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Science News for July 26, 2011


Social networking elephants never forget

Researchers tracked female Asian elephant friendships for five seasons in Sri Lanka's Uda Walawe National Park, finding that elephants tend to congregate in groups of three adult females. Analysis revealed a larger, stable network of friends, with those having few companions being more loyal than those with many.

SourceBMC (BioMed Central)·JournalBMC Ecology·DateJul 26, 2011

Progress on research of polymer solar cells

Scientists have designed a new type of polymer solar cell that can effectively tune its band gap and energy levels by incorporating different acceptor groups. The resulting polymers exhibit promising photovoltaic properties, with high open-circuit voltages achieved despite their varying band gaps.

How the modular structure of proteins permits evolution to move forward

A comparative study of nematode species reveals that changes in a short protein domain can alter signaling networks involved in organ development. The modular structure of proteins allows for the conservation of important parts while enabling opportunities for short domains to change, facilitating evolutionary development.

SourcePLOS·JournalPLOS Biology·DateJul 26, 2011

Models show Coho salmon at risk in US urbanizing watersheds

Researchers used models to estimate the impact of urban land development on Coho salmon populations, predicting a significant decline in numbers due to spawner mortality syndrome. The study suggests that toxic chemical contaminants in urban storm water runoff may be the primary cause of the recurrent fish kills.

SourceWiley·JournalIntegrated Environmental Assessment and Management·DateJul 26, 2011

Sea squirt cells shed light on cancer development

A research team led by Bradley Davidson discovered that specialized structures in sea squirt cells, called invadopodia, may help cancer cells evade elimination processes. In contrast to cancer cells, sea squirt cells use these structures to pick up chemical signals for development, not invasion.

SourceUniversity of Arizona·JournalNature Cell Biology·DateJul 26, 2011

College-educated undocumented young adults face same narrow range of jobs as their parents

A survey of undocumented young adults raised and educated in America found that they end up working in the same labor jobs as their parents, despite having a college education. The study highlights the challenges faced by these individuals due to their lack of legal status, which limits their career options and daily lives.

SourceUniversity of Washington·JournalAmerican Sociological Review·DateJul 26, 2011

Spare the rod and develop the child

A new study published in Social Development journal found that schools using corporal punishment performed worse on tasks requiring planning and self-control. Children exposed to punitive environments had lower verbal intelligence and increased behavioral problems related to executive-functioning deficits.

SourceUniversity of Toronto·JournalSocial Development·DateJul 26, 2011

Quality of life for children with ADHD and their families worsens with greater disease severity

A study by Baylor University found that children with ADHD treated in psychiatric clinics have significantly worse health-related quality of life and family functioning than those treated by general pediatricians. The study highlights the importance of evaluating both children's and parents' perspectives on quality of life.

SourceBaylor University·JournalJournal of Attention Disorders·DateJul 26, 2011

Reforestation's cooling influence -- a result of farmer's past choices

A new study suggests that reforestation on abandoned agricultural land can have a significant cooling effect on the climate. By considering historical patterns of land-use conversion, researchers found that farmers generally chose to use more productive and snow-free lands, which can absorb more carbon dioxide and reduce global warming.

SourceCarnegie Institution for Science·JournalGeophysical Research Letters·DateJul 26, 2011

Adrenaline use in cardiac arrest

A randomized double-blind placebo-controlled trial found that adrenaline increased the likelihood of restoring circulation following cardiac arrest, but no difference was seen in survival to hospital discharge. The study provides the best evidence to date supporting the use of adrenaline in treating cardiac arrest.

SourceElsevier·JournalResuscitation·DateJul 26, 2011

Treating obesity via brain glucose sensing

A study published in PLOS Biology found that a defect in brain glucose sensing contributes to obesity, while correction of this defect can treat the condition. The researchers discovered a novel role for hypoxia-inducible factor (HIF) in hypothalamic glucose sensing and whole-body energy balance regulation.

SourcePLOS·JournalPLOS Biology·DateJul 26, 2011

Testing fumigant films that keep the air clean

Researchers have developed a way to help growers reduce fumigant emissions by testing the permeability of dozens of films used to cover treated soil. They found that some films are better barriers to fumigant diffusion than others, but their effectiveness varies depending on the fumigant and weather conditions.

Evidence shows NTD control can help in the fight against HIV/AIDS

The article highlights the connection between neglected tropical diseases (NTDs) and HIV/AIDS, proposing ways to integrate NTD treatment programs with HIV/AIDS initiatives. Studies show that areas with high NTD infection rates also have high HIV/AIDS prevalence, and co-infections can exacerbate HIV/AIDS.

SourcePLOS·JournalPLOS Neglected Tropical Diseases·DateJul 26, 2011

Local efforts can stem the increasing unnecessary cesarean sections

A systematic review found that nurse-led relaxation classes, birth preparation classes, and clinician feedback can decrease caesarean sections in low-risk pregnancies. However, prenatal education, computer patient decision-aids, and insurance reform have not shown significant effects on reducing cesarean section rates.

SourceWiley·JournalCochrane Database of Systematic Reviews·DateJul 26, 2011