United Overseas Bank (UOB), Singapore's second-biggest lender by assets, posted a 5.7 percent fall in its fourth-quarter profit, as turmoil in credit markets led to more write-downs. The bank reported net profit of S$506 million for the October-December period, down from S$537 million a year ago. UOB, which had a smaller exposure to risky debt compared to local industry leader DBS, made fresh provisions...