BIOLOGY AND MEDICINE RESEARCH Biology Cytogenetics--It has been previously demonstrated that hydrogen peroxide does not induce mutations in Paramecium even when t catalase in that neither peroxide ner cyanide present during X-irradiation modifies tie induced mitation rate, Calculations show that the average concentrafi on of peroxide the cell is partially poisoned by cyanide. It has been sho inside a cell the size of a paramecium is a large fraction off € that outside. mutation experiments. At these doses, more than half of the fect is eliminated when irradiation occurs in the absence of oxygen. may be concluded that oxygen does not exert its influence on the mutagenic action of X-rays by its influence on peroxide formation. The ratio of chromatid aberrations induced by X ra in the presence of air and in pure nitroge~ indicates a pron in. Tradescantia ced wave-length effect. For chromatid deletions the ratic increases from 1 ger (50 kvp) shorter wave lengths (gamma rays): with isochromatid deletion Is the ratio changes in the reverse direction. @) | to Biochemistry--The cell-free bacterial luminescence recently produced at ORNL was examined from the standpoint of emission sy ectrum, ultraviolet effect, and of its dependence upon temperature, pH, 3 ibitors, Substrates, and cofactors. In addition to reduced coenzyme- and riboflavin =~ lle <r. DOE ARCHIVES