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Temperature dependence of oocyte cleavage in 3 thermophilically different frogs of the genus rana



Temperature dependence of oocyte cleavage in 3 thermophilically different frogs of the genus rana



Journal of Thermal Biology 4(1): 57-62



The duration of the mitotic cycle (.tau.o) at different temperatures at the time of synchronous cleavage division of oocytes of frogs R. temporaria L., R. arvalis Nills. (= R. terrestris Andr.) and R. ridibunda Pall. was studied. The 1st sp. is the least, and the last the most, thermophilic. In the semilog scale, the dependence of .tau.o on temperature is linear in the middle of the temperature scale, and is limited on both sides by inflexion points. This zone comprises the temperatures at which the larvae develop normally. For R. temporaria these temperatures are between 11-23.degree. C, for R. arvalis 13-24.degree. C and for R. ridibunda 16-27.degree. C. At the midpoints of each zone (17.5, 18.5 and 21.5.degree. C, respectively) there is no difference in .tau.o between the species. At the same temperature the mitotic cycle is the shortest for R. temporaria, is somewhat longer for R. arvalis and is the longest for R. ridibunda. The difference in the optimal temperature zones agree with different thermal stabilities of the cells and proteins of these species.

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