| spermidine acetyltransferase | <enzyme> Involved in conversion of spermidine into putrescine; csat refers to n1-acetyltransferse; nsat refers to n8-acetyltransferase Registry number: EC 2.3.1.57 Synonym: spermidine-spermine n(1)-acetyltransferase, diamine acetyltransferase, csat transferase, nsat transferase, spermidine n(8)-acetyltransferase, spermidine n1-acetyltransferase, spermidine n8-acetyltransferase, putrescine n-acetyltransferase (26 Jun 1999) |
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| spermidine synthase | <enzyme> An enzyme that catalyses the transfer of the propylamine moiety from 5'-deoxy-5'-s-(3-methylthiopropylamine)sulfonium adenosine to putrescine in the biosynthesis of spermidine. The enzyme has a molecular weight of approximately 73,000 kD and is composed of two subunits of equal size. Chemical name: S-Adenosylmethioninamine:putrescine 3-aminopropyltransferase Registry number: EC 2.5.1.16 (12 Dec 1998) |
| spermidium | Origin: Nl, fr. Gr. Seed. <botany> An achenium. Source: Websters Dictionary (01 Mar 1998) |
| spermiduct | Synonym: ductus deferens. Synonym: ejaculatory duct. (05 Mar 2000) |
| 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) |
| 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) |
| speciation |
The origin of a new species.
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| spermarche |
A boy
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| spermicide |
A sperm-killing chemical agent. 375
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| spectroscope |
An apparatus to effect dispersion of radiation and visual display of the spectrum obtained.
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| spectroscopy |
The study of the interaction between matter and radiation. Since the energy levels in all atoms and molecules are discrete (quantized), the absorption or emission of radiation occurs at distinct energies (frequencies) characteristic of a given chemical. The energy levels probed may be rotational (microwave region), vibrational (infrared region), or electronic (visible or ultraviolet). ...
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| SPE | someone who risks losses for the possibility of considerable gains |
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| SPE | someone who makes conjectures without knowing the facts |
| SPE | a medical instrument for dilating a bodily passage or cavity in order to examine the interior |
| SPE | a mirror (especially one made of polished metal) for use in an optical instrument |
| SPE | the mental faculty or power of vocal communication |
| SPE | a lengthy rebuke |
| SPE | words making up the dialogue of a play |
| SPE | your characteristic style or manner of expressing yourself orally |
| SPE | communication by word of mouth |
| SPE | the exchange of spoken words |
| SPE | something spoken |
| SPE | the act of delivering a formal spoken communication to an audience |