Scientists propose super-bright light sources powered by quasiparticles

A team of scientists ran advanced computer simulations on supercomputers to propose a way to use quasiparticles for super-bright light sources.
Image Credit: Bernardo Malaca

An international team of scientists is rethinking the basic principles of radiation physics with the aim of creating super-bright light sources. In a new study published in Nature Photonics, researchers from the Instituto Superior Técnico (IST) in Portugal, the University of Rochester, the University of California, Los Angeles, and the Applied Optics Laboratory in France proposed ways to use quasiparticles to create light sources as powerful as the most advanced ones in existence today, but much smaller.

“The most fascinating aspect of quasiparticles is their ability to move in ways that would be disallowed by the laws of physics governing individual particles.”

Quasiparticles are formed by many electrons moving in sync. They can travel at any speed—even faster than light—and withstand intense forces, like those near a black hole.

“The most fascinating aspect of quasiparticles is their ability to move in ways that would be disallowed by the laws of physics governing individual particles,” says John Palastro, a senior scientist at the Laboratory for Laser Energetics, an assistant professor in the Department of Mechanical Engineering, and an associate professor at the Institute of Optics.

New non-invasive form of deep brain stimulation could provide alternative treatment for brain diseases

Photo Credit: Helix Centre

Researchers at the UK Dementia Research Institute have developed a new form of deep brain stimulation that does not require surgery and could provide an alternative treatment option for brain diseases such as Alzheimer’s.

The exciting new technology has been successfully trialed with 20 healthy volunteers for the first time by Dr Nir Grossman and Dr Ines Violante and the team at the UK Dementia Research Institute (UK DRI) at Imperial College London and the University of Surrey.

Known as temporal interference (TI), it works by safely delivering differing frequencies of electrical field through electrodes placed on the scalp and different parts of the head. The overlapping electrical fields enable a deep region of the brain known as the hippocampus to be targeted by electrical stimulation, without affecting the surrounding areas – a procedure that until now required brain surgery. 

Cut emissions and improve farming to protect wilderness

Photo Credit: Dave Willhite

Humanity must cut carbon emissions and use farmland more efficiently to protect our planet’s remaining wilderness, new research shows.

Climate change is making some wilderness areas more suitable for crop growing, heightening the risk of agricultural expansion, especially in northern areas including Canada, Scandinavia and Russia.

By assessing “future climate suitability” for more than 1,700 crop varieties, the study projects 2.7 million square kilometers of wilderness will become newly suitable for agriculture over the next 40 years.

This is 7% of the world’s total remaining wilderness outside Antarctica.

The study, by the University of Exeter, also projects that the variety of crops that can be grown will decrease on 72% of currently cultivable land worldwide – further driving pressure to expand farming into wilderness.

Antibiotic resistance can impair subsequent adaptations in bacteria, new Concordia research suggests

Farhan Chowdhury (left) and Brandon Findlay; “Instead of relying on antibiotic cocktails, we can have an alternative where sequential antibiotic therapies are applied. This can lead to better therapies and give patients more time to recover before resistance evolves.”
Photo Credit: Courtesy of Concordia University

Researchers at Concordia’s Department of Biology and Department of Chemistry and Biochemistry have discovered a possible new avenue of treatment that can help slow antibiotic resistance in bacteria.

PhD candidate Farhan Chowdhury and associate professor Brandon Findlay recently shared the results of their research in a recent paper published in the journal ACS Infectious Diseases. The researchers describe how a strain of the bacteria E. coli is left severely weakened after it has developed resistance to the antibiotic chloramphenicol (CHL). This weakness leaves the bacteria unable to adapt to other types of antibiotics.

Understanding the ways in which resistance impairments evolve can help clinicians better target pathogens in patients.

“Instead of relying on antibiotic cocktails, we can have an alternative where sequential antibiotic therapies are applied,” Chowdhury explains.

“Clinicians can select the sequence of medication by seeing if a first antibiotic imposes deficits on the bacteria, which would slow down the evolution of resistance in the subsequent ones. This can lead to better therapies and give patients more time to recover before resistance evolves.”

Understanding mutualism can help control the spread of invasive species

The subalpine fir has a mutualistic relationship with belowground fungi.
Photo Credit: Khilav Majmudar, University of Minnesota

Cooperation between species to help each other's survival is known as mutualism. It is seen among many types of organisms, such as plants and fungi that exchange nutrients with one another, plants that provide bees with nectar in exchange for pollination, and sea anemones that provide protection for clown-fish in exchange for excreted nutrients. Recently, scientists have found evidence that some invasive plants become even more invasive in the presence of helpful partners, as can happen with certain pine trees and fungi or fig trees and wasps. But other studies have suggested that species that didn't rely on mutualist partners were more invasive. 

Recent research at the University of Minnesota, published in the journal Ecology, attempted to identify the conditions under which a mutualistic partner could make a species more or less invasive. To study this, they built mathematical models called integro-difference equations (IDEs). IDEs take into account the effects of mutualism on growth and dispersal of species and are useful tools to model spatial processes. Mathematical models are helpful in understanding ecological processes like invasion that occur over many years and can be difficult to study in the field.

Electrons are quick-change artists in molten salts, chemists show

When exposed to radiation, electrons produced within molten zinc chloride, or ZnCl2, can be observed in three distinct singly occupied molecular orbital states, plus a more diffuse, delocalized state.
Illustration Credit: Hung H. Nguyen/University of Iowa

In a finding that helps elucidate how molten salts in advanced nuclear reactors might behave, scientists have shown how electrons interacting with the ions of the molten salt can form three states with different properties. Understanding these states can help predict the impact of radiation on the performance of salt-fueled reactors.

The researchers, from the Department of Energy’s Oak Ridge National Laboratory and the University of Iowa, computationally simulated the introduction of an excess electron into molten zinc chloride salt to see what would happen.

They found three possible scenarios. In one, the electron becomes part of a molecular radical that includes two zinc ions. In another, the electron localizes on a single zinc ion. In the third, the electron is delocalized, or spread out diffusely over multiple salt ions.

Because molten salt reactors are one of the reactor designs under consideration for future nuclear power plants, “the big question is what happens to molten salts when they’re exposed to high radiation,” said Vyacheslav Bryantsev, leader of the Chemical Separations group at ORNL and one of the scientists on the study and an author of the paper. “What happens to the salt that is used to carry the fuel in one of those advanced reactor concepts?”

Lactate-producing bacteria inside tumors promote resistance to radiation therapy

Lactobacillus iners taken from cervical cancer tumor samples spread on agar plate.
Image Credit: Courtesy of David Lo.

Researchers at The University of Texas MD Anderson Cancer Center have discovered that lactate-producing intratumoral bacteria drives resistance to radiation therapy, suggesting that lactic acid-producing bacteria present in various cancers may serve as novel therapeutic targets.

The study, published today in Cancer Cell, reported that a particular bacterial species, Lactobacillus iners (L. iners), caused cancer cells to respond to radiation by rewiring metabolic signaling pathways to resist treatment. The researchers also found that L. iners was associated with poorer clinical outcomes in patients with cervical cancer.

“These lactic acid-producing bacteria are seemingly responsible for changing signaling pathways by priming cancer cells to use lactate instead of glucose to fuel growth and proliferation from oxidative stress following radiation therapy,” said corresponding author Lauren Colbert, M.D., assistant professor of Radiation Oncology. “This is potentially paradigm shifting, and we currently are working on novel approaches to target these specific intratumoral bacteria. We are hopeful that these efforts will lead us to approaches that can benefit patients across several types of cancer.”

Astronomers detect most distant fast radio burst to date

This artist’s impression (not to scale) illustrates the path of the fast radio burst FRB 20220610A, from the distant galaxy where it originated all the way to Earth, in one of the Milky Way’s spiral arms. The source galaxy of FRB 20220610A, pinned down thanks to ESO’s Very Large Telescope, appears to be located within a small group of interacting galaxies. It’s so far away its light took eight billion years to reach us, making FRB 20220610A the most distant fast radio burst found to date. 
Full Size Image
Credit: ESO/M. Kornmesser

An international team has spotted a remote blast of cosmic radio waves lasting less than a millisecond. This 'fast radio burst' (FRB) is the most distant ever detected. Its source was pinned down by the European Southern Observatory’s (ESO) Very Large Telescope (VLT) in a galaxy so far away that its light took eight billion years to reach us. The FRB is also one of the most energetic ever observed; in a tiny fraction of a second it released the equivalent of our Sun’s total emission over 30 years.

The discovery of the burst, named FRB 20220610A, was made in June last year by the ASKAP radio telescope in Australia and it smashed the team’s previous distance record by 50 percent.

“Using ASKAP’s array of dishes, we were able to determine precisely where the burst came from,” says Stuart Ryder, an astronomer from Macquarie University in Australia and the co-lead author of the study published today in Science. “Then we used [ESO’s VLT] in Chile to search for the source galaxy, finding it to be older and further away than any other FRB source found to date and likely within a small group of merging galaxies.”

Rice researcher scans tropical forest with mixed-reality device

Rice doctoral alumnus Daniel Gorczynski wearing a Microsoft HoloLens headset.
Photo Credit: Jeff Fitlow/Rice University

Rice University scientists used a commercially available mixed-reality headset with custom-designed software to measure and analyze forest floor vegetation, demonstrating a correlation between animal diversity and the mapped habitat of a Tanzanian national park. According to the paper published in the journal Ecology, the greater the microhabitat surface area, the richer the biodiversity of its mammals.

Traditional habitat field research requires a significant amount of time and effort, but Rice postdoctoral researcher Daniel Gorczynski reduced those costs by incorporating a Microsoft HoloLens with his innovative VegSense software. Gorczynski and his advisor, assistant professor of biosciences Lydia Beaudrot, created VegSense to help researchers measure animal habitats, while the HoloLens was initially designed to improve work quality and outcomes in manufacturing, engineering, healthcare and education.

“Because the HoloLens is a mixed-reality device, you can see both the projected mesh over the forest structure as well as your local surroundings,” Gorczynski said.

New mollusk and crustacean species in symbiosis with worms in dead coral rocks

Bonellia sp. aff. minor (green) and its burrow associates -- Basterotia bonelliphila (right) and Leucothoe bonelliae (left) -- in dead coral rock. The inside of the burrows is partly occupied by sandy sediments collected by Bo. sp. aff. minor.
Image Credit: KyotoU/Ryutaro Goto

Good real estate is not easy to find, even for sea creatures. Sometimes, push comes to shove, and species resort to competition or conquering before weighing the benefits of sharing an ecosystem like housemates.

There is abundant research on live-in symbionts, which share the burrows of other organisms in sand and mud on the seabed. However, studies on burrow niches in rigid substrates, such as rocks on the seabed, have been scarce.

Now, a research team led by Kyoto University has discovered the symbiotic communities of invertebrates in dead coral gravel on the shallow, warm-temperate coast of the Kii Peninsula in western Japan. New bivalve species and sideswimmers have been found to live communally with the greenish Bonellia spoonworm.