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Metal on metal

Lucas C Wheeler, Micah T Donor, James S Prell, Michael J Harms
The S100 proteins are a large family of signaling proteins that play critical roles in biology and disease. Many S100 proteins bind Zn2+, Cu2+, and/or Mn2+ as part of their biological functions; however, the evolutionary origins of binding remain obscure. One key question is whether divalent transition metal binding is ancestral, or instead arose independently on multiple lineages. To tackle this question, we combined phylogenetics with biophysical characterization of modern S100 proteins. We demonstrate an earlier origin for established S100 subfamilies than previously believed, and reveal that transition metal binding is widely distributed across the tree...
2016: PloS One
Shiwan K Shah, Jeffrey H Jennings, Javier I Diaz-Mendoza, Lenar Yessayan, Cynthia Ray, Michael J Simoff
BACKGROUND: Despite their safety profile, self-expanding metallic stents (SEMS) have been difficult to remove. We aim to describe our experience in removal of SEMS at Henry Ford Hospital with a specific emphasis on safety. METHODS: We reviewed the charts of all patients who underwent removal of a SEMS at Henry Ford Hospital between 2003 and 2013. We recorded demographic information, indication for initial stent placement, indication for stent removal, time to stent removal, procedure of removal, and any complications...
October 2016: Journal of Bronchology & Interventional Pulmonology
Z W Teo Wendy, P C Schalock
The use of metals in the medical field has become increasingly prevalent over the past few decades. Patients find themselves being exposed to metals in a variety of ways, ranging from external exposure to instruments such as the stainless steel in surgical blades to internal exposure via medical devices being implanted in their bodies. There has been growing interest in the possibility of developing hypersensitivity reactions to constituent metals in medical implant devices, both in cutaneous and systemic forms...
October 2016: Journal of Investigational Allergology & Clinical Immunology
Chong-Rong Wu, Xiang-Rui Chang, Tung-Wei Chu, Hsuan-An Chen, Chao-Hsin Wu, Shih-Yen Lin
A 9-layer WS2/MoS2 hetero-structure is established on a sapphire substrate after sequential growth of large-area and uniform 5- and 4- layer MoS2 and WS2 films by using sulfurization of pre-deposited 1.0 nm Molybdenum (Mo) and Tungsten (W), respectively. By using the results obtained from the ultraviolet photoelectron spectroscopy and the absorption spectrum measurements of the standalone MoS2 and WS2 samples, a type-II band alignment is predicated for the WS2/MoS2 hetero-structure. Increasing drain currents and enhanced field-effect mobility value of the transistor fabricated on the hetero-structure suggested that a channel with higher electron concentration compared with the standalone MoS2 transistor channel is obtained with electron injection from WS2 to MoS2 under thermal equilibrium...
October 20, 2016: Nano Letters
Vitthal B Saptal, Bhalchandra M Bhanage
A series of highly efficient, bifunctional ionic liquids containing a quaternary alkyl ammonium cation and an amine anion were prepared from choline and amino acids, respectively. Nine ILs were synthesized, characterized, and applied as organocatalysts for the chemical fixation of carbon dioxide to form cyclic carbonates and quinazoline-2,4(1 H,3 H)-diones. A binary mixture of an IL and a co-catalysts generates deep eutectic solvents (DESs) and accelerates the rate of the cycloaddition reaction at atmospheric pressure and low temperature (70 °C)...
October 20, 2016: ChemSusChem
Narcis Avarvari, Thomas Biet, Kévin Martin, Jihane Hankache, Nora Hellou, Andreas Hauser, Thomas Bürgi, Nicolas Vanthuyne, Tal Aharon, Marco Caricato, Jeanne Crassous
Introduction of heterocycles in the helical skeleton of helicenes allows modulation of their redox, chiroptical and photophysical properties. Herein, we describe the straightforward preparation and structural characterization by single crystal X-ray diffraction of thiadiazole-[7]helicene, which has been resolved into (M) and (P) enantiomers by chiral HPLC, together with its S-shaped double [4]helicene isomer, as well as the smaller congeners thiadiazole-[5]helicene and benzothiadiazole-anthracene. A copper(II) complex with two thiadiazole-[5]helicene ligands has been structurally characterized and it shows the presence of both (M) and (P) isomers coordinated to the metal centre...
October 20, 2016: Chemistry: a European Journal
Eksp Lomakin
This article was designed to discuss the possibility of discovering the trace deposits of a metal (aluminium) sedimented on various objects with the use of the indicator alizarin S in order to determine the distance of the shot and identify the concrete traumatic weapons of the «Osa», «Strazhnik» type used for the purpose.
2016: Sudebno-meditsinskaia Ekspertiza
Nishone Thompson, Zainab Boone-Kukoyi, Raquel Shortt, Carisse Lansiquot, Bridgit Kioko, Enock Bonyi, Salih Toker, Birol Ozturk, Kadir Aslan
Gout is caused by the overproduction of uric acid and the inefficient metabolism of dietary purines in humans. Current treatments of gout, which include anti-inflammatory drugs, cyclooxygenase-2 inhibitors, and systemic glucocorticoids, have harmful side-effects. Our research laboratory has recently introduced an innovative approach for the decrystallization of biological and chemical crystals using the Metal-Assisted and Microwave-Accelerated Evaporative Decrystallization (MAMAD) technique. In the MAMAD technique, microwave energy is used to heat and activate gold nanoparticles that behave as "nano-bullets" to rapidly disrupt the crystal structure of biological crystals placed on planar surfaces...
October 18, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiangao Zhang, Mingzhen Shao, Xiaoqi Zeng
In this paper, a type of compact nanosensor based on a metal-insulator-metal structure is proposed and investigated through cascading double asymmetric cavities, in which their metal cores shift along different axis directions. The cascaded asymmetric structure exhibits high transmission and sharp Fano resonance peaks via strengthening the mutual coupling of the cavities. The research results show that with the increase of the symmetry breaking in the structure, the number of Fano resonances increase accordingly...
October 18, 2016: Sensors
Sorina Motoc, Florica Manea, Adriana Iacob, Alberto Martinez-Joaristi, Jorge Gascon, Aniela Pop, Joop Schoonman
In this study, the detection protocols for the individual, selective, and simultaneous determination of ibuprofen (IBP) and diclofenac (DCF) in aqueous solutions have been developed using HKUST-1 metal-organic framework-carbon nanofiber composite (HKUST-CNF) electrode. The morphological and electrical characterization of modified composite electrode prepared by film casting was studied by scanning electronic microscopy and four-point-probe methods. The electrochemical characterization of the electrode by cyclic voltammetry (CV) was considered the reference basis for the optimization of the operating conditions for chronoamperometry (CA) and multiple-pulsed amperometry (MPA)...
October 17, 2016: Sensors
Sujin Seo, Huiyeong Ju, Seulgi Kim, In-Hyeok Park, Eunji Lee, Shim Sung Lee
Homo- and heteronuclear group 12 metal (Zn(2+), Cd(2+), and Hg(2+)) complexes 1-6 containing a newly designed 18-membered N2O2S2 macrocycle incorporating two pyridine subunits (L) were prepared and structurally characterized. The individual complexes isolated exhibit unusual stoichiometries, geometries, oxidation states, and structural topologies and include an infinite mercurous complex and a heteronuclear dumbbell-shaped complex. Both the Zn(II) complex [Zn(L)][ZnBr4] (1) and the Cd(II) complex [Cd(L)Br2] (2) are mononuclear, with the metal ion located inside the macrocyclic cavity...
October 20, 2016: Inorganic Chemistry
Emanuel Carlos, Rita Branquinho, Asal Kiazadeh, Pedro Barquinha, Rodrigo Martins, Elvira Fortunato
Solution processing of amorphous metal oxides has been lately used as an option to implement in flexible electronics allowing a reduction of the associated costs and high performance. However the research has focused more on semiconductor layer rather than on the insulator layer that is related to the stability and performance of the devices. This work aims to evaluate amorphous aluminum oxide thin films produced by combustion synthesis and the influence of far ultraviolet (FUV) irradiation on properties of the insulator on thin film transistors (TFTs) using different semiconductors, in order to have compatibility with flexible substrates...
October 20, 2016: ACS Applied Materials & Interfaces
Xuexia He, WaiLeong Chow, Fucai Liu, BengKang Tay, Zheng Liu
2D transition metal dichalcogenides are promising channel materials for the next-generation electronic device. Here, vertically 2D heterostructures, so called van der Waals solids, are constructed using inorganic molybdenum sulfide (MoS2 ) few layers and organic crystal - 5,6,11,12-tetraphenylnaphthacene (rubrene). In this work, ambipolar field-effect transistors are successfully achieved based on MoS2 and rubrene crystals with the well balanced electron and hole mobilities of 1.27 and 0.36 cm(2) V(-1) s(-1) , respectively...
October 20, 2016: Small
Yingxiao Cai, Andreas Benischke, Paul Knochel, Corinne Gosmini
A simple and efficient protocol for the direct reductive cross-coupling between alkenyl and benzyl halides using a Co/Mn system has been developed. This reaction proceeds smoothly in the presence of [CoBr2(PPh3)2] as catalyst, with NaI as additive in acetonitrile with a broad scope of functionalized alkenyl and benzyl halides. Different functional groups are tolerated on both coupling partners, thus, significantly extending the general scope of transition-metal-catalyzed benzylation of alkenyl halides. Moderate to excellent yields were obtained...
October 20, 2016: Chemistry: a European Journal
D P Datta, V Siva, S Varma, D Kanjilal, P K Sahoo
A nanodot array morphology gradually develops on SiO2 surface when a thin bi-layer of Au and Si undergoes ion irradiation. An increasing amount of gold silicide is detected as islands on the insulator surface evolve into nanodots as a function of increasing ion fluence. Different stages of evolution from islands to nanodots are found to be driven by the localized melting of Au along the ion-track and dewetting of the metal film. Dewetting is accompanied by sputter-erosion and mixing of Au and Si at the bi-layer interface due to ion energy deposition...
October 20, 2016: Physical Chemistry Chemical Physics: PCCP
Fan Zhang, Yue Sun, Demei Tian, Weon Sup Shin, Jong Seung Kim, Haibing Li
Host-guest recognition plays an important role in biological analysis and biosensing. Accordingly, great efforts have been devoted to the development of sensors using versatile 3D surface materials. These functionalized nanomaterials possess the advantages of high selectivity and visual signals, enabling the selective detection of ions, amino acids, proteins, and other biological molecules. Therefore, in this feature article, we present some significant and representative examples of molecular recognition on calixarene functionalized 3D surface nanomaterials...
October 20, 2016: Chemical Communications: Chem Comm
Sven Dirkmann, Mirko Hansen, Martin Ziegler, Hermann Kohlstedt, Thomas Mussenbrock
In this work we report on the role of ion transport for the dynamic behavior of a double barrier quantum mechanical Al/Al2O3/NbxOy/Au memristive device based on numerical simulations in conjunction with experimental measurements. The device consists of an ultra-thin NbxOy solid state electrolyte between an Al2O3 tunnel barrier and a semiconductor metal interface at an Au electrode. It is shown that the device provides a number of interesting features such as an intrinsic current compliance, a relatively long retention time, and no need for an initialization step...
October 20, 2016: Scientific Reports
Andreas Brenneis, Felix Schade, Simon Drieschner, Florian Heimbach, Helmut Karl, Jose A Garrido, Alexander W Holleitner
For future on-chip communication schemes, it is essential to integrate nanoscale materials with an ultrafast optoelectronic functionality into high-frequency circuits. The atomically thin graphene has been widely demonstrated to be suitable for photovoltaic and optoelectronic devices because of its broadband optical absorption and its high electron mobility. Moreover, the ultrafast relaxation of photogenerated charge carriers has been verified in graphene. Here, we show that dual-gated graphene junctions can be functional parts of THz-circuits...
October 20, 2016: Scientific Reports
R Galceran, I Fina, J Cisneros-Fernández, B Bozzo, C Frontera, L López-Mir, H Deniz, K-W Park, B-G Park, Ll Balcells, X Martí, T Jungwirth, B Martínez
Antiferromagnetic spintronics is an emerging field; antiferromagnets can improve the functionalities of ferromagnets with higher response times, and having the information shielded against external magnetic field. Moreover, a large list of aniferromagnetic semiconductors and metals with Néel temperatures above room temperature exists. In the present manuscript, we persevere in the quest for the limits of how large can anisotropic magnetoresistance be in antiferromagnetic materials with very large spin-orbit coupling...
October 20, 2016: Scientific Reports
Zhen Li, Jintao Zhang, Buyuan Guan, Da Wang, Li-Min Liu, Xiong Wen David Lou
Lithium-sulfur batteries show advantages for next-generation electrical energy storage due to their high energy density and cost effectiveness. Enhancing the conductivity of the sulfur cathode and moderating the dissolution of lithium polysulfides are two key factors for the success of lithium-sulfur batteries. Here we report a sulfur host that overcomes both obstacles at once. With inherent metallic conductivity and strong adsorption capability for lithium-polysulfides, titanium monoxide@carbon hollow nanospheres can not only generate sufficient electrical contact to the insulating sulfur for high capacity, but also effectively confine lithium-polysulfides for prolonged cycle life...
October 20, 2016: Nature Communications
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