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Terms in this set (33)
What effects does the environment have on the growth?
Maximize microbial growth
Inhibit or delay the growth
3. Osmotic pressure
Microbial species requires temperature
In regards to temperature, each microbe requires
a specific growth temp.
Temperature growth range is determined by
the heat sensitivity of it's make up.
Enzymes, Membranes and Ribosomes
If these can not function then the cell will die
lowest temperature at which growth can occur
Highest temperature at which growth can occur
Temperature at which rate of cellular reproduction is most rapid (temp of the normal habitat)
Grow well at 0 degree Celsius
Optimum: 15 degrees or lower
Grow at 0 -7 degrees Celsius
Grow between 25-45 degrees
Celsuis. Majority of typical lab bacteria found in this class
grow at 55 degrees or higher.
grow at 90 degrees or above.
bacteria that can survive boiling even though they cannot grow.
* Usually they are spore forming.
dramatically affects prokaryotic growth by affecting activity of enzymes.
*Especially those that are involved in biosynthesis.
Microbe species possess
- Definite pH growth range
-Distinct pH growth optimum
Most bacteria are
neutrophiles- they produce metabolic acids
produce a pH equlibrium and neutralize acids produced by bacteria
Examples of buffers
Peptones, Phosphate salts
Bacteria tolerance to different salt concentration
Osmotic Pressure is the
force developed when two solutions of different solute concentration are separated by a membrane that is permeable only to the solvent
is simply the diffusion of water
the movement of small substances from a higher to lower concentration.
the concentration of the solute is the same inside and outside the bacterium
( low solute, high water content), water will enter the cell and cause it to burst.
(high solute, lower water content), water leaves and the plasma membrane shrinks away from the wall--- plasmolysis
bacteria that can tolerate high salt (NaCl) concentrations (Hals means salt)
live in the sea
tolerate higher salt concentration (live in salty environments)
Sets with similar terms
Microbial Growth Chapter 6 Micro
Microbiology Ch. 6 Microbial Growth
Micro 107 - Quiz 3
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