BUZZ-Dubai's Islamic Arab Insurance plunges to worst day in 4-months as merger talk dashed

May 7 (Reuters) - ** Islamic Arab Insurance SALAMA.DU fell 6.8 pct to 0.56 dirhams; Stock top loser on the Dubai index .DFMGI ** Co said it is not engaged in a merger process and will not be merging with other entities. There was market speculation on...