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Science News for June 28, 2010


Study challenges long-held assumption about competition in disturbed ecosystems

A laboratory study of microscopic organisms subjected to varying degrees of acoustic disturbance shows that competition can be a factor in regulating ecological communities regardless of the intensity or frequency of disturbance. The findings contradict the intermediate disturbance hypothesis, suggesting that there is a strong trade-of...

SourceGeorgia Institute of Technology·JournalProceedings of the National Academy of Sciences·DateJun 28, 2010

Is this the perfect prawn?

CSIRO scientists have developed an improved Black Tiger prawn breed using DNA technology, resulting in record yields of up to 24.2 tonnes per hectare. This breakthrough has the potential to revolutionize the Australian prawn farming industry and increase production from 5,000 tonnes to 12,500 tonnes by 2020.

Memory problems not the only predictor of later mild cognitive impairment

A study published in the Journal of the International Neuropsychological Society found that lower performance on tests measuring learning and processing speed, as well as symptoms of depression, predicted subsequent cognitive decline in a normal population. The researchers used advanced statistical methodology to analyze multiple varia...

SourceRush University Medical Center·JournalJournal of the International Neuropsychological Society·DateJun 28, 2010

Harvard's Wyss Institute develops technology to produce sugar from photosynthetic bacteria

Researchers at Harvard's Wyss Institute have engineered photosynthetic bacteria to produce simple sugars and lactic acid, offering a sustainable alternative for producing commodity chemicals. This innovation could lead to reduced carbon dioxide emissions and greater availability of biodegradable plastics.

SourceWyss Institute for Biologically Inspired Engineering at Harvard·JournalApplied and Environmental Microbiology·DateJun 28, 2010

Reading the look of love

Researchers discovered that volunteers could rapidly assess whether a face was looking at them if it had exaggerated masculine or feminine features. Women were quicker to classify gaze direction when viewing more masculine faces, while men were faster with feminine faces.

SourceAssociation for Psychological Science·JournalPsychological Science·DateJun 28, 2010

Lower back pain and surgery

A literature review suggests that surgery is not the first line of treatment for low back pain caused by herniated disks, and that alternative options such as physical therapy and medications can provide relief. The review also found that patients with larger herniations are more likely to experience a recurrence of pain after surgery.

SourceAmerican Academy of Orthopaedic Surgeons·JournalJournal of the American Academy of Orthopaedic Surgeons·DateJun 28, 2010

Virus 'explorers' probe inner workings of the brain

Princeton University researchers are developing a new method for studying brain connectivity using genetically engineered viruses. The viruses, designed by Lynn Enquist's team, travel through the nervous system, tracing connections between neurons and reporting on their activity. This approach has significant implications for understan...

York U study finds better way to battle mosquitoes

A York University study found that leaving organic debris in catch basins improves the effectiveness of S-methoprene in controlling mosquito larvae. The researchers discovered that S-methoprene binds to organic material, making it more effective when left in the catch basins.

SourceYork University·JournalJournal of the American Mosquito Control Association·DateJun 28, 2010

Dark chocolate lowers blood pressure

Researchers found that consuming dark chocolate can significantly reduce systolic blood pressure by 5mmHg, comparable to 30 minutes of moderate exercise. This effect is most pronounced in individuals with high blood pressure, potentially reducing the risk of cardiovascular events by 20% over five years.

SourceBMC (BioMed Central)·JournalBMC Medicine·DateJun 28, 2010

Memories are made of this

A new study led by the University of Leicester has revealed the mechanism by which memories are formed, highlighting the importance of the M3-muscarinic receptor in this process. The research, funded by the Wellcome Trust, holds potential to impact drug design for treating Alzheimer's disease.

SourceUniversity of Leicester·JournalProceedings of the National Academy of Sciences·DateJun 28, 2010

Can one-time tillage improve no-till?

A five-year study found that one-time tillage did not negatively impact grain yield or soil structure in no-till crops. However, it may help manage perennial weeds and reduce phosphorus stratification. The researchers concluded that tilling should only be done to address specific problems, as it increases erosion risk.

SourceAmerican Society of Agronomy·JournalAgronomy Journal·DateJun 28, 2010

Making 'virtopsies' a reality

A new research project at the University of Leicester aims to develop a reliable and cost-effective system for diagnosing coronary heart disease using CT scans. The technology will enable visualisation of coronary arteries in cadavers, making diagnoses comparable to current autopsy practice.

Mystery unraveled: How asbestos causes cancer

Researchers discovered that asbestos exposure leads to the release of high-mobility group box 1 protein (HMGB1), which promotes tumor growth and inflammation. Elevated levels of HMGB1 in patients exposed to asbestos may enable simple serological testing to identify at-risk individuals.

SourceUniversity of Hawaii at Manoa·JournalProceedings of the National Academy of Sciences·DateJun 28, 2010

Toddler foods too sweet

A recent study by University of Calgary professor Charlene Elliott found that 53% of baby and toddler foods have excessive sugar content, with over half meeting the criteria for poor nutritional quality. The study also revealed a 'halo effect' in adult perceptions of these products, highlighting the need to carefully examine ingredient...

SourceUniversity of Calgary·JournalJournal of Public Health·DateJun 28, 2010

The image in the mirror and the number on the scale both count

A new study published in the Journal of Health and Social Behavior found that adolescent girls who perceive themselves as overweight but have a healthy weight are more likely to experience depressive symptoms than those with actual obesity. Additionally, underweight boys are also at high risk for distress. The researchers suggest that ...

SourcePenn State·JournalJournal of Health and Social Behavior·DateJun 28, 2010

Molecular biology provides clues to health benefits of olive oil

A study published in Biomed Central (BMC) Genomics found that high-phenolic-content olive oil modifies genes involved in the inflammatory response, potentially reducing heart disease risk. The researchers tracked gene expression in blood cells after consuming two virgin olive oil-based breakfasts with varying phenolic compound content.

Bees help to beat MRSA bugs

Researchers at the University of Strathclyde found that a substance called beeglue, originating from beehives in the Pacific region, was active against MRSA. The study isolated two compounds, Propolin C and Propolin D, which showed good activity against all MRSA strains tested.

SourceUniversity of Strathclyde·JournalPhytotherapy Research·DateJun 28, 2010

International study identifies 12 new genetic risk factors for type 2 diabetes

An international consortium of scientists has identified 12 new gene variants linked to type 2 diabetes, with 11 influencing insulin production and one associated with the X chromosome. This discovery sheds light on the complex pathogenesis of the disease, which affects millions worldwide.