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- W4221001106 abstract "The direct effect of CO2 on denitrification has attracted great attention currently. Our previous studies have confirmed that CO2 inhibited heterotrophic denitrification and caused high nitrite accumulation and nitrous oxide emission. Cysteine is a widely reported bio-accelerator; however, its effect on denitrification under CO2 exposure remains unknown. In this paper, the effect of cysteine on heterotrophic denitrification and its mechanisms under CO2 exposure were explored with the model denitrifier, Paracoccus denitrificans. We observed that total nitrogen removal increased from 17.9% to 90.4% as cysteine concentration increased from 0 to 50 μM, probably due to restoration of cell growth and viability. Further study showed that cysteine reduced the inhibition of CO2 on denitrification due to multiple positive influences: (1) regulating glutathione metabolism to eliminate intracellular reactive nitrogen species (RNS), while reducing extracellular polymeric substances (EPS) levels and altering its composition, ultimately restoring cell membrane integrity (2) facilitating the transport and metabolism of carbon sources to increase NADH production, and (3) increasing intracellular iron and up-regulating the expression of key iron transporters genes (AfuA, AfuB, ExbB and TonB) to restore the transport and consumption of electron. This study suggests that cysteine can be added to recover heterotrophic denitrification performance after inhibition by elevated CO2." @default.
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- W4221001106 date "2022-06-01" @default.
- W4221001106 modified "2023-09-29" @default.
- W4221001106 title "Cysteine reduced the inhibition of CO2 on heterotrophic denitrification: Restoring redox balance, facilitating iron acquisition and carbon metabolism" @default.
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- W4221001106 doi "https://doi.org/10.1016/j.scitotenv.2022.154173" @default.
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