1.12.7.2 2,2'-bipyridyl 66% activity at 1 mM 1706 1.12.7.2 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone inhibition of H2 production, photosystem 1 is involved in the supply of electrons to the hydrogenase 16755 1.12.7.2 CO strong inhibition 176 1.12.7.2 CO - 176 1.12.7.2 CO both activities are inhibited 176 1.12.7.2 CO hydrogenase I is readily inhibited, hydrogenase II is irreversibly inactivated 176 1.12.7.2 CO at 0.5 atm 98% inhibition 176 1.12.7.2 CO reversible competitive inhibitor versus hydrogen 176 1.12.7.2 CO inhibition can be reversed by light 176 1.12.7.2 CO exhibits reversible sensitivity to CO inhibition 176