The researchers found that even slight shifts in the length of the day posed problems.

Demographic shifts over the last decade pose new problems for the Republicans.

This shift may pose problems for the overall market.

Mr. Field added, however, that the shift to casual wear posed complications.

The sudden shifts of gravity posed problems, but none of the equipment was particularly fragile.

Such a shift could pose big problems in places where water is already a strained resource, they say.

The population growth and shifts are posing headaches in all of those states.

This shift in Soviet doctrine poses a challenge to United States leaders.

President Bush's shift poses a serious problem for the two agencies.

Such a shift in power poses a special threat to the nation's predominantly for-profit health organizations, which are owned by stockholders.