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antimicrobials acid. water classification infection action ehrlich paul antimicrobial history drug pollution resistance chemical alcohols chemotherapy infectious diseases of the ears mechanisms plants arsenicals as therapeutic agents compounds ammonium quartarnary surgery medicinal important properties arsenic atoxyl arsanilic use antiseptics agent oxidizing mode aldehides phenols non medicial sanitizer disinfectants. biological organic metals toxic pollutions inorganic pollutants metronidazoles imidazoles ciprofloxacin nalidixic antibacterials 4-quinolone nitrofurans antitubercular sulfonamides environment microorganisms microbiology cancer mustard gas war world i domagk fleming arises due problems organisms types wounds disease infectious diseases physical evolution microbial biodiversity biological evolution origin of life on earth chemical evolution biodiversity archae biodiversity bacterial biodiveristy protozoa biodiversity fungal biodiversity origin of life (r.a.s) return lagoons aerated waste water microbiology water borne diseases fresh water water microbiology fresh water microbiology infectious diseases of the eyes mycology fungi infectious diseases of respiratory tract gastrointestinal tract urinary tract std sexual transmitted diseases cns central nervous system eyes and mouth mycoses infectious diseases of the skin and wound skin skin disorders ponds quality measurement analysis measurements quantitative hypochlorite chloride sodium (carbolic phenol dihydrochloride octenidine iodine peroxide hydrogen gluconate chlorhexidine boric stabilization facultative contactor rotating (biotower) biofilter filter trickling ditch oxidation sludge activated process aerobic waste bacteriological examination physical quats