Tag: scientists
AI breakthrough enables scientists to read Roman scrolls once buried by Mount Vesuvius
Suck It, Death Cap: Scientists Find Potential Antidote to World’s Deadliest Mushroom
A team of scientists may have just found an antidote to one of the most infamous natural poisons in the world: the death cap mushroom. In a new study, they detail experiments showing that a common medical dye can counteract the fungi’s deadly effects in mice. Given its already approved uses, the team believes that the…
Scientists Discover 62 More Moons Orbiting Saturn, Bringing Total to 145 Moons
So while Jupiter remains the largest planet orbiting our sun — and shaped our solar system with its gravitational bulk — nonetheless the New York Times reports that “the fight over which planet has the most moons in its orbit has swung decisively in Saturn’s favor.”
This month, the International Astronomical Union is set to recognize 62 additional moons of Saturn based on a batch of objects discovered by astronomers. The small objects will give Saturn 145 moons — eclipsing Jupiter’s total of 95. “They both have many, many moons,” said Scott Sheppard, an astronomer from the Carnegie Institution for Science in Washington, D.C. But Saturn “appears to have significantly more,” he said, for reasons that are not entirely understood.
The newly discovered moons of Saturn are nothing like the bright object in Earth’s night sky. They are irregularly shaped, like potatoes, and no more than one or two miles across. They orbit far from the planet too, between six million and 18 million miles, compared with larger moons, like Titan, that mostly orbit within a million miles of Saturn. Yet these small irregular moons are fascinating in their own right. They are mostly clumped together in groups, and they may be remnants of larger moons [150 miles across] that shattered while orbiting Saturn. [The article suggests later they may have been destroyed by collisions with other moons, or by impacts from asteroids or comets.]
“These moons are pretty key to understanding some of the big questions about the solar system,” said Bonnie Buratti of NASA’s Jet Propulsion Laboratory in California and the deputy project scientist on the upcoming Europa Clipper mission to Jupiter. “They have the fingerprints of events that took place in the early solar system.”
The growing number of moons also highlights potential debates over what constitutes a moon. “The simple definition of a moon is that it’s an object that orbits a planet,” Dr. Sheppard said. An object’s size, for the moment, doesn’t matter.
The leader of one moon-discovering group told the Times there’s “potentially thousands” of moons around Saturn and Jupiter.
And at least a few of the moons are circling Saturn in the opposite direction…
Read more of this story at Slashdot.
Scientists discover microbes that can digest plastics at cool temperatures
In a potentially encouraging sign for reducing environmental waste, researchers have discovered microbes from the Alps and the Arctic that can break down plastic without requiring high temperatures. Although this is only a preliminary finding, a more efficient and effective breakdown of industrial plastic waste in landfills would give scientists a new tool for trying to reduce its ecological damage.
Scientists from the Swiss Federal Institute WSL published their findings this week in Frontiers in Microbiology, detailing how cold-adapted bacteria and fungus from polar regions and the Swiss Alps digested most of the plastics they tested — while only needing low to average temperatures. That last part is critical because plastic-eating microorganisms tend to need impractically high temperatures to work their magic. “Several microorganisms that can do this have already been found, but when their enzymes that make this possible are applied at an industrial scale, they typically only work at temperatures above [30 degrees Celsius / 86 degrees Fahrenheit],” the researchers explained. “The heating required means that industrial applications remain costly to date, and aren’t carbon-neutral.”
Unfortunately, none of the microorganisms tested succeeded at breaking down non-biodegradable polyethylene (PE), one of the most challenging plastics commonly found in consumer products and packaging. (They failed at degrading PE even after 126 days of incubation on the material.) But 56 percent of the strains tested decomposed biodegradable polyester-polyurethane (PUR) at 15 degrees Celsius (59 degrees Fahrenheit). Others digested commercially available biodegradable mixtures of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA). The two most successful strains were fungi from the genera Neodevriesia and Lachnellula: They broke down every plastic tested other than the formidable PE.
Plastics are too recent an invention for the microorganisms to have evolved specifically to break them down. But the researchers highlight how natural selection equipping them to break down cutin, a protective layer in plants that shares much in common with plastics, played a part. “Microbes have been shown to produce a wide variety of polymer-degrading enzymes involved in the break-down of plant cell walls. In particular, plant-pathogenic fungi are often reported to biodegrade polyesters, because of their ability to produce cutinases which target plastic polymers due [to] their resemblance to the plant polymer cutin,” said co-author Dr. Beat Frey.
The researchers see promise in their findings but warn that hurdles remain. “The next big challenge will be to identify the plastic-degrading enzymes produced by the microbial strains and to optimize the process to obtain large amounts of proteins,” said Frey. “In addition, further modification of the enzymes might be needed to optimize properties such as protein stability.”
This article originally appeared on Engadget at https://www.engadget.com/scientists-discover-microbes-that-can-digest-plastics-at-cool-temperatures-173419885.html?src=rss
Scientists cook up a rechargeable battery that’s safe to eat
Development of the ingestible battery was led by Mario Caironi, coordinator of the printed and molecular electronics lab at IIT. The battery cell uses riboflavin (vitamin B2) as an anode and the antioxidant quercetin as its cathode. Nori seaweed (think sushi) serves as the separator to avoid short circuits, and…
One wing to rule them all: Scientists name a butterfly after Sauron
Ocean Temperatures Break Records. Scientists are Alarmed
Ocean surface heat is at record-breaking levels. Temperatures began climbing in mid-March and skyrocketed over the course of several weeks, leaving scientists scrambling to figure out exactly why.
Temperatures have fallen since their peak in April — as they naturally do in the spring — but they are still higher than they have ever been on record for this time of year…. The record may not seem huge — it’s nearly two-tenths of a degree higher than the previous record in 2016 — but given how much heat is needed to warm up this huge body of water, “it’s a massive amount of energy,” Matthew England, professor of ocean and climate dynamics at the University of New South Wales, Australia, told CNN… Some scientists are concerned the scale of these new records could mark the start of an alarming trend. Others say record-breaking temperatures like these are always concerning but to be expected given the human-caused climate crisis.
All agree the consequences are likely to be significant. Warmer oceans bleach coral, kill marine life, increase sea level rise and make the ocean less efficient at absorbing planet-warming pollution — the warmer oceans get, the more the planet will heat.
The science leader at the British Antarctic Survey told CNN that “it’s probably too early” to blame El Niño.” In fact, the world just emerged from a 3-year La Niña cooling event in March. So instead, CNN gets a different explanation fro Gregory C. Johnson, an oceanographer at the National Oceanic and Atmospheric Administration:
“It’s a little bit like we’ve had the freezer door open for a while and it’s helped to cool the planet,” Johnson said. But even while that freezer has been open, background temperatures have continued to rise. Now the freezer is closed, everything is hotter than before.
Later CNN adds that some scientists are concerned “climate change might be progressing in ways climate models have not predicted.”
One surprising reason could be the reduction of aerosols in the atmosphere. In 2020, regulations were introduced to limit the amount of sulfur in the fuel ships used — a policy aimed at addressing air pollution. Though air pollution has a significant impact on human health, it also acts as an artificial sunscreen and reflects sunlight away from the Earth. One theory is the absence of aerosols may have turned up the heat, said Karina von Schuckmann [an oceanographer at Mercator Ocean International in France].
Read more of this story at Slashdot.
Scientists Might Have Found the Best Way to Catcall a Cat
Scientists in France might have just found the most effective way to catcall an unfamiliar cat. The team discovered that cats living at a cat cafe responded most quickly to a human stranger when the stranger used both vocal and visual cues to get their attention. The cats also appeared to be more stressed out when the…
Scientists observe elusive missing step in photosynthesis’ final stage
Researchers at the SLAC National Accelerator Laboratory and Lawrence Berkeley National Laboratory (along with collaborators in Sweden, Germany and the UK) have shed new light on the final step of photosynthesis. They observed in atomic detail how Photosystem II, a protein complex found in plants, undergoes a transformation that leads to the loss of an extra oxygen atom. Scientists believe the discoveries will help provide a roadmap for optimizing clean energy sources. “It’s really going to change the way we think about Photosystem II,” said Uwe Bergmann, scientist and professor at the University of Wisconsin-Madison, who co-authored the paper.
Researchers took “extremely high-resolution images” of different stages of the process (at room temperature), giving them new insight into specifically how and where the oxygen is produced. Baseball can provide a simple (if somewhat forced) metaphor to illustrate the process. “The center cycles through four stable oxidation states, known as S0 through S3, when exposed to sunlight,” SLAC explains. “On a baseball field, S0 would be the start of the game when a player on home base is ready to go to bat. S1-S3 would be players on first, second, and third.” Based on this metaphor, a batter making contact to advance the runners signifies the complex absorbing a sunlight photon. “When the fourth ball is hit, the player slides into home, scoring a run or, in the case of Photosystem II, releasing one molecule of breathable oxygen.” It’s that final stage (S4, between third base and sliding home in our metaphor) that they imaged for the first time, where two oxygen atoms bond to release an oxygen molecule, revealing additional steps previously unseen.
The video below illustrates the team’s process and discoveries.
“Most of the process that produces breathable oxygen happens in this last step,” said Vittal Yachandra, a scientist at Berkeley Lab and co-author of the paper, published inNature. “But there are several things happening at different parts of Photosystem II and they all have to come together in the end for the reaction to succeed. Just like how in baseball, factors like the location of the ball and the position of the basemen and fielders affect the moves a player takes to get to home base, the protein environment around the catalytic center influences how this reaction plays out.”
The researchers expect an X-ray upgrade later this year to shed more light on the process. It will use a repetition rate of up to a million pulses per second, up from the 120 per second used in this experiment. “With these upgrades, we will be able to collect several days’ worth of data in just a few hours,” Bergmann said. “We will also be able to use soft X-rays to further understand the chemical changes happening in the system. These new capabilities will continue to drive this research forward and shed new light on photosynthesis.”
The team believes the results will help them “develop artificial photosynthetic systems that mimic photosynthesis to harvest natural sunlight to convert carbon dioxide into hydrogen and carbon-based fuels.” Jan Kern, another co-author and scientist at Berkley Lab, said, “The more we learn about how nature does it, the closer we get to using those same principles in human-made processes, including ideas for artificial photosynthesis as a clean and sustainable energy source.”
This article originally appeared on Engadget at https://www.engadget.com/scientists-observe-elusive-missing-step-in-photosynthesis-final-stage-214947146.html?src=rss