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Hiromitsu Maeda, Yuka Takeda, Yohei Haketa, Yuta Morimoto, Nobuhiro Yasuda
π-Extended nitro-substituted dipyrrolylphenol derivatives were synthesized, providing π-electronic anions upon deprotonation and stabilization of the phenolate (phenoxide) moiety by the pyrrole NH, which served as a hydrogen-bonding donor. Ion-pairing assemblies of the deprotonated anions were formed in the solid state and as mesophases. In the solid state, the extended π-plane is more suitable to form charge-by-charge assemblies in combination with tetraalkylammonium cations with highly anisotropic orientations through its more efficient stacking...
April 18, 2018: Chemistry: a European Journal
YoungMi Lee, Jinwoo Park, Byung Deok Yu, Suklyun Hong, Min-Cherl Jung, Masakazu Nakamura
To understand the instability of Sn-based perovskite, CH3 NH3 SnI3 , photoelectron spectroscopy with the synchrotron radiation and theoretical calculations such as density functional theory and ab-initio molecular dynamics were performed. From these experimental and theoretical works, we found the crucial changes of surface-chemical states, the broken chemical bondings in Sn-I, and the depletion of a CH3 -NH3 molecule in the surface region. The material instability origin of Sn-based perovskite can be explained by the chemical state instability in the surface...
April 18, 2018: Journal of Physical Chemistry Letters
Patti M Johnstone, Kelly R Yeager, Marnie L Pomeroy, Nicole Hawk
BACKGROUND: Open-fit domes (OFDs) coupled with behind-the-ear (BTE) hearing aids were designed for adult listeners with moderate-to-severe bilateral high-frequency hearing loss (BHFL) with little to no concurrent loss in the lower frequencies. Adult research shows that BHFL degrades sound localization accuracy (SLA) and that BTE hearing aids with conventional earmolds (CEs) make matters worse. In contrast, research has shown that OFDs enhance spatial hearing percepts in adults with BHFL...
April 2018: Journal of the American Academy of Audiology
Hao Zhou, Weihao Chen, Zhiyuan Chen
Pd/Norbornene cocatalyzed tandem C-H activation/annulation reactions of free NH-sulfoximines with aryl iodides to produce diverse polyheterocyclic sulfoximines in highly chemoselective models are reported. The reaction tolerated a broad range of functional groups under external oxidant-free conditions. The preliminary mechanistic studies using density functional theory (DFT) calculations highlighted the key role of a PdIV intermediate.
April 17, 2018: Organic Letters
Dan Cheng, Wensheng Cai, Xueguang Shao
Investigating the interaction between oligopeptide and water is essential for understanding the structure, dynamics and function of proteins. Temperature-dependent near-infrared (NIR) spectroscopy and independent component analysis (ICA) were employed to study the interaction between oligopeptide and water in aqueous solution. The NIR spectra of two homo-oligopeptides, penta-aspartic acid (D5 ) and penta-lysine (K5 ), in aqueous solution of different concentration were measured at different temperature (30-90 ℃)...
January 1, 2018: Applied Spectroscopy
Qian Liang, Sainan Cui, Changhai Liu, Song Xu, Chao Yao, Zhongyu Li
A novel class of CdS@UIO-66-NH2 core shell heterojunction was fabricated by the facile in-situ solvothermal method. Characterizations show that porous UIO-66-NH2 shell not only allows the visible light to be absorbed on CdS nanorod core, but also provides abundant catalytic active sites as well as an intimate heterojunction interface between UIO-66-NH2 shell and CdS nanorod core. By taking advantage of this property, the core-shell composite presents highly solar-driven photocatalytic performance compared with pristine UIO-66-NH2 and CdS nanorod for the degradation of organic dyes including malachite green (MG) and methyl orange (MO), and displays superior photostability after four recycles...
April 2, 2018: Journal of Colloid and Interface Science
Pingxiu Tang, Rong Wang, Zilin Chen
The highly stability and other properties of Zr(IV)-based metal organic frameworks(MOFs) make it a promising choice for chromatographic separation, while the application in open-tubular capillary electrochromatography (OT-CEC) separation has not been explored yet. Herein, we report the first example of the in-situ growth of UiO-66-NH2 onto the capillary for open-tubular capillary electrochromatography. UiO-66-NH2 consists of ZrCl4 and 2-amino-1,4-benzenedicarboxylic acid, which is highly porous and stable in a variety of solvents...
April 16, 2018: Electrophoresis
Quan Xu, Wenjing Yang, Shitong Cui, Jason Street, Yan Luo
Ce-Mn/TiO2 catalyst prepared using a simple impregnation method demonstrated a better low-temperature selective catalytic reduction of NO with NH3 (NH3 -SCR) activity in comparison with the sol-gel method. The Ce-Mn/TiO2 catalyst loading with 20% Ce had the best low-temperature activity and achieved a NO conversion rate higher than 90% at 140-260°C with a 99.7% NO conversion rate at 180°C. The Ce-Mn/TiO2 catalyst only had a 6% NO conversion rate decrease after 100 ppm of SO2 was added to the stream. When SO2 was removed from the stream, the catalyst was able to recover completely...
March 2018: Royal Society Open Science
Shuo Yu, Min Wang, Xingjun Guo, Renyi Qin
BACKGROUND Inflammation plays an important role in initiation and development of severe acute pancreatitis (SAP). Curcumin exerts potent anti-inflammatory effects in many diseases, including acute pancreatitis. However, the specific molecular mechanisms are not clear. MATERIAL AND METHODS Intra-biliopancreatic duct injection of taurocholate was used to establish an animal model of SAP. Curcumin was administrated to animals as pre-treatments. Concentrations of cytokines in serum and ascites were measured by enzyme-linked immunosorbent assay (ELISA)...
April 16, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Mehran Bozorgi, Saeed Abbasizadeh, Faranak Samani, Seyyed Ebrahim Mousavi
The performance of synthesized cast and electrospun polyvinyl alcohol/chitosan/zinc oxide/aminopropyltriethoxylsilane (PVA/chitosan/ZnO-APTES) nano-adsorbents were compared in removal of Cd(II) and Ni(II) ions from wastewater. The adsorbents were characterized by SEM, BET, FTIR and TGA analyses. Furthermore, the swelling investigations were carried out to study the adsorbent stability in aqueous solution. The effect of several parameters such as contents of ZnO-NH2 , contact time, initial Cd(II) and Ni(II) concentration and temperature on the adsorption capacity was investigated in a batch mode...
April 14, 2018: Environmental Science and Pollution Research International
Atif Muhmood, Shubiao Wu, Jiaxin Lu, Zeeshan Ajmal, Hongzhen Luo, Renjie Dong
The aim of this study was to assess the potential of struvite precipitation to recover nutrients from anaerobically-processed poultry slurry and struvite's interactions with heavy metals (Zn, Cu, Pb, Cr, and Ni) and pathogens (total coliforms and Escherichia coli). The impacts of pH, Mg, N, and P molar proportion, reaction time, and mixing rate and duration were explored to determine the optimal conditions for nutrient recovery through struvite precipitation. A pH range of 9.5 to 10.5, was ideal for P and N removal and recovery, with a molar ratio of 1:1:1 for Mg:N:P...
April 12, 2018: Science of the Total Environment
Arianna Tota, Sahra St John-Campbell, Edward L Briggs, Gala Ogalla Estévez, Michelle Afonso, Leonardo Degennaro, Renzo Luisi, James A Bull
Aryl thiols can be selectively converted to sulfonimidates or sulfonamides with three new S-X connections being made selectively in one pot. Using hypervalent iodine reagents in the presence of ammonium carbamate, NH- and O-groups are transferred under mild and practical conditions. Reducing the loading of ammonium carbamate changed the product distribution, converting the sulfonimidate to the sulfonamide. Studies into the possible intermediate species are presented, suggesting that multiple pathways may be possible via sulfinate esters, or related intermediates, with each species forming the same products...
April 13, 2018: Organic Letters
Oleg V'yunov, Anatolii Belous, Sofiia Kobylianska, Leonid Kovalenko
The effect of starting reagents (PbI2:{CH3 NH3 I + CH3 NH3 Cl}) with different ratios in raw solutions on the microstructure of films of organic-inorganic perovskites CH3 NH3 PbI3-x Clx , as well as on the electrical properties, has been investigated. It was found that the crystallinity is increased sharply when the ratio of the starting reagents increases from 1:1 to 1:2 and is changed slightly with a further increase of ratio to 1:3. It is shown that when the ratio of starting reagents varies, the morphology of the films changes; at a ratio of 1:1, the films consist of needle-like particles, and when the ratio is increased, particles become roundish and then faceted...
April 12, 2018: Nanoscale Research Letters
Kentaro Takahashi, Stelios Pavlidis, Francois Ng Kee Kwong, Uruj Hoda, Christos Rossios, Kai Sun, Matthew Loza, Fred Baribaud, Pascal Chanez, Steve J Fowler, Ildiko Horvath, Paolo Montuschi, Florian Singer, Jacek Musial, Barbro Dahlen, Sven-Eric Dahlen, N Krug, Thomas Sandstrom, Dominic E Shaw, Rene Lutter, Per Bakke, Louise J Fleming, Peter H Howarth, Massimo Caruso, Ana R Sousa, Julie Corfield, Charles Auffray, Bertrand De Meulder, Diane Lefaudeux, Ratko Djukanovic, Peter J Sterk, Yike Guo, Ian M Adcock, Kian Fan Chung
Background: Severe asthma patients with a significant smoking history have airflow obstruction with reported neutrophilia. We hypothesise that multi-omic analysis will enable the definition of smoking and ex-smoking severe asthma molecular phenotypes. Methods: The U-BIOPRED severe asthma patients containing current-smokers (CSA), ex-smokers (ESA), non-smokers (NSA) and healthy non-smokers (NH) was examined. Blood and sputum cell counts, fractional exhaled nitric oxide and spirometry were obtained. Exploratory proteomic analysis of sputum supernatants and transcriptomic analysis of bronchial brushings, biopsies and sputum cells was performed...
April 12, 2018: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
Peter G Passias, Gregory W Poorman, Cole A Bortz, Rabia Qureshi, Bassel G Diebo, Justin C Paul, Samantha R Horn, Frank A Segreto, Alexandra Pyne, Cyrus M Jalai, Virginie Lafage, Shay Bess, Frank J Schwab, Hamid Hassanzadeh
BACKGROUND CONTEXT: With advances in the understanding of adult spinal deformity (ASD), more complex osteotomy and fusion techniques are being implemented with increasing frequency. Patients undergoing ASD corrections infrequently require extended acute care, longer inpatient stays, and are discharged to supervised care. Given the necessity of value-based health care, identification of clinical indicators for adverse discharge disposition in ASD surgeries is paramount. PURPOSE: On nationwide and surgeon-created databases, identify predictors of adverse discharge disposition after ASD surgeries and view corresponding differences in charges...
April 9, 2018: Spine Journal: Official Journal of the North American Spine Society
Ryan A Altman, Krishna Sharma, Lian G Rajewski, Paul Chester Toren, Michael J Baltezor, Mohan Pal, Somnath Narayan Karad
Opioid peptides are key regulators in cellular and intercellular physiological responses, and could be therapeutically useful for modulating several pathological conditions. Unfortunately, the use of peptide-based agonists to target centrally located opioid receptors is limited by poor physicochemical (PC), distribution, metabolic, and pharmacokinetic (DMPK) properties that restrict penetration across the blood-brain-barrier via passive diffusion. To address these problems, the present manuscript exploits fluorinated peptidomimetics to simultaneously modify PC and DMPK properties, thus facilitating entry into the central nervous system...
April 12, 2018: ACS Chemical Neuroscience
Goutam Kumar Lahiri
The present article reveals an unprecedented reactivity profile of biochemically relevant R-benzofuroxan (R=H, Me, Cl) with high structural diversity and molecular complexity on selective {Ru(acac)2} (acac=acetylacetonate) platform in conjugation with EtOH solvent mediation. This led to one-pot development of monomeric [RuIII(acac)2(L1R)] (1a-1c) (L1R = 2-nitrosoanilido derivatives) and dimeric [{RuII(acac)2}2(L2R)] (2a-2b) ((L2R=(1E,2E)-N1,N2-bis(2-nitrosophenyl)ethane-1,2-diimine derivatives) complexes with the change in metal redox...
April 12, 2018: Chemistry, An Asian Journal
Malcolm B Doupe, Jeff Poss, Peter G Norton, Allan Garland, Natalia Dik, Shauna Zinnick, Lisa M Lix
BACKGROUND: To improve care, planners require accurate information about nursing home (NH) residents and their healthcare use. We evaluated how accurately measures of resident user status and healthcare use were captured in the Minimum Data Set (MDS) versus administrative data. METHODS: This retrospective observational cohort study was conducted on all NH residents (N = 8832) from Winnipeg, Manitoba, Canada, between April 1, 2011 and March 31, 2013. Six study measures exist...
April 11, 2018: BMC Health Services Research
A A Ali, R A Forrester, P O'Connor, N J Harris
Aims The aim of this study was to present a series of patients with aseptic failure of a total ankle arthroplasty (TAA) who were treated with fusion of the hindfoot using a nail. Patients and Methods A total of 23 TAAs, in 22 patients, were revised for aseptic loosening and balloon osteolysis to a hindfoot fusion by a single surgeon (NH) between January 2012 and August 2014. The procedure was carried out without bone graft using the Phoenix, Biomet Hindfoot Arthrodesis Nail. Preoperative investigations included full blood count, CRP and ESR, and radiological investigations including plain radiographs and CT scans...
April 1, 2018: Bone & Joint Journal
C Sommer, S Rumpel, S Roy, C Farès, V Artero, M Fontecave, E Reijerse, W Lubitz
[FeFe] Hydrogenases catalyze the reversible conversion of H2 into electrons and protons. Their catalytic site, the H-cluster, contains a generic [4Fe-4S]H cluster coupled to a [2Fe]H subsite [Fe2 (ADT)(CO)3 (CN)2 ]2- , ADT = µ(SCH2 )2 NH. Heterologously expressed [FeFe] hydrogenases (apo-hydrogenase) lack the [2Fe]H unit, but this can be incorporated through artificial maturation with a synthetic precursor [Fe2 (ADT)(CO)4 (CN)2 ]2- . Maturation with a [2Fe] complex in which the essential ADT amine moiety has been replaced by CH2 (PDT = propane-dithiolate) results in a low activity enzyme with structural and spectroscopic properties similar to those of the native enzyme, but with simplified redox behavior...
April 7, 2018: Journal of Biological Inorganic Chemistry: JBIC
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