| TA | alkaline tuberculin; arterial tension; axillary temperature; tactile afferent; Takayasu arteritis; t... |
|---|---|
| Xan | xanthine |
| XDH | xanthine dehydrogenase |
| XDP | xanthine diphosphate; xeroderma pigmentosum |
| XMP | xanthine monophosphate |
| X-XO | Xanthine-xanthine oxidase |
|---|---|
| PA | Pyrrolizidine alkaloids |
| MIX | 1-Methyl-3-isobutyl-xanthine |
| 1-MX | 1-methyl xanthine |
| 1X | 1-methyl xanthine |
| xanthine alkaloids | Alkaloids, which contain xanthine as their nitrogenous base. (12 Dec 1998) |
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| methyl xanthine | <chemical, drug> Naturally occurring purine alkaloids such as theobromine, theophylline and caffeine (trimethyl xanthine). They inhibit cAMP phosphodiesterase and thus cause an increase in the intracellular cAMP concentration. (18 Nov 1997) |
|---|---|
| xanthine | <biochemistry> A purine, the starting point for purine degradation. Its methylated derivatives (theophylline, theobromine, caffeine) are potent cAMP phosphodiesterase inhibitors. (18 Nov 1997) |
| xanthine bronchodilator | <pharmacology> A group of medications that work by a common mechanism to effect bronchodilation (open up air passages) in the lungs. Used in the treatment of asthma and related conditions. Examples include: theophylline, aminophylline and dyphylline. (27 Sep 1997) |
| xanthine dehydrogenase | <enzyme> An enzyme that catalyses the oxidation of xanthine in the presence of NAD+ to form urate and NADH. It acts also on a variety of other purines and aldehydes. Chemical name: Xanthine:NAD+ oxidoreductase Registry number: EC 1.1.1.204 (12 Dec 1998) |
| xanthine nucleotide | The monophosphoric ester of xanthosine. An intermediate in GMP biosynthesis. Synonym: xanthidylic acid, xanthine nucleotide, xanthylic acid. (05 Mar 2000) |
| xanthine oxidase | <enzyme> Dehydrogenases involved in conversion of hypoxanthine to xanthine and xanthine to uric acid, as the final catabolism of purines. Deficient in the human disease xanthinuria. (18 Nov 1997) |
| xanthine ribonucleoside | 9-beta-d-ribosylxanthine;the deamination product of guanosine (O replacing -NH2). Synonym: xanthine ribonucleoside. Abbreviation: Xao (05 Mar 2000) |
| hypoxanthine-guanine-xanthine phosphoribosyltransferase | <enzyme> From tritrichomonas foetus; in contrast to EC 2.4.2.8, this enzyme also uses xanthine as substrate; mw 24 kD Registry number: EC 2.4.2.- Synonym: hgxprtase (26 Jun 1999) |
| desulfo xanthine dehydrogenase | <enzyme> Naturally occuring inactive form of xanthine dehydrogenase Registry number: EC 1.1.1.- (26 Jun 1999) |
| alkaloids | Organic nitrogenous bases. Many alkaloids of medical importance occur in the animal and vegetable kingdoms, and some have been synthesised. (12 Dec 1998) |
| belladonna alkaloids | Alkaloids obtained from various plants, especially the deadly nightshade (atropa belladonna), variety acuminata; atropine, hyoscyamine and scopolamine are classical, specific antimuscarinic agents with many pharmacologic actions; used mainly as antispasmodics. (12 Dec 1998) |
| bisbenzylisoquinoline alkaloids | A group of alkaloids whose base structure is two fused isoquinoline rings e.g., curare alkaloids. (05 Mar 2000) |
| rauwolfia alkaloids | <chemical> Alkaloids from rauwolfia serpentina benth and other species. The prototype is reserpine, which is a depleter of catecholamines and serotonin from the sympathetic postganglionic fibres and brain areas. They have been used in hypertension and psychoses despite their wide range of potentially adverse effects. Pharmacological action: adrenergic uptake inhibitors, antihypertensive agents, antipsychotic agents, sympatholytics. (12 Dec 1998) |
| veratrum alkaloids | <chemical> Alkaloids with powerful hypotensive effects isolated from american or european hellebore (veratrum viride ait. Liliaceae and veratrum album l. Liliaceae). They increase cholinergic and decrease adrenergic tone with appropriate side effects and at higher doses depress respiration and produce cardiac arrhythmias; only the ester alkaloids have been used as hypotensive agents in specific instances. They have been generally replaced by drugs with fewer adverse effects. Pharmacological action: antihypertensive agents. (12 Dec 1998) |
| Catharanthus alkaloids | <chemical> A class of alkaloids from the genus of apocyanaceous woody herbs including periwinkles. They are some of the most useful antineoplastic agent. Pharmacological action: antineoplastic agent, phytogenic, vasodilator agents. (12 Dec 1998) |
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