Mol Fm
1.It was found that the concentration of Zn2+ at about 1. 0mol/L was essential to keep optimal growth of Anabaena azotica Ley and also important to keep a quite high value of photosynthetic oxygen evolution rate, chlorophyll fluorescence (Fv/Fm) level and carbonic anhydrase activity, whereas the relative high concentration of Zn2+(>5. 0um) would inhibit the growth of A.
