Principal investigator Joe Veverka from Cornell University said the alterations were driven by the process material loss as the comet orbited the Sun.

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He said multiple mechanisms existed to prevent the theft or loss of nuclear material.

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But he adds that it could take a few quarters for the share loss to become material.

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Among the most worrying reports of looting has been the loss of radioactive material at Iraq's main nuclear site.

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The company said it does not currently expect the loss to be material.

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While they are likely to be renewed, the loss of any one would have a material negative impact on revenues.

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Rising material and labor costs are some of the reasons for the loss, though a lot of it seems inexplicable.

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Section 409 of their eponymous act, which is supposed to protect investors by making corporate disclosures more accurate and reliable, requires that reporting companies promptly disclose any material changes (say, the resignation of a top manager or the loss of an important customer) that might hamper their ability to deliver products or pay their bills.

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Members of the group taking monthly classes were mailed the same material as those who attended classes weekly, and those who failed to meet weight-loss goals could get individual counseling by phone or in person.

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