non-isotopicadj.

Brit.

/ˌnɒnʌɪsə(ʊ)ˈtɒpɪk/, U.S.

/ˈˌnɑnˌaɪsoʊˈtɑpɪk/

Origin: Formed within English, by derivation. Etymons: non- prefix, isotopic adj.

Etymology: < non- prefix + isotopic adj.

Chiefly Chemistry.

1. Consisting of or containing nuclides of different elements; not sharing the same atomic number. Now rare.

ΚΠ

1923 Proc. National Acad. Sci. U.S.A. 9 77 It is not to be expected..that the difference in the mobilities of the two isotopic chloride ions will be of the same magnitude as in the case of the non-isotopic mixtures.

1926 R. W. Lawson tr. G. Hevesy & F. Paneth Man. Radioactivity xiv. 183 In order to obtain a visible deposit we may add a trace of a thorium salt, or still better of a salt of the non-isotopic element zirconium..before the precipitation.

2. Not containing, involving, or of the nature of a distinctive or special isotope (cf. isotope n. b).

ΚΠ

1945 Jrnl. Biol. Chem. 159 697 Isotopic analyses were usually made on these inorganic salts, thus avoiding the dilution of the isotope [sc. C¹³] by non-isotopic carbon.

1953 J. S. Fruton & S. Simmonds Gen. Biochem. xxviii. 641 The administered isotopic glycine had ‘mixed’ with nonisotopic glycine already present in the body of the animal.

1974 Science 8 Feb. 512/2 One may estimate the glacial/interglacial temperature change in the surface water by nonisotopic means.

1998 Proc. National Acad. Sci. U.S.A. 95 10991/2 Nonisotopic detection of TH mRNA was carried out as described.

This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).

单词	non-isotopic
释义	non-isotopicadj. Brit. /ˌnɒnʌɪsə(ʊ)ˈtɒpɪk/, U.S. /ˈˌnɑnˌaɪsoʊˈtɑpɪk/ Origin: Formed within English, by derivation. Etymons: non- prefix, isotopic adj. Etymology: < non- prefix + isotopic adj. Chiefly Chemistry. 1. Consisting of or containing nuclides of different elements; not sharing the same atomic number. Now rare. ΚΠ 1923 Proc. National Acad. Sci. U.S.A. 9 77 It is not to be expected..that the difference in the mobilities of the two isotopic chloride ions will be of the same magnitude as in the case of the non-isotopic mixtures. 1926 R. W. Lawson tr. G. Hevesy & F. Paneth Man. Radioactivity xiv. 183 In order to obtain a visible deposit we may add a trace of a thorium salt, or still better of a salt of the non-isotopic element zirconium..before the precipitation. 2. Not containing, involving, or of the nature of a distinctive or special isotope (cf. isotope n. b). ΚΠ 1945 Jrnl. Biol. Chem. 159 697 Isotopic analyses were usually made on these inorganic salts, thus avoiding the dilution of the isotope [sc. C¹³] by non-isotopic carbon. 1953 J. S. Fruton & S. Simmonds Gen. Biochem. xxviii. 641 The administered isotopic glycine had ‘mixed’ with nonisotopic glycine already present in the body of the animal. 1974 Science 8 Feb. 512/2 One may estimate the glacial/interglacial temperature change in the surface water by nonisotopic means. 1998 Proc. National Acad. Sci. U.S.A. 95 10991/2 Nonisotopic detection of TH mRNA was carried out as described. This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022). < adj.1923
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