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SYNOPSIS As test objects for measuring the uptake of electron stains, virus particles have the advantage that their thickness is constant and known with fair accuracy. The fraction of the incident beam scattered by them out of the image can easily be deduced from the optical densities of electron micrographs and the degree of staining thus measured quantitatively. Some results are given and discussed in terms of electron scattering theory.
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R. C. Valentine (1958) studied this question.
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