The variation of 3β-hydroxysteroid dehydrogenase activity of the ovaries and pyloric caeca of the starfishAsterias rubens during the annual reproductive cycle
作者： H. J. N. Schoenmakers
DOI: 10.1007/BF00688731
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摘要: 1. The activity of the enzyme 3β-Hydroxysteroid dehydrogenase (3β-HSD) in ovaries and pyloric caeca ofAsterias rubens during annual reproductive cycle has been investigated vitro, using pregnenolone as substrate. The was expressed percentage conversion into progesterone. 2. 3β-HSD is hardly active both tissues resting stage (stage 1) cycle. At end 1 3β-HSD increases a maximum reached early growth 2). During late partial maturation 3) declines progressively to low level, this maintained 4). 3. A positive correlation found between activities caeca. 4. Some morphological histolotical changes appear coincide with variations activity. 5. The significance these results will be discussed.
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