Target CO2 and non-carbon pollutants to slow climate change

Photo: Pixabay

Policies that focus solely on decarbonization will not be sufficient to keep the Earth’s temperature below the “tipping point” threshold scientists have long warned could result in a runaway greenhouse warming effect, according to research published May 23 in the Proceedings of the National Academy of Sciences.

While carbon dioxide is the chemical most responsible for climate change, four other pollutants – methane, black carbon soot, lower-atmosphere ozone smog and hydrofluorocarbon refrigerants – contribute almost half the heat trapped to-date that cause global warming.

Reducing atmospheric levels of all of these pollutants, known as super pollutants, will be necessary to keep global temperatures from rising beyond 1.5 degrees Celsius above pre-industrial levels, the internationally accepted guardrail beyond which the world’s climate is expected to pass irreversible tipping points.

Monitoring the "journey" of microplastics through the intestine of a living organism

Drosophila melanogaster 
Credit: Universitat Autònoma de Barcelona

A UAB research team has managed to track the behavior of microplastics during their "journey" through the intestinal tract of a living organism and illustrate what happens along the way. The study, carried out on Drosophila melanogaster using electron microscopy equipment developed by the researchers themselves, represents a significant step towards a more precise analysis of the health risks of being exposed to these pollutants.

The behavior of micro and nanoplastics (MNPLs) inside the organism is a question impossible to answer at present in humans, and in vitro models are not useful. Hence, there is a need to look for models that allow us to answer this question. Furthermore, there are limitations in the current methodologies for detecting and quantifying their presence in different human biological samples, which prevents an accurate assessment of the health risk of exposure.

In this context, researchers from the Mutagenesis Research Group of the Universitat Autònoma de Barcelona (UAB) have managed to monitor the tracking of MNPLs in their "journey" from the environment to the interior of a living organism. They have done it by developing tools based on electron microscopy and in larvae of the Drosophila melanogaster fly, a model organism widely used to study biological phenomena and processes.

Skydiving salamanders live in world’s tallest trees

The wandering salamander, Aneides vagrans, is about 4 inches (10 centimeters) long and lives its entire life in the crowns of redwood trees more than 150 feet above the ground. Researchers discovered that it has adapted to its high-rise lifestyle by developing the ability to parachute and glide when falling.
Photo credit: Christian Brown

Salamanders that live their entire lives in the crowns of the world’s tallest trees, California’s coast redwoods, have evolved a behavior well-adapted to the dangers of falling from high places: the ability to parachute, glide and maneuver in mid-air.

Flying squirrels, not to mention numerous species of gliding frogs, geckos, ants, and other insects, are known to use similar aerial maneuvers when jumping from tree to tree or when falling, so as to remain in the trees and avoid landing on the ground.

Similarly, the researchers suspect that this salamander’s skydiving skills are a way to steer back to a tree it’s fallen or jumped from, the better to avoid terrestrial predators.

The drug gabapentin may boost functional recovery after a stroke

These 3D images of mouse brain vasculature show normal conditions, top, and after an ischemic stroke, which occurs when a blood vessel clot blocks blood flow in the brain.
Credit: Andrea Tedeschi

The drug gabapentin, currently prescribed to control seizures and reduce nerve pain, may enhance recovery of movement after a stroke by helping neurons on the undamaged side of the brain take up the signaling work of lost cells, new research in mice suggests.

The experiments mimicked ischemic stroke in humans, which occurs when a clot blocks blood flow and neurons die in the affected brain region.

Results showed that daily gabapentin treatment for six weeks after a stroke restored fine motor functions in the animals’ upper extremities. Functional recovery also continued after treatment was stopped, the researchers found.

The Ohio State University team previously found that gabapentin blocks the activity of a protein that, when expressed at elevated levels after an injury to the brain or spinal cord, hinders re-growth of axons, the long, slender extensions of nerve cell bodies that transmit messages.

Medicine for Inflammatory Bowel Disease May Protect Against Severe COVID-19

Gil Melmed, MD

Getting the COVID-19 vaccination strengthened one type of immune response to the SARS-CoV-2 virus in inflammatory bowel disease

(IBD) patients even though they were taking immunosuppressant medication, according to investigators at Cedars-Sinai.

The findings of two studies focused on this topic have been published in the journals IBD, of the Crohn’s & Colitis Foundation, and Frontiers in Immunology.

“We found that with COVID-19 vaccination most of the main immunosuppressive treatments for IBD preserved the T-cell response, with one notable exception: anti-tumor necrosis factor (anti-TNF) drug therapy. This biologic treatment actually elevated T-cell activity in the vaccinated patients. We think this may help protect them from severe disease after breakthrough infection,” said Gil Melmed, MD, principal investigator of the study and director of Inflammatory Bowel Disease Clinical Research at Cedars-Sinai.

New Tech Aims to Drive Down Costs of Hydrogen Fuel

Researchers from North Carolina State University have developed a new technique for extracting hydrogen gas from liquid carriers which is faster, less expensive and more energy efficient than previous approaches.

“Hydrogen is widely viewed as a sustainable energy source for transportation, but there are some technical obstacles that need to be overcome before it can be viewed as a practical alternative to existing technologies,” says Milad Abolhasani, corresponding author of a paper on the new technique and an associate professor of chemical and biomolecular engineering at NC State. “One of the big obstacles to the adoption of a hydrogen economy is the cost of storage and transportation.”

Hydrogen fuel does not result in CO2 emissions. And hydrogen refueling stations could be located at existing gas stations, taking advantage of existing infrastructure. But transporting hydrogen gas is dangerous, so hydrogen needs to be transported via a liquid carrier. A key obstacle for this strategy is that extracting hydrogen from the liquid carrier at destination sites, such as fueling stations, is energy intensive and expensive.

“Previous research has shown that it is possible to use photocatalysts to release hydrogen gas from a liquid carrier using only sunlight,” Abolhasani says. “However, existing techniques for doing this were laborious, time consuming and required a significant amount of rhodium – a metal that is very expensive.”

Custom ‘Headphones’ Boost Atomic Radio Reception 100-Fold

Copper “headphones” boost the sensitivity of NIST’s atomic radio receiver, which is composed of a gas of cesium atoms prepared in a special state inside the glass container. When an antenna located above the setup sends down a radio signal, the headphones boost the strength of the received signal a hundredfold. 
Credit: NIST

Researchers at the National Institute of Standards and Technology (NIST) have boosted the sensitivity of their atomic radio receiver a hundredfold by enclosing the small glass cylinder of cesium atoms inside what looks like custom copper “headphones.”

The structure — a square overhead loop connecting two square panels — increases the incoming radio signal, or electric field, applied to the gaseous atoms in the flask (known as a vapor cell) between the panels. This enhancement enables the radio receiver to detect much weaker signals than before. The demonstration is described in a new paper in Applied Physics Letters.

The headphone structure is technically a split-ring resonator, which acts like a metamaterial — a material engineered with novel structures to produce unusual properties. “We can call it a metamaterials-inspired structure,” NIST project leader Chris Holloway said.

NIST researchers previously demonstrated the atom-based radio receiver. An atomic sensor has the potential to be physically smaller and work better in noisy environments than conventional radio receivers, among other possible advantages.

Discovery of 'ghost' fossils reveals plankton resilience to past global warming events

Ghost nannofossils (left) with virtual casts (right). The fossils are approximately 5 µm in length, 15 times narrower than the width of a human hair.
Credit: S.M Slater

An international team of scientists from UCL, the Swedish Museum of Natural History, the University of Florence and Natural History Museum have found a remarkable type of fossilization that has remained almost entirely overlooked until now.

The fossils are microscopic imprints, or “ghosts”, of single-celled plankton, called coccolithophores, that lived in the seas millions of years ago, and their discovery is changing our understanding of how plankton in the oceans are affected by climate change.

Coccolithophores are important in today’s oceans, providing much of the oxygen we breathe, supporting marine food webs, and locking carbon away in seafloor sediments. They are a type of microscopic plankton that surround their cells with hard calcareous plates, called coccoliths, and these are what normally fossilize in rocks.

Declines in the abundance of these fossils have been documented from multiple past global warming events, suggesting that these plankton were severely affected by climate change and ocean acidification.

Spinning is key for line-dancing electrons in iron selenide

Quantum physicists Pengcheng Dai (left) and Qimiao Si outside Rice’s Brockman Hall for Physics in November 2021.
Photo by Jeff Fitlow/Rice University

Rice University quantum physicists are part of an international team that has answered a puzzling question at the forefront of research into iron-based superconductors: Why do electrons in iron selenide dance to a different tune when they move right and left rather than forward and back?

A research team led by Xingye Lu at Beijing Normal University, Pengcheng Dai at Rice and Thorsten Schmitt at the Paul Scherrer Institute (PSI) in Switzerland used resonant inelastic X-ray scattering (RIXS) to measure the behavior of electron spins in iron selenide at high energy levels.

Spin is the property of electrons related to magnetism, and the researchers discovered spins in iron selenide begin behaving in a directionally dependent way at the same time the material begins exhibiting directionally dependent electronic behavior, or nematicity. The team’s results were published online this week in Nature Physics.

How seascapes of the ancient world shaped genetic structure of European populations

Reconstructed view of the burial caves of the Xaghra Circle (Libby Mulqueeney after an original by Caroline Malone). Source Malone et al.2009. Mortuary Customs in Prehistoric Malta.Cambridge: McDonald, pp 375, 377. Malone, C., Stoddart, S., Trump, D. & Bonanno, A. (eds.). 2009. Mortuary Customs in prehistoric Malta. Excavations at the Brochtorff Circle at Xaghra (1987-1994). Cambridge: McDonald Institute.

Trinity scientists, along with international colleagues, have explored the importance of sea travel in prehistory by examining the genomes of ancient Maltese humans and comparing these with the genomes of this period from across Europe. Previous findings from the archaeological team had suggested that towards the end of the third millennium BC the use of the Maltese temples declined.

Now, using genetic data from ancient Maltese individuals the current interdisciplinary research team has suggested a potential contributing cause. Researchers found that these ancient humans lacked some of the signatures of genetic changes that swept across Europe in this period, because of their island separation. Scientists concluded that physical topography, in particular seascapes played a central role as barriers to genetic exchange.

The study is just published in the journal Current Biology.