Jomc, 1920] PHYSIOLOGY 421 



L'SCS;. Johns, C. ()., and A. J. Finks. Lysine as a hydrolytic product of hordein. Jour. 

 Biol. C'hcni. 38:03-66. 1919. — The basin amino acids found in hordein, the alcohol-soluble 

 protein of barley (Hordeum Vlilgare) are cystine, arginine, bistidine and lysine. Lysine has 

 not before been shown to be present in this protein. The percentages of the different basic 

 amino acids in hordein are almost the same as those found in gliadin, the alcohol-soluble 

 protein of wheat. The free amino nitrogen in hordein was found to be equal to one-half of 

 the lysine nitrogen. — George B. Bigg, 



2809. Joshi, N. V. Rate of nitrification of different green manures and parts of green 

 manures and the influence of crop residues on nitrification. Agric. .Jour. India 14:305-413. 

 1919.— See Bot. Absts. 3, Entry 2937. 



2870. McClendon, J. F., and H. J. Prendergast. Note on the ultra microscopy of 

 egg albumen. Jour. Biol. Chem. 38:549. 1919. — When egg albumen was recrystallized 

 three times and a saturated solution of the crystals was made in distilled water, only a few 

 submicrons were found. They are believed to be due to slow precipitation. The more that 

 is known of the physical chemistry of proteins, the less they appear to resemble the suspen- 

 sion colloids, and it seems unfortunate that clear solution of proteins should be classed with 

 suspensoids under the term "colloids." — George B. Rigg. 



2871. Osborne, T. B., and L. B. Mendel. The nutritive value of yeast protein. Jour. 

 Biol. Chem. 38: 223-227. 1919. — Rats were successfully kept for more than a year, covering 

 the period of growth, upon a diet in which yeast furnished the sole source of nitrogen as well 

 as w r ater-soluble vitamine.— George B. Rigg. 



2872. Osborne, T. B., A. J. Wakeman, and Edna L. Ferry. Preparation of protein free 

 from water-soluble vitamine. Jour. Biol. Chem. 39: 35-46. 1919. — Many proteins, especially 

 casein, can easily be prepared so free from water-soluble vitamines that animals fed on them 

 decline in weight within a few days, unless some other source of this food factor is supplied. 

 Edestin is an example of a plant protein that has been so prepared. The chemical nature of 

 vitamines is wholly unknown.— George B. Rigg. 



2873. Patten, N. E., and A. J. Johnson. The effect of hydrogen ion concentration on the 

 liquefaction of gelatin. Jour. Biol. Chem. 38: 179-190. 1919 — The setting of gelatin is -in- 

 fluenced by the hydrogen ion concentration of the medium, and unless the gelatin is destroyed 

 this effect is probably reversible. Gelatin in the concentrations used is not without effect upon 

 the buffer solutions, displacing the Ph in such a manner as one would expect from an aggre- 

 gate of amino-acids acting amphoterically. — George B. Rigg. 



2874. Schotjten-Ilcken, W. S. J., and R. W. Tuinzing. Die Bestimmung des Ammoni- 

 akstickstoffs in Dungstoffen auf iodometrischem Wege. [Estimation of nitrogen as ammonia 

 in fertilizers by the iodometric method.] Landw. Versuchsst. 89: 233. 1917. — The time-con- 

 suming and expensive method of distilling with magnesia was discarded at the experiment 

 station and the authors suggest in place of it the use of iodometric methods. Chemical reac- 

 tions and method of procedure are given in the abstract. Data submitted indicates the 

 accuracy of the method. [Based on Volhard's review in Biedermann's Zentralbl. Agrikultur- 

 chen. 47: 297-299. 1918.]— F. M. Schertz. t 



2875. Sherman, H. C, J. C. Winters, and V. Phillips. Efficiency of oat protein in 

 adult human nutrition. Jour. Biol. Chem. 39:53-62. 1919. — In practical dietetics equal 

 weights of oat and maize proteins may be regarded as essentially equal in value. Small 

 amounts of milk will apparently so supplement these that their efficiency is comparable with 

 that of the average protein of a mixed diet.— George B. Rigg. 



2876. Volhard, J. [Rev. of: Pfeiffer, Th. and W. Simmkrmacher. Uber die Wir- 

 kung des Dicyandiamids auf das Pflanzenwachstum. (The action of dicyanodiamide on the 

 plant growth.) Landw. Versuchsst. 90:415-430. 1917.] Biedermann's Zentralbl. Agri- 

 kulturchem. 47: 243-246. 1918.— See Bot. Absts. 3, Entry 1792. 



