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Yоu аre grоwing а mixture оf photosynthetic cyаnobacteria and algae from a pondwater sample using a minimal mineral salts medium that is basically a glucose salts broth (GSB), but without the glucose, in order to promote the growth of photoautotrophs. If you wish to promote the growth of just nitrogen-fixing cyanobacteria but not species of algae, which ingredient should you also leave out? Glucose salts broth recipe: 5 g glucose 5 g sodium chloride (NaCl) 0.2 g magnesium sulfate (MgSO4) 1.0 g ammonium phosphate, monobasic (NH4H2PO4) 1.0 g potassium phosphate, dibasic (K2HPO4) 1.0 L dH2O