English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In anaerobic or aerobic conditions in the presence of 5 mM sodium cyanide, an inhibitor of iron oxidase, cupric ion (Cu2+ ) was reduced enzymatically with elemental sulfur (S0 ) by washed intact cells ofThiobacillus ferrooxidans AP19-3 to give cuprous ion (Cu+ ). The rate of Cu2+ reduction was proportional to the concentrations of S0 and Cu2+ added to the reaction mixture. The pH optimum for the cupric ion-reducing system was 5.0, and the activity was completely destroyed by 10-min incubation of cells at 70°C. The activity of Cu2+ reduction with S0 by this strain was strongly inhibited by inhibitors of hydrogen sulfide: ferric ion oxidoreductase (SFORase), such as α,α′-dipyridyl, 4,5-dihydroxy-m -benzene disulfonic acid disodium salts, and diazine dicarboxylic acid bis-(N, N -dimethylamide). A SFORase purified from this strain, which catalyzes oxidation of both hydrogen sulfide and S0 with Fe3+ or Mo6+ as an electron acceptor in the presence of glutathione, catalyzed a reduction of Cu2+ by S0 , and the Michaelis constant of SFORase for Cu2+ was 7.2 mM, indicating that a SFORase catalyzes the reduction of not only Fe3+ and Mo6+ but also Cu2+ .

Reduction of Cupric Ions with Elemental Sulfur by Thiobacillus ferrooxidans