The Sensex has rebounded into the positive zone and is now up 27 points at 15,834.The NSE Nifty is up 17 points at 4,795.Infosys and TCS have surged around 4.5% each to Rs 1,485 and Rs 949, respectively. Satyam and Wipro have rallied nearly 3% each to Rs 445 and Rs 418, respectively.Ranbaxy has soared nearly 3% to Rs 456. DLF has gained nearly 2% at Rs 609, and Hindustan Unilever has added over 1.5% to Rs 239.Jaiprakash Associates is up over 1% at Rs 216.HDFC and HDFC Bank have slipped around 2.5% each to Rs 2,320 and Rs 1,295, respectively.Hindalco has shed 1.3% at Rs 174. ACC, Ambuja Cements and Grasim are down over 1% each at Rs 803, Rs 116 and Rs 2,525, respectively.