太原肛门坠胀想大便(山西肛肠专家推荐) (今日更新中)

After almost two years circling an ancient asteroid hundreds of millions of miles away, a NASA spacecraft this week will attempt to descend to the treacherous, boulder-packed surface and snatch a handful of rubble.The drama unfolds Tuesday as the U.S. takes its first crack at collecting asteroid samples for return to Earth, a feat accomplished so far only by Japan.Brimming with names inspired by Egyptian mythology, the Osiris-Rex mission is looking to bring back at least 2 ounces (60 grams) worth of asteroid Bennu, the biggest otherworldly haul from beyond the moon.The van-sized spacecraft is aiming for the relatively flat middle of a tennis court-sized crater named Nightingale — a spot comparable to a few parking places here on Earth. Boulders as big as buildings loom over the targeted touchdown zone.“So for some perspective, the next time you park your car in front of your house or in front of a coffee shop and walk inside, think about the challenge of navigating Osiris-Rex into one of these spots from 200 million miles away,” said NASA’s deputy project manager Mike Moreau.Once it drops out of its half-mile-high (0.75 kilometer-high) orbit around Bennu, the spacecraft will take a deliberate four hours to make it all the way down, to just above the surface.Then the action cranks up when Osiris-Rex’s 11-foot (3.4-meter) arm reaches out and touches Bennu. Contact should last five to 10 seconds, just long enough to shoot out pressurized nitrogen gas and suck up the churned dirt and gravel. Programmed in advance, the spacecraft will operate autonomously during the unprecedented touch-and-go maneuver. With an 18-minute lag in radio communication each way, ground controllers for spacecraft builder Lockheed Martin near Denver can’t intervene.If the first attempt doesn’t work, Osiris-Rex can try again. Any collected samples won’t reach Earth until 2023.While NASA has brought back comet dust and solar wind particles, it’s never attempted to sample one of the nearly 1 million known asteroids lurking in our solar system until now. Japan, meanwhile, expects to get samples from asteroid Ryugu in December — in the milligrams at most — 10 years after bringing back specks from asteroid Itokawa.Bennu is an asteroid picker’s paradise.The big, black, roundish, carbon-rich space rock — taller than New York’s Empire State Building — was around when our solar system was forming 4.5 billion years ago. Scientists consider it a time capsule full of pristine building blocks that could help explain how life formed on Earth and possibly elsewhere.“This is all about understanding our origins,” said the mission’s principal scientist, Dante Lauretta of the University of Arizona.There also are selfish reasons for getting to know Bennu better.The solar-orbiting asteroid, which swings by Earth every six years, could take aim at us late in the next century. NASA puts the odds of an impact at 1-in-2,700. The more scientists know about potentially menacing asteroids like Bennu, the safer Earth will be.When Osiris-Rex blasted off in 2016 on the more than 0 million mission, scientists envisioned sandy stretches at Bennu. So the spacecraft was designed to ingest small pebbles less than an inch (2 centimeters) across.Scientists were stunned to find massive rocks and chunky gravel all over the place when the spacecraft arrived in 2018. And pebbles were occasionally seen shooting off the asteroid, falling back and sometimes ricocheting off again in a cosmic game of ping-pong.With so much rough terrain, engineers scrambled to aim for a tighter spot than originally anticipated. Nightingale Crater, the prime target, appears to have the biggest abundance of fine grains, but boulders still abound, including one dubbed Mount Doom.Then COVID-19 struck.The team fell behind and bumped the second and final touch-and-go dress rehearsal for the spacecraft to August. That pushed the sample grab to October.“Returning a sample is hard,” said NASA’s science mission chief, Thomas Zurbuchen. “The COVID made it even harder.”Osiris-Rex has three bottles of nitrogen gas, which means it can touch down three times — no more.The spacecraft automatically will back away if it encounters unexpected hazards like big rocks that could cause it to tip over. And there’s a chance it will touch down safely, but fail to collect enough rubble.In either case, the spacecraft would return to orbit around Bennu and try again in January at another location.With the first try finally here, Lauretta is worried, nervous, excited “and confident we have done everything possible to ensure a safe sampling.”___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 4807

Aaron Hernandez, the former NFL star who took his life while serving a murder sentence in prison, had chronic traumatic encephalopathy -- commonly known as CTE -- attorney Jose Baez said Thursday.Baez cited study results compiled by the Boston University CTE Center, which examined Hernandez's brain for the neurodegenerative brain disease.Hernandez played for the New England Patriots from 2010 to 2012 after a standout collegiate career at the University of Florida.According to a statement from BU, Hernandez's brain was examined by Dr. Ann McKee, director of the CTE Center. The neurodegenerative brain disease has Alzheimer's-like symptoms, including memory loss, confusion, aggression, rage and, at times, suicidal behavior. It is believed to result from repeated trauma to the head, which results in a buildup of the abnormal protein tau that clumps in the brain.The disease is categorized in four degrees, with Stage 4 being the most severe. According to McKee's analysis, Hernandez was found to have Stage 3 CTE, which is commonly associated with cognitive and memory loss, as well as behavioral changes and impaired judgment. Hernandez was found to have early degeneration of brain cells and large tears in the septum pellucidum, a central membrane of the brain.The CTE Center statement added that he had "severe deposition of tau protein in the frontal lobes of the brain" as well as a "deposition of tau protein in nerve cells around small blood vessels, a unique feature of CTE."The initial examination was confirmed by a second neuropathologist at Boston University.CTE can be diagnosed only after death. Researchers are working on ways to detect it in the living, with the hope of being able to treat it one day.Hernandez hanged himself in prison in April. He was 27."Aaron suffered from a severe case of CTE," Baez said. "Not only were the results positive, but we're told that it was the most severe case they had ever seen for someone of Aaron's age."A representative for Boston University's CTE Center did not confirm to CNN that it was the most severe case it had seen and said, "We have nothing further to add."A federal lawsuit suing the National Football League and the New England Patriots was filed Thursday by Shayanna Jenkins Hernandez, Hernandez's fiancee, on behalf of their daughter, Avielle. The lawsuit seeks million."The NFL had made certain representations to players during this time that Aaron was playing (2010 to 2012) and those representations turned out to be false," Baez said.The NFL said it cannot comment about the lawsuit at this time. The Patriots have not responded to a request for comment.In 2015, a federal judge approved a class-action lawsuit settlement between the NFL and thousands of former players who accused the league of hiding the dangers of concussions and repeated head trauma. The agreement provides up to million per retired player for serious medical conditions associated with repeated head trauma.CTE has been detected in veterans, as well as players of other contact sports; however, it has become most associated with football. It has been diagnosed in San Diego Charger and Hall of Famer Junior Seau, as well as the Philadelphia Eagles' Kevin Turner and the Oakland Raiders' Ken Stabler.A recent analysis by BU found evidence of CTE in 110 of 111 brains of former NFL players. However, there is a potential bias in this review, as relatives of these players may have submitted their brains for diagnosis due to clinical symptoms noticed while the players were living. 3577

Actress Katherine "Scottie" MacGregor, who played Harriet Oleson on "Little House on the Prairie," died on Tuesday at age 93 in Woodland Hills, Calif., a representative confirmed to NBC News. MacGregor was credited in 153 of Little House on the Prairie's 203 episodes. The show portrayed a family living on a Minnesota farm. MacGregor's Oleson was the general store owner's wife, and she played a character who had a bit of sass. When the show ended in 1983, MacGregor largely stepped away from acting after a three-decade career in the field. MacGregor's co-star on Little House on the Prairie Melissa Gilbert saluted MacGregor with an Instagram post on Wednesday. "She was outspoken and hilariously funny," Gilbert wrote. "A truly gifted actress as she was able to play a despicable character but with so much heart. Her Harriet Oleson was the woman our fans loved to hate. A perfect antagonist. The thing people outside of our prairie family didn’t know, was how loving and nurturing she was with the younger cast."A cause of death was not announced.  1132

After former New Jersey Gov. Chris Christie’s stay in the hospital, Christie told the New York Times on Thursday he was “wrong” not to wear a mask inside the White House before becoming infected with the coronavirus.Christie, President Donald Trump, and a number of others who had contact with Trump and his staff, tested positive for the coronavirus several weeks ago. Christie spent nearly a week in the hospital, and he told the New York Times he was in the intensive care unit.Christie, who has since been released from the hospital and is recovering, expressed regret for his actions inside of the White House. Christie was among a group of GOP advisers helping Trump with preparing for the Sept. 30 debate.“I believed when I entered the White House grounds, that I had entered a safe zone, due to the testing that I and many others underwent every day,” Christie said in the statement to the New York Times. “I was wrong. I was wrong not to wear a mask at the Amy Coney Barrett announcement and I was wrong not to wear a mask at my multiple debate prep sessions with the president and the rest of the team."Christie said that the public should take the virus seriously.“I hope that my experience shows my fellow citizens that you should follow CDC guidelines in public no matter where you are and wear a mask to protect yourself and others,” he told the Times.Kellyanne Conway, who also was on Trump’s debate prep team, tested positive for the coronavirus.A contingent of others who attended Barrett’s nomination ceremony tested positive for the virus, including three US senators, Notre Dame President John Jenkins, and an unnamed White House journalist.The virus also reached others in the presidential family, with both first lady Melania Trump and son Barron Trump testing positive. Other aides, including Kayleigh McEnany, Hope Hicks, and Stephen Miller, also confirmed they tested positive for the virus.While Christie came to terms with the seriousness of his infection, Trump has largely brushed off his ailment. Trump was rushed to the hospital by Marine One on October 2, and he stayed there for nearly 72 hours. Presidential physician Dr. Sean Conley released multiple statements downplaying Trump’s prognosis, only for Conley to later reveal more serious details of Trump’s diagnosis.It was learned in the days following Trump’s positive coronavirus test that he ran a significantly high fever and needed supplemental oxygen.Following his 10-day isolation period, Trump immediately held a public event at the White House, inviting hundreds of people who sat shoulder to shoulder, many of whom without masks. He then has been holding rallies on a daily basis since Monday.Dr. Anthony Fauci said that holding such events is risky."I think the — the data speaks for themselves," Fauci to CBS News about wearing masks. "We had a super-spreader event in the White House and it was in a situation where people were crowded together and were not wearing masks. So the data speak for themselves." 3014

Airports are doing everything possible to get people back in the air and one major component is testing for COVID-19. A handful of airports across the country are now offering tests for passengers.It's no secret that the global pandemic has turned the travel and airline industry upside down. The Airport Council International North America is known as the "voice of airports."“I look at airports, at cities within cities and anything that would affect the city would affect the airport and that’s what we do,” says CEO Kevin Burke.“Testing is that key that unlocks travel,” he added.Tampa International Airport was the first to jump on board with a program that was the first-of-its-kind in the nation. They offer both the PCR and rapid tests to anyone with proof of travel.“We’ve tested more than 4,100 passengers. It's gained in popularity. Passengers know we’re providing the testing at the airport and I will tell you before they open at 7:30 every morning, there’s 20 plus passengers waiting in line," says John Tiliacos, executive VP of airport operations.He said they launched the program in early October in hopes of instilling confidence and encouraging travel."Given the environment we’re in with this pandemic, we’ve got to do everything we can as an industry both airline or airport industry. We’ve got to do everything we can to breathe life back into this industry and get it back up on its feet and running again,” Tiliacos said.Since then, they've fielded calls from other airports inquiring about the program. If a passenger gets a negative test, they go on about their day. But, if it's positive, ACI-NA says, it's not the airports' responsibility to escort the passenger out.“They’ve gotten very few passengers that have tested positive but they’ve had a couple and they can’t proceed past that because TSA is not going to let them through a checkpoint with a positive read," said Burke.While an increase in testing is a good thing, doctors advise that it's not a guarantee by any means.“This test isn’t an insurance policy for the rest of the week, the rest of the month or the rest of your life, it tells you what your status is right now,” says Dr. Beth Thielen, an infectious disease physician and assistant professor of pediatrics at the University of Minnesota Medical School.“For example, if you went to a bar the night before you flew and you were around 100 people without masks, you potentially could be infected, but if you take a test at the airport the next day, you may very well test negative and a week down the road, you may develop symptoms and be capable of spreading COVID,” says Dr. Thielen.But she also says this program is a start, and it helps people make better decisions about what they're doing and where they're going. ACI-NA says testing, masks, social distancing, hand washing and cleaning all play an important role in getting people back on board."If our industry is going to survive and thrive when a vaccine is there and people come back to travel, we have to take the steps now to make people comfortable not only now but in the future when they’re booking future travel,” said Burke.While airlines are trying to instill confidence in air travel, many public health experts are advising against traveling as coronavirus cases spike throughout the US.Earlier this week, The CDC recommended Americans not travel for Thanksgiving during the current spike in coronavirus cases nationwide.“As cases continue to increase rapidly across the United States, the safest way to celebrate Thanksgiving is to celebrate at home with the people you live with,” the Centers for Disease Control and Prevention website reads. “Travel may increase your chance of getting and spreading COVID-19. Postponing travel and staying home is the best way to protect yourself and others this year.”The CDC recommends those who travel to follow all of their guidance for slowing the spread of coronavirus: wear a mask, wash hands, social distance, get the flu shot, and bring extra masks and hand sanitizer. 4040

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