Growth of the wild-type, A141, and A142 strains of N. europaea. (a) OD600 during a 215-h growth comparison experiment (see text). Symbols: □, N. europaea (wild type) showing a growth rate of 0.089 h−1; ◊, N. europaea A141 showing a growth rate of 0.062 h−1; ○, N. europaea A142 showing a growth rate of 0.087 h−1. (b) NO2− accumulation of the growth experiment depicted in panel a.