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https://www.readbyqxmd.com/read/28735537/a-versatile-tetrablock-copolymer-scaffold-for-hierarchical-colloidal-nanoparticle-assemblies-synthesis-characterization-and-molecular-dynamics-simulations
#1
Gema Marcelo, Fraser P Burns, Tânia Ribeiro, José M Gaspar Martinho, M Pilar Tarazona, Enrique Saiz, Matthew G Moffitt, Jose Paulo Sequeira Farinha
A unique combination of molecular dynamics simulations and detailed multi-angle light scattering size exclusion chromatography (SEC-MALS) analysis is used to provide important a priori insights into the solution self-assembly of a well-defined and symmetric tetrablock copolymer with two acrylic acid outer blocks, two polystyrene inner blocks and a trithiocarbonate (TTC) central group, prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. SEC-MALS experiments show that the copolymer forms aggregates in both tetrahydrofuran (THF) and N-dimethylformamide (DMF), even in the presence of different salts, but not in 1,4-dioxane (dioxane)...
July 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28733990/dimethyl-fumarate-modulates-neutrophil-extracellular-trap-formation-in-a-glutathione-and-superoxide-dependent-manner
#2
J H O Hoffmann, K Schaekel, D Hartl, A H Enk, E N Hadaschik
BACKGROUND: Neutrophil (polymorphonuclear) granulocytes (PMN) were shown to contribute to the pathogenesis of psoriasis by releasing IL-17 and LL-37/ DNA complexes via neutrophil extracellular traps (NET), webs of chromatin strands decorated with antimicrobial peptides, in psoriatic skin. Fumaderm(®) , a fumaric acid ester (FAE) formulation consisting of different FAE salts has been successfully used to treat psoriasis for decades. Most recently, FAE treatment was reported to inhibit NET formation in murine epidermolysis bullosa acquisita...
July 22, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28732874/preparation-and-prediction-of-physical-properties-of-cellulose-acetate-and-polyamide-polymer-blend
#3
Dipti Khaparde
In this paper the physical properties of the polymer blend of lab synthesized Polyamide (PA) and commercial Cellulose Acetate (CA) was focused. The molecular interactions of CA/PA were investigated thoroughly by means of solubility, viscosity, specific gravity and diffusivity study with different concentrations of the CA/PA combinations and the blend of CA/PA was characterized by optical microscope and differential scanning calorimetry (DSC). Dimethyl formamide (DMF) was selected as solvent for the CA/PA polymer blend at 28°C...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732748/controlling-the-pro-inflammatory-function-of-6-sulfo-lacnac-slan-dendritic-cells-with-dimethylfumarate
#4
Stephanie Oehrl, Florina Olaru, Anja Kunze, Michael Maas, Silvia Pezer, Marc Schmitz, Knut Schäkel
BACKROUND: The fumaric acid ester (FAE) dimethylfumarate (DMF) is a small molecule immunomodulator successfully used for the treatment of psoriasis and multiple sclerosis (MS). DMF is thought to inhibit pathogenic immune responses with Th17/Th1T cells, and IL-23/IL-12 producing dendritic cells (DCs). 6-sulfo LacNAc expressing dendritic cells (slanDCs) are a human pro-inflammatory cell type found frequently among the infiltrating leukocytes in skin lesions of psoriasis and brain lesions of MS...
June 24, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28731341/a-2d-coordination-network-that-detects-nitro-explosives-in-water-catalyzes-baylis-hillman-reactions-and-undergoes-unusual-2d%C3%A2-3d-single-crystal-to-single-crystal-transformation
#5
Vivekanand Sharma, Dinesh De, Sanchari Pal, Prithwidip Saha, Parimal K Bharadwaj
The solvothermal reaction of Zn(NO3)2·6H2O and a linear dicarboxylate ligand H2L, in the presence of urotropine in N,N'-dimethylformamide (DMF), gives rise to a new porous two-dimensional (2D) coordination network, {[Zn3(L)3(urotropine)2]·2DMF·3H2O}n (1), with hxl topology. Interestingly, framework 1 exhibits excellent emission properties owing to the presence of naphthalene moiety in the linker H2L, that can be efficiently suppressed by subtle quantity of nitro explosives in aqueous medium. Furthermore, presence of urotropine molecules bound to the metal centers, 1 is found to be an excellent heterogeneous catalyst meant for atom-economical C-C bond-forming Baylis-Hillman reactions...
July 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28724290/identifying-and-breaking-scaling-relations-in-molecular-catalysis-of-electrochemical-reactions
#6
Michael L Pegis, Catherine F Wise, Brian Koronkiewicz, James M Mayer
Improving molecular catalysis for important electrochemical PCET reactions, such as the interconversions of H+/H2, O2/H2O, CO2/CO, and N2/NH3, is an ongoing challenge. Synthetic modifications to the molecular catalysts are valuable but often show trade-offs between turnover frequency (TOF) and the effective overpotential required to initiate catalysis (eff). Herein, we derive a new approach for improving efficiencies - higher TOF at lower eff - by changing the concentrations and properties of the reactants and products, rather than by modifying the catalyst...
July 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28723092/microwave-assisted-synthesis-of-diversely-substituted-quinoline-based-dihydropyridopyrimidine-and-dihydropyrazolopyridine-hybrids
#7
Daniel Insuasty, Rodrigo Abonia, Braulio Insuasty, Jairo Quiroga, Kenneth K Laali, Manuel Nogueras, Justo Cobo
An efficient, catalyst-free and one-pot three-component procedure for the synthesis of novel and nitrogen rich dihydropyrido[2,3-d]pyrimidines and dihydro-1H-pyrazolo[3,4-b]pyridines bearing a quinoline pharmacophore fragment is provided. Reactions proceeded in DMF under microwave irradiation of three-component mixtures of formyl-quinoline derivatives, primary heterocyclic amines and cyclic 1,3-diketones. Interestingly, when conventional heating at reflux was used for the starting 5-amino-1-phenylpyrazole, the corresponding aromatized pyrazolopyridines were obtained as the main products...
July 19, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28722040/a-new-set-of-cd-ii-coordination-polymers-with-mixed-ligands-of-dicarboxylate-and-pyridyl-substituted-diaminotriazine-selective-sorption-towards-co2-and-cationic-dyes
#8
Santanu Chand, Syed Meheboob Elahi, Arun Pal, Madhab C Das
On the basis of a mixed ligand system of L(NH2)2 (6-(pyridin-4-yl)-1,3,5-triazine-2,4-diamine) and dicarboxylic acids, three new Cd(ii) coordination polymers viz. {[Cd0.5(tdc)0.5(L(NH2)2)0.5(H2O)]·DMF·H2O}n (1), {[Cd0.5(bdc)0.5(L(NH2)2)(H2O)]·DMF·H2O}n (2), and {[Cd(ipa)(L(NH2)2)(DMF)]·H2O}n (3) (tdcH2 = thiophene-2,5-dicarboxylic acid, bdcH2 = benzene-1,4-dicarboxylic acid, ipaH2 = benzene-1,3-dicarboxylic acid) were synthesized under diverse reaction conditions and characterized by single crystal X-ray diffraction, PXRD, elemental analysis, IR spectroscopy and TGA...
July 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28719969/dmf-as-an-additive-in-two-step-spin-coating-method-for-20-conversion-efficiency-perovskite-solar-cells
#9
Jionghua Wu, Xin Xu, Yanhong Zhao, Jiangjian Shi, Yuzhuan Xu, Yanhong Luo, Dongmei Li, Huijue Wu, Qingbo Meng
DMF as additive has been employed in FAI/MAI/IPA (FA= CH2 (NH2)2, MA=CH3NH3, IPA is isopropanol) solution for two-step multi-cycle spin coating method in order to prepare high quality FAxMA1-xPbI2.55Br0.45 perovskite films. Further investigation reveals that the existence of DMF in the FAI/MAI/IPA solution can facilitate perovskite conversion, improve the film morphology and reduce crystal defects, thus enhance charge transfer efficiency. By optimization toward the DMF amount and spin coating cycles, compact, pinhole-free perovskite films are obtained...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718827/synthesis-of-2h-chromenones-from-salicylaldehydes-and-arylacetonitriles
#10
Chengcai Li, Hailin Zhu, Hang Zhang, Yongfeng Yang, Feng Wang
An efficient and convenient protocol for the synthesis of 2H-chromenones has been developed. In the presence of (t)BuOK in DMF, good to excellent yields of various chromenones were obtained from the corresponding salicylaldehydes and arylacetonitriles. No protection of inert gas atmosphere is required here.
July 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28718476/strong-ferromagnetic-exchange-coupling-in-a-ni-cluster-mediated-through-an-air-stable-tetrazine-based-radical-anion
#11
Maykon A Lemes, Gabriel Brunet, Amélie Pialat, Liviu Ungur, Ilia Korobkov, Muralee Murugesu
A planar tetradentate 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (BpymTz) templating chelate affords the formation of an unprecedented BpymTz˙(-) radical anion bridged {Ni} complex. Detailed magnetic measurements performed on the isolated air stable [Ni(BpymTz˙(-))Cl6(DMF)8]Cl·0.5(H2O) compound reveal strong ferromagnetic Ni(II)-BpymTz˙(-) interactions with a coupling constant of J = 98.84 cm(-1).
July 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28717213/ferroelectric-paraelectric-transition-in-a-membrane-with-quenched-induced-%C3%AE-phase-of-pvdf
#12
O García-Zaldívar, T Escamilla-Díaz, M Ramírez-Cardona, M A Hernández-Landaverde, R Ramírez-Bon, J M Yañez-Limón, F Calderón-Piñar
The stabilization of δ-phase of poly(vinylidene fluoride) PVDF in a 14 µm-thickness ferroelectric membrane is achieved by a simple route based on the use of a dimethylformamide (DMF)/acetone solvent, in which the application of external electric field is not required. X-ray diffraction and calorimetric experiments on heating reveal that, at 154 °C, the original mixture between ferroelectric δ-phase and paraelectric α-phase transits to a system with only this latter phase in the crystalline fraction. A gradual and slight increment of amorphous fraction up to the melting at 161 °C is also observed...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714675/construction-of-highly-porous-pillared-metal-organic-frameworks-rational-synthesis-structure-and-gas-sorption-properties
#13
Hui-Fang Zhou, Bo Liu, Hai-Hua Wang, Lei Hou, Wen-Yan Zhang, Yao-Yu Wang
Different from the conventional method to construct pillared-layer metal-organic frameworks (MOFs) by using mixed bipyridyl and dicarboxylate ligands, herein, we present a new approach to build pillared-layer frameworks based on the pyridyldicarboxylate ligands which were predesigned with a certain shape. As exemplified, the ligands of 3-(2',5'-dicarboxyphenyl)benzoic acid (H3dbba) and 3-(2',5'-dicarboxylphenyl)pyridine acid (H2dcpy) were selected and employed to construct three pillared-layer MOFs, [Zn3(dbba)2(bipy)(DMF)]·3DMF·4H2O (1) (bipy = 4,4'-bipyridine), and a pair of crystal polymorphs of [Zn(dcpy)]·1...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28709939/transdermal-delivery-of-dimethyl-fumarate-for-alzheimer-s-disease-effect-of-penetration-enhancers
#14
Dina Ameen, Bozena Michniak-Kohn
Dimethyl fumarate (DMF) is an orally administered drug with neuroprotective and immunomodulatory activities. It has potential uses in the treatment of neurodegenerative diseases such as Alzheimer's disease (AD). The objective of this study was to investigate the feasibility of transdermal delivery of DMF by studying the effect of different penetration enhancers on the skin permeation of DMF. The permeation of saturated DMF solutions was investigated in propylene glycol (PG) with varying concentrations of each of the following enhancers: Polysorbate 80 (T80), N-methyl pyrrolidone (NMP), laurocapram (Azone(®)) (Az), Transcutol P (Tc), Terpineol (Terp), and cineole (Cin) using vertical Franz diffusion cells and human cadaver skin...
July 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28707307/fine-tuning-of-mof-505-analogues-to-reduce-low-pressure-methane-uptake-and-enhance-methane-working-capacity
#15
Junfeng Bai, Mingxing Zhang, Wei Zhou, Tony Pham, Katherine A Forrest, Wenlong Liu, Yabing He, Hui Wu, Taner Yildirim, Banglin Chen, Brian Space, Yi Pan, Michael J Zaworotko
We present a crystal engineering strategy to fine tune the pore chemistry and CH4 storage performance of a family of isomorphous MOFs based upon PCN-14. These MOFs exhibit similar pore size, pore surface and surface area (around 3000 m2 g-1) and were prepared with the goal to enhance CH4 working capacity. [Cu2(L2)(H2O)2]n (NJU-Bai 41: NJU-Bai for Nanjing University Bai's group), [Cu2(L3)(H2O)2]n (NJU-Bai 42) and [Cu2(L4)(DMF)2]n (NJU-Bai 43) were prepared and we observed that the CH4 volumetric working capacity and volumetric uptake values are impacted by subtle changes in structure and chemistry...
July 13, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28702060/oral-health-status-salivary-ph-status-and-streptococcus-mutans-counts-in-dental-plaques-and-saliva-of-children-with-acute-lymphoblastic-leukemia
#16
Romina Mazaheri, Ebrahim Jabbarifar, Elnaz Ghasemi, Elahe Akkafzadeh, Elmira Poursaeid
BACKGROUND: Acute lymphoblastic leukemia (ALL), accounting for 23% of all malignancies in children, is the most prevalent pediatric malignancy. This study compared dental caries, oral hygiene status, salivary pH, and Streptococcus mutans counts in dental plaques and saliva of children with leukemia with those of healthy controls. MATERIALS AND METHODS: This case-control cross-sectional study assessed 32 children with ALL and 32 healthy children (4-9-year-old) for gingival bleeding index (GBI), decayed, missing, and filled/decayed, missing, and filled surfaces (DMF/dmfs), and plaque index (PI)...
May 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28698065/the-effect-of-poly-lactic-co-glycolic-acid-composition-on-the-mechanical-properties-of-electrospun-fibrous-mats
#17
X Liu, J Aho, S Baldursdottir, A Bohr, H Qu, L P Christensen, J Rantanen, M Yang
The aim of this study was to investigate the influence of polymer molecular structure on the electrospinnability and mechanical properties of electrospun fibrous mats (EFMs). Polymers with similar molecular weight but different composition ratios (lactic acid (LA) and glycolic acid (GA)) were dissolved in binary mixtures of N,N-dimethylformamide (DMF) and tetrahydrofuran (THF). The intrinsic viscosity and rheological properties of polymer solutions were investigated prior to electrospinning. The morphology and mechanical properties of the resulting EFMs were characterized by scanning electron microscope (SEM) and dynamic mechanical analysis (DMA)...
July 8, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28696702/highly-conductive-polypropylene-graphene-nonwoven-composite-via-interface-engineering
#18
Qin Pan, Eunkyoung Shim, Behnam Pourdeyhimi, Wei Gao
Here we report a highly conductive polypropylene-graphene nonwoven composite via direct coating of polypropylene (PP) nonwoven fabrics with graphene oxide (GO) dispersions in N, N-dimethyl formamide (DMF), followed by the chemical reduction of GO with hydroiodic acid (HI). GO as an amphiphilic macromolecule can be dispersed in DMF homogeneously at a concentration of 5 mg/mL, which has much lower surface tension (37.5 mN/m) than that of GO in water (72.9 mN/m, at 5 mg/mL). The hydrophobic PP nonwoven has a surface energy of 30...
July 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28692088/the-influence-of-coordination-modes-and-active-sites-of-a-5-triazol-1-yl-nicotinic-ligand-on-the-assembly-of-diverse-mofs
#19
Yang-Tian Yan, Si-Si Zhang, Guo-Ping Yang, Wen-Yan Zhang, Fang Zhang, Feng Cao, Rui-Feng Yang, Yao-Yu Wang
Six new complexes based on 5-(triazol-1-yl)nicotinic acid (HL), namely [Cu2(L)3(H2O)(OH)]n (1), [Co(L)2(H2O)2]n (2), [Mn(L)2(H2O)2]n (3), {[Co(L)(H2O)0.5(DMF)0.5(NO3)0.5]·(Cl)0.5·DMF·2H2O}n (4), {[Cu(L)(O)0.5]·CH3OH·2.5H2O}n (5) and {[Co2(L)4(H2O)]·2DMA·2H2O}n (6), were synthesized under hydro(solvo)thermal conditions. The L(-) ligand in 1-6 reveals various coordination modes and forms diverse secondary building units (SBUs) in the final structures. Complex 1 shows a 2D layered structure with a rare (3,8)-connected topology based on tetranuclear [Cu4(COO)6(H2O)2(OH)2N6] SBUs...
July 10, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28691579/lipoxin-a4-suppresses-estrogen-induced-epithelial-mesenchymal-transition-via-alxr-dependent-manner-in-endometriosis
#20
Rong-Feng Wu, Zhi-Xiong Huang, Jing Ran, Song-Juan Dai, Dian-Chao Lin, Tai-Wei Ng, Qing-Xi Chen, Qiong-Hua Chen
OBJECTIVE: Epithelial-mesenchymal transition (EMT) is essential for embryogenesis, fibrosis, and tumor metastasis. Aberrant EMT phenomenon has been reported in endometriotic tissues of patients with endometriosis (EM). In this study, we further investigated the molecular mechanism of which lipoxin A4 (LXA4) suppresses estrogen (E2)-induced EMT in EM. STUDY DESIGN: The EMT markers were analyzed by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot in eutopic endometrial epithelial cells (EECs) or investigated by immunohistochemistry and qRT-PCR in endometriotic lesion of EM mice...
January 1, 2017: Reproductive Sciences
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