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济南男科医院那家比较好
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发布时间: 2025-05-25 20:14:50北京青年报社官方账号
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A new study takes a look at how deep the problem of plastics in the ocean goes. Studies have looked at the quantity and spread of plastics in the world’s oceans, and now scientists are getting a better idea of how much of that litter is sinking down to the sea bed.The study, from Australia’s national science agency CSIRO, estimates there is 14 million metric tons of microplastics sitting on the ocean floor. That would be more than 35x as much plastic scientists believe is floating on the surface of the ocean.Microplastics are defined as pieces of plastic that have been worn down by the ocean and other elements into tiny fragments, smaller than 5 millimeters.The team collected samples of deep-sea sediments up to 9,800 feet deep from sites around the Great Australian Bight off the coast of South Australia. The robotic submarine took 51 samples.Scientists found an average of 1.26 microplastic pieces per gram of sediment in the samples.Dr. Denise Hardesty, Principal Research Scientist and co-author of the study, said they were "surprised to observe high microplastic loads in such a remote location.""Our research found that the deep ocean is a sink for microplastics," Hardesty said. "By identifying where and how much microplastic there is, we get a better picture of the extent of the problem."Around 150 million metric tons of plastic are already floating in our oceans -- with an additional eight million tons entering the water each year, according to the World Economic Forum.The researchers say most of the plastic dumped into the ocean likely ends up on the coasts, rather than on the ocean's surface or floor.The samples were taken in the spring of 2017; the study was published in Frontiers in Marine Science on Monday. 1750

  济南男科医院那家比较好   

A recently published study looks at the potential of asymptomatic spread at grocery stores and the psychological distress of these essential workers.Researchers looked at a grocery store in the Boston area in May. They found 20 percent of the 104 employees tested positive for the coronavirus. This rate was significantly higher than the infection rate in the surrounding community, which was only reporting a positive rate of around 1 percent at the time.More than 75 percent of those who tested positive reported having no symptoms.Those employees who interacted with customers were five times as likely to test positive for COVID-19 compared to employees in other positions."We were definitely surprised to see that there were that many people that were asymptomatic," Dr. Justin Yang, an assistant professor at Boston University School of Medicine and a researcher at Harvard School of Public Health who worked on the study told CNN. "This is definitely very alarming as it means that retail grocery store employees are exposed to customers and sort of serve as a middleman for the virus - like a super spreader almost."The study also looked at feelings of anxiety and depression among the grocery store employees.About 24 percent of all employees reported feeling at least mild anxiety. The data suggests employees who were able to remain socially distant while at work had a lower rate of anxiety; 76 percent of those who reported having no anxiety were able to keep spacing while at work.Whereas 46 percent of those who did report having anxiety were unable to stay socially distant from coworkers or customers while on the job.About 8 percent of employees screened positive for at least mild depression symptoms on a self-reported questionnaire. Those who could not practice social distancing at work and commuted by public transportation were more likely to screen positive for depression.As a conclusion, the team of researchers hopes their findings are a call to action for providing comprehensive employee assistance services to help essential workers in all industries “cope with the psychological distress during the COVID-19 pandemic.”The study was published in the Journal of Occupational and Environmental Medicine. 2241

  济南男科医院那家比较好   

A North Korean soldier was shot by his former comrades while defecting to South Korea across the demilitarized zone, Seoul's Joint Chiefs of Staff said in a statement Monday.The wounded soldier was evacuated from the site for emergency medical attention, the statement said, after defecting from a North Korean guard post at the Joint Security Area (JSA) on the heavily-guarded border between the two countries.The soldier is reported to have left the North Korean guard post in front of Panmungak, on the border inside the demilitarized zone (DMZ), and proceeded to move towards Freedom House on the South Korean side. 627

  

A man’s love for man’s best friend is a powerful force. Kaleb Benham from Grass Valley took on a 350 pound bear that was attacking his rescue dog, “Buddy.” Kaleb said he heard a growl the saw the bear dragging buddy “by his head.” So he tackled the bear and punched it pic.twitter.com/XAhTrS2AEC— Anna Giles (@AnnaGilesTV) December 4, 2020 347

  

A Republican congressman said Thursday that Congress should debate authorizing military force in Syria, following the President's comments suggesting he'd take action there soon."If we're going to escalate this to a great degree, it seems to me you've got to have this debate in Congress. That's what the Constitution clearly spells out. Let's have that debate," Rep. Jim Jordan, an Ohio Republican who serves on the conservative and libertarian-leaning Freedom Caucus, told CNN's "New Day."The comment comes after Trump on Thursday followed up on his assertion that "Russia vows to shoot down any and all missiles fired at Syria. Get ready Russia, because they will be coming." 686

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