| siv | Species of the genus lentivirus, subgenus primate immunodeficiency viruses (immunodeficiency viruses, primate), that induces acquired immunodeficiency syndrome in monkeys and apes (saids). The genetic organization of siv is virtually identical to HIV. Siv is 50% homologous in nucleotide sequence to HIV-1. Siv and HIV-2 exhibit close structural and immunologic properties and are 75% homologous. Siv does not cause immune deficiency in its natural host, the african green monkey, but does produce saids in the rhesus macaque. Subgroups of siv include siv-1 and siv-2. (12 Dec 1998) |
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| SIV(mac) proteinase | <enzyme> From macaque simian immunodeficiency virus; has 80% homology with hiv protease Registry number: EC 3.4.23.- Synonym: siv mac proteinase, sivmac proteinase siv protease (26 Jun 1999) |
| siva | One of the triad of Hindoo gods. He is the avenger or destroyer, and in modern worship symbolizes the reproductive power of nature. Origin: Skr. Civa, properly, kind, gracious. Source: Websters Dictionary (01 Mar 1998) |
| sivatherium | <paleontology> A genus of very large extinct ruminants found in the Tertiary formation of India. The snout was prolonged in the form of a proboscis. The male had four horns, the posterior pair being large and branched. It was allied to the antelopes, but very much larger than any exsisting species. Origin: NL, from E. Siva + Gr. A beast, an animal. Source: Websters Dictionary (01 Mar 1998) |
| sivvens | <medicine> See Sibbens. Source: Websters Dictionary (01 Mar 1998) |