A version of this article appears in print on September 6, 2015, Section A, Page 1 of the New York Edition of the New York Times with the headline, "Emails reveal academic ties in a food war.", Examines lobbying activities of firms and interest groups in the debate over bioengineered foods - and involving third-party scientists "and their supposedly unbiased research." Includes examples of interactions and financial support for university scientists by commercial firms.