| biochemical | Relating to biochemistry, characterised by, produced by or involving chemical reactions in living organisms. (18 Nov 1997) |
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| biochemical conversion process | The use of living organisms or their products to convert organic material to fuels. (05 Dec 1998) |
| biochemical genetics | The study of genetics in terms of the chemical (biochemical) events involved, as in the manner in which DNA molecules replicate and control the synthesis of specific enzymes by the genetic code. (05 Mar 2000) |
| biochemical mechanism | This is the general term for any chemical reaction or series of reactions, usually mediated by enzymes, which produce a given physiological effect in a living organism. (09 Oct 1997) |
| biochemical metastasis | The transportation and induction of abnormal immunochemical specificities in apparently normal organs. (05 Mar 2000) |
| biochemical oxygen demand | The amount of oxygen aerobicorganisms need to carry out oxidative metabolism in watercontaining organic matter, such as sewage. (09 Oct 1997) |
| biochemical phenomena | Biochemical functions, activities, and processes at organic and molecular levels in humans, animals, microorganisms, and plants. (12 Dec 1998) |
| biochemical profile | A combination of biochemical tests usually performed with automated instrumentation upon admission of a patient to a hospital or clinic. (05 Mar 2000) |
| genetics, biochemical | A branch of genetics which deals with the chemical structure of the genes and with the mechanisms by which the genes control and regulate the structure and synthesis of proteins. (12 Dec 1998) |
| addition-deletion mutation | <molecular biology> A type of mutation that results from insertion or deletion of a single nucleotide into, or from, an open reading frame in the normal DNA sequence. Normally, the genetic code is read in the wrong frame, three nucleotides at a time, and the entire sequence downstream of the mutation, is translated into a polypeptide with a garbled amino acid sequence from the mutated codon onwards. These mutations may be induced by certain types of mutagens or may occur spontaneously and usually result in the generation, downstream, of nonsense, chain termination codons. Synonym: addition mutation, addition-deletion mutation, deletion mutation, reading-frameshift mutation. (21 Jun 2000) |
| gene deletion | The total loss (or absence) of a gene. Gene deletion plays a role in birth defects and in the development of cancer. (12 Dec 1998) |
| chromosomal deletion | A microscopically evident loss of part of a chromosome. See: monosomy. (05 Mar 2000) |
| chromosome deletion | Actual loss of a portion of the chromosome. (12 Dec 1998) |
| clonal deletion | The removal of B-cell and T-cell varieties which recognise parts of the organisms body as targets of the immune system. This process naturally occurs early in the organisms development so that the organism will not be autoimmune (having an immune reaction against one's own body tissues) later in life. (09 Oct 1997) |
| clonal deletion theory | The elimination of certain T-cell populations in the thymus that have receptors for self-antigens. See: immunologic tolerance. (05 Mar 2000) |