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THE CYTOLOGICAL BASIS OF BACTERIAL GENETICS
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acid adaptive enzyme addition agar alanine antibiotic antigenic antigenic characteristics auxotrophic mutants Bact bacterial genetics bacterial populations bacterium Biol biosynthetic Braun broth Brucella abortus capsular cause changes in colonial chromosomes clones Cold Spring Harbor coli colonial morphology colonial types containing cultures cytoplasmic factors detected diploid effects environment environmental conditions enzyme example exposure favor fermentation gametes genes genic genotype Goodlow growth rate hereditary higher organisms increase incubation indicated inhibition inhibitory initially inoculated involving irradiation isolated Lederberg metabolic metabolite mutagenic mutant cells mutation rates non-smooth nuclear nuclei number of cells observed obtained occur original parent cells parent strain parent type penicillin phage phage-resistant phenotype plating Pneumococcus polysaccharide population changes presence progeny proportion prototrophic reactions recombination replica plating result Salmonella Salmonella typhimurium selective value similar solid media specific Spring Harbor Symp streptomycin studies substrate threonine tion transformation tryptophan typhimurium variants viable cell virulence vivo