A new sensor can detect ambient levels of mercury in the atmosphere. This new highly sensitive, laser-based instrument provides scientists with a method to more accurately measure global human exposure to mercury. The measurement approach is called sequential two-photon laser induced fluorescence (2P-LIF) and uses two different laser beams to excite mercury atoms and monitor blue shifted atomic fluorescence. University of Miami Rosenstiel School Professor of Atmospheric Sciences Anthony Hynes and colleagues tested the new mobile instrument, alongside the standard instrumentation that is currently used to monitor atmospheric mercury concentrations, during the three-week Reno Atmospheric Mercury Intercomparison Experiment (RAMIX) performed in 2011 in Reno, Nevada.

In the new GSA BULLETIN, Matteo Maggi and colleagues from Italy and Brazil present a new model of the development of fractures showing a stairway trajectory, commonly occurring in finely laminated rock, such microbialites and travertines.

These fractures strongly enhance permeability by connecting several highly porous zones enveloped in tight impermeable levels. Understanding and predicting this fracture pattern geometry, distribution, and interconnection is valuable not only for locating water supplies, but also for oil, gas, and geothermal exploration.

Swedish studies show that mice that receive a supplement of the "appetite hormone" ghrelin increase their sexual activity. Whether the hormone has the same impact on humans is unknown - but if it does, the researchers may have found the key to future treatments for sex abuse.

Ghrelin is a gastrointestinal hormone that is released from the stomach, and is involved in the stimulation of our appetite by activating the brain's reward system.

Since the brain's reward system also motivates us to seek a partner and to have sex, a group of researchers at the Sahlgrenska Academy decided to investigate whether ghrelin may also affect sexual behaviors.

Confirmed effect

The answer is: yes, at least in mice.

For most of us, switching to a vegetarian diet might be a matter of a New Year's resolution and a fair amount of willpower, but for an entire species, it's a much more involved process -- one that evolutionary biologists have struggled to understand for a long time.

Researchers at the University of Arizona have taken a peek behind the curtain of evolution to find out what happens when an insect species dramatically changes its way of life. The processes they discovered involve never-seen-before remodeling of genes, behaviors and diet. The results, published in the Proceedings of the National Academy of Science, or PNAS, are likely to make you ponder evolutionary questions next time you find a fruit fly floating in your glass of wine.

Newly discovered genetic variations linked to autism spectrum disorder (ASD) disrupt the function of the dopamine transporter, suggesting that altered dopamine signaling contributes to this common developmental condition.

Two different inherited genetic variations in two different families of children with ASD "converged" to produce the same changes in nerve function and behavior, the researchers report in EBioMedicine. This is the first report of two different ASD-associated variations producing the same neural and behavioral changes in a Drosophila (fruit fly) model, said Aurelio Galli, Ph.D., professor of Molecular Physiology and Biophysics and of Psychiatry, and corresponding author with Kevin Erreger, Ph.D., and Heinrich J.G. Matthies, Ph.D.

Research on how science works - the science of science - can benefit from studying the digital traces generated during the research process, such as peer-reviewed publications. This type of research is crucial for the future of science and that of scientists, according to Frank Schweitzer, Chair of Systems Design at ETH Zurich, in Switzerland. Indeed, quantitative measures of scientific output and success in science already impact the evaluation of researchers and the funding of proposals. He shares his views in an Editorial spearheading a thematic series of articles entitled "Scientific networks and success in science", published in EPJ Data Science.

A new study of marine organisms that make up the 'biofouling community' - tiny creatures that attach themselves to ships' hulls and rocks in the ocean around the world - shows how they adapt to changing ocean acidification. Reporting in the journal Global Change Biology, the authors examine how these communities may respond to future change.

The most comprehensive analysis to date of research on the effect of negative stereotypes on older people's abilities has concluded that these stereotypes create a significant problem for that demographic.

A research team at the University of Kent's School of Psychology carried out a review and meta-analysis of Aged-Based Stereotype Threat (ABST).

They statistically analyzed international evidence from 37 research studies, both published and unpublished. They concluded that older adults' memory and cognitive performance is negatively affected in situations that signal or remind them of negative age stereotypes. These effects affect both men and women.