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Science News for December 14, 2008


Method sorts out double-walled carbon nanotube problem

Researchers at Northwestern University have developed a technique to produce double-walled carbon nanotubes with improved electrical conductivity, spatial resolution, and scanning lifetimes. The method uses density gradient ultracentrifugation to separate the nanotubes, resulting in longer DWNTs that outperform single-walled nanotubes.

SourceNorthwestern University·JournalNature Nanotechnology·DateDec 14, 2008

Step out for PAD

New research shows regular exercise can significantly improve peripheral artery disease (PAD) symptoms by increasing collateral blood flow and enhancing vascular efficiency. Exercise training can delay pain onset and increase mobility in people with PAD.

SourceWiley·JournalThe Journal of Physiology·DateDec 14, 2008

Brain background to body mass

A genetic study of over 90,000 people has identified six new genetic variants linked to increased Body Mass Index (BMI), indicating that many genetic variants implicated in obesity may affect behavior rather than energy or fat metabolism. The study suggests that the brain plays a crucial role in regulating body weight.

SourceWellcome Trust Sanger Institute·JournalNature Genetics·DateDec 14, 2008

More food at lower cost

A new study published in Nature Cell Biology has discovered a way to increase the length of root hairs on plants, potentially improving crop yields. This method enables plants to take up minerals and water more efficiently, reducing fertiliser waste and promoting sustainable food production.

SourceUniversity of Bristol·JournalNature Cell Biology·DateDec 14, 2008