Enthalpies and heat capacities of interaction of tetraalkylammonium bromides with hexamethylphosphoric triamide in water, methanol and ethylene glycol: The comparative analysis of aqueous and non-aqueous systems

2012 ◽  
Vol 544 ◽  
pp. 84-88 ◽  
Author(s):  
Andrey V. Kustov ◽  
Nataliya L. Smirnova ◽  
Olga A. Antonova
Keyword(s):  
Comparative Analysis ◽  
Ethylene Glycol ◽  
Heat Capacities ◽  
Aqueous Systems ◽  
Hexamethylphosphoric Triamide ◽  
Tetraalkylammonium Bromides

Heat capacities and volumes of some non-electrolytes in N,N-dimethylformamide at 298.15 K

1987 ◽  
Vol 65 (12) ◽  
pp. 2810-2814 ◽  
Author(s):  
Henryk Piekarski
Keyword(s):  
Ethylene Glycol ◽  
Heat Capacities ◽  
Scaled Particle Theory ◽  
Partial Molal Volume ◽  
Cavity Formation ◽  
Particle Theory ◽  
Molal Volume ◽  
Analogous Data ◽  
Other Substances ◽  
Apparent Molal Heat Capacities

Heat capacities and densities of dilute solutions of formamide, acetone, tetrahydrofuran, ethylene glycol, 2-methoxyethanol, and 2-ethoxyethanol in N,N-dimethylformamide were determined at 298.15 K. Apparent molal heat capacities and volumes for these solutes in DMF were calculated and compared with the analogous data for other substances in DMF solution as well as with the data concerning solutions in methanol and water. Heat capacities of cavity formation (ΔCcav) in DMF were calculated on the basis of the Scaled Particle Theory. ΔCcav appeared to be linearly correlated with the standard partial molal volume of corresponding solutes in DMF. Similar dependences were also found for aqueous and methanolic solutions of the non-electrolytes.

scholarly journals Biotechnological approaches to the preservation and use of bovine ovarian cumulus-oocyte complexes in the system of reproductive technologies

2020 ◽  
Vol 7 (3) ◽  
pp. 54-61
Author(s):  
P. A. Trotskyi ◽  
O. V. Shcherbak ◽  
I. M. Lyuta
Keyword(s):  
Comparative Analysis ◽  
Ethylene Glycol ◽  
Data Processing ◽  
Statistical Methods ◽  
Statistical Data ◽  
Experimental Studies ◽  
Reproductive Technologies ◽  
Lower Toxicity ◽  
Further Development

Aim. To study the effect of different concentrations of ethylene glycol and glycerin in equilibration and vitrifi cation solutions on 1) the viability and further development of frozen-thawed bovine ovarian cumulus-oocyte complexes (COCs), cryopreserved by vitrifi cation method, 2) on the effectiveness of inseminating mature oocytes, obtained from them, and 3) on the formation of embryos. Methods. Biotechnological, cryobiological, morphological, cytogenetic, and statistical methods, as well as methods of statistical data processing were used in the research. Results. The results of experimental studies on the effect of different concentrations of ethylene glycol and glycerin in the equilibration solution during cryopreservation of bovine ovarian COCs (n = 502) on their viability and further development after freezing-thawing are presented. We also show the results of the comparative analysis of cryoresistant properties of bovine ovarian COCs (n = 560) using different concentrations of ethylene glycol and glycerin, as cryoprotectants, in the vitrifi cation solution in terms of the viability and maturation of the oocytes, which originated from these COCs, up to metaphase II of meiosis. A comparative analysis of the application of ethylene glycol and glycerol in differ- ent concentrations for the equilibration and vitrifi cation solutions in cryopreserving bovine ovarian COCs (n = 220) demonstrated a relationship between the level of concentration of these cryoprotectants and the number of embryos after in vitro insemination of mature gametes, obtained from these frozen-thawed COCs. Conclusions. It was found that the use of 25 % ethylene glycol and 5 % glycerin in the equilibration solution and 10 % ethylene glycol and 40 % glycerin in the vitrifi cation solution during cryopreservation of bovine ovarian COCs ensures lower toxicity of these solutions and promotes more effi cient (up to 14.3 %) formation and development of embryos after in vitro insemina- tion of mature gametes, obtained from these COCs

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