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https://www.readbyqxmd.com/read/28345707/selectivity-control-between-mizoroki-heck-and-homo-coupling-reactions-for-synthesising-multinuclear-metal-complexes-unique-addition-effects-of-tertiary-phosphines-and-o2
#1
Yasuomi Yamazaki, Osamu Ishitani
The addition of a tertiary phosphine and O2 to reaction solutions strongly affected the reactivity and selectivity of coupling reactions between transition metal complexes. The Mizoroki-Heck reaction between metal complexes with bromo and those with vinyl groups in the diimine ligand did not proceed using Pd(OAc)2 in the presence of 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (Sphos) under Ar but proceeded selectively after injection of air into the reaction vessel. In the absence of the phosphine ligand, on the other hand, not only the Mizoroki-Heck reaction but also a homo-coupling reaction between the metal complexes with the bromo groups proceeded at the same time...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28345690/expedient-synthesis-of-a-phenanthro-imidazo-pyridine-fused-heteropolynuclear-framework-via-cdc-coupling-a-new-class-of-luminophores
#2
Biswadip Banerji, Satadru Chatterjee, K Chandrasekhar, Suvankar Bera, Leena Majumder, Chandraday Prodhan, Keya Chaudhuri
We herein report the design and synthesis of a group of fused phenanthro-imidazo[1,2-a]pyridine derivatives as a new class of luminescent materials through a Pd(ii) catalyzed intramolecular CDC (cross dehydrogenative coupling) reaction. This method thus unlocked a convenient & expedient way for the synthesis of a new molecular framework containing π-extended fused heteropolycycles. The heteropolycycles showed very good fluorescence properties both in solid and solution phases which were further utilized in live cell imaging...
March 27, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28342307/simple-fabrication-of-pineapple-root-like-palladium-gold-catalysts-as-the-high-efficiency-cathode-in-direct-peroxide-peroxide-fuel-cells
#3
Xin Wang, Ke Ye, Ce Sun, Hongyu Zhang, Kai Zhu, Kui Cheng, Guiling Wang, Dianxue Cao
Pd-Au/TiC electrodes with various three-dimensional structures are obtained by the pulsed potential electro-deposition in PdCl2/HAuCl4 electrolytes. The morphologies of Pd-Au/TiC composite catalysts are significantly dependent on the component of deposited solutions. The surface appearance of Pd-Au catalysts changes from rime-shaped structure, to feather-like construction, then to pineapple root-like structure and finally to flower-like configuration with the increase of PdCl2 content in electrolytes. These particular three-dimensional structures may be very suitable for H2O2 electro-reduction, which assures a high utilization of Pd-Au catalysts and provides a large specific surface area...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28339766/higher-bioavailability-of-doxycycline-in-broiler-chickens-with-a-novel-in-feed-pharmaceutical-formulation
#4
Lilia Gutiérrez, Juan Zermeño, Yazmín Alcalá, Héctor Sumano
Bioavailability of a new, long-acting (LA) pharmaceutical preparation for administering doxycycline as in-feed medication to broiler chickens was compared to the standard in-feed administration of doxycycline. A commercial poultry house harboring Ross-308 broiler chickens, weighing 450 g, was divided into 7 sections as follows: doxy-FOLA group (n = 6,000 chickens divided into 3 replicates) medicated with 10% doxycyline, long-acting pellets at a dose of 400 g of doxycycline HCl/ton of food, resulting in a calculated dose of 48 mg/kg for 5 d; doxy-ref group (n = 6,000, divided into 3 replicates) medicated as for doxy-FOLA, but using a 20% commercial preparation of doxycycline...
February 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339183/tunable-porosity-of-crosslinked-polyhedral-oligomeric-silsesquioxane-poss-supports-for-palladium-catalyzed-aerobic-alcohol-oxidation-in-water
#5
Preeyanuch Sangtrirutnugul, Thanawat Chaiprasert, Warodom Hunsiri, Thanudkit Jitjaroendee, Patsaya Songkhum, Kritapas Laohhasurayotin, Tanakorn Osotchan, Vuthichai Ervithayasuporn
Polyhedral oligomeric silsesquioxane (POSS)-based materials, poly-POSS-Tn [n = 8 (1), 10 (2), 12 (3), and mix (4)], were prepared in high yields via free radical polymerization of corresponding pure forms of methacrylate-functionalized POSS monomers, MMA-POSS-Tn (n = 8, 10, 12), and the mixture form, MMA-POSS-Tmix. Powder X-ray diffraction (XRD) spectra and BET analysis indicate that 1-4 are amorphous materials with high surface areas (683-839 m2•g-1). The surface areas and total pore volumes follow the trend: poly-POSS-T12 > poly-POSS-T10 > poly-POSS-Tmix > poly-POSS-T8...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28333433/high-performance-complementary-transistors-and-medium-scale-integrated-circuits-based-on-carbon-nanotube-thin-films
#6
Zhiyong Zhang, Yingjun Yang, Li Ding, Jie Han, Lian-Mao Peng
Solution-derived carbon nanotube (CNT) network films with high semiconducting purity are suitable materials for the wafer-scale fabrication of field-effect transistors (FETs) and integrated circuits (ICs). However, it is challenging to realize high-performance complementary metal-oxide-semiconductor (CMOS) FETs with high yield and stability on such CNT network films, and this difficulty hinders the development of CNT-film-based ICs. In this work, we developed a doping-free process for the fabrication of CMOS FETs based on solution-processed CNT network films, in which the polarity of the FETs was controlled by using Sc or Pd as the source/drain contacts to selectively inject carriers into the channels...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28323016/identifying-the-shared-metabolic-objectives-of-glycerol-bioconversion-in-klebsiella-pneumoniae-under-different-culture-conditions
#7
Gongxian Xu, Caixia Li
This paper addresses the problem of identifying the shared metabolic objectives of glycerol bioconversion in Klebsiella pneumoniae for production of 1,3-propanediol (1,3-PD) under different culture conditions. To achieve this goal, we propose a multi-level programming model. This model includes three optimization problems, where the constraint region of the first level problem is implicitly determined by the other two optimization problems. The optimized objectives of the first and second level problems are to minimize the set of fluxes that are of major importance to glycerol metabolism and the difference between the observed fluxes and those computed by the model, respectively...
March 18, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28319667/a-generalized-method-for-the-synthesis-of-ligand-free-m-sio2-m-ag-au-pd-pt-yolk-shell-nanoparticles
#8
Firdoz Shaik, Weiqing Zhang, Wenxin Niu
A universal method is reported for the synthesis of ligand free noble metal M@SiO2 (M=Ag, Au, Pd, Pt) yolk-shell nanoparticles (YSNs). Mesoporous hollow silica shells (mHSS) are used as smart nanoreactors for the synthesis of noble metal yolk-shell nanoparticles. The nanocavity of a mHSS and anionic metal ions play a critical role in formation of yolk-shell nanoparticles. The synthesis mechanism can be tuned by simply varying the pH of the noble metal precursor aqueous solution. A critical pH ≥ 4 is required for the formation of YSNs...
March 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28315381/alfa-helix-to-beta-sheet-transition-in-long-chain-poly-l-lysine-formation-of-alfa-helical-fibrils-by-poly-l-lysine
#9
Katarzyna Cieślik-Boczula
The temperature-induced α-helix to β-sheet transition in long-chain poly-l-lysine (PLL), accompanied by the gauche-to-trans isomerization of CH2 groups in the hydrocarbon side chains of Lys amino acid residues, and formation of β-sheet as well as α-helix fibrillar aggregates of PLL have been studied using Fourier-transform infrared (FT-IR) and vibrational circular dichroism (VCD) spectroscopy, and transmission electron microscopy (TEM). In a low-temperature alkaline water solution or in a methanol-rich water mixture, the secondary structure of PLL is represented by α-helical conformations with unordered and gauche-rich hydrocarbon side chains...
March 14, 2017: Biochimie
https://www.readbyqxmd.com/read/28315002/determination-of-platinum-group-elements-in-particulate-matter-by-inductively-coupled-plasma-mass-spectrometry
#10
Jasmina Rinkovec, Gordana Pehnec, Silva Žužul, Sanda Rončević
This study examined a method for determination of rhodium (Rh), palladium (Pd) and platinum (Pt) in particulate matter using standard solutions, model samples and certified reference materials (NIST 1648a and ERM CZ120). The method was based on microwave digestion followed by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the stability of the standard solution mixture of Rh, Pd and Pt was better when chlorides were present in the solution. A membrane filter and one type of quartz filter were the most adequate for analyzing platinum group elements (PGE)...
March 17, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28303800/nanoparticles-alloying-in-liquids-laser-ablation-generated-ag-or-pd-nanoparticles-and-laser-irradiation-induced-agpd-nanoparticle-alloying
#11
N G Semaltianos, R Chassagnon, V Moutarlier, V Blondeau-Patissier, M Assoul, G Monteil
Laser irradiation of a mixture of single-element micro/nanomaterials may lead to their alloying and fabrication of multi-element structures. In addition to the laser induced alloying of particulates in the form of micro/nanopowders in ambient atmosphere (which forms the basis of the field of additive manufacturing technology), another interesting problem is the laser-induced alloying of a mixture of single-element nanoparticles in liquids since this process may lead to the direct fabrication of alloyed-nanoparticle colloidal solutions...
April 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28273514/one-pot-hydrothermal-synthesis-of-magnetically-recoverable-palladium-reduced-graphene-oxide-nanocomposites-and-its-catalytic-applications-in-cross-coupling-reactions
#12
Wenzhi Fu, Zhuqing Zhang, Peiyuan Zhuang, Jianfeng Shen, Mingxin Ye
A facile, green, economical approach was designed to deposit palladium nanoparticles on magnetic reduced graphene oxide nanosheets (Pd-Fe3O4/rGO) via a one-pot hydrothermal synthesis method. The prepared Pd-Fe3O4/rGO nanocomposites were thoroughly characterized by Transmission electron microscopy, Scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy. Importantly, the highly efficient catalytic property of the as-obtained Pd-Fe3O4/rGO catalyst was demonstrated for the Suzuki-Miyaura coupling reaction and Mizoroki-Heck coupling reaction...
July 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28270509/in-situ-and-in-silico-kinetic-analyses-of-the-programmed-cell-death-1-programmed-cell-death-ligands-and-b7-1-interaction-network
#13
Kaitao Li, Xiaoxiao Cheng, Andreas Tilevik, Simon J Davis, Cheng Zhu
Programmed cell death-1 (PD-1) is an inhibitory receptor with an essential role in maintaining peripheral tolerance, and among the most promising immunotherapeutic targets for treating cancer, autoimmunity, and infectious diseases. A complete understanding of the consequences of PD-1 engagement by its ligands, PD-L1 and PD-L2, and of PD-L1 binding to B7-1, requires quantitative analysis of their interactions at the cell surface. We present here the first complete in situ kinetic analysis of the PD-1/PD-1 ligands/B7-1 system...
March 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28262888/computational-study-of-c-sp-3-o-bond-formation-at-a-pd-iv-centre
#14
Allan J Canty, Alireza Ariafard, Nicole M Camasso, Andrew T Higgs, Brian F Yates, Melanie S Sanford
This report describes a computational study of C(sp(3))-OR bond formation from Pd(IV) complexes of general structure Pd(IV)(CH2CMe2-o-C6H4-C,C')(F)(OR)(bpy-N,N') (bpy = 2,2'-bipyridine). Dissociation of (-)OR from the different octahedral Pd(IV) starting materials results in a common square-pyramidal Pd(IV) cation. An SN2-type attack by (-)OR ((-)OR = phenoxide, acetate, difluoroacetate, and nitrate) then leads to C(sp(3))-OR bond formation. In contrast, when (-)OR = triflate, concerted C(sp(3))-C(sp(2)) bond-forming reductive elimination takes place, and the calculations indicate this outcome is the result of thermodynamic rather than kinetic control...
March 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28259952/ppar%C3%A2-%C3%AE-agonist-rosiglitazone-protects-rat-peritoneal-mesothelial-cells-against-peritoneal-dialysis-solution%C3%A2-induced-damage
#15
Yun-Fang Zhang, Qi Wang, Yan-Yan Su, Jie-Lin Wang, Bao-Jun Hua, Shen Yang, Jun-Xia Feng, Hong-Yan Li
Long-term peritoneal dialysis (PD) leads to ultrafiltration failure (UFF). Peritoneal mesothelial cells, which form the innermost monolayer of the peritoneal cavity, have been shown to regulate various responses, including inflammation, in UFF. The present study was designed to investigate the effect of the peroxisome proliferator‑activated receptor‑γ (PPAR‑γ) agonist, rosiglitazone, on peritoneal dialysis solution (PDS)‑induced injuries in rat peritoneal mesothelial cells (RPMCs). RPMCs were cultured for different durations and with different concentrations of PDS...
February 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28258967/paragenesis-of-palladium-cobalt-nanoparticle-in-nitrogen-rich-carbon-nanotubes-as-bifunctional-electrocatalyst-for-hydrogen-evolution-reaction-and-oxygen-reduction-reaction
#16
Binbin Huang, Liyu Chen, Yan Wang, Liuzhang Ouyang, Jianshan Ye
Hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) play important role in many energy conversion and storage systems. To accelerate the reaction process, efficient catalyst is always needed. The present work develops a facile process through pyrolysis for cosynthesis of palladium-cobalt nanoparticle supported over carbon nanotubes (Pd-CoCNTs), which exhibits superior catalytic activity for HER and enhance ORR performance. The Pd nanoparticles without agglomeration in diameters of 2-4 nm are uniformly distributed around the CoCNTs surface, while the inner Co particles are essential element in forming the framework of CoCNTs...
March 4, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28256655/impacts-of-anions-on-the-oxygen-reduction-reaction-kinetics-on-platinum-and-palladium-surfaces-in-alkaline-solutions
#17
Shangqian Zhu, Xiaomeng Hu, Minhua Shao
The fundamental understanding of the impacts induced by anions on oxygen reduction reaction (ORR) in alkaline media is of great importance in the design of more advanced catalysts for alkaline fuel cells (AFC). In this study, the specific adsorption of F(-), Cl(-), ClO4(-), CO3(2-), SO4(2-), and citrate anions on Pt/C and Pd/C catalysts, and their impacts on the ORR kinetics in alkaline solutions were systematically studied. It was found that F(-), Cl(-) and ClO4(-) did not specifically adsorb on Pt or Pd surfaces and had no poisoning effect on ORR...
March 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28251697/-biocompatible-neutral-ph-low-gdp-peritoneal-dialysis-solutions-much-ado-about-nothing
#18
Paraish S Misra, Sharon J Nessim, Jeffrey Perl
Adverse outcomes in peritoneal dialysis (PD), including PD related infections, the loss of residual kidney function (RKF), and longitudinal, deleterious changes in peritoneal membrane function continue to limit the long-term success of PD therapy. The observation that these deleterious changes occur upon exposure to conventional glucose-based PD solutions fuels the search for a more biocompatible PD solution. The development of a novel PD solution with a neutral pH, and lower in glucose degradation products (GDPs) compared to its conventional predecessors has been labeled a "biocompatible" solution...
March 2017: Seminars in Dialysis
https://www.readbyqxmd.com/read/28247603/-high-glucose-dialysate-enhances-peritoneal-fibrosis-through-upregulating-glucose-transporters-glut1-and-sglt1
#19
Mengqi Hong, Zhenyu Nie, Zhengyue Chen, Xiongwei Yu, Beiyan Bao
Objective: To investigate the role of glucose transporter 1 (GLUT1) and sodium-glucose cotransporter 1 (SGLT1) in high glucose dialysate-induced peritoneal fibrosis. Methods: Thirty six male SD rats were randomly divided into 6 groups (6 in each):normal control group, sham operation group, peritoneal dialysis group (PD group), PD+phloretin group (PD+T group), PD+phlorizin group (PD+Z group), PD+phloretin+phlorizin group (PD+T+Z group). Rat model of uraemia was established using 5/6 nephrotomy, and 2.5% dextrose peritoneal dialysis solution was used in peritoneal dialysis...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28213150/preparation-of-the-go-pd-nanocomposite-and-its-application-for-the-degradation-of-organic-dyes-in-water
#20
Afshan Omidvar, Babak Jaleh, Mahmoud Nasrollahzadeh
A GO/Pd nanocomposite has been successfully synthesized applying a simple method via immobilizing Pd on the surface of the graphene oxide (GO). The GO/Pd nanocomposite was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) spectroscopy, Raman, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques. The surface morphology of Pd NPs was viewed by TEM, the particles are spherical with an average particle size of 11nm...
February 9, 2017: Journal of Colloid and Interface Science
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