6: Terms Flashcards
phototroph
use visible light rays as an energy source
barophile
exist under pressures up to 1000x the pressure of the atmosphere
rupture when exposed to normal atmospheric pressure
symbiosis
2 organisms living in close association
mutualism
organisms living in obligatory but mutually beneficial relationships
both organisms benefiting from one another
commensalism
one organism benefiting from the other without harming or benefiting it
parasitism
host organism provides parasite with nutrients and a habitat while suffering
one organism benefits at the expense of the other
antagonism
association between free-living species that arises when members of a community compete
antibiosis
production of inhibitory compounds into the surrounding environment that inhibit/destroy another microbe within that same habitat
synergism
interrelationship between two organisms that benefits them, but not necessarily for survival
produce a result that neither could do alone
growth curve
predictable pattern of bacterial population growth in a closed system
measured by inoculation in liquid medium, incubation, sampling in intervals, inoculating in solid medium, and inspection
lag phase
“flat” period of growth
due to: newly inoculated cells, slow multiplication, diluted sample
exponential growth (log) phase
growth curve increases and continues as lone as cells have adequate nutrients and favorable environment
stationary growth phase
equal cell birth and death rates
slow cell division
caused by: depletion of nutrients and oxygen and excretion pollutants into growth medium
coulter counter
scans fluid as it passes through a tiny pipette
flow cytomete
similar to coulter counter, but measures cell size and differentiates between live and dead cells
