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Gonadal differentiation and secretions of estradiol and testosterone of the ovaries of Rana catesbeiana tadpoles treated with 4-hydroxyandrostenedione.
TLDR
Results indicated that activity of aromatase in the ovary was inhibited by 4-OHA, resulting in accumulation of T which induced transformation of the ovaries into testes.
Intergenic complementation of glucoamylase and citric acid production in two species of Aspergillus.
TLDR
It is concluded that gene dosage (or ploidy) does not increase the yield of citric acid and the apparent enhancement in yields observed in diploids or heterokaryons synthesized between auxotrophs with reduced yields in both species can be interpreted as resulting from intergenic complementation.
Penicillin production by glucose-derepressed mutants ofPenicillium chrysogenum
TLDR
The results suggest that isolation of GRI mutants is an effective way to select for higher producing strains and that the synthesis of penicillin synthesizing enzymes in GRI mutant mutants may be less repressed by glucose than in wild-type strains.
Induced mutation in UV-sensitive mutants of Aspergillus nidulans and Neurospora crassa.
TLDR
It is suggested that reported effects of mutations conferring UV sensitivity on induced mitotic recombination may reflect altered mutability.
Non-nuclear inheritance of UV sensitivity in Neurospora crassa.
TLDR
A model is presented to explain the results from a cross and the heterocaryon test in which the determinants defined by the uvs-2 mutation are postulated as being bound to the nuclear membrane.
Stimulation of the conversion of penicillin N to cephalosporin by ascorbic acid, alpha-ketoglutarate, and ferrous ions in cell-free extracts of strains of Cephalosporium acremonium.
TLDR
It is shown that the activity was lost upon boiling, indicating the reaction is enzymatic in nature, and the production of the cephalosporin-like material was stimulated by the addition of ascorbic acid and ferrous ions, components which are co-factors in monooxygenase and dioxygenase reactions.
In vitro estradiol synthesis and secretion by tadpole ovaries of different developmental stages.
TLDR
The results indicate that the tadpoles synthesize and release E2 as early as stage X, that E2 increases slowly and gradually through stage XXV, and that E1 increases rapidly in juvenile frogs.
Gonadal transformation in male Rana catesbeiana tadpoles intraperitoneally implanted with estradiol capsules.
TLDR
Results indicate that a low dose of exogenous E2 may induce transformation of the testes into ovaries in tadpoles of Rana catesbeiana.
Positively charged filters for virus recovery from wastewater treatment plant effluents
TLDR
Positively charged Zeta Plus filters were used to concentrate enteroviruses from 19 liters of effluent from activated sludge units and approximately 50% of the viruses added to effluents could be recovered in the final sample.
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