MARQUETTE – In conjunction with the Biology Seminar Series at Northern Michigan University, a discussion titled “From Microbes to Microarrays: The Doctor’s New Assistant and His Mathematical Toolbox” will be presented at 4 p.m. Friday, April 8, in the Mead Auditorium in West Science. The public is invited to attend free of charge. Sujay Datta, a math professor at NMU, will be the key presenter. The event is sponsored by the biology and mathematics departments. For more information, call 227-2020.