There have been plenty of company updates for investors to ponder today but Petropavlovsk is today's standout stock as higher gold price lifts the miner of the precious metal.The first benefits of the acquisition of rival support services company VT Group helped Babcock put in a strong performance in its latest first half, giving the shares a boost today.Yellow Pages publisher Yell has slumped after it posted a decline in half year profit but it still believes it can meet expectations for the full year adjusted EBITDA.In a separate statement Yell also announced Michael Pocock will become chief executive officer 1 January 2011.FTSE 250 - RisersPetropavlovsk (POG) 1,024.00p +8.02%Centamin Egypt Ltd. (CEY) 197.90p +6.97%Ashtead Group (AHT) 134.60p +6.07%Rathbone Brothers (RAT) 1,021.00p +4.93%TalkTalk Telecom Group (TALK) 139.80p +4.88%Afren (AFR) 129.20p +4.45%Babcock International Group (BAB) 595.50p +4.20%JKX Oil & Gas (JKX) 313.70p +4.15%Gartmore Group Ltd. (GRT) 111.00p +3.74%Hochschild Mining (HOC) 565.50p +3.67%FTSE 250 - FallersYell Group (YELL) 12.37p -20.50%Rentokil Initial (RTO) 91.25p -3.39%Punch Taverns (PUB) 66.00p -3.30%Computacenter (CCC) 369.80p -2.68%RPS Group (RPS) 230.10p -2.50%Telecity Group (TCY) 452.30p -2.48%Dunelm Group (DNLM) 492.70p -2.44%Stagecoach Group (SGC) 216.60p -2.43%Enterprise Inns (ETI) 114.50p -2.14%WH Smith (SMWH) 466.40p -2.10%