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Shares of American Superconductor Corporation (NASDAQ: AMSC) dropped 44% this week after the company announced Tuesday that Sinovel Wind Group Company Limited, AMSC’s largest customer which accounts for about three-quarters of its annual revenue, would not accept shipments until it reduced its inventory levels and refused to make payments for some shipments made in this fiscal year. 

Here are two very different advanced biofuel strategies: Green Plains Renewable Energy, Inc. (NASDAQ: GPRE) is producing algae from byproducts at one of its commercial ethanol plants to make biodiesel, and Codexis, Inc. (NASDAQ: CDXS) is developing biocatalysts to produce advanced biofuel and pharmaceuticals and to remove carbon from smokestacks.

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