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BIO 230 Microbiology IX
Bacterial Growth and Growth Requirements
50
Biology
Undergraduate 2
07/27/2009

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Term
Generation Time (GT)
Definition
Time required for a population to double.
Term
20-30 minutes
Definition
Average GT for bacteria
Term
logarithmic or geometric growth
Definition
The kind of rapid growth bacteria undergo.
Term
lag period
Definition
Period of time between bacterial growth
Term
log period
Definition
period of logarithmic bacterial growth
Term
stationary period
Definition
Period of bacterial growth when the number of bacteria being produced and dying are equal.
Term
Decline/death period
Definition
Period of bacterial growth curve when bacteria are rapidly declining in numbers.
Term

running out of nutrients

production of toxic wastes

Definition
two conditions that lead to the stationary period of bacterial growth curve
Term
acute infection
Definition
Infection caused by a bacteria that has a short generation time
Term
chronic infection
Definition
Infection caused by a bacteria that has a long generation time.
Term
~30 minutes
Definition
Duration of the lag period of bacterial growth.
Term
~12-24 hours
Definition
Duration of the log period of bacterial growth.
Term
~24-48 hrs
Definition
Duration of the stationary period of bacterial growth.
Term
~48-96 hrs
Definition
Duration of the decline/death period of the bacterial growth curve.
Term

Temperature

Oxygen

pH

Food (nutrients)

Enzymes

Definition
5 Important Bacterial Growth Requirements
Term
psychrophiles
Definition
cold-loving bacteria
Term

Low          High          Optimum

  -5              20                10-15

 

Definition
Low, High and Optimum temperature requirements for psychrophiles (in Celcius)
Term
mesophiles
Definition
moderate temperature loving bacteria
Term

Low          High          Optimum

 20              45                   37

Definition
Low, high, and optimum temperature requirements for mesophiles (in Celcius)
Term
thermophiles
Definition
heat loving bacteria
Term

Low          High          Optimum

  35             90                    55

Definition
Low, high and optimum temperature for thermophiles (in Celcius)
Term
obligate aerobe
Definition
need O2 to survive
Term
obligate anaerobe
Definition
O2 will kill these organisms
Term
facultative
Definition
can live with or without O2
Term
facultative anaerobe
Definition
can live with or without O2, but prefer environments with O2
Term
facultative aerobe
Definition
can live with or without O2, but prefer environments without O2
Term
pH
Definition
Measures the level of acid or base in a chemical.
Term
7.35 - 7.45
Definition
ph of blood
Term
5-6
Definition
pH of adult skin
Term
7
Definition
pH of children's skin
Term
6.8 - 7.2
Definition
Most bacteria prefer to live at a pH of ____________.
Term
energy
Definition
ability to do work
Term
phototrophs
Definition
gain energy from light sources
Term
chemotrophs
Definition
gain food/energy from chemicals
Term
chemoautotrophs
Definition
chemotrophs that need very simple nutrients and can make the rest themselves
Term
chemoheterotrophs
Definition
need more complex nutrients, such as lipids, proteins, and sugar
Term
fastidious chemoheterotrophs
Definition
need very complex nutrients found in blood or whole tissue
Term
chemoheterotrophs and fastidious chemoheterotrophs
Definition
types of bacteria that affect humans based on where they get their source of energy
Term
obligate parasites
Definition
organisms that use living matter as food
Term
obligate saprophytes
Definition
organisms that used non-living matter as a source of nutrients
Term
facultative
Definition
can use either living or non-living matter as food source
Term
catalyst
Definition
enzyme that speeds up a cell's chemical reactions
Term
  1.  
    1. unchanged in chemical reaction
    2. can be used over and over
    3. made of protein
    4. most end with -ase
    5. are specific
Definition
5 Characteristics of enzymes
Term
exoenzymes
Definition
enzymes that work outside the cell
Term
endoenzymes
Definition
enzymes that work inside the cell
Term
adaptive enzymes
Definition
enzymes that are made when they are needed
Term
constitutive enzymes
Definition
enzymes that are always present
Term
co-enzymes
Definition
some enzymes need these vitamins as helpers
Term
catabolism
Definition
metabolic process that breaks down substrate into products
Term
anabolism
Definition
metabolic process that builds cell parts
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