Chemists from the USA, South Korea, Hungary and Switzerland have developed a heterogeneous ruthenium-based catalyst for the synthesis of cyclic polymers from cyclopentene. They also managed to come up with a reaction installation that makes it easy to separate the catalyst from the reaction products. The study was published in Nature Chemistry. Linear polymers containing… Continue reading Heterogeneous catalyst reduces the cost of synthesis of cyclic polymers
German physics teachers made a universal spectrometer in the Czerny-Turner scheme using LEGO constructors and scrap materials. The authors showed that it can be used to study the spectra of atomic emission, transmission, reflection and fluorescence. Reconfiguring the device for different tasks takes a few minutes, and the total cost of the device does not… Continue reading Spectrometer based on LEGO constructor will make studying physics cheaper
The Voyager 1 team solved the problem of sending anomalous telemetry that had been coming from the probe for several months. It turned out that the cause of the failure was a faulty on-board computer, which was mistakenly assigned the operation of sending data. The problem has now been fixed, according to NASA's website. Voyagers… Continue reading NASA has fixed a glitch in Voyager 1's telemetry sending system.
American physicists were able to induce anti-Stokes superfluorescence of one or several lanthanide-doped nanoparticles at room temperature. The rate of collective emission of ions turned out to be four orders of magnitude greater than ordinary luminescence. This research opens the way to the use of single nanoparticles in the creation of optical processors. The study… Continue reading Superfluorescence on single nanoparticles was obtained at room temperature
American bioinformaticians have discovered traces in the genomes of mammals of 15 independent occurrences of new proteins responsible for the viscosity of saliva. According to the findings of the authors of a study published in Science Advancesthe culprit is a region of the genome with a high mutation rate and selection pressure during the evolutionary… Continue reading Evolution forced mammals to recreate salivary proteins fifteen times
Archaeologists reported the results of excavations in Staraya Russa. This season they managed to discover the oldest city necropolis, dating back to the 11th – early 12th centuries, as well as two birch bark letters. In the text of the 54th letter, the author is a certain Donkey. Perhaps this is a version of a… Continue reading Archaeologists found a birch bark letter in Staraya Russa with a request to buy deer mittens
Police in the Indian city of Vadodara have detained two young men for trying to cheat their way into a local railway exam by using a fingerprint. One of the students cut the skin off his finger and gave it to a friend so that he could fool the biometrics system, NDTV reported. In 1877,… Continue reading Indian student tried to use friend's skin for biometric authentication
Physicists using laser tweezers have learned to control the interaction between two bound levitating nanoparticles that act on each other with different forces. By changing the parameters of the laser beam, scientists controlled the position of the particles, the amplitude and phase of their oscillations, and the force of interaction. The method will make it… Continue reading Physicists have learned to control the asymmetrical interaction of levitating particles
Paleogeneticists read DNA from Pleistocene sediment samples recovered from Israel's Sephunima Cave. In layers ranging from 30 to 70 thousand years old, they were able to find fragments of mitochondrial DNA from representatives of the deer and hyena families. These are the oldest examples for deposits originating from a region with a climate similar to… Continue reading DNA dating back 30,000 to 70,000 years was found in a Levantine cave.
Biologists have found out who should be blamed for the environmental disaster caused by rabbits brought to Australia. Genetic analysis has shown that almost the entire local population of these animals descends from 13 wild and domestic individuals and their descendants, which were received from England in 1859 and released on his estate by settler… Continue reading A 19th-century English farmer was accused of invading Australia by rabbits.