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 0°C and 20-30°C • 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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This note was uploaded on 01/16/2012 for the course BIOLOGY 251 taught by Professor Lancebowen during the Fall '10 term at Truckee Meadows Community College.

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bacterial growth - Chapter 6 Microbial Growth Microbial...

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