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https://www.readbyqxmd.com/read/28821883/synthesis-of-pincer-type-extractants-for-selective-extraction-of-palladium-from-pgms-an-improved-liquid-liquid-extraction-approach-to-current-refining-processes
#1
Muniyappan Rajiv Gandhi, Manabu Yamada, Kazutoshi Haga, Atsushi Shibayama
SCS pincer ligands 1-4 were synthesised, and their ability to extract Pd(II) from HCl and HNO3 media was studied. The Pd(II) extraction properties of 1-4 were compared with those of commercial extractants (DOS and LIX(®)84-I) in kerosene. 1 and 2 showed superior Pd(II) extractability (E% = 99.9) relative to DOS and LIX(®)84-I from 0.1-8.0 M HCl and to DOS from 0.1-8.0 M HNO3 and mixed HCl + HNO3 media. The Pd(II) extraction rate, acid durability, the most suitable organic/aqueous (O/A) phase ratio, and Pd(II) loading capacity of extractants 1, 2, and DOS were evaluated...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819627/pharmacokinetics-and-pharmacodynamics-evaluation-of-tramadol-in-thermoreversible-gels
#2
Juliana Zampoli Boava Papini, Cíntia Maria Saia Cereda, José Pedrazzoli Júnior, Silvana Aparecida Calafatti, Daniele Ribeiro de Araújo, Giovana Radomille Tofoli
We evaluated pharmacokinetics (PK) and pharmacodynamics (PD) induced by new formulations of tramadol (TR) in thermoreversible gels. The poloxamer- (PL-) tramadol systems were prepared by direct dispersion of the drug in solutions with PL 407 and PL 188. The evaluated formulations were as follows: F1: TR 2% in aqueous solution and F2: PL 407 (20%) + PL 188 (10%) + TR 2%; F3: PL 407 (25%) + PL 188 (5%) + TR 2%; F4: PL 407 (20%) + TR 2%. New Zealand White rabbits were divided into four groups (n = 6) and treated by subcutaneous route with F1, F2, F3, or F4 (10 μg·kg(-1))...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28818018/effect-of-operational-parameters-and-pd-in-catalyst-in-the-reduction-of-nitrate-using-copper-electrode
#3
Thiago Favarini Beltrame, Vanessa Coelho, Luciano Marder, Jane Zoppas Ferreira, Fernanda Albana Marchesini, Andrea Moura Bernardes
Water with high concentration of nitrate may cause damage to health and to the environment. This study investigated how concentration, current density, flow, pH, the use of Pd/In catalyst and operating mode (constant current density and constant cell potential) have an influence in the electrochemical reduction of nitrate and in the formation of gaseous compounds using copper electrode. Experiments were performed in two-compartment electrolytic cells separated by a cationic membrane with nitrate model solutions prepared as a surrogate of concentrated brines from membrane desalination plants...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#4
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28801614/palladium-nanoparticles-entrapped-in-a-self-supporting-nanoporous-gold-wire-as-sensitive-dopamine-biosensor
#5
Xin Yi, Yuxuan Wu, Guoxin Tan, Peng Yu, Lei Zhou, Zhengnan Zhou, Junqi Chen, Zhengao Wang, Jinshan Pang, Chengyun Ning
Traced dopamine (DA) detection is critical for the early diagnosis and prevention of some diseases such as Parkinson's, Alzheimer and schizophrenia. In this research, a novel self-supporting three dimensional (3D) bicontinuous nanoporous electrochemical biosensor was developed for the detection of dopamine by Differential Pulse Voltammetry (DPV). This biosensor was fabricated by electrodepositing palladium nanoparticles (Pd) onto self-supporting nanoporous gold (NPG) wire. Because of the synergistic effects of the excellent catalytic activity of Pd and novel structure of NPG wire, the palladium nanoparticles decorated NPG (Pd/NPG) biosensor possess tremendous superiority in the detection of DA...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28799204/electrochemical-reduction-of-carbon-dioxide-in-a-monoethanolamine-capture-medium
#6
Jie Zhang, Lu Chen, Fengwang Li, Ying Zhang, Cameron Bentley, Mike Horne, Alan Bond
Electrocatalytic reduction of CO2 present in a 30% (w/w) monoethanolamine (MEA) aqueous solution has been undertaken at In, Sn, Bi, Pb, Pd, Ag, Cu and Zn metal electrodes. Upon dissolution of CO2, the non-conducting MEA solution is transformed into a conducting one, as needed for electrochemical reduction of CO2. Both an increase in the electrode surface porosity and addition of surfactant cetyltrimethylammonium bromide (CTAB) suppress the competing hydrogen evolution reaction with the latter having a significantly stronger impact...
August 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28797563/binding-of-a-type-1-rip-and-of-its-chimeric-variant-to-phospholipid-bilayers-evidence-for-a-link-between-cytotoxicity-and-protein-membrane-interactions
#7
Elio Pizzo, Rosario Oliva, Rita Morra, Andrea Bosso, Sara Ragucci, Luigi Petraccone, Pompea Del Vecchio, Antimo Di Maro
Ribosome-inactivating proteins (RIPs) are enzymes, almost all identified in plants, able to kill cells by depurination of rRNAs. Recently, in order to improve resistance to proteolysis of a type 1 RIP (PD-L4), we produced a recombinant chimera combining it with a wheat protease inhibitor (WSCI). Resulting chimeric construct, named PD-L4UWSCI, in addition to present the functions of the two domains, shows also an enhanced cytotoxic action on murine cancer cells when compared to PD-L4. Since different ways of interaction of proteins with membranes imply different resulting effects on cells, in this study we investigate conformational stability of PD-L4 and PD-L4UWSCI and their interaction with membrane models (liposomes)...
August 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28797124/preclinical-development-of-a-vaccine-against-oligomeric-alpha-synuclein-based-on-virus-like-particles
#8
Marika Doucet, Aadil El-Turabi, Franziska Zabel, Benjamin H M Hunn, Nora Bengoa-Vergniory, Milena Cioroch, Mauricio Ramm, Amy M Smith, Ariane Cruz Gomes, Gustavo Cabral de Miranda, Richard Wade-Martins, Martin F Bachmann
Parkinson's disease (PD) is a progressive and currently incurable neurological disorder characterised by the loss of midbrain dopaminergic neurons and the accumulation of aggregated alpha-synuclein (a-syn). Oligomeric a-syn is proposed to play a central role in spreading protein aggregation in the brain with associated cellular toxicity contributing to a progressive neurological decline. For this reason, a-syn oligomers have attracted interest as therapeutic targets for neurodegenerative conditions such as PD and other alpha-synucleinopathies...
2017: PloS One
https://www.readbyqxmd.com/read/28781132/-taking-training-to-the-next-level-the-american-college-of-surgeons-committee-on-residency-training-survey
#9
Richard B Damewood, Patrice Gabler Blair, Yoon Soo Park, Linda K Lupi, Rachel Williams Newman, Ajit K Sachdeva
OBJECTIVE: The American College of Surgeons (ACS) appointed a committee of leaders from the ACS, Association of Program Directors in Surgery, Accreditation Council for Graduate Medical Education, and American Board of Surgery to define key challenges facing surgery resident training programs and to explore solutions. The committee wanted to solicit the perspectives of surgery resident program directors (PDs) given their pivotal role in residency training. DESIGN: Two surveys were developed, pilot tested, and administered to PDs following Institutional Review Board approval...
August 3, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28780725/a-review-of-oral-cannabinoids-and-medical-marijuana-for-the-treatment-of-chemotherapy-induced-nausea-and-vomiting-a-focus-on-pharmacokinetic-variability-and-pharmacodynamics
#10
REVIEW
Melissa E Badowski
PURPOSE: Oral cannabinoids (i.e., dronabinol, nabilone) containing the active component of marijuana, delta(Δ)9-tetrahydrocannabinol (THC), are available for the treatment of chemotherapy-induced nausea and vomiting (CINV) in patients with cancer who have failed to adequately respond to conventional antiemetic therapy. The aim of this article is to provide an overview of the efficacy, pharmacokinetics (PK), pharmacodynamics (PD), and safety of oral cannabinoids for patients with CINV...
August 5, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28777579/controlling-the-deposition-of-pd-on-au-nanocages-outer-surface-only-versus-both-outer-and-inner-surfaces
#11
Miaoxin Yang, Wenxia Wang, Kyle D Gilroy, Younan Xia
When a metal salt precursor is reduced in the presence of Au nanocages with a hollow interior and porous walls, the resultant atoms can, in principle, be deposited onto both outer and inner surfaces, or just the outer surface only. Here we demonstrate that these two different scenarios of deposition can be deterministically achieved by controlling the reduction kinetics of the precursor. Specifically, if PdCl42- is used as a precursor to elemental Pd, its fast reduction kinetics favors a solution reduction pathway where the resultant Pd atoms are deposited only onto the outer surface for the generation of Au@Pd double-shelled nanocages...
August 4, 2017: Nano Letters
https://www.readbyqxmd.com/read/28776022/smart-nanocatalysts-with-streamline-shapes
#12
Guowu Zhan, Hua Chun Zeng
Particulate catalysts with streamline shapes have important impacts on fluid-related reactions, and they need to be properly characterized. However, utilization of streamline-shaped catalysts for heterogeneous catalysis has remained an unexplored area due to the lack of easy-to-use techniques to produce such shaped catalysts, especially at the small length scale of the submicron to micron regime. Herein, we report our recent development of a class of prototype nanocatalysts with streamline shapes. In this research, the kinetic control is adapted to obtain streamline-shaped supports, followed by functionalizing such supports with catalytically active metal nanoclusters (e...
July 26, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28771333/highly-cytotoxic-palladium-ii-pincer-complexes-based-on-picolinylamides-functionalized-with-amino-acids-bearing-ancillary-s-donor-groups
#13
Svetlana G Churusova, Diana V Aleksanyan, Ekaterina Yu Rybalkina, Olga Yu Susova, Valentina V Brunova, Rinat R Aysin, Yulia V Nelyubina, Alexander S Peregudov, Evgenii I Gutsul, Zinaida S Klemenkova, Vladimir A Kozlov
The reactions of picolinyl and 4-chloropicolinyl chlorides with methyl esters of S-methyl-l-cysteine, l- and d-methionine, and l-histidine afforded a series of functionalized carboxamides, which readily formed pincer-type complexes upon interaction with PdCl2(NCPh)2 in solution under mild conditions. The direct cyclopalladation of the ligands derived was also accomplished in the solid phase, in particular, mechanochemically, although it was complicated by the partial deactivation of the starting amides. The resulting complexes with 5,5- and 5,6-membered fused metallocycles were fully characterized by IR and NMR spectroscopy, including variable-temperature and 2D-NMR studies...
August 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28768763/a-solute-binding-protein-in-the-closed-conformation-induces-atp-hydrolysis-in-a-bacterial-atp-binding-cassette-transporter-involved-in-the-import-of-alginate
#14
Ai Kaneko, Kasumi Uenishi, Yukie Maruyama, Nobuhiro Mizuno, Seiki Baba, Takashi Kumasaka, Bunzo Mikami, Kousaku Murata, Wataru Hashimoto
The Gram-negative bacterium Sphingomonas sp. A1 incorporates alginate into cells via the cell-surface pit without prior depolymerization by extracellular enzymes. Alginate import across cytoplasmic membranes thereby depends on the ATP-binding cassette (ABC) transporter AlgM1M2SS (a heterotetramer of AlgM1, AlgM2, and AlgS), which cooperates with the periplasmic solute-binding protein AlgQ1 or AlgQ2; however, several details of AlgM1M2SS-mediated alginate import are not well understood. Herein, we analyzed ATPase and transport activities of AlgM1M2SS after reconstitution into liposomes with AlgQ2 and alginate oligosaccharide substrates having different polymerization degrees (PDs)...
August 2, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28766494/resting-energy-expenditure-a-valuable-predictor-for-kt-vurea-in-peritoneal-dialysis-patients%C3%A2
#15
Tian Xu, Jingyuan Xie, Weiming Wang, Hong Ren, Nan Chen
OBJECTIVE: The objective of this study was to identify an effective method for predicting small-molecule solute removal at the commencement of or before peritoneal dialysis (PD). METHODS: The PD patients with a dialysis delivery of 8 L/d and a residual kidney function (RKF) ≤ 5 mL/min were enrolled in the study. Fat-free lean body mass (FFM) and resting energy expenditure (REE) were measured using bioelectrical impedance (BIA). A receiver operating characteristic (ROC) curve was drawn to determine the threshold value for REE...
September 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28765896/1-25-oh-2d3-treatment-attenuates-high-glucose%C3%A2-induced-peritoneal-epithelial-to-mesenchymal-transition-in-mice
#16
Lina Yang, Yi Fan, Xiuli Zhang, Wenyu Huang, Jianfei Ma
It has been previously demonstrated that 1,25(OH)2D3 prevents the progression of epithelial to mesenchymal transition (EMT). However, it remains unclear whether 1,25(OH)2D3 has a role in peritoneal EMT stimulated by high glucose (HG) peritoneal dialysis fluid (PDF). The present study was performed to investigate the role of 1,25(OH)2D3 in the progression of EMT in the peritoneal mesothelium. A total of 35 male Kunming mice were randomly assigned into seven groups. In the control group, no diasylate or saline was infused...
July 27, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28765564/acceleration-of-batch-type-heterogeneous-ligand-free-suzuki-miyaura-reactions-with-polymer-composite-supported-pd-catalyst
#17
Mian Wang, Han Xue, Fei Ju, Haijie Yang
An efficient and recyclable palladium (II) catalyst supported on a double-structured amphiphilic polymer composite was reported previously containing a polymer hydrogel within macroporous polystyrene (PS) microspheres. However, some critical questions have been unaddressed. First, the catalyst accelerated the heterogeneous ligand-free batch Suzuki-Miyaura reaction in a H2O/EtOH mixture solution at room temperature in the presence of air, which could be ascribed to the "on-water" effect taking place at the interface of the aqueous-organic and basic-aqueous phases created by sodium carbonate in H2O/EtOH...
August 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28762572/promoting-effect-of-ni-oh-2-on-palladium-nanocrystals-leads-to-greatly-improved-operation-durability-for-electrocatalytic-ethanol-oxidation-in-alkaline-solution
#18
Wenjing Huang, Xian-Yin Ma, Han Wang, Renfei Feng, Jigang Zhou, Paul N Duchesne, Peng Zhang, Fengjiao Chen, Na Han, Feipeng Zhao, Junhua Zhou, Wen-Bin Cai, Yanguang Li
Most electrocatalysts for the ethanol oxidation reaction suffer from extremely limited operational durability and poor selectivity toward the CC bond cleavage. In spite of tremendous efforts over the past several decades, little progress has been made in this regard. This study reports the remarkable promoting effect of Ni(OH)2 on Pd nanocrystals for electrocatalytic ethanol oxidation reaction in alkaline solution. A hybrid electrocatalyst consisting of intimately mixed nanosized Pd particles, defective Ni(OH)2 nanoflakes, and a graphene support is prepared via a two-step solution method...
August 1, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28761770/extended-peritoneal-dialysis-and-renal-recovery-in-hiv-infected-patients-with-prolonged-aki-a-report-of-2-cases
#19
Donlawat Saengpanit, Pongpratch Puapatanakul, Piyaporn Towannang, Talerngsak Kanjanabuch
Peritoneal dialysis (PD) has recently been established as a treatment option for renal replacement therapy (RRT) in patients with acute kidney injury (AKI). Its efficacy in providing fluid and small solute removal has also been demonstrated in clinical trials and is equivalent to hemodialysis (HD). However, effect of RRT modality on renal recovery after AKI remains a controversy. Moreover, the setting of human immunodeficiency virus- (HIV-) infected patients with AKI requiring RRT makes the decision on RRT initiation and modality selection more complicated...
2017: Case Reports in Nephrology
https://www.readbyqxmd.com/read/28753508/photocatalytic-ozonation-using-doped-tio2-catalysts-for-the-removal-of-parabens-in-water
#20
João F Gomes, Inês Leal, Katarzyna Bednarczyk, Marta Gmurek, Marek Stelmachowski, Magdalena Diak, M Emília Quinta-Ferreira, Raquel Costa, Rosa M Quinta-Ferreira, Rui C Martins
Conventional wastewater treatments are inefficient for the removal of parabens. The aim of this study was finding a suitable solution using ozone and UVA irradiation combined with TiO2 catalysts doped with different noble metals (Ag, Pt, Pd, Au). Photocatalytic ozonation required lower amounts of ozone for higher efficiency on the removal of parabens, chemical oxygen demand (COD) and total organic carbon (TOC). The best catalyst for the initial contaminants degradation was 0.5% Ag-TiO2 leading to total parabens removal using 46mgO3/L...
July 25, 2017: Science of the Total Environment
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