Phase transitions between the cholesteric and high density liquid crystalline DNA phases occur with the formation of batonnets during unwinding of the cholesteric mesophase. This transition region is illustrated in the photomicrograph presented above, which demonstrates the high degree of order induced by the magnetic field. The magnification is approximately 75x, and the image was recorded on Fujichrome 64T transparency film using a Nikon Optiphot-Pol microscope with crossed polarized illumination. Exposures were recorded about 3 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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