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- W2425239482 abstract "Effects of yeast, propionic acid and ethanol on the activity of H-factor, which sharply increases the frequency of somatic recombination in X-chromosomes of dorsal prothoracal disc cells in Drosophila simulans are studied. The frequency of yellow and singed mosaic spots in heterozygous yw ++/++sn1vHD. melanogaster females, inherited H-factor from the father (the stock sn1v) is estimated. The results of the varience analysis have shown that yeast and propionic acid regulate the activity of H-factor in cells of dorsal prothoracal disc, the interaction of yeast and propionic acid being also observed. Yeasts (or some unknown product of their metabolism) are the activator of H-factor; thus, when larvae eat much yeast, the frequency of yellow and singed mosaic spots in humeral region becomes high. A decrease of mosaic spot frequency under the increase of propionic acid content in nutrition medium is a result of the inhibitory effect of propionic acid on the yeast growth, but not of the direct repression of H-factor activity. So, propionic acid may be considered as a regulator of the second order. Ethanol does not activate H-factor. Changes in the content of yeast and propionic acid in nutrition medium do not affect the frequency of yellow and singed mosaic spots in other regions of D. simulans body, except humeral." @default.
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- W2425239482 date "1977-01-01" @default.
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- W2425239482 title "[Role of propionic acid, yeasts and ethyl alcohol in regulating the activity of H-factor in Drosophila simulans]." @default.
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