共查询到20条相似文献,搜索用时 15 毫秒
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Holloway BW 《Genetics》1955,40(1):117-129
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Heterocaryosis in Neurospora Crassa 总被引:11,自引:0,他引:11
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Robert Twarog 《Journal of bacteriology》1972,111(1):37-46
Regulation of four of the enzymes required for isoleucine and valine biosynthesis in Acinetobacter was studied. A three- to fourfold derepression of acetohydroxyacid synthetase was routinely observed in two different wild-type strains when grown in minimal medium relative to cells grown in minimal medium supplemented with leucine, valine, and isoleucine. A similar degree of synthetase derepression was observed in appropriately grown isoleucine or leucine auxotrophs. No significant derepression of threonine deaminase or transaminase B occurred in either wild-type or mutant cells grown under a variety of conditions. Three amino acid analogues were tested with wild-type cells; except for a two- to threefold derepression of dihydroxyacid dehydrase when high concentrations of aminobutyric acid were added to the medium, essentially the same results were obtained. Experiments showed that threonine deaminase is subject to feedback inhibition by isoleucine and that valine reverses this inhibition. Cooperative effects in threonine deaminase were demonstrated with crude extracts. The data indicate that the synthesis of isoleucine and valine in Acinetobacter is regulated by repression control of acetohydroxyacid synthetase and feedback inhibition of threonine deaminase and acetohydroxyacid synthetase. 相似文献
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Abstract A method for preparing ribosomes from Neurospora crassa is described in which che ribosomes prepared are free from the enzymes cytochrome c oxidase and NADPH-cytochrome c reductase, DNA and phospholipid material. 相似文献
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Modification of Ultraviolet-Induced Mutation Frequency in Neurospora Crassa 总被引:1,自引:0,他引:1 下载免费PDF全文
Tiiu Vaharu 《Genetics》1961,46(3):247-256
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M. Bojko 《Genetics》1990,124(3):593-598
Heterozygotes for three long inversions on chromosome 1 were analyzed by serial reconstruction from electron micrographs. Measurements of loop lengths at different meiotic prophase substages revealed that the homologous synapsis of the inverted region was gradually replaced by nonhomologous synapsis as loops were eliminated during pachytene. This synaptic adjustment was apparently not affected by crossovers which occurred within the 150- and 160-cM long loops. 相似文献
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Genetic Studies of Ad-8 Mutants in Neurospora Crassa. I. Genetic Fine Structure of the Ad-8 Locus 总被引:8,自引:3,他引:5 下载免费PDF全文
Tatsuo Ishikawa 《Genetics》1962,47(9):1147-1161