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Science News for September 7, 2015


Estrogen, shrubbery, and the sex ratio of suburban frogs

A Yale study reveals that suburban ponds experience a gender revolution due to elevated levels of estrogen in shrubbery and lawn areas. The research shows that female frogs outnumber males, likely caused by endocrine disruption from phytoestrogens produced by plants commonly found in lawns.

SourceYale University·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Molecular bodyguards for immature membrane proteins

Scientists at University of Basel have shown how chaperones stabilize immature bacterial membrane protein FhuA and guide it in the right folding direction, preventing misfolding. This discovery has significant implications for diseases caused by misfolded proteins like Alzheimer's and cystic fibrosis.

SourceUniversity of Basel·JournalNature Structural & Molecular Biology·DateSep 7, 2015

Nanoparticles -- small but unique

Researchers at Chalmers University of Technology have developed a new experimental approach called plasmonic nanospectroscopy to study individual nanoparticles. This method reveals significant differences in properties between seemingly identical particles, which could lead to improved hydrogen sensors for fuel cell cars.

SourceChalmers University of Technology·JournalNature Materials·DateSep 7, 2015

Mobile phone records may predict epidemics of mosquito-borne dengue virus

A new study uses mobile phone records to predict the geographical spread and timing of dengue epidemics, providing critical early warning to policymakers. The model accurately forecasts outbreaks in locations of recent epidemics and emerging trouble spots, enabling national control programs to plan in near real time.

SourceHarvard T.H. Chan School of Public Health·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Widespread convergence in toxin resistance by predictable molecular evolution

A study by Liverpool School of Tropical Medicine researchers reveals that evolution can be highly predictable in terms of developing toxin resistance. Convergent evolution of two amino acid changes in a specific gene leads to the development of toxin resistance in various animals, including insects, reptiles, and mammals.

SourceLiverpool School of Tropical Medicine·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Ancient genomes link early farmers to Basques

A team of researchers has discovered that early Iberian farmers are the closest ancestors to modern-day Basques, contradicting previous hypotheses. The study also reveals that farming was brought to Iberia by groups migrating to northern and central Europe, leading to admixture with local hunter-gatherer populations.

SourceUppsala University·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

The right tree for the right place

The new vegetationmap4africa version provides a smartphone application and website to help users identify tree species and their uses. It aids in agroforestry and landscape restoration by providing information on suitable tree species for specific goods and services, as well as tools for regenerating degraded land.

Did grandmas make people pair up?

A recent study suggests that grandmothering played a crucial role in the development of human pair bonds, which distinguish us from other primates. With increasing human longevity, grandmothers helped feed their weaned children, allowing their daughters to have more kids and passing on genes.

SourceUniversity of Utah·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Poison in the Arctic and the human cost of 'clean' energy

Research from Harvard University suggests that flooding for hydroelectric development can increase methylmercury levels in Arctic ecosystems by up to 200 percent. The study found that freshwater from melting ice mixing with salt water creates a feeding zone for plankton that accumulates mercury and magnifies its effects on the food chain.

SourceHarvard John A. Paulson School of Engineering and Applied Sciences·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Tree of life study unveils inner workings of a cell

A multinational team of scientists created the world's largest protein map, revealing tens of thousands of new protein interactions that account for about a quarter of all estimated protein contacts in a cell. The map is helping researchers spot individual proteins that could be at the root of complex human disorders.

SourceUniversity of Toronto·JournalNature·DateSep 7, 2015

First superconducting graphene created by UBC researchers

UBC physicists successfully induce superconductivity in single-layer graphene by coating it with lithium atoms, opening up new possibilities for graphene electronics and nanoscale quantum devices. The breakthrough has significant cross-disciplinary impacts, with potential applications in computing, medicine, and sustainable energy.

SourceUniversity of British Columbia·JournalProceedings of the National Academy of Sciences·DateSep 7, 2015

Success combating multi-resistant bacteria in stables

Researchers at the University of Bonn successfully eliminated multi-resistant bacteria from a pig stable using radical hygiene measures, including frequent hand washing and quarantine. While MRSA was not eradicated, overall health improvement led to reduced antibiotic use, highlighting potential applications for hospitals

SourceUniversity of Bonn·JournalApplied and Environmental Microbiology·DateSep 7, 2015

MicroRNAs are digested, not absorbed

A recent study has found that microRNAs, previously thought to be digested and absorbed by the body, are actually broken down in the small intestine, rendering them ineffective for modifying physiological functions.

SourceETH Zurich·JournalJournal of Biological Chemistry·DateSep 7, 2015