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Astronomers using the National Science Foundation s Karl G. Jansky Very Large Array (VLA) and Very Long Baseline Array (VLBA) have found and studied the most distant cosmic jet discovered so far a jet of material propelled to nearly the speed of light by the supermassive black hole in a quasar some 13 billion light-years from Earth. The quasar is seen as it was when the universe was only 780 million years old, and is providing scientists with valuable information about how galaxies evolved and supermassive black holes grew when the universe was that young.
The studies indicate that the quasar a galaxy harboring a black hole 300 million times more massive than the Sun has a jet of fast-moving particles only about 1,000 years old. While other quasars have been found at its distance and beyond, it is the first found at such a distance with the strong radio emission indicating an active jet. Only a small fraction of quasars have such jets.
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IMAGE: Martin Gruebele, right, and graduate student Huy Nguyen demonstrate that economical carbon-based quantum dots emit enough light when excited to eventually replace the expensive and toxic metal quantum dots used. view more
Credit: Photo by L. Brian Stauffer
CHAMPAIGN, Ill. Tiny fluorescent semiconductor dots, called quantum dots, are useful in a variety of health and electronic technologies but are made of toxic, expensive metals. Nontoxic and economic carbon-based dots are easy to produce, but they emit less light. A new study that uses ultrafast nanometric imaging found good and bad emitters among populations of carbon dots. This observation suggests that by selecting only super-emitters, carbon nanodots can be purified to replace toxic metal quantum dots in many applications, the researchers said.
Working under a Health Canada research license, the
Aging-US authors developed over 800 new
C. sativa cultivars and hypothesized that high-CBD
C. sativa extracts may be used to down-regulate ACE2 expression in target COVID-19 tissues.
Using artificial 3D human models of oral, airway and intestinal tissues, they identified 13 high-CBD
C. sativa extracts that decrease ACE2 protein levels.
Some
C. sativa extracts down-regulate serine protease TMPRSS2, another critical protein required for SARS-CoV-2 entry into host cells.
While their most effective extracts require further large-scale validation, their study is important for future analyses of the effects of medical cannabis on COVID-19. The extracts of their most successful novel high-CBD
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IMAGE: A cross-sectional image of selective hydrogen gas permeation in a super hydrophobic membrane formed on a porous tubular support. view more
Credit: Picture courtesy: Yuji Iwamoto from Nagoya Institute of Technology
Hydrogen has been hailed as the fuel of the future owing to several reasons. First, compared to the conventionally used hydrocarbons, hydrogen exhibits higher energy yield. Second, the commercial use of hydrogen fuel, which yields only water as a byproduct product, would help mitigate the imminent global warming crisis by reducing the use of exhaustible and polluting fossil fuels. Thus, ongoing research has been focusing on efficient and environment-friendly ways to produce of hydrogen fuel.