| Km | <chemistry> A kinetic parameter used to characterise an enzyme, defined as the concentration of substrate that permits half maximal rate of reaction. An analogous constant Ka is used to describe binding reactions, in which case it is the concentration at which half the receptors are occupied. (17 Dec 1997) |
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| Km allotypes | Refers to human kappa immunoglobulin light chains that express different Km allotypic determinants (antigens). Synonym: InV allotypes. (05 Mar 2000) |
| Km antigen | Allotypic antigens that are present on human kappa immunoglobulin light chains. Synonym: InV group antigen. (05 Mar 2000) |
| km fibres | <cell biology> Bundles of microtubules running longitudinally below and to one side of the bases of cilia in a kinety. (17 Dec 1997) |