西安变频空调制冷制热综合实验台(装表接电工实训系统) (今日更新中)

As computers, tablets and cellphones have become a growing part of our lives, the exposure to blue light emitted from these devices increases. While blue light exposure has been known to cause strain in eyes, Oregon State University researchers studied the effect of blue light exposure on aging. Based on to their findings, exposure to blue light could cause aging to accelerate. For their study, researchers used common fruit flies and exposed them to 12 hours of blue LED light and 12 hours of darkness. To compare, researchers kept a group of flies in total darkness, as well as a group of flies that were exposed to light that had the blue wavelengths filtered out. The researchers said they chose fruit flies because their cellular and developmental mechanisms are similar to humans.The researchers said that flies exposed to blue LED light sustained damage to their retinal cells and brain neurons and had impaired locomotion. Even more stunning, some of the flies, which exhibited some brain damage, were mutants that did not develop eyes."The fact that the light was accelerating aging in the flies was very surprising to us at first,” said Jaga Giebultowicz, a professor of integrative biology at Oregon State. “We’d measured expression of some genes in old flies, and found that stress-response, protective genes were expressed if flies were kept in light. "We hypothesized that light was regulating those genes. Then we started asking, 'what is it in the light that is harmful to them,' and we looked at the spectrum of light. It was very clear cut that although light without blue slightly shortened their lifespan, just blue light alone shortened their lifespan very dramatically.” 1708

Breaking overnight: Detectives bust a man for sneaking 84 lbs of marijuana packaged in #xmas wrapping paper into @Fly_Nashville. More details on @NC5 this morning. #Nashville #BNA pic.twitter.com/raLnOsy9SL— Mo Haider (@mhaider_NC5) December 17, 2019 262

Authorities are investigating after a 12-year-old boy died after being struck by a school bus in Goodyear, Arizona, on Friday.Goodyear fire officials said the crash happened around 4 p.m. outside of Western Sky Middle School.Police say the boy was rushed to a pediatric trauma hospital in extremely critical condition, but later died from his injuries.Information about what led up to the crash was not immediately available.The driver remained at the scene and was cooperating with investigators, police said.Police say there were students on the bus at the time of the crash. No other injuries are suspected. 622

At an elevation above 8,000 feet, Aspen Ruggerfest is taking the sport of rugby to new heights.This four-day tournament attracts athletes of all ages and genders, with players looking to show off their skills against some of the best competition in the country.“There’s a lot of US players still out here in Ruggerfest,” said Alec Parker.Parker is an Aspen legend. He’s played for his hometown team, the Gentlemen of Aspen Rugby Football Club, and represented the United States in four Rugby World Cups.Now, retired from rugby, Parker says playing in the Aspen Ruggerfest is equally as important as playing internationally.“I love this weekend. It’s the best,” Parker said of Aspen Ruggerfest. “Best weekend of the year for sure.”Now in it’s 52nd year, Aspen Ruggerfest continues to grow by attracting athletes from across the country and across the world.“The sport is fun as hell,” said former Aspen RFC coach Freddie Waititi.Waititi says rugby is the fastest growing team sport in the country, and the numbers support it. In 2014, the Sports and Fitness Industry Association reported a 350 percent growth in participation over a five-year period.“It’s fun watching the young guys that we coach being able to pick up the things that we are trying to pass on to them and actually use them,” Waititi said.Despite more people now playing their favorite sport, the Aspen team is mourning the loss of one of its own.“It’s quite a weird one this year,” said one an Aspen player. “We’re missing one very important person that’s been a part of Aspen rugby for longer than I can even remember.” On the night before the Gents first match, the team held a team dinner and dedicated it Jerry Hatem, a former Aspen player-coach, who lost his life in a snowmobile accident this summer.“(Jerry) would be sitting here having a beer after lining the field for the whole day with bruises blood all over his face,” the Aspen player said. “He just loves rugby and is a great guy.”This a game that transcends athletics, with players saying their teams are more like their families. And when the Aspen Gents took the pitch, Hatem’s family was watching from the sidelines, saying jerry would be proud.“(Jerry’s) saying it by what we’re witnessing here,” said Mike Hatem, Jerry’s brother. “This whole community just comes together.” Because whether rookie or old boy, local or import, rugby culture is all about camaraderie, and Aspen Ruggerfest embodies that, at a higher level. 2470

An employee in the Bureau of Alcohol, Tobacco, Firearms and Explosives headquarters building Thursday opened a package that contained a liquid substance and the employee said she felt sick right after opening it, according to law enforcement officials.It is not clear what the substance is, one of the officials told CNN. The mail is screened off site so it is unclear if this package was delivered some other way or if it made it through screening, said one official.The headquarters in Washington, DC, was evacuated after the suspicious package was discovered.A HAZMAT crew responded to the scene and left the building shortly before 4:40 p.m. Thursday, according to April Langwell, the head of ATF Public Affairs.Langwell said that the field test of the substance is "clear" and they are sending the substance that was found in an envelope opened by an employee to a lab for further analysis. She said the package was "not the usual suspicious package."Langwell told CNN that it appears that only one person was affected by the package, which was opened at about 2:30 p.m. Thursday.There were still first responders in the building as of 5 p.m. Thursday, but people were being allowed back into the building.Police, firefighters and paramedics from Washington, DC, responded to the scene. 1303

来源：资阳报