Most often, researchers have used laser sources, filtering down their trillions of output photons in a bid to allow just one to pass.
So the onus on the agriculture business is not to prove it safe as in the pharmaceutical industry, they just have to pass some minimal thresholds then they have the right to get into the marketplace.
The drug particles, measuring 1 to 3 microns across, were just the right size to pass into the lungs without getting stuck in the throat.
And yet, of course, it has come to pass, just as Mr Santer foretold.
Because in this economy, retailers are just dying to pass on the savings.
In fact, we just had to pass it along for the image alone.
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Most passengers will continue to pass through just metal detectors.
If it's something too graphic, then I think you definitely just have to pass, or you know, possibly you do take the photograph but you don't submit it for publication.
But the political class today, typified by Stephen Harper, seems to operate under the delusion that culture is just entertainment, something to pass the time after the day's work is done.
Munster continued to press but they had a let-off in the 36th minute when Benoit Baby failed to hold a pass from Malzieu, just as he appeared set to notch a breakaway try.
Sometimes a good arm is just too good to pass up, cost be damned.
To make another pass, just maneuver the aircraft for another run and the view switches back inside the cockpit.
Or, maybe he's just too contemporary to pass as a 19th century illusionist.
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The Bruins would get no closer, with Crosby providing a fitting ending by getting on his stomach to block a centering pass just before time expired.
Janelle Monae is just too good to pass up.
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Their passes often seemed forced, like the final, fitting symbol of the night's frustrations, one the Knicks offered with 4:30 to go in the game: Lin threw a pass to Anthony, who was just inches away, out of bounds, leading to glum faces and hands on knees.
It was a good twenty miles to Coaltown, not just down the road, but I had to pass it on my way home anyway.
However, the best chance of the latter stages fell to Zenit's Danny, the Portuguese star latching onto Arshavin's pass only to fire over with just Van der Sar to beat.
Unfortunately, that means that there aren't any concrete handset decisions to be shared just yet, but we'll be sure to pass those along as soon as we find out ourselves.
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Mr Netanyahu says that the cabinet, when it eventually meets to ratify the memorandum, will pass a resolution limiting the third redeployment to just 1% of the territory.
House Speaker Nancy Pelosi and Defense Appropriations Committee Chairman John Murtha are making a determined effort to buy the votes needed to pass legislation similar in its essentials to that just rejected by the Senate.
And Texas is just the 16th state to pass such legislation since Florida did so in 2005.
Local authorities usually coordinate the closure of whole sections of highway just to make sure they safely pass.
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On the key social issue of abortion, Mr Bush may have done just enough to win himself a pass.
"Play is not just something people do to pass time, it's a core need for every person and culture, " said Mr Pincus.
Straight from the kick-off, King again caused havoc for the Bulls' defence, delaying his pass just enough to give Atkins time to race to the line.
But remember, you are not married to the Mazda5 forever, just as one day you'll pass on the stroller and those enormous car seats to some other family.
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So I guess the first thing I want to say is, just very quickly, I worked very hard with Senator Murray to pass and fight for small businesses for health care legislation reform, and you guys passed that, and I just have great respect for that.
Of course, manufacturers and service providers just pass these taxes on to consumers in the form of higher prices.
It's a milestone they say they're glad to pass, even though it just marks the start of another year without him.
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