Purified dry preparations of coliphages Tl and T2 were tested for e.s.r.-absorption in the 3-cm-band. Unexpected absorption resembling very wide lines (approx. 1000 gauss) was found besides more usual absorption in viable and nonviable samples. Experimental evidence bearing on the origin of these lines is given and their meaning discussed tentatively.
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Müller et al. (1961) studied this question.