| 释义 |
hyperchromic, a.|haɪpəˈkrəʊmɪk|
[f. hyper- 5 + Gr. χρῶµ-α colour + -ic.]
1. Med. Characterized by or designating a colour index greater than one, or red blood cells that contain more hæmoglobin than normal and show little or no central pallor.
1924T. R. Waugh in Canad. Med. Assoc. Jrnl. XLVII. 114/2 The color index is high, though total cell volume may be considerably reduced. Such a condition may be termed, therefore, hyperchromic. We find this type of anaemia..especially in pernicious anaemia. 1935Whitby & Britton Disorders of Blood vi. 116 The anæmia produced by a deficiency of the hæmopoietic principle is invariably macrocytic and almost always markedly hyperchromic. 1942M. M. Wintrobe Clin. Hematol. vi. 225 It has been assumed that the red corpuscles in this condition [sc. pernicious anæmia] are ‘hyperchromic’ or supersaturated with hemoglobin. This is not true... The darker appearance of these corpuscles..is due to their increased thickness. 1960C. H. Smith Blood Dis. Infancy & Childhood v. 62 Hyperchromic anemias identify conditions in which macrocytes prevail and in which the color index is greater than unity.
2. Characterized by or exhibiting an increase in the extent to which light (usually, ultra-violet radiation) is absorbed; chiefly in hyperchromic effect.
1939W. R. Brode Chem. Spectroscopy vii. 128 Ethylene..has an absorption band at 1545 f (1950 A) in the extreme ultraviolet, but the conjugated coupling of two or more ethylene radicals together results in both hyperchromic and bathochromic effects. 1955G. Schmidt in Chargaff & Davidson Nucleic Acids I. xv. 569 The quantitative degradation of PNA to mononucleotides by alkali is accompanied by an increase of approximately 20% in the absorption at 260 mµ (hyperchromic effect). 1958Nature 29 Nov. 1503/2 The hyperchromic degradation of polymers. 1968M. W. Strickberger Genetics v. 73 The double-stranded form [of DNA] is called hypochromic, and the loose, single-stranded form is called hyperchromic.
Hence ˌhyperchroˈmicity, the property of absorbing more (ultra-violet) light.
1958Nature 29 Nov. 1502/1 In view of the profound importance of the anomalous ultra-violet absorption characteristics of nucleic acids in relationship to the fine structure of the macromolecule, the hyperchromicity of a number of relatively simple polynucleotide derivatives was studied. 1968M. W. Strickberger Genetics v. 73 Hyperchromicity [of DNA] can be induced by heating. |