The stain in question enters dead cells easily, but cannot enter living ones.
Moreover, using a stain in this way meant they could automate the process by attaching a camera to the microscope, taking photographs of all 384 wells, and feeding the images into a computer that had been programmed to measure the area of orange in a well and contrast that with the total area occupied by worms.
Kidman's two films are Dogville, directed by Lars von Trier, and The Human Stain, in which she stars alongside Anthony Hopkins.
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It featured a new stain worth saving in the form of professional football great Joe Montana.
But above all, I'm reminded of the extent to which the stain of apartheid endures in the lives of South Africans, despite two decades of democracy.
Never store your clothes over long periods in plastic dry-cleaning bags which emit gases that can stain or yellow fabrics as well as break down the elasticity in stretch garments.
Some of the earliest applications of nanomaterials have been in products such as stain-resistant fabrics, self-cleaning windows and harder-wearing tennis balls, but more and more are turning up in cosmetics and skin lotions such as sun-blockers.
Attempts to carry out scientific tests on the semen stain on Mrs Gregson's clothing in 1977, 1988 and 1995 had proved unsuccessful.
Bringing back the ghosts of Chernobyl and Three Mile Island, investors have decided to shun nuclear energy on fears that the current accident could put a stain on what appeared to be a booming trend in clean energy.
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Whatever happens in early 2010, that dire record will stain its reputation.
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The deceitful stain and negative stigma that will follow Mr. Bush in the aftermath of this scandal will significantly reduce his endorsement value.
In late February, a physician appeared on the Washington, DC Fox affiliate to inform consumers of a Yale University study claiming exposure to PFCs (important and ubiquitous stain and water-resistant compounds) leads to osteoarthritis in women.
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Its versatile go-anywhere shape is wrapped in a specially developed acoustic skin that is both water and stain resistant so you can enjoy your music anywhere you go.
Due next year:a line of stain-resistant food containers that eliminate the reddish tinge caused by the acids in tomato sauce.
The only stain on Burgess's performance was a high tackle on Fuifui Moimoi that resulted in him being placed on report.
Due next year: the first line of stain-resistant food containers, which eliminate that evil reddish tinge caused by the acids in tomato sauce.
New features will include a low annoyance horn accompanied by blinking lights, leg and footroom to accomodate four adults, a flat floor, stain-resistant and environmentally friendly upholstery, interior air filters, and dual climate controls in the rear.
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And Brazilians will be embarrassed to reflect that the shocking conditions in Carandiru's Pavilion Five, and in thousands of prisons and police lockups across the country, are a nasty stain on the country's otherwise strengthening democratic credentials.
Those new features include advanced stain-fighting power, of course, but they also deliver energy savings and a reduction in the use of potentially toxic chemicals.
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He said domestic abuse was "abhorrent and a stain on Scotland", saying there were over 51, 900 incidents of domestic abuse recorded by police in 2009 - 10.
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