Abstract
The positions and maximum photographic intensities of reflexions have been measured on X-ray microphotographs of highly crystalline sodium thymonucleate fibres. A procedure is described for deducing from these measurements the integrated intensities of the reflexions. These have been used to calculate the cylindrically symmetrical Patterson function. From this Patterson function it was possible to obtain the unit cell and hence to allot indices to all the 66 observed reflexions. Confirmation of the correctness of the indexing was obtained from photographs of a single fibre which showed double orientation of the crystallites. Measurements of the density of wet and dry ~qa DNA are described, and the possible shape of the fundamental structural unit is discussed.
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