| 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) |
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| 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) |
| chlorophyll d | -CH==CH2 replaced by -CO-CH3 in the chlorophyll structure;the chlorophyll found in red algae (Rhodophyceae), together with chlorophyll a. (05 Mar 2000) |
| chlorophyll esterase | A reversible hydrolyzing enzyme catalyzing the removal of the phytyl group from a chlorophyll, leaving a chlorophyllide. Synonym: chlorophyll esterase. (05 Mar 2000) |
| chlorophyll synthetase | <enzyme> Incorporates geranylgeraniol into chlorophyll; requires ATP; as of 11/80 not clear whether this is a synthetase or a combination of a kinase and a transferase Registry number: EC 6.1.- (26 Jun 1999) |
| chlorophyll unit | The number of chlorophyll molecules required to reduce one molecule of carbon dioxide by photosynthesis. (05 Mar 2000) |
| chlorophyllase | A reversible hydrolyzing enzyme catalyzing the removal of the phytyl group from a chlorophyll, leaving a chlorophyllide. Synonym: chlorophyll esterase. (05 Mar 2000) |
| chlorophyllide | That which remains of a chlorophyll molecule when the phytyl group is removed. (05 Mar 2000) |
| chlorophyllides | Products of the hydrolysis of chlorophylls in which the phytic acid side chain has been removed and the carboxylic acids saponified. (12 Dec 1998) |
| Chlorophyta | <botany> Division of algae containing photosynthetic pigments similar to those in higher plants and having a green colour. Includes unicellular forms, filaments and leaf like thalluses (e.g. Ulva). Some members form coenobia and the Characean algae have branched filaments. (18 Nov 1997) |
| chloropicrin | CCl3NO2; trichloronitromethane;a toxic lung irritant and lacrimatory gas; it also causes vomiting, colic, and diarrhoea, and therefore is called vomiting gas. Synonym: nitrochloroform. (05 Mar 2000) |
| chloroplast | Photosynthetic organelle of higher plants. Lens shaped and rather variable in size but approximately 5m long. Surrounded by a double membrane and contains circular DNA though not enough to code for all proteins in the chloroplast). Like the mitochondrion, it is semi autonomous. It resembles a cyanobacterium from which, on the endosymbiont hypothesis, it might be derived. The photosynthetic pigment, chlorophyll, is associated with the membrane of vesicles (thylakoids) that are stacked to form grana. (18 Nov 1997) |
| chloroplast DNA | <molecular biology> A circular molecule of DNA found in all photosynthetic plants which codes for the function of photosynthesis. (09 Oct 1997) |
| chloroplasts | Plant cell inclusion bodies that contain chlorophyll. They occur in cells of leaves and young stems. (12 Dec 1998) |
| chloroprednisone | 6a-Chloro-17,21-dihydroxypregna-1,4-diene-3,11,20-tr ione;a topical anti-inflammatory agent. (05 Mar 2000) |