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Facultative anaerobe



An organism which is capable of producing energy through aerobic respiration and then switching back to anaerobic respiration depending on the amounts of oxygen and fermentable material in the environment.


In the presence of oxygen, facultative anaerobes use aerobic respiration; without oxygen some of them ferment, some use anaerobic respiration.

Some examples of facultative anaerobic bacteria are the Staphylococci (Gram positive), Escherichia coli (Gram negative), Corynebacterium (Gram positive), and Listeria (Gram positive). Organisms in the Kingdom Fungi can also be facultative anaerobic, such as yeasts.

Word origin: an- from Gk., "not, without," + Greek āero-, from āēr, air.

Compare: obligate anaerobe. See also: facultative anaerobe, microaerophile, aerotolerant.

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Help with unknown

... the test results I ran for my unknown: It is a Gram-negative bacillus facultative anaerobe Motility + Citrate + MR - (Unsure of the MRVP results, so not using it as a reliable ...

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by kayleighat
Sun Oct 20, 2013 2:43 am
Forum: Microbiology
Topic: Help with unknown
Replies: 0
Views: 3923

Help! "Unknown Bacteria" I have no idea where to look =T

... to look as far as what my bacteria is. I asked my instructor if a facultative anaerobe could produce oxidase, and she told me "No, due to only certain aerobic bacteria ...

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by stephanie1234
Mon Dec 03, 2012 4:44 am
Forum: Microbiology
Topic: Help! "Unknown Bacteria" I have no idea where to look =T
Replies: 1
Views: 4046

Unknown Organism

... TSI Ferments dextrose, lactose and/or sucrose I am 95% positive it is a facultative anaerobe. The ones marked with a "*" I am not completely sure about... My partner ...

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by CheriPeace
Fri Jun 29, 2012 9:08 pm
Forum: Microbiology
Topic: Unknown Organism
Replies: 5
Views: 5972

Indentifying an Unknown

Hi! I have a gram-negative, rod shaped, facultative anaerobe. The following are the tests I ran and whether or not they had positive (+) or negative (-) ...

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by tkdgirl
Wed Apr 04, 2012 8:22 pm
Forum: Microbiology
Topic: Indentifying an Unknown
Replies: 0
Views: 1539

Identifying Bacteria

... + spore stain- + acid-fast - negative capsule - + optimal temp. 37 facultative anaerobe all positive for in acid-gluocose,lactose, sucrose, mannitol nethyl red- + VP- negative ...

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by marilynkatie
Sun Dec 04, 2011 5:11 pm
Forum: Microbiology
Topic: Identifying Bacteria
Replies: 1
Views: 1744
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