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SAN FRANCISCO， Jan. 11 (Xinhua) -- Bioengineers at Stanford University in west coast of the United States have created an ultra-low-cost， hand-powered blood centrifuge with rotational speeds of up to 125，000 revolutions per minute (rpm).

The device， capable of separating blood plasma from red cells in 1.5 minutes， applies the same mechanical principles in a whirligig， which is built by threading a loop of twine through two holes in a button， grabbing the loop ends， then rhythmically pulling. As the twine coils and uncoils， the button spins at a dizzying speed.

In the case of "paperfuge，" which is built from paper worth 20 U.S. cents， the spin can exert centrifugal forces of 30，000 Gs.

"To the best of my knowledge， it's the fastest spinning object driven by human power，" said Manu Prakash， an assistant professor of bioengineering at Stanford University and senior author of a paper published in the Jan. 10 issue of Nature Biomedical Engineering.

"There are more than a billion people around the world who have no infrastructure， no roads， no electricity. I realized that if we wanted to solve a critical problem like malaria diagnosis， we needed to design a human-powered centrifuge that costs less than a cup of coffee."

A centrifuge is critical for detecting diseases such as malaria， African sleeping sickness， human immunodeficiency virus (HIV) and tuberculosis.

Inspired by spinning toys， Prakash began brainstorming design ideas with Saad Bhamla， a postdoctoral research fellow in his lab and first author on the paper. After weeks of exploring ways to convert human energy into spinning forces， they began focusing on toys invented before the industrial age as yo-yos， tops and whirligigs.

"One night I was playing with a button and string， and out of curiosity， I set up a high-speed camera to see how fast a button whirligig would spin. I couldn't believe my eyes，" said Bhamla， when he discovered that the whirring button was rotating at 10，000 to 15，000 rpms.

After two weeks of prototyping， he mounted a capillary of blood on a paper-disc whirligig and was able to centrifuge blood into layers.

With further improvements， the low-cost version is expected to enable precise diagnosis and treatment in the poor， off-the-grid regions where these diseases are prevalent.

"From a technical spec point of view， we can match centrifuges that cost from 1，000 to 5，000 U.S. dollars，" Prakash was quoted as saying in a news release from Stanford.

LONDON Cheap Nike Air Max 97 OG Undefeated Black UK , March 15 (Xinhua) -- Following are the English Premier League standings after Sunday's early match (tabulated under games played, won, drawn, lost Cheap Nike Air Max 97 OG Undefeated Olive Green UK , goals for, goals against, points):

Chelsea 28 19 7 2 58 23 64

Manchester City 29 17 7 5 59 28 58

Arsenal 29 17 6 6 56 30 57

Manchester Utd 28 15 8 5 47 26 53

Liverpool 28 15 6 7 42 30 51

Southampton 29 15 5 9 40 21 50

Tottenham 28 15 5 8 46 39 50

Stoke 29 12 6 11 33 35 42

Swansea 28 11 7 10 33 37 40

West Ham 29 10 9 10 39 37 39

Newcastle 28 9 8 11 32 43 35

Crystal Palace 29 8 9 12 34 40 33

West Brom 29 8 9 12 27 36 33

Everton 28 6 10 12 33 41 28

Hull 29 6 10 13 26 37 28

Aston Villa 29 7 7 15 19 38 28

Sunderland 29 4 14 11 23 43 26

Burnley 29 5 10 14 26 47 25

QPR 29 6 4 19 30 52 22

Leicester 28 4 7 17 24 44 19

HO CHI MINH CITY, Feb. 11 (Xinhua) -- Vietnam will issue international driving licenses with information in English Cheap Nike Air Max 97 OG Undefeated White UK , French, Russian, Spanish and Vietnamese, specifying the type of vehicle that the holder is allowed to use Cheap Men's Nike Air Max 97 Ultra Black White UK , local media reported Wednesday.

This type of driving license will be issued in accordance with international standards in the form of a passport, and will be valid in 85 countries and territories which participated in the 1968 International Convention on Road Traffic and the Convention on the Road Signs (Vienna Convention), the VietnamNet Bridge daily quoted an official from the Vietnam Road Administration (VRA) as saying.

VRA has submitted a Circular guiding the issuance of international driving licenses to the Ministry of Transport for approval, which is expected to take effect in the first quarter of this year Cheap Men's Nike Air Max 97 Ultra Triple Black UK , said Nguyen Van Huyen, VRA's Director General.

According to VRA, the international driving license, which will be granted to Vietnamese citizens Cheap Men's Nike Air Max 97 Gold Yellow Black UK , valid from one to three years, can be used in most European countries and five Southeast Asian countries including Vietnam, Myanmar, the Philippines Cheap Men's Nike Air Max 97 Silver Grey Red UK , Thailand and Indonesia.

Initially, the licence will be issued in capital Hanoi and southern Ho Chi Minh City only, with the issuance fee of 135,000 VND (roughly 6 U.S. dollars).

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