oxidation


oxidation
1. Combination with oxygen. 2. Increasing the valence of an atom or ion by the loss from it of hydrogen or of one or more electrons thus rendering it more electropositive, as when iron is changed from the ferrous (2+) to the ferric (3+) state. 3. In bacteriology, the aerobic dissimilation of substrates with the production of energy and water; in contrast to fermentation, the transfer of electrons in the o. process is accomplished via the respiratory chain, which utilizes oxygen as the final electron acceptor.
- alpha-o., α-o. a form of o. of fatty acid s in which carbons are removed one at a time in the form of CO2; the α-carbon is first hydroxylated and then converted into a carbonyl; a deficiency of this pathway is associated with Refsum disease.
- beta-o., β-o. 1. o. of the β-carbon (carbon 3) of a fatty acid, forming the β-keto (β-oxo) acid analog; of importance in fatty acid catabolism; 2. the entire pathway for the catabolism of saturated fatty acid s containing an even number of carbon atoms; beta-o. (1) is a part of this pathway; acetyl-CoA is a major product of this pathway.
- end o. the last o. step in a catabolic pathway. SYN: terminal o..
- omega-o., ω-o. o. at the carbon atom farthest removed (ω-carbon) from the carboxyl group (carbon 1); thus, in this pathway, a dicarboxylic acid is formed; an important pathway in the degradation of prostaglandins.
- terminal o. SYN: end o..

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ox·i·da·tion .äk-sə-'dā-shən n
1) the act or process of oxidizing
2) the state or result of being oxidized

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ox·i·da·tion (ok″sĭ-daґshən) the act of oxidizing or state of being oxidized. Chemically it consists of the increase of positive charges on an atom or the loss of negative charges. Most biological oxidations are accomplished by the removal of a pair of hydrogen atoms (dehydrogenation) from a molecule. Such oxidations must be accompanied by reduction of an acceptor molecule. Univalent o. indicates loss of one electron; divalent o., the loss of two electrons.

Medical dictionary. 2011.

Look at other dictionaries:

  • Oxidation — Ox i*da tion, n. [Cf. F. oxidation.] (Chem.) The act or process of oxidizing, or the state or result of being oxidized. [1913 Webster] …   The Collaborative International Dictionary of English

  • oxidation — (n.) 1791, from Fr. oxidation (1787), noun of action from oxider oxidize, from oxide (see OXIDE (Cf. oxide)) …   Etymology dictionary

  • Oxidation — Oxidation. См. Окисление. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Oxidation — vgl. Oxydation …   Das Wörterbuch medizinischer Fachausdrücke

  • oxidation — ► NOUN Chemistry ▪ the process of oxidizing or the result of being oxidized. DERIVATIVES oxidative adjective …   English terms dictionary

  • oxidation — [äk΄si dā′shən] n. [Fr: see OXIDE & ATION] 1. any process in which oxygen combines with an element or substance, either slowly, as in the rusting of iron, or rapidly, as in the burning of wood 2. the process of increasing the positive valence or… …   English World dictionary

  • Oxidation — Oxidiertes (verrostetes) Eisen Die Oxidation (oder Oxydation) ist eine chemische Reaktion, bei der ein zu oxidierender Stoff (Elektronendonator) Elektronen abgibt. Die formale Oxidationszahl des Atoms im Molekül wird erhöht.[1] Oxidation …   Deutsch Wikipedia

  • Oxidation — Verbrennung; Elektronenabgabe; Oxydation * * * Oxi|da|ti|on 〈f. 20; Chem.〉 das Oxidieren; Ggs Reduktion (3) [<frz.; → Oxid] * * * O|xi|da|ti|on [zu ↑ Oxid] seit 1970 im dt. Fachsprachgebrauch abgelehnte S: Oxydation: im ursprünglichen Sinn Bez …   Universal-Lexikon

  • oxidation — [[t]ɒ̱ksɪde͟ɪʃ(ə)n[/t]] N UNCOUNT Oxidation is a process in which a chemical substance changes because of the addition of oxygen. [TECHNICAL] Carbon dioxide is a necessary result of the oxidation of carbon compounds …   English dictionary

  • oxidation — /ɒksəˈdeɪʃən/ (say oksuh dayshuhn) noun 1. the act or process of oxidising. –adjective 2. of or relating to oxidation: an oxidation potential. {French} …   Australian English dictionary

  • oxidation —    Originally, oxidation meant a chemical reaction in which oxygen combines with another substance. The usage of the word has been broadened to include any reaction in which electrons are transferred. The substance which gains electrons is the… …   Forensic science glossary


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