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Showing 1 to 20 of 87 for “"Hydrogenase"”.
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Ultrafast dynamics of [NiFe] hydrogenase models
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Hydrides in [FeFe]-hydrogenase model complexes
The student, Michaela Carlson, submitted this Dissertation for approval on 2018-04-17 at 10:07.
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Hydrogenase of Clostridium acetobutylicum ATCC 824
… acidogenic and solventogenic phases. The enzyme hydrogenase plays an important role in this bacterium because it converts excess reducing power into hydrogen gas to maintain a balance in the oxidation-reduction state in the cell. During solventogenesis, additional reducing power is used in the …
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Investigation of Escherichia coli [NiFe]-Hydrogenase Maturation
[NiFe]-hydrogenases catalyze the reversible oxidation of hydrogen gas at a bimetallic active site and are important enzymes in bacteria and archaea for anaerobic growth and pathogenesis. The maturation of [NiFe]-hydrogenase requires at least seven dedicated accessory proteins to assemble and insert …
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Synthesis, spectroscopy, and electrochemistry of hydrogenase mimics
Hydrogenases (H2ases) provide microorganisms with hydrogen to be used as fuel for processes such a methanogenesis. The reversible hydrogen evolution reaction (HER) is catalyzed by anaerobic bacteria to expel hydrogen as a byproduct of photosynthesis. Hydrogen does not accumulate in our atmosphere …
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Hydrogenase and Thiosulfate Reductase From Desulfovibrio Vulgaris
Made available in DSpace on 2014-12-09T22:04:19Z (GMT). No. of bitstreams: 1 6915316.pdf: 3269181 bytes, checksum: b920d3815a77bc82f7b7e97e54f1ee61 (MD5) Previous issue date: 1969
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Spectroscopic and functional models for Hmd hydrogenase
The hydrogenases are metalloenzymes that catalyze transformations of dihydrogen. Two hydrogenase classes, [FeFe] and [NiFe] catalyze the interconversion of dihydrogen to protons and electrons. In order to facilitate electron transfer, these enzymes contain iron-sulfur clusters. Synthetic models for …
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Modeling The Active Site Of [NiFe]-Hydrogenase
The hydrogenases are metalloenzymes that act to catalytically interconvert dihydrogen with protons and electrons. Although there are three classes of hydrogenases that are known, the focus of this research will be on the first hydrogenase to be evolved, the [NiFe]-hydrogenase, which contains a …
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Hydrogenase utilization and regulation in species of methanosarcina
… of H2 require the activity of three different hydrogenase enzymes, however, M. barkeri can also utilize an electron transport system that is independent of hydrogenase activity. In Chapter 2, the interconnected nature of H2-dependent and H2-independent metabolic pathways was investigated in a …
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Production of a soluble hydrogenase from R. Eutropha H16
Hydrogenases are metalloenzymes that reversibly catalyse the oxidation or production of molecular hydrogen (H2) and are generally classified by the structure of the catalytic site. From a biotechnology perspective, hydrogenases have been extensively studied with a view to their potential …
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Toward Hydrogenase mimicry : subjecting the problem to three different approaches
In this work, the challenging task of modelling Hydrogenase is subjected to three different approaches. The first strategy used here is bioorganometallic. A wide range of sulfur containing ferrocene-peptide derivatives were synthesized and fully characterized. As a second approach, organic …
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Structural and Functional Models of the Iron -Only Hydrogenase Enzymes
New structural models for the H2-oxidizing state of the H-cluster were synthesized. Electron-rich polyisocyano compounds Fe2(S 2CnH2n)(CO)2(CNMe)4 undergo oxidatively induced reaction with additional CNMe to give [Fe2(S2CnH 2n)(CNMe)7](PF6)2, the first members of a new class of iron thiolates. …
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Hydrogenase Models and Studies Based on Iron Carbonyl Chelate Complexes
New routes to Fe2(SR)2(CO)4L2 complexes have been elucidated, starting from the CO-free iron sources of FeCl2 or iron powder. Such routes utilize oxidative carbonylation, reductive carbonylation, or comproportionation. The routes readily allow isotopic-labeling of model complexes with 57Fe for …
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Structural and Spectroscopic Models of the [iron-Iron]-Hydrogenase Enzyme
The unsaturated character of [1(CO)3(PMe 3)]+ is indicated by its reactivity with CO, which occurs in seconds. The product; [Fe2(S2C2H 4)(mu-CO)(CO)3(PMe3)(dppv)]+ [1(CO)4(PMe3)]+ is highly unstable and could only be observed under a CO atmosphere. The EPR spectrum for [1(CO)4(PMe3)]+ featured a …
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Small molecule mimics of hydrogenase enzymes: synthesis, protonation, and electrocatalysis
In nature, H2 is processed by enzymes called hydrogenases, which catalyze the reduction of protons to dihydrogen, as well as the reverse reaction. The active sites of the two most prevalent hydrogenases contain NiFe or FeFe cores, bound to thiolates, cyanide, and carbon monoxide ligands. These …
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Synthesis of redox-active ligands and their use in hydrogenase modeling
… goal. Nature uses the enzymatic system of hydrogenases (H2ases) to reversibly convert protons and electrons into H2. The two primary H2ases are the [FeFe] and [NiFe]-H2ases, aptly named for the metals present at the active sites. Both H2ases possess numerous unique features, including FeS …
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Incorporation of cyanide ligands into models of [FeFe]- and [NiFe]-hydrogenase
… in Nature by a class of metalloenzymes called hydrogenases. Hydrogenase enzymes catalyze the reduction of protons into H2 or oxidized H2 into protons. The catalytic rates and overpotentials of hydrogenase enzymes are comparable to Pt catalysts. The most prevalent hydrogenase enzymes are …
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Biohydrogen as a Fuel: Understanding and Engineering Hydrogenase Enzymes for Biotechnological Applications
… for microbial H2 evolution are called hydrogenases. The model organism Escherichia coli produces H2 during mixed acid fermentation by the action of it native hydrogenases. However, the natural level of H2 produced is too low to meet current industrial demand for H2 or any future uses as …
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