Turner, N.C. , and Crowell, G.E.: Dental Caries and Tryptophan Deficiency , J. D. Res. 26: 99, 1947.
2.
Shaw, J.L.D. , and Mac Farlane, W.D.: The Determination of Tryptophan by a Modified Glyoxilic Acid Method Employing Photoelectric Colorimetry, Canad. J. Res., Sect. B16: 361, 1938.
3.
Shaw, J.L.D. , and Mac Farlane, W.D.: A Critical Study of the p-Dimethylaminobenzaldehyde Method for Determining Tryptophane as Contrasted With the Glyoxylic Acid Method , J. Biol. Chem. 132: 387, 1940.
4.
Stack, M.V.: The Independence of Caries Experience and Salivary Tryptophane Content, J. D. Res. 33: 316, 1954.
5.
Berg, M., Burrill, D.Y., and Fosdick, L.S.: Chemical Studies in Periodontal Disease. III, J. D. Res. 25: 231, 1946.
6.
Boyd, W.J.: Note on the Determination of Tryptophan by Means of p-Dimethylaminobenzaldehyde, Biochem. J. 23: 78, 1929.
7.
Turner, N.C. , and Anders, J.T.: Dimethylaminobenzaldehyde as a Measure for Salivary Tryptophane, J. D. Res. 35: 241, 1956.
8.
Horn, M.J., and Jones, D.B.: Colorimetric Method for the Determination of Tryptophan in Proteins and Foods , J. Biol. Chem. 157: 153, 1945.
9.
Kirch, E.R., Kesel, R.G., O'Donnell, J.F., and Wach, E.C.: Amino Acids in Human Saliva, J. D. Res. 26: 297, 1947.
10.
Baumgarten, W., Garey, J.C., Olsen, M.J., Stone, L., and Boneff, C.S.: Medium for Obtaining Maximal Growth Response in Microbiological Assays of Amino Acids, J. Am. Chem. Soc . 66: 1607, 1944.
11.
Kirch, E.R. , Kesel, R.G., O'Donnell, J.F., and Wach, E.C.: Amino Acids in Saliva of Human Beings on a Low Protein Diet, J. D. Res. 29: 779, 1950.
12.
Kirch, E.R. , Kesel, R.G., O'Donnell, J.F., and Wach, E.C.: Influence of Ingestion of Single Amino Acids on the Level of Free Amino Acids in Human Saliva, J. D. Res. 32: 57, 1953.
13.
Beerstecher, E.B., Jr.: The Inhibition of Bacterial Growth With 5-Methyltryptophan, J. Bact. 68: 152, 1954.
14.
Stokes, J.L. , Gunness, M., Dwyer, 1. M., and Caswell, M.C.: Microbiological Methods for the Determination of Amino Acids, J. Biol. Chem. 160: 35, 1945.
