Figuring out the best iPad for you can be a little tricky. Apple now sells three different 11-inch tablets and two 13-inch models, each with key differences in pricing, specs and accessory support.

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Commonly used HPLC acetonitrile solvent has been through a worldwide shortage with a cost increase in 2008 and 2009. In order to get around this situation, a method by RP-HPLC employing methanol and ...