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SEPTEMBER 22, 2003
Seeing-Eye CD Players for the Blind Those teensy silicon chips that help keep track of products in warehouses may one day open up new vistas for the blind. University of Rochester students under Jack G. Mottley, an associate professor of electrical engineering, have built a system that uses radio-frequency ID (RFID) tags and a portable CD player to deliver spoken navigation guides to designated places. For example, a CD guide to a college campus could respond to RFID tags mounted on doors and buildings by announcing "Professor Mottley's office" or "entrance to the physics building is five steps up." The system, Navigational Assistance for the Visually Impaired (NAVI), uses tags as small as rice grains, that cost about 25 cents. Each emits a distinctive code when triggered by a radio signal from NAVI's antenna, which resembles a handheld microphone. The code tells the CD machine what segment to play. A polished version of the toaster-size prototype, predicts Mottley, could pack everything inside a portable CD player. By Otis Port Spider-Man's Secret Is Out -- at Last Researchers have finally found the key to the silk spiders spin. For more than a decade, all attempts to duplicate spiders' magic -- and there have been many, in both industrial and academic labs -- have fallen short. Nexia Biotechnologies Inc. comes very close, using silk proteins produced in the milk of genetically modified goats, but its silk strands aren't yet quite as strong. What seems to be the final piece of the puzzle appears in the Aug. 28 Nature. A Tufts University team led by David L. Kaplan, director of Tufts' Bioengineering Center, lays out how spiders -- and silkworms -- regulate the mix of water and silk protein in their silk-spinning glands: They carefully maintain a structure akin to a gel of soap bubbles until a strand emerges into the air. Only then does the protein crystallize fully. The new findings, says Kaplan, point the way to commercial spider silk from goats or perhaps modified bacteria. Such fibers would be ideal for body armor for police officers and soldiers. By Otis Port   Robots among the Ruins Last month, after a mock earthquake partly demolished the old town library in Lebanon, Ind., small robots crawled into the rubble, searching for the half-dozen mannequins that had been planted in the building before it collapsed. It was just a practice session for a team from the University of South Florida's Center for Robot-Assisted Search & Rescue (CRASAR), but devices like these are already functional: After the September 11 terrorist attacks two years ago, CRASAR helped probe the rubble in New York with remote-control robots -- and found body parts. Since then, CRASAR director Robin R. Murphy has been busy developing new sensors so bots can tell if a victim is still alive. That way, she explains, rescue workers won't waste precious hours digging out dead bodies while there's still hope of finding survivors. One sensor detects blood flowing in a victim's veins by touching exposed skin. If the robot can't get that close, another sensor can pick up exhaled carbon dioxide from a few feet away. Next up, says Murphy, could be remotely-controlled robots than can deploy and inflate air bags to prop up the rubble around a survivor. That tops the to-do list for the new industry-university center that CRASAR is now setting up, aided by the National Science Foundation. By Otis Port Innovations -- For centuries, scholars have praised sage for more than just its pretty lavender-colored blossoms. "It also heals the memory," according to a 1652 textbook. And so it may -- for at least a couple of hours. Researchers at Britain's Medicinal Plant Research Center gave 44 volunteers either sage-oil or placebo capsules and tested their ability to recall a list of words up to six hours later. Over the next three hours, those who got sage oil scored much higher. More trials are under way to see if it can mitigate the effects of Alzheimer's disease. -- Heat from nuclear waste could be used to seal it safely away, deep within the earth's crust, according to a report in the August issue of Geology. British engineer Fergus G.F. Gibb proposes dumping radioactive waste into holes three miles deep. The "hot" waste would melt the solid granite rock, which would soon resolidify, forming a protective tomb that should last nearly 1 billion years -- far longer than the estimated 10,000-year life span of containers at the Yucca Mountain repository in Nevada. -- Foodmakers may soon be able to cut salt and sugar in their snacks without sacrificing flavor. Researchers from Germany's University of Münster, working with Nestlé scientists in Vevey, Switzerland, have identified a new flavor enhancer called alapyridaine that increases both saltiness and sweetness. The compound was discovered in beef stock and is itself tasteless. So far, alapyridaine shows no signs of triggering the headaches and other irritating side effects caused by MSG, the standby flavor enhancer. By Otis Port
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