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micro fundamentals
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Mesophiles
Most bacteria fall in this range
All human pathogens
Aerobes (Aerobic)
need plentiful oxygen
Anaerobes (Anaerobic)
need an oxygen-free environment.
Poisoned by oxygen
Microaerophiles(Microaerophilic)
Require low oxygen concentration
Canophiles (Canophilic)
Require love oxygen and increased carbon dioxide
Autotrophs
synthesize own food from simple inorganic carbon sources (ie: carbon dioxide)
Heterotrophs
must obtain pre-formed organic molecules from environment
Saprobes (saprophytes)
feed exclusively on dead organic matter
Parasites
feed on living organic matter
Pathogen
parasite that causes disease in host organism
Nutrient Broth
water, beef extract, and peptone
Nutrient Agar
solid medium
consists of nutrient broth and agar
Enriched Media
used for preliminary isolation that favors the growth of a particular microorganism
Selective Media
Ingredients inhibit certain bacteria and encourage others
Differential Media
ingredients allow colonies of different microorganisms to be more easily distinguished from each other
(strep throat now quickly identified)
Bacteria Growth phases
lag phase – initialexposure
exponential growth phases– aka log phase (symptoms start to appear)
stationary phase –bacteria are starting to run out of nutrients/resources so there are equal numbers of bacteria replication and death
death – aka logarithmicdecline phase (this is where we start seeing endospore formation)
streak plate method
streak bacteria across solid medium
pour plate method
bacterial sample diluted in several tubes of agar medium
agar poured into Petri dishes
bacteria form discrete colonies where diluted the most
used to estimate the number of original organisms present
Symbiosis
two populations of organisms interact in a close and permanent association
Mutualism
interation benefits both organisms
Commensalism
one organism derives benefit while the other neither benefits or is harmed
Synergism
two organisms living together resulting in them being able to accomplish what neither organism could do on its own
Parasitism
relationship beneficial to one organism but harmful to the other
Author
brogdert
ID
54731
Card Set
micro fundamentals
Description
fundamentals
Updated
2010-12-10T04:07:59Z
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