| DA | dark adaptation; dark agouti [rat]; daunomycin; degenerative arthritis; delayed action; Dental Assis... |
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| ACTH | Adreno-Cortico-Tropic(=Tropin)(or steroid) Hormone |
| STH | Somato-Tropic Hormone |
| A [band] | the dark-staining zone of a striated muscle |
| DK | dark; decay; diabetic ketoacidosis; diet kitchen; diseased kidney; dog kidney [cells] |
| M-tropic | Macrophage tropic |
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| T-tropic | T cell line-tropic |
| T-tropic | T cell-tropic |
| D | Dark |
| DA | Dark Agouti |
| tanning | The art or process of converting skins into leather. See Tan. Source: Websters Dictionary (01 Mar 1998) |
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| tropic | 1. <suffix> A turning toward, having an affinity for. Compare: -trophic. Origin: G. Trope, a turning 2. <chemistry> Of, pertaining to, or designating, an acid obtained from atropine and certain other alkaloids, as a white crystalline substance slightly soluble in water. 3. <astronomy> One of the two small circles of the celestial sphere, situated on each side of the equator, at a distance of 23 deg 28 min, and parallel to it, which the sun just reaches at its greatest declination north or south, and from which it turns again toward the equator, the northern circle being called the Tropic of Cancer, and the southern the Tropic of Capricorn, from the names of the two signs at which they touch the ecliptic. 4. <geography> One of the two parallels of terrestrial latitude corresponding to the celestial tropics, and called by the same names. The region lying between these parallels of latitude, or near them on either side. 5. <zoology> Tropic bird, any one of three species of oceanic belonging to the genus Phaethon, found chiefly in tropical seas. They are mostly white, and have two central tail feathers very long and slender. The yellow-billed tropic bird. Phaethon flavirostris (called also boatswain), is found on the Atlantic coast of America, and is common at the Bermudas, where it breeds. Origin: F. Tropique, L.tropicus of or belonging to a turn, i. E, of the sun, Gr. Of the solstice, (sc) the tropic or solstice, fr. To turn. See Trope. Source: Websters Dictionary (20 Jun 2000) |
| tropic acid | <chemical> A constituent of atropine and of scopolamine, in which it is esterified through its COOH to the 3-CHOH of tropine. Chemical name: alpha-phenylhydracrylic acid; 2-phenyl-3-hydroxypropionic acid Structure: HOCH2CH(C6H5)COOH Synonym: tropaic acid, tropeic acid. (05 Mar 2000) |
| tropic acid dehydrogenase | <enzyme> Catalyses nad-dependent conversion of tropic acid to phenylacetaldehyde via oxidative decarboxylation; isolated from pseudomonas Registry number: EC 1.1.1.- (26 Jun 1999) |
| tropic hormone | <endocrinology> A peptide hormone that stimulates a specific target gland to secrete adifferent set of hormones. (09 Oct 1997) |
| tropic hormones | Trophic hormones, those hormone's of the anterior lobe of the pituitary that affect the growth, nutrition, or function of other endocrine glands. (05 Mar 2000) |
| cardioid dark field condenser | <microscopy> A condenser designed with two reflecting surfaces, the first, a spherical surface which reflects the rays to a second, cardioid (heart-shaped) surface. The virtue in such an arrangement is that, if the cardioid surface is of true figure, the lens is both achromatic and aplanatic. It has a limiting numerical aperture of about 1.0. Thus objectives of a greater numerical aperture cannot be used successfully with it. A true cardioid figure is the trace of a point on the circumference of a circle rolling around an equal, fixed circle. (05 Aug 1998) |
| paraboloid dark field condenser | <microscopy> A lens of parabolic shape. The vertex end is ground back so that its focus can be brought into coincidence with the specimen on the slide. A central stop is provided to block the central rays. It is used chiefly for medium- power work. (05 Aug 1998) |
| condenser, dark field | <microscopy> A condenser forming a hollow cone of light with its apex (or focal point) in the plane of the specimen. When used with an objective having a numerical aperture lower than the minimum numerical aperture of the hollow cone, only light deviated by the specimen enters the objective. Objects are seen as bright images against a dark background. The ordinary bright field condenser of low power, used with a central stop, makes a good dark field condenser. They all form a dark field while illuminating the specimen with a hollow cone of light. The lower limiting aperture of the condenser must be greater than the numerical aperture of the objective with which it is to be used. Thus, no direct light enters the objective, the specimen is seen by reflected or scattered light on a dark background. See: condensers See: special dark field condensers: paraboloid, cardioid and Cassegrainian. (05 Aug 1998) |
| dark adaptation | The adjustment of the eye occurring under reduced illumination in which the sensitivity to light is greatly increased or the light threshold is greatly reduced. Dark adaptation is slower than light adaptation. During dark adaptation rhodopsin is built up in the retinal rods. (12 Dec 1998) |
| dark-adapted eye | An eye that has been in darkness or semidarkness and has undergone regeneration of rhodopsin (visual purple), which renders it more sensitive to reduced illumination. Synonym: scotopic eye. (05 Mar 2000) |
| dark cell | Cell's in eccrine sweat glands having many ribosomes and mucoid secretory granules. (05 Mar 2000) |
| dark current | <physiology> Current caused by constant influx of sodium ions into the rod outer segment of retinal photoreceptors and that is blocked by light (leading to hyperpolarization). The plasma membrane sodium channel is controlled through a cascade of amplification reactions initiated by photon capture by rhodopsin in the disc membrane. (18 Nov 1997) |
| dark-field condenser | An apparatus for throwing reflected light through the microscope field, so that only the object to be examined is illuminated, the field itself being dark. (05 Mar 2000) |
| dark field illumination | <microscopy> Any method of illumination which illuminates the specimen but does not admit light directly to the objective. It may be by substage (dark field) condensers, by stagespot lighting, by special condensers fitted around special objectives for reflected illumination or by the slit ultramicroscope. (05 Aug 1998) |
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