منابع مشابه
Purine-requiring and pyrimidine-requiring mutants of Saccharomyces cerevisiae.
Haploid strains of S. cerevisiae were exposed to ultraviolet irradiation, and mutants were isolated by a modified layer plate procedure (Lederberg and Tatum, 1946), using a complete agar as the recovery layer. Six mutants were found which required adenine, two which required uracil. A seventh adenineless mutant was obtained through the courtesy of S. E. Reaume (Reaume and Tatum, 1949). Genetic ...
متن کاملIsoleucine - Valine Requiring Mutants of Salmonella Typhimurium
E have isolated a number of mutant strains of Salmonella typhimurium that display a marked inhibition of growth when valine is added to minimal medium. Attempts to elucidate the nature of the mutation(s) in these valinesensitive strains have included enzymatic and transductional analyses, as well as growth studies, on four of these strains. The results of these studies are presented and discuss...
متن کاملIsoleucine-valine Requiring Mutants of Salmonella Typhimurium.
initial reports on the mutant strains of Salmonella typhimurium that T: eui r both isoleucine and valine for growth (ilva strains) were published concomitantly by GLANVILLE and DEMEREC ( 1960) and WAGNER and BERGQUIST (1960). These studies showed that although the available ilva strains could be divided into four complementation groups ( A , B , C and D ) on the basis of abortive transduction r...
متن کاملElective selection of proline-requiring mutants.
We recently discovered a method whereby proline-requiring (pro) mutants of some strains of Escherichia coli K-12 can be selected at high frequency (Table 1). The method seems to involve the general principle of differential growth rates. Only pro E. coli K-12 mutant strains grew in Penassay Broth (Difco) containing 1 to 3 ,ug/ml of 4-nitropyridine-N-oxide (4NPO), 10 ,ug/ml of 4-nitrosopyridine-...
متن کاملInositol-requiring mutants of Saccharomyces cerevisiae.
Fifty-two inositol-requiring mutants of Saccharomyces cerevisiae were isolated following mutagenesis with ethyl methanesulfonate. Complementation and tetrad analysis revealed ten major complementation classes, representing ten independently segregating loci (designated ino1 through ino10) which recombined freely with their respective centromeres. Members of any given complementation class segre...
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ژورنال
عنوان ژورنال: Fungal Genetics Reports
سال: 1979
ISSN: 1941-4765
DOI: 10.4148/1941-4765.1694