| p-rosolic acid | <chemistry> A red colouring matter derived from phenol; called also, in commerce, yellow coralin. Origin: L. Aurum gold. Source: Websters Dictionary (01 Mar 1998) |
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| p-selectin | <cell biology> Cell adhesion molecule and CD antigen that mediates the adhesion of neutrophils and monocytes to activated platelets and endothelial cells. (12 Dec 1998) |
| P-sinistrocardiale | An electrocardiographic P-wave characteristic of overloading of the left atrium; often erroneously called P-mitrale, as the syndrome can result from any overloading of the left atrium from any cause. (05 Mar 2000) |
| p-sulfamylacetanilide | An intermediate in the synthesis of sulfanilamide; formed in animal bodies by acetylation of sulfanilamide. Synonym: p-sulfamylacetanilide. (05 Mar 2000) |
| P-TEN phosphatase | <enzyme> A dual-specificity phosphatase that dephosphorylates ser, thr and tyr residues; gene is located on human chromosome 10q23; has been sequenced Registry number: EC 3.1.3.- (26 Jun 1999) |
| p-terphenyl | C6H5-C6H4-C6H5;useful as a scintillator in scintillation. (05 Mar 2000) |
| P-type ATPase | <enzyme> One of three major classes of ion transport ATPases, characterised by vanadate sensitivity and a phosphorylated intermediate. The archetype is the sodium pump. See: F-type ATPase, V-type ATPase. (18 Nov 1997) |
| P/O quotient | A measure of oxidative phosphorylation; the ratio of phosphate radicals esterified (forming adenosine 5'-triphosphate from adenosine 5'-diphosphate) to atoms of oxygen consumed by mitochondria; normally, the ratio is 3 (starting from NADH). Synonym: P/O quotient. (05 Mar 2000) |
| P/O ratio | A measure of oxidative phosphorylation; the ratio of phosphate radicals esterified (forming adenosine 5'-triphosphate from adenosine 5'-diphosphate) to atoms of oxygen consumed by mitochondria; normally, the ratio is 3 (starting from NADH). Synonym: P/O quotient. (05 Mar 2000) |
| P1 | <abbreviation> Parental generation; symbol for inorganic orthophosphate (should not be used when covalently linked to another moiety). (05 Mar 2000) |
| p107 | <protein> Protein (107 kD) with many similarities to retinoblastoma gene product. Binds to E2F and is found in the cyclin/E2F complex together with p33cdk2. (18 Nov 1997) |
| p150 protein kinase | <enzyme> Mw 150 kD; forms a cellular complex with phosphatidylinositol 3-kinase; a homolog of vps15 protein kinase; amino acid sequence given in first source Registry number: EC 2.7.1.- (26 Jun 1999) |
| p18 component, aminoacyl tRNA synthetase | <enzyme> Shares a protein motif with the beta and gamma subunits of eukaryotic elongation factor 1; amino acid sequence given in first source Registry number: EC 6.1.1.- Synonym: p18 aminoacyl-trna synthase (26 Jun 1999) |
| p21(ras) farnesyl-protein transferase | <enzyme> Transfers the farnesyl moiety from farnesyl pyrophosphate to a cysteine in p21(ras) proteins; composed of an alpha and a beta subunit Registry number: EC 2.5.1.- Synonym: farnesyl-protein transferase p21(ras), ras p21 farnesyl-protein transferase, protein-cysteine farnesyltransferase, pc farnesyltransferase, protein farnesyltransferase, p21(ras) farnesyltransferase, farnesyl-protein transferase-alpha, farnesyl-protein transferase-beta, ft alpha, ft beta, caax farnesyltransferase, ftase enzyme (26 Jun 1999) |
| p24 | <protein> Protein antigen from HIV's core that can be measured in blood and other body fluids. Measurement of p24 levels in the blood have been used to monitor viral activity, although this is not considered a very accurate method due to the existence of p24 antibody that binds with the antigen and makes it undetectable. (09 Oct 1997) |