microbial growth
what does k represents
K refers to the growth rate constant
what is the preferred temperature range of psychrotrophs
biofilm
bunch of microbes that are members of a complex slime-enclosed community
function of fungistatic
to inhibit growth
T/F larger populations in a biofilm take a shorter period to kill than smaller population because of the similarities and homogenuity
False; Biofilm think of heterogenuity!! but larger populations take a longer period to kill
adapting to a new medium or any other new conditions
Lag Phase
what type of microbe does not require 02 but grows better in its presence
Facultative anaerobes
N-acylhomoserine lactone diffusing across the plasma membrane is a type of what
quorum sensing
what type of sterilization kills endospores and how do they test whether or not it worked
Steam sterilization (autoclave) and they include strips with geobacilllus stearothermophilus to ensure that the method was effective
t/f alcohols are bactericidal, fungicidal and sporicidal; and can denature proteins and possibly dissolve membrane lipids
False alcohols are not sporicidals BUT they can denature proteins and possibly dissolve membrane lipids
Nutrient limitation
Limited oxygen availability
toxic waste acumulation
carrying capacity
where would you expect to see bacterial growth in an obligate aerobe vs a strict anaerobe and why would notice this pattern
obligate aerobe would be found in the oxic zone and anaerobe would be found in the anoxic zone.
Because of their oxygen preference or aversion to it
key difference between sterilization and disenfection
sterilization destroys all viable organisms and disinfection kills/inhibits disease causing organisms
What type of relationship exists between the exposure time to an antimicrobial agent and the number of organisms killed?
what is the term often used to describe this interaction?
The term is contact time and it shows a direct relationship. The longer the exposure, the more organisms are killed.
T/F Phenols are considered method of sterilization; and they are commonly used in labs and hospitals
False! Phenols are considered disinfectants BUT they are commonly used in labs and hospitals
what do these variables represent
Nt=N0 x 2n
Nt= population at given time
N0=initial population
N= number of generations in time (t)
an archaea that lives in deep sea with high hydrostatic pressure would be classified as a
barophile
function of bactericides and/or viricides
to kill
why are organisms in biofilms less susceptible to many antimicrobial agents
because of the biofilm heterogenuity
t/f antiseptics reduce number of pathogens on human tissue in order to prevent infections
True