Also

* Dow Chemical Co. replaced Chief Executive Michael D. Parker with Chairman William S. Stavropoulos after two years of what it called “disappointing” earnings.

* Hughes Electronics Corp., owner of the DirecTV satellite TV service, said it would close a money-losing high-speed Internet unit, eliminating 400 jobs.

* Imports from South Korean chip makers threaten to hurt Micron Technology Inc., the U.S. International Trade Commission said in a ruling that may lead to import tariffs. The case now goes to the Commerce Department.