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Types of flagellar arrangement in bacteria

While reading bacterial structures, you might have known that flagella are the organ of locomotion in bacteria. If bacteria do not possess flagella then they are non motile. For example, Klebsiella spp Shigella spp do not possess flagella hence they are nonmotile while those psoosessing flagella are Bacteria (especially gram negative bacilli) possess flagella with […]

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.  Streptococcus pneumoniae strains are sensitive to Optochin although some strains are optochin-resistant and other alpha-hemolytic streptococcal species are Optochin-resistant. The Optochin test is performed on […]

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 method of isolation in culture medium, they can be obtained in pure cultures for further study. Numerous and diverse type of culture medium are available […]