The U.S. space agency says it's developed a nanotechnology-based biosensor that can detect trace amounts of biohazards.

The device, developed at the National Aeronautics and Space Administration's Ames Research Center in California, can detect specific bacteria, viruses and parasites. NASA said the biosensor will be used to help prevent the spread of potentially deadly biohazards in water, food and other contaminated sources.

The technology has been licensed to Early Warning Inc. of Troy, N.Y.

"The biosensor makes use of ultra-sensitive carbon nanotubes which can detect biohazards at very low levels," explained Meyya Meyyappan, chief scientist for exploration technology and former director of the Center for Nanotechnology at Ames. "When biohazards are present, the biosensor generates an electrical signal, which is used to determine the presence and concentration levels of specific micro-organisms in the sample. Because of their tiny size, millions of nanotubes can fit on a single biosensor chip."

Early Warning officials said food and beverage companies, water agencies, industrial plants, hospitals and airlines could use the biosensor to prevent outbreaks of illnesses caused by pathogens -- and do so without needing a laboratory or technicians.