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https://www.readbyqxmd.com/read/28641054/behavioural-interventions-to-reduce-nickel-exposure-in-a-nickel-processing-plant
#1
Krassi Rumchev, Helen Brown, Amanda Wheeler, Gavin Pereira, Jeff Spickett
Nickel is a widely used material in many industries. Although, there is enough evidence that occupational exposure to nickel may cause respiratory illnesses, allergies and even cancer, it is not possible to stop the use of nickel in occupational settings. Nickel exposure, however, can be controlled and reduced significantly in workplaces. The main objective of this study was to assess if educational intervention of hygiene behaviour could reduce nickel exposure among Indonesian nickel smelter workers. Participants were randomly assigned to three intervention groups (n = 99)...
June 22, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28636596/selective-sp-3-c-h-alkylation-via-polarity-match-based-cross-coupling
#2
Chip Le, Yufan Liang, Ryan W Evans, Ximing Li, David W C MacMillan
The functionalization of carbon-hydrogen (C-H) bonds is one of the most attractive strategies for molecular construction in organic chemistry. The hydrogen atom is considered to be an ideal coupling handle, owing to its relative abundance in organic molecules and its availability for functionalization at almost any stage in a synthetic sequence. Although many C-H functionalization reactions involve C(sp(3))-C(sp(2)) coupling, there is a growing demand for C-H alkylation reactions, wherein sp(3) C-H bonds are replaced with sp(3) C-alkyl groups...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28636185/decarboxylative-alkynylation
#3
Joel M Smith, Tian Qin, Rohan R Merchant, Jacob T Edwards, Lara R Malins, Zhiqing Liu, Guanda Che, Zichao Shen, Scott A Shaw, Martin D Eastgate, Phil S Baran
The development of a new decarboxylative cross-coupling protocol that affords terminal and substituted alkynes from various carboxylic acids is described using both nickel- and iron-based catalysts. The use of N-hydroxytetrachlorophthalimide (TCNHPI) esters is crucial to the success of the transformation, and the reaction is amenable to in situ carboxylic acid activation. Additionally, an inexpensive, commercially-available alkyne source is employed in this formal homologation process that serves as a surrogate for other well-established alkyne syntheses...
June 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28636128/phosphonium-salts-as-pseudohalides-regioselective-ni-catalyzed-cross-coupling-of-complex-pyridines-and-diazines
#4
Andrew McNally, Xuan Zhang
Heterobiaryls are important pharmacophores that are challenging to prepare by traditional cross-coupling methods. An alternative approach is presented where pyridines and diazines are converted to heteroaryl phosphonium salts and coupled with arylboronic acids. Nickel catalysts are unique for selective heteroaryl transfer, and the reaction has a broad substrate scope that includes complex pharmaceuticals. Phosphonium ions also display orthogonal reactivity in cross-couplings compared to halides enabling chemoselective palladium and nickel-catalyzed coupling sequences...
June 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28635618/nickel-cobaltite-nanosheets-strongly-anchored-on-boron-and-nitrogen-co-doped-graphene-for-high-performance-asymmetric-supercapacitors
#5
Xinyan Jiao, Xifeng Xia, Peng Liu, Wu Lei, Yu Ouyang, Qingli Hao
Strongly coupled boron and nitrogen co-doped graphene (BN-G) hybrids with nickel cobaltite (NiCo2O4) nanosheets (NCO/BN-G) were fabricated by a facile soft-chemical method for asymmetric supercapacitors with high-performance. The strong interaction between BN-G and NiCo2O4 nanosheets are explored by various techniques. The effect of heteroatom doping on electrochemical properties of the hybrids is systematically investigated. The strong synergistic effect between NiCo2O4 and BN-G leads to a specific capacitance of 106...
June 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28634033/nickel-sulfate-promotes-il-17a-producing-cd4-t-cells-by-an-il-23-dependent-mechanism-regulated-by-tlr4-and-jak-stat-pathways
#6
Rami Bechara, Diane Antonios, Hayat Azouri, Marc Pallardy
Allergic contact dermatitis, caused by nickel, is a delayed-type hypersensitivity reaction and 14.5% of the general population may be affected in Europe. Among a wide range of cytokines, the IL-12 family has unique structural and immunological characteristics. While IL-12p70 promotes T helper (Th) 1 cells polarization, IL-23 promotes Th17 cells development and both have been isolated from nickel-allergic patients. In this work, we were interested in understanding the mechanism behind nickel-induced Th17 cells development...
June 17, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28632927/prospective-associations-between-environmental-heavy-metal-exposure-and-renal-outcomes-in-adults-with-chronic-kidney-disease
#7
Chun-Chieh Tsai, Chia-Lin Wu, Chew-Teng Kor, Ie-Bin Lian, Chin-Hua Chang, Teng-Hsiang Chang, Chia-Chu Chang, Ping-Fang Chiu
BACKGROUND: In Taiwan, Changhua County residents were exposed to high heavy metal pollution and exhibited high heavy metal levels in blood and urine. We examined associations between heavy metals in residential soil and renal outcomes of residents with chronic kidney disease (CKD). METHOD: From January 01, 2003 to June 30, 2015, we retrospectively identified CKD patients with an estimated glomerular filtration rate of <60 mL/min/1.73 m(2) at one tertiary care center...
June 20, 2017: Nephrology
https://www.readbyqxmd.com/read/28632325/nickelocene-precursor-facilitated-fast-growth-of-graphene-h-bn-vertical-heterostructures-and-its-applications-in-oleds
#8
Qiucheng Li, Zifeng Zhao, Baoming Yan, Xiuju Song, Zhepeng Zhang, Jia Li, Xiaosong Wu, Zuqiang Bian, Xiaolong Zou, Yanfeng Zhang, Zhongfan Liu
The direct growth of high-quality, large-area, uniform, vertically stacked Gr/h-BN heterostructures is of vital importance for applications in electronics and optoelectronics. However, the main challenge lies in the catalytically inert nature of the hexagonal boron nitride (h-BN) substrates, which usually afford a rather low decomposition rate of carbon precursors, and thus relatively low growth rate of graphene. Herein, a nickelocene-precursor-facilitated route is developed for the fast growth of Gr/h-BN vertical heterostructures on Cu foils, which shows much improved synthesis efficiency (8-10 times faster) and crystalline quality of graphene (large single-crystalline domain up to ≈20 µm)...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631465/an-interfacial-investigation-on-printable-carbon-based-mesoscopic-perovskite-solar-cells-with-niox-c-back-electrode
#9
Fatemeh Behrouznejad, Cheng-Min Tsai, Sudhakar Narra, Eric W-G Diau, Nima Taghavinia
Solar cells with high-efficiency, low-cost and high-stability are the target for the new generation of solar cells. A fully printable perovskite (CH3NH3PbI3) solar cell (PSC) with device architecture FTO/TiO2/Al2O3/NiOx/C is fabricated in the current research as a low-cost and relatively stable structure and is investigated to determine how different fabrication factors such as the thickness of the insulating spacer layer (Al2O3) or treatments such as heat and UV-O3 treatments can affect the interfacial properties of this multi-layer mesoporous structure...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631381/tec-controls-pluripotency-and-early-cell-fate-decisions-of-human-pluripotent-stem-cells-via-regulation-of-fgf2-secretion
#10
Tereza Vanova, Zaneta Konecna, Zuzana Zbonakova, Giuseppe La Venuta, Karolina Zoufalova, Sarka Jelinkova, Miroslav Varecha, Vladimir Rotrekl, Pavel Krejci, Walter Nickel, Petr Dvorak, Michaela Kunova Bosakova
Human pluripotent stem cells (hPSC) require signaling provided by fibroblast growth factor (FGF) receptors. This can be initiated by the recombinant FGF2 ligand supplied exogenously, but hPSC further support their niche by secretion of endogenous FGF2. In this study, we describe a role of TEC kinase (tyrosine kinase expressed in hepatocellular carcinoma) in this process. We show that TEC-mediated FGF2 secretion is essential for hPSC self-renewal, and its lack mediates specific differentiation. Following both shRNA- and siRNA-mediated TEC knock-down, hPSC secrete less FGF2...
June 20, 2017: Stem Cells
https://www.readbyqxmd.com/read/28630394/moringa-oleifera-based-diet-protects-against-nickel-induced-hepatotoxicity-in-rats
#11
Stephen Adeyemi Oluyomi, Sokolayemji Aroge Cincin, Adewumi Akanji Musbau
Multiple health-promoting effects have been attributed to the consumption of Moringa oleifera leaves, as part of diet without adequate scientific credence. This study evaluated the effect of M. oleifera-based diets on nickel (Ni) - induced hepatotoxicity in rats. Male rats assigned into six groups were given oral administration of 20 mg/kg body weight nickel sulfate in normal saline and either fed normal diet or M. oleifera-based diets for 21 days. All animals were sacrificed under anesthesia 24 hours after the last treatment...
June 20, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28628796/evaluation-of-cd-cr-cu-ni-and-pb-in-selected-cosmetic-products-from-jordanian-sudanese-and-syrian-markets
#12
A M Massadeh, M Y El-Khateeb, S M Ibrahim
OBJECTIVES: There is no sufficient data that evaluate heavy metal content in cosmetic products in Jordan as well as Sudan and Syria. This study aims to assess metal levels which include Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), and Lead (Pb) in cosmetic products. These elements have draft limits because they are identified as potential impurities and are known to be toxic. This study aims to provide information to the population that may be beneficial to public health. STUDY DESIGN: Samples were collected from different brands obtained from markets in Jordan, Sudan, and Syria...
June 16, 2017: Public Health
https://www.readbyqxmd.com/read/28628268/nico2-s4-materials-for-supercapacitor-applications
#13
REVIEW
Yong-Ping Gao, Ke-Jing Huang
Cobalt-nickel sulfide (NiCo2 S4 ) shows extensive potential for innovative photoelectronic and energetic materials owing to distinctive physical and chemical properties. In this review, representative strategies for the fabrication and application of NiCo2 S4 and composite nanostructures are outlined for supercapacitors, with the aim of promoting the development of NiCo2 S4 and their composites in the supercapacitor field through an analysis and comparison of diverse nanostructures. A brief introduction into the structures, properties, and morphologies are presented...
June 19, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28627895/electroanalytical-assessment-of-the-effect-of-ni-fe-stoichiometry-and-architectural-expression-on-the-bifunctional-activity-of-nanoscale-niyfe1-yox
#14
Jesse S Ko, Christopher N Chervin, Mallory N Vila, Paul A DeSario, Joseph F Parker, Jeffrey W Long, Debra R Rolison
Electrocatalysis of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) was assessed for a series of Ni-substituted ferrites (NiyFe1-yOx, where y = 0.1 to 0.9) as expressed in porous, high-surface-area forms (ambigel and aerogel nanoarchitectures). We then correlate electrocatalytic activity with Ni:Fe stoichiometry as a function of surface area, crystallite size, and free volume. In order to ensure in-series comparisons, calcination at 350 °C/air was necessary to crystallize the respective NiyFe1-yOx nanoarchitectures, which index to the inverse spinel structure for Fe-rich materials (y ≤ 0...
June 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28627580/cation-distribution-and-vacancies-in-nickel-cobaltite
#15
Danilo Loche, Claudia Marras, Daniela Carta, Maria Francesca Casula, Gavin Mountjoy, Anna Corrias
Samples of nickel cobaltite, a mixed oxide occurring in the spinel structure which is currently extensively investigated because of its prospective application as ferromagnetic, electrocatalytic, and cost-effective energy storage material were prepared in the form of nanocrystals stabilized in a highly porous silica aerogel and as unsupported nanoparticles. Nickel cobaltite nanocrystals with average size 4 nm are successfully grown for the first time into the silica aerogel provided that a controlled oxidation of the metal precursor phases is carried out, consisting in a reduction under H2 flow followed by mild oxidation in air...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28627496/controllable-synthesis-of-nickel-bicarbonate-nanocrystals-with-high-homogeneity-for-high-performance-supercapacitor
#16
Jianmin Gu, Xin Liu, Zhuang Wang, Zhenpan Bian, Cuihong Jin, Xiao Sun, Baipeng Yin, Tianhui Wu, Lin Wang, Shoufeng Tang, Hongchao Wang, Fa-Ming Gao
The electrochemical performance for supercapacitors might be associated with the homogeneous structure of the electrode materials. However, the relation between the degree of uniformity for the electrode materials and the electrochemical performance of the supercapacitor is not clear. Herein, we synthesize two types of nickel bicarbonate nanocrystals with different degree of uniformity for investigating the relationship. The nickel bicarbonate nanocrystals with the homogeneous structure, as the electroactive materials, could provide larger space and offer more exposed atoms for the electrochemical reaction than the nanocrystals with the heterogeneous structure, which exhibits better electrochemical performances...
June 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28627111/european-surveillance-system-on-contact-allergies-essca-results-with-the-european-baseline-series-2013-14
#17
W Uter, J C Amario-Hita, A Balato, B Ballmer-Weber, A Bauer, A Belloni Fortina, A Bircher, M M U Chowdhury, S M Cooper, A Dugonik, R Gallo, A Giménez-Arnau, J D Johansen, S M John, M Kieć-Świerczyńska, T Kmecl, B Kręcisz, F Larese Filon, V Mahler, M Pesonen, T Rustemeyer, A Sadowska-Przytocka, J Sánchez-Perez, S Schliemann, M L Schuttelaar, D Simon, R Spiewak, S Valiukeviciene, E Weisshaar, I R White, S M Wilkinson
BACKGROUND: Contact allergy is a common condition and can severely interfere with daily life or professional activities. Due to changes in exposures, a consequence of introduction of new substances, new products or formulations, and regulatory intervention, the spectrum of contact sensitisation changes. OBJECTIVE: To evaluate the current spectrum of contact allergy to allergens present in the European baseline series (EBS) across Europe. METHODS: Retrospective analysis of data collected by the European Surveillance System on Contact Allergies (ESSCA, www...
June 19, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28626933/conductive-carbon-nitride-for-excellent-energy-storage
#18
Jijian Xu, Feng Xu, Meng Qian, Fangfang Xu, Zhanglian Hong, Fuqiang Huang
Conductive carbon nitride, as a hypothetical carbon material demonstrating high nitrogen doping, high electrical conductivity, and high surface area, has not been fabricated. A major challenge towards its fabrication is that high conductivity requires high temperature synthesis, but the high temperature eliminates nitrogen from carbon. Different from conventional methods, a facile preparation of conductive carbon nitride from novel thermal decomposition of nickel hydrogencyanamide in a confined space is reported...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28626599/breaking-amides-using-nickel-catalysis
#19
Jacob E Dander, Neil K Garg
Amides have been widely studied for decades, but their synthetic utility has remained limited in reactions that proceed with rupture of the amide C-N bond. Using Ni catalysis, we have found that amides can now be strategically employed in several important transformations: esterification, transamidation, Suzuki-Miyaura couplings, and Negishi couplings. These methodologies provide exciting new tools to build C-heteroatom and C-C bonds using an unconventional reactant (i.e., the amide), which is ideally suited for use in multi-step synthesis...
February 3, 2017: ACS Catalysis
https://www.readbyqxmd.com/read/28625981/heterologous-expression-of-the-clostridium-carboxidivorans-co-dehydrogenase-alone-or-together-with-the-acetyl-coa-synthase-enables-clostridium-acetobutylicum-to-both-reduce-co2-and-oxidize-co
#20
Ellinor D Carlson, Eleftherios T Papoutsakis
With recent advances in synthetic biology, CO2 could be utilized as a carbon feedstock by native or engineered organisms, assuming the availability of electrons. Two key enzymes used in autotrophic CO2 fixation are the CO dehydrogenase (CODH) and acetyl-CoA synthase (ACS), which form a bifunctional heterotetrameric complex. CODH/ACS can reversibly catalyze CO2 to CO, effectively enabling a biological water-gas shift reaction at ambient temperatures and pressures. The CODH/ACS complex is part of the Wood-Ljungdahl pathway (WLP) used by acetogens to fix CO2 and has been well characterized in native hosts...
June 16, 2017: Applied and Environmental Microbiology
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