| chlorometry | The measurement of chlorine content, or the use of analytical techniques involving the release or titration of chlorine. (05 Mar 2000) |
|---|---|
| chloromuconate cycloisomerase | <enzyme> Converts 2-chloro-5-oxo-2,5-dihydrofuran-2-acetate to 3-chloro-cis,cis-muconate, which spontaneously eliminates hcl to produce cis-4-carboxymethylbut-2-en-4-olide Registry number: EC 5.5.1.7 Synonym: muconate cycloisomerase II (26 Jun 1999) |
| chloromyeloma | Synonym: chloroma. Origin: chloro-+ G. Myelos, marrow, + -oma, tumour (05 Mar 2000) |
| chloropenia | A deficiency in chloride. Origin: chloro-+ G. Penia, poverty (05 Mar 2000) |
| chloropercha | A solution of gutta-percha in chloroform, used in dentistry as an agent to lute gutta-percha filling material to the wall of a prepared root canal. (05 Mar 2000) |
| chloropercha method | A method of filling the root canals of teeth by dissolving gutta-percha cones in a chloroform-rosin medium within the root canal. Synonym: Callahan's method, Johnson's method. (05 Mar 2000) |
| chlorophenol | One of several substitution products obtained by the action of chlorine on phenol; used as antiseptics. (05 Mar 2000) |
| chlorophenol 4-monooxygenase | <enzyme> Enzyme responsible for converting 2,4,5-trichlorophenol to 2,5-dichloro-p-hydroquinone and then to 5-chloro-1,2,4-trihydroxybenzene (5-chlorohydroxyquinol); from burkholderia cepacia ac1100 Registry number: EC 1.14.- (26 Jun 1999) |
| chlorophenols | Phenols substituted with one or more chlorine atoms in any position. (12 Dec 1998) |
| chlorophenothane | 1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane;an insecticide that came into prominence during and after World War II. For a time it proved very effective, but insect populations rapidly developed tolerance for it, hence much of its original effectiveness has been lost; general usage is now widely discouraged because of the toxicity that results from the environmental persistence of this agent. Synonym: chlorophenothane, dicophane. Acronym: DDT (05 Mar 2000) |
| chlorophyll | The photosynthetic pigments of higher plants, but closely related to bacteriochlorophylls. Magnesium complexes of tetrapyrolles. (18 Nov 1997) |
| chlorophyll a | Magnesium(II) pheophytinate a [(pheophytina to a)magnesium(II)];the major pigment found in all oxygen-evolving photosynthetic organisms (higher plants, and red and green algae). (05 Mar 2000) |
| chlorophyll b | (CH3 at 7 replaced by CHO in the chlorophyll structure), magnesium(II) pheophytinate b [(pheophytinato b) magnesium(II)]; the chlorophyll generally characteristic of higher plants (including the Chlorophyta, Euglenaphyta, and green algae). Absent in other types of algae. (05 Mar 2000) |
| chlorophyll b reductase | <enzyme> Reduces the 7-formyl group of chlorophyll b to the 7'-hydroxy compound; requires NADPH or NADH; NADPH is more effective Registry number: EC 1.1.1.- Synonym: chlorophyllide b reductase (26 Jun 1999) |
| chlorophyll c | The chlorophyll present in brown algae, diatoms, and flagellates. Two variants are known: c 1, in which two hydrogens are lost from C-17 and C-18, thus resembling phytoporphyrin, and the side chain at C-17 becomes an acrylic residue, -CH==CH2COOH; c2, in which the same changes are noted, but two more hydrogens are lost from the ethyl group at C-8, making this a vinyl residue like that at C-3. The two compounds can thus be named in terms of phytoporphyrin: magnesium 31,32,171,172-tetradehydro-132-(methoxycarbonyl)phytoporphyrinate and magnesium 31,32,81,82,171,172-hexadehydro-132-(methoxycarbonyl)phytoporphyrinate. Synonym: chlorofucin. (05 Mar 2000) |