| polyacron | Origin: NL, fr. Gr. Polys many + 'akron summit. <geometry> A solid having many summits or angular points; a polyhedron. Source: Websters Dictionary (01 Mar 1998) |
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| polyacrylamide | A branched polymer of acrylamide (H2C==CHCONH2) that is used in gel electrophoresis; e.g., R-CH2-CH(CONH2)-CH(CONHRCH(CONHR')-R'. (05 Mar 2000) |
| polyacrylamide gel electrophoresis | Analytical and separative technique in which molecules, particularly proteins, are separated by their different electrophoretic mobilities in a hydrated gel. The gel suppresses convective mixing of the fluid phase through which the electrophoresis takes place and contributes molecular sieving. Commonly carried out in the presence of the anionic detergent sodium dodecylsulphate (SDS). SDS denatures proteins so that noncovalently associating sub unit polypeptides migrate independently and by binding to the proteins confers a net negative charge roughly proportional to the chain weight. See: SDS PAGE. (21 Jun 1999) |
| polyactina | <zoology> An old name for those Anthozoa which, like the actinias, have numerous simple tentacles. Origin: NL. See Poly-, and Actinia. Source: Websters Dictionary (01 Mar 1998) |
| polyadelphia | <botany> A Linnaean class of plants having stamens united in three or more bodies or bundles by the filaments. Origin: NL, fr. Gr. Many + brother. Source: Websters Dictionary (01 Mar 1998) |
| polyadelphous | <botany> Belonging to the class Polyadelphia; having stamens united in three or more bundles. Source: Websters Dictionary (01 Mar 1998) |
| polyadenitis | Inflammation of many lymph nodes, especially with reference to the cervical group. (05 Mar 2000) |
| polyadenitis maligna | <microbiology> This rare bacterial infection due to Yersinia pestis. It can cause painful, enlarged lymph nodes, fever, headache and prostration 2-7 days after a flea bite. May also cause pneumonia and sepsis. Transmitted in rodents and humans via an infected flea bite. The incubation period is 2-10 days. Yersinia infection is now rare in Western countries. Third world countries (for example India) can have epidemics of Yersinia. Treatment with antibiotics is necessary or most individuals will die. Even with antibiotic treatment the death rate is 5%. (15 Nov 1997) |
| polyadenopathy | Adenopathy affecting many lymph nodes. Synonym: polyadenosis. (05 Mar 2000) |
| polyadenosis | Adenopathy affecting many lymph nodes. Synonym: polyadenosis. (05 Mar 2000) |
| polyadenous | Pertaining to or involving many glands. (05 Mar 2000) |
| polyadenylation | 1. The process of formation of poly(adenylic acid). 2. The covalent modification of a macromolecule (e.g., mRNA) by the formation of a polyadenylyl moiety covalent linked to the macromolecule. (05 Mar 2000) |
| polyadenylic acid | <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) |
| polyalcohol | An aliphatic or alicyclic molecule characterised by the presence of two or more hydroxyl groups; e.g., glycerol, inositol. A polymer of an alcohol. Origin: G. Polys, much, many + alcohol (05 Mar 2000) |
| polyallelism | The existence of multiple alleles at a genetic locus. (05 Mar 2000) |