The bombing demonstrated that American forces remain the most powerful arbiter in the regional power struggles that plague Afghanistan.

The genome sequence serves as a powerful arbiter of the quality of EST evidence, and will enable consolidation of additional exons into transcriptional units.

This intruder - one whom they called The Shadow - had been the first to show a strange ability in eluding the powerful arbiter.

Conversely, within the Hicksite movement the rejection of the market economy and the continuing focus on community and family bonds tended to encourage women to retain their role as powerful arbiters.

But the effect of such a sentiment, enunciated by two such powerful social arbiters, I underestimated.

It was a key New York social institution, its owner one of the most powerful arbiters of the era's overlapping contests for status.

Still, it is discouraging to see the army remain such a powerful arbiter.

"Coral reefs are powerful arbiters of life both in the sea and on the land," she writes.

So, without powerful arbiters, it's way harder for powerful media companies to modify the marketing conversation.

Nevertheless, in the past few years the couture has steadily re-emerged as a powerful arbiter of style, no longer content to merely purr along with luxurious clothes for women of financial substance.