| O-phosphono- | <prefix> Prefix indicating a phosphonic acid radical (-PO3H2) attached through an oxygen atom, hence a phosphoric ester. See: phospho-. (05 Mar 2000) |
|---|---|
| O-phosphoserine | 2-O3 P- OCH2CH(NH3)+COO-;the phosphoric ester of serine; found as a constituent in many proteins (e.g., phosphorylase a and phosvitin). (05 Mar 2000) |
| o-phthalaldehyde | <chemical> 1,2-benzenedicarboxaldehyde. A reagent that forms fluorescent conjugation products with primary amines. It is used for the detection of many biogenic amines, peptides, and proteins in nanogram quantities in body fluids. Pharmacological action: disinfectants, indicators and reagents. Chemical name: 1,2-Benzenedicarboxaldehyde (12 Dec 1998) |
| o-point | <physics> Place where the poloidal magnetic field vanishes in such a way that the nearby flux surfaces are elliptical, for example on the magnetic axis or at the centre of a magnetic island. (See also X-Point.) (09 Oct 1997) |
| O-R system | <abbreviation> Oxidation-reduction system. (05 Mar 2000) |
| O-sialoglycoprotein endopeptidase | <enzyme> Specific for o-sialoglycoproteins such as glycophorin a; amino acid sequence given in first source Registry number: EC 3.4.24.57 Synonym: pht a1 glycoprotease, o-glycosylated glycoprotein protease, sialoglycoprotease, glycophorin a protease, glycophorin a glycoprotease, glycoprotease, pasteurella haemolytica a1 (26 Jun 1999) |
| o-succinylbenzoic acid synthase | <enzyme> E coli enzyme; with shchc synthase catalyses formation of o-succinylbenzoic acid from isochorismic acid and alpha-ketoglutarate in presence of thiamine pyropyrophosphate; succinic saemialdehyde anion is formed by decarboxylation of alpha-ketoglutarate by thiamine pyrophosphate; anion then attacks isochorismic acid, initiating aromatization with elimination of pyruvate and h2o Registry number: EC 4.1.99.- Synonym: ortho-succinylbenzoic acid synthase, osb synthase, 2-succinylbenzoic acid synthase (26 Jun 1999) |
| O-succinylhomoserine (thiol)-lyase | <enzyme> An enzyme catalyzing the reaction between cystathionine and succinate to form l-cysteine and O-succinyl-l-homoserine. Synonym: cystathionine gamma-synthase. (05 Mar 2000) |