Extremophiles

thermophile

optimal growth in temps 50-80C

hyperthermophile

optimal growth above 80C

mesophile

optimal growth 20-50C

psychrophile

optimal growth -5-20C

acidophile

optimal growth <6 pH

neutrophile

optimal growth 6-8 pH

alkaphile

optimal growth >8 pH

osmophile

optimal growth at higher osmotic pressure

halophile

optimal growth at higher salt levels

halotolerant

optimal growth in absence of salt

obligate aerobe

requires O2 gas for aerobic respiration

microaerophile

obligate aerobe, optimal growth with 2-10% O2 concentration

facultative aerobe/aerotolerant anaerobe/obligate fermentator

anaerobic, not harmed by O2 presence, fermentation only

facultative anaerobe

prefers aerobic respiration, but can undergo anerobic respiration and fermentation

obligate anaerobe

anaerobic respiration, O2 presence can be fatal