| 释义 |
metachromasia Biol.|mɛtəkrəʊˈmeɪzɪə|
Also in anglicized form metachromasy |-ˈkrəʊməsɪ|.
[mod.L., f. meta- + Gr. χρῶµα, χρωµατ- colour: see -ia1.]
The property exhibited by certain biological materials and structures of staining a different colour from that of the stain used; also, the corresponding property of certain stains of changing colour in the presence of certain biological materials and structures.
1903Lancet 18 July 177/1 The cells which contain granules contain also a store of ferment (zymogen), whilst the cells that are destitute of granules exhibit the reaction of mucin (metachromasy). 1956Nature 3 Mar. 428/1 Anaphylactic shock brought out..degranulation and decrease of the metachromasia of the remaining granules in most of the cells. 1960L. Picken Organization of Cells x. 481 The amoebae..are found to become metachromatic..in increasing numbers as aggregation approaches... The appearance of metachromasy seems, however, to precede sensitivity to acrasin. 1964W. G. Smith Allergy & Tissue Metabolism iii. 33 Both tissue and blood mast cells are characterised by a coarse granular cytoplasm possessing a strong affinity for basic dyes, some of which change colour (exhibit metachromasia) as staining occurs. 1967New Scientist 2 Feb. 275/2 These fragments are then encapsulated by a high polymer (producing the green metachromasia) and enter some kind of ‘spore’ stage. 1971E. Gurr Synthetic Dyes i. ii. 63 The significance of the dimer spectra in terms of theories of metachromasy is discussed. |