Biochemistry

A Dictionary of Plant Sciences A Dictionary of Zoology The Columbia Encyclopedia,... A Dictionary of Nursing Further reading

citric acid cycle

A Dictionary of Plant Sciences | 1998 | | Copyright

citric acid cycle (Krebs' cycle, tricarboxylic acid cycle) The cyclic series of reactions which represent the principal means by which most living cells provide hydrogen and electrons for the generation of ATP via the electron-transport chain and oxidative phosphorylation. The hydrogen is taken up by NAD (nicotinamide adenine dinucleotide) or FAD (flavin adenine dinucleotide) and passed into the electron-transport chain. The reactions result in oxidative decarboxylation. The sequence is initiated when acetyl groups, fed in by acetyl coenzyme A, are dehydrogenated (i.e. oxidized), to release 4 pairs of hydrogen atoms, and decarboxylated to form 2 molecules of carbon dioxide. This yields oxaloacetic acid and then citric acid. The citric acid passes through a series of reactions wherein oxaloacetic acid is reformed, and two moles of CO₂ and water and one mole of ATP are synthesized. Since two molecules of acetyl coenzyme A are formed for each glucose molecule that is oxidized the cycle rotates twice, forming two moles of ATP.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

MICHAEL ALLABY. "citric acid cycle." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "citric acid cycle." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O7-citricacidcycle.html

MICHAEL ALLABY. "citric acid cycle." A Dictionary of Plant Sciences. 1998. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-citricacidcycle.html

Learn more about citation styles

citric-acid cycle

A Dictionary of Zoology | 1999 | | Copyright

citric-acid cycle (Krebs's cycle, tricarboxylic-acid cycle) A cyclic series of reactions which take place in mitochondria, in the presence of oxygen. The cycle represents the principal means by which most living cells provide electrons for the generation of ATP via the electron-transport chain and oxidative phosphorylation. The sequence is initiated by the condensation of acetyl coenzyme A with oxaloacetic acid to form citric acid. This then passes through a series of reactions wherein oxaloacetic acid is reformed, and 2 moles of CO₂ and water and 12 moles of ATP are synthesized.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

MICHAEL ALLABY. "citric-acid cycle." A Dictionary of Zoology. 1999. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "citric-acid cycle." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O8-citricacidcycle.html

MICHAEL ALLABY. "citric-acid cycle." A Dictionary of Zoology. 1999. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-citricacidcycle.html

Learn more about citation styles

citric acid cycle

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

citric acid cycle see Krebs cycle .

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"citric acid cycle." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

"citric acid cycle." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1E1-X-citrc-ac-cy.html

"citric acid cycle." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-citrc-ac-cy.html

Learn more about citation styles

citric acid cycle

A Dictionary of Nursing | 2008 | Copyright

citric acid cycle n. see Krebs cycle.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"citric acid cycle." A Dictionary of Nursing. 2008. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

"citric acid cycle." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O62-citricacidcycle.html

"citric acid cycle." A Dictionary of Nursing. 2008. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-citricacidcycle.html

Learn more about citation styles

citric-acid cycle

A Dictionary of Biology | 2004 | Copyright

citric-acid cycle See Krebs cycle.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

"citric-acid cycle." A Dictionary of Biology. 2004. Encyclopedia.com. 31 May. 2012 <http://www.encyclopedia.com>.

"citric-acid cycle." A Dictionary of Biology. 2004. Encyclopedia.com. (May 31, 2012). http://www.encyclopedia.com/doc/1O6-citricacidcycle.html

"citric-acid cycle." A Dictionary of Biology. 2004. Retrieved May 31, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-citricacidcycle.html

Learn more about citation styles

Free newspaper and magazine articles

	Citric acid safeguards stainless.(RAPID TRAVERSE) Magazine article from: Modern Machine Shop; 6/1/2010
	Assessment of biochemical and nutritional individuality through organic acid... Magazine article from: Townsend Letter for Doctors and Patients; 1/1/2006
	Urinary organic acid analysis: a powerful clinical tool. Magazine article from: Townsend Letter for Doctors and Patients; 10/1/2004