| lyo- | Dissolution. See: lyso-. Origin: G. Lyo, to loosen, dissolve (05 Mar 2000) |
|---|---|
| lyoenzyme | <enzyme> An enzyme performing its functions outside a cell; e.g., the various digestive enzyme's. Synonym: exoenzyme, lyoenzyme. (05 Mar 2000) |
| lyolysis | Rarely used term for solvolysis. (05 Mar 2000) |
| Lyon hypothesis | <genetics> Hypothesis, first advanced by Lyon, concerning the random inactivation of one of the two X chromosomes of the cells of female mammals. In consequence females are chimaeric for the products of the X chromosomes, a situation that has been exploited in female Negroes (who are heterotypic for isozymes of glucose 6 phosphate dehydrogenase) as a means to confirm the monoclonal origin of papillomas and of atherosclerotic plaques. (20 Mar 1998) |
| Lyon, B | <person> Vincent, U.S. Physician, 1880-1953. See: Meltzer-Lyon test. (05 Mar 2000) |
| Lyon, Mary | <person> English cytogeneticist, *1925. See: Lyon hypothesis, lyonization. (05 Mar 2000) |
| Lyonisation | <genetics> Hypothesis, first advanced by Lyon, concerning the random inactivation of one of the two X chromosomes of the cells of female mammals. In consequence females are chimaeric for the products of the X chromosomes, a situation that has been exploited in female Negroes (who are heterotypic for isozymes of glucose 6 phosphate dehydrogenase) as a means to confirm the monoclonal origin of papillomas and of atherosclerotic plaques. (20 Mar 1998) |
| lyonization | The inactivation of an X chromosome. One of the two x chromosomes in every cell in a female is randomly inactivated early in embryonic development. Named after geneticist mary lyon. (12 Dec 1998) |
| lyophil | Lyophile A substance that is lyophilic. (05 Mar 2000) |
| lyophilic | <chemistry> Characteristic of a material that readily forms a colloidal suspension. Molecules of the solvent form a shell around the particles, if the solvent is water then hydrophilic. (20 Mar 1998) |
| lyophilic colloid | A colloidal dispersion in which the dispersed particles are more or less liquid and exert a certain attraction on and absorb a certain quantity of the fluid in which they are suspended. Synonym: emulsion colloid, hydrophil colloid, hydrophilic colloid, lyophilic colloid. (05 Mar 2000) |
| lyophilisate | <biochemistry> The product of lyophilisation (the creation of a stable preparation of a biological substance, such as blood plasma or serum, by rapid freezing and dehydration of the frozen product under high vacuum). (20 Mar 1998) |
| lyophilization | The process of isolating a solid substance from solution by freezing the solution and evaporating the ice under vacuum. Synonym: freeze-drying. (05 Mar 2000) |
| lyophobe | A substance that is lyophobic. (05 Mar 2000) |
| lyophobic | In colloid chemistry, denoting a dispersed phase having but slight affinity for the dispersion medium; when the dispersed phase is lyophobic, the colloid is usually an irreversible one. Origin: Lyo-+ G. Phobos, fear (05 Mar 2000) |