An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It may react negatively or even die if oxygen is present. An anaerobic organism may be unicellular (e.g. protozoans, bacteria) or multicellular.
For practical purposes, there are three categories of anaerobe:
- Obligate anaerobes, which are harmed by the presence of oxygen.
- Aerotolerant organisms, which cannot use oxygen for growth, but tolerate its presence.
- Facultative anaerobes, which can grow without oxygen but use oxygen if it is present.
Obligate anaerobes may use fermentation or anaerobic respiration. Aerotolerant organisms are strictly fermentative. In the presence of oxygen, facultative anaerobes use aerobic respiration; without oxygen, some of them ferment; some use anaerobic respiration.
There are many anaerobic fermentative reactions.
Fermentative anaerobic organisms mostly use the lactic acid fermentation pathway:
The energy released in this equation is approximately 150 kJ per mol, which is conserved in regenerating two ATP from ADP per glucose. This is only 5% of the energy per sugar molecule that the typical aerobic reaction generates.
Plants and fungi (e.g., yeasts) in general use alcohol (ethanol) fermentation when oxygen becomes limiting:
- C6H12O6 (glucose) + 2 ADP + 2 phosphate → 2 C2H5OH + 2 CO2↑ + 2 ATP
The energy released is about 180 kJ per mol, which is conserved in regenerating two ATP from ADP per glucose.
Anaerobic bacteria and archaea use these and many other fermentative pathways, e.g., propionic acid fermentation, butyric acid fermentation, solvent fermentation, mixed acid fermentation, butanediol fermentation, Stickland fermentation, acetogenesis, or methanogenesis.
Since normal microbial culturing occurs in atmospheric air, which is an aerobic environment, the culturing of anaerobes poses a problem. Therefore, a number of techniques are employed by microbiologists when culturing anaerobic organisms, for example, handling the bacteria in a glovebox filled with nitrogen or the use of other specially sealed containers, or techniques such as injection of the bacteria into a dicot plant, which is an environment with limited oxygen. The GasPak System is an isolated container that achieves an anaerobic environment by the reaction of water with sodium borohydride and sodium bicarbonate tablets to produce hydrogen gas and carbon dioxide. Hydrogen then reacts with oxygen gas on a palladium catalyst to produce more water, thereby removing oxygen gas. The issue with the Gaspak method is that an adverse reaction can take place where the bacteria may die, which is why a thioglycollate medium should be used. The thioglycollate supplies a medium mimicking that of a dicot, thus providing not only an anaerobic environment but all the nutrients needed for the bacteria to thrive.
Complex multicellular life that does not need oxygen is said to be rare, however there are examples of such organisms.
At least three species have been discovered in the hypersaline anoxic L'Atalante basin at the bottom of the Mediterranean Sea in 2010, metabolising with hydrogen, lacking mitochondria and instead using hydrogenosomes.
- Upcroft P, Upcroft JA. "Drug Targets and Mechanisms of Resistance in". pp. 150–164. doi:10.1128/CMR.14.1.150-164.2001. PMC 88967. PMID 11148007.
- Levinson, W. (2010). Review of Medical Microbiology and Immunology (11th ed.). McGraw-Hill. pp. 91–93. ISBN 978-0-07-174268-9.
- Danovaro R; Dell'anno A; Pusceddu A; Gambi C; et al. (April 2010). "The first metazoa living in permanently anoxic conditions". BMC Biology 8 (1): 30. doi:10.1186/1741-7007-8-30. PMC 2907586. PMID 20370908.
- Prescott LM, Harley JP, Klein DA (1996). Microbiology (3rd ed.). Wm. C. Brown Publishers. pp. 130–131. ISBN 0-697-29390-4.
- Brooks GF, Carroll KC, Butel JS, Morse SA (2007). Jawetz, Melnick & Adelberg's Medical Microbiology (24th ed.). McGraw Hill. pp. 307–312. ISBN 0-07-128735-3.
- Hogg, S. (2005). Essential Microbiology (1st ed.). Wiley. pp. 99–100. ISBN 0-471-49754-1.
- "GasPak System". Accessed May 3, 2008.
- Oxygen-Free Animals Discovered-A First, National Geographic news
- Schöttler, U. (November 30, 1979). "On the Anaerobic Metabolism of Three Species of Nereis (Annelida)" (PDF). Marine Ecology Progress Series 1: 249–54. doi:10.3354/meps001249. ISSN 1616-1599. Retrieved February 14, 2010.
- Roberts, Larry S., John Janovay (2005). Foundations of Parasitology (7th ed.). New York: McGraw-Hill. pp. 405–407.