Despite extensive studies on [NiFe]-hydrogenases, the mechanism by which these enzymes produce and activate H2 so efficiently remains unclear. A well-known EPR-active state produced under H2 and known as Ni-C is assigned as a Ni(III)-Fe(II) species with a hydrido ligand in the bridging position between the two metals. It has long been known that low-temperature photolysis of Ni-C yields distinc...

Global temperatures have increased 0.6 °C over the past century; however regional temperatures have shown greater fluctuations. Since local environmental conditions vary along latitudinal clines, latitude has become an essential component in projecting plant response to warming. Three ecotypes of Arabidopsis were selected from varying latitudes in order to investigate heat stress within an ecot...

The title complex, [Ni(2)(C(42)H(46)Cl(2)N(6)O(2))(C(2)H(3)O(2))]ClO(4)·2CH(3)CN, was synthesized by condensation of 2,6-diformyl-4-chloro-phenol with N,N-bis-(amino-prop-yl)benzyl-amine in the presence of Ni(II) ions. The ligand is a 28-membered macrocycle with two identical pendant arms. The coordination geometries of the Ni atoms are both octa-hedral. The two Ni atoms are bridged by two phen...

The mononuclear Ni(II) amide, [Ni(C(12)H(21)N(2)Si)(2)], has the Ni(II) atom N,N'-chelated by the N-silylated anilinide ligands. The ligands are arranged cis to each other and obey the C(2)-symmetry operation. The two ends of the N-Si-N chelating unit exhibit different affinities for the metal atom: the Ni-N(anilinide) bond length is 1.913 (3) Å and Ni-N(amine) is 2.187 (3) Å. The four-coordina...

In order to simulate solid-oxide fuel cell (SOFC)-related coking mechanisms of Ni, methane-induced surface carbide and carbon growth was studied under close-to-real conditions by synchrotron-based near-ambient-pressure (NAP) X-ray photoelectron spectroscopy (XPS) in the temperature region between 250 and 600 °C. Two complementary polycrystalline Ni samples were used, namely, Ni foam-serving as ...

When observed in singles, complex fragments associated with the 182-MeV ' La+ Ni reaction present a complex invariant-cross-section pattern without an obvious source, while the center-of-mass velocities of the coincident binary events span the entire range from complete fusion to near projectile velocities. By gating on a given value of the source velocity, it is possible to characterize precis...

In this work, Phosphotungstic Acid modified Carbon Paste Electrode (PWA-CPE) is used as a substrate for electro-polymerization of o-Anisidine (OA). Also, Triton X-100 (TX-100) surfactant is used as an additive for electrochemical polymerization of OA onto the PWA-CPE, which is investigated as a novel matrix for dispersion of nickel species. The prepared electrodes are characterized by...

synthesized using the conventional solid-state reaction method at 1350–1550°C in air in order to investigate the effect of dopants on sintering, crystal structure, chemical stability under CO2 and H2S, and electrical transport properties. The formation of the single-phase perovskite-type structure with an orthorhombic space group Imam was confirmed by Rietveld refinement using powder X-ray diff...