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辽宁喉软骨模型
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钱江晚报

发布时间: 2025-06-06 12:23:01北京青年报社官方账号
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  辽宁喉软骨模型   

NASA has long been able to check out Mars on the ground with rovers and landers and from far above with orbital spacecraft. Now, it wants to prove that it can sustainably fly around the planet's thin atmosphere at low altitude -- with a tiny helicopter.NASA announced Friday it will send the Mars Helicopter to the Red Planet with the previously announced Mars 2020 rover, set to launch in two years from Florida.The hope is that aircraft like this one -- flying mechanical scouts -- will eventually give scientists another vantage point from which to observe Mars.The helicopter will be mankind's first attempt to fly a heavier-than-air craft -- think helicopter or airplane -- in an atmosphere other than Earth's, the space agency said.Its mission will be to take five test flights after it lands with the rover in February 2021. 839

  辽宁喉软骨模型   

MORGANTOWN, W.V. – Murder hornets have had their time in the spotlight. Now, scientists say they've discovered “zombie cicadas.”It's a playful name from researchers at West Virginia University, who say they've found that a parasitic fungus, called Massospora, can play mind games on cicadas, causing them to infect others.Researcher showed that the psychedelic fungus can manipulate male cicadas into flicking their wings like females – a mating call – which tempts unsuspecting male cicadas and infects them.The fungus contains chemicals like those found in hallucinogenic mushrooms, according to research published in the journal PLOS Pathogens.“Essentially, the cicadas are luring others into becoming infected because their healthy counterparts are interested in mating,” said Brian Lovett, study co-author and post-doctoral researcher with the Davis College of Agriculture, Natural Resources and Design. “The bioactive compounds may manipulate the insect to stay awake and continue to transmit the pathogen for longer.”The authors of the study compared the effects of the fungus to a “B-horror movie.” Massospora spores gnaw away at a cicada’s genitals, butt and abdomen, replacing them with fungal spores. Then, Lovett says they “wear away like an eraser on a pencil.”Lovett also compared the transmission of the behavior-modifying virus to rabies. He says both rabies and entomopathogenic fungi enlist their living hosts for successful “active host transmission.”“When you're infected with rabies, you become aggressive, you become afraid of water and you don't swallow,” Lovett said. “The virus is passed through saliva and all of those symptoms essentially turn you into a rabies-spreading machine where you're more likely to bite people."In that sense, Lovett says many of us are familiar with active host transmission.“Since we are also animals like insects, we like to think we have complete control over our decisions and we take our freewill for granted,” he said. “But when these pathogens infect cicadas, it's very clear that the pathogen is pulling the behavioral levers of the cicada to cause it to do things which are not in the interest of the cicada but is very much in the interest of the pathogen.”Researchers say cicada nymphs could encounter Massospora in their 17th year as they emerge from the ground to molt into adults or on their way down to feed on roots for 17 years.“The fungus could more or less lay in wait inside its host for the next 17 years until something awakens it, perhaps a hormone cue, where it possibly lays dormant and asymptomatic in its cicada host,” said co-author Matthew Kasson.As grotesque as an infected decaying cicada sounds, researchers say they’re generally harmless to humans. They also reproduce at such a rate that the fungi’s extermination of hordes of cicadas has little effect on their overall population.“They're very docile,” Lovett said. “You can walk right up to one, pick it up to see if it has the fungus (a white to yellowish plug on its back end) and set it back down. They’re not a major pest in any way. They’re just a really interesting quirky insect that’s developed a bizarre lifestyle." 3172

  辽宁喉软骨模型   

MORGAN HILL, Calif. -- Authorities are investigating what exactly caused a plane to land on the freeway in the Bay Area Sunday morning, according to The Mercury News. The plane landed on Highway 101 near Morgan Hill around 11 a.m. The plane blocked one lane of the highway before authorities were able to tow it away.The Federal Aviation Administration said engine failure caused the emergency landing.Only the pilot was onboard and was uninjured, authorities confirmed. The plane was also undamaged.pic.twitter.com/fuRH7IQTWz— Charlene Nunes (@CharleneNunes) February 18, 2018 585

  

More proof that baby animals are just like children, video showing a nearly 4-month-old rhino at the Cincinnati Zoo playing in the mud during a rainstorm.The zoo shared a video on their Facebook page of Ajani Joe jumping, slipping and frolicking in the slick mud. 271

  

MINNEAPOLIS — Police say a man captured on surveillance video breaking windows at a south Minneapolis auto parts store in the days after George Floyd’s death is a Hell’s Angels member who was bent on stirring up social unrest.The man, seen in all black and carrying an umbrella, was dubbed “Umbrella Man” by many on social media.The video showed the man breaking windows at an Auto Zone near where Floyd died. Police say up until that point, the protests in the area had been peaceful.Soon after the windows were broken, the Auto Zone was set on fire — the first of several buildings in the area that were burned during riots. The fires caused an estimated 0 million in damage."Until the actions of the person your affiant has been calling 'Umbrella Man,' the protests had been relatively peaceful," police said in a search warrant affadvit, according to the Minneapolis Star Tribune. "The actions of this person created an atmosphere of hostility and tension. Your affiant believes that this individual's sole aim was to incite violence."The Star Tribune reports a Minneapolis police arson investigator wrote in a search warrant affidavit police identified the 32-year-old suspect through an emailed tip last week.A Minneapolis police spokesman tells The Associated Press the investigation is open and active. 1321

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