| receptors, polymeric immunoglobulin | Specialised fc receptors (receptors, fc) for polymeric immunoglobulins, which mediate transcytosis of polymeric IgA and IgM into external secretions. They are found on the surfaces of epithelial cells and hepatocytes. After binding to IgA, the receptor-ligand complex undergoes endocytosis, transport by vesicle, and secretion into the lumen by exocytosis. Before release, the part of the receptor (secretory component) that is bound to IgA is proteolytically cleaved from its transmembrane tail. (12 Dec 1998) |
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| polymeric | <chemistry> Having the same percentage composition (that is, having the same elements united in the same proportion by weight), but different molecular weights; often used with with; thus, cyanic acid (CNOH), fulminic acid (C2N2O2H2), and cyanuric acid (C3N3O3H3), are polymeric with each other. The figures expressing the number of atoms of each element in a number of polymeric substances are respectively multiples and factors of each other, or have some simple common divisor. The relation may be merely a numerical one, as in the example given above, or a chemical one, as in the case of aldehyde, paraldehyde, and metaldehyde. Origin: Poly- + Gr. Part. Source: Websters Dictionary (01 Mar 1998) |
| shelled | <zoology> Having a shell. Source: Websters Dictionary (01 Mar 1998) |
| soft-shelled | Having a soft or fragile shell. <zoology> Soft-shell clam Same as Soft tortoise, under Soft. Source: Websters Dictionary (01 Mar 1998) |
| theophylline | <drug> Inhibits cAMP phosphodiesterase and is often used in conjunction with exogenous dibutyryl cyclic AMP to raise cellular cAMP levels. Other, less potent, methylxanthines are caffeine, theobromine and aminophylline. (18 Nov 1997) |
| theophylline aminoisobutanol | <drug> A diuretic and bronchodilator. Synonym: theophylline aminoisobutanol. (05 Mar 2000) |
| theophylline calcium salicylate | A mixture of calcium theophylline and sodium salicylate in molecular proportion; has the same actions and uses as theophylline. (05 Mar 2000) |
| theophylline ethanolamine | Theophylline monoethanolamine, with the same actions and uses as theophylline. (05 Mar 2000) |
| theophylline ethylenediamine | <drug> An inhibitor of cAMP phosphodiesterase. (18 Nov 1997) |
| theophylline isopropanolamine | Has the same actions and uses as aminophylline, but a more rapid onset and a longer duration of action. (05 Mar 2000) |
| theophylline oxidase | <enzyme> Catalyses the oxidation of theophylline to 1,3-dimethyluric acid in the presence of ferricytochrome c Registry number: EC 1.5.99.- (26 Jun 1999) |
| theophylline sodium acetate | A mixture of theophylline sodium and sodium acetate, with 60% of theophylline; has the same uses as theophylline. (05 Mar 2000) |
| theophylline sodium glycinate | Equilibrium mixture containing theophylline sodium and glycine in approximately molecular proportions, buffered with an additional mole of glycine; similar in action and uses to aminophylline but more stable in air, and less irritating to the gastric mucosa. (05 Mar 2000) |
| aberrant complex | An anomalous electrocardiographic complex, more specifically an abnormal ventricular complex caused by abnormal intraventricular conduction of a supraventricular impulse. (05 Mar 2000) |
| activated complex | <chemistry> State of highest energy during a reaction. When reactants form the activated complex, bond breaking and bond formation is occurring. Synonym: transition state. (09 Jan 1998) |