| zea | <botany> A genus of large grasses of which the Indian corn (Zea Mays) is the only species known. Its origin is not yet ascertained. See Maize. Origin: L, a kind of grain, fr. Gr,; cf. Skr. Yava barley. Source: Websters Dictionary (01 Mar 1998) |
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| zealotry | The character and behavior of a zealot; excess of zeal; fanatical devotion to a cause. "Enthusiasm, visionariness, seems the tendency of the German; zeal, zealotry, of the English; fanaticism, of the French." (Coleridge) Source: Websters Dictionary (01 Mar 1998) |
| zearalenone | <chemical> (s-(e))-3,4,5,6,8,10-hexahydro-14,16-dihydroxy-3-methyl-1h-2-benzoxacyclotetradecin-1,7(8h)-dione. One of a group of compounds known under the general designation of resorcylic acid lactones. Cis, trans, dextro and levo forms have been isolated from the fungus gibberella zeae (formerly fusarium graminearum). They have oestrogenic activity, cause toxicity in livestock as feed contaminant, and have been used as anabolic or oestrogen substitutes. Pharmacological action: oestrogens, non-steroidal. Chemical name: 1H-2-Benzoxacyclotetradecin-1,7(8H)-dione, 3,4,5,6,9,10-hexahydro-14,16-dihydroxy-3-methyl-, (S-(E))- (12 Dec 1998) |
| zeatin | <molecular biology, plant biology> A naturally occurring cytokinin, originally isolated from maize seeds. Its riboside is also a cytokinin. (18 Nov 1997) |
| zeaxanthin | B,beta-carotene-3,3'-diol;a carotene found in corn, fruits, seeds, and egg yolk; isomeric with xanthophyll. Synonym: zeaxanthol. Origin: Mod. L. Zea, Indian corn, fr. L. Zea, grain + G. Xanthos, yellow, + -in (05 Mar 2000) |
| zeaxanthin epoxidase | <enzyme> An o2-dependent NADPH-dependent epoxidase; catalyses the epoxidation of zeaxanthin to violaxanthin via antheraxanthin; active at the stromal side of the thylakoids of green plants Registry number: EC 1.- Synonym: zea-epoxidase (26 Jun 1999) |
| zeaxanthin glucosyltransferase | <enzyme> Forms zeaxanthin monoglucoside and diglucoside; isolated from erwinia herbicola Registry number: EC 2.4.1.- Synonym: crtx gene product, 3-hydroxy-beta-carotene glycosylase (26 Jun 1999) |
| zeaxanthol | B,beta-carotene-3,3'-diol;a carotene found in corn, fruits, seeds, and egg yolk; isomeric with xanthophyll. Synonym: zeaxanthol. Origin: Mod. L. Zea, Indian corn, fr. L. Zea, grain + G. Xanthos, yellow, + -in (05 Mar 2000) |