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Introduction of Yersinia Selective Agar Yersinia Selective Agar is recommended for the selective isolation and enumeration of Yersinia enterocolitica from clinical specimens (feces) as well as non-clinical sample like food samples, feces, etc. Image source:https://www.fishersci.com/ Principle of Yersinia Selective Agar The mannitol of the medium helps to differentiate between mannitol fermenting and non-fermenting bacteria. Microbes that ferment the sugar mannitol acidify the medium. It causes a localized drop in pH around the colonies.  The colonies take...

Introduction of Pseudomonas agar Pseudomonas agar is clear from its name and thus it is recommended selective isolation of Pseudomonas species. Principle of Pseudomonas agar The incorporation of tryptone and gelatin peptone provides nitrogenous and carbonaceous compounds, long chain amino acids, and other essential growth nutrients for the organisms. Magnesium chloride and potassium sulphate of medium enhance pigment production. Cetrimide and Sodium nalidixate used as a supplement makes  the medium specific for isolation of Pseudomonas from clinical specimens....

Introduction of SS Agar SS Agar is the short form of Salmonella-Shigella Agar and it is recommended for use as a selective and differential medium for the isolation of Salmonella and some Shigella species from clinical and non-clinical specimens (suspected foodstuffs). Composition of SS Agar  (Himedia) Ingredients    Gms / Litre Proteose peptone 5.0 Lactose 10.0 Bile salts mixture 8.5 Sodium citrate 8.5 Sodium thiosulphate 8.5 Ferric citrate 1.0 Brilliant green 0.00033 Neutral red 0.025 Agar 13.5...