| Description | Crossley Milk Medium |
|---|---|
| Quantity | 500 g |
| Yield | For 4.5L medium |
| Form | Powder |
| Product Type | Dehydrated Culture Media |
| Unit Size | Each |
Answer:Monitoring bacterial reactions in a milk-based broth, including acidity, clotting, gas and casein digestion.
Answer:110 g in 1 L of distilled water, followed by the specified preparation and sterilization procedure.
Answer:500 g of dehydrated medium, sufficient for approximately 4.5 L when prepared at 110 g/L.
Thermo Scientific Oxoid Crossley Milk Medium is a dehydrated differential liquid culture medium used to observe microbial biochemical reactions in milk-based substrates. Its formulation combines skimmed milk powder, peptone and bromocresol purple, allowing bacterial growth and changes in acidity, clot formation, gas production or casein digestion to be assessed. The medium is useful in investigations of anaerobic and other bacteria associated with food microbiology, including the examination of canned-food samples. Prepare the powder at 110 g per litre of distilled water, distribute into suitable tubes and sterilize at 121°C for five minutes using the established medium preparation procedure. Observe reactions alongside appropriate culture controls and incubation conditions rather than interpreting a single color change in isolation. A purple-to-yellow shift indicates increased acidity, while proteolysis may change the appearance of the milk suspension. This is a dehydrated culture medium, not liquid milk, egg-yolk enrichment or a selective agar formulation.
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