High Density Liquid Crystalline DNA

High Density Columnar Hexatic Liquid Crystalline DNA

Another beautiful photomicrograph, which displays a color transition from pink to green in the focal conic texture. Heavy striations also indicate that the specimen is approaching the concentrations observed in single crystals. The DNA concentration for this specimen is approximately 475 milligrams per millimeter, and the magnification is approximately 350x. The digital image presented above was originally recorded on Fujichrome 64T transparency film using a Nikon Optiphot-Pol microscope with crossed polarized illumination. Exposures were recorded about 2.5 f-steps under the recommended value given by an in-camera photomultiplier and were push-processed approximately 1.5 f-steps in the first E-6 developer.

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