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時間:2022-08-24 來源:本站 點擊:258次
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Omicron 'sub******

Scientists are keeping a close watch on a recently-discovered sub-variant of the Omicron version of the COVID-19 virus to determine how its emergence could effect future pandemic spread.。

The initial Omicron variant has become the dominant virus strain in recent months but British health authorities have notably identified hundreds of cases of the latest version, dubbed BA.2, while international data suggest it could spread relatively quickly.。

The UK Health Security Agency (UKHSA) identified more than 400 cases in Britain in the first ten days of this month and has indicated the latest variant has been detected in some 40 other countries, accounting for a majority of most recent cases in some nations including India, Denmark and Sweden.。

The UKHSA indicated on Friday it had designated the BA.2 sub-lineage as a variant under investigation (VUI) as cases of it were on the increase even if, in Britain, the BA.1 lineage currently remains dominant.。

The authority underlined that "there is still uncertainty around the significance of the changes to the viral genome," which required surveillance as, in parallel, cases in recent days showed a sharp rise in BA.2 incidence notably in India and Denmark.。

"What surprised us is the rapidity with which this sub-variant, which has been circulating to a great extent in Asia, has taken hold in Denmark," French epidemiologist Antoine Flahault told AFP.。

Scientists must evaluate how the virus, which has engendered the worst global health crisis in a century, continues to evolve and mutate. Its latest incarnation does not possess the specific mutation used to track and compare BA.1 against Delta, the previously dominant strain.。

BA.2 has yet to be designated a variant of concern – but Flahault says countries have to be alert to the latest development as scientists ramp up surveillance.。

"(France) expected a spike in contaminations in mid-January: It didn't happen and perhaps that is due to this sub-variant, which seems very transmissible but not more virulent" than BA.1, he observed.。

"What interests us is if this (sub-variant) possesses different characteristics" from BA.1 in terms of contagiousness and severity, France's public health agency said Friday.。

To date, only a handful of BA.2 cases have emerged in France – but the country is monitoring developments as they spread across the Channel.。

'Comparable severity'

Flahault, director of the University of Geneva's Institute of Global Health, says the watchword is not panic but "vigilance" as "for now we have the impression (BA.2 case) severity is comparable to" classic variant Omicron cases.。

"But there are numerous questions on the table" and a need to monitor properties of the new variant on the block.。

"Very early observations from India and Denmark suggest there is no dramatic difference in severity compared to BA.1," tweeted Tom Peacock, a virologist at Imperial College, London, adding the latest variant should not call into question the effectiveness of existing vaccines.。

Peacock stressed that "we do not currently have a strong handle on ... how much more transmissibility BA.2 might have over BA.1. However, we can make some guesses/early observations."

He added that "there is likely to be minimal differences in vaccine effectiveness against BA.1 and BA.2. Personally, I'm not sure BA.2 is going to have a substantial impact on the current Omicron wave of the pandemic.。

"Several countries are near, or even past the peak of BA.1 waves. I would be very surprised if BA.2 caused a second wave at this point. Even with slightly higher transmissibility this absolutely is not a Delta-Omicron change and instead is likely to be slower and more subtle," he forecast.。

French Health Minister Olivier Veran said on Thursday that BA.2 did not look as if it would prove a game-changer as variants appear on the scene "fairly regularly". But he indicated he would reserve judgment.。

"What we know for now is that (BA.2) more or less corresponds to the characteristics that we know of Omicron" mark one.。

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》。

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你的双11快递到了吗?新闻记者探班邮政快递土门递送部:快递小哥一天派送9趟******  \

你的双11快递到了吗?11月11日早上9时左右,华商报新闻记者探班西安邮政土门投递部,但见这儿快递沉积的责重如山,工作员已经快速的快递分拣运输。据了解,西安邮政当日快递量做到72千件,比往年同期增加了20多万件,而且仍在不断提升。

  从早晨6点逐渐,土门投递部的快递员杨志峰早已运行了3个多钟头了,每一个快递员眼前全是一个个“小山坡”,必须第一时间快递分拣配送。“这一大堆便是我早晨要送的,快递量很大,持续加车加次数,近期每日都工作中十几个钟头,单日投送量2000多份,平时就400到600件。”杨志峰说,自身10日当日就跑了9趟住宅小区,大伙儿日夜奋战,连用餐全是简易夹个馍将就下,只为了更好地将快递尽早送至群众手上。

  \

我国邮政局数据监测表明,11月1日全国各地共收揽快递包囊5.69亿件,同比增加28.54%。电商企业的提早营销活动,将近些年的“双十一”高峰時间变长,最高值也不限于“双十一”当日发生。

  因肺炎疫情危害,许多快递企业在网上购物端口号受到限制关掉,很多快递从邮政方式开展收寄,应对迅速提高的快递量,西安邮政是怎样解决的?

  \

“2021年高峰来的比历年更早,11月1日具有11日,西安邮政已投送550余万件快递。”土门业务经理王建喜告知新闻记者,西安邮政采取一定的有效措施了3项对策解决今天的“双11”高峰期。一是提早对揽投场所开展了升級更新改造,增加1000余平方米的生产制造场所,资金投入了自动化技术分拣设备,还根据很多人力资源,物力资源資源的资金投入,确保快递以更快速率送到顾客手上。二是灵便调节了投递对策,大白天集中化投送购物广场,企业客户,夜里提升小夜班投递,关键投送住房客户。三是对于投递量更高的揽投点,上级领导企业机构50多的人的党员突击队,深入一线协助投递,确保保证各种电子邮件快放快出,“进去去,投得到,不库存积压,不延误。”。

  \

此外,并沒有由于电子邮件量的猛增而减少疫情防控规定。但凡接受进去的电子邮件所有开展消毒解决,投递员快递分拣装货完后,开展再度消毒。投递员全体人员疫苗接种,投递全过程全过程佩戴口罩,采用无触碰投送。依照疫情防控规定,许多住宅小区没法进到,菜鸟快递和快递柜早早已放满,投递难度系数特别大,邮政快递员也号召收到快递员电話的人们可以第一时间前去领到,都还没接到快递的客户耐心等待,邮政小伙已经马不停蹄赶到为您投递的道路上。”。

  华商报新闻记者 李琳。

Sales of China's iconic sedan brand rev up in Jan******

CHANGCHUN, Dec. 4 (Xinhua) -- Hongqi, an automobile brand under China's leading automaker FAW Group Co. Ltd., posted a rise of 46.7 percent in sales in the first 11 months of this year.。

A total of 261,400 Hongqi-branded vehicles were sold during the period, said FAW Group.。

Meanwhile, Hongqi has sped up the development of new energy vehicles. A factory focusing on electric cars with an investment of 8 billion yuan (about 1.3 billion U.S. dollars) has started production.。

Hongqi, meaning "red flag," is China's iconic sedan brand. Established in 1958, the brand has been used in parades for national celebrations.。

Founded in 1953 in the northeastern city of Changchun, the capital of Jilin Province, FAW Group is considered the birthplace of China's auto industry. Enditem。

陆军炮兵防空兵学院精准扶贫记事:注重“输血”更注重“造血”

1.抢先看!2022中国网络文明大会将有这些安排

2.西藏拉萨昨日新增本土“10+187”

3.《小围裙计划之寻味长沙》第四集:长沙人的“英雄菜”

4.又爆雷?客服失联、门店关停……家长和老师都懵了,监管出手

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