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https://www.readbyqxmd.com/read/28640581/molecular-insight-of-water-desalination-across-multilayer-graphene-oxide-membranes
#1
Bo Chen, Haifeng Jiang, Xiang Liu, Xuejiao Hu
Transport of ionic solutions through graphene oxide (GO) membranes is a complicated issue because the complex and tortuous structure inside make it very hard to clarify. Using molecular dynamics (MD) simulations, we investigated the mechanism of water transport and ions movement across the multilayer graphene oxide. The significant flow rate is considerably influenced by the structural parameters of GO membranes. Due to the size effect on shrunken real flow area, there is disagreement between classical continuum model and nano-scaled flow...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635557/cellular-immune-responses-of-older-adults-to-four-influenza-vaccines-results-of-a-randomized-controlled-comparison
#2
Arun Kumar, Janet E McElhaney, Lisa Walrond, Terry D Cyr, Shahzma Merani, Tobias R Kollmann, Scott A Halperin, David W Scheifele
Cellular immunity is important for protection against the serious complications of influenza in older adults. As it is unclear if newer influenza vaccines elicit greater cellular responses than standard vaccines, we compared responses to two standard and two newer licensed trivalent inactivated vaccines (TIVs) in a randomized trial in older adults. Non-frail adults ≥65 years old were randomly assigned to receive standard subunit, MF59-adjuvanted subunit, standard split-virus or intradermal split-virus TIV...
June 21, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28628333/coupling-targeted-and-untargeted-mass-spectrometry-for-metabolome-microbiome-wide-association-studies-of-human-fecal-samples
#3
Alexey V Melnik, Pieter C Dorrestein, Ricardo R da Silva, Embriette R Hyde, Alexander A Aksenov, Fernando Vargas, Amina Bouslimani, Ivan Protsyuk, Alan Jarmusch, Anupriya Tripathi, Theodore Alexandrov, Rob Knight
Increasing appreciation of the gut microbiome's role in health motivates understanding the molecular composition of human feces. To analyze such complex samples, we developed a platform coupling targeted and untargeted metabolomics. The approach is facilitated through split flow from one UPLC, joint timing triggered by contact closure relays and a script to retrieve the data. It is designed to detect specific metabolites of interest with high sensitivity, allows for correction of targeted information, enables better quantitation thus providing an advanced analytical tool for exploratory studies...
June 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28626741/isolation-and-identification-of-two-phenolic-compounds-from-a-moderately-cytotoxic-fraction-of-cousinia-verbascifolia-bunge
#4
Seyed Ebrahim Sajjadi, Mustafa Ghanadian, Mehrangiz Haghighi
BACKGROUND: Little information is available about chemical components of the Cousinia genus. A primary cytotoxicity screening on Cousinia verbascifolia showed moderate cytotoxic activity against OVCAR-3 ovarian and HT-29 colon cancer cells. Therefore, the aim of this study is a phytochemical investigation to identify the compounds responsible for this bioactivity. MATERIALS AND METHODS: Extraction was done through percolation and fractionations by reverse phase column chromatography and normal column chromatography...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28619592/hyphenation-of-ultra-high-performance-supercritical-fluid-chromatography-with-atmospheric-pressure-chemical-ionisation-high-resolution-mass-spectrometry-part-1-study-of-the-coupling-parameters-for-the-analysis-of-natural-non-polar-compounds
#5
Johanna Duval, Cyril Colas, Virginie Pecher, Marion Poujol, Jean-François Tranchant, Eric Lesellier
An analytical method based on Ultra-High-Performance Supercritical Fluid Chromatography (UHPSFC) coupled with Atmospheric Pressure Chemical Ionization - High-resolution mass spectrometry (APCI-Q-TOF-HRMS) was developed for compounds screening from oily samples. The hyphenation was made using a commercial UHPLC device coupled to a CO2 pump in order to perform the chromatographic analysis. An adaptation of the injection system for compressible fluids was accomplished for this coupling: this modification of the injection sequence was achieved to prevent unusual variations of the injected volume related to the use of a compressible fluid...
June 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28611871/efficient-extraction-of-oil-from-droplet-microfluidic-emulsions
#6
J R Haliburton, S C Kim, I C Clark, R A Sperling, D A Weitz, A R Abate
Droplet microfluidic techniques can perform large numbers of single molecule and cell reactions but often require controlled, periodic flow to merge, split, and sort droplets. Here, we describe a simple method to convert aperiodic flows into periodic ones. Using an oil extraction module, we efficiently remove oil from emulsions to readjust the droplet volume fraction, velocity, and packing, producing periodic flows. The extractor acts as a universal adaptor to connect microfluidic modules that do not operate under identical flow conditions, such as droplet generators, incubators, and merger devices...
May 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28611119/turbulent-kinetic-energy-assessed-by-multipoint-4-dimensional-flow-magnetic-resonance-imaging-provides-additional-information-relative-to-echocardiography-for-the-determination-of-aortic-stenosis-severity
#7
Christian Binter, Alexander Gotschy, Simon H Sündermann, Michelle Frank, Felix C Tanner, Thomas F Lüscher, Robert Manka, Sebastian Kozerke
BACKGROUND: Turbulent kinetic energy (TKE), assessed by 4-dimensional (4D) flow magnetic resonance imaging, is a measure of energy loss in disturbed flow as it occurs, for instance, in aortic stenosis (AS). This work investigates the additional information provided by quantifying TKE for the assessment of AS severity in comparison to clinical echocardiographic measures. METHODS AND RESULTS: Fifty-one patients with AS (67±15 years, 20 female) and 10 healthy age-matched controls (69±5 years, 5 female) were prospectively enrolled to undergo multipoint 4D flow magnetic resonance imaging...
June 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28591459/simulating-head-recovery-and-intermittent-discharge-in-free-flowing-wells
#8
Ferenc Székely
Modeling of the head recovery (buildup) in and intermittent operation of flowing wells lacks rigorous analytical tools. Presently different methods are applied in discharging and recovery phases. The presented reliable approximate solution considers a continuous free flow process and time variant screen loss parameters. The latter are temporarily set to large value to prevent inflow into the well bore during the single recovery or in repeated shut down periods. This method is called as screen loss control or SLC technique and is verified by means of comparative analysis with the constant rate pumping-recovery test simulated in leaky aquifer...
June 7, 2017: Ground Water
https://www.readbyqxmd.com/read/28584884/population-splitting-of-rodlike-swimmers-in-couette-flow
#9
Hossein Nili, Masoud Kheyri, Javad Abazari, Ali Fahimniya, Ali Naji
We present a quantitative analysis on the response of a dilute active suspension of self-propelled rods (swimmers) in a planar channel subjected to an imposed shear flow. To best capture the salient features of the shear-induced effects, we consider the case of an imposed Couette flow, providing a constant shear rate across the channel. We argue that the steady-state behavior of swimmers can be understood in the light of a population splitting phenomenon, occurring as the shear rate exceeds a certain threshold, initiating the reversal of the swimming direction for a finite fraction of swimmers from down- to upstream or vice versa, depending on the swimmer position within the channel...
June 6, 2017: Soft Matter
https://www.readbyqxmd.com/read/28579358/the-impact-of-t1-renal-tumor-characteristics-on-baseline-renal-function-in-patients-undergoing-partial-nephrectomy-a-renal-scan-based-objective-assessment
#10
F Porpiglia, R Autorino, C Fiori, H Zargar, D Amparore, R Bertolo
INTRODUCTION AND OBJECTIVES: To objectively assess the impact of renal tumors characteristics and other measurable factors on baseline renal function in patient undergoing partial nephrectomy (PN). METHODS: Patients who underwent laparoscopic PN for a T1 renal mass between 2012 and 2016 and who also had a mercapto-acetyltriglycine renal scan prior to surgery were retrieved from a single institution prospectively-collected database. Split renal function (SRF) and Effective Renal Plasma Flow (ERPF) for both the operated kidney and the unaffected contralateral were calculated...
May 26, 2017: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28573277/synthesis-of-batao2n-oxynitride-from-ba-rich-oxide-precursor-for-construction-of-visible-light-driven-z-scheme-overall-water-splitting
#11
Beibei Dong, Yu Qi, Junyan Cui, Baodan Liu, Fengqiang Xiong, Xin Jiang, Zheng Li, Yejun Xiao, Fuxiang Zhang, Can Li
Barium tantalum oxynitride (BaTaO2N) with an absorption edge of ca. 660 nm is one of the most promising photocatalysts for solar water splitting, and is usually synthesized by nitriding a mixture of Ba and Ta-containing compounds with a Ba/Ta molar ratio of unity under ammonia flow at high temperature, usually causing a high density of defect sites. Herein, we introduce a novel synthesis method for BaTaO2N (BTON) by employing Ba-rich LiBa4Ta3O12, prepared by a flux method, as a precursor of nitridation. As a comparison, BaTaOx was prepared by conventional solid state reaction and used as the precursor...
June 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28571412/apparatus-for-the-investigation-of-high-temperature-high-pressure-gas-phase-heterogeneous-catalytic-and-photo-catalytic-materials
#12
Jason F Alvino, Trystan Bennett, Rantej Kler, Rohan J Hudson, Julien Aupoil, Thomas Nann, Vladimir B Golovko, Gunther G Andersson, Gregory F Metha
A high-temperature, high-pressure, pulsed-gas sampling and detection system has been developed for testing new catalytic and photocatalytic materials for the production of solar fuels. The reactor is fitted with a sapphire window to allow the irradiation of photocatalytic samples from a lamp or solar simulator light source. The reactor has a volume of only 3.80 ml allowing for the investigation of very small quantities of a catalytic material, down to 1 mg. The stainless steel construction allows the cell to be heated to 350 °C and can withstand pressures up to 27 bar, limited only by the sapphire window...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28570453/anterolateral-thigh-flap-for-reconstruction-in-postburn-axillary-contractures
#13
Hung Chang Chen, Katie P Wu, Cheng-I Yen, Yen-Chang Hsiao, Shih-Yi Yang, Jui-Yung Yang, Cheng-Jen Chang, Shu-Yin Chang, Shiow-Shuh Chuang
BACKGROUND: Reconstruction of postburn axillary contractures is difficult and particularly challenging without healthy adjacent soft tissue for axillary scar resurfacing. In this case, a free soft-tissue transfer is among the best treatment options. Here, we describe our experience with free anterolateral thigh (ALT) flap for reconstruction in postburn axillary contractures. METHODS: We enrolled 10 patients with postburn axillary contractures from August 2003 to July 2015...
May 31, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28554044/in-droplet-cell-concentration-using-dielectrophoresis
#14
Song-I Han, Hyun Soo Kim, Arum Han
Concentrating cells or adjusting the concentration of cells are one of the most fundamental steps in cell biology experiments, and are typically achieved through centrifugation. However this step is challenging to implement in droplet microfluidics. Here we present an in-droplet cell concentrator that operates by first gradually focusing cells inside a droplet to one side of the droplet using negative dielectrophoresis (nDEP), followed by asymmetric droplet splitting using a Y-shaped junction, resulting in two daughter droplets, one of which containing all or most of the cells...
May 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28532836/follicular-dynamics-ovarian-vascularity-and-luteal-development-in-mares-with-early-or-late-postpartum-ovulation
#15
Kleber Menegon Lemes, Luciano Andrade Silva, Maria Augusta Alonso, Eneiva Carla Carvalho Celeghini, Guilherme Pugliesi, Henrique Fulaneti Carvalho, Fernanda Jordão Affonso, Daniela Franco Silva, Ticiano Guimarães Leite, Rubens Paes de Arruda
Follicular development and deviation processes during the postpartum period are not completely known in horses. Thus, we aimed to study the characteristics of follicular dynamics and ovarian vascular perfusion during the postpartum period in mares that demonstrated estrous behavior and had early (<10 days) or late (≥10 days) postpartum ovulation. Ten mares were scanned daily by transrectal ultrasonography from the first day postpartum (d1) to the sixteenth day after the first postpartum ovulation (D0 = ovulation)...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28530789/insight-into-charge-separation-in-wo3-bivo4-heterojunction-for-solar-water-splitting
#16
Sang Youn Chae, Chang Soo Lee, Hyejin Jung, Oh-Shim Joo, Byoung Koun Min, Jong Hak Kim, Yun Jeong Hwang
Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid...
May 31, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28522839/fast-diffusion-of-domesticated-maize-to-temperate-zones
#17
Xiaolong Li, Yinqiao Jian, Chuanxiao Xie, Jun Wu, Yunbi Xu, Cheng Zou
Adaptation to a temperate climate was a prerequisite for the spread of maize across a broad geographical range. To explicitly explore the demographic process underlying maize adaptation, we used a diffusion-based method to model the differentiation between temperate and tropical populations using the Non-Stiff Stalk group as a proxy for temperate maize. Based on multiple sequential Markovian coalescent approaches, we estimate that tropical and temperate maize diverged approximately 3'000 to 5'000 years ago and the population size shrank after the split...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515658/flow-visualisation-of-a-normal-shock-impinging-over-a-rounded-contour-bump-in-a-mach-1-3-free-stream
#18
Kin Hing Lo, Konstantinos Kontis
ABSTRACT: An experimental study has been conducted to visualise the instantaneous streamwise and spanwise flow patterns of a normal shock wave impinging over a rounded contour bump in a Mach 1.3 free-stream. A quartz-made transparent shock generator was used, so that instantaneous images could be captured during the oil-flow visualisation experiments. Fluorescent oil with three different colours was used in the surface oil-flow visualisation experiment to enhance the visualisation of flow mixing and complicated flow features that present in the flow field...
2017: Journal of Visualization
https://www.readbyqxmd.com/read/28513151/acoustophoretic-mobility-and-its-role-in-optimizing-acoustofluidic-separations
#19
Philip Stephen Williams, Michel Martin, Mauricio Hoyos
In the separation sciences, sample species are separated according to their physicochemical properties, the nature of the selective field, and, if present, the properties of the medium in which they are dissolved or suspended. Separations may be carried out on a continuous basis in microfluidic devices or split-flow thin channel (SPLITT) devices by selectively transporting species in a direction transverse to the direction of flow of the suspending fluid. Separation is achieved in the so-called transport mode according to relative differences in mobility of the species under the influence of the applied field...
June 1, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28504262/density-structure-of-earth-s-lowermost-mantle-from-stoneley-mode-splitting-observations
#20
Paula Koelemeijer, Arwen Deuss, Jeroen Ritsema
Advances in our understanding of Earth's thermal evolution and the style of mantle convection rely on robust seismological constraints on lateral variations of density. The large-low-shear-wave velocity provinces (LLSVPs) atop the core-mantle boundary beneath Africa and the Pacific are the largest structures in the lower mantle, and hence severely affect the convective flow. Here, we show that anomalous splitting of Stoneley modes, a unique class of free oscillations that are perturbed primarily by velocity and density variations at the core-mantle boundary, is explained best when the overall density of the LLSVPs is lower than the surrounding mantle...
May 15, 2017: Nature Communications
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