Nanotechnology company Lumera Corp. of Bothwell, Wash., announced yesterday the resignation of Thomas D. Mino, its CEO for the past six years, who will become a Lumera consultant. While a committee searches for a permanent replacement, the company's board selected Joseph J. Vallner, a board member since June 2006, to serve as president and interim CEO. Vallner, a biotech and technology company executive, was recently appointed CEO of Lumera's new bioscience subsidiary, Plexera, a position he will continue to hold while heading Lumera.