Transcription of Microbial Growth: cell number Chapter 6: Microbial …
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Microbial Growth: cell number Chapter 6: Microbial …
Microbial growth : 4 Refers to an increase in cell number , not in cell size. Chapter 6: Microbial growth 4 Bacteria grow and divide by binary fission, a rapid and relatively simple process. Requirements for growth Requirements for growth Physical Requirements Physical Requirements 1. Temperature: Microbes are loosely 1. Temperature: classified into several groups based on their B. Mesophiles: Middle loving . Most bacteria. preferred temperature ranges. u Include most pathogens and common spoilage A. Psychrophiles: Cold-loving . Can grow at organisms. 0 o C. Two groups: u Best growth between 25 to 40 oC. u Optimum temperature commonly 37oC. u True Psychrophiles: Sensitive to temperatures over 20 oC. Optimum growth at 15oC or below. Found in u Many have adapted to live in the bodies of animals. very cold environments (North pole, ocean depths).
1 Chapter 6: Microbial Growth Microbial Growth: 4Refers to an increase in cell number, not in cell size. 4Bacteria grow and divide by …
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