Effect of Nickel and Cobalt on Methanogenic Enrichment Cultures and Role of Biogenic Sulfide in Metal Toxicity Attenuation.

ABSTRACT: Metals play an important role in microbial metabolism by acting as cofactors for many enzymes. Supplementation of biological processes with metals may result in improved performance, but high metal concentrations are often toxic to microorganisms. In this work, methanogenic enrichment cultures growing on H₂/CO₂ or acetate were supplemented with trace concentrations of nickel (Ni) and cobalt (Co), but no significant increase in methane production was observed in most of the tested conditions. However, high concentrations of these metals were detrimental to methanogenic activity of the cultures. Cumulative methane production (after 6 days of incubation) from H₂/CO₂ was 40% lower in the presence of 8 mM of Ni or 30 mM of Co, compared to controls wit

SUBMITTER: Paulo LM 

PROVIDER: S-EPMC5513950 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature