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Micro 3

Terms in this set (172)

What is microbial growth?
increase in number of cells
What are the two general of requirements for microbial growth?
Physical (temp, pH, osmotic pressure)
Chemical (nutrients, growth factors)
A bacterium has just encountered a new environment. What are its three basic choices with respect to growth in this new environment?
Adapt, tolerate or die
What are a bacterium's cardinal temperatures? Do all bacteria have the same cardinal temperatures?
The min, optimal and max growth temps of a microbe
psychrophiles
extreme cold loving microbes
psychrotrophs
cold loving
good spoilage microbe
mesophiles
moderate/middle temp loving bacteria
thermophiles
heat loving microbes
hyperthermophiles
extreme heat
What category do most human pathogens fall into for temp?
mesophiles
neutrophiles
neutral pH
acidophiles
like acidic environment
ex: Helicobacter pylori
alkaliphiles
like basic environment
ex: Natronobacterium
What category do most human pathogens fall into for pH?
neutrophiles
With respect to osmotic pressure, what type of environment will most bacteria encounter and what happens under this condition?
Most want Isotonic or hypotonic
the cell expands
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