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 Introduction  of  Dienes Phenomenon  Dienes phenomenon from the name of Dienes (1946) who first observed and explained about this.  It is also called Dienes typing. Although the phenomenon has never been satisfactorily explained. It is used successfully to determine the relationship between strains of Proteus species in studies of cross-infection. Principle of Dienes Phenomenon When two different strains of Proteus species inoculate at different places of the same non-inhibitory medium (blood agar), the swarming of the two strains remains separated by...

Introduction of Chromogenic UTI Medium A chromogenic UTI Medium is applicable for the presumptive identification and differentiation of all the main micro-organisms that cause urinary tract infections (UTIs). Principle of Chromogenic UTI Medium Chromogenic UTI Medium is a differential agar that provides presumptive identification of the principal pathogens that cause infection of the urinary tract.  Peptone is a complex mixture of partially digested proteins. It contains proteoses, amino acids, polypeptides, phosphates, minerals (K, Mg), and accessory growth...

Introduction of Urea Test / Urea hydrolization Test / Urease Test Urea Test or Urea hydrolyzation Test or Urease Test are other names of the same test. The urease test is important for certain bacteria and fungi that possess this enzyme that hydrolyzes urea releasing ammonia into the medium. This produces a change in the pH of the medium that can be detected by the color change in the indicator dye. This test can be used to...