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Science News for May 11, 2000


Nanofabricated 'gel' separates DNA

Researchers at Cornell University have developed a nanofabricated device that can separate DNA fragments by length in as little as 15-30 minutes, compared to the traditional method which takes 12-24 hours. The device uses alternating deep and shallow sections to propel DNA strands through it, allowing for faster separation and analysis.

SourceCornell University·JournalScience·DateMay 11, 2000

Ritalin and Prozac: Study finds more kids using both drug types together

A new study documents the increase in Ritalin-type stimulant drugs and Prozac-type antidepressants prescribed to children, raising concerns about diagnosis and treatment. Thirty percent of children on SSRIs also took stimulants, highlighting the need for further research on safety and effectiveness.

SourceMichigan Medicine - University of Michigan·DateMay 11, 2000

New fossils may be first human ancestors out of Africa, sayScienceauthors

A team of researchers has discovered two nearly complete fossil skulls from the Dmanisi site in Georgia, which may represent the first hominid species to migrate out of Africa. The fossils show clear signs of African ancestry and are dated to around 1.7 million years old.

SourceAmerican Association for the Advancement of Science (AAAS)·JournalScience·DateMay 11, 2000
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Wireless net may require 'smart antennas'

Future wireless devices may use multiple antennas to outperform single-antenna versions, reducing interference and increasing reception accuracy. This technology could enable three times as many users to operate within the same frequency band.

SourcePurdue University·DateMay 11, 2000

Study contradicts assumption that ulcer bug has always plagued humans

A new study contradicts the long-held assumption that the Helicobacter pylori bacterium has been with humans forever. Researchers analyzed DNA from over 500 strains from five continents and found that strains from Peru resemble those from Spain, not those from eastern Asia.

SourceWashU Medicine·JournalJournal of Bacteriology·DateMay 11, 2000

Undergraduates' invention makes guns childproof

Student engineers at Johns Hopkins University designed a low-tech, affordable childproofing device for handguns that can be defeated by adults but not young children. The device automatically switches the gun back to safe mode when it leaves an adult's hand, providing passive protection.

SourceJohns Hopkins University·DateMay 11, 2000
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