| HE | half-scan with extrapolation; hard exudate; hektoen enteric [agar]; hemagglutinating encephalomyelit... |
|---|---|
| HEI | Health Effects Institute; high-energy intermediate; homogenous enzyme immunoassay; human embryonic i... |
| HMRTE | human milk reverse transcriptase enzyme |
| HRE | hepatic reticuloendothelial [cell]; high-resolution electrocardiography; hormone receptor enzyme |
| HRTE | human reverse transcriptase enzyme |
| constituent enzyme | <biochemistry> Any of many enzymes that a cellmust have at all times to stay alive. (09 Oct 1997) |
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| constitutive enzyme | <enzyme> An enzyme that is constantly produced by the cell regardless of the growth conditions. Compare: induced enzyme. (05 Mar 2000) |
| cooperative enzyme | <enzyme> An enzyme that exhibits the property of cooperativity. (05 Mar 2000) |
| coordinated enzyme synthesis | The regulatory mechanism where an entire group of different enzymes, all of which play a part in the same metabolic process, is synthesised at the same time. This comes about because the chemical signal to begin synthesis of each enzyme is the same for all of them. (09 Oct 1997) |
| heat-stable enzyme | <enzyme> An enzyme that is not readily subject to destruction or alteration by heat. Synonym: heat-stable enzyme. (05 Mar 2000) |
| Schardinger enzyme | <enzyme> Dehydrogenases involved in conversion of hypoxanthine to xanthine and xanthine to uric acid, as the final catabolism of purines. Deficient in the human disease xanthinuria. (18 Nov 1997) |
| proteolytic enzyme | <enzyme> See protease or peptidase. (18 Nov 1997) |
| heterotrophic enzyme | <biochemistry> An allosteric enzyme that must be modulated by a biomolecule other than its substrate. (09 Oct 1997) |
| homotropic enzyme | <biochemistry> An allosteric enzyme that is modulated byits substrate. (09 Oct 1997) |
| hybrid enzyme | <biochemistry> An enzyme in a heterozygous individual which has subunits with slightly different sequences of amino acids than other copies of the same enzyme. This occurs because the two alleles of the genes which code for each subunit are slightly different (due to the heterozygosity), so that either of the two versions of the subunit could be produced for any copy of the enzyme. (09 Oct 1997) |
| hydrolytic enzyme | <biochemistry> See hydrolase. (18 Nov 1997) |
| new yellow enzyme | The d-amino-acid oxidase found in yeast, a flavoenzyme, which contains FAD as coenzyme instead of FMN as does NADPH dehydrogenase; so-called to distinguish it from Warburg's old yellow enzyme. Compare: amino acid oxidases. (05 Mar 2000) |
| defect, enzyme | An abnormality in the protein (enzyme) important in catalyzing a normal biochemical reaction in the body. Disorders result from a deficiency (or functional abnormality) of an enzyme. Archibald Garrod in 1902 was the first to attribute a disease to an enzyme defect: an inborn error of metabolism. Today, newborns are routinely screened for certain enzyme defects such as phenylketonuria (PKU) and galactosaemia, an error in the handling (metabolism) of the sugar galactose. (12 Dec 1998) |
| D enzyme | Dextrin transglycosylase or glycosyltransferase;a 4-glycosyltransferase converting maltodextrins into amylose and glucose by transferring parts of 1,4-glucan chains to new 4-positions on glucose or other 1,4-glucans. Synonym: amylomaltase, D enzyme, dextrin glycosyltransferase, dextrin transglycosylase, disproportionating enzyme. (05 Mar 2000) |
| disproportionating enzyme | Dextrin transglycosylase or glycosyltransferase;a 4-glycosyltransferase converting maltodextrins into amylose and glucose by transferring parts of 1,4-glucan chains to new 4-positions on glucose or other 1,4-glucans. Synonym: amylomaltase, D enzyme, dextrin glycosyltransferase, dextrin transglycosylase, disproportionating enzyme. (05 Mar 2000) |