| Expanding the BN‐Embedded PAH Family: 4a-aza-12a-borachrysene
|
| Chem. Commun., 2020, Accepted Manuscript DOI: 10.1039/C9CC09998K, Communication Juan J. Vaquero, David Sucunza, Alberto Abengózar, Patricia García-García, Isabel Valencia, Adrian Perez-Redondo, Guillermo Otarola, Francisco Mendicuti Previously unknown 4a-aza-12a-borachrysene has been synthesized in only four steps. The reactions of this BN-embedded PAH with bromine and organolithium compounds proceed with complete regioselectivity, resulting in the formation of...
|
| Central Centaurus A
|
 A mere 11 million light-years away, Centaurus A is the closest active galaxy to planet Earth. Also known as NGC 5128, the peculiar elliptical galaxy is over 60,000 light-years across. A region spanning about 8,500 light-years, including the galaxy's center (upper left), is framed in this sharp Hubble Space telescope close-up.
|
| NASA scientists spot water in Jupiter's atmosphere
|
| NASA astronomers have recently revealed that our neighbourhood gas-giant, Jupiter, contains water in its atmosphere, albeit in a fractional amount.According to a statement on NASA Jet Propulsion Laboratory's website, nearly 0.25 per cent of Jupiter's atmosphere comprises of water, especially around the equatorial regions, reported Fox News.This finding which was published in the Nature Astronomy journal was reached upon the basis of data provided by the Juno space probe that was launched in 2011 and entered Jupiter's orbit in 2016.Juno's principal investigator Scott Bolton said in the NASA article that "Juno's surprise discovery that the atmosphere was not well mixed even well below the cloud tops is a puzzle that we are still trying to figure out. No one would have guessed that water might be so variable across the planet."The precise number was derived from the information gathered out of Juno's eight flybys around the planet."We found the water in the equator to be greater than ...
|
| How sabre-toothed cats got their bites
|
| Big cats are the most specialized killers of large prey among carnivorans. Dogs, bears, or hyenas have teeth fit to deal with non-meat food items like bone, invertebrates or plants. Not the cats: In the course of evolution they lost almost all teeth not essential for killing prey or cutting meat. But in the distant past there was a group of cats that went farther down the path of specialization, making their living relatives look like amateur hunters. They were the sabre-toothed felids, members of the extinct subfamily Machairodontinae within the cat family. A lot of ink has been spilled about the enigmatic extinction of the sabre-toothed felids at the end of the Pleistocene, 10,000 years ago, especially because they were so diverse and widespread until then. But if we consider that many of their prey animals disappeared at about the same time, their demise seems less mysterious, or at least can be seen as part of a bigger mystery: the catastrophic Armageddon that razed the Ice Age megafaunas. Just as ...
|
|
| Nonswellable gradient hydrogel with tunable mechanical properties
|
| Susceptibility of traditional hydrogels to water leads to the deterioration of their mechanical properties and the dimensional unstability. Inspired by bone tissues, here, we report a nonswellable gradient hydrogel with adjustable mechanical properties via a simple acid-heat treatment of polyamide-based hydr
|
| In air: More than pollution and meets the eye and what to do about it
|
 There is this sense, an opinion, among a cohort or cohorts that carbon dioxide introduced into the atmosphere isn't air pollution at all when it occurs naturally or is the result of such being released through the burning of fossil fuels like oil, natural gas or coal; in other words, it makes no difference what […]
|
|
, article language English ( Russian [ translation ] )
