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The molecular weight of single-stranded DNA from the slime mold Physarum polycephalum has been determined by alkaline gradient centrifugation. The average molecular weight during DNA synthesis (∼1.5×10 7 D) is less than that observed in nonsynthetic periods (∼4×10 7 D). On the basis of a chromosome number of 50 per nucleus and a DNA content of 1μμg per nucleus, we are led to conclude...
A comparison of differences in incorporation and loss of radio-activity between two strains of Escherichia coli shows that: (a) three times as much irradiation is necessary to produce the same reduction in incorporation of H 3 -thymidine in B/r, the resistant strain, as in B s - 1 , the sensitive one; (b) radioactivity is lost from the DNA of previously labeled bacteria during the...