| Zinn's vascular circle | <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve. Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle. (05 Mar 2000) |
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| Zinn's zonule | A series of delicate meridional fibres arising from the inner surface of the orbiculus ciliaris that run in bundles between, and in a very thin layer over, the ciliary processes; at the inner border of the corona, the fibres diverge into two groups that are attached to the capsule on the anterior and posterior surfaces of the lens close to the equator; the spaces between these two layers of fibres are filled with aqueous humor. Synonym: zonula ciliaris, apparatus suspensorius lentis, suspensory ligament of lens, Zinn's zonule. (05 Mar 2000) |
| Zinn, Johann | <person> German anatomist, 1727-1759. See: Zinn's artery, Zinn's vascular circle, Zinn's corona, Zinn's ligament, Zinn's membrane, Zinn's ring, Zinn's tendon, Zinn's zonule. (05 Mar 2000) |
| zinnia | <botany> Any plant of the composite genus Zinnia, Mexican herbs with opposite leaves and large gay-coloured blossoms. Zinnia elegans is the commonest species in cultivation. Origin: NL. So called after Professor Zinn, of Gottingen. Source: Websters Dictionary (01 Mar 1998) |
| zinnwaldite | <chemical> A kind of mica containing lithium, often associated with tin ore. Origin: So called after Zinnwald, in Bohemia, where it occurs. Source: Websters Dictionary (01 Mar 1998) |
| zinostatin | <chemical> An antitumour isolate from the culture filtrate of the f-41 variant of streptomyces carzinostaticus. It is a protein of known amino acid sequence with a molecular weight of approximately 11,500 and possessing a regulatory function on the metabolism of DNA. In this process, that is first an inhibition of DNA biosynthesis followed by the degradation of DNA, zinostatin functions in a manner analogous to that of the much higher molecular weight antibiotic mitomycin c. Zinostatin is also a potent cytostatic agent active against gram-positive organisms. Pharmacological action: antibiotics, antineoplastic, nucleic acid synthesis inhibitors. Chemical name: Neocarzinostatin (12 Dec 1998) |
| zinsang | <zoology> The delundung. Source: Websters Dictionary (01 Mar 1998) |
| zinsser | See Brill-Zinsser disease (recrudescent epidemic typhus). (12 Dec 1998) |
| Zinsser, Hans | <person> U.S. Bacteriologist and immunologist, 1878-1940. See: Brill-Zinsser disease. (05 Mar 2000) |
| zinziberaceous | <botany> Same as Zingiberaceous. Source: Websters Dictionary (01 Mar 1998) |
| ziphioid | <zoology> See Xiphioid. Source: Websters Dictionary (01 Mar 1998) |
| zipper | <molecular biology> Motif found in certain DNA binding proteins. In a region of approximately 35 amino acids, every seventh is a leucine. This facilitates dimerisation of two such proteins to form a functional transcription factor. Examples of proteins containing leucine zippers are products of the proto-oncogenes myc, fos and jun. (15 Oct 1997) |
| zipper protein kinase | <enzyme> A putative serine/threonine protein kinase of 859 amino acids; has a leucine-zipper domain; has been sequenced; genbank u07358 Registry number: EC 2.7.10.- Synonym: zpk protein, leucine-zipper protein kinase (26 Jun 1999) |
| zippering | <cell biology> Process suggested to occur in phagocytosis in which the membrane of the phagocyte covers the particle by a progressive adhesive interaction. The evidence for such a mechanism comes from experiments in which capped B-cells are only partially internalised, whereas those with a uniform opsonising coat of antiIgG are fully engulfed. (18 Nov 1997) |
| ziram | <chemical> (t-4)-bis(dimethylcarbamodithioato-s,s')zinc. An industrial fungicide with low mammalian toxicity, although it does possess an irritant capacity for skin and mucous membranes. Pharmacological action: fungicides, industrial. Chemical name: Zinc, bis(dimethylcarbamodithioato-S,S')-, (T-4)- (12 Dec 1998) |