rabblerabblerabble - Slashdot User

Dell Rugged Laptops Not Quite Tough Enough 225

Posted by timothy on Tuesday November 03, 2009 @11:40AM from the one-good-hit dept.

An anonymous reader writes "Trusted Reviews has put the new Dell XFR rugged laptop through the grinder and it hasn't fared as well as expected. Considering that these guys drove a car over a Panasonic Toughbook, they went pretty easy on the Dell, but it still couldn't take the punishment. It looks like Dell still has a way to go to steal the ball from Panasonic when it comes to all terrain computing."

Researchers Use Salmon DNA To Make LED Lightbulbs 66

Posted by Soulskill on Wednesday July 22, 2009 @12:48PM from the bright-ideas-that-smell-fishy dept.

Al writes "Researchers from the University of Connecticut have created a new light-emitting material by doping spun strands of salmon DNA with fluorescent dyes. The material, which is robust because DNA is such a strong polymer, absorbs energy from ultraviolet light and gives off different colors depending on the amounts of dye it contains. A team led by chemistry professor Gregory Sotzing created the new material by mixing salmon DNA with two types of dye, then pumping the solution from a fine needle while a voltage is applied between the needle tip and a grounded copper plate covered with a glass slide. As the liquid jet comes out, it dries and forms long nanofibers that are deposited on the glass slide as a mat. The researchers then spin this nanofiber mat directly on the surface of an ultraviolet LED to make a white-light emitter. The color-tunable DNA material relies on an energy-transfer mechanism between two different fluorescent dyes, and the DNA keeps the dye molecules separated at a distance of 2 to 10 nanometers from each other."

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