Raumaufbau des Protoplasmas.

Optical activity and living matter

“…The size of the colonies grown at various temperatures is indicated in terms of the size of the colonies grown at 20°as a unit. (From Gause, 1939. ) 86^^P IRAL 7'TT7>ST AND OPT.…”

“…It is of interest to know how an organism which presents a morphologically dissymmetric structure (right or left spiral) behaves when grown on a medium which is molecularly diss^anmetric. The dextral and sinistral strains of Bacillus mycoides were growm on the optical isomers of arginine (Gause, 1939). The results are summarized in Tables 16 and 17.…”

“…These experiments were rei:)eated with the optical isomers of the following-amino acids : leucine, histidine, phenyl-alanine and valine (Gause, 1939). The results obtained are given in Figure 10.…”

“…Then, the author did not attempt to obtain a concentration-toxicity curve which would allow one to make some quantitive calculations. Moreover, dl-nicotine is not the most suitable for such experiments, as it usually contains some hydronicotine which influences the physiological effect (Gause, 1936) ; only the purest dextro nicotine obtained by repeated crystallizations with laevotartaric acid should be used.…”

“…To illustrate these conclusions, let us consider in some detail the results of recent experiments made with a brood of the fish, Leuciscus idus var. orfiis (Gause and Smaragdova, 1939 Killing action of the optical isomers of nicotine on the fish Lencisciis idiis. The lower graph represents the toxicity curves in logarithmic coordinates.…”