A few months <a href=" http://www.simocorp.com/simo-history#servant ">is himcolin effective</a> Tuesday's decline put the S&P 500 on track to break aneight-day string of gains. Nine of the 10 S&P 500 industrysector indexes fell, with energy and material shares rankingamong the day's worst performers. Marathon Petroleum dropped 4.1 percent to $70.13. Alcoa slid 1 percent to$8.09.