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https://www.readbyqxmd.com/read/28212040/synthesis-and-speciation-dependent-properties-of-a-multimetallic-model-complex-of-nisod-that-exhibits-unique-hydrogen-bonding
#1
Ramsey A Steiner, Stephen P Dzul, Timothy L Stemmler, Todd C Harrop
The complex Na3[{Ni(II)(nmp)}3S3BTA(alk))] (1) (nmp(2-) = deprotonated form of N-(2-mercaptoethyl)picolinamide; H3S3BTA(alk) = N(1),N(3),N(5)-tris(2-mercaptoethyl)benzene-1,3,5-tricarboxamide, where H = dissociable protons), supported by the thiolate-benzenetricarboxamide scaffold (S3BTA(alk)), has been synthesized as a trimetallic model of nickel-containing superoxide dismutase (NiSOD). X-ray absorption spectroscopy (XAS) and (1)H NMR measurements on 1 indicate that the Ni(II) centers are square-planar with N2S2 coordination, and Ni-N and Ni-S distances of 1...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28160861/antibacterial-activity-of-epigallocatechin-3-gallate-egcg-and-its-synergism-with-%C3%AE-lactam-antibiotics-sensitizing-carbapenem-associated-multidrug-resistant-clinical-isolates-of-acinetobacter-baumannii
#2
Spencer Lee, Ghaida Saleh Al Razqan, Dong H Kwon
BACKGROUND: Infections caused by Acinetobacter baumannii were responsive to conventional antibiotic therapy. However, recently, carbapenem-associated multidrug resistant isolates have been reported worldwide and present a major therapeutic challenge. Epigallocatechin-3-Gallate (EGCG) extracted from green tea exhibits antibacterial activity. PURPOSE: We evaluated the antibacterial activity of EGCG and possible synergism with antibiotics in carbapenem-associated multidrug resistant A...
January 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28160854/the-anti-inflammatory-effects-of-n-methyl-2s-4r-trans-4-hydroxy-l-proline-from-syderoxylon-obtusifolium-are-related-to-its-inhibition-of-tnf-alpha-and-inflammatory-enzymes
#3
Pedro Everson Alexandre de Aquino, Talita Rocha Magalhães, Lucas Antônio Duarte Nicolau, Luzia Kalyne A Moreira Leal, Nayara Coriolano de Aquino, Sabrina Matias Dos Santos, Kelly Rose Tavares Neves, Edilberto Rocha Silveira, Glauce Socorro de Barros Viana
BACKGROUND: Sideroxylon obtusifolium (Roem. & Schult.) T.D. Penn., Sapotaceae family, is a medicinal species native to the Brazilian Northeastern region. The plant is popularly used as an anti-inflammatory and hypoglycemic. PURPOSE: To evaluate the anti-inflammatory properties of the N-methyl-(2S,4R)-trans-4-hydroxy-l-proline (NMP) from S. obtusifolium leaves in models of inflammation and to clarify its action mechanisms. METHODS: Male Swiss mice were distributed intocontrols and groups treated with NMP (25, 50 and 100mg/kg, p...
January 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28155882/development-of-a-nanocomposite-ultrafiltration-membrane-based-on-polyphenylsulfone-blended-with-graphene-oxide
#4
Arun Kumar Shukla, Javed Alam, Mansour Alhoshan, Lawrence Arockiasamy Dass, M R Muthumareeswaran
In the present study, graphene oxide (GO) was incorporated as a nanoadditive into a polyphenylsulfone (PPSU) to develop a PPSU/GO nanocomposite membrane with enhanced antifouling properties. A series of membranes containing different concentrations (0.2, 0.5 and 1.0 wt.%) of GO were fabricated via the phase inversion method, using N-methyl pyrrolidone (NMP) as the solvent, deionized water as the non-solvent, and polyvinylpyrrolidone (PVP) as a pore forming agent. The prepared nanocomposite membranes were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM), and were also characterized with respect to contact angle, zeta potential and porosity, mean pore radius, tortuosity and molecular weight cut-off (MWCO)...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28108923/adsorption-of-nickel-ions-by-oleate-modified-magnetic-iron-oxide-nanoparticles
#5
Cécilia Magnet, Claire Lomenech, Charlotte Hurel, Pierre Reilhac, Françoise Giulieri, Anne-Marie Chaze, Jacques Persello, Pavel Kuzhir
In this work, magnetic nanoparticles of iron oxide (MNPs) were synthesized, and then the surface was recovered with an oleate double layer in order to investigate the ability of this material to adsorb nickel ions. First, the solution chemistry of oleate ions was investigated in order to determine the critical micellar concentration (CMC) value and the arrangements of ions above the CMC. Then, the synthesized oleate-modified MNP was characterized (TEM, DLS, XRD, FTIR, zeta potential, magnetometry). Finally, adsorption experiments were carried out as a function of pH and as a function of nickel concentration in 0...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28073412/-clinical-effect-of-ultrasound-guided-injection-of-biodegradable-poly-lactic-co-glycolic-acid-fe3o4-in-situ-implant-for-magnetic-thermal-ablation-in-treatment-of-nude-mice-with-human-liver-cancer-smmc-7721-cells
#6
B Liang, G Q Zuo, Y Y Zheng, S He, D Y Zuo
Objective: To prepare the Fe3O4-loaded biodegradable liquid-solid phase inversion poly(lactic-co-glycolic acid) (PLGA) in situ implant for ultrasound-guided injection into nude mouse tumor model, and to investigate its clinical effect in thermomagnetic treatment of nude mice with human liver cancer SMMC-7721 cells in an alternating magnetic field. Methods: An in situ implant containing 10% Fe3O4 was prepared, and 50 μl Fe3O4-PLGA-NMP gel was injected into the subcutaneous tissue of Kunming mice. The degradation of this material was observed for 2 consecutive months, and the changes in body weight were recorded...
December 20, 2016: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/28060503/coordination-polymers-and-cage-containing-frameworks-in-uranyl-ion-complexes-with-rac-and-1r-2r-trans-1-2-cyclohexanedicarboxylates-consequences-of-chirality
#7
Pierre Thuéry, Jack Harrowfield
Racemic and enantiopure (1R,2R) forms of trans-1,2-cyclohexanedicarboxylic acid (H2chdc and R-H2chdc, respectively) have been used in the synthesis of a series of 13 uranyl ion complexes, all obtained under solvo-hydrothermal conditions and in the presence of additional metal cations and/or N-donor ligands. While the homometallic complex [UO2(R-chdc)] (1) was only obtained with the enantiopure ligand, complexes [UO2(chdc)(THF)] (2), [UO2(chdc)(DMF)] (3), and [UO2(chdc)(NMP)] (4), with a coordinated solvent molecule, were obtained from the racemic form only; all crystallize as two-dimensional (2D) assemblies...
January 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28060486/highly-porous-rigid-rod-polyamide-aerogels-with-superior-mechanical-properties-and-unusually-high-thermal-conductivity
#8
Jarrod C Williams, Baochau N Nguyen, Linda McCorkle, Daniel Scheiman, Justin S Griffin, Stephen A Steiner, Mary Ann B Meador
We report here the fabrication of polyamide aerogels composed of poly-p-phenylene-terephthalamide, the same backbone chemistry as DuPont's Kevlar. The all-para-substituted polymers gel without the use of cross-linker and maintain their shape during processing-an improvement over the meta-substituted cross-linked polyamide aerogels reported previously. Solutions containing calcium chloride (CaCl2) and para-phenylenediamine (pPDA) in N-methylpyrrolidinone (NMP) at low temperature are reacted with terephthaloyl chloride (TPC)...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28026824/nuclear-matrix-structure-function-and-pathogenesis
#9
Piotr Wasąg, Robert Lenartowski
The nuclear matrix (NM), or nuclear skeleton, is the non-chromatin, ribonucleoproteinaceous framework that is resistant to high ionic strength buffers, nonionic detergents, and nucleolytic enzymes. The NM fulfills a structural role in eukaryotic cells and is responsible for maintaining the shape of the nucleus and the spatial organization of chromatin. Moreover, the NM participates in several cellular processes, such as DNA replication/repair, gene expression, RNA transport, cell signaling and differentiation, cell cycle regulation, apoptosis and carcinogenesis...
December 20, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28024586/microstructural-control-of-modular-peptide-release-from-microporous-biphasic-calcium-phosphate
#10
Samantha J Polak, Jae Sung Lee, William L Murphy, Solène Tadier, Laurent Grémillard, Ian V Lightcap, Amy J Wagoner Johnson
Drug release from tissue scaffolds is commonly controlled by using coatings and carriers, as well as by varying the binding affinity of molecules being released. This paper considers modulating synthetic peptide incorporation and release through the use of interconnected microporosity in biphasic calcium phosphate (BCP) and identifies the microstructural characteristics important to the release using experiments and a model of relative diffusivity. First, the release of three modular peptides designed to include an osteocalcin-inspired binding sequence based on bone morphogenic protein-2 (BMP-2) was compared and one was selected for further study...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024344/modifying-the-size-of-ultrasound-induced-liquid-phase-exfoliated-graphene-from-nanosheets-to-nanodots
#11
Artur Ciesielski, Sébastien Haar, Alessandro Aliprandi, Mohamed El Garah, Giulia Tregnago, Giovanni F Cotella, Mirella El Gemayel, Fanny Richard, Haiyan Sun, Franco Cacialli, Francesco Bonaccorso, Paolo Samorì
Ultrasound-induced liquid-phase exfoliation (UILPE) is an established method to produce single- (SLG) and few-layer (FLG) graphene nanosheets starting from graphite as a precursor. In this paper we investigate the effect of the ultrasonication power in the UILPE process carried out in either N-methyl-2-pyrrolidone (NMP) or ortho-dichlorobenzene (o-DCB). Our experimental results reveal that while the SLGs/FLGs concentration of the NMP dispersions is independent of the power of the ultrasonic bath during the UILPE process, in o-DCB it decreases as the ultrasonication power increases...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28004362/contribution-of-target-alteration-protection-and-efflux-pump-in-achieving-high-ciprofloxacin-resistance-in-enterobacteriaceae
#12
Ram Prosad Chakrabarty, Munawar Sultana, Saadlee Shehreen, Selina Akter, M Anwar Hossain
The study aims at revealing the comprehensive contribution of target alteration, target protection and efflux pump to the development of high level of ciprofloxacin (CIP) resistance in Enterobacteriaceae bacteria of environmental, clinical and poultry origins. Antibiotic susceptibility test was used to detect CIP resistant (CIPR) isolates and MICCIP was determined by broth microdilution method. The presence of qnrS gene was identified by PCR and Southern blot hybridization (SBH) confirmed their location. Checkerboard titration demonstrated the effect of NMP on CIP action...
December 2016: AMB Express
https://www.readbyqxmd.com/read/27958753/orthogonally-processable-carbazole-based-polymer-thin-films-by-nitroxide-mediated-polymerization
#13
Owen A Melville, Benjamin King, Christian Imperiale, Benoît H Lessard
Cross-linking of hole-transporting polymer thin films in organic light emitting diodes (OLEDs) has been shown to increase device efficacy when subsequent layers are deposited from solution. This improvement, due to resistance of the films to dissolution, could also be achieved by covalently grafting the polymer film to the substrate. Using nitroxide-mediated polymerization (NMP), we synthesized a novel poly(9-(4-vinylbenzyl)-9H-carbazole) (poly(VBK)) copolymer which can be cross-linked and also developed two simple methods for the grafting-to or grafting-from, also known as surface-initiated polymerization, of poly(VBK) to indium tin oxide (ITO) substrates...
December 27, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27942651/ternary-solvent-for-ch3nh3pbi3-perovskite-films-with-uniform-domain-size
#14
Lin Xie, Heewon Hwang, Minjung Kim, Kyungkon Kim
A ternary solvent system consisting of dimethyl sulfoxide (DMSO), γ-butyrolactone (GBL) and N-methyl-2-pyrrolidone (NMP) has been developed to improve the uniformity of CH3NH3PbI3 (MAPbI3) perovskite domains. Compared to MAPbI3 perovskite films prepared using a binary solvent consisting of DMSO and GBL, the surface roughness and uniformity of MAPbI3 films fabricated by using the ternary solvent system are greatly improved. The thermogravimetric analysis reveals that a NMP-PbI2-MAI intermediate, a DMSO-PbI2-MAI intermediate and MAPbI3 crystals co-existed in the as-cast MAPbI3 films...
January 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27941468/liver-perfusion-devices-how-close-are-we-to-widespread-application
#15
Amelia J Hessheimer, Constantino Fondevila
PURPOSE OF REVIEW: Ex-situ liver machine perfusion has been the focus of increasing interest over the past decade as a means to improve the quality of livers for transplantation and the applicability of liver transplantation in general. The present review aims to evaluate the experimental basis for liver machine perfusion and the significance of recent reports on its clinical application. RECENT FINDINGS: Although liver machine perfusion has been studied experimentally over a range of temperatures, clinical liver transplant work that has been performed to date has been done using either hypothermic machine perfusion (0-12 °C), HMP or normothermic machine perfusion (35-38 °C, NMP)...
December 9, 2016: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/27941437/activation-of-fibrinolysis-but-not-coagulation-during-end-ischemic-ex-situ-normothermic-machine-perfusion-of-human-donor-livers
#16
Shanice A Karangwa, Laura C Burlage, Jelle Adelmeijer, Negin Karimian, Andrie C Westerkamp, Alix P Matton, Rianne van Rijn, Janneke Wiersema-Buist, Micheal E Sutton, Sanna Op den Dries, Ton Lisman, Robert J Porte
BACKGROUND: Ex situ normothermic machine perfusion (NMP) can be performed after traditional static cold preservation to assess graft function and viability before transplantation. It is unknown whether this results in activation of coagulation and fibrinolysis, as may occur upon graft reperfusion in vivo. METHODS: Twelve donor livers declined for transplantation underwent 6 hours of end-ischemic NMP using a heparinized plasma-based perfusion fluid. Concentration of prothrombin fragment F1 + 2 (marker of coagulation activation), D-dimer, plasmin-antiplasmin complex, tissue plasminogen activator and plasminogen activator inhibitor-1 (markers for fibrinolysis) and alanine aminotransferase (ALT) (marker of ischemia-reperfusion [I/R] injury) were measured in perfusion fluid at regular intervals...
February 2017: Transplantation
https://www.readbyqxmd.com/read/27934983/syntheses-structures-and-magnetic-properties-of-nine-coordination-polymers-based-on-terphenyl-tetracarboxylic-acid-ligands
#17
Xinhui Zhou, Qianqian Chen, Baolin Liu, Liang Li, Tao Yang, Wei Huang
Nine coordination polymers (CPs) [Mn(H3L)(H2L)0.5(phen)]n (1), [Ni2L(phen)2(μ2-H2O)]n (2), {[Mn2L(phen)2]·(DMA)(H2O)}n (3), {[Co2L(μ2-H2O)(μ2-DMA)]·DMF}n (4), [CoL0.5(H2O)(phen)]n (5), {[Ni2L(μ2-H2O)(μ2-DMA)]·DMA}n (6), {[Co2L(μ2-H2O)(μ2-DMA)]·DMA}n (7), {[Ni2L(μ2-H2O)(H2O)2(DMF)2]·(H2O)2(DMF)}n (8), and {[Ni4L2(μ2-H2O)4(H2O)2]·(H2O)2(NMP)}n (9) (H4L = 1,1':4',1''-terphenyl-2',4,4'',5'-tetracarboxylic acid, DMA = N,N-dimethylacetamine, DMF = N,N-dimethylformamide, NMP = N-methyl-2-pyrrolidone, phen = 1,10-phenanthroline) have been synthesized and structurally characterized...
January 3, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27934056/liquid-phase-exfoliation-of-mos2-nanosheets-the-critical-role-of-trace-water
#18
Amit Gupta, Vaishali Arunachalam, Sukumaran Vasudevan
Sonication-assisted liquid-phase exfoliation of layered materials in suitable organic solvents offers a simple scalable route for the production of 2D nanomaterials. N-methyl-2-pyrrolidone (NMP) is one of the most efficient solvents for liquid-phase exfoliation of a variety of layered solids, including MoS2. We show here that trace water present in NMP is crucial for the stability of MoS2 nanosheets in NMP dispersions. In the absence of water, the sheets are fragmented and chemically unstable. Using solution NMR techniques, 2D nuclear Overhauser effect and spin-lattice relaxation measurements, supported by classical molecular dynamics simulations, we are able to establish the role of water molecules in stabilizing the dispersion...
December 1, 2016: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/27914867/new-hbm-values-for-emerging-substances-inventory-of-reference-and-hbm-values-in-force-and-working-principles-of-the-german-human-biomonitoring-commission
#19
REVIEW
Petra Apel, Jürgen Angerer, Michael Wilhelm, Marike Kolossa-Gehring
The German Human Biomonitoring Commission (HBM Commission) derives health-related guidance values (Human Biomonitoring assessment values, HBM values) according to the procedures described in the HBM Commission's position papers. Since the last adaption of the methodology in 2014, the HBM Commission has established a series of new HBM values, mainly on the basis of internationally agreed TDI/RfD values, or of toxicologically well- founded points of departure observed in animal studies. The derivation of these new HBM values for HBCDD, triclosan, 2-MBT, PFOA and PFOS as well as for the metabolites of glycol ethers, of Hexamoll(®) DINCH(®), DPHP, DEHTP, NMP, NEP, and 4-MBC is specified, and the HBM values are presented together with already established HBM values for other substances...
September 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27847875/all-printed-magnetically-self-healing-electrochemical-devices
#20
Amay J Bandodkar, Cristian S López, Allibai Mohanan Vinu Mohan, Lu Yin, Rajan Kumar, Joseph Wang
The present work demonstrates the synthesis and application of permanent magnetic Nd2Fe14B microparticle (NMP)-loaded graphitic inks for realizing rapidly self-healing inexpensive printed electrochemical devices. The incorporation of NMPs into the printable ink imparts impressive self-healing ability to the printed conducting trace, with rapid (~50 ms) recovery of repeated large (3 mm) damages at the same or different locations without any user intervention or external trigger. The permanent and surrounding-insensitive magnetic properties of the NMPs thus result in long-lasting ability to repair extreme levels of damage, independent of ambient conditions...
November 2016: Science Advances
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