@article {5882, title = {The sulfur-shift: an activation mechanism for periplasmic nitrate reductase and formate dehydrogenase}, journal = {Inorg Chem}, volume = {52}, year = {2013}, pages = {10766-10772}, author = {Cerqueira, N. and Fernandes, P. and Gonz{\'a}lez, P. and Moura, J. J. G. and Ramos, M. J.} }