| spermine | <biochemistry> Polybasic amine. Found in human sperm, in ribosomes and in some viruses. Involved in nucleic acid packaging. Synthesis is regulated by ornithine decarboxylase which plays a key role in control of DNA replication. (18 Nov 1997) |
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| spermine synthase | <enzyme> An enzyme that catalyses the transfer of the propylamine moiety from 5'-deoxy-5'-s-(3-methylthiopropylamine)sulfonium adenosine to spermidine in the biosynthesis of spermine. It has an acidic isoelectric point at pH 5.0. Chemical name: S-Adenosylmethioninamine:spermidine 3-aminopropyltransferase Registry number: EC 2.5.1.22 (12 Dec 1998) |
| spermiogenesis | That segment of spermatogenesis during which immature spermatids become spermatozoa. Origin: sperm-+ G. Genesis, origin (05 Mar 2000) |
| spermism | The belief by preformationists that the male sex cell (sperm) contains a miniature preformed body called the homunculus. (05 Mar 2000) |
| spermist | <biology> A believer in the doctrine, formerly current, of encasement in the male (see Encasement), in which the seminal thread, or spermatozoid, was considered as the real animal germ, the head being the true animal head and the tail the body. Source: Websters Dictionary (01 Mar 1998) |
| spermium | H.W.G. Waldeyer's term for the mature male germ cell or spermatozoon. (05 Mar 2000) |
| spermo- | <prefix> Combining forms from the Greek seed, sperm, semen (of plants or animals); as, spermatoblast, spermoblast. (29 Oct 1998) |
| spermoblast | <physiology> One of the cells formed by the diivision of the spermospore, each of which is destined to become a spermatozoid; a spermatocyte; a spermatoblast. Source: Websters Dictionary (01 Mar 1998) |
| spermococcus | <physiology> The nucleus of the sperm cell. Origin: NL. See Spermo-, and Coccus. Source: Websters Dictionary (01 Mar 1998) |
| spermoderm | <botany> The covering of a seed; sometimes limited to the outer coat or testa. Origin: Spermo- + derm: cf. F. Spermoderme. Source: Websters Dictionary (01 Mar 1998) |
| spermogonium | <botany> A conceptacle of certain lichens, which contains spermatia. Origin: NL.; spermo- + Gr. Offspring. Source: Websters Dictionary (01 Mar 1998) |
| spermolith | A concretion in the ductus deferens. Origin: spermo-+ G. Lithos, stone (05 Mar 2000) |
| spermologist | One who treats of, or collects, seeds. Origin: Gr. Picking up seeds; sperm, seed + to gather. Source: Websters Dictionary (01 Mar 1998) |
| spermolysis | Destruction, with dissolution, of the spermatozoa. Synonym: spermolysis. Origin: spermato-+ G. Lysis, dissolution (05 Mar 2000) |
| spermophile | <zoology> Any ground squirrel of the genus Spermophilus; gopher. Origin: Gr. A seed + loving, fond. Source: Websters Dictionary (01 Mar 1998) |
| spermatid |
One of the four cells formed by the meiotic divisions in spermatogenesis. Spermatids become mature spermatozoa (sperm).
출처: www.fao.org/docrep/003/X3910E/X3910E22.htm
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| spermatocyte |
Sperm mother cell. The cell that undergoes two meiotic divisions (spermatogenesis) to form four spermatids; the primary spermatocyte before completion of the first meiotic division; the secondary spermatocyte after completion of the first meiotic division.
출처: www.fao.org/docrep/003/X3910E/X3910E22.htm
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| spermatogenesis |
The series of cell divisions in the testis by which maturation of the gametes (sperm) of the male takes place.
출처: www.fao.org/docrep/003/X3910E/X3910E22.htm
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| spermatogonium |
(pl: spermatogonia) Primordial male germ cell that may divide by mitosis to produce more spermatogonia. A spermatogonium may enter a growth phase and give rise to a primary spermatocyte.
출처: www.fao.org/docrep/003/X3910E/X3910E22.htm
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| spermatozoon |
(pl: spermatozoa; abbr: sperm) The mature, mobile reproductive cell of male animals, produced by the testis.
출처: www.fao.org/docrep/003/X3910E/X3910E22.htm
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