Anodic Dissolution of Nickel across Two Consecutive Electron Transfers

Abstract: Conformational behaviors of 2,5-dimethoxy-2,5-dimethyl-1,4-dithiane (compound 1) and 2,5-dimethyl-2,5-bis (methylthio)-1,4-dithiane (compound 2) investigated by computational methods including B3LYP/6-311+G** and M06-2X/6-311+G** levels of theory and NBO analysis. The stereoelectronic effect of axial, axial (ax, ax) and equatorial, equa-torial (eq, eq) conformations were studied using NBO analysis. Using NBO analysis, the values of the stereoelectronic effects were calculated through the energy of stability associated with the electron transfers of compounds 1 and 2. The results showed that the eq, eq conformations of the studied compounds were more stable than their corresponding ax, ax conformations, and LP2X→σS1-C2 and LP2S→σ*C2-X electron transfers play important roles in the conformational be-havior of the studied compounds. The main purpose of the present work was to study the effects of stereoelectronic inter-actions and steric on the conformational superiority of the di-methoxy (compound 1) and di-thiomethyl compounds (com-pound 2). Thus, the values of resonance stability energy, non-diagonal elements, and orbital populations were investigated. Also, active electrophilic and nucleophilic centers were identified using fronting orbitals analysis obtained by DFT methods. The electrostatic potential maps of the title compounds were investigated at the B3LYP/6-311+G* level of theory. All of the NMR parameters and geometrical properties of both compounds were determined in this study.

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Helarchaeota and co-occurring sulfate-reducing bacteria in subseafloor sediments from the Costa Rica Margin

ISME Communications ◽

10.1038/s43705-021-00027-x ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Rui Zhao ◽

Jennifer F. Biddle

Keyword(s):

Costa Rica ◽

Metabolic Pathways ◽

Phylogenetic Analyses ◽

Sulfate Reducing Bacteria ◽

Sulfate Reducing ◽

Hydrocarbon Emission ◽

Costa Rica Margin ◽

Reducing Bacteria ◽

Electron Transfers ◽

Deep Sediments

AbstractDeep sediments host many archaeal lineages, including the Asgard superphylum which contains lineages predicted to require syntrophic partnerships. Our knowledge about sedimentary archaeal diversity and their metabolic pathways and syntrophic partners is still very limited. We present here new genomes of Helarchaeota and the co-occurring sulfate-reducing bacteria (SRB) recovered from organic-rich sediments off Costa Rica Margin. Phylogenetic analyses revealed three new metagenome-assembled genomes (MAGs) affiliating with Helarchaeota, each of which has three variants of the methyl-CoM reductase-like (MCR-like) complex that may enable them to oxidize short-chain alkanes anaerobically. These Helarchaeota have no multi-heme cytochromes but have Group 3b and Group 3c [NiFe] hydrogenases, and formate dehydrogenase, and therefore have the capacity to transfer the reducing equivalents (in the forms of hydrogen and formate) generated from alkane oxidation to external partners. We also recovered five MAGs of SRB affiliated with the class of Desulfobacteria, two of which showed relative abundances (represented by genome coverages) positively correlated with those of the three Helarchaeota. Genome analysis suggested that these SRB bacteria have the capacity of H2 and formate utilization and could facilitate electron transfers from other organisms by means of these reduced substances. Their co-occurrence and metabolic features suggest that Helarchaeota may metabolize synergistically with some SRB, and together exert an important influence on the carbon cycle by mitigating the hydrocarbon emission from sediments to the overlying ocean.

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The impact of indium metal as a minor bimetal on the anodic dissolution and passivation performance of zinc for alkaline batteries: part I—potentiodynamic, potentiostatic, XRD, SEM, and EDAX studies

Journal of Solid State Electrochemistry ◽

10.1007/s10008-021-04998-8 ◽

2021 ◽

Author(s):

Abd El-Rahman Elsayed ◽

Hoda A. El-Shafy Shilkamy ◽

Mahmoud Elrouby

Keyword(s):

Anodic Dissolution ◽

Alkaline Batteries ◽

Indium Metal ◽

A Minor ◽

The Impact

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Electron transfers in graphitized HZSM-5 zeolite

Physical Chemistry Chemical Physics ◽

10.1039/d0cp06148d ◽

2020 ◽

Author(s):

Alain Moissette ◽

Isabelle Gener-Batonneau ◽

Matthieu Hureau ◽

Ludovic Pinard ◽

Hervé Vezin ◽

...

Keyword(s):

Guest Molecule ◽

Zeolite P ◽

Electron Transfers

In the present work, we report the electron transfers occurring after ionization of the guest molecule of t-stilbene incorporated in graphitized HZSM-5 zeolite and we compare these results with the...

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