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Robbins & Myers

(RBN)

was one of Tuesday's small-cap winners as the Dayton, Ohio-based diversified machinery company reported a rise in fourth-quarter earnings. Looking ahead, the company said it expects 2007 earnings to range from $1.70 to $1.90 a share. For the first quarter, the company is looking for earnings of 40 cents to 50 cents a share. Shares were trading up $4.25, or 13.4%, to $35.99.

Pemstar

( PMTR) surged on news that the Rochester, Minn.-based company agreed to be acquired by

Benchmark Electronics

(BHE) - Get Benchmark Electronics, Inc. Report

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for $211 million in stock. Shares of Pemstar were climbing 68 cents, or 18.6%, to $4.33. Benchmark was slipping 96 cents, or 3.3%, to $27.97.

Rita Medical Systems

( RITA) gained after the Fremont, Calif., company said its Habib 4X Laparoscopic resection device received marketing clearance from the Food and Drug Administration. Shares were trading up 15 cents, or 4.4%, to $3.60.

Neurochem

( NRMX) slumped after the Canadian biopharmaceutical company was downgraded by Piper Jaffrey to underperform from market-perform. Shares were down $2.11, or 11.6%, to $16.02.

SunOpta

(STKL) - Get SunOpta Inc. Report

stumbled after the Canadian natural and organic food company said it's taking a third-quarter charge of $2.1 million for a number of items, including the write-down of inventory from the 2005 crop to its net realizable value. Shares were falling 85 cents, or 7.5%, to $10.51.