JMDMT #154 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection -inhibition. such as actinomycin and neomycin produce varying degrees of toxicity in man and are not selectively inhibitory for the particle. Thus, the particle-Pam- mecium system might be useful in predicting chronic human toxicity of poten- tially useful antibiotic substances. In figure 2 the effectiveness of penicillin in reducing the X population is shown. Under the conditions of the experi- ment complete destruction of the particles is achieved in 1 day at a concen- tration of 100 units per milliliter of the antibiotic. Xutrilional requirements of X-beariiig Paramecium. A nutritional study was made with particle-bearing and particle-free strains. The latter were obtained by treating axenically cultivated, X-containing