BEDFORD, Mass., Sept. 9 -- Spire Corp. announced it has received a $400,000 Phase I SBIR grant from the National Institute of Neurological Disorders and Stroke, under the National Institutes of Health Bioengineering Nanotechnology Initiative, to develop nanostructured porous silicon coatings to enhance the biocompatibility of silicon-based neural electrodes, which someday may be used for biological control of prosthetic devices. Success of the Phase I program can lead to a Phase II grant for as much as $1.2 million, the company said. 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