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FFH scientific research papers database
FFH database search (1991-2022):
1681.
Šušić, M V; Ribnikar, S V; Maričić, A M
Absorption of hydrogen by palladium-coated tantalum powder Journal Article
In: International Journal of Hydrogen Energy, vol. 19, no. 9, pp. 751-755, 1994.
@article{Šušić1994751,
title = {Absorption of hydrogen by palladium-coated tantalum powder},
author = {M V Šušić and S V Ribnikar and A M Maričić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028499967&doi=10.1016%2f0360-3199%2894%2990239-9&partnerID=40&md5=36bdd109ec1d724b28faa5e95d59eebe},
doi = {10.1016/0360-3199(94)90239-9},
year = {1994},
date = {1994-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {19},
number = {9},
pages = {751-755},
abstract = {By differential scanning calorimetry it is shown that polycrystalline tantalum powder does not absorb hydrogen in the temperature range of 0-350°C. The same powder with surface-deposited palladium (0.033%) shows a considerable absorption capacity. The maximum enthalpy of absorption was -517 J g-1. Kinetic analysis of the absorption process shows different rate constants in the first and subsequent hydridings and that absorption takes place in several distinct stages. The activation energies of absorption are relatively small, below 62 kJ mol-1, except for higher values in narrow temperature intervals at the beginning and end of the process. At hydrogen-saturated samples hydride phases are indicated at temperatures below 80°C. By a method of dehydriding of the hydride by oxygen in air at temperatures of 150-160°C, leading to water formation and heat evolution, the ratios H/Ta and H/Pd were determined in several experiments. Depending on the degree of saturation of the hydrides, H/Ta ratios from 4.7 to 20.0 were found, while the H/Pd ratios varied from 8 × 103 to 4 × 104. X-Ray analysis shows that hydriding changes the structure of the powder. The absorption is to be ascribed to the hydrogen spillover effect through palladium. © 1994.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By differential scanning calorimetry it is shown that polycrystalline tantalum powder does not absorb hydrogen in the temperature range of 0-350°C. The same powder with surface-deposited palladium (0.033%) shows a considerable absorption capacity. The maximum enthalpy of absorption was -517 J g-1. Kinetic analysis of the absorption process shows different rate constants in the first and subsequent hydridings and that absorption takes place in several distinct stages. The activation energies of absorption are relatively small, below 62 kJ mol-1, except for higher values in narrow temperature intervals at the beginning and end of the process. At hydrogen-saturated samples hydride phases are indicated at temperatures below 80°C. By a method of dehydriding of the hydride by oxygen in air at temperatures of 150-160°C, leading to water formation and heat evolution, the ratios H/Ta and H/Pd were determined in several experiments. Depending on the degree of saturation of the hydrides, H/Ta ratios from 4.7 to 20.0 were found, while the H/Pd ratios varied from 8 × 103 to 4 × 104. X-Ray analysis shows that hydriding changes the structure of the powder. The absorption is to be ascribed to the hydrogen spillover effect through palladium. © 1994.
1682.
Mioč, U B; Dimitrijević, R Z; Davidović, M; Nedić, Z P; Mitrović, M M; Colomban, Ph.
Thermally induced phase transformations of 12-tungstophosphoric acid 29-hydrate: synthesis and characterization of PW8O26-type bronzes Journal Article
In: Journal of Materials Science, vol. 29, no. 14, pp. 3705-3718, 1994.
@article{Mioč19943705,
title = {Thermally induced phase transformations of 12-tungstophosphoric acid 29-hydrate: synthesis and characterization of PW8O26-type bronzes},
author = {U B Mioč and R Z Dimitrijević and M Davidović and Z P Nedić and M M Mitrović and Ph. Colomban},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028465293&doi=10.1007%2fBF00357338&partnerID=40&md5=9fd14e24fe3d701cd90f886f1ad7184b},
doi = {10.1007/BF00357338},
year = {1994},
date = {1994-01-01},
journal = {Journal of Materials Science},
volume = {29},
number = {14},
pages = {3705-3718},
abstract = {The phase transformations of 12-tungstophosphoric H3PW12O40-29H2O (29-WPA) acid in the temperature range from ambient temperature to 1150°C were investigated and characterized by differential thermal analysis (DTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), infrared (i.r.) and Raman spectroscopies. From room temperature to 550°C, 29-WPA passes through a dehydration process, which characterizes the formation of different crystallohydrates, in anhydrous form as well as "denuded" Keggin's anions, the D-phase (PW12O38). During these processes, Keggin's anions are not disturbed too much and they are preserved up to about 550°C. The "D" phase is transformed by solid-solid recrystallization at about 600°C in a new monophosphate bronze type compound PW8O26. Unit cell dimensions were calculated from XRPD data (ao=0.7515 nm). With the temperature increasing up to 1150°C, novel synthesized cubic bronze passed through three polymorphous phase transitions. According to a general formula for monophosphate tungsten bronzes (WO3)2m (PO4)4 all four polymorphs have m=16. © 1994 Chapman & Hall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The phase transformations of 12-tungstophosphoric H3PW12O40-29H2O (29-WPA) acid in the temperature range from ambient temperature to 1150°C were investigated and characterized by differential thermal analysis (DTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), infrared (i.r.) and Raman spectroscopies. From room temperature to 550°C, 29-WPA passes through a dehydration process, which characterizes the formation of different crystallohydrates, in anhydrous form as well as "denuded" Keggin's anions, the D-phase (PW12O38). During these processes, Keggin's anions are not disturbed too much and they are preserved up to about 550°C. The "D" phase is transformed by solid-solid recrystallization at about 600°C in a new monophosphate bronze type compound PW8O26. Unit cell dimensions were calculated from XRPD data (ao=0.7515 nm). With the temperature increasing up to 1150°C, novel synthesized cubic bronze passed through three polymorphous phase transitions. According to a general formula for monophosphate tungsten bronzes (WO3)2m (PO4)4 all four polymorphs have m=16. © 1994 Chapman & Hall.
1683.
Sužnjević, D; Grigorijev, P A; Vučelić, D
Study of LBM interactions with some surface-active substances by the method of capacity minimization Journal Article
In: Bioelectrochemistry and Bioenergetics, vol. 34, no. 1, pp. 19-24, 1994.
@article{Sužnjević199419,
title = {Study of LBM interactions with some surface-active substances by the method of capacity minimization},
author = {D Sužnjević and P A Grigorijev and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028356355&doi=10.1016%2f0302-4598%2894%2980004-9&partnerID=40&md5=32149b841e15638c410e6999e310f03c},
doi = {10.1016/0302-4598(94)80004-9},
year = {1994},
date = {1994-01-01},
journal = {Bioelectrochemistry and Bioenergetics},
volume = {34},
number = {1},
pages = {19-24},
abstract = {The variation in intramembrane potential resulting from the asymmetry of the surface potentials of artificial lipid bilayer membranes (LBMs), formed by phospholipids (phosphatidylcholin and phosphatidylethanolamine) in contact with non-ionic, cationic, anionic and zwitterionic surfactants was followed by the method of capacity minimization. The interaction of different types of surfactants with LBM is specific in nature. The dependence of the shapes of adsorption isotherms constructed from the capacity minimum potentials on surfactant concentration is found to be strongly influenced by the ionic form of the surface-active substances used. © 1994.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The variation in intramembrane potential resulting from the asymmetry of the surface potentials of artificial lipid bilayer membranes (LBMs), formed by phospholipids (phosphatidylcholin and phosphatidylethanolamine) in contact with non-ionic, cationic, anionic and zwitterionic surfactants was followed by the method of capacity minimization. The interaction of different types of surfactants with LBM is specific in nature. The dependence of the shapes of adsorption isotherms constructed from the capacity minimum potentials on surfactant concentration is found to be strongly influenced by the ionic form of the surface-active substances used. © 1994.
1684.
Zakrzewska, J; Okon, M; Vučelić, D
1H and 13C NMR assignment of sodium chenodeoxycholate in aqueous solution. Polarization of bile salts steroid nucleus Journal Article
In: Magnetic Resonance in Chemistry, vol. 32, no. 2, pp. 93-96, 1994.
@article{Zakrzewska199493,
title = {1H and 13C NMR assignment of sodium chenodeoxycholate in aqueous solution. Polarization of bile salts steroid nucleus},
author = {J Zakrzewska and M Okon and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989036080&doi=10.1002%2fmrc.1260320206&partnerID=40&md5=c685fa60e8943267dc3bea3e2f050601},
doi = {10.1002/mrc.1260320206},
year = {1994},
date = {1994-01-01},
journal = {Magnetic Resonance in Chemistry},
volume = {32},
number = {2},
pages = {93-96},
abstract = {1H and 13C NMR assignments of sodium chenodeoxycholate in aqueous solution were obtained for three different bile salt concentrations. 1H and 13C NMR chemical shifts of sodium chenodeoxycholate and deoxycholate show slight concentration dependence due to micelle formation. Opposite trends in chemical shifts changes for α‐ and β‐protons cause polarization of the steroid nucleus. Copyright © 1994 John Wiley & Sons Limited},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1H and 13C NMR assignments of sodium chenodeoxycholate in aqueous solution were obtained for three different bile salt concentrations. 1H and 13C NMR chemical shifts of sodium chenodeoxycholate and deoxycholate show slight concentration dependence due to micelle formation. Opposite trends in chemical shifts changes for α‐ and β‐protons cause polarization of the steroid nucleus. Copyright © 1994 John Wiley & Sons Limited
1685.
Ignjatović, L M; Barek, J; Zima, J; Marković, D A
Polarographic behaviour and determination of 1-(4′-bromophenyl)-3,3-dimethyltriazene Journal Article
In: Analytica Chimica Acta, vol. 284, no. 2, pp. 413-418, 1993.
@article{Ignjatović1993413,
title = {Polarographic behaviour and 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-s2.0-0027815256&doi=10.1016%2f0003-2670%2893%2985327-G&partnerID=40&md5=77f061f90cbc7de600610fba4fbb75a0},
doi = {10.1016/0003-2670(93)85327-G},
year = {1993},
date = {1993-01-01},
journal = {Analytica Chimica Acta},
volume = {284},
number = {2},
pages = {413-418},
abstract = {A study was made of the polarographic behaviour of the genotoxic substance 1-(4′-bromopheyl)-3,3-dimethlytriazene and optimum conditions were found for its determination by tast polarography and differential-pulse polarography at a static mercury drop electrode in the concentration range 1 × 10-4-1 × 10-7 mol dm-3. The results indicate that the method can be used at pH between 4.5 and6.0 for the identification and determination of the investigated substance, which is protonated without decomposition in this pH range. It was established that for the reduction of the NN group four electrons are required and the resulting products are 4-bromoaniline and dimethylhydrazine. © 1993.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A study was made of the polarographic behaviour of the genotoxic substance 1-(4′-bromopheyl)-3,3-dimethlytriazene and optimum conditions were found for its determination by tast polarography and differential-pulse polarography at a static mercury drop electrode in the concentration range 1 × 10-4-1 × 10-7 mol dm-3. The results indicate that the method can be used at pH between 4.5 and6.0 for the identification and determination of the investigated substance, which is protonated without decomposition in this pH range. It was established that for the reduction of the NN group four electrons are required and the resulting products are 4-bromoaniline and dimethylhydrazine. © 1993.
1686.
Poleksic, L; Zdravkovic, D; Jablanovic, D; Watt, I; Bacic, G
Magnetic resonance imaging of bone destruction in rheumatoid arthritis: comparison with radiography Journal Article
In: Skeletal Radiology, vol. 22, no. 8, pp. 577-580, 1993.
@article{Poleksic1993577,
title = {Magnetic resonance imaging of bone destruction in rheumatoid arthritis: comparison with radiography},
author = {L Poleksic and D Zdravkovic and D Jablanovic and I Watt and G Bacic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027439943&doi=10.1007%2fBF00197138&partnerID=40&md5=9b795a57fcbaef8a6238552be82e81cb},
doi = {10.1007/BF00197138},
year = {1993},
date = {1993-01-01},
journal = {Skeletal Radiology},
volume = {22},
number = {8},
pages = {577-580},
abstract = {Bony changes in forty-four knees of patients with clinically established rheumatoid arthritis (RA) were examined using magnetic resonance imaging (MRI) and plain film radiography. In all cases MRI was clearly superior to radiographs, demonstrating 25 marginal erosions and 42 subchondral cysts, while the number seen on radiographs was 3 and 8, respectively. These results emphasize the problems in visualizing bone erosions in large joints using plain films. MRI is the method of choice for detecting early changes in RA, not only because of its high sensitivity, but also because of the ability of contrast-enhanced MRI to provide physiological characterization of these lesions. © 1993 International Skeletal Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bony changes in forty-four knees of patients with clinically established rheumatoid arthritis (RA) were examined using magnetic resonance imaging (MRI) and plain film radiography. In all cases MRI was clearly superior to radiographs, demonstrating 25 marginal erosions and 42 subchondral cysts, while the number seen on radiographs was 3 and 8, respectively. These results emphasize the problems in visualizing bone erosions in large joints using plain films. MRI is the method of choice for detecting early changes in RA, not only because of its high sensitivity, but also because of the ability of contrast-enhanced MRI to provide physiological characterization of these lesions. © 1993 International Skeletal Society.
1687.
Vujisic, B R; Savovic, J J; Pesic, D S; BojoviC, V
Blue (A-X) System of ^ag^&0 moleculel Journal Article
In: Spectroscopy Letters, vol. 26, no. 8, pp. 1529-1535, 1993.
@article{Vujisic19931529,
title = {Blue (A-X) System of ^ag^&0 moleculel},
author = {B R Vujisic and J J Savovic and D S Pesic and V BojoviC},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0005365431&doi=10.1080%2f00387019308011631&partnerID=40&md5=cbd8b5dfd4266660c404805e81159a29},
doi = {10.1080/00387019308011631},
year = {1993},
date = {1993-01-01},
journal = {Spectroscopy Letters},
volume = {26},
number = {8},
pages = {1529-1535},
abstract = {The blue A2II-X2n emission system of the 107Ag18O molecule excited in a low-pressure arc, was recorded in the region 400–475 nm with medium dispersion. The vibrational analysis, supported by isotope shifts study, of the red-degraded bands has been made. The final set of the improved 107Ag16O and the new 107Ag18O vibrational constants of the two sub-systems involved in transition are determined. © 1993, Taylor & Francis Group, LLC. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The blue A2II-X2n emission system of the 107Ag18O molecule excited in a low-pressure arc, was recorded in the region 400–475 nm with medium dispersion. The vibrational analysis, supported by isotope shifts study, of the red-degraded bands has been made. The final set of the improved 107Ag16O and the new 107Ag18O vibrational constants of the two sub-systems involved in transition are determined. © 1993, Taylor & Francis Group, LLC. All rights reserved.
1688.
Šušić, M V; Maričić, A M
In: Journal of Materials Science, vol. 28, no. 12, pp. 3161-3167, 1993.
@article{Šušić19933161,
title = {Spillover effect in the hydrogen absorption by the polycrystalline powder alloy FeNi1.75Cu1.5Mo0.5 and electric conductivity of the pressed powder},
author = {M V Šušić and A M Maričić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027610393&doi=10.1007%2fBF00354231&partnerID=40&md5=bc0329d4877c805bf478d215648f7542},
doi = {10.1007/BF00354231},
year = {1993},
date = {1993-01-01},
journal = {Journal of Materials Science},
volume = {28},
number = {12},
pages = {3161-3167},
abstract = {The process of hydrogen absorption by the FeNi1.75Cu1.5Mo0.5 alloy in the polycrystalline form was investigated for both the pure and palladized forms (0.008 76% Pd) at temperatures from ambient to 600 °C in a hydrogen flow. Using differential scanning calorimetry, (DSC) thermogravimetry (TG) and X-ray diffraction, the influence of palladization on the hydrogen absorption was demonstrated. Kinetic analysis of the DSC thermograms, the kinetic and thermic parameters of hydrogen absorption were determined. The TG thermograms showed that on hydrogen absorption a weight change took place due to water formation and reduction of the oxide film at the surface of the powder particles. The activation energies of hydrogen absorption were 170 kJ mol-1 for the original powder and 32 kJ mol-1 for the palladized one. The enthalpies of the absorption ranged from ΔH = -5 to ΔH = -380 J g-1 for the original and palladized powder, respectively. The rate constants of the absorption depended on the palladization and were found to be 0.03 and 1.20 s-1, respectively, at 162 °C. The electric conductivity of the pressed powder (9 kbar) increases on heating in both air and a hydrogen atmosphere up to 600 °C, tending to a constant value. The changes of the parameters characteristic of the palladized form are ascribed to the mechanism of a hydrogen spillover effect due to the presence of palladium. © 1993 Kluwer Academic Publishers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of hydrogen absorption by the FeNi1.75Cu1.5Mo0.5 alloy in the polycrystalline form was investigated for both the pure and palladized forms (0.008 76% Pd) at temperatures from ambient to 600 °C in a hydrogen flow. Using differential scanning calorimetry, (DSC) thermogravimetry (TG) and X-ray diffraction, the influence of palladization on the hydrogen absorption was demonstrated. Kinetic analysis of the DSC thermograms, the kinetic and thermic parameters of hydrogen absorption were determined. The TG thermograms showed that on hydrogen absorption a weight change took place due to water formation and reduction of the oxide film at the surface of the powder particles. The activation energies of hydrogen absorption were 170 kJ mol-1 for the original powder and 32 kJ mol-1 for the palladized one. The enthalpies of the absorption ranged from ΔH = -5 to ΔH = -380 J g-1 for the original and palladized powder, respectively. The rate constants of the absorption depended on the palladization and were found to be 0.03 and 1.20 s-1, respectively, at 162 °C. The electric conductivity of the pressed powder (9 kbar) increases on heating in both air and a hydrogen atmosphere up to 600 °C, tending to a constant value. The changes of the parameters characteristic of the palladized form are ascribed to the mechanism of a hydrogen spillover effect due to the presence of palladium. © 1993 Kluwer Academic Publishers.
1689.
Sabo, T; Juranić, N; Dondur, V; Ćelap, M B
In: Thermochimica Acta, vol. 213, no. C, pp. 293-304, 1993.
@article{Sabo1993293,
title = {A kinetic investigation of the tris(4-morpholinecarbodithionato-S,S') cobalt(III) complex formation by the intralattice and interlattice reactions},
author = {T Sabo and N Juranić and V Dondur and M B Ćelap},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4243322238&doi=10.1016%2f0040-6031%2893%2980023-4&partnerID=40&md5=03005f3c73148e0da451895265ea06b6},
doi = {10.1016/0040-6031(93)80023-4},
year = {1993},
date = {1993-01-01},
journal = {Thermochimica Acta},
volume = {213},
number = {C},
pages = {293-304},
abstract = {The kinetics of tris-(4-morpholinecarbodithionato-S,S) cobalt(III) formation by the intralattice and interlattice reactions of hexaaminecobalt(III) cation with dithiocarbamato anion was investigated under isothermal conditions. The intralattice reaction, conducted in the solid hexaaminecobalt(III) 4-morpholinecarbodithionate salt, proceeded well at temperatures of 50-80°C, conforming to the phase boundary Rn reaction mechanism (Ea = 92.6 kJ mol-1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The kinetics of tris-(4-morpholinecarbodithionato-S,S) cobalt(III) formation by the intralattice and interlattice reactions of hexaaminecobalt(III) cation with dithiocarbamato anion was investigated under isothermal conditions. The intralattice reaction, conducted in the solid hexaaminecobalt(III) 4-morpholinecarbodithionate salt, proceeded well at temperatures of 50-80°C, conforming to the phase boundary Rn reaction mechanism (Ea = 92.6 kJ mol-1
1690.
Ignjatović, L M; Marković, D A; Veselinović, D S; Bešić, B R
Polarographic behavior and determination of some S‐triazine herbicides Journal Article
In: Electroanalysis, vol. 5, no. 5-6, pp. 529-533, 1993.
@article{Ignjatović1993529,
title = {Polarographic behavior and determination of some S‐triazine herbicides},
author = {L M Ignjatović and D A Marković and D S Veselinović and B R Bešić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987467022&doi=10.1002%2felan.1140050525&partnerID=40&md5=c6b897ac1279838f355b336c0b03907f},
doi = {10.1002/elan.1140050525},
year = {1993},
date = {1993-01-01},
journal = {Electroanalysis},
volume = {5},
number = {5-6},
pages = {529-533},
abstract = {The possibility for differential pulse polarography (DPP) determination of S‐triazine has been shown and compared with gas‐chromatographic (GC) measurements. Good agreement was found between GC and DPP measurements in analyzing 20 samples of industrial wastewater. It was found, using controlled potential coulometry (CPC), that four electrons take part in electrochemical reduction steps. On the basis of this and polarographic measurements, the mechanism of electrochemical reduction of S‐triazine was postulated. Copyright © 1993 VCH Publishers, Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The possibility for differential pulse polarography (DPP) determination of S‐triazine has been shown and compared with gas‐chromatographic (GC) measurements. Good agreement was found between GC and DPP measurements in analyzing 20 samples of industrial wastewater. It was found, using controlled potential coulometry (CPC), that four electrons take part in electrochemical reduction steps. On the basis of this and polarographic measurements, the mechanism of electrochemical reduction of S‐triazine was postulated. Copyright © 1993 VCH Publishers, Inc.
1691.
Tjapkin, N; Davidović, M; Colomban, Ph.; Mioč, U
Complex dielectric permittivity, bulk and surface conductivity of 12-tungstophosphoric acid hexahydrate and its dehydrated forms Journal Article
In: Solid State Ionics, vol. 61, no. 1-3, pp. 179-185, 1993.
@article{Tjapkin1993179,
title = {Complex dielectric permittivity, bulk and surface conductivity of 12-tungstophosphoric acid hexahydrate and its dehydrated forms},
author = {N Tjapkin and M Davidović and Ph. Colomban and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027597124&doi=10.1016%2f0167-2738%2893%2990352-4&partnerID=40&md5=be5dc83983d014a4add5c7c785d19da4},
doi = {10.1016/0167-2738(93)90352-4},
year = {1993},
date = {1993-01-01},
journal = {Solid State Ionics},
volume = {61},
number = {1-3},
pages = {179-185},
abstract = {Impedance measurements on pelletised 12-tungstophosphoric acid hydrates were performed in the frequency range 20 Hz-1 GHz, at temperatures from 20°C to 400°C, in the air of different humidities. Both the dielectric relaxations and conductivity of hexahydrate vary with the amount of water in surface layer. Bulk protonic conductivity of hexahydrate at room temperature was found to be about 3 × 10-11 S cm-1. Interesting behaviour of conductivity of anhydrous samples was observed. © 1993.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Impedance measurements on pelletised 12-tungstophosphoric acid hydrates were performed in the frequency range 20 Hz-1 GHz, at temperatures from 20°C to 400°C, in the air of different humidities. Both the dielectric relaxations and conductivity of hexahydrate vary with the amount of water in surface layer. Bulk protonic conductivity of hexahydrate at room temperature was found to be about 3 × 10-11 S cm-1. Interesting behaviour of conductivity of anhydrous samples was observed. © 1993.
1692.
Fejzo, J; Westler, W M; Markley, J L; Macura, S
In: Journal of the American Chemical Society, vol. 114, no. 4, pp. 1523-1524, 1992.
@article{Fejzo19921523,
title = {Complete Elimination of Spin Diffusion from Selected Resonances in Two-Dimensional Cross-Relaxation Spectra of Macromolecules by a Novel Pulse Sequence (SNOESY)},
author = {J Fejzo and W M Westler and J L Markley and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001308804&doi=10.1021%2fja00030a082&partnerID=40&md5=e6ceb6f6d053790ac903cf424eef23c7},
doi = {10.1021/ja00030a082},
year = {1992},
date = {1992-01-01},
journal = {Journal of the American Chemical Society},
volume = {114},
number = {4},
pages = {1523-1524},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1693.
Šušić, M V
Spill-over process of hydrogen sorption on palladized alumina, yttria and zeolite 4A Journal Article
In: Journal of Materials Science, vol. 27, no. 14, pp. 3733-3742, 1992.
@article{Šušić19923733,
title = {Spill-over process of hydrogen sorption on palladized alumina, yttria and zeolite 4A},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-3743115267&doi=10.1007%2fBF00545449&partnerID=40&md5=f91855df1d680d3e024730781cfd7ed7},
doi = {10.1007/BF00545449},
year = {1992},
date = {1992-01-01},
journal = {Journal of Materials Science},
volume = {27},
number = {14},
pages = {3733-3742},
abstract = {Doping of alumina, yttria and zeolite 4A with small quantities of palladium (down to 0.025%) was done. It was shown that these oxides, which do not normally absorb hydrogen, after the doping acquire a considerable capacity for hydrogen absorption. The sorption of hydrogen is occurring by the spill-over effect from metallic palladium to the oxide. The process is exothermal, taking place in two stages between 60 and 350 °C. Activation energies of the first stage range from 120 to 167 kJ mol-1 and for the second one from 20 to 30 kJ mol-1. After cooling to room temperature in hydrogen flow, the samples are able to absorb considerable quantities of oxygen which reacts exothermally with the previously formed hydride. On next exposition to hydrogen, a vigorous reaction of it with the adsorbed oxygen is taking place already at room temperature. Enthalpies of hydrogen absorption, - ΔH, are of the order of 10 kJ g-1, showing a tendency of increase after repeated exposures to hydrogen. © 1992 Chapman & Hall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Doping of alumina, yttria and zeolite 4A with small quantities of palladium (down to 0.025%) was done. It was shown that these oxides, which do not normally absorb hydrogen, after the doping acquire a considerable capacity for hydrogen absorption. The sorption of hydrogen is occurring by the spill-over effect from metallic palladium to the oxide. The process is exothermal, taking place in two stages between 60 and 350 °C. Activation energies of the first stage range from 120 to 167 kJ mol-1 and for the second one from 20 to 30 kJ mol-1. After cooling to room temperature in hydrogen flow, the samples are able to absorb considerable quantities of oxygen which reacts exothermally with the previously formed hydride. On next exposition to hydrogen, a vigorous reaction of it with the adsorbed oxygen is taking place already at room temperature. Enthalpies of hydrogen absorption, - ΔH, are of the order of 10 kJ g-1, showing a tendency of increase after repeated exposures to hydrogen. © 1992 Chapman & Hall.
1694.
Tkalčce, E; Šenija, D; Dondur, V; Petranović, N
Influence of Dopants on Nucleation and Growth of High‐Quartz Solid Solution in Lithium Aluminosilicate Glass Journal Article
In: Journal of the American Ceramic Society, vol. 75, no. 7, pp. 1958-1963, 1992.
@article{Tkalčce19921958,
title = {Influence of Dopants on Nucleation and Growth of High‐Quartz Solid Solution in Lithium Aluminosilicate Glass},
author = {E Tkalčce and D Šenija and V Dondur and N Petranović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0344407927&doi=10.1111%2fj.1151-2916.1992.tb07223.x&partnerID=40&md5=293c3bd7a093760879483bd7f9f81d53},
doi = {10.1111/j.1151-2916.1992.tb07223.x},
year = {1992},
date = {1992-01-01},
journal = {Journal of the American Ceramic Society},
volume = {75},
number = {7},
pages = {1958-1963},
abstract = {The kinetic parameters of nucleation and crystal growth of high‐quartz solid solution in multicomponent lithium aluminosilicate glasses doped with various transition‐metalions were studied by nonisothermal DTA. The crystallization of glasses nucleated at different temperatures was carried out, and plots of the DTA peak versus the nucleation temperatures were used to determine the maximum nucleation rate temperature. Peak temperature data of nucleated samples at varying heating rates (5–20 K/min) were used to determine the activation energy for crystallization via the JMA equation. The temperature of maximum nucleation rate depends greatly on the doped transition‐ metal ions present. The activation energy for crystallization obtained for undoped glass or glasses doped with Fe2O3 is of the same order as that already published, and the Avrami exponent is consistent with predominantly three‐dimensional crystal growth. The much higher activation energy values for glasses doped with CoO could be a consequence of two crystallization processes proceeding simultaneously. Copyright © 1992, Wiley Blackwell. All rights reserved},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The kinetic parameters of nucleation and crystal growth of high‐quartz solid solution in multicomponent lithium aluminosilicate glasses doped with various transition‐metalions were studied by nonisothermal DTA. The crystallization of glasses nucleated at different temperatures was carried out, and plots of the DTA peak versus the nucleation temperatures were used to determine the maximum nucleation rate temperature. Peak temperature data of nucleated samples at varying heating rates (5–20 K/min) were used to determine the activation energy for crystallization via the JMA equation. The temperature of maximum nucleation rate depends greatly on the doped transition‐ metal ions present. The activation energy for crystallization obtained for undoped glass or glasses doped with Fe2O3 is of the same order as that already published, and the Avrami exponent is consistent with predominantly three‐dimensional crystal growth. The much higher activation energy values for glasses doped with CoO could be a consequence of two crystallization processes proceeding simultaneously. Copyright © 1992, Wiley Blackwell. All rights reserved
1695.
Macura, S; Fejzo, J; Hoogstraten, C G; Westler, W M; Markley, J L
Topological Editing of Cross‐Relaxation Networks Journal Article
In: Israel Journal of Chemistry, vol. 32, no. 2-3, pp. 245-256, 1992.
@article{Macura1992245,
title = {Topological Editing of Cross‐Relaxation Networks},
author = {S Macura and J Fejzo and C G Hoogstraten and W M Westler and J L Markley},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85005665533&doi=10.1002%2fijch.199200031&partnerID=40&md5=70e4fece27d4f026e07a97eea9a1758b},
doi = {10.1002/ijch.199200031},
year = {1992},
date = {1992-01-01},
journal = {Israel Journal of Chemistry},
volume = {32},
number = {2-3},
pages = {245-256},
abstract = {We have used the elements of graph theory to describe NMR cross‐relaxation networks in macromolecules and to analyze different experiments used for topological editing. We propose a new experiment, block decoupled NOESY (B.D. NOESY), that splits the cross‐relaxation network of a macromolecular system into two noninteracting subdomains. Splitting is achieved by arranging for the effective z‐components of the magnetization in one subdomain, as viewed from the other subdomain, to be zero. The B.D. NOESY experiment, in favorable cases, can usefully simplify the analysis of cross‐relaxation spectra by removing certain ambiguities. We demonstrate the method by separating the aromatic resonances from the rest of the cross‐relaxation network of a small globular protein: turkey ovomucoid third domain, Mr 6000. The resulting spectrum provides a clearer picture of cross‐relaxation pathways that involve only aromatic or only aliphatic spins. By comparing the B.D. NOESY spectrum with the normal NOESY spectrum, we were able to identify cross peaks that contain contributions from indirect magnetization transfer (spin diffusion) mediated by the aromatic side chains. In the terminology of graph theory, these experiments decompose topological networks of cross‐relaxation into two subgraphs, the join of which generates the original graph. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have used the elements of graph theory to describe NMR cross‐relaxation networks in macromolecules and to analyze different experiments used for topological editing. We propose a new experiment, block decoupled NOESY (B.D. NOESY), that splits the cross‐relaxation network of a macromolecular system into two noninteracting subdomains. Splitting is achieved by arranging for the effective z‐components of the magnetization in one subdomain, as viewed from the other subdomain, to be zero. The B.D. NOESY experiment, in favorable cases, can usefully simplify the analysis of cross‐relaxation spectra by removing certain ambiguities. We demonstrate the method by separating the aromatic resonances from the rest of the cross‐relaxation network of a small globular protein: turkey ovomucoid third domain, Mr 6000. The resulting spectrum provides a clearer picture of cross‐relaxation pathways that involve only aromatic or only aliphatic spins. By comparing the B.D. NOESY spectrum with the normal NOESY spectrum, we were able to identify cross peaks that contain contributions from indirect magnetization transfer (spin diffusion) mediated by the aromatic side chains. In the terminology of graph theory, these experiments decompose topological networks of cross‐relaxation into two subgraphs, the join of which generates the original graph. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
1696.
Šušić, M V; Maričić, A M; Dimitrijević, R Ž
Correlation between thermal, kinetic, magnetic and electric effects in the crystallization process of amorphous magnetic alloys Journal Article
In: Materials Chemistry and Physics, vol. 30, no. 4, pp. 221-227, 1992.
@article{Šušić1992221,
title = {Correlation between thermal, kinetic, magnetic and electric effects in the crystallization process of amorphous magnetic alloys},
author = {M V Šušić and A M Maričić and R Ž Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026819284&doi=10.1016%2f0254-0584%2892%2990228-Z&partnerID=40&md5=41b3c88b5f6157160123b961b06eb65a},
doi = {10.1016/0254-0584(92)90228-Z},
year = {1992},
date = {1992-01-01},
journal = {Materials Chemistry and Physics},
volume = {30},
number = {4},
pages = {221-227},
abstract = {By use of differential scanning calorimetry the mechanism of crystallization (devitrification) was investigated for magnetic amorphous alloys of compositions Fe82B13Si5 (A) and Fe75B10Si15 (B) in the temperature range between ambient and 600 °C. It was shown that both alloys crystallize in two stages between 480° and 520 °C. The energies of activation of the process},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By use of differential scanning calorimetry the mechanism of crystallization (devitrification) was investigated for magnetic amorphous alloys of compositions Fe82B13Si5 (A) and Fe75B10Si15 (B) in the temperature range between ambient and 600 °C. It was shown that both alloys crystallize in two stages between 480° and 520 °C. The energies of activation of the process
1697.
Isernia, C; Paolillo, L; Russo, E; Pastore, A; Zanotti, G; Macura, S
Evaluation of errors of interproton distances and correlation time determined from NMR cross-relaxation rates Journal Article
In: Journal of Biomolecular NMR, vol. 2, no. 6, pp. 573-582, 1992.
@article{Isernia1992573,
title = {Evaluation of errors of interproton distances and correlation time determined from NMR cross-relaxation rates},
author = {C Isernia and L Paolillo and E Russo and A Pastore and G Zanotti and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0002121073&doi=10.1007%2fBF02192846&partnerID=40&md5=94c6886b07eb8d25c548564021621c34},
doi = {10.1007/BF02192846},
year = {1992},
date = {1992-01-01},
journal = {Journal of Biomolecular NMR},
volume = {2},
number = {6},
pages = {573-582},
abstract = {We have analyzed a combined use of the two-dimensional nuclear Overhauser effect in the laboratory frame (NOESY) and in the rotating frame (ROESY) to determine interproton distances and correlation time in medium-sized rigid molecules (Davis, 1987). This method can be applied in the intermediate motional regime, 0.2 < ωoτc, < 5, (τc, correlation time, (ωo resonance frequency). Error limits depend on the motional regime and are smallest near ωoτc=1.14. The method was tested on six geminal proton pairs in the bicyclic octapeptide (S-deoxo-γ-[R]-OH-Ile3 amaninamide},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have analyzed a combined use of the two-dimensional nuclear Overhauser effect in the laboratory frame (NOESY) and in the rotating frame (ROESY) to determine interproton distances and correlation time in medium-sized rigid molecules (Davis, 1987). This method can be applied in the intermediate motional regime, 0.2 < ωoτc, < 5, (τc, correlation time, (ωo resonance frequency). Error limits depend on the motional regime and are smallest near ωoτc=1.14. The method was tested on six geminal proton pairs in the bicyclic octapeptide (S-deoxo-γ-[R]-OH-Ile3 amaninamide
1698.
Fejzo, J; Westler, W M; Macura, S; Markley, J L
Elimination of chemical-exchange-mediated spin diffusion from exchange spectra of macromolecules. Exchange-decoupled NOESY (XD-NOESY) Journal Article
In: Journal of Magnetic Resonance (1969), vol. 92, no. 1, pp. 195-202, 1991.
@article{Fejzo1991195,
title = {Elimination of chemical-exchange-mediated spin diffusion from exchange spectra of macromolecules. Exchange-decoupled NOESY (XD-NOESY)},
author = {J Fejzo and W M Westler and S Macura and J L Markley},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001645579&doi=10.1016%2f0022-2364%2891%2990262-R&partnerID=40&md5=3d953235ca69e0f970a300671527caf1},
doi = {10.1016/0022-2364(91)90262-R},
year = {1991},
date = {1991-01-01},
journal = {Journal of Magnetic Resonance (1969)},
volume = {92},
number = {1},
pages = {195-202},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1699.
Vukelić, N; Antić-Jovanović, A; Pešić, D S
Franck-Condon Factors and r-Centroids of the B-X Bands of BeI8O Molecule Journal Article
In: Spectroscopy Letters, vol. 24, no. 4, pp. 519-524, 1991.
@article{Vukelić1991519,
title = {Franck-Condon Factors and r-Centroids of the B-X Bands of BeI8O Molecule},
author = {N Vukelić and A Antić-Jovanović and D S Pešić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79953238512&doi=10.1080%2f00387019108018135&partnerID=40&md5=2d72ad6ca173e12c988c7058d85f94a6},
doi = {10.1080/00387019108018135},
year = {1991},
date = {1991-01-01},
journal = {Spectroscopy Letters},
volume = {24},
number = {4},
pages = {519-524},
abstract = {The Franck-Condon factors, qv’,v., and r-centroids, rv’., for the bands of the B1Σ+-X1Σ+transition of Bel8O molecule (420–520 nm) are determined. A comparison of calculated qv’. values with the experimental estimated intensities of the bands shows reasonable agreement. © 1991, Taylor & Francis Group, LLC. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Franck-Condon factors, qv’,v., and r-centroids, rv’., for the bands of the B1Σ+-X1Σ+transition of Bel8O molecule (420–520 nm) are determined. A comparison of calculated qv’. values with the experimental estimated intensities of the bands shows reasonable agreement. © 1991, Taylor & Francis Group, LLC. All rights reserved.
1994
Šušić, M V; Ribnikar, S V; Maričić, A M
Absorption of hydrogen by palladium-coated tantalum powder Journal Article
In: International Journal of Hydrogen Energy, vol. 19, no. 9, pp. 751-755, 1994.
@article{Šušić1994751,
title = {Absorption of hydrogen by palladium-coated tantalum powder},
author = {M V Šušić and S V Ribnikar and A M Maričić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028499967&doi=10.1016%2f0360-3199%2894%2990239-9&partnerID=40&md5=36bdd109ec1d724b28faa5e95d59eebe},
doi = {10.1016/0360-3199(94)90239-9},
year = {1994},
date = {1994-01-01},
journal = {International Journal of Hydrogen Energy},
volume = {19},
number = {9},
pages = {751-755},
abstract = {By differential scanning calorimetry it is shown that polycrystalline tantalum powder does not absorb hydrogen in the temperature range of 0-350°C. The same powder with surface-deposited palladium (0.033%) shows a considerable absorption capacity. The maximum enthalpy of absorption was -517 J g-1. Kinetic analysis of the absorption process shows different rate constants in the first and subsequent hydridings and that absorption takes place in several distinct stages. The activation energies of absorption are relatively small, below 62 kJ mol-1, except for higher values in narrow temperature intervals at the beginning and end of the process. At hydrogen-saturated samples hydride phases are indicated at temperatures below 80°C. By a method of dehydriding of the hydride by oxygen in air at temperatures of 150-160°C, leading to water formation and heat evolution, the ratios H/Ta and H/Pd were determined in several experiments. Depending on the degree of saturation of the hydrides, H/Ta ratios from 4.7 to 20.0 were found, while the H/Pd ratios varied from 8 × 103 to 4 × 104. X-Ray analysis shows that hydriding changes the structure of the powder. The absorption is to be ascribed to the hydrogen spillover effect through palladium. © 1994.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By differential scanning calorimetry it is shown that polycrystalline tantalum powder does not absorb hydrogen in the temperature range of 0-350°C. The same powder with surface-deposited palladium (0.033%) shows a considerable absorption capacity. The maximum enthalpy of absorption was -517 J g-1. Kinetic analysis of the absorption process shows different rate constants in the first and subsequent hydridings and that absorption takes place in several distinct stages. The activation energies of absorption are relatively small, below 62 kJ mol-1, except for higher values in narrow temperature intervals at the beginning and end of the process. At hydrogen-saturated samples hydride phases are indicated at temperatures below 80°C. By a method of dehydriding of the hydride by oxygen in air at temperatures of 150-160°C, leading to water formation and heat evolution, the ratios H/Ta and H/Pd were determined in several experiments. Depending on the degree of saturation of the hydrides, H/Ta ratios from 4.7 to 20.0 were found, while the H/Pd ratios varied from 8 × 103 to 4 × 104. X-Ray analysis shows that hydriding changes the structure of the powder. The absorption is to be ascribed to the hydrogen spillover effect through palladium. © 1994.
Mioč, U B; Dimitrijević, R Z; Davidović, M; Nedić, Z P; Mitrović, M M; Colomban, Ph.
Thermally induced phase transformations of 12-tungstophosphoric acid 29-hydrate: synthesis and characterization of PW8O26-type bronzes Journal Article
In: Journal of Materials Science, vol. 29, no. 14, pp. 3705-3718, 1994.
@article{Mioč19943705,
title = {Thermally induced phase transformations of 12-tungstophosphoric acid 29-hydrate: synthesis and characterization of PW8O26-type bronzes},
author = {U B Mioč and R Z Dimitrijević and M Davidović and Z P Nedić and M M Mitrović and Ph. Colomban},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028465293&doi=10.1007%2fBF00357338&partnerID=40&md5=9fd14e24fe3d701cd90f886f1ad7184b},
doi = {10.1007/BF00357338},
year = {1994},
date = {1994-01-01},
journal = {Journal of Materials Science},
volume = {29},
number = {14},
pages = {3705-3718},
abstract = {The phase transformations of 12-tungstophosphoric H3PW12O40-29H2O (29-WPA) acid in the temperature range from ambient temperature to 1150°C were investigated and characterized by differential thermal analysis (DTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), infrared (i.r.) and Raman spectroscopies. From room temperature to 550°C, 29-WPA passes through a dehydration process, which characterizes the formation of different crystallohydrates, in anhydrous form as well as "denuded" Keggin's anions, the D-phase (PW12O38). During these processes, Keggin's anions are not disturbed too much and they are preserved up to about 550°C. The "D" phase is transformed by solid-solid recrystallization at about 600°C in a new monophosphate bronze type compound PW8O26. Unit cell dimensions were calculated from XRPD data (ao=0.7515 nm). With the temperature increasing up to 1150°C, novel synthesized cubic bronze passed through three polymorphous phase transitions. According to a general formula for monophosphate tungsten bronzes (WO3)2m (PO4)4 all four polymorphs have m=16. © 1994 Chapman & Hall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The phase transformations of 12-tungstophosphoric H3PW12O40-29H2O (29-WPA) acid in the temperature range from ambient temperature to 1150°C were investigated and characterized by differential thermal analysis (DTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), infrared (i.r.) and Raman spectroscopies. From room temperature to 550°C, 29-WPA passes through a dehydration process, which characterizes the formation of different crystallohydrates, in anhydrous form as well as "denuded" Keggin's anions, the D-phase (PW12O38). During these processes, Keggin's anions are not disturbed too much and they are preserved up to about 550°C. The "D" phase is transformed by solid-solid recrystallization at about 600°C in a new monophosphate bronze type compound PW8O26. Unit cell dimensions were calculated from XRPD data (ao=0.7515 nm). With the temperature increasing up to 1150°C, novel synthesized cubic bronze passed through three polymorphous phase transitions. According to a general formula for monophosphate tungsten bronzes (WO3)2m (PO4)4 all four polymorphs have m=16. © 1994 Chapman & Hall.
Sužnjević, D; Grigorijev, P A; Vučelić, D
Study of LBM interactions with some surface-active substances by the method of capacity minimization Journal Article
In: Bioelectrochemistry and Bioenergetics, vol. 34, no. 1, pp. 19-24, 1994.
@article{Sužnjević199419,
title = {Study of LBM interactions with some surface-active substances by the method of capacity minimization},
author = {D Sužnjević and P A Grigorijev and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028356355&doi=10.1016%2f0302-4598%2894%2980004-9&partnerID=40&md5=32149b841e15638c410e6999e310f03c},
doi = {10.1016/0302-4598(94)80004-9},
year = {1994},
date = {1994-01-01},
journal = {Bioelectrochemistry and Bioenergetics},
volume = {34},
number = {1},
pages = {19-24},
abstract = {The variation in intramembrane potential resulting from the asymmetry of the surface potentials of artificial lipid bilayer membranes (LBMs), formed by phospholipids (phosphatidylcholin and phosphatidylethanolamine) in contact with non-ionic, cationic, anionic and zwitterionic surfactants was followed by the method of capacity minimization. The interaction of different types of surfactants with LBM is specific in nature. The dependence of the shapes of adsorption isotherms constructed from the capacity minimum potentials on surfactant concentration is found to be strongly influenced by the ionic form of the surface-active substances used. © 1994.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The variation in intramembrane potential resulting from the asymmetry of the surface potentials of artificial lipid bilayer membranes (LBMs), formed by phospholipids (phosphatidylcholin and phosphatidylethanolamine) in contact with non-ionic, cationic, anionic and zwitterionic surfactants was followed by the method of capacity minimization. The interaction of different types of surfactants with LBM is specific in nature. The dependence of the shapes of adsorption isotherms constructed from the capacity minimum potentials on surfactant concentration is found to be strongly influenced by the ionic form of the surface-active substances used. © 1994.
Zakrzewska, J; Okon, M; Vučelić, D
1H and 13C NMR assignment of sodium chenodeoxycholate in aqueous solution. Polarization of bile salts steroid nucleus Journal Article
In: Magnetic Resonance in Chemistry, vol. 32, no. 2, pp. 93-96, 1994.
@article{Zakrzewska199493,
title = {1H and 13C NMR assignment of sodium chenodeoxycholate in aqueous solution. Polarization of bile salts steroid nucleus},
author = {J Zakrzewska and M Okon and D Vučelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84989036080&doi=10.1002%2fmrc.1260320206&partnerID=40&md5=c685fa60e8943267dc3bea3e2f050601},
doi = {10.1002/mrc.1260320206},
year = {1994},
date = {1994-01-01},
journal = {Magnetic Resonance in Chemistry},
volume = {32},
number = {2},
pages = {93-96},
abstract = {1H and 13C NMR assignments of sodium chenodeoxycholate in aqueous solution were obtained for three different bile salt concentrations. 1H and 13C NMR chemical shifts of sodium chenodeoxycholate and deoxycholate show slight concentration dependence due to micelle formation. Opposite trends in chemical shifts changes for α‐ and β‐protons cause polarization of the steroid nucleus. Copyright © 1994 John Wiley & Sons Limited},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
1H and 13C NMR assignments of sodium chenodeoxycholate in aqueous solution were obtained for three different bile salt concentrations. 1H and 13C NMR chemical shifts of sodium chenodeoxycholate and deoxycholate show slight concentration dependence due to micelle formation. Opposite trends in chemical shifts changes for α‐ and β‐protons cause polarization of the steroid nucleus. Copyright © 1994 John Wiley & Sons Limited
1993
Ignjatović, L M; Barek, J; Zima, J; Marković, D A
Polarographic behaviour and determination of 1-(4′-bromophenyl)-3,3-dimethyltriazene Journal Article
In: Analytica Chimica Acta, vol. 284, no. 2, pp. 413-418, 1993.
@article{Ignjatović1993413,
title = {Polarographic behaviour and 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-s2.0-0027815256&doi=10.1016%2f0003-2670%2893%2985327-G&partnerID=40&md5=77f061f90cbc7de600610fba4fbb75a0},
doi = {10.1016/0003-2670(93)85327-G},
year = {1993},
date = {1993-01-01},
journal = {Analytica Chimica Acta},
volume = {284},
number = {2},
pages = {413-418},
abstract = {A study was made of the polarographic behaviour of the genotoxic substance 1-(4′-bromopheyl)-3,3-dimethlytriazene and optimum conditions were found for its determination by tast polarography and differential-pulse polarography at a static mercury drop electrode in the concentration range 1 × 10-4-1 × 10-7 mol dm-3. The results indicate that the method can be used at pH between 4.5 and6.0 for the identification and determination of the investigated substance, which is protonated without decomposition in this pH range. It was established that for the reduction of the NN group four electrons are required and the resulting products are 4-bromoaniline and dimethylhydrazine. © 1993.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A study was made of the polarographic behaviour of the genotoxic substance 1-(4′-bromopheyl)-3,3-dimethlytriazene and optimum conditions were found for its determination by tast polarography and differential-pulse polarography at a static mercury drop electrode in the concentration range 1 × 10-4-1 × 10-7 mol dm-3. The results indicate that the method can be used at pH between 4.5 and6.0 for the identification and determination of the investigated substance, which is protonated without decomposition in this pH range. It was established that for the reduction of the NN group four electrons are required and the resulting products are 4-bromoaniline and dimethylhydrazine. © 1993.
Poleksic, L; Zdravkovic, D; Jablanovic, D; Watt, I; Bacic, G
Magnetic resonance imaging of bone destruction in rheumatoid arthritis: comparison with radiography Journal Article
In: Skeletal Radiology, vol. 22, no. 8, pp. 577-580, 1993.
@article{Poleksic1993577,
title = {Magnetic resonance imaging of bone destruction in rheumatoid arthritis: comparison with radiography},
author = {L Poleksic and D Zdravkovic and D Jablanovic and I Watt and G Bacic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027439943&doi=10.1007%2fBF00197138&partnerID=40&md5=9b795a57fcbaef8a6238552be82e81cb},
doi = {10.1007/BF00197138},
year = {1993},
date = {1993-01-01},
journal = {Skeletal Radiology},
volume = {22},
number = {8},
pages = {577-580},
abstract = {Bony changes in forty-four knees of patients with clinically established rheumatoid arthritis (RA) were examined using magnetic resonance imaging (MRI) and plain film radiography. In all cases MRI was clearly superior to radiographs, demonstrating 25 marginal erosions and 42 subchondral cysts, while the number seen on radiographs was 3 and 8, respectively. These results emphasize the problems in visualizing bone erosions in large joints using plain films. MRI is the method of choice for detecting early changes in RA, not only because of its high sensitivity, but also because of the ability of contrast-enhanced MRI to provide physiological characterization of these lesions. © 1993 International Skeletal Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bony changes in forty-four knees of patients with clinically established rheumatoid arthritis (RA) were examined using magnetic resonance imaging (MRI) and plain film radiography. In all cases MRI was clearly superior to radiographs, demonstrating 25 marginal erosions and 42 subchondral cysts, while the number seen on radiographs was 3 and 8, respectively. These results emphasize the problems in visualizing bone erosions in large joints using plain films. MRI is the method of choice for detecting early changes in RA, not only because of its high sensitivity, but also because of the ability of contrast-enhanced MRI to provide physiological characterization of these lesions. © 1993 International Skeletal Society.
Vujisic, B R; Savovic, J J; Pesic, D S; BojoviC, V
Blue (A-X) System of ^ag^&0 moleculel Journal Article
In: Spectroscopy Letters, vol. 26, no. 8, pp. 1529-1535, 1993.
@article{Vujisic19931529,
title = {Blue (A-X) System of ^ag^&0 moleculel},
author = {B R Vujisic and J J Savovic and D S Pesic and V BojoviC},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0005365431&doi=10.1080%2f00387019308011631&partnerID=40&md5=cbd8b5dfd4266660c404805e81159a29},
doi = {10.1080/00387019308011631},
year = {1993},
date = {1993-01-01},
journal = {Spectroscopy Letters},
volume = {26},
number = {8},
pages = {1529-1535},
abstract = {The blue A2II-X2n emission system of the 107Ag18O molecule excited in a low-pressure arc, was recorded in the region 400–475 nm with medium dispersion. The vibrational analysis, supported by isotope shifts study, of the red-degraded bands has been made. The final set of the improved 107Ag16O and the new 107Ag18O vibrational constants of the two sub-systems involved in transition are determined. © 1993, Taylor & Francis Group, LLC. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The blue A2II-X2n emission system of the 107Ag18O molecule excited in a low-pressure arc, was recorded in the region 400–475 nm with medium dispersion. The vibrational analysis, supported by isotope shifts study, of the red-degraded bands has been made. The final set of the improved 107Ag16O and the new 107Ag18O vibrational constants of the two sub-systems involved in transition are determined. © 1993, Taylor & Francis Group, LLC. All rights reserved.
Šušić, M V; Maričić, A M
In: Journal of Materials Science, vol. 28, no. 12, pp. 3161-3167, 1993.
@article{Šušić19933161,
title = {Spillover effect in the hydrogen absorption by the polycrystalline powder alloy FeNi1.75Cu1.5Mo0.5 and electric conductivity of the pressed powder},
author = {M V Šušić and A M Maričić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027610393&doi=10.1007%2fBF00354231&partnerID=40&md5=bc0329d4877c805bf478d215648f7542},
doi = {10.1007/BF00354231},
year = {1993},
date = {1993-01-01},
journal = {Journal of Materials Science},
volume = {28},
number = {12},
pages = {3161-3167},
abstract = {The process of hydrogen absorption by the FeNi1.75Cu1.5Mo0.5 alloy in the polycrystalline form was investigated for both the pure and palladized forms (0.008 76% Pd) at temperatures from ambient to 600 °C in a hydrogen flow. Using differential scanning calorimetry, (DSC) thermogravimetry (TG) and X-ray diffraction, the influence of palladization on the hydrogen absorption was demonstrated. Kinetic analysis of the DSC thermograms, the kinetic and thermic parameters of hydrogen absorption were determined. The TG thermograms showed that on hydrogen absorption a weight change took place due to water formation and reduction of the oxide film at the surface of the powder particles. The activation energies of hydrogen absorption were 170 kJ mol-1 for the original powder and 32 kJ mol-1 for the palladized one. The enthalpies of the absorption ranged from ΔH = -5 to ΔH = -380 J g-1 for the original and palladized powder, respectively. The rate constants of the absorption depended on the palladization and were found to be 0.03 and 1.20 s-1, respectively, at 162 °C. The electric conductivity of the pressed powder (9 kbar) increases on heating in both air and a hydrogen atmosphere up to 600 °C, tending to a constant value. The changes of the parameters characteristic of the palladized form are ascribed to the mechanism of a hydrogen spillover effect due to the presence of palladium. © 1993 Kluwer Academic Publishers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The process of hydrogen absorption by the FeNi1.75Cu1.5Mo0.5 alloy in the polycrystalline form was investigated for both the pure and palladized forms (0.008 76% Pd) at temperatures from ambient to 600 °C in a hydrogen flow. Using differential scanning calorimetry, (DSC) thermogravimetry (TG) and X-ray diffraction, the influence of palladization on the hydrogen absorption was demonstrated. Kinetic analysis of the DSC thermograms, the kinetic and thermic parameters of hydrogen absorption were determined. The TG thermograms showed that on hydrogen absorption a weight change took place due to water formation and reduction of the oxide film at the surface of the powder particles. The activation energies of hydrogen absorption were 170 kJ mol-1 for the original powder and 32 kJ mol-1 for the palladized one. The enthalpies of the absorption ranged from ΔH = -5 to ΔH = -380 J g-1 for the original and palladized powder, respectively. The rate constants of the absorption depended on the palladization and were found to be 0.03 and 1.20 s-1, respectively, at 162 °C. The electric conductivity of the pressed powder (9 kbar) increases on heating in both air and a hydrogen atmosphere up to 600 °C, tending to a constant value. The changes of the parameters characteristic of the palladized form are ascribed to the mechanism of a hydrogen spillover effect due to the presence of palladium. © 1993 Kluwer Academic Publishers.
Sabo, T; Juranić, N; Dondur, V; Ćelap, M B
In: Thermochimica Acta, vol. 213, no. C, pp. 293-304, 1993.
@article{Sabo1993293,
title = {A kinetic investigation of the tris(4-morpholinecarbodithionato-S,S') cobalt(III) complex formation by the intralattice and interlattice reactions},
author = {T Sabo and N Juranić and V Dondur and M B Ćelap},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-4243322238&doi=10.1016%2f0040-6031%2893%2980023-4&partnerID=40&md5=03005f3c73148e0da451895265ea06b6},
doi = {10.1016/0040-6031(93)80023-4},
year = {1993},
date = {1993-01-01},
journal = {Thermochimica Acta},
volume = {213},
number = {C},
pages = {293-304},
abstract = {The kinetics of tris-(4-morpholinecarbodithionato-S,S) cobalt(III) formation by the intralattice and interlattice reactions of hexaaminecobalt(III) cation with dithiocarbamato anion was investigated under isothermal conditions. The intralattice reaction, conducted in the solid hexaaminecobalt(III) 4-morpholinecarbodithionate salt, proceeded well at temperatures of 50-80°C, conforming to the phase boundary Rn reaction mechanism (Ea = 92.6 kJ mol-1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The kinetics of tris-(4-morpholinecarbodithionato-S,S) cobalt(III) formation by the intralattice and interlattice reactions of hexaaminecobalt(III) cation with dithiocarbamato anion was investigated under isothermal conditions. The intralattice reaction, conducted in the solid hexaaminecobalt(III) 4-morpholinecarbodithionate salt, proceeded well at temperatures of 50-80°C, conforming to the phase boundary Rn reaction mechanism (Ea = 92.6 kJ mol-1
Ignjatović, L M; Marković, D A; Veselinović, D S; Bešić, B R
Polarographic behavior and determination of some S‐triazine herbicides Journal Article
In: Electroanalysis, vol. 5, no. 5-6, pp. 529-533, 1993.
@article{Ignjatović1993529,
title = {Polarographic behavior and determination of some S‐triazine herbicides},
author = {L M Ignjatović and D A Marković and D S Veselinović and B R Bešić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987467022&doi=10.1002%2felan.1140050525&partnerID=40&md5=c6b897ac1279838f355b336c0b03907f},
doi = {10.1002/elan.1140050525},
year = {1993},
date = {1993-01-01},
journal = {Electroanalysis},
volume = {5},
number = {5-6},
pages = {529-533},
abstract = {The possibility for differential pulse polarography (DPP) determination of S‐triazine has been shown and compared with gas‐chromatographic (GC) measurements. Good agreement was found between GC and DPP measurements in analyzing 20 samples of industrial wastewater. It was found, using controlled potential coulometry (CPC), that four electrons take part in electrochemical reduction steps. On the basis of this and polarographic measurements, the mechanism of electrochemical reduction of S‐triazine was postulated. Copyright © 1993 VCH Publishers, Inc.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The possibility for differential pulse polarography (DPP) determination of S‐triazine has been shown and compared with gas‐chromatographic (GC) measurements. Good agreement was found between GC and DPP measurements in analyzing 20 samples of industrial wastewater. It was found, using controlled potential coulometry (CPC), that four electrons take part in electrochemical reduction steps. On the basis of this and polarographic measurements, the mechanism of electrochemical reduction of S‐triazine was postulated. Copyright © 1993 VCH Publishers, Inc.
Tjapkin, N; Davidović, M; Colomban, Ph.; Mioč, U
Complex dielectric permittivity, bulk and surface conductivity of 12-tungstophosphoric acid hexahydrate and its dehydrated forms Journal Article
In: Solid State Ionics, vol. 61, no. 1-3, pp. 179-185, 1993.
@article{Tjapkin1993179,
title = {Complex dielectric permittivity, bulk and surface conductivity of 12-tungstophosphoric acid hexahydrate and its dehydrated forms},
author = {N Tjapkin and M Davidović and Ph. Colomban and U Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027597124&doi=10.1016%2f0167-2738%2893%2990352-4&partnerID=40&md5=be5dc83983d014a4add5c7c785d19da4},
doi = {10.1016/0167-2738(93)90352-4},
year = {1993},
date = {1993-01-01},
journal = {Solid State Ionics},
volume = {61},
number = {1-3},
pages = {179-185},
abstract = {Impedance measurements on pelletised 12-tungstophosphoric acid hydrates were performed in the frequency range 20 Hz-1 GHz, at temperatures from 20°C to 400°C, in the air of different humidities. Both the dielectric relaxations and conductivity of hexahydrate vary with the amount of water in surface layer. Bulk protonic conductivity of hexahydrate at room temperature was found to be about 3 × 10-11 S cm-1. Interesting behaviour of conductivity of anhydrous samples was observed. © 1993.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Impedance measurements on pelletised 12-tungstophosphoric acid hydrates were performed in the frequency range 20 Hz-1 GHz, at temperatures from 20°C to 400°C, in the air of different humidities. Both the dielectric relaxations and conductivity of hexahydrate vary with the amount of water in surface layer. Bulk protonic conductivity of hexahydrate at room temperature was found to be about 3 × 10-11 S cm-1. Interesting behaviour of conductivity of anhydrous samples was observed. © 1993.
1992
Fejzo, J; Westler, W M; Markley, J L; Macura, S
In: Journal of the American Chemical Society, vol. 114, no. 4, pp. 1523-1524, 1992.
@article{Fejzo19921523,
title = {Complete Elimination of Spin Diffusion from Selected Resonances in Two-Dimensional Cross-Relaxation Spectra of Macromolecules by a Novel Pulse Sequence (SNOESY)},
author = {J Fejzo and W M Westler and J L Markley and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001308804&doi=10.1021%2fja00030a082&partnerID=40&md5=e6ceb6f6d053790ac903cf424eef23c7},
doi = {10.1021/ja00030a082},
year = {1992},
date = {1992-01-01},
journal = {Journal of the American Chemical Society},
volume = {114},
number = {4},
pages = {1523-1524},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Šušić, M V
Spill-over process of hydrogen sorption on palladized alumina, yttria and zeolite 4A Journal Article
In: Journal of Materials Science, vol. 27, no. 14, pp. 3733-3742, 1992.
@article{Šušić19923733,
title = {Spill-over process of hydrogen sorption on palladized alumina, yttria and zeolite 4A},
author = {M V Šušić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-3743115267&doi=10.1007%2fBF00545449&partnerID=40&md5=f91855df1d680d3e024730781cfd7ed7},
doi = {10.1007/BF00545449},
year = {1992},
date = {1992-01-01},
journal = {Journal of Materials Science},
volume = {27},
number = {14},
pages = {3733-3742},
abstract = {Doping of alumina, yttria and zeolite 4A with small quantities of palladium (down to 0.025%) was done. It was shown that these oxides, which do not normally absorb hydrogen, after the doping acquire a considerable capacity for hydrogen absorption. The sorption of hydrogen is occurring by the spill-over effect from metallic palladium to the oxide. The process is exothermal, taking place in two stages between 60 and 350 °C. Activation energies of the first stage range from 120 to 167 kJ mol-1 and for the second one from 20 to 30 kJ mol-1. After cooling to room temperature in hydrogen flow, the samples are able to absorb considerable quantities of oxygen which reacts exothermally with the previously formed hydride. On next exposition to hydrogen, a vigorous reaction of it with the adsorbed oxygen is taking place already at room temperature. Enthalpies of hydrogen absorption, - ΔH, are of the order of 10 kJ g-1, showing a tendency of increase after repeated exposures to hydrogen. © 1992 Chapman & Hall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Doping of alumina, yttria and zeolite 4A with small quantities of palladium (down to 0.025%) was done. It was shown that these oxides, which do not normally absorb hydrogen, after the doping acquire a considerable capacity for hydrogen absorption. The sorption of hydrogen is occurring by the spill-over effect from metallic palladium to the oxide. The process is exothermal, taking place in two stages between 60 and 350 °C. Activation energies of the first stage range from 120 to 167 kJ mol-1 and for the second one from 20 to 30 kJ mol-1. After cooling to room temperature in hydrogen flow, the samples are able to absorb considerable quantities of oxygen which reacts exothermally with the previously formed hydride. On next exposition to hydrogen, a vigorous reaction of it with the adsorbed oxygen is taking place already at room temperature. Enthalpies of hydrogen absorption, - ΔH, are of the order of 10 kJ g-1, showing a tendency of increase after repeated exposures to hydrogen. © 1992 Chapman & Hall.
Tkalčce, E; Šenija, D; Dondur, V; Petranović, N
Influence of Dopants on Nucleation and Growth of High‐Quartz Solid Solution in Lithium Aluminosilicate Glass Journal Article
In: Journal of the American Ceramic Society, vol. 75, no. 7, pp. 1958-1963, 1992.
@article{Tkalčce19921958,
title = {Influence of Dopants on Nucleation and Growth of High‐Quartz Solid Solution in Lithium Aluminosilicate Glass},
author = {E Tkalčce and D Šenija and V Dondur and N Petranović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0344407927&doi=10.1111%2fj.1151-2916.1992.tb07223.x&partnerID=40&md5=293c3bd7a093760879483bd7f9f81d53},
doi = {10.1111/j.1151-2916.1992.tb07223.x},
year = {1992},
date = {1992-01-01},
journal = {Journal of the American Ceramic Society},
volume = {75},
number = {7},
pages = {1958-1963},
abstract = {The kinetic parameters of nucleation and crystal growth of high‐quartz solid solution in multicomponent lithium aluminosilicate glasses doped with various transition‐metalions were studied by nonisothermal DTA. The crystallization of glasses nucleated at different temperatures was carried out, and plots of the DTA peak versus the nucleation temperatures were used to determine the maximum nucleation rate temperature. Peak temperature data of nucleated samples at varying heating rates (5–20 K/min) were used to determine the activation energy for crystallization via the JMA equation. The temperature of maximum nucleation rate depends greatly on the doped transition‐ metal ions present. The activation energy for crystallization obtained for undoped glass or glasses doped with Fe2O3 is of the same order as that already published, and the Avrami exponent is consistent with predominantly three‐dimensional crystal growth. The much higher activation energy values for glasses doped with CoO could be a consequence of two crystallization processes proceeding simultaneously. Copyright © 1992, Wiley Blackwell. All rights reserved},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The kinetic parameters of nucleation and crystal growth of high‐quartz solid solution in multicomponent lithium aluminosilicate glasses doped with various transition‐metalions were studied by nonisothermal DTA. The crystallization of glasses nucleated at different temperatures was carried out, and plots of the DTA peak versus the nucleation temperatures were used to determine the maximum nucleation rate temperature. Peak temperature data of nucleated samples at varying heating rates (5–20 K/min) were used to determine the activation energy for crystallization via the JMA equation. The temperature of maximum nucleation rate depends greatly on the doped transition‐ metal ions present. The activation energy for crystallization obtained for undoped glass or glasses doped with Fe2O3 is of the same order as that already published, and the Avrami exponent is consistent with predominantly three‐dimensional crystal growth. The much higher activation energy values for glasses doped with CoO could be a consequence of two crystallization processes proceeding simultaneously. Copyright © 1992, Wiley Blackwell. All rights reserved
Macura, S; Fejzo, J; Hoogstraten, C G; Westler, W M; Markley, J L
Topological Editing of Cross‐Relaxation Networks Journal Article
In: Israel Journal of Chemistry, vol. 32, no. 2-3, pp. 245-256, 1992.
@article{Macura1992245,
title = {Topological Editing of Cross‐Relaxation Networks},
author = {S Macura and J Fejzo and C G Hoogstraten and W M Westler and J L Markley},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85005665533&doi=10.1002%2fijch.199200031&partnerID=40&md5=70e4fece27d4f026e07a97eea9a1758b},
doi = {10.1002/ijch.199200031},
year = {1992},
date = {1992-01-01},
journal = {Israel Journal of Chemistry},
volume = {32},
number = {2-3},
pages = {245-256},
abstract = {We have used the elements of graph theory to describe NMR cross‐relaxation networks in macromolecules and to analyze different experiments used for topological editing. We propose a new experiment, block decoupled NOESY (B.D. NOESY), that splits the cross‐relaxation network of a macromolecular system into two noninteracting subdomains. Splitting is achieved by arranging for the effective z‐components of the magnetization in one subdomain, as viewed from the other subdomain, to be zero. The B.D. NOESY experiment, in favorable cases, can usefully simplify the analysis of cross‐relaxation spectra by removing certain ambiguities. We demonstrate the method by separating the aromatic resonances from the rest of the cross‐relaxation network of a small globular protein: turkey ovomucoid third domain, Mr 6000. The resulting spectrum provides a clearer picture of cross‐relaxation pathways that involve only aromatic or only aliphatic spins. By comparing the B.D. NOESY spectrum with the normal NOESY spectrum, we were able to identify cross peaks that contain contributions from indirect magnetization transfer (spin diffusion) mediated by the aromatic side chains. In the terminology of graph theory, these experiments decompose topological networks of cross‐relaxation into two subgraphs, the join of which generates the original graph. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have used the elements of graph theory to describe NMR cross‐relaxation networks in macromolecules and to analyze different experiments used for topological editing. We propose a new experiment, block decoupled NOESY (B.D. NOESY), that splits the cross‐relaxation network of a macromolecular system into two noninteracting subdomains. Splitting is achieved by arranging for the effective z‐components of the magnetization in one subdomain, as viewed from the other subdomain, to be zero. The B.D. NOESY experiment, in favorable cases, can usefully simplify the analysis of cross‐relaxation spectra by removing certain ambiguities. We demonstrate the method by separating the aromatic resonances from the rest of the cross‐relaxation network of a small globular protein: turkey ovomucoid third domain, Mr 6000. The resulting spectrum provides a clearer picture of cross‐relaxation pathways that involve only aromatic or only aliphatic spins. By comparing the B.D. NOESY spectrum with the normal NOESY spectrum, we were able to identify cross peaks that contain contributions from indirect magnetization transfer (spin diffusion) mediated by the aromatic side chains. In the terminology of graph theory, these experiments decompose topological networks of cross‐relaxation into two subgraphs, the join of which generates the original graph. Copyright © 1992 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
Šušić, M V; Maričić, A M; Dimitrijević, R Ž
Correlation between thermal, kinetic, magnetic and electric effects in the crystallization process of amorphous magnetic alloys Journal Article
In: Materials Chemistry and Physics, vol. 30, no. 4, pp. 221-227, 1992.
@article{Šušić1992221,
title = {Correlation between thermal, kinetic, magnetic and electric effects in the crystallization process of amorphous magnetic alloys},
author = {M V Šušić and A M Maričić and R Ž Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0026819284&doi=10.1016%2f0254-0584%2892%2990228-Z&partnerID=40&md5=41b3c88b5f6157160123b961b06eb65a},
doi = {10.1016/0254-0584(92)90228-Z},
year = {1992},
date = {1992-01-01},
journal = {Materials Chemistry and Physics},
volume = {30},
number = {4},
pages = {221-227},
abstract = {By use of differential scanning calorimetry the mechanism of crystallization (devitrification) was investigated for magnetic amorphous alloys of compositions Fe82B13Si5 (A) and Fe75B10Si15 (B) in the temperature range between ambient and 600 °C. It was shown that both alloys crystallize in two stages between 480° and 520 °C. The energies of activation of the process},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By use of differential scanning calorimetry the mechanism of crystallization (devitrification) was investigated for magnetic amorphous alloys of compositions Fe82B13Si5 (A) and Fe75B10Si15 (B) in the temperature range between ambient and 600 °C. It was shown that both alloys crystallize in two stages between 480° and 520 °C. The energies of activation of the process
Isernia, C; Paolillo, L; Russo, E; Pastore, A; Zanotti, G; Macura, S
Evaluation of errors of interproton distances and correlation time determined from NMR cross-relaxation rates Journal Article
In: Journal of Biomolecular NMR, vol. 2, no. 6, pp. 573-582, 1992.
@article{Isernia1992573,
title = {Evaluation of errors of interproton distances and correlation time determined from NMR cross-relaxation rates},
author = {C Isernia and L Paolillo and E Russo and A Pastore and G Zanotti and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0002121073&doi=10.1007%2fBF02192846&partnerID=40&md5=94c6886b07eb8d25c548564021621c34},
doi = {10.1007/BF02192846},
year = {1992},
date = {1992-01-01},
journal = {Journal of Biomolecular NMR},
volume = {2},
number = {6},
pages = {573-582},
abstract = {We have analyzed a combined use of the two-dimensional nuclear Overhauser effect in the laboratory frame (NOESY) and in the rotating frame (ROESY) to determine interproton distances and correlation time in medium-sized rigid molecules (Davis, 1987). This method can be applied in the intermediate motional regime, 0.2 < ωoτc, < 5, (τc, correlation time, (ωo resonance frequency). Error limits depend on the motional regime and are smallest near ωoτc=1.14. The method was tested on six geminal proton pairs in the bicyclic octapeptide (S-deoxo-γ-[R]-OH-Ile3 amaninamide},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have analyzed a combined use of the two-dimensional nuclear Overhauser effect in the laboratory frame (NOESY) and in the rotating frame (ROESY) to determine interproton distances and correlation time in medium-sized rigid molecules (Davis, 1987). This method can be applied in the intermediate motional regime, 0.2 < ωoτc, < 5, (τc, correlation time, (ωo resonance frequency). Error limits depend on the motional regime and are smallest near ωoτc=1.14. The method was tested on six geminal proton pairs in the bicyclic octapeptide (S-deoxo-γ-[R]-OH-Ile3 amaninamide
1991
Fejzo, J; Westler, W M; Macura, S; Markley, J L
Elimination of chemical-exchange-mediated spin diffusion from exchange spectra of macromolecules. Exchange-decoupled NOESY (XD-NOESY) Journal Article
In: Journal of Magnetic Resonance (1969), vol. 92, no. 1, pp. 195-202, 1991.
@article{Fejzo1991195,
title = {Elimination of chemical-exchange-mediated spin diffusion from exchange spectra of macromolecules. Exchange-decoupled NOESY (XD-NOESY)},
author = {J Fejzo and W M Westler and S Macura and J L Markley},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001645579&doi=10.1016%2f0022-2364%2891%2990262-R&partnerID=40&md5=3d953235ca69e0f970a300671527caf1},
doi = {10.1016/0022-2364(91)90262-R},
year = {1991},
date = {1991-01-01},
journal = {Journal of Magnetic Resonance (1969)},
volume = {92},
number = {1},
pages = {195-202},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vukelić, N; Antić-Jovanović, A; Pešić, D S
Franck-Condon Factors and r-Centroids of the B-X Bands of BeI8O Molecule Journal Article
In: Spectroscopy Letters, vol. 24, no. 4, pp. 519-524, 1991.
@article{Vukelić1991519,
title = {Franck-Condon Factors and r-Centroids of the B-X Bands of BeI8O Molecule},
author = {N Vukelić and A Antić-Jovanović and D S Pešić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79953238512&doi=10.1080%2f00387019108018135&partnerID=40&md5=2d72ad6ca173e12c988c7058d85f94a6},
doi = {10.1080/00387019108018135},
year = {1991},
date = {1991-01-01},
journal = {Spectroscopy Letters},
volume = {24},
number = {4},
pages = {519-524},
abstract = {The Franck-Condon factors, qv’,v., and r-centroids, rv’., for the bands of the B1Σ+-X1Σ+transition of Bel8O molecule (420–520 nm) are determined. A comparison of calculated qv’. values with the experimental estimated intensities of the bands shows reasonable agreement. © 1991, Taylor & Francis Group, LLC. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Franck-Condon factors, qv’,v., and r-centroids, rv’., for the bands of the B1Σ+-X1Σ+transition of Bel8O molecule (420–520 nm) are determined. A comparison of calculated qv’. values with the experimental estimated intensities of the bands shows reasonable agreement. © 1991, Taylor & Francis Group, LLC. All rights reserved.