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Science News for November 24, 2008


Health care reform: No revolution in sight

A new study of 21 countries reveals that public attitudes toward government involvement in health care vary widely, but ultimately support a role for the state in ensuring access. The findings suggest that any major overhaul of health care systems is unlikely due to cultural and historical factors.

SourceIndiana University·JournalJournal of Health and Social Behavior·DateNov 24, 2008

Putting a green cap on garbage dumps

Growing plants and trees on landfills can reduce greenhouse gas emissions by four to five times. Phytocapping also cuts the cost of landfill remediation in half and provides biodiversity corridors. The technique uses a layer of top soil and dense vegetation to trap methane and water.

SourceInderscience Publishers·JournalInternational Journal of Environmental Technology and Management·DateNov 24, 2008

Phycology in China

Phycologists and algal biotechnologists in China are addressing pressing issues in algae research, including resource exhaustion and environmental impact. The country's largest seaweed cultivation industry has become a crucial driver of innovation and growth in the field.

Mineral oil contamination in humans: A health problem?

The presence of mineral oil in edible oils and foods exceeds recommended safety limits, raising concerns about human health. Analytical campaigns are underway to address this issue and provide toxicological data for improved safety evaluation.

SourceWiley·JournalEuropean Journal of Lipid Science and Technology·DateNov 24, 2008

Mothers' mental games increase depressive symptoms in daughters

A new study found that African American adolescent girls whose mothers used psychological control, such as guilt trips and withdrawn affection, reported higher levels of depressive symptoms. In contrast, boys showed no such effect. The researchers suggest a need for parents to strike a balance between giving children autonomy and guidi...

SourceWiley·JournalFamily Relations·DateNov 24, 2008

Milagro detects cosmic ray hot spots

The Milagro collaboration has discovered two nearby regions with an unexpected excess of cosmic rays, suggesting the presence of high-energy particle acceleration near Earth. This finding is the second recent study indicating a source of galactic cosmic rays relatively close to our planet.

SourceUniversity of Maryland·JournalPhysical Review Letters·DateNov 24, 2008

Superglue from the sea

Researchers at the University of Utah have developed a synthetic version of sandcastle worm glue, which has shown promise in repairing shattered bone fragments. The glue performs 37% as well as commercial superglue in lab tests and may be used to align small bone fragments in joints and the face before they heal.

Ameobas: Keeping it in the family

In a breakthrough study, researchers discovered that social amoebas form multi-cellular organisms with genetically similar 'kin' to ensure survival. By aggregating based on genetic similarity rather than true kinship, cells can increase their chances of reproducing and passing on their genes.

SourcePLOS·JournalPLOS Biology·DateNov 24, 2008

Prion switching in response to environmental stress

In response to environmental stress, yeast cells trigger a protein-misfolding mechanism that reveals hidden genetic variation, allowing them to adapt and evolve rapidly. This 'prion switching' enables cells to digest previously inaccessible materials, such as certain nutrients and antibiotics, without prior genetic mutation.

SourcePLOS·JournalPLOS Biology·DateNov 24, 2008

Growth hormone not beneficial for ALS

A new study published in Neurology found that growth hormone insulin-like growth factor-1 (IGF-1) does not slow the progression of weakness in amyotrophic lateral sclerosis (ALS). The two-year study involved 330 people with ALS and found no difference in muscle strength between those taking IGF-1 and placebo, as well as no differences ...

SourceAmerican Academy of Neurology·JournalNeurology·DateNov 24, 2008

Research consortium to sequence turkey genome

The turkey genome will be assembled using shotgun fragments and paired-end reads, providing benefits for researchers studying commercially important sources of food. The project aims to sequence over 95% of the turkey genome, offering tools for improving commercial breeds and understanding disease development.

Stomach ulcer bug causes bad breath

A recent study discovered that Helicobacter pylori bacteria can be found in the mouths of people with halitosis without showing signs of stomach disease. The researchers found a significant association between the presence of H. pylori and periodontal disease, which is also a cause of bad breath.

SourceMicrobiology Society·JournalJournal of Medical Microbiology·DateNov 24, 2008

Bacterial biofilms as fossil makers

A team of scientists found that bacterial biofilms can completely replace embryo cell structure, generating a faithful replica of the embryo. The bacteria consume and replace all cytoplasm in cells, creating a detailed model of the embryo.

SourceIndiana University·JournalProceedings of the National Academy of Sciences·DateNov 24, 2008

COPI complex is a regulator of lipid homeostasis

Researchers identify COPI complex as a regulator of lipid homeostasis, finding it reduces PAT protein expression at the lipid droplet surface. This study reveals COPI's role in energy storage and shedding, with implications for treating obesity and metabolic disorders.

SourcePLOS·JournalPLOS Biology·DateNov 24, 2008

Transporting broiler chickens could spread antibiotic-resistant organisms

Researchers found increased levels of pathogenic bacteria on surfaces and in the air inside cars behind trucks carrying broiler chickens. The study, published in the Journal of Infection and Public Health, suggests a real exposure potential for antibiotic-resistant organisms, particularly during summer months when windows are open.

SourceJohns Hopkins Bloomberg School of Public Health·JournalJournal of Infection and Public Health·DateNov 24, 2008

Ocean growing more acidic faster than once thought

A new study reveals ocean acidification is occurring at a rate 10 times faster than previously predicted, posing severe threats to marine food webs and species diversity. The increasing acidity of the ocean harms certain sea animals and could reduce its ability to absorb carbon dioxide.

SourceUniversity of Chicago·JournalProceedings of the National Academy of Sciences·DateNov 24, 2008

Robo-lizards help prove long-standing signaling theory

Researchers using robotic lizards in Puerto Rico's forests showed that animals can use visual displays to grab their neighbors' attention before initiating more information-rich performances. Pushups and rapid dewlap extensions prompted neighboring lizards to orient themselves more quickly, confirming a nearly 30-year-old hypothesis.

SourceUniversity of California - Davis·JournalProceedings of the National Academy of Sciences·DateNov 24, 2008

Scientists discover 21st century plague

Researchers found that brown rats in Europe carry several pathogenic species of Bartonella bacteria, including B. elizabethae, which can cause heart disease in humans. The study raises concerns about the existence of other reservoirs and vectors for this emerging infection.

SourceMicrobiology Society·JournalJournal of Medical Microbiology·DateNov 24, 2008

Mystery of missing hydrogen

A team of Australian astronomers discovered a puzzling lack of hydrogen gas in distant galaxies, which contradicts expectations based on the Universe's life cycle. The observed absence may be due to the destruction of hydrogen by quasars' intense radiation, leaving behind only ionised particles.

SourceUniversity of New South Wales·JournalMonthly Notices of the Royal Astronomical Society·DateNov 24, 2008

TV: Not the only channel to early sex

A study of 273 adolescents found that those who had early sex were more likely to have lower academic achievement, depression, ADHD, and ODD. Parents' positive influence was also shown to reduce risky sexual behavior during adolescence.

SourceSpringer·JournalJournal of Youth and Adolescence·DateNov 24, 2008

Peer-led sex education does not reduce abortions among teenagers

A study published in PLOS Medicine found that peer-led sex education in English schools did not reduce teenage abortions, but pupils preferred the approach. The trial involved 9,000 students and showed no significant difference in abortion rates between peer-led and teacher-led sessions at age 20.

SourcePLOS·JournalPLOS Medicine·DateNov 24, 2008

Bittersweet milestones

A recent study found that nearly a quarter of centenarians (25%) exhibit clinically relevant levels of depressive symptoms, yet only 8% receive an official diagnosis. Poor nutritional status, urinary incontinence, and past history of anxiety are potential contributing factors.

Boosting the power of solar cells

Researchers at MIT have developed a new method for boosting the efficiency of solar photovoltaic cells by up to 50%. By applying antireflection coatings and complex reflective layer designs, they were able to increase the energy conversion rate. This breakthrough has significant implications for the future of renewable energy and could...

New study finds publication bias among trials submitted to FDA

A recent study published in PLOS Medicine found that a quarter of submitted drug trials remain unpublished five years later. Trials with favorable outcomes were more likely to be published, while those without favorable outcomes often had outcomes omitted or altered to favor the test drug.

SourcePLOS·JournalPLOS Medicine·DateNov 24, 2008

Scripps Florida scientists find blocking a neuropeptide receptor decreases nicotine addiction

Researchers at Scripps Florida found that blocking hypocretin-1 receptors significantly decreased nicotine self-administration and motivation in rats, suggesting a potential target for developing new smoking cessation treatments. The study highlights the importance of hypocretin-1 receptors in regulating nicotine reward and motivation.

SourceScripps Research Institute·JournalProceedings of the National Academy of Sciences·DateNov 24, 2008

Race bigotry falling in Britain

A new study finds that racial prejudice in Britain has been declining since the 1980s, with younger generations showing greater tolerance towards ethnic minorities. The study also reveals significant generational changes in attitudes, with women and more educated individuals expressing less prejudice.

SourceUniversity of Manchester·JournalBritish Journal of Sociology·DateNov 24, 2008

Inherited genetic cause, possible treatment found for complex lung disorder

A Cincinnati Children's study identifies a familial genetic cause for Pulmonary Alveolar Proteinosis (PAP), a lung disease causing labored breathing and respiratory failure. The research team proposes an inhaled GM-CSF aerosol as a potential treatment to correct surfactant levels, offering new hope for patients suffering from the condi...

SourceCincinnati Children's Hospital Medical Center·JournalJournal of Experimental Medicine·DateNov 24, 2008

Springer launches Food Security

The new journal covers the principles and practice of food security, analyzing it from various disciplines. It aims to define constraints preventing one billion people from accessing adequate nutrition and address means to overcome them.

SourceSpringer·JournalFood Security·DateNov 24, 2008

Health study in northern Uganda calls for improved services for internally displaced persons

A cross-sectional survey in northern Uganda found that IDPs experience negative effects on physical and mental health due to factors like gender, age, income, distance from home areas, food security, and sense of safety. The study also highlights the importance of emotional support using family ties for better mental health.

SourceLondon School of Hygiene & Tropical Medicine·JournalJournal of Epidemiology and Community Health·DateNov 24, 2008

Study identifies double-balloon enteroscopy as cost-effective approach for obscure GI bleeding

Double-balloon enteroscopy is a cost-effective approach for patients with obscure gastrointestinal bleeding, offering reduced costs and complications compared to other diagnostic methods. The study suggests that an initial capsule-directed double-balloon enteroscopy may be preferred over other options due to its potential for fewer com...

SourceAmerican Society for Gastrointestinal Endoscopy·JournalGastrointestinal Endoscopy·DateNov 24, 2008

Scientists shed light on evolution of gene regulation

Researchers at Penn State have discovered that not all DNA segments bound to the GATA1 protein are conserved across mammals, challenging previous assumptions. They found that 45% of these segments retain their identical form in other species, suggesting purifying selection maintains most regulatory regions.

SourcePenn State·JournalGenome Research·DateNov 24, 2008