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Wall Street turns positive, materials up



    NEW YORK (Reuters) - Stocks turned positive before midday on Tuesday, with materials shares leading the way higher.

    The Dow Jones industrial average was up 51.16 points, or 0.40 percent, at 12,778.37. The Standard & Poor's 500 Index was up 4.38 points, or 0.32 percent, at 1,358.02. The Nasdaq Composite Index was up 4.85 points, or 0.17 percent, at 2,901.79.

    (Reporting By Caroline Valetkevitch; Editing by Kenneth Barry)