| 释义 |
dalton2|ˈdɔːltən|
Also Dalton.
[f. the name of John Dalton (see Daltonian a. and n.).]
A name for the atomic mass unit (see atomic a. and n. A. 1), used chiefly in Biochem.; freq. used as a dimensionless unit of molecular weight.
1938C. M. Beadnell Dict. Sci. Terms 65/1 Dalton, mass unit, being the 1/16 of mass of O atom. 1967New Scientist 27 Apr. 196/1 The size in molecular weight units was about five million daltons—in other words each molecule of DNA weighed as much as five million atoms of hydrogen. 1969Nature 11 Oct. 150/1 All DNAs were sheared to a single-stranded molecular weight of about 400,000 Daltons by passage through a French pressure cell. 1970Ibid. 28 Nov. 889/2 Thus it would be correct to write..‘the molecular mass of protein X is 250,000 [read 25,000] daltons’; or ‘the relative molecular mass (that is, molecular weight) of protein X is 25,000’... It would, however, be incorrect to say: ‘the molecular weight of protein X is 25,000 daltons’, for the dalton is a unit of mass, and molecular weight is dimensionless. |