| 释义 |
isotopically, adv.|aɪsəˈtɒpɪkəlɪ|
[f. prec.: see -ically.]
a. As regards isotopes or isotopic constitution.
1933in O.E.D. Suppl. 1940Jrnl. Biol. Chem. CXXXIII. 737 A deuteropalmitic acid is added to a mixture of isotopically normal fatty acids. 1960New Scientist 14 July 136/3 For an age determination it is not sufficient only to analyse the mineral for uranium, thorium and total lead, but the lead must also be analysed isotopically. 1963G. Troup Masers & Lasers (ed. 2) viii. 136 The electrons were localized on donor (Phosphorus) atoms in isotopically pure silicon of atomic weight 28 which has no nuclear magnetic moment. 1970Nature 23 May 738/2 The solar wind may actually deposit isotopically heavier carbon on the lunar surface. 1970D. W. Tenquist et al. University Optics II. v. 190 Isotopically pure elements must therefore be used.
b. By means of isotopes or isotopic methods.
1954New Biol. XVI. 74 The behaviour of isotopically labelled molecules. 1959Times 15 May 3/3 (Advt.), Vacancies for Chemists to work on the following projects:..c) the synthesis of isotopically labelled compounds. 1964G. H. Haggis et al. Introd. Molecular Biol. ii. 33 Many steps in the metabolic pathways of cells have been discovered or confirmed using isotopically labelled compounds. 1969Bennison & Wright Geol. Hist. Brit. Isles xii. 272 The rarity of isotopically datable rocks in the Triassic System of Britain and north-western Europe presents a further problem. |