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The fluorescent biosensor Frex, recently introduced as a sensitive tool to quantify the NADH concentration in living cells, was characterized by time-integrated and time-resolved fluorescence spectroscopy regarding its applicability for in vivo measurements. Based on the purified sensor protein, it is shown that the NADH dependence of Frex fluorescence can be described by a Hill function with a concentration...
A large number of industrially relevant enzymes depend upon nicotinamide cofactors, which are too expensive to be added in stoichiometric amounts. Existing NAD(P)H‐recycling systems suffer from low activity, or the generation of side products. H2‐driven cofactor regeneration has the advantage of 100% atom efficiency and the use of H2 as a cheap reducing agent, in a world where sustainable energy carriers...
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