Summary
The changes in respiration and glycolysis of whole oocytes and homogenates of oocytes during oogenesis have been studied.
The respiration rate of whole oocytes increases during oocyte growth and decreases during oocyte maturation. The respiration rate of homogenates also increases during oocyte growth and does not change during egg maturation. At all oogenesis stages the respiration rate of homogenates is higher than the respiration rate of whole oocytes.
Respiration intensity increases during the small growth stage and decreases during the following stages of oogenesis. Respiration intensity of homogenates under optimal conditions changes in a similar way. Respiration intensity under physiological conditions diminishes during oogenesis from 70% at the small growth stage to 42% in unfertilised eggs.
The rate of glycolysis in whole oocytes and homogenates of oocytes increases during the growth period of oocytes but does not change during egg maturation.
Glycolysis intensity of the whole oocytes increases at the large growth stage—stage of cytoplasmic vacuolisation—and becomes less during the following stages. Glycolysis intensity in homogenates under optimal conditions is much higher than the glycolysis intensity of whole oocytes and it decreases slightly during oogenesis. The efficiency of glycolysis in oocytes under physiological conditions is very low. It increases from the stage of cytoplasmic vacuolisation (3.6%) to the stage at which vitellogenesis starts (20%) and diminishes at the following stages.
The data obtained are considered in the light of the Prigogine and Wiame interpretation of a thermodynamic theory of development.
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Ozernyuk, N.D., Zotin, A.I. & Yurowitzky, Y.G. Deviation of the living system from the stationary state during oogenesis. W. Roux' Archiv f. Entwicklungsmechanik 172, 66–74 (1973). https://doi.org/10.1007/BF00581885
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DOI: https://doi.org/10.1007/BF00581885