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N I Zhuravleva

Publications and source records attributed to N I Zhuravleva.

13 recordsLinked to original sources
PubMed1990

[Optimization of the conditions for the immunochemical nephelometric analysis of IgG, IgA and IgM].

Immunonephelometric analysis (INA) is widely used in practical chemistry. the authors have examined the possibility of using Soviet reagents in an ICS Analyzer Beckman (USA) nephelometer. The effects of polyethylene glycol concentration, the reaction buffer pH and ionic strength on the results of INA were under study. Optimal conditions for INA with the test systems anti-IgA-IgA, anti-IgG-IgG, and anti-IgM-IgM with Soviet reagents have been developed. Lyophilized immunoreagents from the Mancini radial immunodiffusion kit, prepared at the N. F. Gamaleia Research Institute for Epidemiology and Microbiology, can be employed for analysis with this nephelometer.

Evaluation Studies as Topic↗
PubMedDate not supplied

[In vitro maturation of cattle oocytes taken from ovaries with different morphofunctional states].

We studied the capacity of cattle oocytes taken from ovaries with different morphofunctional state for development to metaphase 2 in vitro. A classification of ovaries has been proposed according to their morphofunctional state: (1) ovaries with a yellow body from the last cycle, without dominating follicle, with many follicles of varying diameter; (2) ovaries with a yellow body from the last cycle, with dominating follicle (from 10 mm in diameter); (3) ovaries with a large functioning yellow body and follicles of varying diameter; (4) ovaries with a follicular cystoid formation (more than 25 mm in diameter); (5) ovaries with a yellow body from past cycles and small (1-2 mm) follicles, supposedly with a weakened hormonal function. It was shown that the morphofunctional state of ovaries determined the total number of oocytes isolated from an ovary and number of morphologically normal oocytes feasible for cultivation. At the same time, no reliable differences in the capacity for extrusion of the first polar body between the oocytes from the ovaries of different types were found in the experiments on in vitro oocytes maturation. Since the coefficient of correlation between the extrusion of the first polar body and maturation to metaphase 2 was in 0.95, there is every reason to believe that the capacity for development to metaphase 2 does not depend on the morphofunctional state of ovaries.

Animals↗
PubMedDate not supplied

[Properties and prospects of practical use of extracellular L-glutamate oxidase from Streptomyces sp. Z-11-6].

The properties of extracellular L-glutamate oxidase, isolated and purified from Streptomyces sp. Z-11-6 (specific activity, 50.8 U/mg protein; yield, 40%), were studied. A photometrical method of determination of activities of alanine- and aspartate aminotransferases, based on the use of the L-glutamate oxidase and peroxidase, has been developed. This method is sufficiently sensitive to be used for the determination of aminotransferase activities in biological fluids. The presence of other amino acids did not interfere with the analysis and had no effect on the results of determination.

Alanine Transaminase↗