Genetic Characteristics of Streptomycin-resistant Streptococci
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چکیده
منابع مشابه
Transformability of streptomycin-resistant group H streptococci.
Several resistant mutants of a transformable group H streptococcus, strain Challis, were isolated from media containing high concentrations of streptomycin. Mutants SR5a and SR5 exhibited high and low transformability, respectively, when exposed to deoxyribonucleic acid (DNA) from a novobiocin-resistant Challis strain. With similar exposure, mutant SR30 exhibited loss of transformability. The m...
متن کاملAccumulation of 14C-streptomycin by streptomycin-sensitive and streptomycin-resistant group H streptococci.
Three streptomycin-resistant mutants of group H streptococcus, strain Challis, were examined for ability to accumulate (14)C-streptomycin. Although the mutants exhibited different levels of transformation, only the streptomycin-sensitive parent Challis strain accumulated significant amounts of (14)C-streptomycin. It appears that impermeability to streptomycin does not necessarily result in redu...
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Perry, Dennis (Northwestern University Medical School, Chicago, Ill.) and Hutton D. Slade. Transformation of streptococci to streptomycin resistance. J. Bacteriol. 83:443-449. 1962.-A total of 43 strains of streptococci, belonging to serological groups A, B, C, D, E, F, G, H, K, L, M, N, O, and Q, and three ungroupable strains were exposed to deoxyribonucleic acid (DNA) extracted from streptomy...
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The readiness with which many organisms develop resistance to streptomycin is well recognized; Willcox (1953) ventured to predict that "should streptomycin be widely used for gonorrhoea it is possible that its efficiency may decline". At the Liverpool Royal Infirmary during the past 4 years routine treatment of male patients suffering from gonorrhoea has been by a single injection of streptomyc...
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Several streptomycin-resistant mutants of Escherichia coli have been isolated which require exogenous isoleucine for growth. The majority of these strains were of streptomycin-dependent phenotype. If grown in the absence of streptomycin, these streptomycin-dependent auxotrophs (Sm(d-aux)) strains were unable to produce beta-galactosidase and aldolase activities and also failed to exhibit donor ...
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ژورنال
عنوان ژورنال: Journal of General Microbiology
سال: 1971
ISSN: 0022-1287
DOI: 10.1099/00221287-65-2-139