Tokyo stocks opened higher Thursday following overnight advances in the U.S. Dow Jones index, although gains were capped by falls in some export-oriented issues after the Japanese yen strengthened slightly against the U.S. dollar. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average rose 151.53 points, or 0.56 percent, from Wednesday to 27,369.38. The broader Topix index was up 6.15 points, or 0.32 percent, at 1,921.30. On the top-tier Prime Market, gainers were led by pulp and paper, metal product and precision instrument issues. At 9 a.m., the dollar fetched 127.99-128.00 y…