The oil & gas sector is going well, with BP among the risers after yesterday announcing it has recovered the blow-out preventer from the floor of the Gulf of Mexico.Also higher is oil and gas explorer Chariot, which has wheeled out an increase to its resource estimate for its Namibian assets.The pharmaceuticals sector is a little off colour, with GlaxoSmithKline among the fallers. The drug giant is facing a call to withdraw its diabetes drug Avandia in Britain because of heart risk concerns. Top performing sectors so far todayFixed Line Telecommunications 1,956.46 +1.99%Chemicals 5,794.15 +1.60%Technology Hardware & Equipment 555.90 +1.09%Oil & Gas Producers 7,114.19 +0.82%Real Estate Investment & Services 1,449.46 +0.77%Bottom performing sectors so far todayHealth Care Equipment & Services 3,085.31 -1.13%Alternative Energy 3,901.32 -0.93%Industrial Metals & Mining 6,326.27 -0.48%Pharmaceuticals & Biotechnology 9,248.76 -0.39%Oil Equipment, Services & Distribution 20,365.56 -0.31%