bacterial growth - Chapter 6 Microbial Growth Microbial...

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Unformatted text preview: Chapter 6 Microbial Growth Microbial Growth Microbial growth = increase in number of cells, not cell size Temperature Minimum growth temperature Optimum growth temperature Maximum growth temperature The Requirements for Growth: Physical Requirements Temperature Figure 6.1 Grow between 0C and 20-30C Cause food spoilage Psychrotrophs Psychrotrophs Figure 6.2 pH Most bacteria grow between pH 6.5 and 7.5 Molds and yeasts grow between pH 5 and 6 Acidophiles grow in acidic environments The Requirements for Growth: Physical Requirements The Requirements for Growth: Physical Requirements Osmotic Pressure Hypertonic environments, increase salt or sugar, cause plasmolysis Extreme or obligate halophiles require high osmotic pressure Facultative halophiles tolerate high osmotic pressure The Requirements for Growth: Physical Requirements Figure 6.4 Carbon Structural organic molecules, energy source Chemoheterotrophs use organic carbon sources Autotrophs use CO 2 The Requirements for Growth: Chemical Requirements Nitrogen In amino acids, proteins Most bacteria decompose proteins Some bacteria use NH 4 + or NO 3- A few bacteria use N 2 in nitrogen fixation Sulfur...
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bacterial growth - Chapter 6 Microbial Growth Microbial...

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