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MedPartners Inc. said it completed its acquisition of Costa Mesa-based Talbert Medical Management Holdings Corp. for about $200 million, or $63 a share. The purchase of the physician-practice management company will bolster MedPartners’ presence in Southern California and Phoenix. . . . Dura Pharmaceuticals Inc. plans to spend as much as $300 million over the next year to acquire additional respiratory products in a move to boost earnings, Chief Financial Officer Jim Newman said. An acquisition funded by San Diego-based Dura’s $464 million in available cash could add as much as 50 cents a share to annual earnings, Newman said.