中山市那家医院肛瘘看的好(中山屁眼不舒服有事出血) (今日更新中)

If you're interested in fish who are scary-looking, poisonous and chock-full of elaborate defense mechanisms, look no further than the stonefish, a genus of fish that populate coastal waters of the Indo-Pacific region.As if their deadly venom and spiny exteriors weren't enough, scientists at the University of Kansas have found that stonefish also have a hidden switchblade on their face that they can flick out whenever they feel like they're in danger.Scientists call the bony, blade-like protrusion a "lachrymal saber," because it is located on a bone under the fish's eyes. Also, "lachrymal saber" is just a really metal-sounding name.William Leo Smith, associate curator and associate professor of ecology & evolutionary biology at KU, first started to understand how the lachrymal saber worked 15 years ago, when he was dissecting a stonefish he kept as a pet.This is a game-changerHe tells CNN the mechanism isn't just a cool new discovery (although it's that, too). It also changes the scientific understandings and classifications of this particular type of fish."It opens up these ideas of ecological questions. Muscular systems, bone systems, nervous systems all came together to form this. What led to its evolution or use?In other words, he says, "Why do we see this accumulation of so many horrible things on one fish?"The lachrymal saber is housed inside the fish's head, and they use their cheek muscles to deploy it. Though some stonefish are venomous, the saber is not.It could be a sex thing, tooSmith says he and his fellow researchers have reason to believe the saber isn't just for warding off predators: It could be a sex thing, too."There is evidence pushing towards that," he says. "They may use this in battles with other members of their species, like ram horns. It may also be involved in courtship behaviors."Oh, and the sabers glow."It's fluorescent green," Smith says. Since stonefish rely on camouflage for both protection and hunting prey, Smith doesn't think the fluorescence has a defensive purpose like, say, warning off predators.There are 134 described species of stonefish, and by Smith's observation, all of them have some form of lachrymal saber.  2202

In a stunning announcement to those in preparing to embark into medical school, New York University announced it would offer free tuition to all NYU medical program students — current and future.The reveal came during NYU School of Medicine's annual "White Coat Ceremony," where each new student is presented with a white lab coat to mark the start of their medical education and training.The bold offering is available to all current and future students in NYU's MD degree program, "regardless of need or merit.""Thanks to the extraordinary generosity of our trustees, alumni, and friends, our hope — and expectation — is that by making medical school accessible to a broader range of applicants, we will be a catalyst for transforming medical education nationwide," Kenneth G. Langone, Chair of the Board of Trustees of NYU Langone Health, said.The annual tuition costs covered by the scholarship is about ,000.NYU's free tuition initiative began with an endowment. So far, the university has raised more than 0 million of the roughly 0 million needed to fund full-tuition scholarships for all medical students "in perpetuity," according to ABC News.Crushing college debt strikes medical students particularly hard.About 75 percent of all doctors in the U.S. graduated with debt in 2017, the university said. The average cost for a private medical school is about ,605 a year. The median debt of a graduating student comes out to more about 2,000, NYU says."We believe that with our tuition-free initiative, we have taken a necessary, rational step that addresses a critical need to train the most talented physicians, unencumbered by crushing debt," said Robert I. Grossman, the Saul J. Farber Dean of NYU School of Medicine. "We hope that many other academic medical centers will soon choose to join us on this path." 1874

Hurricane Hunters have been flying in and out of Hurricane Delta continuously for days, getting a close-up look as the hurricane has re- intensified.Delta regained some of its previous fury. The hurricane, which was once a Category 4 before striking Mexico, dropped to a Category 1 on Wednesday. As the storm is set to strike the Louisiana coast on Friday, Delta has re-intensified into a Category 3 hurricane with top winds of 115 mph.As of Thursday evening, the hunters found that Delta had a 30-mile wide eye. Getting such detailed data from inside the hurricane can give forecasters a sense of the impact a hurricane will produce.There are two Air Force Reserve groups that fly into hurricanes to send back data to the National Hurricane Center.In total, the Air Force Reserve utilizes 20 WC-130J aircraft that are equipped with palletized meteorological data-gathering instruments.According to the Hurricane Hunters, “The navigator keeps track of the aircraft's position and movement and monitors radar to avoid tornadic activity. The flight meteorologist acts as flight director and observes and records meteorological data at flight level using a computer that encodes weather data every 30 seconds. The weather reconnaissance loadmaster collects and records vertical meteorological data using a parachute-borne sensor known as a dropsonde. It measures and encodes weather data down to the ocean surface.”The following videos were provided by Jemery DeHart on board one of the flights passing through the hurricane: 1530

IMPERIAL BEACH, Calif. (KGTV) — The man whose body was discovered floating off-shore in the South Bay this week has been identified.Zabiullah Rahmani, 29, was found after he entered the water near an Imperial Beach lifeguard tower during the early morning hours of Aug. 4. Officials said Rahmani was at the beach with a friend when he entered the water. The friend lost sight of him and a short time later, his body was found by joggers in the 700 block of Seacoast Drive.Paramedics pronounced Rahmani dead at the scene.At the time of discovery, the San Diego Sheriff's Department said drugs or alcohol may have played a role in Rahmani's death, but the Medical Examiner report didn't immediately offer a cause of death. 728

In a debate that featured frequent interruptions, President Donald Trump and former Vice President Joe Biden sparred for the first of three meetings between the two candidates.Despite frequent interruptions and personal attacks, several important questions on policy were asked, but not always answered.1) Biden opposes Green New DealBiden said he is not in favor of the so-called “Green New Deal,” and instead prefers the “Biden Plan.” But on Biden’s website, he says, “Biden believes the Green New Deal is a crucial framework for meeting the climate challenges we face.”During Tuesday’s debate, Biden said, "No, I don't support the Green New Deal. I support the Biden plan I put forward, which is different than what he calls the radical Green New Deal."When pressed on the cost of his plan, Biden said his plan would add millions of jobs."We are going to be in a position where we can create good jobs by making sure the environment is clean and we are all in better shape," Biden said.2) A vaccine is coming, Trump saysTrump said that the US will see coronavirus vaccines faster than some public health experts say the country should expect to see them.“We have our military that delivers soldiers and they can do 200,000 a day,” Trump said.Trump said that the federal response to the coroanvirus has saved thousands of lives."We got the gowns, we got the masks, we made ventilators, you wouldn't have made ventilators, and now we are weeks away from the vaccine, we are doing therapeutics already, fewer people are dying when they get sick, far fewer people are dying. We've done a great job," Trump said.3) Biden won’t answer if he’d pack the Supreme CourtAs Senate Democrats have toyed with the idea of adding Supreme Court justices if he is elected along with a Democratic-majority Senate, Biden would not answer whether he would agree with the plan.“Whatever position I take on that, that will become the issue,” Biden said. “The issue is, the American people should speak. You should go out and vote. You're in voting now.”Trump then pressed Biden to answer the question, Biden responded, "Will you shut up, man?"4) Trump lacks specifics on health care planTrump was pressed by moderator Chris Wallace to explain how he would replace the Affordable Care Act if given a second term. Trump has been trying to get the remaining provisions of the act revoked in federal court after getting the individual mandate struck down.Trump signed an executive order in July to offer Medicare prescription drug rebates. The effects of that rebate are too early to tell.“I'm cutting drug prices into going,” Trump said, "which no president has encouraged to do because you are going against big pharma. At the prices, they will be coming down 80 to 90%. You could have done it during your 47 year period in government, but you didn't do it. Nobody has done it.”“He has no plan for healthcare,” Biden responded. “He sends out wishful thinking. He has executive orders that have no power. He hasn't lowered drug costs for anybody. He has been promising the plan since he got elected. He has none, almost like everything else he talks about. He does not have a plan.”5) Biden, Trump disagree on trusting election resultsWhile Biden said he would accept the results of the upcoming election once the votes are counted, Trump would not make the same declaration.“The fact is I will accept it and he will too. You know why? Because once the winner is declared after all the, all the ballots are counted, all the votes are counted. That'll be the end of it. That will be the end of it,” Biden said.Trump said that the Supreme Court might need to be involved with the election.“ I think I'm counting on them to look at the ballots, definitely. I don't think, well, I hope we don't need them in terms of the election itself, but for the ballots, I think so," Trump said. 3864

来源：资阳报