Reduction of Radiation Sensitivity of Dry Bacterial Spores with Hydrogen Sulfide

Science  07 Oct 1960:
Vol. 132, Issue 3432, pp. 959-960
DOI: 10.1126/science.132.3432.959


Hydrogen sulfide redtuces the lethal effect of x-rays in dry spores by about 50 percent when given after irradiation, and by approximately 75 percent when present during irradiation. The first effect is the result of removal of radicals that are toxic when combined with oxygen; the second, the removcal of radicals that become toxic in the absence of oxygen. With these results we construct an explanation of the action of sulfhydryl compounds in protection against radiation damage.