安康孕前体检挂什么科(安康例假推迟多少天可以检查出怀孕) (今日更新中)

(CNN) -- Scientists have discovered a "monster black hole" so massive that, in theory, it shouldn't exist.It's a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.The findings were published by Chinese researchers in the journal Nature on Wednesday."Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," said Liu Jifeng, head of the team that made the discovery. "LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."Scientists are now scratching their heads at how LB-1 got so huge.The Chinese team has proposed a number of theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said -- instead, it could potentially be two smaller black holes orbiting each other.Another possibility is that it formed from a "fallback supernova." This is when a supernova -- the last stage of an exploding star -- ejects material during the explosion, which then falls back into the supernova, creating a black hole.This fallback formation is theoretically possible, but scientists have never been able to prove or observe it. If this is how LB-1 formed, then we may have "direct evidence for this process" for the first time, the study said.LB-1 is not the biggest black hole ever discovered -- but it may be the largest of its kind. There are several types of black holes, and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger -- they can be billions of times the mass of our sun.Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the massive star systems -- but it is still not clear exactly how, or which form first.Stellar renaissanceStellar black holes are believed to be commonly scattered across the universe, but they are difficult to detect because they do not normally emit X-rays -- only doing so when they gobble up gas from a star that has ventured close enough. They are so elusive that scientists have only found, identified, and measured about two dozen stellar black holes, the press release said.The researchers at the Chinese Academy of Sciences tried a different approach. Instead of looking for X-rays emitted by black holes, the team looked for stars that were orbiting some invisible object, being pulled in by its gravity.Their efforts paid off -- they soon spotted a giant star eight times heavier than the sun, orbiting around what turned out to be LB-1."This discovery forces us to re-examine our models of how stellar-mass black holes form," said David Reitze, a physicist at the University of Florida. In May, Reitze's team made its own breakthrough discovery -- observing the never-before-seen collision of a neutron star and a black hole, which sent out ripples in space and time.These twin discoveries -- the collision, and now LB-1 -- indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics," said Reitze in the press release.There have been several other discoveries over the past year that have added to this renaissance. In October, researchers discovered what they believe to be a new type of black hole, smaller than the other kinds. And earlier this week, astronomers discovered a black hole that is actually helping baby stars grow instead of destroying them. 3971

(KGTV) — Attorney General William Barr has decided to self-quarantine out of caution after President Donald Trump and several other lawmakers and aides tested positive for the coronavirus this week.Barr has had four COVID-19 tests since Friday and all have been negative, according to Justice Department spokesperson Kerri Kupec. She told the AP that Barr is quarantining out of an abundance of caution.Barr had attended one meeting at the Justice Department headquarters on Friday and stayed home during the weekend except to be tested.RELATED:President Trump drives by his supporters outside Walter Reed8 attendees of Trump's Supreme Court announcement test positive for the coronavirusLast weekend, Barr was one of several people to attend a White House event for Supreme Court nominee Amy Coney Barrett, where he was seen on video talking with former Trump aide Kellyanne Conway, who has since tested positive for the virus. Neither was wearing a mask.Many others in attendance were also not wearing a facial covering, as they sat close together throughout the ceremony. Since that event, at least eight people have tested positive for the coronavirus, including President Trump, first lady Melania Trump, Sens. Tom Tillis, and Mike Lee, Notre Dame President John I. Jenkins, Gov. Chris Christie, and Conway.The Associated Press contributed to this report. 1368

(KGTV) -- A class-action lawsuit has been filed in Maricopa County against Dr. Mario Almanza, a doctor who performs weight loss surgeries in Tijuana.There are more than 20 people and businesses named in the lawsuit. It also includes an Arizona woman believed to have been recruited for doctors in Mexico. It alleges fraud and negligent misrepresentation.Jessica Ballandby is a plaintiff in the class action lawsuit. She also filed her own lawsuit against Dr. Almanza and his alleged recruiter, Sandy Brimhall.Ballandby, a mother of two, got weight loss surgery with Dr. Almanza back in Tijuana back in March 2014. She said she experienced problems almost immediately.“I woke up from surgery and was feeling the most pain I’d ever felt in my life,” Ballandby said. “You could literally take my hoodie and ring it out and blood was dripping from it.”Ballandby blames Dr. Almanza, who claims to be the leading weight loss surgeon south of the border. After her surgery, she thought the worst.“I’m going to die over here. I’m never going to see my family again,” Ballandby remembers thinking.She admits she did not think twice about surgery in Mexico.“I was thinking long-term effects of being able to support my two kids,” Ballandby said.It is expensive in the United States and the gastric sleeve procedure came highly recommended and referred by Brimhall. In a 2015 interview, Brimhall said she collected 0 for people she sent to surgeons in Tijuana. Brimhall was with Ballandby in Mexico and admitted there were issues with her surgery.“When she crossed the border, she was having significant problems so she went to another bariatric center in Scottsdale and they told her he had nicked her intestines,” Brimhall said.In the court documents, it alleges that Brimhall used “high-pressure sales tactics” on people like Ballandby looking to lose weight and recommended doctors like Almanza.The class-action lawsuit also named Fill Centers USA and claimed Almanza was working with the business. The attorney representing Ballandby said Fill Centers USA would arrange trips to Mexico and aftercare in the U.S. for patients who received the Lap-Band surgery.“It would be a quick in and out. The surgeries would be done by doctors who are qualified and competent and that’s not what happened,” said Ballandby’s attorney, Robert Gregory.A trip to the emergency room delivered devastating news to Ballandby.“Your spleen’s been cut,” she said doctors told her. “He’s like, you’re bleeding internally.”Ballandby said she is now 102 pounds and has trouble keeping on weight. She also lost hundreds of thousands of dollars. She said none of it was covered by insurance because she chose to have surgery in Mexico.Brimhall was a school principal in Arizona. A records request showed she used her district email to recruit for surgeons across the border. Emails showed Brimhall recruited hundreds of people, escorted them to Mexico, used district resources to transmit HIPAA protected medical documents and started a business, making professional referrals allegedly based on her own experience having weight loss surgery in Mexico.Team 10 has confirmed four Americans died after having weight loss surgery with Dr. Almanza. In January 2016 during an interview with Team 10, he said he had performed more than 14,000 surgeries. Currently, his website now says over 16,000 surgeries have been performed.Dr. Almanza told Team 10 in 2016, the only patients he knew who passed away after surgery were the ones featured in Team 10 stories. He believes his unhappy patients were bribed by a disgruntled employee who wants to ruin his reputation.Ballandby compared Dr. Almanza’s operation to a “pig farm.”“That’s what he’s treating human beings over there like," she said. "Just like a pig. Slaughtering them." 3805

(CNN) - Joaquin "El Chapo" Guzman's complaining about lack of outdoor activity may be part of a plan to escape from detention before his sentencing next month, federal officials allege.An attorney for Guzman this month asked a federal judge to intervene over "cruel and unusual" prison conditions for the drug kingpin detained in a federal prison in New York.In the more than two years he's been detained, he's not had access to fresh air or natural sunlight, and is forced to put toilet paper in his ears to mask loud prison noise, his attorney wrote in a letter to the judge.The United States issued a response to the allegations Thursday, saying the only outdoor exercise space at the facility is a rooftop with a wire mesh covering.That facility was the site of a 1981 attempted jail break -- where an inmate's cohorts hijacked a sightseeing helicopter and attempted to cut open the wire mesh covering, the US said."In this case, any outdoor exercise time would be particularly problematic for this defendant," the US said." The defendant has successfully planned and executed elaborate escapes from two high-security penal institutions. As detailed at trial, one of the defendant's escapes involved the construction of a sophisticated, ventilated tunnel that stretched for over a mile. Certainly, an escape via rooftop, using a helicopter, or any related means would be elementary by comparison."He will be sentenced next monthGuzman, once the leader of a murderous drug cartel in Mexico, was convicted in February of running a criminal enterprise and other drug-related charges. He will be sentenced on June 25.He's been in US detention for 27 months, and is in solitary confinement in a 10-by-8-foot windowless cell in Manhattan, according to his defense attorney, Mariel Colon.In the letter to the judge, the attorney described what she called a series of punishments against the drug lord. The light is always on in his cell, leading to a "serious issue of sleep deprivation," she wrote.In addition to the lack of light, the air conditioning in his cell is so loud, he is unable to sleep through the noise, his attorney said. As a result, Guzman has been using toilet paper as earplugs, and he complains of daily headaches and ear pain that makes it impossible for him to use earphones."The reason for the restriction is simple: If there were an emergency, an inmate would not be able to hear the guards alerting the inmates to the problem. Inmates could also use the earplugs as a ruse to ignore, or pretend not to hear, the guards' orders," the government said.The defendant has a week to respond The attorney asked the judge to order the Bureau of Prisons to grant Guzman access to two hours of outdoor exercise a week, earplugs and the same food and drink offerings as other inmates.But the government said he has access to "several different types of exercise equipment, including an exercise bike and elliptical, and a vented window that provides the defendant with access to fresh, outdoor air and sunlight."The US Attorney's Office for the Eastern District of New York and the Bureau of Prisons declined to comment when reached by CNN this month. The judge had ordered the government to respond by May 23 and the defendant a week later.The government has called for Guzman to be placed under restrictive detention conditions to prevent him from running the Sinaloa Cartel from prison, coordinating an escape from prison, or directing attacks on individuals he believes are cooperating with the government, according to the filing. 3560

(KGTV) - Embattled Congressman Duncan Hunter faces more questions from the Federal Election Commission regarding campaign finances.The letter claims 4, 923.04 in un-itemized receipts were not reported properly. When contributions from an individual reach 0 for an election cycle, the itemization must include pertinent details.Hunter's spokesman claims the request for more information is commonplace and that many elected officials receive these notifications."Congressman Hunter's campaign has always complied with all regulations and reporting requirements concerning federal campaign laws akgwill continue to do so," said Michael Harrison.Hunter faces charges for misusing more than 0,000 of campaign finances and goes to court in the new year. RELATED:-- Prosecutors: How Hunter misused campaign funds-- Motion: Hunter spent campaign funds on "desire for intimacy"-- Judge allowing evidence of Hunter's alleged affairs at trial-- Former staffer claims Hunter groped her at DC party in 2014 1011

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