The applications of magnetic materials and magnetic fields in medicine are reviewed. Direct biological effects of magnetic fields, clinical uses of the mechanical force exerted by magnets, and magnetic analysis as a tool in biochemistry are considered. The authors' applications of the technology of fine particle iron to the treatment of cancer and mental disease, for investigation of basic biochemistry and for diagnostic purposes are discussed. A significant step in these applications has been the discovery of sublingual assimilation of fine particle iron.
A significant change is reported in mean particle size and shape characteristics of carbon black due to specimen contamination while under examination in electron microscopes. The effect is described for a number of well-known commercial blacks and examples are given in graphical form to illustrate expected variations in mean particle size with continued bombardment at normal focusing intensities. The effect is observed in other materials but is more pronounced in carbon black. Suggestions are made for minimizing the effect.
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