| polus anterior lentis | The central point on the anterior surface of the lens of the eye. Synonym: polus anterior lentis. (05 Mar 2000) |
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| polus frontalis cerebri | The most anterior promontory of each cerebral hemisphere. Synonym: polus frontalis cerebri, frontal pole. (05 Mar 2000) |
| polus occipitalis cerebri | The most posterior promontory of each cerebral hemisphere; the apex of the occipital lobe. Synonym: polus occipitalis cerebri, occipital pole. Pelvic pole, the breech end of the foetus. (05 Mar 2000) |
| polus posterior bulbi oculi | The centre of the posterior curvature of the eye. Synonym: polus posterior bulbi oculi. (05 Mar 2000) |
| polus posterior lentis | The central point on the posterior surface of the lens. Synonym: polus posterior lentis. (05 Mar 2000) |
| polus temporalis cerebri | The most prominent part of the anterior extremity of the temporal lobe of each cerebral hemisphere, a short distance below the fissure of Sylvius. Synonym: polus temporalis cerebri, temporal pole. (05 Mar 2000) |
| polwig | <zoology> A polliwig. Holland. Source: Websters Dictionary (01 Mar 1998) |
| poly | 1. <prefix> A combining form or prefix denoting many, multiplicity, as polygon, a figure of many angles; polyatomic, having many atoms; polychord, polyconic. 2. <botany> A whitish woolly plant (Teucrium Polium) of the order Labiatae, found throughout the Mediterranean region. The name, with sundry prefixes, is sometimes given to other related species of the same genus. 3. <chemistry> A prefix meaning polymer of, as in polypeptide, polysaccharide, polynucleotide; often used with symbols, as in poly(A) for poly(adenylic acid), poly(Lys) for poly(l-lysine). Origin: G. Polys, much, many Source: Websters Dictionary (21 Jun 2000) |
| poly A | <biochemistry, molecular biology> Polynucleotide chain consisting entirely of residues of adenylic acid (i.e. The base sequence is AAAA.AAAA). Polyadenylic chains of various lengths are found at the 3' end of most eukaryotic mRNAs, the poly A tail. (11 Jan 1998) |
| poly A hydrolase | <enzyme> Endoribonuclease and exoribonuclease isolated; specific to poly(a) Registry number: EC 3.1.4.- Synonym: polyadenylase, polyadenylate hydrolase, poly a exonuclease (26 Jun 1999) |
| poly A specific exoribonuclease | <enzyme> Acts on 2' or 3'-linked oligoriboadenylates to liberate 5'-AMP Registry number: EC 3.1.13.- Synonym: 2',3'-exoribonuclease, 3'-exoribonuclease (26 Jun 1999) |
| poly A tail | <molecular biology> A sequence of adenine nucleotides that get added to the 3' end of some primary transcript messenger RNA molecules in eukaryotes during post-transcriptional processing. The added tail is believed to confer stability to the molecule. Histone mRNA do not have poly A tail. The poly A tail is added post transcriptionally to the primary transcript as part of the nuclear processing of RNA yielding hnRNAs with 60-200 adenylate residues in the tail. In the cytoplasm the poly A tail on mRNAs is gradually reduced in length. The function of the poly A tail is not clear but it is the basis of a useful technique for the isolation of eukaryotic mRNAs. The technique uses an affinity column with oligo(u) or oligo(dT) immobilised on a solid support. If cytoplasmic RNA is applied to such a column, poly A rich RNA (mRNA) will be retained. (13 Nov 1997) |
| poly a-u | <chemical> A double-stranded polyribonucleotide comprising polyadenylic and polyuridylic acids and believed to be a stimulant of the immune system through induction of interferon. Pharmacological action: antiviral agents, interferon inducers. Chemical name: 5'-Adenylic acid, homopolymer, complex with 5'-uridylic acid homopolymer (1:1) (12 Dec 1998) |
| poly adenosine diphosphate ribose | <chemical> A polynucleotide formed from NAD in the presence of NAD+ nucleosidase. Chemical name: Adenosine 5'-(trihydrogen diphosphate), P'-5-ester with D-ribose, homopolymer (12 Dec 1998) |
| poly ADP-ribose glycohydrolase | <enzyme> Splits ribose-ribose bonds; glycohydrolase I has a higher molecular weight and is tightly bound to mammalian cell nuclei; glycohydrolase II has lower molecular weight and is found in cytosol Registry number: EC 3.2.1.- Synonym: (ADP-ribose)n glycohydrolase I, (ADP-ribose)n glycohydrolase II (26 Jun 1999) |