The yen rebounded from a seven-week low against the dollar on Tuesday as investors trimmed positions in a holiday-thinned market.    The European Central Bank is determined to stop increases in oil and food prices becoming entrenched in a broader inflation rise, President Jean-Claude Trichet said in a newspaper interview published on Monday.    The ECB is taking the liquidity crisis more seriously than the Fed, but if central banks keep pumping money in the problem will clear up next year, Michael Browne from Sofaer Global Research said.