Fig 4.

NH₄⁺ effect on temperature-activity curve of HaG. Enzyme activity was measured at various temperatures in the absence or presence of 10 mM NH₄⁺. The activities at 30°C and 40°C in the presence and absence, respectively, of NH₄⁺ were regarded as 100%. The averages on at least two measurements are shown. Solid and open circles, HaG activity measured in the presence of 0 and 10 mM NH₄⁺, respectively.