| heterogeneous catalysis | <chemistry> A form of catalysis in which the catalyst is in different physical state than the reactants. (09 Jan 1998) |
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| general acid-base catalysis | A catalytic reaction that involves the tranfer of a proton to or from anon-water molecule. (09 Oct 1997) |
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| catalysis | <chemistry> The acceleration of a chemical reaction by a catalyst. (16 Mar 1998) |
| homogeneous catalysis | <chemistry> A form of catalysis in which the catalyst is in the same physical state than the reactants, for example reactants and catalyst are all gases. (09 Jan 1998) |
| RNA, heterogeneous nuclear | Nuclear nonribosomal RNA larger than about 1000 nucleotides, the mass of which is rapidly synthesised and degraded within the cell nucleus. Some heterogeneous nuclear RNA may be a precursor to mRNA. However, the great bulk of total hnrna hybridises with nuclear DNA rather than with mRNA. (12 Dec 1998) |
| heterogeneous | <pathology> Composed of varied cell types. (16 Dec 1997) |
| heterogeneous nuclear RNA | An ill-defined form of RNA, of high molecular weight, that never leaves the nucleus and is thought to be the precursor of messenger RNA. (05 Mar 2000) |
| heterogeneous radiation | Radiation consisting of different frequencies, various energies, or a variety of particles. (05 Mar 2000) |
| heterogeneous system | In chemistry, a system that contains various distinct and mechanically separable parts or phases; e.g., a suspension or an emulsion. (05 Mar 2000) |