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To study single molecules, Block has pioneered the use of optical tweezers, tiny laser-based "tractor beams" that produce miniscule piconewton forces to drag around molecules and allow measurements of displacements on the order of a nanometer. "You can stop and stall molecules, w follow their motion. Recently, we've studied the backtracking of RNA polymerase: when it makes a mistake, it can actually back up by five bases, scoop off the wrong thing and start again," says Block. While biological nanotechnology "hasn't even arrived at its infancy yet," says Block, "biological nanoscience is a very exciting place to be right now, because the techniques now exist to truly study proteins, and we're learning so much about them." Here's To Biology: Nature's Own Nanomachines Dr. Steve Block, Biology and Applied Physics Nature's own marvelous nanoscale machines include motors that spin bacterial flagella at up to 1000 revolutions per second and polymerases that step along DNA and RNA to facilitate the flow of genetic information. Block, along with other Stanford researchers such as Professors W. E. Moerner (Chemistry) and Steve Chu (Physics), are studying Nature's machines through single molecule science. This young field is devoted to following molecules one at a time rather than observing their averaged behavior, as has been done traditionally. To understand why average properties may obscure molecular behavior, "Consider a ship traveling from New York to San Francisco," says Block. "If it's small enough, it will travel down into the Caribbean and go across the Panama Canal and then back up to San Francisco. If it's a big oil tanker, it won't fit through the Panama Canal; it's got to go all the way around Cape Horn. But the average path of a ship traveling from New York to San Francisco would probably come out somewhere in the middle of the Amazon where there is in fact no route at all!" Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/iklan-mini/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/iklan-mini/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/