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83 articles from PhysOrg

International study uncovers secret surfing life of remoras hitchhiking on blue whales

Sticking to the bodies of sharks and other larger marine life is a well-known specialty of remora fishes (Echeneidae) and their super-powered suction disks on their heads. But a new study has now fully documented the "suckerfish" in hitchhiking action below the ocean's surface, uncovering a much more refined skillset that the fish uses for navigating intense hydrodynamics that come with trying to...

Location and extent of coral reefs mapped worldwide using advanced AI

Nearly 75% of the world's coral reefs are under threat from global stressors such as climate change and local stressors such as overfishing and coastal development. Those working to understand and protect coral reefs are building the know-how to mitigate the damage but doing so requires first knowing where reefs are located.

Forecasting elections with a model of infectious diseases

Forecasting elections is a high-stakes problem. Politicians and voters alike are often desperate to know the outcome of a close race, but providing them with incomplete or inaccurate predictions can be misleading. And election forecasting is already an innately challenging endeavor—the modeling process is rife with uncertainty, incomplete information, and subjective choices, all of which must be...

Bison engravings in Spanish caves reveal a common art culture across ancient Europe

Recently discovered rock art from caves in Northern Spain represents an artistic cultural style common across ancient Europe, but previously unknown from the Iberian Peninsula, according to a study published October 28, 2020 in the open-access journal PLOS ONE by Diego Garate of the Instituto Internacional de Investigaciones Prehistóricas de Cantabria, Spain, and colleagues.

Understanding long-term trends of stressors on koala populations

Analysis of three decades of koala rescue data provides new insights into long-term patterns of stressors that impact koala populations in the Australian state of New South Wales. Renae Charalambous and Edward Narayan of Western Sydney University and The University of Queensland present these findings in the open-access journal PLOS ONE on October 28.

Infrared light antenna powers molecular motor

Light-controlled molecular motors can be used to create functional materials to provide autonomous motion, or in systems that can respond on command. For biological applications, this requires the motors to be driven by low-energy, low-intensity light that penetrates tissue. Chemists at the University of Groningen designed a rotary motor that is efficiently powered by near-infrared light, through...

Seafood extinction risk: Marine bivalves in peril?

Marine bivalves are an important component of our global fishery, with over 500 species harvested for food and other uses. Our understanding of their potential vulnerability to extinction lags behind evaluation of freshwater bivalves or marine vertebrates, and so Shan Huang and colleagues, in analyses presented at the annual meeting of the Geological Society of America, used insights and data from...

Tracing the source of illicit sand—can it be done?

If you've visited the beach recently, you might think sand is ubiquitous. But in construction uses, the perfect sand and gravel is not always an easy resource to come by. "Not all sand is equal in terms of what it can be used for," notes Zack Sickman, coauthor of a new study to be presented on Thursday at the Geological Society of America annual meeting. He says concrete aggregate needs sand with...

Deep learning and bioinformatics tools enable in-depth study of glycan molecules for understanding infections

We're told from a young age not to eat too much sugar, but in reality, our bodies are full of the stuff. The surface of every living cell, and even viruses, is covered in a mess of glycans: long, branching chains of simple sugars linked together by covalent bonds. These cell-surface sugars are crucial for regulating cell-cell contact, including the attachment of bacteria to healthy host cells....

The chemistry behind self-driving cars

Self-driving, electric cars have been touted as the next big thing in transportation. While this technology has progressed in recent years, experts caution that automakers will need the chemical industry to help make it a reality. A new article in Chemical & Engineering News, the weekly newsmagazine of the American Chemical Society, explains how chemistry can help develop the materials necessary...

Understanding how a catalyst converts methane into ethene could prevent the flaring of natural gas

It would be a triple win—for the climate, raw material resources, and the chemical industry. With their work, scientists at the Fritz Haber Institute of the Max Planck Society in Berlin hope to create the basis for extracting useful chemical products such as plastics from the methane that is usually flared off during oil production. They are looking into how to design a catalyst that converts...