MBIO 3812 Ex 2-9, 2-10, 2-11 Temp, pH, NaCl

MBIO 3812 Ex 2-9, 2-10, 2-11 Temp, pH, NaCl - MBIO 3812 The...

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MBIO 3812 The Effect of Different Environmental Conditions on Microbial Growth Since bacteria are ubiquitous bacterial species can be found in many different habitats and therefore can survive and grow under many different kinds of environmental conditions The environmental conditions that a bacteria may encounter include: 1. Different temperatures 2. Different pH levels 3. Different osmotic pressures 11
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MBIO 3812 Ex 2-9 The Effect of Temperature on Microbial Growth Growth rate Temperature (°C) 10 20 30 40 50 minimum optimal maximum all bacteria have a limited temperature range at which they can grow CARDINAL temperatures = minimal, optimal & maximal temperatures at which a bacterium can GROW Example: minimal growth temp. = ~14°C optimal growth temp. = ~32°C maximum growth temp. = ~44°C 22
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33 MBIO 3812 Ex 2-9 The Effect of Temperature on Microbial Growth based on their cardinal temperatures bacteria can be placed in different thermal categories normal body temperature 37°C or 98.6°C
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44 MBIO 3812 Ex 2-9 The Effect of Temperature on Microbial Growth PSYCHROPHILES can ONLY grow at temperatures less than 20°C typical range -5°C to 20°C (32-68°F) PSYCHROTROPHS typical range for growth 0°C to 30°C (23-86°F) temperature
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55 MBIO 3812 Ex 2-9 The Effect of Temperature on Microbial Growth PSYCHROPHILES 80% of all bacteria can grow at ≤ 10°C psychrophilic bacteria can be found in alpine soils, icefields and oceans (marine water < 5°C) psychrophiles are NOT human pathogens Obtaining an ice core sample
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66 MBIO 3812 Ex 2-9 The Effect of Temperature on Microbial Growth PSYCHROTROPHS psychrotrophic bacteria can be found in soils, surface water and in foods psychrotrophs can be human pathogens
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77 MBIO 3812
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MBIO 3812 Ex 2-9, 2-10, 2-11 Temp, pH, NaCl - MBIO 3812 The...

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