microbial growth Flashcards
psychrophiles growth range
-5 to 15 C
mesophiles growth range
25 to 45C
mesophiles growth range in human body
35 to 40
thermophiles growth range
45 to 70
oxygen reqs for obligate aerobes
absolute req for oxygen. use itto generate energy via aerobic respiration
oxygen reqs for obligate anaerobes
cannot multiply if oxygen is present, often killed by traces of oxygen due to toxic derivatives
oxygen reqs for facultative anaerobes
grow better if oxygen is present, but can grow without it. better with oxygen because aerobic resp yields more ATP
microaerophiles oxygen reqs
requires small amounts of oxygen (2-10%) for aerobic resp. higher concentrations are inhibitory
aerotolerant anaerobes oxygen reqs
indifferent to oxygen. can grow in its presence but do not use it to transform energy
order of most dependent on oxygen to least
obligate aerobes microaerophiles facultative aerobes aerotolerant anaeroges obligate anaerobes
what does superoxide dismutase do
converts O2- to H2O2 and O2
what does catalase do
converts H2O2 to H2O and O2
neutrophiles thrive in what ph range
5-8
acidophiles thrive in what ph range
below 5.5
are gut bacteria neutrophiles, acidophiles, or alkalophiles
neutrophiles with ability to change ph
alkalophiles thrive in what ph range
above 8.5
what is an osmotolerant bacteria
tolerant of high salt enviros (up to 10%)
what is a halophile
requires high levels of salt to live and multiply (more than 10%)
