Study paves way for widespread architectural use of end-of-life tires

'Earthship' built from recycled tires at Ironbank, SA. 
Credit: Earthship Ironbank

A new study by The University of South Australia published in the journal Engineering Structures has tested and verified the structural integrity of walls constructed from tires packed with earth, with the results potentially providing new opportunities for the reuse of end-of-life tires in the construction industry.

Tire waste represents a major sustainability challenge globally, with Australia alone generating an average of 55 million (450,000 tons) end-of-life tires each year.

While earth-packed tire walls have been used in niche construction scenarios for decades, there has previously been no strong empirical data available to support their use, a fact that has limited their wider uptake by architects and engineers.

Supported by Tire Stewardship Australia, a UniSA team consisting of Yachong Xu, Martin Freney, Reza Hassanli, Yan Zhuge, Mizanur Rahman and Rajibul Karim, has rigorously assessed the structural integrity of a test tire wall to examine how the structure performed under various stressors.

According to Dr. Martin Freney, the wall proved to be as structurally sound as conventional walls used in residential applications.

“The wall we tested was the first of its kind to be scientifically tested in this fashion, and all the data indicates tire walls can be extremely strong and safe structures,” Dr. Freney says.

Sulfur shortage: a potential resource crisis looming as the world decarbonizes

Sulfur Image by Simon from Pixabay 

A projected shortage of sulfuric acid, a crucial chemical in our modern industrial society, could stifle green technology advancement and threaten global food security, according to a new study led by UCL researchers.

The study, published in the Royal Geographical Society (with the Institute of British Geographers) journal The Geographical Journal, highlights that global demand for sulfuric acid is set to rise significantly from ‘246 to 400 million tons' by 2040 - a result of more intensive agriculture and the world moving away from fossil fuels.

The researchers estimate that this will result in a shortfall in annual supply of between 100 and 320 million tons - between 40% and 130% of current supply - depending on how quickly decarbonization occurs.

A vital part of modern manufacturing, sulfuric acid is required for the production of phosphorus fertilizers that help feed the world, and for extracting rare metals from ores essential to the rapidly required green economy transition, like cobalt and nickel used in high-performance Li-ion batteries.

Currently, over 80% of the global sulfur supply is in the form of sulfur waste from the desulfurization of crude oil and natural gas that reduces the sulfur dioxide gas emissions that cause acid rain. However, decarbonization of the global economy to deal with climate change will significantly reduce the production of fossil fuels - and subsequently the supply of sulfur.

Plastic Upcycling: From Waste to Fuel for Less

Plastic upcycling provides a way to reuse the waste carbon now cluttering landfills and beaches.
 Animation by Sara Levine | Pacific Northwest National Laboratory

A plastics recycling innovation that does more with less, presented today at the American Chemical Society fall meeting in Chicago, simultaneously increases conversion to useful products while using less of the precious metal ruthenium.

“The key discovery we report is the very low metal load,” said Pacific Northwest National Laboratory chemist Janos Szanyi, who led the research team. “This makes the catalyst much cheaper.”

The new method more efficiently converts plastics to valuable commodity chemicals—a process termed “upcycling.” In addition, it produces much less methane, an undesirable greenhouse gas, as a byproduct, compared with other reported methods.

“It was very interesting to us that there had been nothing previously published showing this result,” said postdoctoral research scientist Linxiao Chen, who presented the research at ACS. “This research shows the opportunity to develop effective, selective and versatile catalysts for plastic upcycling.”

Caterpillar-like bacteria crawling in our mouth

Confocal microscope image of the caterpillar-like bacterium Conchiformibius steedae, up to 7 µm long, incubated with fluorescently labelled cell wall precursors to follow its cell growth
Credit: CC BY 4.0 Philipp Weber and Silvia Bulgheresi

Likely to survive in the oral cavity, bacteria evolved to divide along their longitudinal axis without parting from one another. A research team co-led by environmental cell biologist Silvia Bulgheresi from the University of Vienna and microbial geneticist Frédéric Veyrier from the Institut national de la recherche scientifique (INRS) just published their new insights in Nature Communications. In their work, they described the division mode of these caterpillar-like bacteria and their evolution from a rod-shaped ancestor. They propose to establish Neisseriaceae oral bacteria as new model organisms that could help pinpoint new antimicrobial targets.

Although our mouth houses over 700 species of bacteria and its microbiota is, therefore, as diverse as that of our gut, not much is known about how oral bacteria grow and divide. The mouth is a tough place to live in for bacteria. The epithelial cells lining the inner surface of the oral cavity are constantly shed and, together with salivary flow, organisms that inhabit this surface will therefore struggle for attachment. It is perhaps better to stick to our mouth that bacteria of the family Neisseriaceae have evolved a new way to multiply. Whereas typical rods split transversally and then detach from each other, some commensal Neisseriaceae that live in our mouths, however, attach to the substrate with their tips and divide longitudinally – along their long axis. In addition to that, once cell division is completed, they remain attached to one another forming caterpillar-like filaments. Some cells in the resulting filament also adopt different shapes, possibly to perform specific functions to the benefit of the whole filament. The researchers explain: "Multicellularity makes cooperation between cells possible, for example in the form of division of labor, and may therefore help bacteria to survive nutritional stress."

Surprising details leap out in sharp new James Webb Space Telescope images of Jupiter

Image 1 This July 27 image of Jupiter taken by the Near-Infrared Camera on the new James Webb Space Telescope is artificially colored to emphasize stunning details of the planet: auroral emission from ionized hydrogen at both the north and south poles (red); high-altitude hazes (green) that swirl around the poles; and light reflected from the deeper main cloud (blue). The Great Red Spot, the equatorial region and compact cloud regions appear white or reddish-white; regions with little cloud cover appear as dark ribbons north of the equatorial region.
Resized Image using AI by SFLORG
Additional Below
Image credit: NASA, European Space Agency, Jupiter Early Release Science team. Image processing: Judy Schmidt

The latest images of Jupiter from the James Webb Space Telescope (JWST) are stunners.

Captured on July 27, the infrared images — artificially colored to make specific features stand out — show fine filigree along the edges of the colored bands and around the Great Red Spot and also provide an unprecedented view of the auroras over the north and south poles.

One wide-field image presents a unique lineup of the planet, its faint rings and two of Jupiter’s smaller satellites — Amalthea and Adrastea — against a background of galaxies.

“We’ve never seen Jupiter like this. It’s all quite incredible,” said planetary astronomer Imke de Pater, professor emerita of the University of California, Berkeley, who led the scientific observations of the planet with Thierry Fouchet, a professor at the Paris Observatory. “We hadn’t really expected it to be this good, to be honest. It’s really remarkable that we can see details on Jupiter together with its rings, tiny satellites and even galaxies in one image.”

De Pater, Fouchet and their team released the images today (Aug. 22) as part of the telescope’s Early Release Science program.

Efficient Carbon Dioxide Reduction under Visible Light with a Novel, Inexpensive Catalyst

A novel coordination polymer-based photocatalyst for CO2 reduction exhibits unprecedented performance, giving scientists at Tokyo Tech hope in the fight against global warming. Made from abundant elements and requiring no complex post-synthesis treatment or modifications, this promising photocatalyst could pave the way for a new class of photocatalysts for efficiently converting CO2 into useful chemicals.

The carbon dioxide (CO2) released into the atmosphere during fossil fuel burning is a leading cause of global warming. One way to address this growing threat is to develop CO2 reduction technologies, which convert CO2 into useful chemicals, such as CO and formic acid (HCOOH). In particular, photocatalytic CO2 reduction systems use visible or ultraviolet light to drive CO2 reduction, much like how plants use sunlight to conduct photosynthesis. Over the past few years, scientists have reported many sophisticated photocatalysts based on metal-organic frameworks and coordination polymers (CPs). Unfortunately, most of them either require complex post-synthesis treatment and modifications or are made from precious metals.

In a recent study published in ACS Catalysis, a research team Japan found a way to overcome these challenges. Led by Specially Appointed Assistant Professor Yoshinobu Kamakura and Professor Kazuhiko Maeda from Tokyo Institute of Technology (Tokyo Tech), the team developed a new kind of photocatalyst for CO2 reduction based on a CP containing lead–sulfur (Pb–S) bonds. Known as KGF-9, the novel CP consists of an infinite (–Pb–S–) n structure with properties unlike any other known photocatalyst.

Which animals can best withstand climate change?

Masai Mara National Reserve, Kenya
Credit: David Heiling on Unsplash

Extreme weather such as prolonged drought and heavy rainfall is becoming more and more common as the global average temperature rises – and it will only get worse in the coming decades. How will the planet’s ecosystems respond?

That is the big question and the background for our study, said biologist John Jackson.

Together with his biologist colleagues Christie Le Coeur from the University of Oslo and Owen Jones from SDU, he authored a new study, published in eLife.

A clear pattern

In the study, the authors analyzed data on population fluctuations from 157 mammal species from around the world and compared them with weather and climate data from the time the animal data were collected. For each species there are 10 or more years of data.

Their analysis has given them an insight into how populations of animal species have coped at times of extreme weather: Did they become more, or less, numerous? Did they have more or fewer offspring?

We can see a clear pattern: Animals that live a long time and have few offspring are less vulnerable when extreme weather hits than animals that live for a short time and have many offspring. Examples are llamas, long-lived bats and elephants versus mice, possums and rare marsupials such as the woylie, said Owen Jones.

Random Acts of Kindness Make a Bigger Splash Than Expected

Even though they often enhance happiness, acts of kindness such as giving a friend a ride or bringing food for a sick family member can be somewhat rare because people underestimate how good these actions make recipients feel, according to new research from The University of Texas at Austin.

The study by UT Austin McCombs School of Business Assistant Professor of Marketing Amit Kumar, along with Nicholas Epley of the University of Chicago, found that although givers tend to focus on the object they’re providing or action they’re performing, receivers instead concentrate on the feelings of warmth the act of kindness has conjured up. This means that givers’ “miscalibrated expectations” can function as a barrier to performing more prosocial behaviors such as helping, sharing or donating.

The research is online in advance in the Journal of Experimental Psychology: General.

To quantify these attitudes and behaviors, the researchers conducted a series of experiments.

In one, the researchers recruited 84 participants in Chicago’s Maggie Daley Park. Participants could choose whether to give away to a stranger a cup of hot chocolate from the park’s food kiosk or keep it for themselves. Seventy-five agreed to give it away.

Researchers delivered the hot chocolate to the stranger and told them the study participant had chosen to give them their drink. Recipients reported their mood, and performers indicated how they thought recipients felt after getting the drink.

‘Forever chemicals’ destroyed by simple new method

Water samples for PFAS analysis.
Credit: Michigan Department of Environment, Great Lakes and Energy

PFAS, a group of manufactured chemicals commonly used since the 1940s, are called “forever chemicals” for a reason. Bacteria can’t eat them; fire can’t incinerate them; and water can’t dilute them. And, if these toxic chemicals are buried, they leach into surrounding soil, becoming a persistent problem for generations to come.

Now, Northwestern University chemists have done the seemingly impossible. Using low temperatures and inexpensive, common reagents, the research team developed a process that causes two major classes of PFAS compounds to fall apart — leaving behind only benign end products.

The simple technique potentially could be a powerful solution for finally disposing of these harmful chemicals, which are linked to many dangerous health effects in humans, livestock and the environment.

The research is published in the journal Science.

“PFAS has become a major societal problem,” said Northwestern’s William Dichtel, who led the study. “Even just a tiny, tiny amount of PFAS causes negative health effects, and it does not break down. We can’t just wait out this problem. We wanted to use chemistry to address this problem and create a solution that the world can use. It’s exciting because of how simple — yet unrecognized — our solution is.”

Hope for new curative treatment for children with neuroblastoma

Credit: National Cancer Institute

Children who relapse into the aggressive neuroblastoma cancer form have little chance of survival. Researchers at Karolinska Institutet, among others, have been able to show that DHODH inhibitors, which have been well tolerated by humans, can cure neuroblastoma in mice if given together with cell toxins. The study has been published in the journal JCI Insight and paves the way for clinical trials of combination therapy.

Neuroblastoma is a tumor of nerve tissue that is diagnosed early, usually before the age of two. The disease affects about 15 to 20 children annually in Sweden and is the deadliest form of cancer in young children. The new study shows that the protein DHODH (dihydroorotate dehydrogenase), which is involved in metabolism and DNA synthesis, also has a key role in aggressive neuroblastoma and increases tumor growth.