Heterogeneous catalyst reduces the cost of synthesis of cyclic polymers

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

Bushfire smoke raised temperatures in Australia by three degrees

British climatologists studied the distribution of smoke in the stratosphere after bushfires in Australia in 2019–2020. They found that black carbon particles in the smoke increased the average temperature in the lower stratosphere by 0.7 degrees worldwide, with temperatures rising by three degrees over Australia. Additionally, the reaction of smoke and ozone has caused the… Continue reading Bushfire smoke raised temperatures in Australia by three degrees

Tea drinking linked to reduced risk of death from all causes

American researchers have found that drinking tea is associated with a decrease in mortality from all causes, and also found a relationship with a decrease in the likelihood of death from cardiovascular diseases, coronary heart disease and stroke. The results of a survey and medical examination of half a million Britons aged 40 to 69… Continue reading Tea drinking linked to reduced risk of death from all causes

An organometallic cocatalyst helped produce ammonia by electrolysis

Chemists from the USA have found a cobalt-based cocatalyst, which, together with a tungsten-based catalyst, makes it possible to effectively produce ammonia from nitrogen under electrolysis conditions. Thanks to this combination of catalysts, the process was able to be carried out at a relatively high potential of −1.35 volts and with a current efficiency of… Continue reading An organometallic cocatalyst helped produce ammonia by electrolysis

Watering with ethyl alcohol protected the rhizome from drought

Japanese geneticists have proposed increasing the drought resistance of plants using ethanol. They watered Tal's rhizomes (Arabidopsis thaliana) with a weak alcohol solution for three days and showed that this helped the plants survive the subsequent three-week drought. In response to alcohol, the plant activates the synthesis of the stress phytohormone, abscisic acid, which helps… Continue reading Watering with ethyl alcohol protected the rhizome from drought

Oscillations of water droplets on the ISS improve understanding of wetting

American physicists studied the natural vibrations of water droplets on hydrophobic substrates in microgravity conditions. To do this, they sent the necessary materials and equipment to the ISS. By filming the vibrations of the drops on camera, the scientists were able to confirm that their previously developed theory of vibrations of free drops works well.… Continue reading Oscillations of water droplets on the ISS improve understanding of wetting

People didn't want to help others after a sleepless night and daylight saving time.

After a night of poor sleep or no sleep at all, people consider themselves less willing to help others, American scientists found in laboratory experiments and studying the sleep experience of people at home. It also found that after daylight saving time, when people potentially lose an hour of sleep, they donate less than they… Continue reading People didn't want to help others after a sleepless night and daylight saving time.

The Gemini telescope reduced the mass of the heaviest known star

Using the ground-based Gemini South telescope, astronomers have obtained a record-breakingly detailed image of the central zone of the R136 cluster, where the heaviest known star, R136a1, is located. Observational data made it possible to clarify the mass of the most massive stars in the cluster, which turned out to be significantly less than previous… Continue reading The Gemini telescope reduced the mass of the heaviest known star

Switching to cooked food helped people spend five times less energy chewing

Physiologists and anthropologists have analyzed how metabolic rate changes while chewing gum. It turned out that it increases metabolism by 10-15 percent. Extrapolating their results to the average duration of chewing per day in different great apes, the authors found that the proportion of energy expenditure for chewing in humans became approximately five times less… Continue reading Switching to cooked food helped people spend five times less energy chewing

Experimental antibiotic wipes out resistant gram-negative bacteria

American researchers have developed a new antibiotic that is effective against drug-resistant gram-negative bacteria. In experiments on isolates of nosocomial bacteria and on mouse models of infections caused by them, it demonstrated high activity, while having virtually no effect on components of the normal human microbiota. The report on the work was published in the… Continue reading Experimental antibiotic wipes out resistant gram-negative bacteria