Transcription of Microbial Growth: cell number Chapter 6: Microbial Growth
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Microbial Growth: cell number Chapter 6: Microbial Growth
1 Chapter 6: Microbial GrowthMicrobial Growth :4 Refers to an increase in cellnumber, not in cell grow and divide by binaryfission, a rapid and relatively simple for GrowthPhysical : Microbes are looselyclassified into several groups based on their preferred temperature : Cold-loving . Can grow at 0oC. Two groups:uTrue Psychrophiles: Sensitive to temperatures over 20oC. Optimum Growth at 15oC or below. Found in very cold environments (North pole, ocean depths). Seldom cause disease or food : Optimum Growth at 20 to 30oC. Responsible for most low temperature food for GrowthPhysical : Middle loving . Most most pathogens and common spoilage Growth between 25 to 40oC. uOptimum temperature commonly have adapted to live in the bodies of for GrowthPhysical : Heat loving .uOptimum Growth between 50 to 60oC. uMany cannot grow below to live in sunlit soil, compost piles, and hot springs. uSome thermophilesform extremely heat resistant (Hyperthermophiles):Optimum Growth at 80oC or higher.
4 MacConkey Agar: Used to distinguish and select for Salmonella. • Bile salts and crystal violet discourage growth of gram - positive bacteria. • Lactose plus pH indicator: Lactose fermenters produce pink or red colonies, nonfermenters are colorless. Microbial Growth Culture Media Enrichment Culture : Used to favor the growth of a
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