Neste trabalho foi estudada a influência dos parâmetros operacionais de eletrodeposição na estrutura, na morfologia dos revestimentos de Cr e Ni-Cr-P e no comportamento eletroquímico destes em meio aquoso contendo cloreto. Todos os eletrodepósitos foram obtidos sobre cobre. As camadas de Cr foram obtidas a partir de um banho industrial. Os eletrodepósitos amorfos de Ni-Cr-P foram obtidos a 60 °...

Introduction: Among the magmatic iron meteorites, group IVB irons have some unusual characteristics, such as high bulk Ni (15-18 wt%), high refractory elements (e.g., Ir), low volatile elements (e.g., Ga, Ge) [1, 2], fast cooling rates and a small parent body [3, 4]. IVB irons do not have a Widmanstatten pattern as in lower Ni IIIAB or IVA irons. Instead, IVB irons have a plessite structure wit...

Primary bovine muscle cell culture studies were conducted to determine whether implanting heifers had a direct effect on in vitro protein synthesis and degradation and to determine the effect of implanting heifers on longissimus muscle palatability. Feedlot heifers (n = 96) were administered one of six implant regimens to characterize their effect on in vitro amino acid uptake and protein degra...

The presence of Psidium guajava in polluted environments has been reported in recent studies, suggesting that this species has a high tolerance to the metal stress. The present study aims at a physiological characterization of P. guajava response to high nickel (Ni) concentrations in the root-zone. Three hydroponic experiments were carried out to characterize the effects of toxic Ni concentrati...

Bacteria integrate CO2 reduction and acetyl coenzyme-A (CoA) synthesis in the Wood-Ljungdal pathway. The acetyl-CoA synthase (ACS) active site is a [4Fe4S]-[NiNi] complex (A-cluster). The dinickel site structure (with proximal, p, and distal, d, ions) was studied by X-ray absorption spectroscopy in ACS variants comprising all three protein domains or only the C-terminal domain with the A-cluste...

The mol-ecular structure of the title compound, [Ni(C(19)H(21)N(2)P)(2)]I(2)·2CH(3)CN, shows two six-membered N-heterocyclic carbene/phosphane chelate rings that form a nearly square-planar coordination geometry around the Ni(II) atom, which lies 0.190 (1) Å above the C(2)P(2) plane. The sum of the bond angles at the Ni(II) atom is 358.68 (6)°, with C-Ni-P bite angles of 82.89 (5) and 84.08 (6)...

Knockout reactions using light nuclear targets, e.g., Be or C, have proven in the past to be very useful in gaining information on the wave function of the valence nucleons. However, the strong absorption concentrates the reaction probability at the surface. Similar arguments hold for transfer and Coulomb break-up reactions. Nucleon knockout reactions using protons, on the other hand, allow one...

Magnetic FeNi@Ni nanocables were prepared as a superior recyclable catalyst towards the hydrogenation reduction of p-nitrophenol to p-aminophenol through a two-step tunable assembly process in a solvothermal system. The proposed fabrication mechanism was verified through characterization by SEM, TEM, XRD, XPS, and UV-Vis. The as-prepared FeNi@Ni nanocomposites are core-shell-structured nanocabl...

The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over alumina supported nickel catalysts prepared by impregnation reduction method and mechanical mixing method. The catalysts were characterized by XRD and FESEM. The results show that the nickel particle diameter of alumina supported nickel prepared by impregnation reduction method (denoted as Ni/Al2O3) is slightly ...

In the title compound, [Ni(C24H36P3)Cl], the Ni(II) atom adopts a distorted square-planar geometry with the two neutral P atoms of the tridentate ligand trans to one another. Bond lengths and angles of the phosphide P atom feature a pyramidal geometry of the donor atom, which forms a single bond with the Ni(II) atom, retaining a stereochemically active lone pair.