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JMDMT #152 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - the toxicity produced by these agents in man. Antibiotics such as penicillin and tetracycline which exhibit the least toxicity in man prove to be excellent particle inhibitors; those, Table 2 A- Comparison of the Activity of Antibiotics in the X System WITH Chronic Toxicity in Man* Antibiotic tested Actinomycin D Actidione Bacitracin Neomycin Polymyxin Candicidin Streptomycin Cephalosporin C Novobiocin Oleandomycin Chloramphenicol Aureomj'cin Terramycin Penicillin Tetracychne ID50 ratio IDso protozoan protozoan particlef only X 0.9 1 0.9 %3E 1,000 0.9 370 1.1 32 1.2 32 0.9 %3E 1,000 1.8 350 10 %3E 1,000 10 320 14 450 22 220 39 40 116 370 312 %3E 1,000 930 220 Toxicity in man

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