BUZZ-Oil and gas companies: Oil prices fall
** Shares (Berlin: DI6.BE - news) of oil and gas companies down as oil prices fall after Greece rejects debt bailout terms and China rolls out emergency measures to support its stock markets, adding to concerns about demand at a time of global oversupply
** Benchmark Brent crude oil down 2.6 pct a barrel at $58.77 at 10:00 a.m ET; U.S. light crude down 2.6 pct at $54.32
** Chevron Corp down 1.2 pct at $94.68; ConocoPhillips (NYSE: COP - news) down 2 pct at $59.31
** Rex Energy Corp (Other OTC: RXNRP - news) down 7.7 pct at $4.62; Comstock Resources Inc down 9.3 pct at $2.22; Oasis Petroleum Inc (NYSE: OAS - news) down 7.9 pct at $13.46; Energy XXI Ltd (NasdaqGS: EXXI - news) down 6.9 pct at $2.15; Seventy Seven Energy Inc (NYSE: SSE - news) down 11.3 pct at $3.45