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Science News for May 5, 2014


Genetic, environmental influences equally important risk for autism spectrum disorder

A large family study found that genetic relatedness in families increases the risk of autism spectrum disorder, while unique environmental factors also play a significant role. The study used a population-based sample of over two million Swedish children and revealed a strong link between genetic and environmental influences.

Strong institutions reduce in-group favoritism

A forthcoming study suggests that strong social and political institutions can reduce favoritism towards one's own group, making people more likely to follow impartial rules. Ineffective institutions, on the other hand, lead to favoritism towards local communities.

SourceCIFAR·JournalHuman Nature·DateMay 5, 2014

History to blame for slow crop taming: Study

Researchers found that crop domestication took much longer than expected, with cultural and historical factors playing a key role. Domesticated crops like corn showed traits such as seed resistance and shortened flowering times, but their adaptation was slower than genetic changes.

SourceUniversity of Guelph·JournalProceedings of the National Academy of Sciences·DateMay 5, 2014

Focused ultrasound reduces cancer pain

A phase III clinical trial shows that non-invasive magnetic resonance guided focused ultrasound treatment relieves pain and improves function for most patients with bone metastases. Patients responded well to treatment, with 64 percent experiencing either no pain or a significant reduction in their pain within several days of treatment.

SourceThomas Jefferson University·JournalJNCI Journal of the National Cancer Institute·DateMay 5, 2014

How does stress increase your risk for stroke and heart attack?

Researchers investigated the neural circuitry behind stress and heart disease, finding that negative emotions increase pro-inflammatory chemicals in the body. Individuals who struggled to regulate their emotions showed elevated blood levels of inflammatory cytokines and atherosclerosis markers.

SourceElsevier·JournalBiological Psychiatry·DateMay 5, 2014

Getting to the root of enamel evolution

A new study published in the Journal of Human Evolution identifies two genes that show evidence of positive selection in humans, contributing to the thickening of enamel. The research suggests that natural selection played a key role in shaping human teeth, with specific genetic changes linked to diet and environmental pressures.

SourceDuke University·JournalJournal of Human Evolution·DateMay 5, 2014

Where DNA's copy machine pauses, cancer could be next

Researchers at Duke University mapped fragile sites across the entire yeast genome, finding they occur in areas where DNA replication slows or stalls. These sites are linked to genetic abnormalities seen in solid tumors and can lead to chromosome instability.

SourceDuke University·JournalProceedings of the National Academy of Sciences·DateMay 5, 2014

What fuels Salmonella's invasion strategy?

Research discovered that glucose is the major nutrient used by Salmonella bacteria, but it's also able to use other nutrients. This finding informs potential therapeutic interventions to combat Salmonella infections. The study reveals a wealth of strategies employed by Salmonella to overcome host defenses and evade immune systems.

SourceNorwich BioScience Institutes·JournalPLOS ONE·DateMay 5, 2014

A journey between XX and XY

Researchers at UNIGE identified a mutation in the HHAT gene, which plays a key role in embryonic development and affects sexual development, growth, and skeletal development. The study provides new insights into Hedgehog signaling and has implications for genetic testing and treatment of patients with disorders of sex development.

SourceUniversité de Genève·JournalPLOS Genetics·DateMay 5, 2014

Annals of Internal Medicine tip sheet for May 6, 2014

A study published in Annals of Internal Medicine found that Massachusetts' comprehensive health care reform led to a significant decline in deaths, particularly among nonelderly residents. The researchers estimated that the reform prevented 320 deaths per year and saved one life for every 830 persons gaining insurance. Additionally, th...

SourceAmerican College of Physicians·JournalAnnals of Internal Medicine·DateMay 5, 2014

New knowledge about muscular dystrophy

Researchers at Aarhus University discovered that enzyme DDX6 regulates toxic RNA aggregates in muscular dystrophy patients. The study found that increasing DDX6 levels reduces RNA aggregates, while decreasing them leads to more aggregates.

SourceAarhus University·JournalNucleic Acids Research·DateMay 5, 2014

Spotting a famous face in the crowd

A study by Volker Thoma found that humans can only process a few faces at a time, whether they are familiar or not. This limits our ability to recognize faces in crowded spaces. The study used famous faces like Bill Clinton and Mick Jagger to test this theory.

SourceSpringer·JournalPsychonomic Bulletin & Review·DateMay 5, 2014

Is self-fumigation for the birds?

Researchers discovered that finches in the Galapagos Islands use treated cotton to kill parasitic fly maggots, protecting baby birds and potentially helping endangered species. The biologists tested this self-fumigation method on Darwin's finches, showing that it is effective against the nest fly Philornis downsi.

SourceUniversity of Utah·JournalCurrent Biology·DateMay 5, 2014

Genetic approach helps design broadband metamaterial

Researchers at Penn State have developed a new metamaterial with high absorption over broad bandwidth, providing better protection against electromagnetic radiation. The material is designed using genetic algorithms and can be easily manufactured due to its simple layer structure.

SourcePenn State·JournalACS Nano·DateMay 5, 2014

A symbiotic way of life

University of Miami researchers found that an amino acid transporter regulates glutamine supply to symbiotic bacteria in pea aphids, enabling the exchange of essential nutrients. This simple mechanism allows the insect-bacteria partnership to adapt to changing demand for nutrients.

SourceUniversity of Miami·JournalProceedings of the National Academy of Sciences·DateMay 5, 2014

When wine hits the right nerve

Researchers at Ruhr-University Bochum decode mechanism for appreciation of the barrique character, a bitter sensation on the tongue. They found that gallic acid groups are responsible for triggering this sensation, which is mediated by the trigeminal nerve.

SourceRuhr-University Bochum·JournalChemical Senses·DateMay 5, 2014

Groovy turtles' genes to aid in their rescue

A USGS study identifies four genetically distinct populations of diamondback terrapins, shedding light on the species' conservation needs. The research aims to develop targeted conservation plans, including habitat protection and migration corridors, to maintain genetic diversity and support the terrapin's overall population numbers.

SourceU.S. Geological Survey·JournalConservation Genetics·DateMay 5, 2014

Light-sensitive 'eyes' in plants

Researchers have studied phytochromes, proteins that detect light and inform plant cells whether it is day or night. The discovery increases understanding of these proteins and may lead to new strategies for developing more efficient crops that can grow in low-light conditions.

SourceUniversity of Gothenburg·JournalNature·DateMay 5, 2014

Science finds wines' fruity flavors fade first

A recent study from Washington State University challenges conventional wisdom on wine flavor finish. Researchers found that fruity flavors disappear from the palate earlier than oaky, floral, and earth flavors perception. This discovery sheds new light on the complex relationship between taste, aroma, and flavor in wine.

SourceWashington State University·JournalFood Quality and Preference·DateMay 5, 2014

Terahertz imaging on the cheap

Researchers at MIT describe a new technique that could reduce the number of sensors needed for terahertz or millimeter-wave imaging by a factor of 10, enabling more practical high-resolution imaging systems. The technique exploits the sparsity of scenes in certain ranges, allowing for efficient reconstruction without aliasing.

SourceMassachusetts Institute of Technology·JournalIEEE Transactions on Antennas and Propagation·DateMay 5, 2014

Caring for horses eases symptoms of dementia

People with Alzheimer's experience a clear improvement in dementia-related behavior after visiting horses under supervision, with reduced fidgeting and resistance to care. The therapy boosts physical activity and lifts their mood, providing a unique way to ease symptoms without drugs.

SourceOhio State University·JournalAnthrozoös·DateMay 5, 2014