US AT OPEN

RESULTS
Burger King beats by $0.02, misses on revs
Big Lots beats by $0.01, revs in-line; guides FY11 EPS in-line
Medtronic EPS in-line, misses on revs; lowers FY11 guidance

NEWS
3Par reports that DELL is preparing to raise its bid
Potash reports that Rio Tinto may team with Chinese partner to bid
BofA CEO purchase of 30K shares at $13.02, worth about $391K
stem cells stem cell stocks may see further pressure after yesterday's ruling to temporarily blocks government rules expanding stem cell research (GERN, STEM, NBS, ASTM, OSIR, CYTX, SGMO, ATHX)

AFTER HOURS
Pfizer's Sutent cancer treatment failed to improve survival in
lung cancer trials against Roche's Tarceva