Banks are buoyant after strong second quarter results from Swiss sector giant UBS.UBS swung to a forecast-beating second-quarter net profit. Net profit came to 2bn Swiss francs from a loss of 1.4bn francs last time. That was well above expectations for a 1.26bn francs profit. Revenue jumped 59% to 9.19bn and was also well ahead of consensus forecasts."This was a good result in volatile market conditions," the bank said.Here, Barclays, Lloyds and RBS are the top risers in the sector.Pure Circle is dragging the food sector lower. Shares in the sweetener maker slumped 19% after it warned full year profitability will be below levels seen in 2009.Top performing sectors so far todayBanks 5,140.14 +4.19%Life Insurance 3,680.17 +2.68%Chemicals 5,694.12 +2.28%Industrial Transportation 2,341.10 +1.41%Alternative Energy 4,796.76 +1.26%Bottom performing sectors so far todayFood Producers & Processors 5,005.80 -1.60%Tobacco 26,094.39 -1.54%Personal Goods 15,982.72 -1.26%Technology Hardware & Equipment 536.80 -1.26%Travel & Leisure 4,569.68 -1.26%