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In the ovotestis of Helix pomatia both oogenesis and spermatogenesis were influenced by treatments with steroid hormones produced in the gonads of higher vertebrates. Testosterone influenced gametogenesis to a small degree. Progesterone and oestrone-acetate at first stimulated ovogenesis, but they also acted on spermatogenesis. All three hormones examined… (More)
Gametogenesis of the snail was shown to be affected by cortisol, deoxycorticosterone and 19-nortestosterone. An activation of the ovogenetic apparatus while uncertain responses of spermiogenesis were observed. On the basis of effects of non-gonadospecific steroids it is concluded that the receptors of the snail's spermiocytes are not selective. The… (More)
As object-oriented programming becomes a mainstream technology, instructors are wrestling with how to incorporate it into the Computer Science curriculum. In what ways does teaching object-oriented techniques differ from teaching procedural programming? What are the barriers for both professors and students encountering object-oriented programming for the… (More)
On the effect of ovotestis (glandula hermaphroditica) homogenate the number of ovocytes of 1st and 2nd order and of the eggs increased very significantly, while spermiocytes of 1st order sperms significantly decreased in number. When snails with extirpated tentacles were injected with ovotestis homogenate the ovogenesis was activated which was proved by a… (More)
Gonadotropic hormone (FSH) stimulated markedly spermatogenesis in the ovotestis of snails. This is indicative of the presence of receptors sensitive to gonadotropic hormone in snail spermatogonia. FSH had no influence on oogenesis.