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Science News Archive July 2010 - Page 9


Page 9 of 23

Temperature constancy appears key to tropical biodiversity

A new study reveals that consistent year-round temperatures in the tropics, rather than higher temperatures or more sunlight, are key to its stunning biodiversity. The research suggests that the world is likely less diverse today than it was tens of millions of years ago, when the entire Earth had consistent year-round temperatures.

SourceHarvard University·JournalPaleobiology·DateJul 20, 2010

Drug users must be decriminalized along with scale-up of combination treatment and changes to drug control and law enforcement

Experts call for decriminalization of drug users, alongside a massive scale-up of opioid substitution, needle and syringe programs, and antiretroviral treatment. Current treatment programmes only reach around 10% of people who use drugs worldwide, highlighting the need for reform in justice systems and policy decision making.

SourceThe Lancet_DELETED·JournalThe Lancet·DateJul 20, 2010

Why does everything look gray when you feel blue?

Researchers found that people with depression have difficulty detecting black-and-white contrast differences in their retina. The study used a pattern electroretinogram to measure retinal responses in patients with depression and healthy individuals, revealing dramatically lower contrast gain in depressed patients.

SourceElsevier·JournalBiological Psychiatry·DateJul 20, 2010

6 new research units established

The Deutsche Forschungsgemeinschaft is setting up six new Research Units to facilitate transregional and interdisciplinary cooperation among researchers. The new networks focus on topics such as neurophysiological processes, correlated solids, the Mamluk era, combustion processes and climate change.

Data presentation and consumer confidence

A recent study found that data presented in frequency format elicits higher confidence and more accurate conclusions in consumers. In contrast, percentages appear easier for consumers to understand, but may lead to averaging errors. The results have practical implications for regulators trying to discourage smoking behavior.

SourceUniversity of Chicago Press Journals·JournalJournal of Consumer Research·DateJul 20, 2010

Cellulose: Hard to digest, but full of energy

Researchers at Max Planck Institute identify CSI1 protein involved in cellulose synthesis, linked to improved cell wall digestibility and energy generation. The discovery aims to increase animal feed efficiency and tap into plant cell walls as a renewable energy source.

SourceMax-Planck-Gesellschaft·JournalProceedings of the National Academy of Sciences·DateJul 20, 2010

Alcohol: The forgotten drug in HIV/AIDS

A new study finds that hazardous alcohol consumption is linked to increased HIV infection rates in Southern and Eastern Africa. Venue-based interventions have been shown to be effective in changing individual behavior and social norms, but more research is needed to address the gender gap in these programs.

SourceThe Lancet_DELETED·JournalThe Lancet·DateJul 20, 2010

Schools safer, discipline worse

Research by Professor Aaron Kupchik finds that schools are safer than ever, yet disciplinary practices continue to be overly aggressive and ineffective. He recommends alternatives such as removing police from schools and involving students in the rule-making process to promote safety and well-being.

Where the wild veggies are

Researchers have found that the wild populations giving rise to melons and cucumbers originated in Asia, contrary to previous assumptions. The study analyzed genetic material from over 100 species of Cucumis, revealing a close living relative of the cultivated melon is native to Australia.

SourceLudwig-Maximilians-Universität München·JournalProceedings of the National Academy of Sciences·DateJul 20, 2010

Liverpool scientists construct molecular 'knots'

Researchers at the University of Liverpool construct molecular 'knots' with dimensions of around two nanometers, using a process called self-assembly to mechanically bond interpenetrating loops. The discovery has potential applications in building molecular machines to trap harmful gases and pollutants.

SourceUniversity of Liverpool·JournalNature Chemistry·DateJul 20, 2010

HIV testing for children must be improved

Children account for 18% of HIV-related deaths and 15% of infections annually, highlighting the need for improved testing. New approaches, such as routine newborn testing, could help detect more children with HIV in resource-limited settings.

SourcePLOS·JournalPLOS Medicine·DateJul 20, 2010

Dairy farmers can fight growing disease threat with chlorine and stainless steel

USDA researchers found that using stainless steel water troughs with chlorinated water significantly reduces the survival of Johne's disease-causing bacteria. Chlorine is particularly effective in killing the bacteria on stainless and galvanized steel surfaces, but has limited impact on concrete and plastic.

UCLA scientists isolate the first stages of tissue production in human embryonic stem cells

Researchers have isolated the first stage of tissue production in human embryonic stem cells, marking a significant breakthrough in regenerative medicine. The discovery may lead to the development of safer tissues for use in treating various medical conditions, including leukemia and sickle cell anemia.

SourceUniversity of California - Los Angeles Health Sciences·JournalProceedings of the National Academy of Sciences·DateJul 20, 2010

What causes hybrid vigor?

Researchers found that genetic variation, known as gene expression noise, can lead to increased vigour in species hybrids. This study provides a new explanation for hybrid vigor, covering both natural and domesticated varieties.

SourcePLOS·JournalPLOS Biology·DateJul 20, 2010

New test to predict success of IVF treatment developed at Stanford

A new test developed at Stanford University School of Medicine predicts the outcomes of a subsequent round of IVF for women who have already gone through a cycle. The test is 1,000 times more accurate than current age-based guidelines and provides personalized predictions based on clinical data from prior failed treatments.

SourceStanford Medicine·JournalProceedings of the National Academy of Sciences·DateJul 19, 2010

'The friend of my enemy is my enemy'

A new study analyzing interactions between players in a virtual universe game has provided large-scale evidence to prove an 80-year-old psychological theory called Structural Balance Theory. The research shows that individuals tend to avoid stress-causing relationships when they develop a society, resulting in more stable social networks.

SourceImperial College London·JournalProceedings of the National Academy of Sciences·DateJul 19, 2010

Frog killer caught in the act

A study published in the Proceedings of the National Academy of Sciences reveals that a fungal disease has decimated amphibian abundance and species diversity in Central America's highlands. The researchers used DNA barcoding to estimate the impact of the epidemic, discovering five new species were also lost.

SourceSmithsonian Tropical Research Institute·JournalProceedings of the National Academy of Sciences·DateJul 19, 2010