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Science News for May 3, 2011


It's a jungle out there

A comprehensive study of 20th century children's books found a significant bias towards tales featuring men and boys as lead characters. The findings suggest that even when animal characters are involved, they tend to be male, perpetuating the underrepresentation of females in literature.

SourceSociologists for Women in Society·JournalGender & Society·DateMay 3, 2011

MIT: New system for flat-panel solar power combines with hot water systems for greater performance

Researchers at MIT have developed a new system for harnessing the sun's heat to generate electricity, producing power with an efficiency roughly eight times higher than previous devices. The system uses flat, stationary panels and eliminates the need for tracking systems, making it potentially less expensive to produce.

SourceMassachusetts Institute of Technology·JournalNature Materials·DateMay 3, 2011

Unlocking the metabolic secrets of the microbiome

A new study in Cell Metabolism reveals the microbiome's significant effects on metabolism in mice, highlighting butyrate as a primary energy source for colon cells. Butyrate levels have been linked to dietary and clinical implications, including colorectal cancer prevention.

SourceCell Press·JournalCell Metabolism·DateMay 3, 2011

Illinois professor chairs committee that recommends immediate calories, protein for TBI

A University of Illinois professor chaired a committee that recommends providing at least 50% of normal caloric intake, including higher protein, to reduce inflammation and promote brain repair in TBI patients. The guidelines aim to improve recovery rates for veterans and individuals with other traumatic brain injuries.

Peripheral venous catheters pose infection risk

A new study from Rhode Island Hospital estimates that over 1 in 10 catheter-related bloodstream infections due to Staph aureus in hospitalized adults are caused by infected peripheral venous catheters. The study highlights the substantial medical burden of complications from these infections.

SourceLifespan·JournalInfection Control and Hospital Epidemiology·DateMay 3, 2011

HIV drug could prevent cervical cancer

Researchers discovered that lopinavir selectively kills HPV-infected non-cancerous cells while leaving healthy cells relatively unaffected. The study suggests a potential treatment for HPV-related cervical cancer using locally applied lopinavir cream or pessary.

SourceUniversity of Manchester·JournalAntiviral Therapy·DateMay 3, 2011

Teen consumer patterns in China and Canada

A study published in the Journal of Business Research found that Chinese adolescents are heavily influenced by their parents, while Canadian teens are more likely to make independent decisions. Parenting practices and cultural values play a significant role in shaping teen outlooks and decision-making patterns.

SourceConcordia University·JournalJournal of Business Research·DateMay 3, 2011

Sense of justice built into the brain

A new study found that the brain has an automatic reaction to unfairness in financial fairness games, linked to increased amygdala activity. Targeting this region can reduce aggression and increase tendency to accept unfair distributions of money.

SourcePLOS·JournalPLOS Biology·DateMay 3, 2011

Controlling brain circuits with light

The invention of optogenetics enables scientists to control and observe brain circuits using genetically encoded molecules targeted by light. This technique reveals how entire neural circuits operate, allowing researchers to determine the roles of specific neurons in various behaviors and brain functions.

SourceFaculty of 1000·JournalF1000 Biology Reports·DateMay 3, 2011

Climate change analysis predicts increased fatalities from heat waves

Researchers at Johns Hopkins Bloomberg School of Public Health analyzed climate change scenarios to predict excess deaths per year attributable to heat waves. The study found that the city of Chicago could experience between 166 and 2,217 excess deaths per year due to heat waves, with mitigation efforts expected to reduce this impact.

SourceJohns Hopkins Bloomberg School of Public Health·JournalEnvironmental Health Perspectives·DateMay 3, 2011

UCLA scientists discover new way to wake up the immune system using nano vaults to deliver drugs

UCLA researchers have discovered a novel method to stimulate the immune system against lung cancer by delivering an immune-stimulating protein via nanoscale containers called vaults. The approach showed potent inhibition of cancer growth in pre-clinical studies and has the potential to be a game-changer in cancer immunotherapy.

Ranking research

Researchers have proposed a new approach to ranking the relevance of research papers using social bookmarking tools. The CiteRank algorithm combines similarity and static rankings to enhance search results. It was found that users preferred recent papers but also rated highly classic papers based on priority rating.

SourceInderscience Publishers·JournalInternational Journal of Internet Technology and Secured Transactions·DateMay 3, 2011

Robots learn to share, validating Hamilton's rule

Scientists used simple robots to test how altruism evolves over generations. The results matched Hamilton's rule, suggesting that helping relatives increases their chances of passing on genes. This study has implications for swarm robotics and the evolution of cooperation in nature.

SourcePLOS·JournalPLOS Biology·DateMay 3, 2011

Why the eye is better than a camera

Researchers discovered that the human eye's horizontal cells boost photoreceptor signals while preserving contrast, allowing for sharper images with less sacrifice of shadow detail. This positive feedback mechanism is found across vertebrates and is thought to be responsible for the eye's ability to detect faint details near edges.

SourcePLOS·JournalPLOS Biology·DateMay 3, 2011

Grazing as a conservation tool

A new study by the Wildlife Conservation Society found that rotational grazing techniques can benefit both cattle and wildlife in native pasturelands. The results show a greater forage base, producing larger, more valuable cattle while reducing incentives for deforestation and habitat loss.

SourceWildlife Conservation Society·JournalTropical Conservation Science·DateMay 3, 2011

Succulent plants waited for cool, dry Earth to make their mark

Researchers propose that a prolonged dry spell and lower atmospheric carbon dioxide levels drove the rise of cacti and other succulents, leading to rapid speciation between 5-10 million years ago. This coincided with species explosions in other plant groups, including C4 grasses, which burst onto the scene during the same time period.

SourceBrown University·JournalProceedings of the National Academy of Sciences·DateMay 3, 2011

World's smallest atomic clock on sale

Researchers at Sandia National Laboratories have developed a tiny atomic clock that is 100 times smaller and uses 100 times less power than its predecessors. The portable Chip Scale Atomic Clock (CSAC) has various specialized applications, including timing operations for miners and divers in deep-sea explorations.

How should systematic reviews consider evidence on harms?

A new study suggests that systematic reviews should evaluate a broad range of study designs, including randomized controlled trials and observational studies, to build a complete picture of potential harm. This approach may improve the generalizability of the review without loss of validity.

SourcePLOS·JournalPLOS Medicine·DateMay 3, 2011

Pistachios pummel pretzels as a weight-wise snack

A new study published in the Journal of the American College of Nutrition found that pistachio snackers had better success with supporting their body mass index (BMI) goals compared to those who snacked on pretzels. Pistachios also helped support heart health due to their high levels of healthy unsaturated fat.

SourceParamount Farms·JournalJournal of the American College of Nutrition·DateMay 3, 2011

Nature of bonding determines thermal conductivity

Phase change materials exhibit surprisingly low thermal conductivity in both crystalline and amorphous states. The researchers found that resonance bonding between atoms in the crystalline state impairs heat conduction. This property makes phase change materials suitable for developing fast, non-volatile, and energy-saving main memories.

SourceHelmholtz Association·JournalAdvanced Functional Materials·DateMay 3, 2011

Breast cancers found between mammograms more likely to be aggressive

A study published in the Journal of the National Cancer Institute found that breast cancers discovered between screening mammograms tend to be more aggressive and have a poorer prognosis. The research compared data from women with interval cancers (detected between mammograms) to those detected during routine screening.

SourceJournal of the National Cancer Institute·JournalJNCI Journal of the National Cancer Institute·DateMay 3, 2011

Genome duplication encourages rapid adaptation of plants

Researchers found that doubling a plant's chromosome set can grant it an immediate survival advantage in challenging environments. The experiment showed that hexaploid yarrow outperformed its tetraploid counterpart by five-fold, with the difference attributed solely to the increased chromosome number.

SourceUniversity of Rochester·JournalProceedings of the National Academy of Sciences·DateMay 3, 2011