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2019年02月19日 02:11:03    日报  参与评论()人

全南县妇幼保健人民医院脱毛多少钱会昌县做处女膜修复多少钱赣州俪人整形美容医院塑鼻尖怎么样 Don: Today on ;A Moment of Science,; herring make sounds when passing gas...唐:今日科学时刻,鲱鱼放屁时会发出声音...Yael: Don, be serious!雅艾尔:唐,正经点!Don: I am serious, Yael! The Atlantic herring is one of the most abundant fish on Earth!The silvery foot-long fish live in huge schools of thousands to hundreds of thousands of individuals.唐:我很正经啊,雅艾尔!大西洋的鲱鱼是世界上数量最多的鱼类之一!这种银白色的长足鱼成群而居,每一群都有成百上千条鲱鱼。Fishermen have long known that herring schools can release large clouds of bubbles that are visible from the surface. The bubbles are released through the anal opening, connected to the fishs swim bladder.人们早就知道鲱鱼群会吐出巨大的从水面都能看见的气泡云。这些气泡来自于鱼鳔,通过释放。Yael: Whats a swim bladder?雅艾尔:什么是鱼鳔?Don: Its a special, gas-filled organ that helps regulate buoyancy. Herring gulp air at the surface and store it in their swim bladders. Its also long been known that herring make chirp-like sounds, especially when startled or in danger, but biologists didnt know how these chirps were produced.唐:它是一种特殊的充满气体的器官,有助于调节鱼体的浮力。鲱鱼在水面大口吸气,把氧气存在鱼鳔里。很早以前人们也知道鲱鱼会发出类似啾啾的声音,尤其在受到惊吓或者遇到危险时。但那时生物学家们并不知道这种啾啾声是如何产生的。Yael: I think I know where this is heading!雅艾尔:我大概知道接下来你要说什么了!Don: Yep! A pair of Danish biologists recorded herring housed in special pressurized tanks that replicated conditions at the ocean depths where herring are found. They discovered that the chirping sounds were actually produced by air release from the swim bladder during the bubble production—the first report of sound production by gas release in fishes.唐:没错!两位丹麦生物学家研究记录了一群鲱鱼,为了仿造了鲱鱼出没的深海环境,他们把鲱鱼养在特殊增压箱里的。他们发现啾啾声实际上是在鱼鳔释放气体,产生气泡时发出的,这是人类第一个有关鱼类释放气体发声的报告。Yael: So the chirps are just a by-product of passing gas?雅艾尔:所以说啾啾声只不过是放屁时的意外收获?Don: That is whats intriguing scientists, since the bubbles are released by the fish in response to stress, and occur whether the fish are ascending or descending, they dont think that its simply part of controlling buoyancy.唐:这正是令科学家们振奋的原因。鱼体受到压力作用,就会释放气泡,当浮起或下沉时也会这样,他们不认为这仅仅是为了控制浮力。Some scientists speculate that the sound and bubbles might work as a visual and acoustic screen to confuse predators, but more studies are needed to determine if the chirping bubbles have a behavioral function or not. 一些科学家们推断,鱼类在利用声音和气泡形成有视听效果的屏障,来迷惑捕食者。但是要确定啾啾声和气泡是否具有行为功能还需要进一步的研究。201206/185781瑞金市无痛隆胸手术价格

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赣州激光脱毛多少钱All over the year, over a year ago we decided our television business needed a new business model and by teaming up with TPV of Taiwan, weve moved the television business to a joint venture which gives the TV business a new initial life, that allows Phillips to focus on what we are really good at, and that is as a technology company to innovate, to make the world healthier and more sustainable, we do that as for areas, health care, energy efficient, lighting and consumer health wellbeing, we think that this is really important for the world, there will be a lot of demand for these programs, and at the same time, we are improving our operation excellence through our accelerated program, and in the third quarter result, thats what you see coming through, an increasing top line and an improving bottom line, thanks to Phillips accelerating.一年前,我们认为公司的电视业务需要一种新的业务模式,一年来,我们与台湾TPV公司合作。现在我们将电视生产业务发展成为一个联合投资公司,给予其新的生命力;同时,公司集中力量于真正擅长的领域即作为一家能够不断进行创新的技术公司,为全世界更健康、持续发展贡献自己的力量。我们的领域包括医疗、高效能源、照明及顾客的健康和福利事业。我们认为这些领域对全世界来说都是至关重要的,对这些项目也将会有大量需求。与此同时,通过加速开发这些项目,我们持续提高公司卓越的运营能力。由于飞利浦公司的加速发展,可以看到第三财季业绩的顶线有所增长,账本底线有所改善。Well, while asked about the future, the Phillips chief was a bit more cautious.当我们问到公司未来的前景时,飞利浦的首席执行官还保有一些谨慎。We talked about economic headwinds of Phillips, and we see 3 parts of the world slowing down, China with a lower GDP, Europe of course in a recessional period, and the ed States where especially in the second half of this year, we see more uncertainty creeping, undoubtedly related to related to the elections and the threat of the fiscal cliff and the uncertainty around the responsible care act (Obama Care), we see some orders being pushed out in the ed States even though the third quarter will still very good in growth. The feasibility looking ahead is much lower.我们谈论了飞利浦发展的不利因素,全世界有三大市场的经济发展都在放慢速度,中国的GDP也较往年更低,欧洲正处于经济衰退期,而美国特别是在下半年,潜伏着更多不确定因素,确切地说,是和选举有关的因素、财政悬崖的威胁以及责任医保法案的不确定因素(奥巴马法案)。尽管第三季度保持良好的增长势头,来自美国的定单却在减少。展望未来,不容太过乐观。201211/208998 SnakeVision蛇的视力Snakes have heat-vision that allows them to catch their dinners in the dark. True or false?蛇靠着它们的“热视力”能力来在夜晚捕捉猎物。是对还是错?True! It isn’t quite right to call it “vision,” though–more accurate would be to say that certain species, such as rattlers, have pits just under their eyes that contain specialized heat-sensing organs.当然是正确的!但是把蛇的这种能力说成是“视力”好像不是很准确。更准确地说,应该是某些蛇类,如响尾蛇,在它们眼睛的下面部位有专门的呈凹陷状的热感应器官——颊窝。This ability to spot heat comes in handy in the desert, especially if you’re out looking for a quick-moving mouse to make into a snack and there isn’t enough light to see by. Rattlers are amazingly good at catching prey because of their heat-seeking ability.在沙漠当中,蛇的这一能力可谓是方便之极。特别是当蛇在周围光线不足的情况下,想要抓只小老鼠当点心的时候,更能体现其方便之处。响尾蛇是响当当的捕猎好手,当然,这基本上是得益于它的热感应能力。New studies have actually shown that the same sense organs are used for seeking cold as well. This is just as important when you live in a desert; overheating is always a possibility. Two researchers at Indiana State University in Terre Haute found this out by covering some rattlers’ facial pits with little plastic balls temporarily glued in place.新的研究表明,颊窝还可以用来做冷感应器。生活在沙漠中,找出较凉爽的地方也是很重要的;毕竟,在沙漠中过热现象是家常便饭。两名印第安纳州立大学的研究人员在Terre Haute得出了这一结论。他们暂时用胶水把塑料小球固定在一些响尾蛇的颊窝上,以此将它们的颊窝堵住。With these organsblocked, the rattlers were no better at finding the cool spot in a maze than if they had been moving around by chance. They were “cool-blind.” Take the balls out and the rattlers quickly found their way to the cooler spot. Their thermal vision, so to speak, had been restored.在颊窝被堵住的情况下,响尾蛇便无法从一个迷宫中找出“温度较低的地方”,相比,它只会在四处乱转。此时此刻的它们是“冷盲”。取出小塑料球,响尾蛇便能迅速地找出较冷的地方。也可以说是,他们的热视力已经恢复了。Now researchers debate this, but it’s possible that the ability to find a cool spot in a desert actually came first, in terms of evolutionary history. Get that, and the ability to snag a hot mouse might come as a tasty bonus.目前,科学家们正就此展开讨论。但是,从演化历史来看,凭借这一能力在沙漠中找到一个较凉爽的地方确实是至关重要的。满足这一点之后,再靠热感应能力去抓一只活生生的老鼠也算是美味的奖励啦。 /201212/215250瑞金市妇幼保健人民医院口腔科赣州埋线双眼皮

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