| c | <radiobiology> Speed of light, 3.0x10E+8 metres/second or 3.0x10E+10 cm/sec (09 Oct 1997) |
|---|---|
| C banding | <molecular biology> Method of defining chromosome structure by staining with Giemsa and looking at the banding pattern in the heterochromatin of the centromeric regions. Giemsa banding (G banding) of the whole chromosome gives higher resolution. Q banding is done with quinacrine. (18 Nov 1997) |
| C carbohydrate antigen | An antigen found in the cell wall of Streptococcus pneumoniae. See: beta-haemolytic streptococci. (05 Mar 2000) |
| C cell | A cell of the pancreatic islets of the guinea pig. Synonym: gamma cell of pancreas. Synonym: parafollicular cells. (05 Mar 2000) |
| C chain | <protein> C-peptide is a byproduct of normal insulin production by the beta cells in the pancreas. Normal values are 0.5 to 3.0 ng/ml. Normal levels indicate that the body is still producing its own insulin. Low levels indicate that the pancreas is producing little or no insulin. Elevations can be seen in cases of insulinomas and islet of Langerhans tumours. (27 Sep 1997) |
| C factors | Proteins that restore phosphorylating ability to mitochondria that have lost it, i.e., have become "uncoupled" so that oxidation and electron transport no longer produces ATP. Usually termed coupling factor F1, F2, etc. Synonym: C factors. (05 Mar 2000) |
| C fibres | Unmyelinated fibre's, 0.4 to 1.2 um in diameter, conducting nerve impulses at a velocity of 0.7 to 2.3 m/sec. (05 Mar 2000) |
| C gene | The gene coding for the constant regions of immunoglobulin chains. (05 Mar 2000) |
| C group viruses | A serologic group of the genus Bunyavirus (formerly called group C arboviruses), composed of 12 species including Caraparu, Murutucu, and Oriboca virus. (05 Mar 2000) |
| C polysaccharide | <microbiology> Polysaccharide released by pneumococci which contains galactosamine 6 phosphate and phosphoryl choline. C-reactive protein is so called because it will precipitate this polysaccharide through an interaction with the phosphoryl choline. (18 Nov 1997) |
| C protein | <cell biology> Striated muscle thick filament associated proteins (140-150 kD) that show up in the C zone of the A band as 43nm transverse stripes. Structurally related to various other myosin binding proteins (twitchin, titin, myosin light chain kinase, skelemin, 86 kD protein, projectin, M protein). (18 Nov 1997) |
| C region | <immunology> The parts of the heavy or light chains of immunoglobulin molecules that are of constant sequence, in contrast to variable or V regions. The constancy of sequence is relative because there are several constant region genes and alleles thereof (see allotypes), but within one animal homozygous at the light and heavy chain constant region genes all immunoglobulin molecules of any one class have constant sequences in their C regions. The constant region sequences for the various different types of immunoglobulin for example IgG, IgA, etc. Will vary. (18 Nov 1997) |
| C sliding osteotomy | An extraoral osteotomy in the shape of a "C" performed bilaterally in the mandibular rami for the correction of retrognathia and/or apertognathia. (05 Mar 2000) |
| c strand | <molecular biology> An abbreviation for the term complementary strand used of nucleic acids. (18 Nov 1997) |
| C subfibre | <cell biology> The third partial microtubule associated with the A and B tubules of the outer axonemal doublets in the basal body and in the centriole) to form a triplet structure. (18 Nov 1997) |