Former government chief scientific adviser, Sir David King, said the summit had come one year too early for Mr Obama to be able to take leadership of the issue.

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"While we evaluate restructuring initiatives and strategic alternatives, we are committed to continuing to provide high-quality solar products to our global customer base, " Suntech CEO David King said in a statement.

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"It was extremely uplifting for them, " said Dr. David King, a trauma surgeon at the hospital.

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Parts of Silwan, on the eastern slopes below the Old City, are already precariously propped up on iron stilts, to facilitate the excavation of King David's biblical city, which is said to lie beneath.

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"Personally, I think that having some threshold would give some more uniformity to the test, but pragmatically we don't want to limit the sensitivity of tests, " said Prof David Cowan from King's College London, who is in charge of anti-doping at next summer's London Olympic Games.

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Professor David Cowan, head of the King's College unit, said it will only be a matter of hours before the samples leave the athlete and arrive in the hands of the scientists.

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"When the Wessex changed to the Sea King we did a lot of training, much of it at night with night vision goggles, " David said.

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