Electron diffraction patterns having 3500 reflections out to 2 angstromns were obtained from wet microcrystals of catalase. No diffraction was obtained if the water vapor pressure was set below 90 percent of the equilibrium value.
The identification of gunshot residue (GSR) is a topic of great interest to the police officer and prosecutor and a problem for the criminalist. The police officer and prosecutor want a test that will demonstrate the existence of GSR on a subject's hands. The difficulty for the criminalist is in associating the quantitative amounts of the GSR-indicating elements (barium, antimony, and lead) exclusively with GSR. In this paper a technique is described that tries to identify as GSR the individual particles which are part of the components of the smoke emanating from the discharge of a firearm.
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