Bacterial Genetics |
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acid adaptation adaptive enzyme alanine antibiotic antigenic antigenic characteristics auxotrophic mutants Bact bacteria bacterial genetics bacterial populations bacterium Biol biosynthetic Braun Brucella capsular cell division changes in colonial chromosomes clones Cold Spring Harbor coli colonial morphology concentration containing cultures cytoplasmic factors Demerec demonstrated detected developed diploid environment environmental conditions enzymatic enzyme establishment example exposure fermentation fluctuation test gametes genes genic genotype hereditary higher organisms increase incubation indicated inhibitory initial inoculated involving isolated Lederberg metabolic metabolite muta mutagenic mutagenic agents mutant cells mutants resistant mutation rates mutational changes nuclear nuclei number of mutants nutrient observed obtained occur parent cells parent strain parent type penicillin phage phage-resistant phenotype population changes present production progeny proportion prototrophic reactions recombination replica plating resistant mutants Salmonella typhimurium sensitive similar smooth specific spontaneous mutation Spring Harbor Symp streptomycin streptomycin-resistant studies substrate threonine tion transformation tryptophan variants viable virulence vivo