VPH 123.2 Flashcards
can bacteria sporulate
yes
T/F Prolonging the lag phase so that bacteria would not multiply
T
T/F prevent lag phase by preventing a conducive envt for bacteria to grow
F. log
high initial count = __ shelf-life
shorter
low initial count = __ shelf-life
longer
pH of acidophiles
> 5.5
pH of alkaliphiles
8.0-11.5
pH neutrophiles
5.6 - 7.9
T/F Cells prefer internal environments with pH similar to that of the cytoplasm
F. external
pH of cytoplasm
7.2
Optimum pH for growth of bacteria
4.6-7.5
grow best at relatively low temps
psychofiles
capable of growing at low temperatures, preferring moderate temperatures
psychotropes
coexist with warm-blooded organisms, Capable of growing at freshly dressed carcass
mesophiles
Largest group of bacteria based on temp range
mesophiles
group with high temperature
thermofiles
Can resist high pressure, temp
not much bacteria of veterinary importance
hyperthermofiles
found in chilled/frozen food contamination
psychotropes
found in fresh meat contamination
mesophiles
optimum temp for bacterial growth
4.4 C to 60 C
Maximum time in the temperature danger zone
4 hrs
Classifications of bacteria based on oxygen requirement:
aerobes, anaerobes
Top global causes of infectious diarrhea in humans
Campylobacter, Salmonella, E.coli, Vibrio
