Bio 260 CH6 A
Microbial Growth: -an increase in population size
-refers to an increase in #, not size
binary fission
Colonies: start as one cell divide to form colony
Robert Koch (1876): nobel prize
-developed methods of cultivating bacteria
-Solid medium attempts -tried gelatin, melted easily, and got eaten
-Fannie Hess 1882, wife of a colleague, suggests using agar 1
prokaryotes found growing in severe conditions: Ocean depths ,volcanic vents polar regions all harbo
thriving pro species
many scientist believe that if life exists on other planets it may resemble these microbes
Individual species have limited set of conditions: Also require appropriate nutrients
Important to grow microbes in culture: Medical significance
nutritional, industrial uses
What conditions do microbes need to grow: -Temperature
-pH
-Water/osmotic pressure/how much stuff is dissolved in that water, which they move
-oxygen/detox
1/5
, -nutrients
how do we control growths:
Psychrophiles: cold-loving microbes -5-15c
loosen membrane
unsaturate Fatty acids
Psychrotrophs: Grow between 0°C and 20-30°C Cold living up to human temp, just barely
food spoilage
-unsaturated fatty acids to service
Mesophiles: moderate temperature-loving microbes/body temp 37 c 25-45c pathogens 35-40 c
overlap with psychrotrophs
2/5
Microbial Growth: -an increase in population size
-refers to an increase in #, not size
binary fission
Colonies: start as one cell divide to form colony
Robert Koch (1876): nobel prize
-developed methods of cultivating bacteria
-Solid medium attempts -tried gelatin, melted easily, and got eaten
-Fannie Hess 1882, wife of a colleague, suggests using agar 1
prokaryotes found growing in severe conditions: Ocean depths ,volcanic vents polar regions all harbo
thriving pro species
many scientist believe that if life exists on other planets it may resemble these microbes
Individual species have limited set of conditions: Also require appropriate nutrients
Important to grow microbes in culture: Medical significance
nutritional, industrial uses
What conditions do microbes need to grow: -Temperature
-pH
-Water/osmotic pressure/how much stuff is dissolved in that water, which they move
-oxygen/detox
1/5
, -nutrients
how do we control growths:
Psychrophiles: cold-loving microbes -5-15c
loosen membrane
unsaturate Fatty acids
Psychrotrophs: Grow between 0°C and 20-30°C Cold living up to human temp, just barely
food spoilage
-unsaturated fatty acids to service
Mesophiles: moderate temperature-loving microbes/body temp 37 c 25-45c pathogens 35-40 c
overlap with psychrotrophs
2/5
