MINYANVILLE ORIGINAL On the last day of the quarter US equities fell on uncertainty among investors as they await results of Spanish banks' stress tests.   "We had been seeing good data recently but now we seem to be following the slowdown in China and Europe and we're seeing weakness " Paul Nolte managing director at Dearborn Partners in Chicago told Reuters.   The Dow Jones Industrial Average (INDEXDJX:.DJI) was down 0.52% to 13 415.62 points as of 12:05 p.m. EDT.   Only four of the 30 Dow components registered gains in intraday trading. Cisco Systems (NASDAQ:CSCO) bucked the ...