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225,140 articles from PhysOrg

Acoustic tweezers can pick up objects without physical contact

Researchers from Tokyo Metropolitan University have developed a new technology which allows non-contact manipulation of small objects using sound waves. They used a hemispherical array of ultrasound transducers to generate a 3D acoustic field that stably trapped and lifted a small polystyrene ball from a reflective surface. Their technique employs a method similar to laser trapping in biology, but...

Plastic accumulation in food may be underestimated

A new study has found plastic accumulation in foods may be underestimated. There is also concern these microplastics will carry potentially harmful bacteria such as E. coli, which are commonly found in coastal waters, up the food chain.

Plant root–associated bacteria preferentially colonize their native host-plant roots

An international team of researchers from the Max Planck Institute for Plant Breeding Research and the University of Aarhus in Denmark have discovered that bacteria from the plant microbiota are adapted to their host species. In a newly published study, they show how root-associated bacteria have a competitive advantage when colonizing their native host, which allows them to invade an already...

French astronomers explore supercluster PLCK G334.8-38.0

Using ESA's XMM-Newton telescope, a team of French astronomers has conducted an X-ray study of a supercluster known as PLCK G334.8-38.0. Results of this research, published July 16 on the arXiv pre-print server, deliver important insights into the nature of this structure.

Juicy past of favorite Okinawan fruit revealed

Citrus fruits from the mandarin family are popular throughout the world for their tasty and healthy characteristics. Within Japan, the tiny shiikuwasha and the ornamental tachibana are of special cultural and historical importance. However, the origin of these two varieties, and other East Asian citrus, was something of a mystery until now.

Combining two approaches to advance quantum computing

Quantum computers hold the potential to out-perform all conventional computing systems. Two promising physical implementations for the storage and manipulation of quantum information are the electromagnetic modes of superconducting circuits and the spins of small numbers of electrons trapped in semiconductor quantum dots.

Model predicts process of obsolescence, impacts on manufacturing

Research published in the International Journal of Product Lifecycle Management has looked at the concept of obsolescence. A. Sánchez-Carralero and C. Armenta-Déu of the Universidad Complutense de Madrid in Spain explain how they have developed a model to simulate the obsolescence process that leads to the need to replace durable goods.

Bioplastic made of nanocellulose and mango to improve food preservation

A research team at the University of Cadiz (Spain), together with researchers from the University of Aveiro (Portugal) from the research group Biopol4fun, have developed a bioactive or functionalised plastic made from nanofibrillated cellulose and mango leaf extracts that preserves food longer than non-functionalised plastics.

Research illuminates earliest part of phase separation

Scientists at St. Jude Children's Research Hospital are studying liquid-liquid phase separation (LLPS), a biophysical process through which proteins and nucleic acids in a cell are compartmentalized without a membrane. The work provides new insight into how the strength of the forces that drive phase separation are linked to the speed at which it occurs. The findings were published today in Nature...

To de-ice planes on the fly, researchers aim to control rather than combat ice formation

How do you control ice formation on a plane, even when it's in flight? Jonathan Boreyko, associate professor in the Department of Mechanical Engineering, is leading a team working with Collins Aerospace to develop an approach using ice itself. In a study published in Physical Review Letters, they created a de-icing method that exploits how frost grows on pillar structures to suspend ice as it...

Planetary remnants around white dwarf stars

When a star like our sun gets to be old, in another seven billion years or so, it will no longer be able to sustain burning its nuclear fuel. With only about half of its mass remaining it will shrink to a fraction of its radius and become a white dwarf star. White dwarf stars are common; over 95% of all stars will become white dwarfs. The most famous one is the companion to the brightest star in...

Anthropogenic climate change affects marine plankton populations in the Mediterranean Sea

Anthropogenic climate change is already affecting the marine plankton populations present in the western Mediterranean Sea. This is the result of a study led by the Institute of Environmental Science and Technology of the Universitat Autònoma de Barcelona (ICTA-UAB) thatwarns on the increasing surface ocean temperature lowering organic matter production (primary production), which has negative...

How South Korea is bringing back bears in a country of 52 million people

The return of wolves to Yellowstone National Park in 1995 popularized the idea of reintroducing long-lost species to modern habitats. While scientists are still trying to fully understand the ecological consequences, the wolf's reintroduction likely benefited other species, illustrating how conservation can not just slow biodiversity loss, but even reverse it.

Video: Counting carbon

The Paris Agreement adopted a target for global warming not to exceed 1.5°C. This sets a limit on the additional carbon we can add to the atmosphere—the carbon budget. Only around 17% of the carbon budget is now left. That is about 10 years at current emission rates.

Tiny insects cause big threat to woodland caribou

Threats to Canada's endangered woodland caribou can be traced back to spruce budworm infestations and salvage logging, says a paper co-authored by University of Saskatchewan (USask) researcher Dr. Philip McLoughlin (Ph.D.).