| 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) |
| vinca 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) |
| cinchona alkaloids | Alkaloids extracted from various species of cinchona. (12 Dec 1998) |
| salsoline alkaloids | Tetrahydroisoquinolinol alkaloids in both dextro and levo forms, originally from salsola richteri; may be hypotensive due to inhibition of certain brain enzymes; may be formed de novo in brain from dopamine during alcoholism. (12 Dec 1998) |
| xanthine alkaloids | Alkaloids, which contain xanthine as their nitrogenous base. (12 Dec 1998) |
| pyrrolizidine alkaloids | <chemical> Alkaloids found in various species of senecio and other plants. There are at least ten different chemicals, many of them hepatotoxic, teratogenic, and carcinogenic. The plants may cause damage in grazing herds, but no longer have medical use. Pharmacological action: carcinogens. (12 Dec 1998) |
| solanaceous alkaloids | Alkaloids, mainly tropanes, elaborated by plants of the family solanaceae, including atropa, hyoscyamus, mandragora, nicotiana, solanum, etc. Some act as cholinergic antagonists; most are very toxic; many are used medicinally. (12 Dec 1998) |
| ergot alkaloids | Alkaloids isolated from the ergot fungus claviceps purpurea (hypocreaceae). The ergot alkaloids were the first alpha-adrenergic antagonists discovered, but side effects generally prevent their administration in doses that would produce more than a minimal blockade in humans. Their smooth muscle-stimulating activities may be attributed to alpha-agonistic properties, thus characterizing these alkaloids as a series of partial agonists. They have many clinical applications, notably in obstetrics and the treatment of migraine. (12 Dec 1998) |
| methylene | <chemistry> A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; formerly called also methene. <chemistry> Methylene blue, an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; called also pure blue. Origin: F. Methylene, from Gr. Wine + wood; a word coined to correspond to the name wood spirit. Source: Websters Dictionary (01 Mar 1998) |
| methylene azure | A mixture of azure A and B. Synonym: methylene azure. (05 Mar 2000) |
| methylene chloride | <chemical> Dichloromethane. A chlorinated hydrocarbon that has been used as an inhalation anaesthetic and acts as a narcotic in high concentrations. Its primary use is as a solvent in manufacturing and food technology. Chemical name: Methane, dichloro- (12 Dec 1998) |
| methylene tetrahydrofolate dehydrogenase-methenyltetrahydrofolate cyclohydrolase | <chemical> Bifunctional enzyme which contains mg-nad dependent covalently linked methylenetetrahydrofolate dehydrogenase (EC 1.5.1.15) and methenyltetrahydrofolate cyclohydrolase (EC 3.5.4.9); usually found in prokaryotes Synonym: methf dehydrogenase-cyclohydrolase (26 Jun 1999) |
| methylene white | The reduced and colourless form of methylene blue. Synonym: methylene white. (05 Mar 2000) |
| polyamine-methylene resin | A synthetic acid-binding resin used as a gastric antacid. (05 Mar 2000) |