Courtesy of Michael J. Sailor
imparts a rainbow of colors to a porous silicon chip, one of a variety of new biosensor technologies in development around the world. The different colors correspond to different sized pores, ranging from a few nanometers to hundreds of nanometers in diameter. These pores help the device discriminate and detect proteins and other molecules based on their size.
One morning in March 1995, the deadly nerve gas sarin wafted through the Tokyo subway system. Six years later, spores of lethal
It is the evident ease with which these three attacks were carried out that has security personnel around the world on edge. And ...