Abstract
Observations of biological ultrastructures bv electron microscopy are, in most cases, limited to a resolution of approximately 20 Å while, on the other hand, today's electron microscopes easily resolve 2 Å on non-biological objects. Thus, one order of magnitude seems generally unavailable for biological research. In order to take fuller advantage of the maximum resolving power of these microscopes, test specimens should first be studied to increase technical efficiency in high resdution imaging. For example, the graphite high resolution test, originally proposed by Heidenreich has proven of great value in this respect. However, the usefulness of this test re-1 mained limited as long as the direct magnification of the microscopes did not allow the visual recognition of the 3.4 Å periodic structure of graphite.
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