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Science News for December 16, 2013


2 in 3 13-year-old girls afraid of gaining weight

New research found that six in ten 13-year-old girls are afraid of gaining weight or getting fat, with one in three girls and one in five boys avoiding fatty foods. The study also revealed that unhealthy weight-control strategies can lead to higher odds of being overweight and obese at age 15.

SourceUniversity of Bristol·JournalJournal of Adolescent Health·DateDec 16, 2013

Ear acupuncture can help shed the pounds

A recent study found that ear acupuncture using five points may be more effective in reducing midriff bulge than single-point stimulation. The treatment led to significant reductions in BMI and waist circumference after four weeks, with the most notable effects seen in the group using the five-point approach.

SourceBMJ Group·JournalAcupuncture in Medicine·DateDec 16, 2013

Elite technology for gene silencing

Researchers at Mirimus Inc. developed a new technology to enhance RNA interference efficiency and accuracy, enabling functional gene annotation in normal homeostasis and disease. The new approach uses an optimized microRNA backbone to increase the success rate of RNAi screens and models.

SourceMirimus Inc.·JournalCell Reports·DateDec 16, 2013

Recognizing the elephant in the room: Future climate impacts across sectors

The Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP) provides comprehensive climate change projections, identifying regional hotspots of impact types that coincide and interact. The results highlight the need for effective real-world policies to mitigate the impacts of global warming.

SourcePotsdam Institute for Climate Impact Research (PIK)·JournalProceedings of the National Academy of Sciences·DateDec 16, 2013

SOFS take to water

Berkeley Lab researchers unveiled the first soluble single-layer 2D honeycomb SOFs with precise control over dimensionality, holding implications for sensing, separation, energy sciences, and biomimetics. The breakthrough uses non-covalent supramolecular interactions to maintain solubility in water.

SourceDOE/Lawrence Berkeley National Laboratory·JournalJournal of the American Chemical Society·DateDec 16, 2013

Black mayoral candidates win close elections in the South, pointing to importance of voter mobilization

A study by Princeton University finds that black mayoral candidates in Southern cities tend to win close elections with higher voter turnout than their opponents. This is attributed to effective voter mobilization strategies that targeted unregistered African-American voters, making it cheaper for black campaigns to get these votes out.

SourcePrinceton School of Public and International Affairs·JournalJournal of Public Economics·DateDec 16, 2013

Loggerhead sea turtle nesting activity driven by recent climate conditions and returning nesting

A new study reveals that favorable climate conditions in the year prior to nesting and the number of returning female turtles significantly impact loggerhead sea turtle nesting activity. The research suggests that protecting older juveniles and sub-adults is crucial for population recovery, and may be more important than protecting hat...

Regenstrief and IU investigators identify first biomarker linked to delirium duration

A novel role for S100β has been identified as a biomarker for delirium duration in critically ill patients, which may have implications for refining treatment in intensive care units. Delirium duration is associated with increased mortality rates, and higher levels of S100β on day 1 or day 8 are linked to longer delirium duration.

SourceIndiana University·JournalInternational Journal of General Medicine·DateDec 16, 2013

Wake Forest Baptist researchers study alcohol addiction using optogenetics

Researchers at Wake Forest Baptist Medical Center are using optogenetics to study the neurochemical basis of addiction. The technology allows them to control specific populations of brain cells using light, providing new direction on patterns of dopamine cell activation that may be most effective to target alcohol drinking.

SourceAtrium Health Wake Forest Baptist·JournalFrontiers in Behavioral Neuroscience·DateDec 16, 2013

Brittle-bone babies helped by fetal stem cell grafts

Researchers at Karolinska Institutet have successfully treated two babies in utero with mesenchymal stem cells, a type of connective tissue cell that can form and improve bone tissue. The treatment was administered to babies born with osteogenesis imperfecta, a rare congenital bone disease causing stunted growth and repeated fractures.

SourceKarolinska Institutet·JournalStem Cells Translational Medicine·DateDec 16, 2013

JCI early table of contents for Dec. 16, 2013

Researchers evaluated potential age-promoting compounds using a novel mouse model, finding that UV light exposure and cigarette smoke increased p16INK4 expression, while a high-fat diet did not accelerate this process. This study demonstrates the utility of the p16LUC mouse model for evaluating age-promoting agents.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateDec 16, 2013

Traffic jams lend insight into emperor penguin huddle

A mathematical model recreated the positions and movements of individual emperor penguins in a huddle, showing that an individual penguin only needs to move 2 cm for its neighbor to react. The model revealed how travelling waves propagate through the entire huddle, keeping it dense and protecting the birds from the cold.

SourceIOP Publishing·JournalNew Journal of Physics·DateDec 16, 2013

Aging cells unravel their DNA

Senescent cells, a key mechanism of aging, have been identified by researchers. They found that satellite DNA unravels as cells enter senescence, leading to cell division inhibition. This discovery could lead to new treatments for cancer and age-related diseases like Progeria.

SourceRockefeller University Press·JournalJournal of Cell Biology·DateDec 16, 2013

'Superbugs' found breeding in sewage plants

Scientists have discovered 'superbugs' carrying multidrug-resistant bacteria in treated wastewater from two plants in northern China. The study reveals the microbes breed and spread their dangerous cargo, highlighting a significant public health risk.

SourceRice University·JournalEnvironmental Science & Technology Letters·DateDec 16, 2013

4 degree rise will end vegetation 'carbon sink'

New research suggests that global warming of four degrees or more will lead to a saturation point for vegetation's ability to absorb CO2, resulting in a decrease in the 'carbon sink' effect. This shift in focus could change how scientists approach understanding and mitigating climate change.

SourceUniversity of Cambridge·JournalProceedings of the National Academy of Sciences·DateDec 16, 2013

Hybrid protein deregulates complement in dense deposit disease

Researchers identified a chromosomal deletion in the CFHR gene cluster, resulting in production of a hybrid CFHR2/CFRH5 that stabilized C3 convertase. Treatment with soluble C1 restored C3 convertase decay and may be a promising treatment option for patients with refractory dense deposit disease.

SourceJCI Journals·JournalJournal of Clinical Investigation·DateDec 16, 2013

Icahn School of Medicine at Mount Sinai garners $6 million NIH grant for concussion research

The grant aims to build a more precise understanding of chronic traumatic encephalopathy and traumatic brain injury in civilians over age 45. Investigators will use extensive resources from an ongoing study of brain aging and conduct analyses of neuropsychology, neuroradiology, neurological, geriatric, and epidemiological aspects.

Vitamin supplements a waste of money?

Most multivitamin supplements have no benefit in preventing chronic disease or death, and long-term use does not preserve cognitive function. Researchers found that high doses of multivitamins and minerals do not protect against cardiovascular events following myocardial infarction.

SourceAmerican College of Physicians·JournalAnnals of Internal Medicine·DateDec 16, 2013

Study: Pay kids to eat fruits and vegetables

Researchers found that directly paying students to eat fruits and vegetables increases consumption by 80 percent, while also reducing food waste by 33 percent. This approach is cheaper and more effective than traditional school lunch rules, which often result in a significant amount of wasted produce.

SourceBrigham Young University·JournalPublic Health Nutrition·DateDec 16, 2013

Climate change puts 40 percent more people at risk of absolute water scarcity: Study

A new study published in the Proceedings of the National Academy of Sciences finds that climate change will increase global water scarcity, affecting millions of people worldwide. The study estimates that 40% more people will be at risk of absolute water scarcity due to climate change, with significant regional differences in impacts.

SourcePotsdam Institute for Climate Impact Research (PIK)·JournalProceedings of the National Academy of Sciences·DateDec 16, 2013

Graphene nanoribbons an ice-melting coat for radar

Rice University scientists have developed a spray-on coating made from graphene nanoribbons that can melt ice on sensitive radar domes without interfering with radio frequencies. The material is also transparent and durable, making it a promising competitor to existing deicing technologies.

SourceRice University·JournalACS Applied Materials & Interfaces·DateDec 16, 2013

Dust in homes with dogs may protect against allergies, asthma

A recent study suggests that exposure to dust from homes with dogs can alter the immune response to allergens, reducing allergic inflammation. The researchers found that mice fed dog-associated dust were protected against airway inflammation triggered by cockroach allergen and respiratory syncytial virus.

SourceNIH/National Institute of Allergy and Infectious Diseases·JournalProceedings of the National Academy of Sciences·DateDec 16, 2013

Discovered diversity of antiviral bacteria

Researchers have identified diverse strains of Wolbachia bacteria that offer strong antiviral protection against diseases like dengue, but may come with a cost to the host's lifespan. The study found that certain strains replicate more quickly and reach higher concentrations in flies, potentially reducing their lifespan.

SourceInstituto Gulbenkian de Ciencia·JournalPLOS Genetics·DateDec 16, 2013

Microprinting leads to low-cost artificial cells

Artificial cells manufactured via microprinting can mimic natural cell membranes, allowing researchers to study cellular processes. The creation of uniform-sized artificial cells with proteins and lipids enables high-throughput screenings for drug delivery and disease prevention.

SourcePenn State·JournalAdvanced Materials·DateDec 16, 2013

A universal RNA extraction protocol for land plants

A new RNA extraction protocol for land plants has been developed, allowing for the extraction of high-quality RNA from a wide variety of plant species and tissue types. This protocol will greatly facilitate RNA-based studies of non-model plant species and enable comparative analyses of transcriptomes across diverse lineages.

SourceBotanical Society of America·JournalAmerican Journal of Botany·DateDec 16, 2013

The effects of sequestration on Indian health

A new commentary highlights the devastating impact of sequestration on the Indian Health Service, perpetuating longstanding health care disparities. Funding cuts lead to rationing of services, contributing to a 4.1-year gap in life expectancy compared to mainstream Americans, with alarming rates of alcoholism, diabetes, and mortality.

SourceThe Hastings Center·JournalHastings Center Report·DateDec 16, 2013