The Nikkei stock index on Thursday fell to finish at around a one-month low after briefly sinking over 2 percent on concerns over the adverse impacts of the recent upward trend in long-term interest rates in Japan. The 225-issue Nikkei Stock Average ended down 502.74 points, or 1.30 percent, from Wednesday at 38,054.13, its lowest level since April 26. The broader Topix index finished 15.42 points, or 0.56 percent, lower at 2,726.20. On the top-tier Prime Market, decliners were led by mining, marine transportation and nonferrous metal issues. The yield on the benchmark 10-year Japanese governm…