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Academic Press acetic acid activity aerobic agar agents amino acids anaerobic animal antibacterial antibiotics antigen antimicrobial appear autotrophic bacillus Bact bacteria bacterial cell bacterium capsule carbon cell wall cent Chap chemical coenzyme coli colonies compounds containing COOH cycle differential dilution disease disinfection effect electron energy enzyme example factors fermentation flagella folic acid formation genetic glucose glutamic glutamic acid gram-negative growth HCOH hemolysins host cell hydrogen incubation infection influenza inhibition inoculation lactic lysogenic mechanisms medium membrane metabolism micro microbial Microbiol Microbiology microorganisms molecule morphological nitrogen nucleic acid nucleotide occur organisms oxidation pathogenic pathway penicillin phage phosphate physiological presence produced protein protoplasm purine pyruvic acid reaction relatively resistance rickettsiae serum specific spore stain sterile structure studies substances substrate sulfonamides Symposium synthesis temperature teria tion titration tive toxic toxin tubes ture variation viral virulence virus virus particles viruses