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#1 27-07-2018 09:19:13

zhangwl
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Date d'inscription: 01-08-2015
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"Along the way, as the robot encounters cargo

WASHINGTON Cheap Connor McDavid Shirt , Sept. 14 (Xinhua) -- Scientists have created miniature robots out of DNA that can autonomously "walk" around a surface, pick up certain molecules and drop them off in designated locations, a new study published Thursday in the U.S. journal Science said.


"Just like electromechanical robots are sent off to faraway places, like Mars, we would like to send molecular robots to minuscule places where humans can't go, such as the bloodstream," said LuLu Qian, assistant professor of bioengineering of the California Institute of Technology.


Such technology could one day be used for a wide range of applications Cheap Leon Draisaitl Shirt , including synthesizing therapeutic chemicals in an artificial molecular factory, delivering drugs in bloodstreams or cells, or sorting molecular components in trash for recycling, Qian said.


To create a DNA robot, Qian's team constructed three basic building blocks, including a "leg" with two "feet" for walking, an "arm" and "hand" for picking up cargo, and a segment that can recognize a specific drop-off point and signal to the hand to release its cargo.


Each of these components is made of just a few nucleotides within a single strand of DNA.


In principle Cheap Ryan Nugent-Hopkins Jersey , these modular building blocks could be assembled in many different ways to complete different tasks.


For example, a DNA robot with several hands and arms, could be used to carry multiple molecules simultaneously.


In the work described in the Science paper, the Qian group built a robot that could explore a molecular surface, pick up two different molecules and then distribute them to two distinct regions on the surface.


"The DNA robot moves around on a 58-nanometer-by-58-nanometer pegboard on which the pegs are made of single strands of DNA complementary to the robot's leg and foot," Qian's team said in a statement.


"The robot binds to a peg with its leg and one of its feet -- the other foot floats freely," the team said.


"When random molecular fluctuations cause this free foot to encounter a nearby peg, it pulls the robot to the new peg and its other foot is freed. This process continues with the robot moving in a random direction at each step."


Since one step for the little guy takes five minutes Cheap Oscar Klefbom Jersey , and allows it to move six nanometers, it may take a day for the robot to explore the entire board, the team said.


"Along the way, as the robot encounters cargo molecules tethered to pegs, it grabs them with its 'hand' components and carries them around until it detects the signal of the drop-off point," it said.


"The process is slow, but it allows for a very simple robot design that utilizes very little chemical energy."


In a summary on the robot, the Science magazine called Qian's work "one small step for a DNA robot Cheap Kailer Yamamoto Jersey , one giant leap for mankind.


"The future is here," the summary wrote.


TILBURG, The Netherlands, June 16 (Xinhua) -- A new direct rail link from Chengdu to Tilburg, the sixth largest city and the second largest logistic hotspot in the Netherlands, is being seen as a "golden opportunity."


Chengdu is 10,947 km away in China's southwest Sichuan Province. The latest alternative logistic service is growing in popularity and promises broadened industrial cooperation between the two cities.


The service, launched in June last year Cheap Mark Letestu Jersey , now has three trains westbound and three trains eastbound per week. "We plan to have five trains westbound and five trains eastbound by the end of this year," Roland Verbraak, general manager of the GVT Group of Logistics told Xinhua.


GVT, a 60-year-old family company, is the Dutch partner of CDIRS Chengdu International Railway Services.


Various rail freight services along three main routes with 43 transit hubs on the network are currently in operation or under planning.


For the Chengdu-Tilburg link, trains travel through China, Kazakhstan, Russia Cheap Cam Talbot Jersey , Belarus, Poland and Germany before reaching RailPort Brabant, a terminal located in Tilburg and owned by GVT.


Cargo coming from China is mostly electronics for multinational groups such as Sony, Samsung, Dell and Apple as well as products for European aerospace industry. Some 70 percent of them go to the Netherlands and the rest are delivered by barge or by train to other destinations in Europe, according to GVT.


Cargo going to China includes auto spare parts for big manufacturers in China, new cars and food articles such as wine, cookies Cheap Milan Lucic Jersey , chocolate.


At the end of May, Saudi Basic Industries Corporation (SABIC), a global leader in diversified chemicals headquartered in Riyadh, joined the growing group of eastbound clients. The Saudi company that operates in 50-more countries shipped its first eight containers of resin, produced in Genk (Belgium), as feedstock for its own facilities and its customer's facilities in Shanghai via Tilburg-Chengdu rail freight service.


"Typically we ship via ocean, but currently we are facing constraints on ocean freight capacity from northern Europe to the Far East, so we need alternatives. Shipping via air is of course very fast but also very expensive with a cost per ton similar to the sales price per ton. So SABIC is happy with the New Silk Road Cheap Darnell Nurse Jersey , a good alternative for air transportation," said Stijn Scheffers, Eurpean logistic manager of the Saudi company.


The containers arrived in Shanghai via Chengdu in about 20 days. "Everything went well. The material was in good condition and arrived on time to avoid a production stop," Scheffers told Xinhua. "The Chengdu-Tilburg rail link has proven to be a reliable mode of transport, we will use it more in the future for sure."


He added that other companies headquartered in the Middle East are also interested in the services. "They have multiple production sites in Europe from where a lot is shipped directly to China, they can all make use of this connection."


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