John Topalian

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X-ray micrographs of biological objects have been obtained with a resolution better than 1000 angstroms by using poly(methyl methacrylate) x-ray resist and carbon Kalpha or synchrotron radiation. Synchrotron radiation allows short exposure times; storage rings especially designed as radiation sources and improved x-ray resists would make exposure times(More)
The defense industry has previously relied heavily on hazardous chemicals in a variety of manufacturing operations. The Environmental Protection Agency (EPA) identified 17 of these hazardous chemicals under the provisions of the 33/50 program that are to be reduced or eliminated. In line with policy decisions and public expectations, the Pentagon is further(More)
High resolution x-ray lithographic studies of cells from chick embryo hearts dried by the CO2 critical point method have been made with soft x-ray radiation of different wavelengths. A marked difference in the relief replica in polymethyl methacrylate (PMMA) resulting from the differential absorption by the dried cells of carbon K alpha radiation at 4.48 nm(More)
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