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Bhanoo Saulick, Vishwakalyan Bhoyroo, Nadeem Nazurally, Bhanooduth Lalljee
Concentrations of heavy metals arsenic, cadmium, lead and mercury and trace elements chromium, copper, nickel and zinc were tested in the muscle tissue of four commercial edible lethrinids fish species from different region of Mauritius. Sky emperor ( Lethrinus mahsena ) was collected from coastal regions as well as offshore regions (banks) for this study. Blackspot emperor ( Lethrinus harak ) and spangled emperor ( Lethrinus nebulosus ) were also studied for their popularity in the fish market. Condition factor was calculated for each fish and the highest value obtained was in Lethrinus mahsena collected from offshore regions (2...
October 20, 2017: Italian Journal of Food Safety
Irfan Qamruddin, Mohammad Khursheed Alam, Habiba Abdullah, Muhammad Abdullah Kamran, Nausheen Jawaid, Verda Mahroof
Objective: The aim of this study was to assess the analgesic effect of a single application of low-level laser therapy (LLLT) on spontaneous pain and pain on chewing after placement of initial archwires. Methods: Forty-two patients (26 women, 16 men) were randomly recruited for this split-mouth randomized clinical trial. Each patient received super-elastic nickel-titanium (NiTi) initial archwires (0.012, 0.014, 0.016, and 0.018-inch [in]) in the maxilla for leveling and alignment for an interval of 4 weeks between archwires...
March 2018: Korean Journal of Orthodontics
Chang Xu, Wen-Hao Guo, Xu He, Yin-Long Guo, Xue-Ying Zhang, Xingang Zhang
Relatively low reactivity hinders using chlorodifluoromethane (ClCF2 H) for general difluoromethylation with organic molecules, despite its availability as an inexpensive industrial chemical. To date, transformations of ClCF2 H are very limited and most of them involve difluorocarbene intermediate. Here, we describe a strategy for difluoromethylation of aromatics through nickel-catalyzed cross-coupling of ClCF2 H with readily accessible (hetero)aryl chlorides. The reaction proceeds under mild reaction conditions with high efficiency and features synthetic simplicity without preformation of arylmetals and broad substrate scope, including a variety of heteroaromatics and commercially available pharmaceuticals...
March 21, 2018: Nature Communications
Mateja Hajdinjak, Qiaomei Fu, Alexander Hübner, Martin Petr, Fabrizio Mafessoni, Steffi Grote, Pontus Skoglund, Vagheesh Narasimham, Hélène Rougier, Isabelle Crevecoeur, Patrick Semal, Marie Soressi, Sahra Talamo, Jean-Jacques Hublin, Ivan Gušić, Željko Kućan, Pavao Rudan, Liubov V Golovanova, Vladimir B Doronichev, Cosimo Posth, Johannes Krause, Petra Korlević, Sarah Nagel, Birgit Nickel, Montgomery Slatkin, Nick Patterson, David Reich, Kay Prüfer, Matthias Meyer, Svante Pääbo, Janet Kelso
Although it has previously been shown that Neanderthals contributed DNA to modern humans, not much is known about the genetic diversity of Neanderthals or the relationship between late Neanderthal populations at the time at which their last interactions with early modern humans occurred and before they eventually disappeared. Our ability to retrieve DNA from a larger number of Neanderthal individuals has been limited by poor preservation of endogenous DNA and contamination of Neanderthal skeletal remains by large amounts of microbial and present-day human DNA...
March 21, 2018: Nature
Subhasis Das, Manideepa Sengupta, Arijit Bag, Mumtaj Shah, Ankur Bordoloi
A synergistic approach was made to develop a highly stable and carbon resistant catalyst system based on cobalt and nickel supported over modified mesoporous silica for the dry reforming of methane (DRM). Modified mesoporous silica is prepared by a hydrothermal method, and the total Co & Ni composition is taken at around 5% by using the deposition-precipitation technique. CO2 reforming with methane was performed at 400-800 °C under atmospheric pressure as well as at a pressure of 1 MPa, keeping the CH4/CO2 ratio equal to unity...
March 21, 2018: Nanoscale
Papatpong Phermsang-Ngarm, Chairat Charoemratrote
OBJECTIVES: To compare tooth movement achieved, time required for alignment, root resorption, and alveolar bone thickness changes during initial dental alignment between groups treated with 0.012-inch preformed heat-activated or customized nickel titanium (NiTi) archwires. MATERIALS AND METHODS: Thirty-two subjects (mean age 19.8 ± 1.7 years) with severe crowding of maxillary anterior teeth had premolar extractions and were randomly allocated into control and experimental groups receiving preformed heat-activated and customized NiTi archwires, respectively...
March 21, 2018: Angle Orthodontist
Jessica Henoch, Armin Auch, Fatima Diab, Klaus Eichele, Hartmut Schubert, Peter Sirsch, Theresa Block, Rainer Pöttgen, Lars Wesemann
1,1'-Dilithioferrocene was reacted with 2 equiv of isopropyl (Ar*) or methyl (Ar') substituted terphenyl tin(II) chloride. Reaction product 1, carrying the bulkier terphenyl substituent Ar*, displays a bis(stannylene) structure in the solid state without formation of a tin-tin bond. Temperature-dependent solution119 Sn NMR spectroscopy, however, revealed a dynamic interplay between bis(stannylene) (100 °C) and cyclic distannene (-80 °C). In contrast to 1, the less bulky Ar' substituent results in a cyclic distannene 2...
March 21, 2018: Inorganic Chemistry
Ciro Romano, Clément Mazet
Starting from readily available alkenyl methyl ethers, the stereoselective preparation of highly substituted alkenes by two complementary multicatalytic sequential isomerization/cross-coupling sequences is described. Both elementary steps of these sequences are challenging processes when considered independently. A cationic iridium catalyst was identified for the stereoselective isomerization of allyl methyl ethers and was found to be compatible with a nickel catalyst for the subsequent cross-coupling of the in situ generated methyl vinyl ethers with various Grignard reagents...
March 21, 2018: Journal of the American Chemical Society
Long Peng, Zheqi Li, Guoyin Yin
A novel method to access 1,1-diarylalkanes from readily available, nonactivated alkyl bromides and aryl bromides via visible-light-driven nickel and iridium dual catalysis, wherein diisopropylamine (i Pr2 NH) is used as the terminal stoichiometric reductant, is reported. Both primary and secondary alkyl bromides can be successfully transformed into the migratory benzylic arylation products with good selectivity. Additionally, this method showcases tolerance toward a wide array of functional groups and the presence of bases...
March 21, 2018: Organic Letters
Tanguy Jaffré, Roger D Reeves, Alan J M Baker, Henk Schat, Antony van der Ent
No abstract text is available yet for this article.
April 2018: New Phytologist
Dalton B Burks, Shakeyia Davis, Robert W Lamb, Xuan Liu, Roberta R Rodrigues, Nalaka P Liyanage, Yujie Sun, Charles Edwin Webster, Jared H Delcamp, Elizabeth T Papish
The first example of a CNC pincer ligand with a central pyridinol ligand is reported in a nickel(ii) complex. This metal complex can be protonated or deprotonated reversibly in situ to switch on or off the photocatalytic performance towards CO2 reduction. The O- substituent appears essential for catalysis.
March 21, 2018: Chemical Communications: Chem Comm
Ralph Witzgall
Primary cilia represent small, yet distinct compartments of the plasma membrane. They are speculated to exercise chemo- and mechanosensory functions and to serve as signaling hubs for crucial pathways such as the Wnt and hedgehog cascades. It is therefore necessary that specific integral membrane proteins, in particular sensors and receptors, are sorted to the cilium and not to the surrounding somatic plasma membrane upon being synthesized at the rough endoplasmic reticulum. Apparently no singular "zip code" for the primary cilium exists but rather several ciliary targeting signals whose biochemical and cell biological implications are just about being unravelled...
March 17, 2018: Seminars in Cell & Developmental Biology
Hiromu Fuse, Masahiro Kojima, Harunobu Mitsunuma, Motomu Kanai
A hybrid catalysis that comprises an acridinium photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst-enabled acceptorless dehydrogenation of hydrocarbons is reported. The cationic nickel complex played a critical role in the reactivity. This is the first example of acceptorless dehydrogenation of hydrocarbons by base metal catalysis under mild reaction conditions of visible light irradiation at room temperature.
March 20, 2018: Organic Letters
Lan Hui, Dianzeng Jia, Huidi Yu, Yurui Xue, Yuliang Li
We employed a two-step strategy for preparing ultrathin graphdiyne-wrapped iron carbonate hydroxide nanosheets on nickel foam (FeCH@GDY/NF) as the efficient catalysts toward the electrical splitting water. The introduction of naturally porous GDY nanolayers on FeCH surface endows the pristine catalyst with structural advantages for boosting catalytic performances. Benefited from the protection of robust GDY nanolayers with intimate contact between GDY and FeCH, the combined material exhibits high long-term durability of 10 000 cycles for oxygen-evolution reaction (OER) and 9000 cycles for hydrogen evolution reaction (HER) in 1...
March 20, 2018: ACS Applied Materials & Interfaces
Min Zhou, Qunhong Weng, Zakhar I Popov, Yijun Yang, Liubov Yu Antipina, Pavel B Sorokin, Xi Wang, Yoshio Bando, Dmitri Golberg
Electrocatalytic hydrogen evolution reaction (HER) in alkaline solution is hindered by its sluggish kinetics toward water dissociation. Nickel-based catalysts, as low-cost and effective candidates, show great potentials to replace platinum (Pt)-based materials in the alkaline media. The main challenge regarding this type of catalysts is their relatively poor durability. In this work, we conceive and construct a charge-polarized carbon layer derived from carbon quantum dots (CQDs) on Ni3 N nanostructure (Ni3 N@CQDs) surfaces, which simultaneously exhibit durable and enhanced catalytic activity...
March 20, 2018: ACS Nano
Hossein Faghihian, Zahra Adibmehr
Novel magnetic ion-imprinted polymer was prepared by use of SBA-15 as functional monomer, ethylene glycol dimethacrylate as cross linker, diphenylcarbazide as ligand, and Cd2+ , Cu2+ , and Ni2+ as the template of ion source. The adsorption capacity of the synthesized adsorbent was 111, 95, and 87 mg g-1 , respectively for cadmium, copper, and nickel. The selectivity of the adsorbents examined in the presence of different cations including Na+ , K+ , Ca2+ , Mg2+ , Zn2+ , Co2+ , Fe2+ , Mn2+ , Hg2+ , and Pb2+ indicated that the synthesized ion-imprinted adsorbents were highly selective for the appropriate cations...
March 19, 2018: Environmental Science and Pollution Research International
Weixiang Liu, Yukun Qin, Song Liu, Ronge Xing, Huahua Yu, Xiaolin Chen, Kecheng Li, Pengcheng Li
Based on a condensation reaction, a chitosan-derivative-bearing amino pyridine group was prepared and subsequently followed by coordination with cupric ions, zinc ions and nickel ions to synthesize chitosan metal complexes. The calculations using the density functional theory (DFT) show that the copper ions and nickel ions underwent dsp2 hybridization, the zinc ions underwent sp3 hybridization, and they all formed a coordination bond with the carbon atom in the p-π conjugate group. The antifungal properties of O-CSPX-M against Phytophthora capsici (P...
March 19, 2018: Scientific Reports
Matteo Ugolini, Jenny Gerhard, Sanne Burkert, Kristoffer Jarlov Jensen, Philipp Georg, Friederike Ebner, Sarah M Volkers, Shruthi Thada, Kristina Dietert, Laura Bauer, Alexander Schäfer, Elisa T Helbig, Bastian Opitz, Florian Kurth, Saubashya Sur, Nickel Dittrich, Sumanlatha Gaddam, Melanie L Conrad, Christine S Benn, Ulrike Blohm, Achim D Gruber, Andreas Hutloff, Susanne Hartmann, Mark V Boekschoten, Michael Müller, Gregers Jungersen, Ralf R Schumann, Norbert Suttorp, Leif E Sander
Live attenuated vaccines are generally highly efficacious and often superior to inactivated vaccines, yet the underlying mechanisms of this remain largely unclear. Here we identify recognition of microbial viability as a potent stimulus for follicular helper T cell (TFH cell) differentiation and vaccine responses. Antigen-presenting cells (APCs) distinguished viable bacteria from dead bacteria through Toll-like receptor 8 (TLR8)-dependent detection of bacterial RNA. In contrast to dead bacteria and other TLR ligands, live bacteria, bacterial RNA and synthetic TLR8 agonists induced a specific cytokine profile in human and porcine APCs, thereby promoting TFH cell differentiation...
March 19, 2018: Nature Immunology
Qing Ye, Jian-Hua Mao, Qiang Shu, Shi-Qiang Shang
BACKGROUND: Our previous study found that most of MPP patients had elevated serum total IgE levels. OBJECTIVE: The purpose of this paper is to determine components of mycoplasma pneumoniae that can cause IgE increase in children, and to clarify its specific mechanism. METHODS: The components of MP cells were isolated by serum IgE from patients with MP pneumonia (MPP). These components obtained through the prokaryotic expression were used as allergens to detect the proportion of allergen-specific IgE produced in MPP patients, and the clinical characteristics and related immune parameters of these patients who produced this allergen-specific IgE were also analyzed...
March 16, 2018: Annals of Allergy, Asthma & Immunology
Amal Mohamed Kamal El Safty, Aisha Mohamed Samir, Mona Kamal Mekkawy, Marwa Mohamed Fouad
Using chromium and nickel for electroplating is important in many industries. This process induces variable adverse health effects among exposed workers. The aim of this study is to detect the genotoxic effects of combined exposure to chromium and nickel among electroplating workers. This study was conducted on 41 male workers occupationally exposed to chromium and nickel in the electroplating section of a factory compared to 41 male nonexposed individuals, where full history and clinical examination were performed...
January 1, 2018: International Journal of Toxicology
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