| C1 esterase | The activated first component of complement (C1). (05 Mar 2000) |
|---|---|
| C1 esterase inhibitor | An a2-neuraminoglycoprotein that inhibits the enzymatic activity of C1 esterase, the activated first component of complement. A deficiency of this inhibitor results in a lack of inhibition of C1r and C1s leading to uncontrolled activation of the complement cascade and oedema. (05 Mar 2000) |
| C2 kinin | <biochemistry, protein> A kinin like fragment generated from complement C2, causes vasodilation and increased vascular permeability. Distinct from bradykinin. (07 Nov 1997) |
| c3 cycle | <biochemistry> The part of the photosynthesis process where carbon dioxide is converted into three-carbon compounds, which can then be turned into six-carbon sugars. (07 Nov 1997) |
| C3 plant | <plant biology> Plants that fix carbon dioxide in photosynthesis by the Calvin Benson cycle. The enzyme responsible for carbon dioxide fixation is RuDP carboxylase, whose products are compounds containing three carbon atoms. C3 plants are typical of temperate climates. Photorespiration in these plants is high. (07 Nov 1997) |
| C3 proactivator | <enzyme> A glycine-rich, heat-labile beta-glycoprotein found in blood. It is a proactivator of complement 3 in the alternate pathway of complement activation. Factor b is converted by factor d to c3 convertase. Registry number: EC 3.4.21.47 (12 Dec 1998) |
| C3 proactivator convertase | <enzyme> A serum protein which during the alternate pathway of complement activation converts the inactive properdin factor b to c3 convertase. Registry number: EC 3.4.21.46 (12 Dec 1998) |
| c4 cycle | <plant biology> An alternative, very efficient pathway used by plants living in areas with low levels of carbon dioxide, to convert carbon dioxide into a form usable by the plants during photosynthesis. (09 Oct 1997) |
| C4 plant | <plant biology> Plants found principally in hot climates whose initial fixation of carbon dioxide in photosynthesis is by the HSK pathway. The enzyme responsible is PEP carboxylase, whose products contain four carbon atoms. Subsequently the carbon dioxide is released and re fixed by the Calvin Benson cycle. The presence of the HSK pathway permits efficient photosynthesis at high light intensities and low carbon dioxide concentrations. most species of this type have little or no photorespiration. (21 Mar 1998) |
| C5a peptidase | <enzyme> Streptococcus pyogenes enzyme inactivates complement 5a by cleaving at lysine 68, removing a six-amino acid fragment Pharmacological action: complement inactivators Registry number: EC 3.4.99.- Synonym: streptococcus c5a peptidase, gbs c5a-ase, group b streptococci c5a-ase, scpa protein (26 Jun 1999) |
| c600 | <microbiology> A strain of the bacteria Escherichia coli which is used in genetics experiments as a host for foreign plasmids that have been cloned. (21 Mar 1998) |
| CA | <abbreviation> Carcinoma; cardiac arrest; cancer; chronologic age; cytosine arabinoside. 1. <abbreviation> Cathode. 2. Symbol for calcium. (05 Mar 2000) |
| CA 15-3 | <protein, tumour marker> Carbohydrate antigen elevated in patients with tumours of the breast, ovary, lung, and prostate as well as other disorders. The mucin is expressed normally by most glandular epithelia but shows particularly increased expression in the breast at lactation and in malignancy. It is thus an established serum marker for breast cancer. (12 Dec 1998) |
| CA 19-9 | <protein, tumour marker> Sialylated lewis blood group carbohydrate antigen found in many adenocarcinomas of the digestive tract, especially pancreatic tumours. (12 Dec 1998) |
| CA virus | <abbreviation> Croup-associated virus. (05 Mar 2000) |