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https://www.readbyqxmd.com/read/28324643/unsymmetrical-iron-p-nh-p-catalysts-for-the-asymmetric-pressure-hydrogenation-of-aryl-ketones
#1
Robert Harold Morris, Samantha Alizabeth Michelle Smith, Paraskevi Olympia Lagaditis, Alan J Lough, Anne Lüpke
The reductive amination of -dialkylphosphine acetaldehydes with enantiopure -aminophosphines is a new, versatile route to unsymmetrical tridentate (pincer) ligands P-NH-P'. Four new ligands PR2CH2CH2NHCHR'CHR''PPh2 (R = iPr, Cy, R' = Ph, CH(CH3)2, R'' = Ph, H) prepared in this way are used to make the iron(II) complexes mer-FeCl2(CO)(P-NH-P') and mer-FeCl(H)(CO)(P-NH-P'). The hydride complex with the rigid ligand with R'= R''= Ph is an efficient and highly enantioselective homogeneous asymmetric pressure hydrogenation (APH) catalyst...
March 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28318946/easy-and-rapid-preparation-of-benzoylhydrazides-and-their-diazene-derivatives-as-inhibitors-of-15-lipoxygenase
#2
Cristian Tirapegui, Williams Acevedo-Fuentes, Pablo Dahech, Claudia Torrent, Pablo Barrias, Macarena Rojas-Poblete, Carolina Mascayano
Two series of diaza derivatives were prepared by solvent-free condensation of benzoic acid and 4-substituted phenylhydrazines in order to obtain phenylhydrazides (HYD series) and, by oxidation of these compounds, the corresponding benzoyldiazenes (DIA series). Both sets were evaluated as inhibitors of soybean 15-lipoxygenase activity and antioxidant capability in the FRAP and CUPRAC assays. The most potent inhibitors of both series exhibited IC50 values in the low micromolar range. Kinetic studies showed that at least the more active compounds were competitive inhibitors...
March 8, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28315492/long-term-in-vivo-corrosion-behavior-biocompatibility-and-bioresorption-mechanism-of-a-bioresorbable-nitrided-iron-scaffold
#3
Wenjiao Lin, Li Qin, Haiping Qi, Deyuan Zhang, Gui Zhang, Runlin Gao, Hong Qiu, Ying Xia, Ping Cao, Xiang Wang, Wei Zheng
Pure iron as a potential bioresorbable material for bioresorbable coronary scaffold has major disadvantages of slow corrosion and bioresorption. However, so far, there are neither quantitative data of long-term in vivo corrosion nor direct experimental evidence for bioresorption of pure iron and its alloys, which are fundamental and vital for developing novel Fe-based alloys overcoming the intrinsic drawbacks of pure iron. This work systemically investigated scaffold performance, long-term in vivo corrosion behavior and biocompatibility of a nitrided iron coronary scaffold and explored its bioresorption mechanism...
March 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28299243/analysis-of-free-legal-counselling-for-the-great-east-japan-earthquake-and-the-outlook-for-the-field-of-disaster-recovery-and-revitalization-law
#4
REVIEW
Tadashi Okamoto
Of the free legal counselling conducted by lawyers following the Great East Japan Earthquake, the results of analysis of approx. 40,000 cases have been disclosed by the Japan Federation of Bar Associations. These analysis results have been used as evidence serving as the basis for system revision and new legislation following the disaster, and have been of value to public policy, to a certain extent. In order to identify methods for realizing policy targets as know-how for public policy through the integration and analysis of legal needs in disaster areas, in FY2012 and thereafter, lectures on the "Disaster Recovery and Revitalization Law" were initiated by the Graduate School of Public Policy, Chuo University; Keio University Law School; and other institutions...
September 2016: Japan Medical Association Journal: JMAJ
https://www.readbyqxmd.com/read/28296133/iron-based-electrodes-meet-water-based-preparation-fluorine-free-electrolyte-and-binder-a-chance-for-more-sustainable-li-ion-batteries
#5
Mario Valvo, Anti Liivat, Henrik Eriksson, Cheuk-Wai Tai, Kristina Edström
Environmentally friendly and cost-effective Li-ion cells are fabricated with abundant, non-toxic LiFePO4 cathodes and Fe oxide anodes. A water-soluble alginate binder is used for coating both electrodes to reduce the environmental footprint. Critical reactivity of LiPF6-based electrolytes toward possible H2O traces in water-processed electrodes is overcome by using a LiBOB salt. The absence of fluorine in both electrolyte and binder is a cornerstone for improved cell chemistry and is demonstrated to result in stable battery operation...
March 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28294059/phytochemical-screening-alpha-glucosidase-inhibition-antibacterial-and-antioxidant-potential-of-ajuga-bracteosa-extracts
#6
Kokab Hafeez, Saiqa Andleeb, Tahseen Ghousa, Kalsoom Akhter
BACKGROUND: Ajuga bracteosa, a medicinal herb, used by local community to cure a number of diseases such as inflammation, jaundice bronchial asthma, cancer and diabetes. OBJECTIVES: The aim of present work was to evaluate the antioxidant potential, in vitro antidiabetic and antimicrobial effects of A. bracteosa. METHODS: n-hexane, ethyl acetate, chloroform, acetone, methanol and aqueous extracts of Ajuga bracteosa roots, were prepared via maceration...
March 12, 2017: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/28292181/synthesis-structure-characterization-and-evaluation-in-microglia-cultures-of-neuromelanin-analogues-suitable-for-modeling-parkinson-s-disease
#7
Emanuele Ferrari, Andrea Capucciati, Ilaria Prada, Fabio Andrea Zucca, Giulia D'Arrigo, Daniele Pontiroli, Maria Grazia Bridelli, Michela Sturini, Luigi Bubacco, Enrico Monzani, Claudia Verderio, Luigi Zecca, Luigi Casella
In the substantia nigra of human brain, neuromelanin (NM) released by degenerating neurons can activate microglia with consequent neurodegeneration, typical of Parkinson's disease (PD). Synthetic analogues of NM were prepared to develop a PD model reproducing the neuropathological conditions of the disease. Soluble melanin-protein conjugates were obtained by melanization of fibrillated β-lactoglobulin (fLG). The melanic portion of the conjugates contains either eumelanic (EufLG) or mixed eumelanic/pheomelanic composition (PheofLG), the latter better simulating natural NMs...
March 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28285915/adamantyl-and-other-polycyclic-cage-based-conjugates-of-desferrioxamine-b-dfob-for-treating-iron-mediated-toxicity-in-cell-models-of-parkinson-s-disease
#8
Thomas J Telfer, Jeffrey R Liddell, Clare Duncan, Anthony R White, Rachel Codd
The death of dopaminergic neurons is a major pathological hallmark of Parkinson's disease (PD). Elevated iron within the substantia nigra of the PD brain is thought to catalyze this neuronal death through hydroxyl radical-derived oxidative damage. Removing this excess iron presents a potential therapeutic strategy for PD. Seventeen derivatives of the non-toxic iron chelator desferrioxamine B (DFOB) were prepared by the conjugation of adamantyl- (1-4, 8-12), deconstructed adamantyl units (5-7), norborna(e)ne- (13-16) or bicyclo[2...
March 2, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28284639/transport-behavior-of-the-pharmaceutical-compounds-carbamazepine-sulfamethoxazole-gemfibrozil-ibuprofen-and-naproxen-and-the-lifestyle-drug-caffeine-in-saturated-laboratory-columns
#9
Klaus H Hebig, Laura G Groza, Michelle J Sabourin, Traugott J Scheytt, Carol J Ptacek
Despite the large number of pharmaceutically active compounds found in natural environments little is known about their transport behavior in groundwater, which is complicated by their wide range of physical and chemical properties. The transport behavior of five widely used and often detected pharmaceutical compounds and one lifestyle drug has therefore been investigated, using a set of three column experiments. The investigated compounds were the anticonvulsant carbamazepine, the lifestyle drug caffeine, the antibiotic sulfamethoxazole, the lipid regulator gemfibrozil, and the nonsteroidal anti-inflammatories ibuprofen and naproxen...
March 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28281077/iron-based-adsorbent-prepared-from-litchi-peel-biomass-via-pyrolysis-process-for-the-removal-of-pharmaceutical-pollutant-from-synthetic-aqueous-solution
#10
Vitória Segabinazzi Foletto, Ananda Bulegon Ferreira, Eric da Cruz Severo, Gabriela Carvalho Collazzo, Edson Luiz Foletto, Guilherme Luiz Dotto
A porous iron-based adsorbent obtained from litchi peel via pyrolysis process was prepared in this work, in order to evaluate its adsorptive potential for the removal of a pharmaceutical dye (amaranth) from aqueous solution. The material was characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. Several isotherm and kinetic models were tested aiming to represent the amaranth dye adsorption. The prepared sample presented magnetic property, and a mesoporous texture constituted of graphite and three iron-based phases...
March 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28281060/characterization-of-ferromagnetic-sludge-based-activated-carbon-and-its-application-in-catalytic-ozonation-of-p-chlorobenzoic-acid
#11
Siying Lu, Yongze Liu, Li Feng, Zhongen Sun, Liqiu Zhang
In order to solve the separation problem of powdered sludge-based activated carbon (SAC), a series of novel ferromagnetic sludge-based activated carbons (FMSACs, with different iron content 2.3, 4.3, and 9.5 wt%) with a good magnetic separation ability were prepared through co-precipitation method in this study. The structure and physicochemical properties of FMSACs and their catalytic ozonation performance on the removal of p-chlorobenzoic acid (p-CBA) were investigated. The saturation magnetization (Ms) of FMSACs was determined in the range of 0...
March 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28280788/effect-of-solvents-on-morphology-magnetic-and-dielectric-properties-of-%C3%AE-fe2o3-sio2-core-shell-nanoparticles
#12
Deepika P Joshi, Geeta Pant, Neha Arora, Seema Nainwal
Present work describes the formation of α-Fe2O3@SiO2 core shell structure by systematic layer by layer deposition of silica shell on core iron oxide nanoparticles prepared via various solvents. Sol-gel method has been used to synthesize magnetic core and the dielectric shell. The average crystallite size of iron oxide nanoparticles was calculated ∼20 nm by X-ray diffraction pattern. Morphological study by scanning electron microscopy revealed that the core-shell nanoparticles were spherical in shape and the average size of nanoparticles increased by varying solvent from methanol to ethanol to isopropanol due to different chemical structure and nature of the solvents...
February 2017: Heliyon
https://www.readbyqxmd.com/read/28280341/a-facile-method-to-prepare-superparamagnetic-iron-oxide-and-hydrophobic-drug-encapsulated-biodegradable-polyurethane-nanoparticles
#13
Kuo-Wei Cheng, Shan-Hui Hsu
Superparamagnetic iron oxide nanoparticles (SPIO NPs) have a wide range of biomedical applications such as in magnetic resonance imaging, targeting, and hyperthermia therapy. Aggregation of SPIO NPs can occur because of the hydrophobic surface and high surface energy of SPIO NPs. Here, we developed a facile method to encapsulate SPIO NPs in amphiphilic biodegradable polymer. Anionic biodegradable polyurethane nanoparticles (PU NPs) with ~35 nm size and different chemistry were prepared by waterborne processes...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28278773/cu2o-promoted-degradation-of-sulfamethoxazole-by-%C3%AE-fe2o3-catalyzed-peroxymonosulfate-under-circumneutral-conditions-synergistic-effect-cu-fe-ratios-and-mechanisms
#14
Yong Feng, Changzhong Liao, Hangkong Li, Chengshuai Liu, Kaimin Shih
To promote the application of iron oxides in sulfate radical-based advanced oxidation processes, a convenient approach using Cu2O as a catalyst additive was proposed. Composite catalysts based on α-Fe2O3 (CTX%Cu2O, X = 1, 2.5, 5, and 10) were prepared for peroxymonosulfate (PMS) activation, and sulfamethoxazole was used as a model pollutant to probe the catalytic reactivity. The results show that a synergistic catalytic effect exists between Cu2O and α-Fe2O3, which was explained by the promoted reduction of Fe(III) by Cu(I)...
February 28, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28276020/localizing-mrnas-encoding-mitochondrial-proteins-in-yeast-by-fluorescence-microscopy-and-subcellular-fractionation
#15
Dmitry Zabezhinsky, Hannah Sperber, Jeffrey E Gerst
Mitochondria are thought to have evolved from ancestral proteobacteria and, as a result of symbiosis, became an indispensable organelle in all eukaryotic cells. Mitochondria perform essential functions that provide the cell with ATP, amino acids, phospholipids, and both heme and iron-sulfur clusters. However, only 1% of mitochondrial proteins are encoded by the mitochondrial genome, while the remaining 99% are encoded in the nucleus. This raises a logistical challenge to the cell, as these nuclear-encoded proteins have to be translated, delivered to the mitochondrial surface, and translocated to its various compartments...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28274544/sonochemical-modification-of-carbon-nanotubes-for-enhanced-nanocomposite-performance
#16
Gareth J Price, Mohsan Nawaz, Tariq Yasin, Saira Bibi
Multi-walled carbon nanotubes (CNTs) have been treated using 20kHz ultrasound in combination with dilute nitric and sulfuric acids at much lower concentrations than previously reported. The measurements revealed an optimum set of sonication conditions (in this case 30min at 12Wcm(-2)) exists to overcome aggregation of the nanotubes and to allow efficient dispersion in ethanol or in chitosan. Transmission electron microscopy and Raman spectroscopy suggested the removal of amorphous material and reduction of the CNT diameter as well as modifications to their defect structures...
February 21, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28272786/synthesis-of-hexagonal-femnp-thin-films-from-a-single-source-molecular-precursor
#17
Andrew P Leitner, Desmond E Schipper, Jing-Han Chen, Adam C Colson, Irene Rusakova, Binod Kumar Rai, Emilia Morosan, Kenton Herbert Whitmire
The first heterobimetallic phosphide thin film containing iron, manganese, and phosphorus derived from the single-source precursor FeMn(CO)8(μ-PH2) has been prepared using a home-built metal-organic chemical vapor deposition apparatus. The thin film contains the same ratio of iron, manganese, and phosphorus as the initial precursor. The film becomes oxidized when deposited on a quartz substrate whereas the film deposited on an alumina substrate provides a more homogeneous product. Powder X-ray diffraction confirms the formation of metastable, hexagonal FeMnP phase that was previously only observed at temperatures above 1200 ºC...
March 8, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28267161/high-magnetisation-monodisperse-and-water-dispersible-cofe-pt-core-shell-nanoparticles
#18
Ngo T Dung, Nguyen Viet Long, Le T T Tam, Pham H Nam, Le D Tung, Nguyen X Phuc, Le T Lu, Nguyen Th Kim Thanh
High magnetisation and monodisperse CoFe alloy nanoparticles are desired for a wide range of biomedical applications. However, these CoFe nanoparticles are prone to oxidation, resulting in the deterioration of their magnetic properties. In the current work, CoFe alloy nanoparticles were prepared by thermal decomposition of cobalt and iron carbonyls in organic solvents at high temperatures. Using a seeded growth method, we successfully synthesised chemically stable CoFe@Pt core/shell nanostructures. The obtained core/shell nanoparticles have high saturation magnetisation up to 135 emu g(-1)...
March 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/28266831/investigating-the-mechanism-of-reversible-lithium-insertion-into-anti-nasicon-fe2-wo4-3
#19
Gözde Barim, Patrick Cottingham, Shiliang Zhou, Brent C Melot, Richard L Brutchey
The gram-scale preparation of Fe2(WO4)3 by a new solution-based route and detailed characterization of the material are presented. The resulting Fe2(WO4)3 undergoes a reversible electrochemical reaction against lithium centered around 3.0 V with capacities near 93% of the theoretical maximum. Evolution of the Fe2(WO4)3 structure upon lithium insertion and deinsertion is probed using a battery of characterization techniques, including in situ X-ray diffraction, neutron total scattering, and X-ray absorption spectroscopy (XAS)...
March 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28260966/peptide-functionalized-iron-oxide-magnetic-nanoparticle-for-gold-mining
#20
Wei-Zheng Shen, Sibel Cetinel, Kumakshi Sharma, Elham Rafie Borujeny, Carlo Montemagno
Here, we present our work on preparing a novel nanomaterial composed of inorganic binding peptides and magnetic nanoparticles for inorganic mining. Two previously selected and well-characterized gold-binding peptides from cell surface display, AuBP1 and AuBP2, were exploited. This nanomaterial (AuBP-MNP) was designed to fulfill the following two significant functions: the surface conjugated gold-binding peptide will recognize and selectively bind to gold, while the magnetic nano-sized core will respond and migrate according to the applied external magnetic field...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
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