Also

* Dean Foods Co. of Dallas agreed to sell its Marie’s salad dressings and dips units to Ventura Foods of Brea. Terms were not disclosed.

* Macrovision Corp. of Santa Clara, Calif., agreed to acquire Trymedia Systems Inc. of San Francisco for $34 million.

* Northrop Grumman Corp. has named James Pitts corporate vice president and president of the company’s electronic systems business, replacing Robert Iorizzo, who will retire.