[Variations of the glucose 6 phosphodehydrogenase activity at the level of the diencephalon and of the gonads of the dormouse (Glis glis L.) during the annual cycle].

Activity levels of G6-PDH in the diencephalon and testes of Glis glis during the annual cycle show comparable variations. In the autumn, this activity is low and the gonads are inactive. At the anset of hibernation, this activity increases and becomes maximal during the period preceeding awakening. At mid-hibernation, the seminiferous tubules display in important enzymatic activity. Awakening is marked by a fall in enzymatic activity level that is a little more precosius of the diencephalon. The variations of enzymatic activity levels of G6-PDH in the diencephalon are similar in the female with an autumnal minimum and a maximal activity at the end of hibernation.