131 Stoffaufnahme. Allgemeines 373 



126. Butkewitsch, W. Die Ausnutzung des Peptons als Kohlen- 

 stoffquolle durch die Citromyoes- Arten. (Bioeliem. Zeit.schr. 129, 1922, 

 p. 455—463.) — Ref. in Bot. Ctrbl., N. F. II, 1923, p. 43. 



127. Calm-Bronner, C. E. Ungleichmäßige Ernährung als Ur- 

 sachie wechselnder Empfindlichkeit und veränderter antigener 

 Eigenschaften der Bakterien. (Zeitschr. f. Immunitätsforsch, u. exp. 

 Therapie 33, 1921, p. 375—430.) 



128. Casada de la Fuonte, C. Über günstige Wirkung von Gips 

 auf Keimlinge der landwirtschaftlichen Kulturpflanzen. (Illustr. 

 Landw.-Ztg. 42, 1922, p. 340.) — Ref. in Bot. Ctrbl., N. F. II, 1923, p. 237 

 bis 238. 



129. Cook, F. C. Absorption of copper from the soll by potato 

 plants. (Journ. Agric. Research XX, 1921, p. 281— 287.) — Ref. in Bot. 

 Ctrbl., N. F. I, 1922, p. 267. 



130. Couiiiii, H. Sur l'origine de la carapace siliceuse des 

 Diatomees. (C. R. Acad. Sei. Paris 175, 1922, p. 1226—1229.) — Ref. in 

 Bot. Ctrbl., N. F. II, 1923, p. 461. 



131. Deatriok, E. P. The Effect of Manganese Compounds on 

 Solls and Plants. (Cornell Univ. Agric. Exp. Stat. Ithaca, N.Y., Mem. 19, 

 Febr. 1919, p. 371—402.) 



132. Dernby, K. G. La concentration optima en ions hydro- 

 gene favorisant le develoj)pement de certains microorganismes. 

 (Ann. de Flnst. Pasteur 35, 1921, p. 277—290.) 



133. Doflein, F. Mitteilungen über Chrysomonadinen aus dem 

 Schwarzwald. (Zool. Anz. LIII, 1921, p. 153—173, 4 Fig.) — Ref. in Bot. 

 Ctrbl., N.F. I, 1922, p. 116—117. 



134. Doflein, F. Untersuchungen über Chrysomonadinen. 

 (Arch. f. Protistenk. XLIV, 1922, p. 149—213, Taf. 6—10, 3 Fig.) — Ref. in 

 Bot. Ctrbl., X. F. I, 1922, p. 271. 



135. Ehrenberg.P. Welche Bedeutung hat das Massenwirkungs- 

 gesetz bei Vorgängen im Innern der Pflanzen? (Fühlings Landw. 

 Ztg. LXX, 1921, p. 418—428.) — Ref. in Bot. Ctrbl., X. F. I, 1922, p. 142. 



136. EUis, J. F., Nelson, V. E. and Slierwood, F. F. The Xutritional 

 Requirements of Yeast. II. The Effect of the Composition of 

 the Medium of the Growth of Yeast. (Journ. Amer. Chem. Soc. 43, 

 1921, p. 191 — 199.) — Summary: 1. A method is given by which is determined 

 the Optimum concentration of each of the constituents of the medium for the 

 growth of yeast. 2. The optimum concentration of several ammonium salts 

 was found to be identical witli that for ammonium chloride. These salts are 

 equally efficient at the optimum concentration. 3. The optimum concentration 

 of ammonium chloride for the growth of yeast is the concentration of the 

 aalt in which a protein (wheat gluten) is least swoUen. 4. The optimum con- 

 centration of ammonium chloride varies with the temperature. At the tempe- 

 ratures tested the concentrations of the salt causing the least swelling of a 

 protein (wheat gluten) are identical with those most favorable to yeast growth. 

 5. The effect of certain colloidal materials upon the growth of yeast has been 

 determined. 



137. Euler, H. v. und Myrbäck, K. Zur Kenntnis der Aziditäts- 

 bedingungen und der Temperaturempfindlichkeit der Saccharase. 



