| chromogranins | See: chromaffin tissue and granins. (18 Nov 1997) |
|---|---|
| chromoisomerism | Isomerism in which the isomers display different colours. (05 Mar 2000) |
| chromolipid | 1. A pigmented lipid, e.g., lutein, carotene. 2. A term sometimes used to designate the wear-and-tear pigments, e.g., lipofuscin, haemofuscin, ceroid. More precisely, lipochrome's are yellow pigments that seem to be identical to carotene and xanthophyll and are frequently found in the serum, skin, adrenal cortex, corpus luteum, and arteriosclerotic plaques, as well as in the liver, spleen, and adipose tissue; lipochrome's do not stain with the ordinary dyes for fat. 3. The pigment produced by certain bacteria. Synonym: chromolipid. Origin: Lipo-+ G. Chroma, colour (05 Mar 2000) |
| chromolysis | The disintegration of the granules of chromophil substance (Nissl bodies) in a nerve cell body which may occur after exhaustion of the cell or damage to its peripheral process; other changes considered part of chromatolysis include swelling of the perikaryon and shifting of the nucleus from its central position to the periphery. Synonym: chromatinolysis, chromolysis, tigrolysis. Origin: chromato-+ G. Lysis, dissolution Central chromatolysis, chromatolysis associated with significant axonal injury. Synonym: retrograde chromatolysis. (05 Mar 2000) |
| chromomere | Granular region of condensed chromatin. Used of chromosomes at leptotene and zygotene stages of meiosis, of the condensed regions at the base of loops on lampbrush chromosomes and of condensed bands in polytene chromosomes of Diptera. (18 Nov 1997) |
| chromometer | A device used to find out the concentration of particles suspended in a solution or a liquid medium by beaming light through it and measuring the amount of light that makes it out the other side. (The process is a part of the study of spectroscopy.) The device can be used to measure turbidity, or the amount of bacterial cells in a medium. The method of colourimetry is based on the Beer-Lambert Law. (09 Oct 1997) |
| chromomycin a3 | <chemical> Glycosidic antibiotic from streptomyces griseus used as a fluorescent stain of DNA and as an antineoplastic agent. Pharmacological action: antibiotics, antineoplastic, fluorescent dyes, nucleic acid synthesis inhibitors. Chemical name: Olivomycin D, 3D-O-(4-O-acetyl-2,6-dideoxy-3-C-methyl-alpha-L-arabino-hexopyranosyl)-7-methyl- (12 Dec 1998) |
| chromomycins | <chemical> A complex of several closely related glycosidic antibiotics from streptomyces griseus. The major component, chromomycin a3, is used as a fluorescent stain of DNA where it attaches and inhibits RNA synthesis. It is also used as an antineoplastic agent, especially for solid tumours. Pharmacological action: antibiotics, antineoplastic, nucleic acid synthesis inhibitors. (12 Dec 1998) |
| chromomycosis | Synonym: chromoblastomycosis. Origin: chromo-+ G. Mykes, fungus, + -osis, condition (05 Mar 2000) |
| chromonar | <chemical> [(3-(2-(diethylamino)-ethyl)-4-methyl-2-oxo-2h-1-benzopyran-7-yl)oxy]acetic acid ethyl ester. A coronary vasodilator agent. Pharmacological action: vasodilator agents. Chemical name: Acetic acid, ((3-(2-(diethylamino)ethyl)-4-methyl-2-oxo-2H-1-benzopyran-7-yl)oxy)-, ethyl ester (12 Dec 1998) |
| chromonar hydrochloride | [3-[2-(diethylamino)ethyl]-4-methyl-2-oxo-2H-1-benzopyran-7-yloxy] acetic acid ethyl ester hydrochloride;used as a coronary vasodilator for treatment of angina pectoris. (05 Mar 2000) |
| chromone | 4H-1-Benzopyran-4-one;fundamental unit of various plant pigments and other substances. See: flavone, chromene, chroman. (05 Mar 2000) |
| chromonema | The coiled filament in which the genes are located, which extends the entire length of a chromosome and exhibits an intensely positive Feulgen test for DNA. Synonym: chromatic fibre. Origin: chromo-+ G. Nema, thread (05 Mar 2000) |
| chromonychia | Abnormality in the colour of the nails. Origin: chromo-+ G. Onyx (onych-), nail (05 Mar 2000) |
| chromopectic | Relating to or causing chromatopexis. Synonym: chromopectic. (05 Mar 2000) |