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- W2019580111 abstract "In the present study quantitative cytochemical assays were used to measure some enzymatic activities in situ in bovine meiotically immature oocytes and oocytes matured in vitro, since the special metabolic activity of the growing oocytes may be a pivotal factor in stabilizing the meiotically arrested oocytes. Modifications of this particular metabolism might destabilize the arrested meiosis. Preovulatory oocytes, mostly at the germinal vesicle stage, were obtained by puncturing follicles ranging from 2 to 6 mm in diameter with a hypodermic needle. A group of collected oocytes was incubated in maturation medium CRML 1066 to obtain metaphase II oocytes. Succinate, lactate and glucose-6-phosphate dehydrogenase activities in just collected meiotically immature and in vitro matured oocytes were assayed cytochemically. Microdensitometric measurements were made with a Vickers M85a scanning microdensitometer. Our findings show that: 1) succinate dehydrogenase activity was significantly increased in matured oocytes; 2) lactate dehydrogenase activity was present and very strong in immature oocytes but was detectable in only about 50% of matured oocytes, with significantly lower integrated optical density values; 3) glucose-6-phosphate dehydrogenase activity was very high in immature oocytes but significantly decreased after in vitro maturation; 4) there was no linear correlation between the integrated optical densities of the three enzymatic activities and the diameters of the oocytes. We suggest that the ability to utilize glucose may appear earlier in bovine oocytes than in other species and takes place at the time of maturation." @default.
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- W2019580111 date "1993-09-01" @default.
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- W2019580111 title "Quantitative cytochemical study of some enzymatic activities in preovulatory bovine oocytes after in vitro maturation" @default.
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- W2019580111 doi "https://doi.org/10.1016/s0065-1281(11)80394-6" @default.
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