title: Testicular delta 5-3 beta-hydroxysteroid dehydrogenase in toad (Bufo melanostictus) following prolonged exposure to heat.
abstract: In contrast to our previous observation of increased activity of testicular delta5-3beta-hydroxysteroid dehydrogenase in toad with relation to the moderate rise of external temperature (40 degrees C), the present observation, however, shows a significant fall of this enzyme in the testis of toads exposed to a considerably high temperature (48 degrees C). The possible mechanism of action of heat on testicular steroid hormone synthesis has been discussed.
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000378:metabolism; D002025:Bufonidae; D006358:Hot Temperature; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D008297:Male; D013737:Testis / Q000201:enzymology*
chemical_list: D006913:Hydroxysteroid Dehydrogenases; D001205:Ascorbic Acid