| vascular-streak dieback | A fungal disease of the cacaotree caused by Oncobasidium theobromae. (09 Oct 1997) |
|---|---|
| germinal streak | An ectodermal ridge in the midline at the caudal end of the embryonic disk from which arises the intraembryonic mesoderm; achieved by inward and then lateral migration of cells; in human embryos, it appears on day 15 and gives a cephalocaudal axis to the developing embryo. Synonym: germinal streak. (05 Mar 2000) |
| gonadal streak | A form of aplasia in which the ovary is replaced by a functionless tissue, as found in Turner's syndrome. Synonym: streak gonad. (05 Mar 2000) |
| meningitic streak | A line of redness resulting from drawing a point across the skin, especially notable in cases of meningitis. Synonym: tache cerebrale, tache meningeale, Trousseau's spot. (05 Mar 2000) |
| primitive streak | An ectodermal ridge in the midline at the caudal end of the embryonic disk from which arises the intraembryonic mesoderm; achieved by inward and then lateral migration of cells; in human embryos, it appears on day 15 and gives a cephalocaudal axis to the developing embryo. Synonym: germinal streak. (05 Mar 2000) |
| streak | 1. A line or long mark of a different colour from the ground; a stripe; a vein. "What mean those coloured streaks in heaven?" (Milton) 2. A strake. 3. <chemical> The fine powder or mark yielded by a mineral when scratched or rubbed against a harder surface, the colour of which is sometimes a distinguishing character. 4. The rung or round of a ladder. Origin: OE. Streke; akin to D. Streek a line, stroke, G. Strich, AS. Strica, Sw. Strek, Dan. Streg, Goth. Stricks, and E. Strike, stroke. See Strike, Stroke, and cf. Strake. Source: Websters Dictionary (01 Mar 1998) |
| streak culture | A culture produced by lightly stroking an inoculating needle or loop with inoculum over the surface of a solid medium. (05 Mar 2000) |
| streak gonad | A form of aplasia in which the ovary is replaced by a functionless tissue, as found in Turner's syndrome. Synonym: streak gonad. (05 Mar 2000) |
| streak hyperostosis | A hypertrophying and condensing osteitis which tends to run in longitudinal streaks or columns, like wax drippings on a candle, and which involves a number of the long bones. Synonym: flowing hyperostosis, streak hyperostosis. Origin: rheo-+ G. Osteon, bone, + -osis, condition (05 Mar 2000) |
| fatty streak | <pathology> Superficial fatty patch in the artery wall caused by the accumulation of cholesterol and cholesterol oleate in distended foam cells. (18 Nov 1997) |
| agar | <cell culture, chemical, microbiology> This gelatinous material, an extract from red algae (mainly Gelidium and Gracilaria species), is most frequently used as a culture medium, especially for bacteria. It is also used as a thickener in foods, but humans cannot digest it. (06 May 1997) |
| agar-gel reaction | <immunology> The reaction between an antibody and an antigen during an immunology lab procedure where the two are allowed to diffuse toward each other through an agar-gel medium. Lines of precipitation form in the places on the gel where the two react with each other and shows where the reaction has occurred. (09 Oct 1997) |
| ascitic agar | A form of serum agar. (05 Mar 2000) |
| bile salt agar | An agar medium containing lactose, peptone, sodium taurocholate, and neutral red, for the growth and isolation of Gram-negative rods. (05 Mar 2000) |
| birdseed agar | Media prepared from Guizottia abyssinica seeds used in culturing and in the presumptive diagnosis of Cryptococcus neoformans. (05 Mar 2000) |