rydberg-type species are studied by means of the ab initio MRD-Cl method. The vertical electronic spectrum of BH is investigated. Vibrational analysis of the most interesting states is undertaken. Comparison is made with available experimental data.
1651.
Petranović, N; Minić, D
Metal phases in zeolite matrix: Electric and electrochemical properties Journal Article
In: Ceramics International, vol. 22, no. 4, pp. 317-320, 1996.
@article{Petranović1996317,
title = {Metal phases in zeolite matrix: Electric and electrochemical properties},
author = {N Petranović and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029719182&doi=10.1016%2f0272-8842%2895%2900110-7&partnerID=40&md5=e106f69baf8e4d03a086feb89ae57524},
doi = {10.1016/0272-8842(95)00110-7},
year = {1996},
date = {1996-01-01},
journal = {Ceramics International},
volume = {22},
number = {4},
pages = {317-320},
abstract = {Thermal vacuum activation of hydrated silver zeolite forms leads to silver clusters formation in zeolite framework. The change in electrical conductivity of the Ag form of zeolites is a direct consequence of the appearance and formation of clusters. The electrochemical behaviour of samples points to the presence of several kinds of silver particles and also to their different location, inside and outside the zeolite. Electric and electrochemical measurements can be of practical importance in the investigation of metal clusters in zeolite structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal vacuum activation of hydrated silver zeolite forms leads to silver clusters formation in zeolite framework. The change in electrical conductivity of the Ag form of zeolites is a direct consequence of the appearance and formation of clusters. The electrochemical behaviour of samples points to the presence of several kinds of silver particles and also to their different location, inside and outside the zeolite. Electric and electrochemical measurements can be of practical importance in the investigation of metal clusters in zeolite structures.
1652.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric study of anthocyan copigmentation reactions Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 44, no. 5, pp. 1333-1336, 1996.
@article{Baranac19961333,
title = {Spectrophotometric study of anthocyan copigmentation reactions},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000351643&doi=10.1021%2fjf950420l&partnerID=40&md5=165cfc54a42c781bb622ba9e1f567084},
doi = {10.1021/jf950420l},
year = {1996},
date = {1996-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {44},
number = {5},
pages = {1333-1336},
abstract = {The reaction of malvin. chloride (malvidin 3,5-diglucoside) with a flavonoid compound rutin (quercetin 3-rutinoside) is investigated. Reactions of these molecules are observed through UV-vis absorption spectra, to identify the factors that influence the copigmentation as well as the characteristics of the copigment formed. It is established that the copigmentation process takes place in buffer solutions at a specific pH value and that it is conditioned by the mole ratio and temperature. Copigment formation is defined by kinetic and thermodynamic parameters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The reaction of malvin. chloride (malvidin 3,5-diglucoside) with a flavonoid compound rutin (quercetin 3-rutinoside) is investigated. Reactions of these molecules are observed through UV-vis absorption spectra, to identify the factors that influence the copigmentation as well as the characteristics of the copigment formed. It is established that the copigmentation process takes place in buffer solutions at a specific pH value and that it is conditioned by the mole ratio and temperature. Copigment formation is defined by kinetic and thermodynamic parameters.
1653.
Minic, D; Petkovic, J; Koricanac, Z; Jovanovic, T
Spectrophotometric determination of nizatidine in pharmaceutical preparations Journal Article
In: Journal of Pharmaceutical and Biomedical Analysis, vol. 14, no. 8-10, pp. 1355-1358, 1996.
@article{Minic19961355,
title = {Spectrophotometric determination of nizatidine in pharmaceutical preparations},
author = {D Minic and J Petkovic and Z Koricanac and T Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030176376&doi=10.1016%2fS0731-7085%2896%2901771-2&partnerID=40&md5=b3df9795f96fefef7065a42ec270b5d3},
doi = {10.1016/S0731-7085(96)01771-2},
year = {1996},
date = {1996-01-01},
journal = {Journal of Pharmaceutical and Biomedical Analysis},
volume = {14},
number = {8-10},
pages = {1355-1358},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1654.
Bogunović, L J; Mioč, U B; Ribnikar, S V; Stanisavljev, B R
Hydrogen-bonded complexes of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and ketones Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 755-758, 1996.
@article{Bogunović1996755,
title = {Hydrogen-bonded complexes of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and ketones},
author = {L J Bogunović and U B Mioč and S V Ribnikar and B R Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042357641&partnerID=40&md5=2ac449cc771d1afde636f84c7ac744ef},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {755-758},
abstract = {The interaction by hydrogen bond formation of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and acetone was investigated in CCl 4 by means of IR spectroscopy. Equilibrium constants and enthalpies of complex formation were determined. The dependence of the spectroscopic parameters, equilibrium constants and enthalpies of complex formation on the proton donating and proton accepting power of the interacting carbinol and ether are discussed. The results are compared with those of earlier sudies on the complexes of trimethylcarbinol with ketones and ethers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The interaction by hydrogen bond formation of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and acetone was investigated in CCl 4 by means of IR spectroscopy. Equilibrium constants and enthalpies of complex formation were determined. The dependence of the spectroscopic parameters, equilibrium constants and enthalpies of complex formation on the proton donating and proton accepting power of the interacting carbinol and ether are discussed. The results are compared with those of earlier sudies on the complexes of trimethylcarbinol with ketones and ethers.
1655.
Dondur, V; Petranovic, N; Dimitrijevic, R
High temperature phase transformations of cation exchanged zeolites: A new route for synthesis of aluminosilicate materials Journal Article
In: Materials Science Forum, vol. 214, pp. 91-98, 1996.
@article{Dondur199691,
title = {High temperature phase transformations of cation exchanged zeolites: A new route for synthesis of aluminosilicate materials},
author = {V Dondur and N Petranovic and R Dimitrijevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029725790&partnerID=40&md5=fb73e0f0fb1e6bb19db587fee7718018},
year = {1996},
date = {1996-01-01},
journal = {Materials Science Forum},
volume = {214},
pages = {91-98},
abstract = {Thermal conversion of zeolites (LTA, SOD, TAU, and GIS) exchanged with monovalent counter ions (Li + , Na + , K + , Rb + , Cs + , NH 4 + , Ag + , and Tl + ) is investigated from ambient temperature to 1400°C The new aluminosilicate phases such as α-eucryplite, Ag-carnegieite as well as KAlSiO 4 -ANA and CsAlSiO 4 -ANA are synthesized by this treatment. The mechanisms of phase transformations are elucidated by X-ray, DTA/DSC, and 29 Si and 27 Al MAS NMR methods. The temperature dependent electric conductivity measurements show that synthesized Ag-carnegieite possesses superionic characteristics whereas β-eucryptite can be classified as a good ionic conductor.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal conversion of zeolites (LTA, SOD, TAU, and GIS) exchanged with monovalent counter ions (Li + , Na + , K + , Rb + , Cs + , NH 4 + , Ag + , and Tl + ) is investigated from ambient temperature to 1400°C The new aluminosilicate phases such as α-eucryplite, Ag-carnegieite as well as KAlSiO 4 -ANA and CsAlSiO 4 -ANA are synthesized by this treatment. The mechanisms of phase transformations are elucidated by X-ray, DTA/DSC, and 29 Si and 27 Al MAS NMR methods. The temperature dependent electric conductivity measurements show that synthesized Ag-carnegieite possesses superionic characteristics whereas β-eucryptite can be classified as a good ionic conductor.
1656.
Čupić, Z; Anić, S; Mišljenović, D
The Bray-Liebhafsky reaction. VII. Concentrations of the external species H + and IO3 - Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 10, pp. 893-902, 1996.
@article{Čupić1996893,
title = {The Bray-Liebhafsky reaction. VII. Concentrations of the external species H + and IO3 -},
author = {Z Čupić and S Anić and D Mišljenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030493064&partnerID=40&md5=0a7af9caa4a49fa7d15dd20604a428ae},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {10},
pages = {893-902},
abstract = {A procedure to evaluate pseudo-equilibrium concentrations of hydrogen and iodatc ions, the two ionic species important in the Bray-Liebhafsky oscillatory system, is considered. The values of the concentrations arc found to be predominantly determined by the equilibrium dissociation reactions of sulphuric and iodic acids, and much less by the dimerization of the iodate ion.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A procedure to evaluate pseudo-equilibrium concentrations of hydrogen and iodatc ions, the two ionic species important in the Bray-Liebhafsky oscillatory system, is considered. The values of the concentrations arc found to be predominantly determined by the equilibrium dissociation reactions of sulphuric and iodic acids, and much less by the dimerization of the iodate ion.
1657.
Dimitrijević, R; Dondur, V; Kremenović, A
In: Zeolites, vol. 16, no. 4, pp. 294-300, 1996.
@article{Dimitrijević1996294,
title = {Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolite frameworks: Rietveld refinement of the hexagonal CaAl2Si2O8 diphyllosilicate structure},
author = {R Dimitrijević and V Dondur and A Kremenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001032335&doi=10.1016%2f0144-2449%2895%2900154-9&partnerID=40&md5=21c9b4e397d68cbbfb61aa93f0b32219},
doi = {10.1016/0144-2449(95)00154-9},
year = {1996},
date = {1996-01-01},
journal = {Zeolites},
volume = {16},
number = {4},
pages = {294-300},
abstract = {Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolites are followed in the range from room temperature to 1500°C. Both frameworks collapse into amorphous intermediate products after heating between 800 and 900°C. Prolonged heating of the intermediate product obtained from the Ca-LTA zeolite over 900°C induces recrystallization of CaAl2Si2O8 phases (hexagonal CaAl2Si2O8 phase and anorthite) into a mixture. The crystal structure of the hexagonal CaAl2Si2O8 phase [a0 = 5.1154 (Å)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolites are followed in the range from room temperature to 1500°C. Both frameworks collapse into amorphous intermediate products after heating between 800 and 900°C. Prolonged heating of the intermediate product obtained from the Ca-LTA zeolite over 900°C induces recrystallization of CaAl2Si2O8 phases (hexagonal CaAl2Si2O8 phase and anorthite) into a mixture. The crystal structure of the hexagonal CaAl2Si2O8 phase [a0 = 5.1154 (Å)
1658.
Gašić, M J; Zlatović, M; Ignjatović, L M; Putniković, B; Sladić, D
Improved electrochemical epoxidation of cholesterol and avarol dimethyl ether Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 11, pp. 1033-1037, 1996.
@article{Gašić19961033,
title = {Improved electrochemical epoxidation of cholesterol and avarol dimethyl ether},
author = {M J Gašić and M Zlatović and L M Ignjatović and B Putniković and D Sladić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-30244489166&partnerID=40&md5=2c2acaf3bec03ba5b6252f0aa0e578bd},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {11},
pages = {1033-1037},
abstract = {Electrochemical epoxidation of cholesterol and avarol dimethyl ether with bromide as heteromediator was performed, and its mechanism discussed. The influence of the solvent, the mediator concentration, and different electrolytic techniques on yield of the products was examined. Under optimal conditions, the yield of the cholesterol epoxides (5α,6α and 5β, 6β) was 88%, and of the corresponding epoxides of the avarol dimethyl ether 72%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical epoxidation of cholesterol and avarol dimethyl ether with bromide as heteromediator was performed, and its mechanism discussed. The influence of the solvent, the mediator concentration, and different electrolytic techniques on yield of the products was examined. Under optimal conditions, the yield of the cholesterol epoxides (5α,6α and 5β, 6β) was 88%, and of the corresponding epoxides of the avarol dimethyl ether 72%.
1659.
Davidovic, M; Mioc, U B
Heteropolyacids as protonic conductors Journal Article
In: Materials Science Forum, vol. 214, pp. 99-108, 1996.
@article{Davidovic199699,
title = {Heteropolyacids as protonic conductors},
author = {M Davidovic and U B Mioc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029745485&partnerID=40&md5=48e478a94e8146cb9b78af8b3417e44c},
year = {1996},
date = {1996-01-01},
journal = {Materials Science Forum},
volume = {214},
pages = {99-108},
abstract = {Protonic conductors belong to the conductors whose charge carriers are proton and protonic entities: H + , OH, H 2 O, [H(H 2 O)n] + . A small group of these compounds have exceptionally high proton conductivity. Heteropolyacids with respect to their conductivity of (1-100) x10 -3 Scm -1 belong to the superionic conductors at room temperature. They have pronounced catalytic properties. In order to understand the mechanism of conductivity it is necessary to study the structure and dynamic properties of protonic species as charge carriers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Protonic conductors belong to the conductors whose charge carriers are proton and protonic entities: H + , OH, H 2 O, [H(H 2 O)n] + . A small group of these compounds have exceptionally high proton conductivity. Heteropolyacids with respect to their conductivity of (1-100) x10 -3 Scm -1 belong to the superionic conductors at room temperature. They have pronounced catalytic properties. In order to understand the mechanism of conductivity it is necessary to study the structure and dynamic properties of protonic species as charge carriers.
1660.
Ignjatović, L M; Barek, J; Zima, J; Marković, D A
Adsorptive Stripping Voltammetric Determination of 1-(4′-Bromophenyl)-3,3-dimethyltriazene Journal Article
In: Mikrochimica Acta, vol. 122, no. 1-2, pp. 101-108, 1996.
@article{Ignjatović1996101,
title = {Adsorptive Stripping Voltammetric Determination of 1-(4′-Bromophenyl)-3,3-dimethyltriazene},
author = {L M Ignjatović and J Barek and J Zima and D A Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2042489861&partnerID=40&md5=7e93066e2fd2e8d8df11c4def3bbff66},
year = {1996},
date = {1996-01-01},
journal = {Mikrochimica Acta},
volume = {122},
number = {1-2},
pages = {101-108},
abstract = {The optimum conditions were established for the determination of the genotoxic substance 1-(4′-bromophenyl)-3,3-dimethyltriazene by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 × 10-4 to 1 × 10-7 mol dm-3. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substance on the surface of the hanging mercury drop electrode: differential pulse adsorptive stripping voltammetry can be used in the concentration range 1x10-7 to 2 × 10-10 mol dm-3. The relative standard deviation (for ten determinations at 2 × 10-10 mol dm-3) was 7.5%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The optimum conditions were established for the determination of the genotoxic substance 1-(4′-bromophenyl)-3,3-dimethyltriazene by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 × 10-4 to 1 × 10-7 mol dm-3. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substance on the surface of the hanging mercury drop electrode: differential pulse adsorptive stripping voltammetry can be used in the concentration range 1x10-7 to 2 × 10-10 mol dm-3. The relative standard deviation (for ten determinations at 2 × 10-10 mol dm-3) was 7.5%.
1997
Kosanić, M; Kapetanović, V; Milovanović, L; Burić, N; Veselinovic, D
Potentiometric and Spectrophotometric Determination of the Dissociation Constants of Cefetamet Journal Article
In: Monatshefte fur Chemie, vol. 128, no. 2, pp. 137-146, 1997.
@article{Kosanić1997137,
title = {Potentiometric and Spectrophotometric Determination of the Dissociation Constants of Cefetamet},
author = {M Kosanić and V Kapetanović and L Milovanović and N Burić and D Veselinovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031522552&doi=10.1007%2fBF00807302&partnerID=40&md5=371371b7ccf35a2c2092031d3080616a},
doi = {10.1007/BF00807302},
year = {1997},
date = {1997-01-01},
journal = {Monatshefte fur Chemie},
volume = {128},
number = {2},
pages = {137-146},
abstract = {The dissociation constants of cefetamet-Na have been determined using potentiometric titrations and spectrophotometry. The investigations were carried on in water solutions at constant temperature and ionic strength, and at different H0 and pH values. Potentiometric investigations were performed at three different temperatures and ionic strengths. The concentration dissociation constants and the corresponding thermodynamic dissociation constants were calculated by a computer program. The mixed dissociation constants (pK1) of cefetamet-Na have been determined spectrophotometrically in the H0 range from -5.80 to 0.00 and at pH values from 0.00 to 12.70 and are in good agreement with values achieved by graphical methods as well as with those obtained by potentiometric methods. Based on the determined values, the thermodynamic parameters (ΔG, ΔH, ΔS) were calculated at I = 0.1 M.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The dissociation constants of cefetamet-Na have been determined using potentiometric titrations and spectrophotometry. The investigations were carried on in water solutions at constant temperature and ionic strength, and at different H0 and pH values. Potentiometric investigations were performed at three different temperatures and ionic strengths. The concentration dissociation constants and the corresponding thermodynamic dissociation constants were calculated by a computer program. The mixed dissociation constants (pK1) of cefetamet-Na have been determined spectrophotometrically in the H0 range from -5.80 to 0.00 and at pH values from 0.00 to 12.70 and are in good agreement with values achieved by graphical methods as well as with those obtained by potentiometric methods. Based on the determined values, the thermodynamic parameters (ΔG, ΔH, ΔS) were calculated at I = 0.1 M.
Vidić, J; Sužnjević, D; Erceg, M; Vučelić, D
Binding of toxic cations to ferritin Journal Article
In: Journal of the Serbian Chemical Society, vol. 62, no. 11, pp. 1077-1085, 1997.
@article{Vidić19971077,
title = {Binding of toxic cations to ferritin},
author = {J Vidić and D Sužnjević and M Erceg and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0040681717&partnerID=40&md5=9a5d9f2b9094df0937405b5add31dfae},
year = {1997},
date = {1997-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {62},
number = {11},
pages = {1077-1085},
abstract = {Electrochemical studies of metalloproteins have a considerable potential in the investigation of the structure of metal-protein complexes, particularly in view of the heavy metal pollution effect. In this paper, data obtained by differential pulse polarography (d.p.p.) using a dropping mercury electrode (DME) are presented, with regard to the specific interaction of ferritin with Cd 2+ , Al 3+ and Pb 2+ from citrate buffer, pH 6.3. It is possible to more clearly observe the obtained peak current of Pb 2+ on the d.p.p. curve after its binding to ferritin after digestion of the protein coat by trypsin, suggesting that the Pb 2+ ions are probably associated with the protein core. However, the binding affinity of Cd 2+ to ferritin is not high because the bound Cd 2+ ions can be easily removed as Cd-citrate or as the more stable Cd-EDTA complex. It was also found that Al 3+ ions bind rather strongly to ferritin, probably due to the association with ferric ions present in the protein core.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical studies of metalloproteins have a considerable potential in the investigation of the structure of metal-protein complexes, particularly in view of the heavy metal pollution effect. In this paper, data obtained by differential pulse polarography (d.p.p.) using a dropping mercury electrode (DME) are presented, with regard to the specific interaction of ferritin with Cd 2+ , Al 3+ and Pb 2+ from citrate buffer, pH 6.3. It is possible to more clearly observe the obtained peak current of Pb 2+ on the d.p.p. curve after its binding to ferritin after digestion of the protein coat by trypsin, suggesting that the Pb 2+ ions are probably associated with the protein core. However, the binding affinity of Cd 2+ to ferritin is not high because the bound Cd 2+ ions can be easily removed as Cd-citrate or as the more stable Cd-EDTA complex. It was also found that Al 3+ ions bind rather strongly to ferritin, probably due to the association with ferric ions present in the protein core.
Kremenović, A; Norby, P; Dimitrijević, R; Dondur, V
Time-temperature resolved synchrotron XRPD study of the hexacelsian α↔β polymorph inversion Journal Article
In: Solid State Ionics, vol. 101-103, no. PART 1, pp. 611-618, 1997.
@article{Kremenović1997611,
title = {Time-temperature resolved synchrotron XRPD study of the hexacelsian α↔β polymorph inversion},
author = {A Kremenović and P Norby and R Dimitrijević and V Dondur},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0031269864&partnerID=40&md5=fd987b5dac30883ebc491ec87d192b80},
year = {1997},
date = {1997-01-01},
journal = {Solid State Ionics},
volume = {101-103},
number = {PART 1},
pages = {611-618},
abstract = {Stoichiometric α-hexacelsianLTA and non-stoichiometric α-hexacelsianFAU phases were synthesized by the method of high-temperature induced transformation of Ba-exchanged LTA and FAU zeolites. The unit cell thermal expansion properties were followed using synchrotron X-ray Powder Diffraction (XRPD) data in the temperature range between 25 °C and 700 °C. Both samples exhibit normal thermal behavior with all unit cell axes expanding upon heating. The expansion properties of the unit cell volumes are similar in the temperature range between 25 °C and 325 °C. At 325 °C the unit cell volume of the α-hexacelsianLTA phase increases. This is caused by structural inversion to the β-hexacelsianLTA phase. The thermal expansion of the unit cell of the α-hexacelsianFAU phase does not show any discontinuities. The distinct unit cell volume properties observed upon heating at 325 °C, are consistent with results of DSC measurements of α-hexacelsianLTA and α-hexacelsianFAU samples. The crystal structures of the α-(at 25 °C) and β-forms (at 362 °C) of Si, Al ordered hexacelsianLTA and disordered hexacelsianFAU phases, were refined in the trigonal space group P-3 (147), from synchrotron XRPD data by the Rietveld method. These structures were refined with agreement factors: Rwp = 6.19},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Stoichiometric α-hexacelsianLTA and non-stoichiometric α-hexacelsianFAU phases were synthesized by the method of high-temperature induced transformation of Ba-exchanged LTA and FAU zeolites. The unit cell thermal expansion properties were followed using synchrotron X-ray Powder Diffraction (XRPD) data in the temperature range between 25 °C and 700 °C. Both samples exhibit normal thermal behavior with all unit cell axes expanding upon heating. The expansion properties of the unit cell volumes are similar in the temperature range between 25 °C and 325 °C. At 325 °C the unit cell volume of the α-hexacelsianLTA phase increases. This is caused by structural inversion to the β-hexacelsianLTA phase. The thermal expansion of the unit cell of the α-hexacelsianFAU phase does not show any discontinuities. The distinct unit cell volume properties observed upon heating at 325 °C, are consistent with results of DSC measurements of α-hexacelsianLTA and α-hexacelsianFAU samples. The crystal structures of the α-(at 25 °C) and β-forms (at 362 °C) of Si, Al ordered hexacelsianLTA and disordered hexacelsianFAU phases, were refined in the trigonal space group P-3 (147), from synchrotron XRPD data by the Rietveld method. These structures were refined with agreement factors: Rwp = 6.19
Bacic, G; Liu, K J; Goda, F; Hoopes, P J; Rosen, G M; Swartz, H M
MRI contrast enhanced study of cartilage proteoglycan degradation in the rabbit knee Journal Article
In: Magnetic Resonance in Medicine, vol. 37, no. 5, pp. 764-768, 1997.
@article{Bacic1997764,
title = {MRI contrast enhanced study of cartilage proteoglycan degradation in the rabbit knee},
author = {G Bacic and K J Liu and F Goda and P J Hoopes and G M Rosen and H M Swartz},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-8244252946&doi=10.1002%2fmrm.1910370520&partnerID=40&md5=fdff2ac470d445eb65c32882b8ea2373},
doi = {10.1002/mrm.1910370520},
year = {1997},
date = {1997-01-01},
journal = {Magnetic Resonance in Medicine},
volume = {37},
number = {5},
pages = {764-768},
abstract = {Early degeneration of cartilage is accompanied by a loss of proteoglycans and consequent changes in the content of water. Conventional magnetic resonance imaging (MRI) cannot reliably detect this change, since the relaxation properties of the cartilage are dominated by its collagen content. The applicability of a positively charged nitroxide as an MRI contrast agent in detection of the content of the negatively charged proteoglycans within the cartilage was investigated. The results from both MRI and electron paramagnetic resonance (EPR) spectroscopy indicate that the accumulation of the contrast agent reflects the amount of proteoglycans within the cartilage, presumably due to the electrostatic interactions between the negatively charged proteoglycans and the positively charged nitroxide. Such a contrast agent could be useful in the detection and study of early stages of the degeneration of joints.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Early degeneration of cartilage is accompanied by a loss of proteoglycans and consequent changes in the content of water. Conventional magnetic resonance imaging (MRI) cannot reliably detect this change, since the relaxation properties of the cartilage are dominated by its collagen content. The applicability of a positively charged nitroxide as an MRI contrast agent in detection of the content of the negatively charged proteoglycans within the cartilage was investigated. The results from both MRI and electron paramagnetic resonance (EPR) spectroscopy indicate that the accumulation of the contrast agent reflects the amount of proteoglycans within the cartilage, presumably due to the electrostatic interactions between the negatively charged proteoglycans and the positively charged nitroxide. Such a contrast agent could be useful in the detection and study of early stages of the degeneration of joints.
1996
Raspopović, Z; Holclajtner-Antunović, I; Georgijević, V; Tripković, M
Calculation of the electron number density spatial distribution in the ICAP Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 745-753, 1996.
@article{Raspopović1996745,
title = {Calculation of the electron number density spatial distribution in the ICAP},
author = {Z Raspopović and I Holclajtner-Antunović and V Georgijević and M Tripković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030495896&partnerID=40&md5=a61ef62be7cc571f94d8d425958547bc},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {745-753},
abstract = {A computer simulation is used to calculate the spatial distributions of electron number density in inductively coupled argon plasma. The calculated and experimental results obtained for standard conditions in analytical atomic spectroscopy are compared with other authors' experimental results.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A computer simulation is used to calculate the spatial distributions of electron number density in inductively coupled argon plasma. The calculated and experimental results obtained for standard conditions in analytical atomic spectroscopy are compared with other authors' experimental results.
Mioč, U B; Kuntić, V S; Nedić, Z P; Filipović, I M; Jelić, S B
Anticoagulant effect of tungstophosphoric acid salt studied by IR spectroscopy Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 767-771, 1996.
@article{Mioč1996767,
title = {Anticoagulant effect of tungstophosphoric acid salt studied by IR spectroscopy},
author = {U B Mioč and V S Kuntić and Z P Nedić and I M Filipović and S B Jelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030521327&partnerID=40&md5=813c78b3aada208869336d936e6f65ef},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {767-771},
abstract = {The influence of the Li and Na salts of 12-tungstophosphoric acid H3P W12O40(WPA) was tested for in vitro effects on blood coagulation. It was found that only Li3WPA shows anticoagulant effects, but compared with WPA activity, the activity of Li salt is diminished. IR spectroscopy was used to define the reaction between these salts, and coagulation proteins. The appearance of bands characteristic of oxonium ion (H3O+) in the IR spectra indicates blocking of the active center of the protein through a very strong hydrogen bond.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the Li and Na salts of 12-tungstophosphoric acid H3P W12O40(WPA) was tested for in vitro effects on blood coagulation. It was found that only Li3WPA shows anticoagulant effects, but compared with WPA activity, the activity of Li salt is diminished. IR spectroscopy was used to define the reaction between these salts, and coagulation proteins. The appearance of bands characteristic of oxonium ion (H3O+) in the IR spectra indicates blocking of the active center of the protein through a very strong hydrogen bond.
Vukojević, V; Sørensen, P G; Hynne, F
Predictive value of a model of the Briggs-Rauscher reaction fitted to quenching experiments Journal Article
In: Journal of Physical Chemistry, vol. 100, no. 43, pp. 17175-17185, 1996.
@article{Vukojević199617175,
title = {Predictive value of a model of the Briggs-Rauscher reaction fitted to quenching experiments},
author = {V Vukojević and P G Sørensen and F Hynne},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001517437&doi=10.1021%2fjp960785o&partnerID=40&md5=636c61ee2c3046e74ee81d82c7af4877},
doi = {10.1021/jp960785o},
year = {1996},
date = {1996-01-01},
journal = {Journal of Physical Chemistry},
volume = {100},
number = {43},
pages = {17175-17185},
abstract = {We describe a model of the Briggs-Rauscher reaction closely related to those due to Furrow and Noyes and to DeKepper and Epstein. The model has been fitted to 16 experimental basic quenching parameters at a Hopf bifurcation point. The fit is quite good. Predictions of the model are compared with experiments close to the Hopf bifurcation as well as at several operating points away from it and with experiments under batch conditions. The angular frequency of the finite limit cycle oscillations near the Hopf bifurcation is half the value observed in the experiments. The relative phases of the concentration oscillations of O2 and I- agree reasonably well with the experiments, but the average values are 1 or 2 orders of magnitude smaller in the simulations. The model demonstrates that it is possible to account for a paradoxical behavior of perturbation by OH- as compared to that of H+ and that quenching from a finite limit cycle may be impossible to realize. It qualitatively explains four distinct quenching experiments by dilution. At three separate operation points away from the Hopf bifurcation the model reproduces two observed patterns, namely, one of bistability between a stationary state and a limit cycle and one of mixed mode oscillations, but it fails to reproduce observed burst oscillations at the appropriate point. The model can reproduce transient batch mode oscillations and other transient behavior. The model of Furrow and Noyes with a more recent set of rate constants and a reduced version of it, derived by sensitivity analysis, are also compared with experiments. © 1996 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We describe a model of the Briggs-Rauscher reaction closely related to those due to Furrow and Noyes and to DeKepper and Epstein. The model has been fitted to 16 experimental basic quenching parameters at a Hopf bifurcation point. The fit is quite good. Predictions of the model are compared with experiments close to the Hopf bifurcation as well as at several operating points away from it and with experiments under batch conditions. The angular frequency of the finite limit cycle oscillations near the Hopf bifurcation is half the value observed in the experiments. The relative phases of the concentration oscillations of O2 and I- agree reasonably well with the experiments, but the average values are 1 or 2 orders of magnitude smaller in the simulations. The model demonstrates that it is possible to account for a paradoxical behavior of perturbation by OH- as compared to that of H+ and that quenching from a finite limit cycle may be impossible to realize. It qualitatively explains four distinct quenching experiments by dilution. At three separate operation points away from the Hopf bifurcation the model reproduces two observed patterns, namely, one of bistability between a stationary state and a limit cycle and one of mixed mode oscillations, but it fails to reproduce observed burst oscillations at the appropriate point. The model can reproduce transient batch mode oscillations and other transient behavior. The model of Furrow and Noyes with a more recent set of rate constants and a reduced version of it, derived by sensitivity analysis, are also compared with experiments. © 1996 American Chemical Society.
Engels, B; Suter, H U; Perić, M
Ab initio investigation of vibrational effects on magnetic hyperfine coupling constants in the X3Σg - state of B2H2 Journal Article
In: Journal of Physical Chemistry, vol. 100, no. 24, pp. 10121-10122, 1996.
@article{Engels199610121,
title = {Ab initio investigation of vibrational effects on magnetic hyperfine coupling constants in the X3Σg - state of B2H2},
author = {B Engels and H U Suter and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0011028105&partnerID=40&md5=cfbfea872c77cf630d3c85e991f0188c},
year = {1996},
date = {1996-01-01},
journal = {Journal of Physical Chemistry},
volume = {100},
number = {24},
pages = {10121-10122},
abstract = {The influence of the vibrational motion on the magnetic hyperfine coupling constants (hfcc's) in the X3Σg - of B2H2 is investigated by means of ab initio methods. The present study clearly shows that for the isotropic hfcc's of the boron centers the incorporation of the vibrational effects is essential already for the vibrational ground state. For the boron center the isotropic hfcc's calculated for the lowest vibrational state (Aiso(11B) = -5.2 MHz) differ considerably from the value obtained at the equilibrium geometry (Aiso(11B) = -14.0 MHz) but agrees excellently with the experimental value (Aiso(11B) = -5.2 MHz) obtained previously. For the hydrogen centers and for all anisotropic hfcc's the effects are found to be much smaller. In the present study the averaged values for various vibrational states and isotopic effects are given. © 1996 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The influence of the vibrational motion on the magnetic hyperfine coupling constants (hfcc's) in the X3Σg - of B2H2 is investigated by means of ab initio methods. The present study clearly shows that for the isotropic hfcc's of the boron centers the incorporation of the vibrational effects is essential already for the vibrational ground state. For the boron center the isotropic hfcc's calculated for the lowest vibrational state (Aiso(11B) = -5.2 MHz) differ considerably from the value obtained at the equilibrium geometry (Aiso(11B) = -14.0 MHz) but agrees excellently with the experimental value (Aiso(11B) = -5.2 MHz) obtained previously. For the hydrogen centers and for all anisotropic hfcc's the effects are found to be much smaller. In the present study the averaged values for various vibrational states and isotopic effects are given. © 1996 American Chemical Society.
Anić, S; Kolar-Anić, L
The Bray-Liebhafsky reaction. VI. Kinetics in iodide oscillations Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 10, pp. 887-891, 1996.
@article{Anić1996887,
title = {The Bray-Liebhafsky reaction. VI. Kinetics in iodide oscillations},
author = {S Anić and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030520321&partnerID=40&md5=66024c873812cc4f79834cb7d5826f5f},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {10},
pages = {887-891},
abstract = {The rate constants and activation energies of the dominant reactions in characteristic kinetic branches of iodide oscilations in the Bray-Liebhafsky system arc determined. In the part of the phase space considered the decisive role of nonradical processes in the appearance of oscillations is suggested.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The rate constants and activation energies of the dominant reactions in characteristic kinetic branches of iodide oscilations in the Bray-Liebhafsky system arc determined. In the part of the phase space considered the decisive role of nonradical processes in the appearance of oscillations is suggested.
Ostojić, B D
Ab initio investigation of the electronic spectrum of the BH radical Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 12, pp. 1165-1177, 1996.
@article{Ostojić19961165,
title = {Ab initio investigation of the electronic spectrum of the BH radical},
author = {B D Ostojić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030376180&partnerID=40&md5=2ba6d279fb94079e30d1cd8c42fb78e9},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {12},
pages = {1165-1177},
abstract = {Potential energy curves for the low-lying singlet and triplet electronic states of the BH radical and the interaction between valence- and Rydberg-type species are studied by means of the ab initio MRD-Cl method. The vertical electronic spectrum of BH is investigated. Vibrational analysis of the most interesting states is undertaken. Comparison is made with available experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Potential energy curves for the low-lying singlet and triplet electronic states of the BH radical and the interaction between valence- and Rydberg-type species are studied by means of the ab initio MRD-Cl method. The vertical electronic spectrum of BH is investigated. Vibrational analysis of the most interesting states is undertaken. Comparison is made with available experimental data.
Petranović, N; Minić, D
Metal phases in zeolite matrix: Electric and electrochemical properties Journal Article
In: Ceramics International, vol. 22, no. 4, pp. 317-320, 1996.
@article{Petranović1996317,
title = {Metal phases in zeolite matrix: Electric and electrochemical properties},
author = {N Petranović and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029719182&doi=10.1016%2f0272-8842%2895%2900110-7&partnerID=40&md5=e106f69baf8e4d03a086feb89ae57524},
doi = {10.1016/0272-8842(95)00110-7},
year = {1996},
date = {1996-01-01},
journal = {Ceramics International},
volume = {22},
number = {4},
pages = {317-320},
abstract = {Thermal vacuum activation of hydrated silver zeolite forms leads to silver clusters formation in zeolite framework. The change in electrical conductivity of the Ag form of zeolites is a direct consequence of the appearance and formation of clusters. The electrochemical behaviour of samples points to the presence of several kinds of silver particles and also to their different location, inside and outside the zeolite. Electric and electrochemical measurements can be of practical importance in the investigation of metal clusters in zeolite structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal vacuum activation of hydrated silver zeolite forms leads to silver clusters formation in zeolite framework. The change in electrical conductivity of the Ag form of zeolites is a direct consequence of the appearance and formation of clusters. The electrochemical behaviour of samples points to the presence of several kinds of silver particles and also to their different location, inside and outside the zeolite. Electric and electrochemical measurements can be of practical importance in the investigation of metal clusters in zeolite structures.
Baranac, J M; Petranović, N A; Dimitrić-Marković, J M
Spectrophotometric study of anthocyan copigmentation reactions Journal Article
In: Journal of Agricultural and Food Chemistry, vol. 44, no. 5, pp. 1333-1336, 1996.
@article{Baranac19961333,
title = {Spectrophotometric study of anthocyan copigmentation reactions},
author = {J M Baranac and N A Petranović and J M Dimitrić-Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0000351643&doi=10.1021%2fjf950420l&partnerID=40&md5=165cfc54a42c781bb622ba9e1f567084},
doi = {10.1021/jf950420l},
year = {1996},
date = {1996-01-01},
journal = {Journal of Agricultural and Food Chemistry},
volume = {44},
number = {5},
pages = {1333-1336},
abstract = {The reaction of malvin. chloride (malvidin 3,5-diglucoside) with a flavonoid compound rutin (quercetin 3-rutinoside) is investigated. Reactions of these molecules are observed through UV-vis absorption spectra, to identify the factors that influence the copigmentation as well as the characteristics of the copigment formed. It is established that the copigmentation process takes place in buffer solutions at a specific pH value and that it is conditioned by the mole ratio and temperature. Copigment formation is defined by kinetic and thermodynamic parameters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The reaction of malvin. chloride (malvidin 3,5-diglucoside) with a flavonoid compound rutin (quercetin 3-rutinoside) is investigated. Reactions of these molecules are observed through UV-vis absorption spectra, to identify the factors that influence the copigmentation as well as the characteristics of the copigment formed. It is established that the copigmentation process takes place in buffer solutions at a specific pH value and that it is conditioned by the mole ratio and temperature. Copigment formation is defined by kinetic and thermodynamic parameters.
Minic, D; Petkovic, J; Koricanac, Z; Jovanovic, T
Spectrophotometric determination of nizatidine in pharmaceutical preparations Journal Article
In: Journal of Pharmaceutical and Biomedical Analysis, vol. 14, no. 8-10, pp. 1355-1358, 1996.
@article{Minic19961355,
title = {Spectrophotometric determination of nizatidine in pharmaceutical preparations},
author = {D Minic and J Petkovic and Z Koricanac and T Jovanovic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030176376&doi=10.1016%2fS0731-7085%2896%2901771-2&partnerID=40&md5=b3df9795f96fefef7065a42ec270b5d3},
doi = {10.1016/S0731-7085(96)01771-2},
year = {1996},
date = {1996-01-01},
journal = {Journal of Pharmaceutical and Biomedical Analysis},
volume = {14},
number = {8-10},
pages = {1355-1358},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bogunović, L J; Mioč, U B; Ribnikar, S V; Stanisavljev, B R
Hydrogen-bonded complexes of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and ketones Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 9, pp. 755-758, 1996.
@article{Bogunović1996755,
title = {Hydrogen-bonded complexes of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and ketones},
author = {L J Bogunović and U B Mioč and S V Ribnikar and B R Stanisavljev},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042357641&partnerID=40&md5=2ac449cc771d1afde636f84c7ac744ef},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {9},
pages = {755-758},
abstract = {The interaction by hydrogen bond formation of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and acetone was investigated in CCl 4 by means of IR spectroscopy. Equilibrium constants and enthalpies of complex formation were determined. The dependence of the spectroscopic parameters, equilibrium constants and enthalpies of complex formation on the proton donating and proton accepting power of the interacting carbinol and ether are discussed. The results are compared with those of earlier sudies on the complexes of trimethylcarbinol with ketones and ethers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The interaction by hydrogen bond formation of 1,1,1-trichloro-2-methyl-2-propanol with some ethers and acetone was investigated in CCl 4 by means of IR spectroscopy. Equilibrium constants and enthalpies of complex formation were determined. The dependence of the spectroscopic parameters, equilibrium constants and enthalpies of complex formation on the proton donating and proton accepting power of the interacting carbinol and ether are discussed. The results are compared with those of earlier sudies on the complexes of trimethylcarbinol with ketones and ethers.
Dondur, V; Petranovic, N; Dimitrijevic, R
High temperature phase transformations of cation exchanged zeolites: A new route for synthesis of aluminosilicate materials Journal Article
In: Materials Science Forum, vol. 214, pp. 91-98, 1996.
@article{Dondur199691,
title = {High temperature phase transformations of cation exchanged zeolites: A new route for synthesis of aluminosilicate materials},
author = {V Dondur and N Petranovic and R Dimitrijevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029725790&partnerID=40&md5=fb73e0f0fb1e6bb19db587fee7718018},
year = {1996},
date = {1996-01-01},
journal = {Materials Science Forum},
volume = {214},
pages = {91-98},
abstract = {Thermal conversion of zeolites (LTA, SOD, TAU, and GIS) exchanged with monovalent counter ions (Li + , Na + , K + , Rb + , Cs + , NH 4 + , Ag + , and Tl + ) is investigated from ambient temperature to 1400°C The new aluminosilicate phases such as α-eucryplite, Ag-carnegieite as well as KAlSiO 4 -ANA and CsAlSiO 4 -ANA are synthesized by this treatment. The mechanisms of phase transformations are elucidated by X-ray, DTA/DSC, and 29 Si and 27 Al MAS NMR methods. The temperature dependent electric conductivity measurements show that synthesized Ag-carnegieite possesses superionic characteristics whereas β-eucryptite can be classified as a good ionic conductor.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal conversion of zeolites (LTA, SOD, TAU, and GIS) exchanged with monovalent counter ions (Li + , Na + , K + , Rb + , Cs + , NH 4 + , Ag + , and Tl + ) is investigated from ambient temperature to 1400°C The new aluminosilicate phases such as α-eucryplite, Ag-carnegieite as well as KAlSiO 4 -ANA and CsAlSiO 4 -ANA are synthesized by this treatment. The mechanisms of phase transformations are elucidated by X-ray, DTA/DSC, and 29 Si and 27 Al MAS NMR methods. The temperature dependent electric conductivity measurements show that synthesized Ag-carnegieite possesses superionic characteristics whereas β-eucryptite can be classified as a good ionic conductor.
Čupić, Z; Anić, S; Mišljenović, D
The Bray-Liebhafsky reaction. VII. Concentrations of the external species H + and IO3 - Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 10, pp. 893-902, 1996.
@article{Čupić1996893,
title = {The Bray-Liebhafsky reaction. VII. Concentrations of the external species H + and IO3 -},
author = {Z Čupić and S Anić and D Mišljenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0030493064&partnerID=40&md5=0a7af9caa4a49fa7d15dd20604a428ae},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {10},
pages = {893-902},
abstract = {A procedure to evaluate pseudo-equilibrium concentrations of hydrogen and iodatc ions, the two ionic species important in the Bray-Liebhafsky oscillatory system, is considered. The values of the concentrations arc found to be predominantly determined by the equilibrium dissociation reactions of sulphuric and iodic acids, and much less by the dimerization of the iodate ion.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A procedure to evaluate pseudo-equilibrium concentrations of hydrogen and iodatc ions, the two ionic species important in the Bray-Liebhafsky oscillatory system, is considered. The values of the concentrations arc found to be predominantly determined by the equilibrium dissociation reactions of sulphuric and iodic acids, and much less by the dimerization of the iodate ion.
Dimitrijević, R; Dondur, V; Kremenović, A
In: Zeolites, vol. 16, no. 4, pp. 294-300, 1996.
@article{Dimitrijević1996294,
title = {Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolite frameworks: Rietveld refinement of the hexagonal CaAl2Si2O8 diphyllosilicate structure},
author = {R Dimitrijević and V Dondur and A Kremenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001032335&doi=10.1016%2f0144-2449%2895%2900154-9&partnerID=40&md5=21c9b4e397d68cbbfb61aa93f0b32219},
doi = {10.1016/0144-2449(95)00154-9},
year = {1996},
date = {1996-01-01},
journal = {Zeolites},
volume = {16},
number = {4},
pages = {294-300},
abstract = {Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolites are followed in the range from room temperature to 1500°C. Both frameworks collapse into amorphous intermediate products after heating between 800 and 900°C. Prolonged heating of the intermediate product obtained from the Ca-LTA zeolite over 900°C induces recrystallization of CaAl2Si2O8 phases (hexagonal CaAl2Si2O8 phase and anorthite) into a mixture. The crystal structure of the hexagonal CaAl2Si2O8 phase [a0 = 5.1154 (Å)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermally induced phase transformations of Ca-exchanged LTA and FAU zeolites are followed in the range from room temperature to 1500°C. Both frameworks collapse into amorphous intermediate products after heating between 800 and 900°C. Prolonged heating of the intermediate product obtained from the Ca-LTA zeolite over 900°C induces recrystallization of CaAl2Si2O8 phases (hexagonal CaAl2Si2O8 phase and anorthite) into a mixture. The crystal structure of the hexagonal CaAl2Si2O8 phase [a0 = 5.1154 (Å)
Gašić, M J; Zlatović, M; Ignjatović, L M; Putniković, B; Sladić, D
Improved electrochemical epoxidation of cholesterol and avarol dimethyl ether Journal Article
In: Journal of the Serbian Chemical Society, vol. 61, no. 11, pp. 1033-1037, 1996.
@article{Gašić19961033,
title = {Improved electrochemical epoxidation of cholesterol and avarol dimethyl ether},
author = {M J Gašić and M Zlatović and L M Ignjatović and B Putniković and D Sladić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-30244489166&partnerID=40&md5=2c2acaf3bec03ba5b6252f0aa0e578bd},
year = {1996},
date = {1996-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {61},
number = {11},
pages = {1033-1037},
abstract = {Electrochemical epoxidation of cholesterol and avarol dimethyl ether with bromide as heteromediator was performed, and its mechanism discussed. The influence of the solvent, the mediator concentration, and different electrolytic techniques on yield of the products was examined. Under optimal conditions, the yield of the cholesterol epoxides (5α,6α and 5β, 6β) was 88%, and of the corresponding epoxides of the avarol dimethyl ether 72%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical epoxidation of cholesterol and avarol dimethyl ether with bromide as heteromediator was performed, and its mechanism discussed. The influence of the solvent, the mediator concentration, and different electrolytic techniques on yield of the products was examined. Under optimal conditions, the yield of the cholesterol epoxides (5α,6α and 5β, 6β) was 88%, and of the corresponding epoxides of the avarol dimethyl ether 72%.
Davidovic, M; Mioc, U B
Heteropolyacids as protonic conductors Journal Article
In: Materials Science Forum, vol. 214, pp. 99-108, 1996.
@article{Davidovic199699,
title = {Heteropolyacids as protonic conductors},
author = {M Davidovic and U B Mioc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029745485&partnerID=40&md5=48e478a94e8146cb9b78af8b3417e44c},
year = {1996},
date = {1996-01-01},
journal = {Materials Science Forum},
volume = {214},
pages = {99-108},
abstract = {Protonic conductors belong to the conductors whose charge carriers are proton and protonic entities: H + , OH, H 2 O, [H(H 2 O)n] + . A small group of these compounds have exceptionally high proton conductivity. Heteropolyacids with respect to their conductivity of (1-100) x10 -3 Scm -1 belong to the superionic conductors at room temperature. They have pronounced catalytic properties. In order to understand the mechanism of conductivity it is necessary to study the structure and dynamic properties of protonic species as charge carriers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Protonic conductors belong to the conductors whose charge carriers are proton and protonic entities: H + , OH, H 2 O, [H(H 2 O)n] + . A small group of these compounds have exceptionally high proton conductivity. Heteropolyacids with respect to their conductivity of (1-100) x10 -3 Scm -1 belong to the superionic conductors at room temperature. They have pronounced catalytic properties. In order to understand the mechanism of conductivity it is necessary to study the structure and dynamic properties of protonic species as charge carriers.
Ignjatović, L M; Barek, J; Zima, J; Marković, D A
Adsorptive Stripping Voltammetric Determination of 1-(4′-Bromophenyl)-3,3-dimethyltriazene Journal Article
In: Mikrochimica Acta, vol. 122, no. 1-2, pp. 101-108, 1996.
@article{Ignjatović1996101,
title = {Adsorptive Stripping Voltammetric Determination of 1-(4′-Bromophenyl)-3,3-dimethyltriazene},
author = {L M Ignjatović and J Barek and J Zima and D A Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-2042489861&partnerID=40&md5=7e93066e2fd2e8d8df11c4def3bbff66},
year = {1996},
date = {1996-01-01},
journal = {Mikrochimica Acta},
volume = {122},
number = {1-2},
pages = {101-108},
abstract = {The optimum conditions were established for the determination of the genotoxic substance 1-(4′-bromophenyl)-3,3-dimethyltriazene by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 × 10-4 to 1 × 10-7 mol dm-3. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substance on the surface of the hanging mercury drop electrode: differential pulse adsorptive stripping voltammetry can be used in the concentration range 1x10-7 to 2 × 10-10 mol dm-3. The relative standard deviation (for ten determinations at 2 × 10-10 mol dm-3) was 7.5%.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The optimum conditions were established for the determination of the genotoxic substance 1-(4′-bromophenyl)-3,3-dimethyltriazene by differential-pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 × 10-4 to 1 × 10-7 mol dm-3. The sensitivity of the determination can be improved through adsorptive accumulation of the investigated substance on the surface of the hanging mercury drop electrode: differential pulse adsorptive stripping voltammetry can be used in the concentration range 1x10-7 to 2 × 10-10 mol dm-3. The relative standard deviation (for ten determinations at 2 × 10-10 mol dm-3) was 7.5%.