Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:3.4.23.17 (
PCE
)
1,301
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Reduction rate constants of the chlorinated ethylenes cis-
1,2-dichloroethylene
(cis-DCE), trichloroethylene (TCE), and tetrachloroethylene (
PCE
) reacted with flavin mononucleotide hydroquinone (FMNH2) under anoxic conditions were investigated. FMNH2 was produced in methanol solvent by the photoreduction of FMN. In aqueous solution, FMN was not fully reduced to FMNH2 but instead yielded the semiquinone radical FMNH*. However, when FMN was anchored to nanocrystalline TiO2, band gap irradiation resulted in electron transfer from the TiO2 conduction band to FMN, thus yielding FMNH2. The FMNH2 generated in aqueous solution on the TiO2 surface was a stronger reductant toward chlorinated ethylenes, relative to FMNH2 in solution. Furthermore, by combining the reactivity of the TiO2 conduction band electrons [TiO2(e-(CB)] with FMNH2, reduction rate constants for the chlorinated ethylenes increased by 2 orders of magnitude relative to FMNH2 alone. The results show how biological molecules such as FMNH2 could have significant effects toward the remediation of organic pollutants.
...
PMID:Controlling the reactivity of chlorinated ethylenes with flavin mononucleotide hydroquinone. 1935 Sep 40
Trichloroethylene (TCE) and tetrachloroethylene (
PCE
) are common ground water contaminants susceptible to reductive dechlorination by FeS (mackinawite) in anaerobic environments. The objective of this study was to characterize the mineral-associated products that form when mackinawite reacts with TCE and
PCE
. The dissolved products of the reaction included Cl
-
and Fe
2+
, and trace amounts of cis
1,2-dichloroethylene
(for TCE) and TCE (for
PCE
). Selected area electron diffraction (SAED) analysis identified greigite as a mackinawite oxidation product formed after reaction between TCE or
PCE
and FeS over seven weeks. Release of Fe
2+
is consistent with the solid state transformation of mackinawite to greigite, resulting in depletion of the solid with Fe. X-ray photoelectron spectroscopy of the sulfur 2p peak showed a shift to a higher binding energy after FeS reacted with TCE or
PCE
, also observed in other studies of mackinawite oxidation to greigite. The results may help efforts to maintain the reactivity of FeS generated to remediate chlorinated aliphatic contaminants in ground water.
...
PMID:Transformation of mackinawite to greigite by trichloroethylene and tetrachloroethylene. 2771 91
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