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https://www.readbyqxmd.com/read/28532066/design-and-characterization-of-a-novel-nickel-free-cobalt-base-alloy-for-intravascular-stents
#1
Qiang Wang, Yibin Ren, M Babar Shahzad, Wei Zhang, Xumeng Pan, Song Zhang, Dan Zhang
Co-Cr-W-Ni alloy (L605) with high tensile strength is used in coronary stents. The thickness of individual strut of the stent is reduced which can decrease the stent restenosis rate. However, about 10% Ni element content in L605 is found to cause allergic reactions and pulmonary embolism, similar to the traditional 316L stainless steel. In this study, a novel nickel-free cobalt-base alloy Co-20Cr-12Fe-18Mn-2Mo-4W-N (wt%) was designed and fabricated in order to efficiently avoid the potential hazards of Ni element...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530750/first-principles-study-of-the-structural-stability-and-electrochemical-properties-of-na2msio4-m-mn-fe-co-and-ni-polymorphs
#2
F Bianchini, H Fjellvåg, P Vajeeston
Sodium orthosilicates Na2MSiO4 (M = Mn, Fe, Co and Ni) have attracted much attention due to the possibility of exchanging two electrons per formula unit. They are also found to exhibit great structural stability due to a diamond-like arrangement of tetrahedral groups. In this work, we have systematically studied the possible polymorphism of these compounds by means of density functional theory, optimising the structure of a number of systems with different group symmetries. The ground state is found to be Pc-symmetric for all the considered M = Mn, Fe, Co, Ni, and several similar structures exhibiting different symmetries coexist within a 0...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530449/a-new-elastic-slot-system-and-v-wire-mechanics
#3
Andrea Wichelhaus
OBJECTIVE: To biomechanically test a new elastic slot system and V-wire mechanics. MATERIALS AND METHODS: Conventional twin and self-ligating brackets and the new elastodynamic bracket were biomechanically tested. The conventional brackets had a rectangular 0.022'' slot and the new elastodynamic bracket had a V-slot, a new slot geometry. Torque measurements were performed with 0.018'' × 0.025'' and 0.019'' × 0.025'' stainless steel (ss) archwires. A nickel-titanium V wire was used for the biomechanical measurements on the elastodynamic bracket...
May 22, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28529797/crystal-structure-of-aqua-trans-bis-dimethyl-sulfoxide-%C3%AE%C2%BAo-pyridine-2-6-di-carboxyl-ato-%C3%AE%C2%BA-3-o-2-n-o-6-nickel-ii
#4
Chen Liu, Ashley C Felts, Daisuke Takahashi, Wesley S Kinden, Khalil A Abboud
In the title complex, [Ni(C7H3NO4)(C2H6OS)2(H2O)], the Ni(II) cation is situated on a twofold rotation axis and exhibits a distorted octa-hedral NO5 coordination environment defined by a tridentate pyridine-2,6-di-carb-oxy-lic acid dianion (dpa(2-)), two dimethyl sulfoxide (DMSO) mol-ecules, and a water mol-ecule. In the crystal, the complex mol-ecules are linked by O-H⋯O and C-H⋯O hydrogen bonds into a three-dimensional network whereby DMSO mol-ecules from neighboring complexes overlap to form layers parallel to (001), alternating with layers of Ni(II)-dpa(2-) moieties...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28528650/the-role-of-intermetal-competition-and-mis-metalation-in-metal-toxicity
#5
Anna Barwinska-Sendra, Kevin J Waldron
The metals manganese, iron, cobalt, nickel, copper and zinc are essential for almost all bacteria, but their precise metal requirements vary by species, by ecological niche and by growth condition. Bacteria thus must acquire each of these essential elements in sufficient quantity to satisfy their cellular demand, but in excess these same elements are toxic. Metal toxicity has been exploited by humanity for centuries, and by the mammalian immune system for far longer, yet the mechanisms by which these elements cause toxicity to bacteria are not fully understood...
2017: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/28527852/cyclic-and-torsional-fatigue-resistance-of-reciprocating-single-files-manufactured-by-different-nickel-titanium-alloys
#6
Murilo P Alcalde, Mario Tanomaru-Filho, Clovis M Bramante, Marco Antonio H Duarte, Juliane Maria Guerreiro-Tanomaru, Jader Camilo-Pinto, Marcus Vinicius Reis Só, Rodrigo Ricci Vivan
INTRODUCTION: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of the following reciprocating single-file systems: ProDesign R 25.06 (Easy Equipamentos Odontológicos, Belo Horizonte, Brazil), Reciproc R25 (VDW GmbH, Munich, Germany), and Unicone L25 (Medin SA, Nové Město in Moravě, Czech Republic). METHODS: Sixty instruments of the ProDesign R, Reciproc R25, and Unicone L25 systems (n = 20) were used. Cyclic fatigue resistance was tested measuring the time to failure in an artificial stainless steel canal with a 60° angle and a 5-mm radius of curvature (n = 10)...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28527848/combined-therapy-for-a-rare-case-of-type-iii-dens-invaginatus-in-a-mandibular-central-incisor-with-a-periapical-lesion-a-case-report
#7
Ping Zhang, Xin Wei
Type III dens invaginatus has a complex root canal structure that poses a greater challenge when endodontic treatment is necessary. Type III dens invaginatus rarely affects mandibular central incisors. In this case, we reported a combined therapy of type III dens invaginatus in a mandibular central incisor with a periapical lesion. Cone-beam computed tomographic (CBCT) imaging was used in the diagnosis and management of the unusual anatomy of dens invaginatus. First, the hard tissue of the dens invaginatus was removed using a dental operating microscope...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28527845/cyclic-fatigue-resistance-of-oneshape-hyflex-edm-waveone-gold-and-reciproc-blue-nickel-titanium-instruments
#8
Mustafa Gündoğar, Taha Özyürek
INTRODUCTION: The purpose of this study was to compare the cyclic fatigue resistances of Reciproc Blue (VDW, Munich, Germany), HyFlex EDM (Coltene/Whaledent, Altstätten, Switzerland), WaveOne Gold (Dentsply Maillefer, Ballaigues, Switzerland), and OneShape (Micro Mega, Besancon, France) single-file NiTi systems. METHODS: Thirty Reciproc Blue R25 (25/.08), 30 HyFlex EDM (25/.∼), 30 WaveOne Gold Primary (25/.07), and 30 OneShape (25/.06) instruments were included in this study...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28526200/nickel-and-ocean-warming-affect-scleractinian-coral-growth
#9
T Biscéré, A Lorrain, R Rodolfo-Metalpa, A Gilbert, A Wright, C Devissi, C Peignon, R Farman, E Duvieilbourg, C Payri, F Houlbrèque
The sensitivity of corals and their Symbiodinium to warming has been extensively documented; however very few studies considered that anthropogenic inputs such as metal pollution have already an impact on many fringing reefs. Thus, today, nickel releases are common in coastal ecosystems. In this study, two major reef-building species Acropora muricata and Pocillopora damicornis were exposed in situ to ambient and moderate nickel concentrations on a short-term period (1h) using benthic chamber experiments. Simultaneously, we tested in laboratory conditions the combined effects of a chronic exposure (8weeks) to moderate nickel concentrations and ocean warming on A...
May 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28525716/diastereoselective-and-catalytic-%C3%AE-alkylation-of-chiral-n-acyl-thiazolidinethiones-with-stable-carbocationic-salts
#10
Stuart C D Kennington, Mònica Ferré, Juan M Romo, Pedro Romea, Fèlix Urpí, Mercè Font-Bardia
Direct nickel-catalyzed alkylation of chiral (N)-acyl-4-isopropyl-1,3-thiazolidine-2- thiones using a commercially available nickel(II) complex, (Me3P)2NiCl2, has been developed for tropylium and trityl tetrafluoroborate salts. The reaction provides a single diastereomer of the corresponding adducts in good to high yields, which, in turn, can be easily converted into a wide array of enantiomerically pure compounds that are difficult to obtain by other asymmetric procedures.
May 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28525708/affinity-based-assembly-of-peptides-on-plasmonic-nanoparticles-delivered-intracellularly-with-light-activated-control
#11
Demosthenes P Morales, William Wonderly, Xiao Huang, Meghan McAdams, Amanda Chron, Norbert O Reich
We report a universal strategy for functionalizing near-infrared light-responsive nanocarriers with both a peptide "cargo" and an orthogonal cell-penetrating peptide. Modularity of both the cargo and internalization peptide attachment are an important feature of these materials relying on the robust affinity of polyhistidine tags to nitrilotriacetic acid in the presence of nickel as well as the affinity of biotin labeled peptides to streptavidin. Attachment to the gold surface uses thiol labeled scaffolds terminated with the affinity partner...
May 19, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28525272/direct-synthesis-of-an-unprecedented-stable-radical-of-nickel-ii-3-5-bis-dimedonyl-azadiisoindomethene-with-strong-and-narrow-near-infrared-absorption-at-%C3%AE-%C3%A2-1000-nm
#12
Elena A Makarova, Yuriy V Zatsikha, Kelly M E Newman, Vinod K Paidi, Valeria A Beletsky, Johan van Lierop, Evgeny A Lukyanets, Victor N Nemykin
An unprecedented stable neutral radical nickel(II) complex of 3,5-bis(dimedonyl)azadiisoindomethene (1) was prepared by the direct reaction between 1,3-diiminoisoindoline and dimedone. A new radical complex 1 has an intense and narrow absorption at 1008 nm and can be reduced to a less stable anionic [1](-) with a typical aza(dibenzo)boron dipyrromethene (aza-BODIPY) UV-vis spectrum. Complex 1, along with two other colored condensation reaction products 2 and 3, was characterized by spectroscopy and X-ray crystallography, while the paramagnetic nature of 1 was probed by EPR and SQUID methods...
May 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28524814/genotoxic-and-cytotoxic-effects-in-exfoliated-buccal-and-nasal-cells-of-chromium-and-cobalt-exposed-electroplaters
#13
Georg Wultsch, Armen Nersesyan, Michael Kundi, Miroslav Mišík, Tahereh Setayesh, Monika Waldherr, Pavel Vodicka, Ludmila Vodickova, Siegfried Knasmüller
Results of a number of studies indicate that electroplaters have increased cancer risks as a consequence of exposure to genotoxic metals such as chromium (VI) and nickel. These effects may be due to induction of damage of the genetic material which plays a key role in the etiology of cancer, and it was found that workers in galvanization factories exhibited increased levels of DNA damage. The aim of the present study was to investigate genetic stability in workers of a bright plating factory who are exposed to chromium (Cr) and cobalt (Co)...
May 19, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28524197/a-cuboidal-ni4o4-cluster-as-a-precursor-for-recyclable-carbon-supported-nickel-nanoparticle-reduction-catalysts
#14
Yan-Qiu Yuan, Feng-Ling Yuan, Fei-Long Li, Zhi-Min Hao, Jun Guo, David J Young, Wen-Hua Zhang, Jian-Ping Lang
Cuboidal [Ni4O4] clusters supported by a pyridine alkoxide ligand have been developed. One of these clusters was selected as a precursor for carbon-hosted Ni nanoparticles (NiNPs/C) which were efficient catalysts for the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) at room temperature.
May 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28523915/wide-temperature-electrolytes-for-lithium-ion-batteries
#15
Qiuyan Li, Shuhong Jiao, Langli Luo, Michael S Ding, Jianming Zheng, Samuel S Cartmell, Chong-Min Wang, Kang Xu, Ji-Guang Zhang, Wu Xu
Formulating electrolytes with solvents of low freezing points and high dielectric constants is a direct approach to extending the service temperature range of lithium (Li)-ion batteries (LIBs). In this work, we report such wide temperature electrolyte formulations by optimizing the content of ethylene carbonate (EC) in the ternary solvent system of EC, propylene carbonate (PC) and ethyl methyl carbonate (EMC) with LiPF6 salt and CsPF6 additive. An extended service temperature range from -40°C to 60°C was obtained in LIBs with lithium nickel cobalt aluminum mixed oxide (LiNi0...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28522809/nickel-cobalt-sulfide-core-shell-structure-on-3d-graphene-for-supercapacitor-application
#16
Lemu Girma Beka, Xin Li, Weihua Liu
Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3-x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521978/influences-of-metal-ions-crosslinked-alginate-based-coatings-on-thermal-stability-and-fire-resistance-of-cotton-fabrics
#17
Ying Pan, Wei Wang, Longxiang Liu, Hua Ge, Lei Song, Yuan Hu
Bio-based and phosphorus-free coating was fabricated by layer-by-layer assembly method to obtain the flame retardant cotton fabric. For the first time, the modified cotton fabrics were prepared by utilizing positively charged polyethylenimine and negatively charged alginate together with subsequent crosslinking of barium, nickel and cobalt ions. Scanning electron microscopy and energy-dispersive X-ray demonstrated that the metal ions crosslinked coating was successfully constructed on the substrate. The thermal stability and flame retardancy were investigated by thermogravimetric analysis (TGA) and horizontal flame tests...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28518207/influence-of-particle-size-and-dielectric-environment-on-the-dispersion-behaviour-and-surface-plasmon-in-nickel-nanoparticles
#18
Vikash Sharma, Chanderbhan Chotia, Tarachand, Vedachalaiyer Ganesan, Gunadhor S Okram
Nickel nanoparticles (NPs) are promising candidates for various applications, including biomedical ones, as they have good magnetic properties as well as high thermal conductivity. We used well-characterized Ni NPs of average Scherrer sizes from 1.31 nm to 22.23 nm and investigated the effects of the primary particle size, size distribution and dielectric environments, and of separately adding non-ionic polyvinylpyrrolidone (PVP), cationic cetyltrimethylammonium bromide (CTAB) and anionic ethylenediaminetetraacetic acid (EDTA) in ethanol, on their stability and agglomeration behaviour using atomic force microscopy (AFM), particle size analysis and zeta potential study through dynamic light scattering (DLS) combined with UV-visible spectroscopy data...
May 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28518042/autochthonous-case-of-eosinophilic-meningitis-caused-by-angiostrongylus-cantonensis-france-2016
#19
Yann Nguyen, Benjamin Rossi, Nicolas Argy, Catherine Baker, Beatrice Nickel, Hanspeter Marti, Virginie Zarrouk, Sandrine Houzé, Bruno Fantin, Agnès Lefort
We report a case of a 54-year-old Moroccan woman living in France diagnosed with eosinophilic meningitis caused by Angiostrongylus cantonensis. Diagnosis was based on clinical symptoms and confirmed by testing of serum and cerebrospinal fluid samples. Physicians should consider the risk for A. cantonensis infection outside of endemic areas.
June 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28517938/glutamate-ligation-in-the-ni-ii-and-co-ii-responsive-escherichia-coli-transcriptional-regulator-rcnr
#20
Carolyn E Carr, Francesco Musiani, Hsin-Ting Huang, Peter T Chivers, Stefano Ciurli, Michael J Maroney
Escherichia coli RcnR (resistance to cobalt and nickel regulator, EcRcnR) is a metal-responsive repressor of the genes encoding the Ni(II) and Co(II) exporter proteins RcnAB by binding to PRcnAB. The DNA binding affinity is weakened when the cognate ions Ni(II) and Co(II) bind to EcRcnR in a six-coordinate site that features a (N/O)5S ligand donor-atom set in distinct sites: while both metal ions are bound by the N terminus, Cys35, and His64, Co(II) is additionally bound by His3. On the other hand, the noncognate Zn(II) and Cu(I) ions feature a lower coordination number, have a solvent-accessible binding site, and coordinate protein ligands that do not include the N-terminal amine...
May 18, 2017: Inorganic Chemistry
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