| prepenial | <anatomy> Situated in front of, or anterior to, the penis. Source: Websters Dictionary (01 Mar 1998) |
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| prepenicillinase | <enzyme> Precursor of penicillinase. Registry number: EC 3.5.2.- (26 Jun 1999) |
| prepericardiac lymph nodes | Several small lymph nodes located between the pericardium and the sternum, in the anterior mediastinum. Synonym: nodi lymphatici prepericardiales. (05 Mar 2000) |
| preperitoneal | Denoting a fatty layer between the peritoneum and the transversalis fascia in the lower anterior abdominal wall. (05 Mar 2000) |
| prephenate aminotransferase | <enzyme> From tobacco; forms l-arogenate (intermediate precursor of tyrosine and phenylalanine); l-aspartate and l-glutamate are only amino-donors Registry number: EC 2.6.1.- (26 Jun 1999) |
| prephenate dehydratase | <enzyme> An enzyme that catalyses the conversion of prephenate to phenylpyruvate with the elimination of water and carbon dioxide. In the enteric bacteria this enzyme also possesses chorismate mutase activity, thereby catalyzing the first two steps in the biosynthesis of phenylalanine. Chemical name: Prephenate hydro-lyase (decarboxylating) Registry number: EC 4.2.1.51 (12 Dec 1998) |
| prephenate dehydrogenase | <enzyme> An enzyme that catalyses the conversion of prephenate to p-hydroxyphenylpyruvate in the presence of NAD. In the enteric bacteria, this enzyme also possesses chorismate mutase activity, thereby catalyzing the first two steps in the biosynthesis of tyrosine. Chemical name: Prephenate:NAD+ oxidoreductase (decarboxylating) Registry number: EC 1.3.1.12 (12 Dec 1998) |
| prephenic acid | 1-Carboxy-4-hydroxy-2,5-cyclohexadiene-1-pyruvic acid;an intermediate in the microbial conversion of shikimic acid to l-phenylalanine and l-tyrosine. (05 Mar 2000) |
| prephytoene pyrophosphate dehydrogenase | <enzyme> Encoded by gene crte; reaction product of above enzyme is a phytoene; gene found in the cyanella (plastid) DNA of an eukaryotic alga, cyanophora paradoxa; amino acid sequence given in first source Registry number: EC 1.- Synonym: ppp-dehydrogenase, crte gene product, geranylgeranyl pyrophosphate synthase, geranylgeranyl-pyrophosphate synthase, albino-3 gene product (26 Jun 1999) |
| prepiriform gyrus | A gyrus covering deeply placed amygdaloid nucleus; concerned with olfactory function. Synonym: anterior piriform gyrus. (05 Mar 2000) |
| preplacental | Before formation of a placenta. (05 Mar 2000) |
| prepollent | <anatomy, embryology> An extra first digit, or rudiment of a digit, on the preaxial side of the pollex. (05 Mar 1998) |
| preponderate | 1. To outweigh; to overpower by weight; to exceed in weight; to overbalance. "An inconsiderable weight, by distance from the center of the balance, will preponderate greater magnitudes." (Glanvill) 2. To overpower by stronger or moral power. 3. To cause to prefer; to incline; to decide. "The desire to spare Christian blood preponderates him for peace." (Fuller) See: ponder. Origin: L. Praeponderatus, p. P. Of praeponderare; prae = before + ponderare to weigh, fr, pondus, ponderis, a weight. (05 Mar 1998) |
| prepossess | 1. To preoccupy, as ground or land; to take previous possession of. 2. To preoccupy, as the mind or heart, so as to preclude other things; hence, to bias or prejudice; to give a previous inclination to, for or against anything; especially, to induce a favorable opinion beforehand, or at the outset. "It created him enemies, and prepossessed the lord general." (Evelyn) Origin: Prepossessed; Prepossessing. Source: Websters Dictionary (01 Mar 1998) |
| preposterous | 1. Having that first which ought to be last; inverted in order. 2. Contrary to nature or reason; not adapted to the end; utterly and glaringly foolish; unreasonably absurd; perverted. See: absurd. Synonym: Absurd, perverted, wrong, irrational, foolish, monstrous. Origin: L. Praeposterus; prae = before + posterus coming after, latter. See Posterior. Source: Websters Dictionary (01 Mar 1998) |