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58 articles from PhysOrg

Scientists create fully electronic 2-D spin transistors

Physicists from the University of Groningen constructed a two-dimensional spin transistor, in which spin currents were generated by an electric current through graphene. A monolayer of a transition metal dichalcogenide (TMD) was placed on top of the graphene to induce charge-to-spin conversion in the graphene. This experimental observation was described in the issue of the journal Nano Letters...

A matter of concentration

Plants can grow whole new organs with the help of pluripotent stem cells throughout their entire lives. When necessary, these stem cells can develop into any type of cell within an organism. The biologist Prof. Dr. Thomas Laux and his plant genetics research group at the University of Freiburg, who are studying how the balance between stem cells and specialized cells is regulated in plants, have...

A reusable catalyst for the synthesis of esters

A chemist from RUDN University has developed a tin silicate catalyst for the production of esters—flavourings, plasticisers, and biofuel components. Unlike existing catalysts, the new material can be made active again and reused. The results are published in the journal Microporous and Mesoporous Materials.

Bat influenza viruses possess an unexpected genetic plasticity

Bat-borne influenza viruses enter host cells by utilizing surface exposed MHC-II molecules of various species, including humans. Now, an international research team from Germany (Medical Center—University of Freiburg and Friedrich-Loeffler-Institut, island of Riems) and the United States (Colorado State University, Fort Collins and Kansas State University, Manhattan) addressed concerns about the...

A safer way for police to test drug evidence

Scientists have demonstrated a way for police to quickly and safely test whether a baggie or other package contains illegal drugs without having to handle any suspicious contents directly. The new technique can limit the risk of accidental exposure to fentanyl and other highly potent drugs that can be dangerous if a small amount is accidentally inhaled.

NASA-NOAA satellite catches Hurricane Kiko at night

Hurricane Kiko continued to track west through the Eastern Pacific Ocean when NASA-NOAA's Suomi NPP satellite passed overhead and provided a view of the storm. Satellite imagery revealed an elongated shape, which indicated wind shear was still affecting Kiko.

Elusive compounds of greenhouse gas isolated

Nitrous oxide (N2O) is a potent atmospheric pollutant. Although naturally occurring, anthropogenic N2O emissions from intensive agricultural fertilisation, industrial processes, and combustion of fossil fuels and biomass are a major cause for concern. Researchers at the University of Warwick have isolated elusive transition metal compounds of N2O that provide clues into how it could be used in...

Happy hour for time-resolved crystallography

Researchers from the Department of Atomically Resolved Dynamics of the Max Planck institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg, the University of Hamburg and the European Molecular Biology Laboratory (EMBL) outstation in Hamburg have developed a new method to watch biomolecules at work. This method dramatically simplifies...

Researchers see need for action on forest fire risk

How do humans affect forest fires? And what can we learn from forest fires in the past for the future of forestry? An international team of researchers led by Elisabeth Dietze, formerly at the German Research Centre for Geosciences GFZ in Potsdam and now at the Alfred Wegener Institute—Helmholtz Centre for Polar and Marine Research, now provides new answers to these questions. The research team...