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STAPHYLOCOCCUS AGAR Nº 110 500 grams/bottle

SKU
CDL/1032
Brand
CONDALAB
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Staphylococcus Agar Nº 110 is a selective medium used to isolate pathogenic staphylococci from clinical and non-clinical samples based on mannitol fermentation, pigment formation and gelatinase activity. Staphylococci are responsible for many cases of pneumonia, meningitis, furunculosis, urethritis, vaginitis, etc. This medium is also used for isolating staphylococci which contaminate a wide variety of foods and produce food poisoning. Casein peptone provides nitrogen, vitamins, minerals and amino acids essential for growth. Yeast extract is a source of vitamins, particularly the B-group. Lactose and D-mannitol are the fermentable carbohydrates as energy sources; Dipotassium phosphate is the buffer; Sodium chloride supplies essential electrolytes for transport and osmotic balance and, in high concentration, inhibits most bacteria except staphylococci. Gelatin is included to test liquefaction. Bacteriological agar is the solidifying agent. Pathogenic staphylococci (coagulase-positive staphylococci) resist the high NaCl concentration and form golden yellow colonial pigments. Mannitol fermentation, producing acid, is detected by adding a few drops of Bromothymol blue to a plate and looking for a yellow halo around the colonies. Staphylococci liquefy gelatin, producing clearing zones around the colonies. One plate can be filled with 5 ml of a saturated solution of ammonium sulfate, or with a drop of 20% sulfosalicylic acid and incubated for 12 minutes to observe the hydrolysis of the gelatin: a clearing around the colony constitutes a positive hydrolysis (Stones Reaction).
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Brand CONDALAB
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