Letter | Published:

Assay of Isotopic Nitrogen by Mass-Spectrometer


IN a recent communication, Capindale and Tomlin1 have pointed out some of the difficulties in measuring accurately the abundance of isotopic nitrogen (nitrogen-15), a measurement which is generally required when this isotope is used as a tracer in biological experiments.

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  1. 1

    Capindale, J. B., and Tomlin, D. H., Nature, 180, 701 (1957).

  2. 2

    Yemm, E. W., and Willis, A. J., New Phytol., 55, 229 (1956).

  3. 3

    Cocking, E. C., Ph.D. thesis, University of Bristol (1956).

  4. 4

    Fleury, P., C.R. Acad. Sci., Paris, 171, 957 (1920).

  5. 5

    Sprinson, D. B., and Rittenberg, D., J. Biol. Chem., 180, 707 (1949).

  6. 6

    Rittenberg, D., “Preparation and Measurement of Isotopic Tracers” (Edwards, Ann Harbor, Michigan, 1946).

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