Authors:V. P. Korolev, O. A. Antonova, and N. L. Smirnova
series, namely: glycine, l -alanine, and l -proline. However, the solubility of proline in water is much higher than even glycine and its enthalpy of solution in water is exothermic unlike other amino acids. It was shown that in terms of heat capacity
Authors:Bogdan Jurca, Carmen Paraschiv, Adelina Ianculescu, and Oana Carp
Bismuth ferrite (BiFeO3) was obtained by a combustion reaction staring from two precursors systems, namely Fe(NO3)3 · 9H2O–Bi5O(OH)9(NO3)4 · 9H2O–glycine/urea with different metal nitrate/fuel molar ratios. The precursors’ thermal behavior is dependent on the fuel nature
but practically independent to the fuel content. In glycine containing systems not all Bi2O3 is included into mixed oxides during the decomposition. Its presence was identified through the existence of two endothermic
phase transitions (TDTA max at 745 and 818 °C) assigned to Bi2O3 α→δ transition, and its melting. The thermal investigations performed on oxides samples reveal for all oxides, independent
on the precursor system, a similar behavior. For all the oxides was identified both the Curie temperature (which decreases
with the annealing cycles) and the incongruent melting point (which is with ~10 °C higher for glycine generated oxides comparative
with urea ones). The structural analysis shows in the case of the oxides prepared using urea as fuel, a faster evolution toward
a single phase composition with the temperature, the formation of the BiFeO3 perovskite phase being completed in the temperature range of 500–550 °C. Only some traces of Bi36Fe2O57 were identified at the detection limit. TEM analysis performed on the BiFeO3 thermally treated at 500 °C for 3 h revealed the presence of small particles with an average size of ~33 nm and polycrystalline
agglomerates with an average size of ~100 nm for glycine/urea derived oxides.
Authors:Zh. F. Gesse, G. I. Repkin, V. A. Isaeva, and V. A. Sharnin
Sufficient amount of information about enthalpy changes of reactions in water was accumulated for complex formation between transition metals ions and amino acids anions and glycine-ion [ 1 – 3 ] and for complex formation of glycine and
Authors:J. Pâun, M. Ghazi, I. Mihalcea, S. Jipa, and M. Contineanu
The radiothermoluminescence /RTL/ of glycine and its dependence on the crystallite size and on the presence of various impurities were investigated. In order to determine the nature of electron traps, ESR measurements have also been performed. The possible RTL mechanism is discussed.
Agboma, P. C., Jones, M. G. K., Peltonen-Sainio, P., Rita, H. and Pehu, E. (1997): Exogenous glycine betaine enhances grain yield of maize, sorghum and wheat grown under two supplementary watering regimes
A new method of synthesis of phenyl glycine labelled with deuterium and tritium was elaborated. Labelled phenyl glycine was obtained by isotope exchange method between phenyl glycine and deuterated or tritiated water at elevated temperature in hydrochloric acid medium using K2PtCl4 as a catalyst. 37 GBq /1 Ci/ HTO was used for the synthesis of tritiated phenyl glycine and labelled product with specific activity of 185 MBq/mole /5 mCi/mole/ was obtained.