Microscopic single-celled organisms that thrive in diverse

environments. They constitute a large domain of prokaryotic microorganisms.

Extremophilic bacteria or archaea which are cold‐ loving,

having an optimal temperature for growth at about 15°C or lower, a

maximal temperature for growth at about 20°C and a minimal

temperature for growth at 0°C or lower.

Organisms growing in the absence of oxygen.

Microorganisms requiring free oxygen in order to grow.

An anaerobe produces the toxin botulin, one of the

most poisonous substances known.

facultative anaerobes which cause infectious food

poisoning.

a facultative aerobe that causes intoxication. It

lives in the nose, throat, hair and skin and on animal hides.

an organism—a type of extremophile—that thrives at

relatively high temperatures, between 41 and 122 °C (106 and 252 °F).

an organism that grows best in moderate temperature,

neither too hot nor too cold, typically between 20 and 45 °C (68 and 113

°F).