The stimulation of cell proliferation, the activation of metabolism, the expression of enzymatic genes, and adaptive response are only some of the biological effects that Eidus has found by analyzing experimental data relating to exposure to radiation in the narrow dose range of .05 to 1.0 Gy. Noting that repeated attempts to explain such effects in terms of traditional radiobiology of high doses, which seeks the mechanisms of the primary damage in DNA, he argues that the target of the damage is in fact plasmatic and intracellular membranes. c. Book News Inc.