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https://www.readbyqxmd.com/read/30517017/lipidic-mesophase-embedded-palladium-nanoparticles-synthesis-and-tunable-catalysts-in-suzuki-miyaura-cross-coupling-reactions
#1
Michael Duss, Jijo J Vallooran, Livia Salvati Manni, Nicole Kieliger, Stephan Handschin, Raffaele Mezzenga, Henning J Jessen, Ehud M Landau
Lipidic cubic phases (LCPs) can reduce Pd2+-salts to palladium nanoparticles (PdNPs) of ~ 5 nm size in their confined water channels under mild conditions. The resulting PdNP-containing LCPs were used as nanoreactor scaffolds to catalyze Suzuki-Miyaura cross coupling reactions in the aqueous channels of the mesophase. To turn on catalysis, PdNP-containing LCPs are activated by swelling the aqueous channels of the lipidic framework, thereby enabling diffusion of the water-soluble substrates to the catalysts...
December 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30516783/highly-dispersed-layered-double-oxide-hollow-spheres-with-sufficient-active-sites-for-adsorption-of-methyl-blue
#2
Yingtong Zong, Kaitao Li, Rui Tian, Yanjun Lin, Chao Lu
The adsorption of dyes in contaminated water is an effective approach to solving the environmental crisis. Layered double hydroxide (LDH) and its calcinated product layered double oxide (LDO) show great potential as adsorbents. However, the conventional preparation of LDH or LDO typically suffers from aggregation and blocked active sites, hampering the adsorption efficiency of the adsorbent. Herein, three-dimensional, hollow MgFe-LDO spheres were constructed through the sacrifice of a carbon template. The hollow structure and the monodisperse state provided MgFe-LDO with sufficient microchannels and abundant active sites for adsorption...
December 5, 2018: Nanoscale
https://www.readbyqxmd.com/read/30516651/elite-rowers-demonstrate-consistent-patterns-of-hip-cartilage-damage-compared-with-matched-controls-a-t2-mapping-study
#3
Bernd Bittersohl, Chiara Benedikter, Alexander Franz, Tobias Hesper, Christoph Schleich, Gerald Antoch, Harish S Hosalkar, Rüdiger Krauspe, Christoph Zilkens
BACKGROUND: Rowing exposes the femoral head and acetabulum to high levels of repetitive abutment motion and axial loading that may put elite athletes at an increased risk for developing early hip osteoarthritis. QUESTIONS/PURPOSES: Do elite rowers demonstrate characteristic hip cartilage lesions on T2 MRI sequences compared with asymptomatic individuals who do not row? METHODS: This study included 20 asymptomatic rowers (mean age, 23 ± 3 years; nine females, 11 males) who had a minimum of 5 years of intensive (≥ 12 hours/week) training...
November 27, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/30516226/propofol-adsorption-at-the-air-water-interface-a-combined-vibrational-sum-frequency-spectroscopy-nuclear-magnetic-resonance-and-neutron-reflectometry-study
#4
Petru Niga, Petra M Hansson-Mille, Agne Swerin, Per M Claesson, Joachim Schoelkopf, Patrick A C Gane, Jing Dai, István Furó, Richard A Campbell, C Magnus Johnson
Propofol is an amphiphilic small molecule that strongly influences the function of cell membranes, yet data regarding interfacial properties of propofol remain scarce. Here we consider propofol adsorption at the air/water interface as elucidated by means of vibrational sum frequency spectroscopy (VSFS), neutron reflectometry (NR), and surface tensiometry. VSFS data show that propofol adsorbed at the air/water interface interacts with water strongly in terms of hydrogen bonding and weakly in the proximity of the hydrocarbon parts of the molecule...
December 5, 2018: Soft Matter
https://www.readbyqxmd.com/read/30516043/colorimetric-fluorescent-magnetic-nanosphere-based-multimodal-assay-platform-for-salmonella-detection
#5
Jiao Hu, Yong-Zhong Jiang, Man Tang, Ling-Ling Wu, Hai-Yan Xie, Zhi-Ling Zhang, Dai-Wen Pang
Rapid and sensitive foodborne pathogen detection assay, which can be applied in multiple fields, is essential to timely diagnosis. Herein, we proposed a multi-signal readout lateral flow immunoassay for Salmonella typhimurium (S. typhi) detection. The assay employs colorimetric-fluorescent-magnetic nanospheres (CFMNs) as labels, which possess multi-functional: target separation and enrichment, multi-signal readout and two formats of quantitation. The assay for S. typhi detection involves magnetic separation and chromatography...
December 5, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30514819/multiresponsive-polymeric-microstructures-with-encoded-predetermined-and-self-regulated-deformability
#6
Yuxing Yao, James T Waters, Anna V Shneidman, Jiaxi Cui, Xiaoguang Wang, Nikolaj K Mandsberg, Shucong Li, Anna C Balazs, Joanna Aizenberg
Dynamic functions of biological organisms often rely on arrays of actively deformable microstructures undergoing a nearly unlimited repertoire of predetermined and self-regulated reconfigurations and motions, most of which are difficult or not yet possible to achieve in synthetic systems. Here, we introduce stimuli-responsive microstructures based on liquid-crystalline elastomers (LCEs) that display a broad range of hierarchical, even mechanically unfavored deformation behaviors. By polymerizing molded prepolymer in patterned magnetic fields, we encode any desired uniform mesogen orientation into the resulting LCE microstructures, which is then read out upon heating above the nematic-isotropic transition temperature (TN-I ) as a specific prescribed deformation, such as twisting, in- and out-of-plane tilting, stretching, or contraction...
December 4, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/30513664/the-role-of-hydrogen-bonding-in-the-folding-unfolding-process-of-hydrated-lysozyme-a-review-of-recent-nmr-and-ftir-results
#7
REVIEW
Domenico Mallamace, Enza Fazio, Francesco Mallamace, Carmelo Corsaro
The biological activity of proteins depends on their three-dimensional structure, known as the native state. The main force driving the correct folding mechanism is the hydrophobic effect and when this folding kinetics is altered, aggregation phenomena intervene causing the occurrence of illnesses such as Alzheimer and Parkinson's diseases. The other important effect is performed by water molecules and by their ability to form a complex network of hydrogen bonds whose dynamics influence the mobility of protein amino acids...
November 30, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30513645/a-charge-transfer-salt-based-on-ferrocene-ferrocenium-pairs-and-keggin-type-polyoxometalates
#8
Beñat Artetxe, Amaia Iturrospe, Pablo Vitoria, Estibaliz Ruiz-Bilbao, José S Garitaonandia, Juan M Gutiérrez-Zorrilla
A new hybrid inorganic-organometallic salt has been obtained from the reaction of the Keggin-type silicotungstate anion with ferrocene in a water/methanol mixture as a result of the partial oxidation of ferrocene molecules to ferrocenium cations. Single-crystal X-ray diffraction analysis reveals the presence of four ferrocenium (FeIII ) cations and one ferrocene (FeII ) molecule per plenary Keggin anion in the crystal structure of [FeIII (Cp)₂]₄[SiW12 O40 ]·[FeII (Cp)₂]·2CH₃OH ( 1 ). Compound 1 thus constitutes the first example in the literature in which ferrocenium and ferrocene species coexist in the structure of a polyoxometalate-based salt...
November 30, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30513618/switchable-hydrophilicity-triethylamine-formation-and-synergistic-effects-of-asphaltenes-in-stabilizing-emulsions-droplets
#9
Xingang Li, Jinjian Hou, Hong Sui, Lingyu Sun, Lin Xu
In this study, SHT (switchable-hydrophilicity triethylamine, [Et₃NH]·[HCO₃]) has been synthesized and instrumentally characterized by Fourier transform⁻infrared spectroscopy (FTIR) and 13 C nuclear magnetic resonance (NMR). The operational synthesis conditions of SHT were optimized and determined at 25 °C, Et₃N/H₂O volume ratio of 1:2 and CO₂ injection rate at 300 mL/min. When it was used to extract heavy oil from unconventional oil ore, it was found that it could break maltenes-in-water emulsions...
November 30, 2018: Materials
https://www.readbyqxmd.com/read/30513431/rare-earth-element-fluxes-over-15-years-into-a-major-european-estuary-garonne-gironde-sw-france-hospital-effluents-as-a-source-of-increasing-gadolinium-anomalies
#10
Antoine Lerat-Hardy, Alexandra Coynel, Lionel Dutruch, Clément Pereto, Cécile Bossy, Teba Gil-Diaz, Marion-Justine Capdeville, Gérard Blanc, Jörg Schäfer
New and rapidly developing technologies imply the emission of emerging potentially toxic contaminants such as Rare Earth Elements (REEs). Yet, the lithology-derived quantities and anthropogenic contributions, especially from urban areas, to annual REE fluxes into fluvial-estuarine systems remain widely unknown. The Garonne River drains water from ~20% of the French land surface hosting about 5,200,000 inhabitants and two large cities. Based on long-term monitoring (2003-2017) of water discharges and dissolved REEs concentrations at the outlet of the Garonne Watershed upstream from Bordeaux, this study aims at assessing REE anomalies and evaluating temporal evolution of annual dissolved REE fluxes into the Gironde Estuary...
November 24, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30510847/non-invasive-quantification-of-tumor-blood-flow-in-prostate-cancer-using-15-o-h-2-o-pet-ct
#11
Lars P Tolbod, Maria M Nielsen, Bodil G Pedersen, Søren Høyer, Hendrik J Harms, Michael Borre, Per Borghammer, Kirsten Bouchelouche, Jørgen Frøkiær, Jens Sørensen
Tumor blood flow (TBF) measurements in prostate cancer (PCa) provide an integrative index of tumor growth, which could be important for primary diagnosis and therapy response evaluation. 15 O-water PET is the non-invasive gold standard but is technically demanding. The aim of this study was to compare the accuracy of three different non-invasive strategies with an invasively measured arterial input function (BSIF): Using image-derived input functions (IDIF) from either 1) a separate heart scan or 2) the pelvic scan or 3) a populations-based input function (PBIF)...
2018: American Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/30509974/oxygenated-mesoproterozoic-lake-revealed-through-magnetic-mineralogy
#12
Sarah P Slotznick, Nicholas L Swanson-Hysell, Erik A Sperling
Terrestrial environments have been suggested as an oxic haven for eukaryotic life and diversification during portions of the Proterozoic Eon when the ocean was dominantly anoxic. However, iron speciation and Fe/Al data from the ca. 1.1-billion-year-old Nonesuch Formation, deposited in a large lake and bearing a diverse assemblage of early eukaryotes, are interpreted to indicate persistently anoxic conditions. To shed light on these distinct hypotheses, we analyzed two drill cores spanning the transgression into the lake and its subsequent shallowing...
December 3, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/30508798/sonocatalytic-reduction-of-nitrate-using-magnetic-layered-double-hydroxide-implications-for-removal-mechanism
#13
Kien Tiek Wong, Pichiah Saravanan, In Wook Nah, Jaeyoung Choi, Chulhwan Park, Namchan Kim, Yeomin Yoon, Min Jang
In this study, magnetic layered double hydroxides (mag-LDHs) were synthesized through compositing magnetite with three different metals (Mg, Cu and Al) under ultrasound (US, 100 kHz frequency and 50 W power). For the first time, mag-LDHs were applied to sonocatalytic reduction of nitrate (NO3 - ) and the reduction mechanism were determined by conducting kinetic tests and various spectroscopic analyses. Based on the kinetic data, NO3 - reduction and the selectivity for N2 highly depends on the ratio between Mg/Al, solution pH and sonication frequency...
November 27, 2018: Chemosphere
https://www.readbyqxmd.com/read/30507107/preparation-of-%C3%AE-linolenic-acid-loaded-water-in-oil-in-water-microemulsion-and-its-potential-as-a-fluorescent-delivery-carrier-with-a-free-label
#14
Qing Li, Leping Dang, Sen Li, Xiaoxue Liu, Yun Guo, Chao Lu, Xiaohong Kou, Zhanzhong Wang
Our previous work has demonstrated that α-linolenic acid (ALA)-loaded oil-in-water (O/W) microemulsion could enhance ALA antioxidant capacity. Meanwhile, we also observed that synthesized microemulsion itself had fluorescence. In this work, we have prepared a multiple water-in-oil-in-water (W/O/W) microemulsion to further enhance ALA antioxidant capacity and activate this delivery carrier application potential with a free label. The compositions of primary water-in-oil (W/O) microemulsion were obtained using pseudo-ternary phase diagrams, and then W/O/W microemulsion was prepared adopting the "two-step heterotherm method"...
December 3, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/30506959/measuring-intra-axonal-t-2-in-white-matter-with-direction-averaged-diffusion-mri
#15
Emilie T McKinnon, Jens H Jensen
PURPOSE: To demonstrate how the T2 relaxation time of intra-axonal water (T2a ) in white matter can be measured with direction-averaged diffusion MRI. METHODS: For b-values larger than about 4000 s/mm2 , the direction-averaged diffusion MRI signal from white matter is dominated by the contribution from water within axons, which enables T2a to be estimated by acquiring data for multiple TE values and fitting a mono-exponential decay curve. If given a value of the intra-axonal diffusivity, an extension of the method allows the extra-axonal relaxation time (T2e ) to be calculated also...
December 2, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/30503215/contributions-of-a-high-fat-diet-to-alzheimer-s-disease-related-decline-a-longitudinal-behavioural-and-structural-neuroimaging-study-in-mouse-models
#16
Colleen P E Rollins, Daniel Gallino, Vincent Kong, Gülebru Ayranci, Gabriel A Devenyi, Jürgen Germann, M Mallar Chakravarty
Obesity is recognized as a significant risk factor for Alzheimer's disease (AD). Studies have supported that obesity accelerates AD-related pathophysiology and memory impairment in mouse models of AD. However, the nature of the brain structure-behaviour relationship mediating this acceleration remains unclear. In this manuscript we evaluated the impact of adolescent obesity on the brain morphology of the triple transgenic mouse model of AD (3xTg) and a non-transgenic control model of the same background strain (B6129s) using longitudinally acquired structural magnetic resonance imaging (MRI)...
November 20, 2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/30502453/the-crystalline-salt-form-of-a-selected-candidate-drug-showed-photo-thermal-and-humidity-induced-form-transitions
#17
Kalle Sigfridsson, Martin Lindsjö, Stefan Paulsson
AZ3411 was selected as a lead compound for the treatment of Inflammatory Bowel Disease (IBD). The present research aimed to perform an early pharmaceutical assessment of this NK antagonist candidate focusing on the challenging solid-state part of the evaluation. X-ray powder diffraction (XRPD), hot stage XRPD and microscopy, differential scanning calorimetry, thermogravimetrical analysis measurements, nuclear magnetic resonance spectroscopy and liquid chromatographic analysis were used to characterize AZ3411...
November 28, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/30502139/lf-1-h-nmr-t-2-relaxation-rate-as-affected-by-water-addition-nacl-and-ph-in-fresh-frozen-and-cooked-minced-hake
#18
Maureen Duflot, Isabel Sánchez-Alonso, Guillaume Duflos, Mercedes Careche
Low-Field Nuclear Magnetic Resonance of proton transverse relaxation signal (T2 ) was monitored in hake (Merluccius merluccius) mince with different thermal histories (fresh, frozen, cooked) as affected by pH, water and NaCl addition, and it was related to water holding capacity (WHC). Modifications of T2 signals were found in terms of changes in relaxation times and relative abundance of the relaxation components. The relaxation rate of the major component (1/T21 ) increased significantly upon frozen storage or pH increase, whereas water or NaCl addition had the opposite effect...
March 30, 2019: Food Chemistry
https://www.readbyqxmd.com/read/30502037/fabric-phase-sorptive-extraction-followed-by-ultra-performance-liquid-chromatography-tandem-mass-spectrometry-for-the-determination-of-fungicides-and-insecticides-in-wine
#19
L Pérez-Mayán, I Rodríguez, M Ramil, A Kabir, K G Furton, R Cela
In this work, fabric phase sorptive extraction (FPSE) is investigated for the extraction and preconcentration of ultra-trace level residues of fungicides (19 compounds) and insecticides (3 species) in wine samples. Subsequently, the preconcentrated analytes are selectively determined using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Parameters affecting the efficiency and repeatability of the extraction are evaluated in depth; moreover, the proposed method is characterized in terms of linear response range, trueness, precision and limits of quantification (LOQs)...
November 15, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/30501760/squeeze-strengthening-effect-of-silicone-oil-based-magnetorheological-fluid-with-nanometer-fe%C3%A2-o%C3%A2-addition-in-high-torque-magnetorheological-brakes
#20
Ningning Wang, Xinhua Liu, Xiaohui Zhang
With the aim of studying the squeeze-strengthening effect of silicone oil-based magnetorheological fluid (MRF) with nanometer Fe₃O₄ addition in high-torque magnetorheological (MR) brakes, the theoretical analysis of the disc brake is presented and a high-torque squeezing MRF brake with a water cooling method for heat dissipation is designed. Furthermore, an experimental system to evaluate the squeeze-strengthening performance of the MRF in the high-torque MR brake is established and relevant experiments are performed...
May 1, 2019: Journal of Nanoscience and Nanotechnology
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