郑州300度最便宜的近视镜多少钱?(郑州卫辉市眼科医院) (今日更新中)

Scientists have accidentally developed a plastic-eating enzyme that may be used to combat one of the world's worst pollution problems.Researchers from Britain's University of Portsmouth and the US Department of Energy's National Renewable Energy Laboratory (NREL) made the discovery while examining the structure of a natural enzyme found in a waste recycling center a few years ago in Japan.They say the enzyme, Ideonella sakaiensis 201-F6, is able to "eat" polyethylene terephthalate, PET, which was patented as a plastic in the 1940s and is used in millions of tons of plastic bottles. 596

Scientists, doctors and the public are eagerly waiting to hear how effective a COVID-19 vaccine will be and how soon it could be available to everyone. But when the vaccine is ready, some will be racing to be first in line, while others will be cautiously waiting to see how it plays out."Only about half of people get a flu vaccination polls are showing. In terms of the coronavirus, that’s saying that a third to maybe as much as half of the population will not want to get a vaccine," said Arthur Evans, the CEO of the American Psychological Association.Evans is concerned about whether people will be willing to get the COVID-19 vaccine when it comes out. How people are educated about the upcoming vaccine will be crucial."Right now, I think there are a lot of people who want to take a vaccine and to get a vaccine, but if people feel that this has been rushed, that they don’t feel all of the normal safety measures have been taken, it's going to be much harder for people to take that step," explained Evans.Dr. Bali Pulendran, a pathology, microbiology and immunology professor at Stanford University, says just because a COVID-19 vaccine is being expedited doesn't mean it's any less safe."It's a very established, lengthy process. It’s expedited now because of certain technologies such as the mRNA technology that really helps you accelerate this process," said Dr. Pulendran.He says the creation of a vaccine is rigorously tested, first with mice, then primates, and finally, humans. Tens of thousands of people are currently choosing to participate in COVID-19 vaccine trials."And so, this is a development and paradigm that has served vaccinology really well. It's really served it well in terms of enabling the licensure of some 20 or more vaccines," said Dr. Pulendran.Dr. Pulendran says every year, the flu vaccine varies in efficacy. For a good year, it could be 90 percent protective, while the next year, the flu shot may only be 10 percent effective. The COVID-19 vaccine is expected to be 60 percent effective."I think for me, personally, if I saw a vaccine coming out in the next year or so that had a 60 to 70 percent efficacy, that to me would be very encouraging," said Dr. Pulendran.The public, though, may still need some convincing."One of the hardest things for the general public to embrace is the idea of probability. We like to know definitively if something works or not,” said Evans. “The reality is that a vaccine is a probabilistic issue. It's highly likely that you won’t contract, whatever the condition is, but it’s not 100 percent."Evans says the key will be in how the vaccine is marketed to the American public.Dr. Pulendran hopes any positive data and outcomes of the COVID-19 vaccine trial will encourage as many people as possible to get the vaccine when it comes out. 2823

Scientists are warning that a domino effect will kick in if global temperatures rise more than 2 degrees Celsius above pre-industrial levels, leading to "hothouse" conditions and higher sea levels, making some areas on Earth uninhabitable.The report, "Trajectories of the Earth System in the Anthropocene," published Monday in the American Proceedings of the National Academy of Sciences, said "hothouse" temperatures could stabilize 4 degrees to 5 degrees Celsius (39 to 41 Fahrenheit) higher than pre-industrial levels."Human emissions of greenhouse gas are not the sole determinant of temperature on Earth. Our study suggests that human-induced global warming of 2 degrees Celsius may trigger other Earth system processes, often called 'feedbacks,' that can drive further warming -- even if we stop emitting greenhouse gases," lead author Will Steffen of the Australian National University said. 911

SAN YSIDRO, Calif. (KGTV) — San Diego County will set up a coronavirus testing site at one of the world's busiest border crossings.County Supervisor Greg Cox said Wednesday the testing site will be at San Ysidro Port of Entry's PedWest crossing and serve about 200 tests daily. The testing site will be used for essential workers coming into the U.S. from Mexico and returning U.S. citizens. The walk-up site will also be appointment-free.PedWest serves pedestrians between Tijuana and San Diego. 504

SANTEE, Calif. (KGTV) — Cameras caught a thief wreaking havoc at an East County business park, culminating in several destructive acts after he realized he was locked in.Scott Trafton has seen the video countless times, but his emotions have yet to lessen."Aggravating and makes me angry," said Trafton, who owns XP Builders.Just before midnight last Thursday night, a truck is seen driving into a business park on Wheatlands Court. The truck, believed to be a Chevy Silverado, is parked in the dark for more than four hours, before a man emerges and heads toward Trafton's general contractor business. In the video, the man grabs items from the truck bed, before prying open a toolbox in the back. A knife at this side, the man would get away with more than a thousand dollars with of Trafton's tools. "It hurts being a small business. Every penny counts," said Trafton.Trafton is not the only victim. The thief left behind a trail of shattered truck windows and missing items."Basically took whatever wasn't bolted down," said Trafton.When the man went to leave, he was met by a gate, locked by someone who had left earlier. The camera spies him apparently chaining his truck to the fence and pulling forward, but he can't get the fence down."He then came over to another truck and broke a window. He then took a moving blanket to protect his truck and drove to another fence," said Trafton.In the video, you can see the flash of his lights, before his final act."He ran into the fence, spread it wide open and knocked it over," said Trafton.The repair bill will tally some ,000. Trafton worries about what the thief may do next."He doesn't care about the aftermath, as long as he gets what he wants," said Trafton.Anyone with information is asked to call the Santee sheriff's substation at 619-956-4000. 1818

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