NASA’s rover must plow through Mars’ atmosphere at supersonic speeds, deploy a parachute to slow itself, then fly to safety with a jetpack.
The detailed physical processes and pathways involved in the transmission of COVID-19 are still not well understood. Researchers decided to use advanced computational fluid dynamics tools on supercomputers to deepen understanding of transmission and provide a quantitative assessment of how different environmental factors influence transmission pathways and airborne infection risk.
A Chinese spacecraft appears poised to enter orbit around Mars, one day after an orbiter from the United Arab Emirates did so and about a week ahead of an American attempt to put down another spacecraft on the surface of the red planet.
Fabricating fully functional drones
Posted in drones
From “Star Trek” replicators to Richie Rich’s wishing machine, popular culture has a long history of parading flashy machines that can instantly output any item. While 3D printers have now made it possible to produce a range of objects that include product models, jewelry, and novelty toys, we still lack the ability to fabricate more complex devices that are essentially ready-to-go right out of the printer.
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The UAE’s orbiter reaches Mars on Tuesday, followed less than 24 hours later by China’s orbiter-rover combo. NASA’s Perseverance rover is due to land on February 18.
Very promising, machines like this one will help in the desert or in drought condions, even in Mars.
GE Research’s atmospheric water extraction device could supply up to 150 soldiers with water.
A Chinese startup on Monday launched the country’s first homegrown operating system (OS) for quantum computers in Hefei, capital of eastern China’s Anhui Province, according to a local media report.
Placed quite down in the periodic table with the atomic number 99, Einsteinium is the seventh transuranic element.
SARS-CoV-2 mutations similar to those in the B1.1.7 UK variant could arise in cases of chronic infection, where treatment over an extended period can provide the virus multiple opportunities to evolve, say scientists.
Writing in Nature, a team led by Cambridge researchers report how they were able to observe SARS-CoV-2 mutating in the case of an immunocompromised patient treated with convalescent plasma. In particular, they saw the emergence of a key mutation also seen in the new variant that led to the UK being forced once again into strict lockdown, though there is no suggestion that the variant originated from this patient.
Using a synthetic version of the virus Spike protein created in the lab, the team showed that specific changes to its genetic code — the mutation seen in the B1.1.7 variant — made the virus twice as infectious on cells as the more common strain.
New enzyme catalysts are usually engineered by repurposing the active sites of natural proteins. Here we show that design and directed evolution can be used to transform a non-natural, functionally naive zinc-binding protein into a highly active catalyst for an abiological hetero-Diels–Alder reaction. The artificial metalloenzyme achieves 104 turnovers per active site, exerts absolute control over reaction pathway and product stereochemistry, and displays a catalytic proficiency (1/KTS = 2.9 × 1010 M−1) that exceeds all previously characterized Diels–Alderases. These properties capitalize on effective Lewis acid catalysis, a chemical strategy for accelerating Diels–Alder reactions common in the laboratory but so far unknown in nature. Extension of this approach to other metal ions and other de novo scaffolds may propel the design field in exciting new directions.