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Life Cycle of Round worm (Ascaris lumbricoides)
Roundworm passes its life cycle in single host and no intermediate host (the host that harbors larval stage of parasite) is required. Man is the only definitive host (the host…
Optochin Sensitivity Test: Principle, Procedure and Interpretation
Principle: Optochin (ethyl hydrocupreine hydrochloride) sensitivity test is used for the presumptive identification of alpha-hemolytic streptococci as Streptococcus pneumoniae. Optochin is used to differentiate Streptococcus pneumoniae from other alpha-hemolytic streptococci.…
Infections caused by anaerobes and features of anaerobic infections
Infections caused by anaerobic bacteria occur in all parts of body. These infected tissues usually contain a mixture of several kinds of anaerobes and frequently also contain aerobic and facultative…
Anaerobes: Why can’t anaerobic organism survive in presence of oxygen?
Anaerobes or anaerobic organisms are those that cannot grow in presence of oxygen. Oxygen is toxic for them so they must rely on other substances as terminal electron acceptor. Their…
Urea hydrolysis/ Urease test (Christensen’s method)
Urea hydrolysis/Urease test is used to detect the ability of an organism to produce urease that hydrolyses urea contained in the medium. Hydrolysis of urea produces ammonia and carbon dioxide The…
Bacteriological culture media / Types of culture media
Bacteria have to be grown for their identification and investigating other properties like antimicrobial susceptibility, test for enzyme production or test for virulent genes etc. By the use of appropriate…