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Det er altså ikke lurt å bestille kredittkort for en student som ikke har økonomi til å betale en eventuell kredittkortregning. Flere fordeler med å bruke tjenesten: Mobilselskapene

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Dating med half life

dating med half life

out that the expiration date on a drug does stand for something, but probably not what you think it does. If you could watch a single atom of a radioactive isotope, U-238, for example, you wouldnt be able to predict when that particular atom might decay. The shelf life of many drugs, it wrote, seems to be considerably longer than their expiration dates, leading to unnecessary waste, higher pharmaceutical costs, and possibly reduced access to necessary drugs for some patients. To put the magnitude of that return on investment into everyday terms: Its like spending a dollar to save 677. The rule is that a sample is safe when its radioactivity has dropped below detection limits. Bushra, R and Aslam,. Nothing happened, but we tried, says rheumatologist Roy Altman, now 80, who helped write the AMA report. Pharmacies across the country in major medical centers and in neighborhood strip malls routinely toss out tons of scarce and potentially valuable prescription drugs when they hit their expiration dates.

In 1986, the Air Force, hoping to save on replacement costs, asked the FDA if certain drugs expiration dates could be extended. Thats almost 15,000 in wasted EpiPens alone. As long as an beste hekte apps for iphone organism is alive, the amount of C-14 in its cellular structure remains constant. The primary carbon-containing compound in the atmosphere is carbon dioxide, and a very small amount of carbon dioxide contains C-14. Theres simply no way to tell. To determine a new drugs shelf life, its maker zaps it with intense heat and soaks it with moisture to see how it degrades under stress. Refining our prescription drug dating process could save billions, he says.

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