| sex hormone | <endocrinology> Hormone that is secreted by gonads or that influences gonadal development. Examples are oestrogen, testosterone, gonadotrophins. (18 Nov 1997) |
|---|---|
| sex hormone-binding globulin | A glycoprotein migrating as a beta-globulin. Its molecular weight, 52,000 or 95,000-115,000, indicates that it exists as a dimer. The protein binds testosterone, dihydrotestosterone, and estradiol in the plasma. Changes in its concentration significantly affect the ratio of unbound (biologically active) testosterone to estradiol in plasma. (12 Dec 1998) |
| sex hormones | Hormones having oestrogenic (female sex hormones) or androgenic (male sex hormones) activity. (12 Dec 1998) |
| sex-influenced | Denoting a class of genetic disorders in which the same genotype has differing manifestations in the two sexes; the variation may be rational (e.g., breast cancer occurs less frequently in males) or have only empirical support (e.g., pattern baldness behaves as a dominant trait in the male and as a recessive trait in the female). See: sex-influenced inheritance. (05 Mar 2000) |
| sex-influenced esterase | <enzyme> Sex hormone-dependent enzyme; liver enzyme may be a precursor of sex-influenced esterase Registry number: EC 3.1.1.- Synonym: es-si esterase, liver sex-influenced esterase (26 Jun 1999) |
| sex-influenced inheritance | Inheritance that is autosomal but has a different intensity of xpression in the two sexes, e.g., male pattern baldness. (05 Mar 2000) |
| sex-limited | Occurring in one sex only. See: sex-limited inheritance. (05 Mar 2000) |
| sex-limited inheritance | Inheritance of a trait that can be expressed in one sex only, e.g., testicular feminization. (05 Mar 2000) |
| sex manuals | Books used for sex education and procedural instruction. (12 Dec 1998) |
| sex maturation | Achievement of full sexual capacity. Applies to animals and humans. (12 Dec 1998) |
| sex offenses | Any violation of established legal or moral codes in respect to sexual behaviour. (12 Dec 1998) |
| sex pili | <cell biology> Fine filamentous projections (pili) on the surface of a bacterium that are important in conjugation. Often seem to be coded for by plasmids that confer conjugative potential on the host, in the case of the f plasmid, the F pili are 8-9nm diameter and several microns long, composed of pilin. Whether the pili merely serve to establish and maintain adhesive contact between the partners in conjugation or whether DNA is actually transferred through the central core of the pilus is still unresolved, although a simple adhesion role is more generally accepted. (18 Nov 1997) |
| sex preselection | Methods for control of genetic sex of offspring. (12 Dec 1998) |
| sex ratio | The number of males per 100 females. (12 Dec 1998) |
| sex reversal | A process whereby the sexual identity of an individual is changed from one sex to the other (e.g., by a combination of surgical, pharmacologic, and psychiatric procedures); it may also occur in the life history of pseudohermaphroditic individuals whose sex at birth was uncertain; initially reared as members of one gender or sex role, such individuals may, upon subsequent medical examination and advice, be reared thereafter as members of the opposite gender or sex role. (05 Mar 2000) |