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時間:2022-08-15 來源:本站 點擊:258次
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重庆市1例确诊病人29日曾在西安乘坐G1709次高铁动车******

  重庆卫生健康委官方网站信息:2021年10月31日,重庆荣昌区汇报1例海外键入性新冠肺炎确诊病例。肖某,男,10月14日搭乘HY501次飞机航班自塞尔维亚从西安入关,入关后即在本地集中化防护。

  10月29日解除隔离后,从西安搭乘G1709次高铁动车(座号:15车07F)于当天19时左右回到荣昌家居防护。10月30日晚,抗体检测初筛呈阳性,即闭环控制装运至定点医院开展核查和临床查验。

  10月31日,经市,区二级专家会诊,确诊为海外键入性新冠肺炎确诊病例(通用型)。现阶段该确诊病例已经定点医院接纳医治,有关疫防对策已经贯彻落实中。



来源于:华商网-华商报。

编写:王蜀周秦。

北京冬奥会今日开幕!两分钟带你了解冬奥会冷知识******

  今天(2022年2月4日)

  北京冬奥会正式拉开序幕

  你知道

  冬奥会有哪些项目吗?

       中国军团在冬奥会的成绩又如何?

  这些关于冬奥会项目的冷知识

  你又了解多少?

  一起快来学习吧!

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西安市雁塔区好几条路段现阶段行驶一切正常 一部分街口围挡已撤******

  今日(18日)夜间,有最新消息称因防治必须,西安市雁塔区大规模地区将封控管理方法。截至晚10时20分,华商报记者当场走访调查,西安东仪路与南三环交叉路口行驶一切正常,华商报记者驾驶由南三环辅道由东向西行车,经过电子器件南大街、子午大道、超白北路交叉路口,路面行驶现阶段均为一切正常,当场未开展封控。另据群众体现,记者确认,今夜早些时候时已被施工围挡的好几个街口,在晚10时上下已被撤除。请众多西安市群众再次遵循疫情防控要求,降低多余交通出行。

  (华商报记者 荣枚)。


双语热点:世上首个活体机器人 如今可自我繁殖******

数十亿年来,生物体为了延续生命,已经进化出多种繁衍方式。近日,美国佛蒙特大学和塔夫茨大学的研究团队发现了一种全新的生物繁殖方式,并利用这一发现创造了有史以来第一个可自我繁殖的活体机器人——Xenobots 3.0,未来或可为外伤、先天缺陷、癌症、衰老等提供更直接、更个性化的药物治疗。

World's first living robots can now reproduce, scientists say

The US scientists who created the first living robots say the life forms, known as xenobots, can now reproduce -- and in a way not seen in plants and animals.

创造第一个活体机器人的美国科学家说,这种被称为“爪蟾机器人”(xenobots)的生命体,现已可以繁殖——以一种与植物和动物都不同的方式。

Formed from the stem cells of the African clawed frog (Xenopus laevis) from which it takes its name, xenobots are less than a millimeter (0.04 inches) wide. The tiny blobs were first unveiled in 2020 after experiments showed that they could move, work together in groups and self-heal.

“爪蟾机器人”由非洲爪蟾(Xenopus laevis)的干细胞组成,它的名字由此而来,其宽度不到一毫米。在实验表明它们可以移动、集体合作和自我修复后,这些微团型机器人于2020年首次亮相。

Now the scientists that developed them at the University of Vermont, Tufts University and Harvard University's Wyss Institute for Biologically Inspired Engineering said they have discovered an entirely new form of biological reproduction different from any animal or plant known to science.

现在,创造这些“爪蟾机器人”的佛蒙特大学、塔夫茨大学和哈佛大学怀斯生物启发工程研究所的科学家表示,他们发现了一种全新的生物繁殖形式,不同于科学上已知的任何动物或植物。

"I was astounded by it," said Michael Levin, a professor of biology and director of the Allen Discovery Center at Tufts University who was co-lead author of the new research.

共同主导这项新研究的科学家,塔夫茨大学生物学教授兼艾伦探索中心主任迈克尔·莱文(Michael Levin)说:“我对此感到震惊。”

"Frogs have a way of reproducing that they normally use but when you ... liberate (the cells) from the rest of the embryo and you give them a chance to figure out how to be in a new environment, not only do they figure out a new way to move, but they also figure out apparently a new way to reproduce."

“青蛙有一种它们通常使用的繁殖方式,但是当你……从胚胎的其余部分释放(细胞),你给它们一个机会去弄清楚如何在一个新环境中生存,它们不仅会找到一种新的移动方式,而且它们显然也发展出了一种新的繁殖方式。”

Robot or organism?

是机器人还是生物?

Stem cells are unspecialized cells that have the ability to develop into different cell types. To make the xenobots, the researchers scraped living stem cells from frog embryos and left them to incubate. There's no manipulation of genes involved.

干细胞是具有发育成不同细胞类型的能力的非特化细胞。为了制造“爪蟾机器人”,研究人员从青蛙胚胎中提取了活干细胞,并让它们孵化。过程中不涉及基因操纵。

"Most people think of robots as made of metals and ceramics but it's not so much what a robot is made from but what it does, which is act on its own on behalf of people," said Josh Bongard, a computer science professor and robotics expert at the University of Vermont and lead author of the study, "In that way it's a robot but it's also clearly an organism made from genetically unmodified frog cell."

“大多数人会认为机器人是由金属和陶瓷制成的,但与其讨论机器人是由什么制成的,不如讨论它的作用是什么,它代表人类的自主行动。”佛蒙特大学电脑科学教授和机器人专家,也是该研究主要作者的乔西·邦加德(Josh Bongard)说:“从这个意义上说,它是一个机器人,但它显然也是一个由未经基因改造的青蛙细胞制成的有机体。”

Bongard said they found that the xenobots, which were initially sphere-shaped and made from around 3,000 cells, could replicate. But it happened rarely and only in specific circumstances. The xenobots used "kinetic replication" -- a process that is known to occur at the molecular level but has never been observed before at the scale of whole cells or organisms, Bongard said.

邦加德说,他们发现,最初是球形、由大约3000个细胞组成的“爪蟾机器人”,可以自我复制。但这很罕见,而且只在特定情况下发生。他说,“爪蟾机器人”使用了“动力学复制”——这一过程已知发生在分子水平,但以前从未在整个细胞或生物体的规模上观察到过。

With the help of artificial intelligence, the researchers then tested billions of body shapes to make the xenobots more effective at this type of replication. The supercomputer came up with a C-shape that resembled Pac-Man, the 1980s video game. They found it was able to find tiny stem cells in a petri dish, gather hundreds of them inside its mouth, and a few days later the bundle of cells became new xenobots.

在人工智能的帮助下,研究人员随后测试了数十亿种体型,以使“爪蟾机器人”在这种类型的复制中更有效。这台超级电脑最终设计出了一个类似于80年代电子游戏中吃豆人(Pac-Man)的C形状。他们发现,它能够在培养皿中找到微小的干细胞,将数百个干细胞聚集到它的嘴里,几天后,这束细胞变成了新的“爪蟾机器人”。

"The AI didn't program these machines in the way we usually think about writing code. It shaped and sculpted and came up with this Pac-Man shape," Bongard said.

"人工智能并没有按照我们通常认为的编写代码方式,对这些机器进行编程。它塑造和雕刻并发展了这种吃豆人形状。"

"The shape is, in essence, the program. The shape influences how the xenobots behave to amplify this incredibly surprising process."

邦加德说:“从本质上来说,形状就是程序。形状会影响‘爪蟾机器人’的行为,以放大这一令人难以置信、令人惊讶的过程。”

The xenobots are very early technology -- think of a 1940s computer -- and don't yet have any practical applications. However, this combination of molecular biology and artificial intelligence could potentially be used in a host of tasks in the body and the environment, according to the researchers. This may include things like collecting microplastics in the oceans, inspecting root systems and regenerative medicine.

“爪蟾机器人”仍处于非常早期的技术——就像40年代的电脑——还没有任何实际应用。然而,研究人员表示,这种分子生物学和人工智能的结合,有可能用于身体和环境中的许多任务。这可能包括收集海洋中的微塑料、检查根系和再生医学等。

While the prospect of self-replicating biotechnology could spark concern, the researchers said that the living machines were entirely contained in a lab and easily extinguished, as they are biodegradable and regulated by ethics experts.

虽然自我复制生物技术的前景可能会引起人们的担忧,但研究人员表示,这些活体机器人完全控制在实验室中,很容易销毁,因为它们是可生物降解的,并受到伦理专家的监管。

"There are many things that are possible if we take advantage of this kind of plasticity and ability of cells to solve problems," Bongard said. The study was published in the peer-reviewed scientific journal PNAS on Monday.

邦加德说:“如果我们利用细胞的这种可塑性和解决问题的能力,有很多事情会变得可能。”该研究于周一发表在受同行评审的科学期刊《美国国家科学院院刊》。

无良商家贩卖容貌焦虑,医美营销乱象多

1.一个中国原则是国际社会的普遍共识

2.烟台机场新开烟台-仁川货班 恢复烟台-米兰货运

3.希腊新增4309例新冠确诊病例 克里特岛一游客感染

4.专家:美英澳核潜艇合作公然违反《不扩散核武器条约》

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