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Among a wider class of pantothenamides that have broad spectrum activity against many bacteria, only one particular molecule is much more effective against E. coli, the study found.

American and United required the use of face masks for passengers and crew last month and said the new rule would be enforced for at least the next 60 days.

Amid solid efforts to bolster the economy, the country's major steelmakers saw their sales revenue grow 5.44 percent year-on-year to stand at 3.39 trillion yuan (4 billion) in the first nine months.

Among the approximate 7,000 items seized by the FBI were some 2,000 human bones from about 500 human beings. Nearly all of those human remains, Carpenter said, were dug up from ancient Native American burial sites.

Amid the uncertain global economic situations, Hong Kong flight movements and passenger volume experienced steady growth, benefiting from growth in visitor traffic to Hong Kong, said the AA.