DNA-lipid cast film

Fig. 6 A DNA-lipid cast film prepared from a solution of DNA-lipid complexes...

The DNA-lipid cast film was stretched ca. three times in length (ca. 20 p.m thick) in the wet state, and X-ray diffraction patterns are shown in Fig. 7b. When the incident beam was irradiated parallel to the top edge of the stretched film, the circular reflection of 41 A was observed. When the beam was exposed parallel to the side edge and perpendicular to the film plane, the diffraction on the equator appeared as two spots of 41 A indicating a distance between the DNA-lipid strands and the diffraction on the meridian of 3.4 A. The distance between parallel stacked base-pairs was clearly observed [2-4]. These findings clearly show that DNA strands are ahgned... 

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