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image contrast of biological materials in high-voltage electron microscopy.a new and simple expression has been formulated for the estimation of contrast of amorphous specimens in the tilted-beam mode of dark-field (df) imaging in a high-voltage electron microscope. df contrasts have been calculated for aids1.dna, salmonella typhimurium dna, human haemoglobin and myoglobin of sperm whale in the range 0.1-3.0 mv and compared with the corresponding bright-field (bf) contrasts. df contrast is seen to be significantly greater than bf contrast for a wide range of microscope ...19979090858
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