Dr Cui hopes in the future only a 9-volt power source will be needed.

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"If I go to Wal-Mart I'll want to go for the day, " said Cui Hongyan.

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"The value of China's currency is determined by the market fundamentals, not by any politicians, " Cui replied.

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Cui Ruzhuo, who painted "Eternal Lotus Wind" but didn't profit from the offering, says the art market still has legs.

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"The bacteria concentration after filtration depends on the initial concentration of bacteria in water, " said developer Dr Cui of Stanford University.

CNN: Nanotech and 'tea bag' to clean up drinking water

Although a commercial version is some way off, Dr Cui believes there could be a mass-market version of his technology available.

CNN: Nanotech and 'tea bag' to clean up drinking water

Its approach is based on using silicon nanowires created by engineer Yi Cui at Stanford University four or five years ago.

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"The GASC has decided to appoint Wei Di as the new director of China's Soccer Administrative Center, " its vice-minister Cui Dalin told reporters, according to Xinhua.

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Also at the meeting were China's new finance minister Lou Jiwei, U.S. Ambassador Gary Locke, an assistant Chinese foreign minister Cui Tiankai, and other officials of both governments.

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Mr Cui, China's top G-20 negotiator, also firmly rejected a proposal from U.S. Treasury Secretary Timothy Geithner to negotiate targets to narrow current-account gaps and ease global trade imbalances.

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"It would be appropriate for someone to step forward and give us an explanation, otherwise international confidence in the recovery and growth of the global economy might be hurt, " Mr. Cui said.

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Of the north-east's GDP, two-thirds was being produced by state-owned firms, many of which were loss-making, says Cui Wantian of Liaoning University (he thinks they now contribute less than 50%, compared with about 30% nationally).

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There is also the point: cui bono?

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Cui, 58, is China's point-person on America.

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Cui dismisses such concerns.

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