Biology Reference
In-Depth Information
204
Figure 8-5.
Sketch of the fiber X-ray diffraction picture of the lithium salt of DNA obtained
by Wilkins' group (1960), including only up to the fourth layer line.
DIFFRACTION PATTERNS OF COMBINATION OF HELICES
Bessel function has well defined properties. The first peak of is
higher than that of etc., and that the former occurs at a smaller
value of In fact, there is a theorem stating that the zeros of successive
Bessel function occur between the zeros of the former one. Thus, since the
intensity spots on the first layer line are weaker than those on the second
layer line for 92% as well as 66% relative humidity (Figs. 8-1 and 8-3), and
since the intensity spots on the fourth layer line are missing, the presence of
another helix is indicated. In order to determine the relative positions of the
two helices, we would consider adding their amplitudes on the first four
layer lines in the phase plane (Figs. 8-6 and 8-7).
