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  1. Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.
  2. H. Humfeld and I. C. Feustel, Proc. Soc. Exper. Biol. and Med. 54, 232 (1943).
    [CrossRef]
  3. The author is indebted to K. J. Palmer of this Laboratory for carrying out the x-ray test.
  4. H. Lundegårdh, Die quantitative Spectralanalyse der Elements (Gustav Fischer, Jena, I. 1929; II. 1934).
  5. J. Cholak and D. M. Hubbard, Ind. Eng. Chem. Anal. Ed. 16, 728 (1944).
    [CrossRef]
  6. E. J. Eastmond, J. Opt. Soc. Am. 34, 621 (1944).
    [CrossRef]
  7. C. R. Jeppesen, E. J. Eastmond, and H. G. Logan, J. Opt. Soc. Am. 34, 313 (1944).
    [CrossRef]

1944 (3)

1943 (1)

H. Humfeld and I. C. Feustel, Proc. Soc. Exper. Biol. and Med. 54, 232 (1943).
[CrossRef]

Cholak, J.

J. Cholak and D. M. Hubbard, Ind. Eng. Chem. Anal. Ed. 16, 728 (1944).
[CrossRef]

Eastmond, E. J.

Feustel, I. C.

H. Humfeld and I. C. Feustel, Proc. Soc. Exper. Biol. and Med. 54, 232 (1943).
[CrossRef]

Hubbard, D. M.

J. Cholak and D. M. Hubbard, Ind. Eng. Chem. Anal. Ed. 16, 728 (1944).
[CrossRef]

Humfeld, H.

H. Humfeld and I. C. Feustel, Proc. Soc. Exper. Biol. and Med. 54, 232 (1943).
[CrossRef]

Jeppesen, C. R.

Logan, H. G.

Lundegårdh, H.

H. Lundegårdh, Die quantitative Spectralanalyse der Elements (Gustav Fischer, Jena, I. 1929; II. 1934).

Ind. Eng. Chem. Anal. Ed. (1)

J. Cholak and D. M. Hubbard, Ind. Eng. Chem. Anal. Ed. 16, 728 (1944).
[CrossRef]

J. Opt. Soc. Am. (2)

Proc. Soc. Exper. Biol. and Med. (1)

H. Humfeld and I. C. Feustel, Proc. Soc. Exper. Biol. and Med. 54, 232 (1943).
[CrossRef]

Other (3)

The author is indebted to K. J. Palmer of this Laboratory for carrying out the x-ray test.

H. Lundegårdh, Die quantitative Spectralanalyse der Elements (Gustav Fischer, Jena, I. 1929; II. 1934).

Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.

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Figures (2)

Fig. 1
Fig. 1

Ion-exchange resin column for removal of calcium from culture media.

Fig. 2
Fig. 2

Analytical working curve for the determination of calcium in culture media.

Tables (2)

Tables Icon

Table I Calcium determinations on ten separately prepared samples of the same original culture medium.

Tables Icon

Table II Results of tests with known amounts of calcium added to a sample of culture medium. Results given in micrograms per ml.