Optimisation of biogas yields from anaerobic digestion by feedstock type - The Biogas: Science, Production and Applications - page 143

enzymes tend to be very reactive at neutral pH, have a low
redox potential, and may help metabolise fatty acids. It
forms part of the amino acid selenocysteine, known as the
21st genetically encoded amino acid
Molybdenum Mo is a co-factor of various flavinous enzymes; involved
in nitrogen fixation in methanosarcina

FDH Oleszkiewicz and

Sharma,1990
Schattauer et al., 2011
Scherer, 1988
Somitsch, 2007.

Tungsten Tungsten is a component of the formate dehydrogenase

(FDH) enzyme. It is possible that tungsten may aid the
metabolism of CO 2 and H 2 , in a manner similar to nickel

FDH Kayhanian and Rich, 1995

Zinc and
copper

Zinc and copper are present in relatively large
concentrations in many methanogens. They can stimulate
cell growth and are co-factors of RNA- and
DNApolymerase. Not yet proven to be stimulatory to
methane production

It may be part of FDH, super
dimutase (SODM) and
hydrogenase

Burgess , 1999

Kayhanian and Rich, 1995
Kirby

et al.

., 1981
Oleszkiewicz and Sharma,
1990
Schattauer

et al

et al. , 2011.

Magnesium
and
manganese

Not yet proven to be stimulatory to methane production Mn stabilises
methyltransferase in
methanogens and is often
interchangeable with Mg in
kinase reactions

Burgess et al ., 1999

Schattauer et al. , 2011