| 单词 |
ultramicro- |
| 释义 |
ultramicro-, prefix and quasi-a. Chem.|ʌltrəˈmaɪkrəʊ|
[f. ultra- 2 + micro- 2 a, 8 b.]
Formative element denoting chemical analysis or research which involves very minute quantities (of the order of a few microgrammes or less), as in ultramicroanalysis, ultramicro-analytical adj., ultramicro-chemistry, ultramicro-chemical adj. Also used without a hyphen as an independent word.
1937Ann. Rev. Biochem. VI. 90 The methods of capillary colorimetry are necessarily more difficult than the other ultramicro methods which have been discussed. 1940Ibid. IX. 599 Drop analysis.—Ultramicrochemical methods have been advanced..in regard to the number of constituents determinable. 1946Chem. Abstr. XL. 6017 (heading) Ultramicroanalysis. III. A method for enriching copper by selective adsorption and for destroying organic matter in the determination of copper. 1946Chem. & Engin. News XXIV. 1195/2 The field which embraces the chemical study of material on this minute scale of operation has been given the name ‘ultramicrochemistry’ by P. L. Kirk, a pioneer investigator in the field of quantitative chemistry on the microgram scale. 1946Nature 31 Aug. 313/1 (heading) Ultra-micro methods in nuclear chemistry. 1962H. Heath in A. Pirie Lens Metabolism Rel. Cataract 365 Ultra-microanalytical methods have to be used to detect the last traces of ascorbic acid. 1971Analytical Biochem. XLIV. 503 (heading) Quantitative ultramicroanalysis of amino acids in the form of their DNS-derivatives. 1973Biol. Abstr. LVI. 1717/1 (heading) Ultramicrochemical methods for the analysis of tissues and cells of the inner ear. 1979Ma & Rittner Mod. Organic Elemental Analysis xi. 366 Since it is now possible to carry out organic synthesis at the microgram level, the applications of ultramicro analytical methods become apparent. |
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单词 ultramicroscope 释义 ultramicroscope[f. ultra- 2 c + microscope n., or a back-formati......