zonary placenta |
A placenta in the form of a band encircling the interior of the uterus. Synonym: zonary placenta. (05 Mar 2000) |
|---|---|
zonate |
<botany> Divided by parallel planes; as, zonate tetraspores, found in certain red algae. Source: Websters Dictionary (01 Mar 1998) |
Zondek, Bernhardt |
<person> German obstetrician and gynecologist, 1891-1966. See: Aschheim-Zondek test. (05 Mar 2000) |
Zondek-Aschheim test |
An obsolete test for pregnancy; repeated injections of small quantities of urine voided during the first months of pregnancy produce in infantile mice, within 100 hours, minute intrafollicular ovarian haemorrhages, and the development of lutein cells. Synonym: A.-Z. Test, Zondek-Aschheim test. (05 Mar 2000) |
zone |
1. A girdle; a cincture. "An embroidered zone surrounds her waist." (Dryden) "Loose were her tresses seen, her zone unbound." (Collins) 2. <geography> One of the five great divisions of the earth, with respect to latitude and temperature. The zones are five: the torrid zone, extending from tropic to tropic 46 deg 56 min, or 23 deg 28 min on each side of the equator; two temperate or variable zones, situated between the tropics and the polar circles; and two frigid zones, situated between the polar circles and the poles. "Commerce . . . Defies every wind, outrides every tempest, and invades." (Bancroft) 3. <mathematics> The portion of the surface of a sphere included between two parallel planes; the portion of a surface of revolution included between two planes perpendicular to the axis. 4. A band or stripe extending around a body. A band or area of growth encircling anything; as, a zone of evergreens on a mountain; the zone of animal or vegetable life in the ocean around an island or a continent; the Alpine zone, that part of mountains which is above the limit of tree growth. 5. <chemistry> A series of planes having mutually parallel intersections. 6. Circuit; circumference. Abyssal zone. To girdle; to encircle. <physics> A straight line passing through the center of a crystal, to which all the planes of a given zone are parallel. Origin: F. Zone, L. Zona, Gr.; akin to to gird, Lith. Jsta to gird, Zend yah. Source: Websters Dictionary (01 Mar 1998) |
zone 1, 2, 3, 4 of West |
In pulmonary physiology, defines the levels in a vertical lung according to the relationships of alveolar gas pressure, capillary blood pressure, and pulmonary venous pressure. (05 Mar 2000) |
zone centrifugation |
<technique> High-speed centrifugation inwhich molecules float at a point wheretheir density equals that in a gradient of cesium chloride or sucrose. (12 Jan 1998) |
zone electrophoresis |
<chemistry, procedure> A type of electrophoresis used by physical chemists. In it, the components of a mixture are separated into distinct zones by moving the solution through a porous medium such as filter paper. (06 May 1997) |
zone of inhibition |
<microbiology> The area of no bacterial browth around an antimicrobial agent in the disk-diffusion test. (09 Oct 1997) |
zone of optimal proportion |
<chemistry> A zone in a solution of mixed antigen in which the two biomolecules are totally combined. (11 May 1997) |
zone of polarizing activity |
<cell biology> The small group of mesenchyme cells in avian limb buds that is located at the posterior margin of the developing bud and that produces a substance, possibly retinoic acid, that provides positional information to the developing limb bud. (18 Nov 1997) |
zoned |
1. Wearing a zone, or girdle. 2. Having zones, or concentric bands; striped. 3. <botany> Zonate. Source: Websters Dictionary (01 Mar 1998) |
zones of discontinuity |
Concentric zone's of varying optical density in the lens of the eye, as seen in slitlamp biomicroscopy. (05 Mar 2000) |
zonesthesia |
A sensation as if a cord were drawn around the body, constricting it. Synonym: cincture sensation, girdle sensation, strangalesthesia. Origin: G. Zone, girdle, + aisthesis, sensation (05 Mar 2000) |
zonifugal |
Passing from within any region outward; as in mapping out an area of disturbed sensation, when the stimulus is first applied to the affected region and is carried into the area where sensation is normal. Origin: L. Zona, zone, + fugio, to flee (05 Mar 2000) |