PubMed Journals Articles About "Comparison Nickel Sulfate Nickel Sulfate Detecting Nickel Contact" RSS

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Showing "Comparison Nickel Sulfate Nickel Sulfate Detecting Nickel Contact" PubMed Articles 1–25 of 6,200+

Comparison of Nickel Sulfate 2.5% and Nickel Sulfate 5% for Detecting Nickel Contact Allergy.

Nickel is among the most common contact allergens found on patch testing worldwide and, because of its ubiquitous nature in our environment, often has important implications for allergen avoidance strategies. In both North America and Europe, nickel positivity is found in approximately 20% of patients who undergo patch testing. Whereas in North America, nickel sulfate is typically tested at a concentration of 2.5%, in Europe, it is tested at a 5% concentration.

Nickel release from metal tools in the German hairdressing trade - a current analysis.

Nickel is one of the most common contact allergens. Despite EU regulations concerning maximum permissible release of nickel from metal objects, nickel release at inappropriately high levels from metal objects was detected in various studies.

XANES/EPR Evidence the Oxidation of Nickel(II) Quinolinylpropi-oamide and Its Application of Csp3-H Functionalization.

An in-situ generated oxidation species of nickel quino-linylpropioamide intermediate was produced. Characterization by XANES and EPR provides complementary insights into this oxidized nickel species. With aliphatic amides and isocyanides as substrates, a nickel-catalyzed facile synthesis of structurally diverse five-membered lactams could be achieved.

Influence of chelate ring type on chelate-chelate and chelate-aryl stacking: the case of nickel bis(dithiolene).

Chelate-aryl and chelate-chelate stacking interactions of nickel bis(dithiolene) were studied at the CCSD(T)/CBS and DFT levels. The strongest chelate-aryl stacking interaction between nickel bis(dithiolene) and benzene has a CCSD(T)/CBS stacking energy of -5.60 kcal mol-1. The strongest chelate-chelate stacking interactions between two nickel bis(dithiolenes) has a CCSD(T)/CBS stacking energy of -10.34 kcal mol-1. The most stable chelate-aryl stacking has the benzene center above the nickel atom, while the...

Epidemiology of Nickel Sensitivity: Retrospective Cross-Sectional Analysis of North American Contact Dermatitis Group (NACDG) Data 1994-2014.

Nickel is a common allergen.

Diverse catalytic reactivity of a dearomatized PNP*-nickel hydride pincer complex towards CO reduction.

A dearomatized PN3P*-nickel hydride complex has been prepared using an oxidative addition process. The first nickel-catalyzed hydrosilylation of CO2 to methanol has been achieved, with unprecedented turnover numbers. Selective methylation and formylation of amines with CO2 were demonstrated by such a PN3P*-nickel hydride complex, highlighting its versatile functions in CO2 reduction.

Simultaneous photocatalytic reduction/degradation of divalent nickel/naphthalene pollutants in aqueous solutions.

Toxic heavy metals and organic pollutants simultaneously exist in the wastewater of some industries. This study explores reduction of toxic divalent nickel ions, from either nitrate or sulfate salts, coupled with naphthalene (NA) degradation using titania photocatalyst in an efficient photo-sono reactor. A synergism appears when reduction and degradation treatments occur simultaneously in the media. With initial concentrations of [Ni(II)] = 5 mg/L and [NA] = 10 mg/L, under dominant mild conditions, removal ...

Reactivity of the diphosphinodithio ligated nickel(0) complex toward alkyl halides and resultant nickel(i) and nickel(ii)-alkyl complexes.

Diphosphinodithio ligated complexes of nickel(0), nickel(i) and nickel(ii)-alkyl with a reactivity relevant to the C-C bond formation were described. Stoichiometric reactions of the nickel(0) complex, [(P2S2)Ni] ([1]0, P2S2 = (Ph2PC6H4CH2S)2(C2H4)), with alkyl halides (RX) such as C6H5CH2Br, C2H3CH2Br, C2H5I and (CH3)2CHI were investigated, from which the products were found to be highly dependent on the nature of RX used. Oxidative addition of C2H3CH2Br to [1]0 provides the stable Ni(ii)-alkyl complexes [1...

Characterization of T cell receptors in a novel murine model of nickel-induced intraoral metal contact allergy.

Nickel is a component of several alloy types that are widely used in our environment, including several dental alloy types that cause intraoral metal contact allergy. However, metal-specific immune responses in the oral mucosa have not been elucidated because a suitable animal model has not been established. In this study, we established a novel murine model of nickel-induced intraoral metal contact allergy and aimed to elucidate the immune response in terms of T-cell receptor repertoire and cytokine profil...

Electrochemical fabrication of nickel phosphide/reduced graphene oxide/nickel oxide composite on nickel foam as a high performance electrode for supercapacitors.

Three-dimensional (3D) nickel phosphide/reduced graphene oxide/nickel oxide composite on nickel foam (Ni2P/rGO/NiO/NF) is fabricated as a supercapacitor electrode material via the two-step electrochemical deposition of graphene oxide (GO) and nickel phosphide on the nickel foam. Typically, rGO/NiO/NF is fabricated at first by the electrochemical treatment of nickel foam at 10 V in 0.1 M sulfuric acid with GO for 10 min. The result reveals that NiO nanosheets are vertically grown on the surface of nickel foa...

Nickel-Catalyzed Reductive 2+2 Cycloaddition of Alkynes.

The nickel-catalyzed synthesis of tetrasubstituted cyclobutenes from alkynes is reported. This transformation is uniquely promoted by the use of a primary aminophosphine, an unusual ligand in nickel catalysis. Mechanistic insights for this new transformation are provided, and post-reaction modifications of the cyclobutene products to stereodefined cyclic and acyclic compounds are reported, including the synthesis of epi-truxillic acid.

Interface properties of CoPc and CoPcF16 on graphene/nickel: Influence of germanium intercalation.

Photoelectron spectroscopy was used to investigate electronic interface properties and interactions of the organic semiconductors CoPc and CoPcF16 on graphene/nickel based substrates. Additional focus was put on the influence of germanium intercalation of graphene/nickel. The presented results demonstrate that germanium can decouple graphene from nickel and in this manner restore its buffer layer properties. No charge transfer from the substrate to the organic layer is observed in the germanium intercalated...

Formation Mechanism of a Polyanonic Framework from Layer to Chain Explored by Adjusting Time, Temperature, and pH: Preparation and Characterization of Metal-Complex-Templated 1D Borate and 2D Nickel Borate.

The first column of two-dimensional (2D)-layered metal-complex-templated nickel borate was obtained by using a solvothermal synthesis method. The 2D nickel borate [Ni(en)]·[NiBO(OH)]·Cl (1; en = ethylenediamine) contains [Ni(en)], Cl, and the first reported inorganic nickel borate layer [NiBO(OH)], which is formed by the interconnection of Ni and O atoms in the B-O cluster. By increasing the reaction temperature during the synthesis process of compound 1, the one-dimensional (1D) chain nickel borate [Ni(e...

Application of metallic inks based on nickel-silver core-shell nanoparticles for fabrication of conductive films.

Conductive inks based on nickel nanoparticles (NPs) have attracted much attention as a low-cost replacement for the currently used silver and gold inks for fabrication of printed electronic circuits and devices. Nickel NPs as a component of conductive inks should be stable against oxidation process at all stages of preparation of conductive patterns: ink formulation and storage, printing, and post-printing treatment. In the present study, the oxidation resistance of the Ag layer and the conductive propertie...

Enantioselective Aluminum-Free Alkene Hydroarylations via C-H Activation by a Chiral Nickel/JoSPOphos Manifold.

Highly enantioselective nickel-catalyzed alkene endo-hydroarylations were accomplished with full selectivity via organometallic C-H activation. The asymmetric assembly of chiral six-membered scaffolds proved viable in the absence of pyrophoric organoaluminum reagents within an unprecedented nickel/JoSPOphos manifold.

Unraveling sorption of nickel from aqueous solution by KMnO and KOH-modified peanut shell biochar: Implicit mechanism.

Nickel-containing wastewater is a serious hazard to water environment, so that it is a burning issue to find an efficient and environment-friendly adsorbent. The conventional biochar could not effectively adsorb nickel (Ni(II)), so our study focuses on exploring the adsorption of chemically modified biochar to Ni(II). In this study, the biochar derived from waste peanut shell was modified by KMnO and KOH (MBC). And a series of experiment were carried out to evaluate the sorption ability and explore adsorpti...

Bioaccessibility and relative oral bioavailability of cobalt and nickel in residential soil and dust affected by metal grinding operations.

Including measures of relative bioavailability (RBA) improves the accuracy of site-specific risk assessment when evaluating metals bound in matrices that resist acid digestion (alloys, slag, tailings). In vitro gastrointestinal bioaccessibility and in vivo RBA assessments were conducted using baghouse dust, surface dust, and soil collected in a neighborhood near a metal forge, which emitted metals in the form of corrosion resistant alloys. The study objective was to characterize the in vitro bioaccessibilit...

Mechanism of ultrasonic treatment under nickel salt solution and its effect on electroless nickel plating of carbon fibers.

The carbon fibers were ultrasonically treated under nickel chloride solution, and nickel ions were attached to the surface of the carbon fibers, which replaces the nitric acid oxidation method used in the original electroless nickel plating. Electroless nickel plating was performed on the surface of the carbon fibers using a palladium-free technique successfully. Nickel-plated carbon fibers with a higher weight gain ratio than the original method was obtained. XPS was used to study the functional group chan...

Cyclic Fatigue of Reciproc and Reciproc Blue Nickel-titanium Reciprocating Files at Different Environmental Temperatures.

The aim of the present study was to investigate the impact of ambient temperature on the life span of nickel-titanium (NiTi) files.

In vitro toxicity assessment of zinc and nickel ferrite nanoparticles in human erythrocytes and peripheral blood mononuclear cell.

Ferrite nanoparticles (NPs) have gained attention in biomedicine due to their many potential applications, such as targeted drug delivery, their use as contrast agents for magnetic resonance imaging and oncological treatments. The information about the risk effects of ferrite NPs in human blood cells is, however, scarce. To assess their potential toxicity, in vitro studies were carried out with magnetite and zinc, nickel and nickel‑zinc ferrites NPs at different concentrations (50, 100 and 200 μg·ml)....

Toenail concentrations of zinc, selenium and nickel in patients with chronic recurrent warts: A pilot two-group comparative study.

Normal immune functioning requires sufficient levels of trace elements including zinc and selenium, while elements such as nickel can be immunotoxic.

Stabilization of the Nickel Binding Loop in NiSOD and Related Model Complexes: Thermodynamic and Structural Features.

Detailed equilibrium and spectroscopic characterization of the complex formation processes of the nickel binding loop in NiSOD and its related fragments is reported in the slightly acidic-alkaline pH range. The N-terminally free and protected nonapeptides HCDLPCGVY-NH (NiSODM), HCDLACGVY-NH (NiSODM), and Ac-HCDLPCGVY-NH (NiSODM) and the N-terminally shortened analogues HCDL-NH and HCA-NH were synthesized, and their nickel(II) complexes were studied by potentiometric and several spectroscopic techniques. EPR...

Nickel compounds in the workplaces: Occupations and activities involving high-risk exposures in Italy.

Nickel (Ni) compounds have been classified as carcinogenic to humans. The aim of the study is to evaluate exposures to Ni at workplaces in Italy.

Cancer mortality and exposure to nickel and chromium compounds in a cohort of Italian electroplaters.

Nickel and chromium-VI compounds are carcinogens for lung cancer, although it is still debated if there is an increased risk at low levels of exposure and for other cancers.

Sociology of Nickel Allergy.

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