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https://www.readbyqxmd.com/read/28338266/accelerated-oxygen-atom-transfer-and-c-h-bond-oxygenation-by-remote-redox-changes-in-fe3-mn-iodosobenzene-adducts
#1
Graham de Ruiter, Kurtis M Carsch, Sheraz Gul, Ruchira Chatterjee, Niklas B Thompson, Michael K Takase, Junko Yano, Theodor Agapie
We report the synthesis, characterization, and reactivity of [LFe3 (PhPz)3 OMn((s) PhIO)][OTf]x (3: x=2; 4: x=3), where 4 is one of very few examples of iodosobenzene-metal adducts characterized by X-ray crystallography. Access to these rare heterometallic clusters enabled differentiation of the metal centers involved in oxygen atom transfer (Mn) or redox modulation (Fe). Specifically, (57) Fe Mössbauer and X-ray absorption spectroscopy provided unique insights into how changes in oxidation state (Fe(III)2 Fe(II) Mn(II) vs...
March 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28338182/microrna-199a-5p-mediates-high-glucose-induced-reactive-oxygen-species-production-and-apoptosis-in-ins-1-pancreatic-%C3%AE-cells-by-targeting-sirt1
#2
N Lin, X-Y Li, H-M Zhang, Z Yang, Q Su
OBJECTIVE: Hyperglycemia-induced pancreatic β-cell loss is a pathologic hallmark of type 2 diabetes mellitus (T2DM). This study was conducted to clarify the function of microRNA (miR)-199a-5p in high glucose-elicited β-cell toxicity and associated molecular mechanisms. MATERIALS AND METHODS: INS-1 rat pancreatic β-cells were cultured under normal (11 mM) or high (30 mM) glucose for 16-72 h and examined for miR-199a-5p expression. Gain and loss-of-function studies were performed to determine the role of miR-199a-5p in high glucose-induced apoptosis and reactive oxygen species (ROS) production...
March 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28338172/antidiabetic-drug-metformin-mitigates-ovarian-cancer-skov3-cell-growth-by-triggering-g2-m-cell-cycle-arrest-and-inhibition-of-m-tor-pi3k-akt-signaling-pathway
#3
Y-L Fu, Q-H Zhang, X-W Wang, H He
OBJECTIVE: Metformin is one of most extensively prescribed oral hypoglycemic drug and has received increased attention in recent times for its antitumorigenic potential. Many possible mechanisms have been proposed for the ability of metformin to overturn cancer growth in vitro and in vivo. The objective of the present study was to evaluate the anticancer activity of metformin against ovarian SKOV3 cancer cells. MATERIALS AND METHODS: Anticancer activity and IC50 value of metformin were determined by MTT assay...
March 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28336935/preservation-of-organic-matter-in-marine-sediments-by-inner-sphere-interactions-with-reactive-iron
#4
Andrew Barber, Jay Brandes, Alessandra Leri, Karine Lalonde, Kathryn Balind, Sue Wirick, Jian Wang, Yves Gélinas
Interactions between organic matter and mineral matrices are critical to the preservation of soil and sediment organic matter. In addition to clay minerals, Fe(III) oxides particles have recently been shown to be responsible for the protection and burial of a large fraction of sedimentary organic carbon (OC). Through a combination of synchrotron X-ray techniques and high-resolution images of intact sediment particles, we assessed the mechanism of interaction between OC and iron, as well as the composition of organic matter co-localized with ferric iron...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336897/three-dimensional-bioi-biox-x-cl-or-br-nanohybrids-for-enhanced-visible-light-photocatalytic-activity
#5
Yazi Liu, Jian Xu, Liqiong Wang, Huayang Zhang, Ping Xu, Xiaoguang Duan, Hongqi Sun, Shaobin Wang
Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption...
March 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336872/an-enzymatic-glucose-sensor-composed-of-carbon-coated-nano-tin-sulfide
#6
Ren-Jei Chung, An-Ni Wang, Shiuan-Ying Peng
In this study, a biosensor, based on a glucose oxidase (GOx) immobilized, carbon-coated tin sulfide (SnS) assembled on a glass carbon electrode (GCE) was developed, and its direct electrochemistry was investigated. The carbon coated SnS (C-SnS) nanoparticle was prepared through a simple two-step process, using hydrothermal and chemical vapor deposition methods. The large reactive surface area and unique electrical potential of C-SnS could offer a favorable microenvironment for facilitating electron transfer between enzymes and the electrode surface...
February 15, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336665/active-sites-for-co2-hydrogenation-to-methanol-on-cu-zno-catalysts
#7
Shyam Kattel, Pedro J Ramírez, Jingguang G Chen, José A Rodriguez, Ping Liu
The active sites over commercial copper/zinc oxide/aluminum oxide (Cu/ZnO/Al2O3) catalysts for carbon dioxide (CO2) hydrogenation to methanol, the Zn-Cu bimetallic sites or ZnO-Cu interfacial sites, have recently been the subject of intense debate. We report a direct comparison between the activity of ZnCu and ZnO/Cu model catalysts for methanol synthesis. By combining x-ray photoemission spectroscopy, density functional theory, and kinetic Monte Carlo simulations, we can identify and characterize the reactivity of each catalyst...
March 24, 2017: Science
https://www.readbyqxmd.com/read/28335307/zinc-oxide-nanorods-decorated-graphene-nanoplatelets-a-promising-antimicrobial-agent-against-the-cariogenic-bacterium-streptococcus-mutans
#8
Elena Zanni, Chandrakanth Reddy Chandraiahgari, Giovanni De Bellis, Maria Rita Montereali, Giovanna Armiento, Paolo Ballirano, Antonella Polimeni, Maria Sabrina Sarto, Daniela Uccelletti
Nanomaterials are revolutionizing the field of medicine to improve the quality of life due to the myriad of applications stemming from their unique properties, including the antimicrobial activity against pathogens. In this study, the antimicrobial and antibiofilm properties of a novel nanomaterial composed by zinc oxide nanorods-decorated graphene nanoplatelets (ZNGs) are investigated. ZNGs were produced by hydrothermal method and characterized through field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) techniques...
September 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334480/zirconacyclopentadiene-annulated-polycyclic-aromatic-hydrocarbons
#9
Gavin R Kiel, Micah S Ziegler, T Don Tilley
Syntheses of large polycyclic aromatic hydrocarbons (PAHs) and graphene nanostructures demand methods that are capable of selectively and efficiently fusing large numbers of aromatic rings, yet such methods remain scarce. Herein, we report a new approach that is based on the quantitative intramolecular reductive cyclization of an oligo(diyne) with a low-valent zirconocene reagent, which gives a PAH with one or more annulated zirconacyclopentadienes (ZrPAHs). The efficiency of this process is demonstrated by a high-yielding fivefold intramolecular coupling to form a helical ZrPAH with 16 fused rings (from a precursor with no fused rings)...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28334455/ceric-cyclopentadienides-bearing-alkoxy-aryloxy-chlorido-or-iodido-co-ligands
#10
Reiner Anwander, David Schneider, Frank Edelmann, Nicole Harmgarth
A series of heteroleptic tris(cyclopentadienyl) CeIV complexes has been isolated and crystallographically characterized, implying a broad accessibility of such organocerium(IV) compounds. The oxidation of complexes CpMe3Ce(thf) and Cp'3Ce(thf) (CpMe = C5H4Me, Cp' = C5H4SiMe3), bearing monosubstituted electron-poor cyclopentadienyl ligands, with either 0.5 equiv. 1,4-benzoquinone or C2Cl6 gave the cerium(IV) hydroquinolate and chloride complexes CpMe3Ce(OC6H4O)CeCpMe3, Cp'3Ce(OC6H4O)CeCp'3, as well as CpMe3CeCl and Cp'3CeCl, respectively...
March 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28333055/enhanced-adsorption-removal-of-anionic-dyes-via-a-facile-preparation-of-amino-functionalized-magnetic-silica
#11
Xiao-Shui Li, Yu-Han Fan, Shou-Wen Zhang, Shi-Hua Qi
A novel amino-functionalized magnetic silica (Fe3O4@SiO2-NH2) was easily prepared via a one-step method integrating the immobilization of 3-aminopropyltriethoxysilane with a sol-gel process of tetraethyl orthosilicate into a single process. This showed significant improvement in the adsorption capacity of anionic dyes. The product (Fe3O4@SiO2-NH2) was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, zeta potential and vibrating sample magnetometry...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332864/effect-of-density-gradient-centrifugation-on-reactive-oxygen-species-in-human-semen
#12
Teppei Takeshima, Yasushi Yumura, Shinnosuke Kuroda, Takashi Kawahara, Hiroji Uemura, Akira Iwasaki
Density gradient centrifugation can separate motile sperm from immotile sperm and other cells for assisted reproduction, but may also remove antioxidants from seminal plasma, resulting in oxidative stress. Therefore, we investigated reactive oxygen species (ROS) concentrations and distribution in semen before and after density gradient centrifugation. We assessed semen volume, sperm concentration, sperm motility, and ROS levels before and after density gradient centrifugation (300 x g for 20 minutes) in 143 semen samples from 118 patients...
March 23, 2017: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/28332333/allo-hla-cross-reactivities-of-cmv-flu-and-vzv-specific-memory-t-cells-are-shared-by-different-individuals
#13
H van den Heuvel, K M Heutinck, E M W van der Meer-Prins, S L Yong, P P M C van Miert, J D H Anholts, M E I Franke-van Dijk, X Q Zhang, D L Roelen, R J M Ten Berge, F H J Claas
Virus-specific T cells can recognize allogeneic HLA (allo-HLA) through TCR cross-reactivity. The allospecificity often differs per individual ("private cross-reactivity"), but can also be shared by multiple individuals ("public cross-reactivity"). However, only a few examples of the latter have been described. Since these could facilitate alloreactivity prediction in transplantation, we aimed to identify novel public cross-reactivities of human virus-specific CD8+ T cells directed against allo-HLA by assessing their reactivity in mixed-lymphocyte reactions...
March 23, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28331234/effect-of-vertically-oriented-few-layer-graphene-on-the-wettability-and-interfacial-reactions-of-the-agcuti-sio2f-sio2-system
#14
Z Sun, L X Zhang, J L Qi, Z H Zhang, T D Hao, J C Feng
With the aim of expanding their applications, particularly when joining metals, a simple but effective method is reported whereby the surface chemical reactivity of SiO2f/SiO2 (SiO2f/SiO2 stands for silica fibre reinforced silica based composite materials and f is short for fibre) composites with vertically oriented few-layer graphene (VFG, 3-10 atomic layers of graphene vertically oriented to the substrate) can be tailored. VFG was uniformly grown on the surface of a SiO2f/SiO2 composite by using plasma enhanced chemical vapour deposition (PECVD)...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28330316/phytotoxicity-and-oxidative-stress-perspective-of-two-selected-nanoparticles-in-brassica-juncea
#15
Sunita Rao, Gyan Singh Shekhawat
This study elaborates the consequences of oxidative stress caused by copper oxide (CuO) and titanium dioxide (TiO2) nanoparticles (NPs) in Brassica juncea. Effect of these two NPs on plant physiology, reactive oxygen scavenging enzyme system (ascorbate peroxidase, catalase, superoxide dismutase), proline content and lipid peroxidation has been estimated in leaves as well as root tissues. Bioaccumulation of NPs has also been evaluated in the current study and the interrelated cascade of the enzymatic system with H2O2 production was identified...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329274/trichinella-nativa-outbreak-with-rare-thrombotic-complications-associated-with-meat-from-a-black-bear-hunted-in-northern-ontario
#16
Daniel Dalcin, Dante S Zarlenga, Nicholas C Larter, Eric Hoberg, Daniel A Boucher, Samuel Merrifield, Rachel Lau, Filip Ralevski, Karamjit Cheema, Kevin L Schwartz, Andrea K Boggild
Background: Although trichinellosis is known to cause thrombotic disease, serious thrombotic events are rare and have not been previously associated with Trichinella nativa infection. Methods: Patient interviews and medical chart reviews were conducted on 10 men who became ill following consumption of a common source of black bear meat. Trichinella serology on patient sera as well as PCR and larval identification of the meat samples was conducted. Results: All 10 exposed individuals developed an acute illness clinically compatible with trichinellosis, characterized by fever, abdominal pain, and diarrhea, along with eosinophilia ranging from 0...
February 22, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28328112/an-isolable-potassium-salt-of-a-borasilene-chloride-adduct
#17
Yuko Suzuki, Shintaro Ishida, Sota Sato, Hiroyuki Isobe, Takeaki Iwamoto
Among the variety of isolable compounds with multiple bonds involving silicon, examples of compounds that contain silicon-boron double bonds (borasilenes) still remain relatively rare. Herein, we report the synthesis of the potassium salt of a chloride adduct of borasilene 1 ([2](-) ), which was obtained as an orange crystalline solid. Single-crystal X-ray diffraction analysis and reactivity studies on [2](-) confirmed the double-bond character of the Si=B bond as well as the reduced Lewis acidity, which is due to the coordination of Cl(-) to the boron center...
March 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28327749/mono-and-polynuclear-ag-i-complexes-of-n-functionalized-bis-diphenylphosphino-amine-dppa-type-ligands-synthesis-solid-state-structures-and-reactivity
#18
Alessio Ghisolfi, Christophe Fliedel, Pierre de Frémont, Pierre Braunstein
The reactivity of the N-functionalized DPPA-type ligands (Ph2P)2N(p-Z)C6H4 [Z = H (1a), SMe (1b), OMe (1c)] with AgBF4 was investigated and revealed an unexpected influence of the para substituent Z of the N-aryl ligand. In acetone, the mononuclear bis-chelated [Ag{(1a-1c)-P,P}2]BF4 (2a·BF4-2c·BF4) and dinuclear bridged [Ag2{μ2-(1a-1c)-P,P}2](BF4)2 [3a·(BF4)2-3c·(BF4)2] complexes were obtained with a 1 : 2 and 1 : 1 AgBF4/ligand molar ratio, respectively. While the molecular structures of 2a·BF4 and 2b·BF4 determined in the solid-state by X-ray diffraction revealed their mononuclear nature and the absence of cation/anion interaction, complexes 3b·(BF4)2 and 3c·(BF4)2 form 2D coordination polymers through intermolecular Ag-S or Ag-O interactions, respectively, involving the N-function of the respective DPPA-type ligand, and display direct interactions between one BF4 anion and both Ag(i) cations...
March 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28327708/facile-embedding-of-single-vanadium-atoms-at-the-anatase-tio2-101-surface
#19
Stig Koust, Logi Arnarson, Poul G Moses, Zheshen Li, Igor Beinik, Jeppe V Lauritsen, Stefan Wendt
To understand the structure-reactivity relationships for mixed-metal oxide catalysts, well-defined systems are required. Mixtures of vanadia and titania (TiO2) are of particular interest for application in heterogeneous catalysis, with TiO2 often acting as the support. By utilizing high-resolution scanning tunneling microscopy, we studied the interaction of vanadium (V) with the anatase TiO2(101) surface in the sub-monolayer regime. At 80 K, metallic V nucleates into homogeneously distributed clusters onto the terraces with no preference for nucleation at the step edges...
March 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28326638/intervertebral-disc-calcification-with-ossification-of-the-posterior-longitudinal-ligament
#20
Kaori Mizukawa, Takako Kobayashi, Nobuharu Yamada, Takahisa Hirota
A 6-year-old girl presented to hospital with a 4 day history of increasing neck pain. White blood cell count was normal with slightly raised C-reactive protein. The patient had a limited range of neck movement, and experienced enhanced pain with neck extension. X-ray and cervical computed tomography (CT) confirmed the diagnosis of cervical intervertebral disc calcification (IDC) and IDC with ossification of the posterior longitudinal ligament (OPLL), respectively. The symptoms improved after approximately 1 week following rest and oral acetaminophen...
March 21, 2017: Pediatrics International: Official Journal of the Japan Pediatric Society
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