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https://www.readbyqxmd.com/read/28734180/bottom-up-assembly-of-salivary-gland-microtissues-for-assessing-myoepithelial-cell-function
#1
Tugba Ozdemir, Padma Pradeepa Srinivasan, Daniel R Zakheim, Daniel A Harrington, Robert L Witt, Mary C Farach-Carson, Xinqiao Jia, Swati Pradhan-Bhatt
Myoepithelial cells are flat, stellate cells present in exocrine tissues including the salivary glands. While myoepithelial cells have been studied extensively in mammary and lacrimal gland tissues, less is known of the function of myoepithelial cells derived from human salivary glands. Several groups have isolated tumorigenic myoepithelial cells from cancer specimens, however, only one report has demonstrated isolation of normal human salivary myoepithelial cells needed for use in salivary gland tissue engineering applications...
July 14, 2017: Biomaterials
https://www.readbyqxmd.com/read/28722444/topographically-flat-nanoplasmonic-sensor-chips-for-biosensing-and-materials-science
#2
Ferry Anggoro Ardy Nugroho, Rickard Frost, Tomasz J Antosiewicz, Joachim Fritzsche, Elin M Larsson Langhammer, Christoph Langhammer
Nanoplasmonic sensors typically comprise arrangements of noble metal nanoparticles on a dielectric support. Thus, they are intrinsically characterized by surface topography with corrugations at the 10-100 nm length scale. While irrelevant in some bio- and chemosensing applications, it is also to be expected that the surface topography significantly influences the interaction between solids, fluids, nanoparticles and (bio)molecules, and the nanoplasmonic sensor surface. To address this issue, we present a wafer-scale nanolithography-based fabrication approach for high-temperature compatible, chemically inert, topographically flat, and laterally homogeneous nanoplasmonic sensor chips...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28715329/phased-array-imaging-of-complex-geometry-composite-components
#3
Alex J Brath, Francesco Simonetti, Francesco Simonetti
Progress in computational fluid dynamics (CFD) and the availability of new composite materials are driving major advances in the design of aerospace engine components which now have highly complex geometries optimized to maximize system performance. However, shape complexity poses significant challenges to traditional non-destructive evaluation (NDE) methods whose sensitivity and selectivity rapidly decrease as surface curvature increases. Additionally, new aerospace materials typically exhibit an intricate microstructure that further complicates the inspection...
July 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28709335/entropic-multirelaxation-time-lattice-boltzmann-method-for-moving-and-deforming-geometries-in-three-dimensions
#4
B Dorschner, S S Chikatamarla, I V Karlin
Entropic lattice Boltzmann methods have been developed to alleviate intrinsic stability issues of lattice Boltzmann models for under-resolved simulations. Its reliability in combination with moving objects was established for various laminar benchmark flows in two dimensions in our previous work [B. Dorschner, S. Chikatamarla, F. Bösch, and I. Karlin, J. Comput. Phys. 295, 340 (2015)JCTPAH0021-999110.1016/j.jcp.2015.04.017] as well as for three-dimensional one-way coupled simulations of engine-type geometries in B...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709294/size-dependence-of-the-surface-tension-of-a-free-surface-of-an-isotropic-fluid
#5
Sergii Burian, Mykola Isaiev, Konstantinos Termentzidis, Vladimir Sysoev, Leonid Bulavin
We report on the size dependence of the surface tension of a free surface of an isotropic fluid. The size dependence of the surface tension is evaluated based on the Gibbs-Tolman-Koenig-Buff equation for positive and negative values of curvatures and the Tolman lengths. For all combinations of positive and negative signs of curvature and the Tolman length, we succeed to have a continuous function, avoiding the existing discontinuity at zero curvature (flat interfaces). As an example, a water droplet in the thermodynamical equilibrium with the vapor is analyzed in detail...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28696476/on-the-origin-of-the-driving-force-in-the-marangoni-propelled-gas-bubble-trapping-mechanism
#6
A Miniewicz, C Quintard, H Orlikowska, S Bartkiewicz
Gas bubbles can be trapped and then manipulated with laser light. In this report, we propose the detailed optical trapping mechanism of gas bubbles confined inside a thin light-absorbing liquid layer between two glass plates. The necessary condition of bubble trapping in this case is the direct absorption of light by the solution containing a dye. Due to heat release, fluid whirls propelled by the surface Marangoni effect at the liquid/gas interface emerge and extend to large distances. We report the experimental microscopic observation of the origin of whirls at an initially flat liquid/air interface as well as at the curved interface of a liquid/gas bubble and support this finding with advanced numerical simulations using the finite element method within the COMSOL Multiphysics platform...
July 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28688449/efficient-chemical-potential-evaluation-with-kinetic-monte-carlo-method-and-non-uniform-external-potential-lennard-jones-fluid-liquid-and-solid
#7
E A Ustinov
The aim of this paper is to present a method of a direct evaluation of the chemical potential of fluid, liquid, and solid with kinetic Monte Carlo simulation. The method is illustrated with the 12-6 Lennard-Jones (LJ) system over a wide range of density and temperature. A distinctive feature of the methodology used in the present study is imposing an external potential on the elongated simulation box to split the system into two equilibrium phases, one of which is substantially diluted. This technique provides a reliable direct evaluation of the chemical potential of the whole non-uniform system (including that of the uniformly distributed dense phase in the central zone of the box), which, for example, is impossible in simulation of the uniform crystalline phase...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28674687/effect-of-chemical-grafting-parameters-on-the-manufacture-of-functionalized-pvoh-films-having-controlled-water-solubility
#8
Andreas Haas, Daniel Schlemmer, Uwe Grupa, Markus Schmid
This study investigated the chemical grafting of a single-layer poly(vinyl alcohol) (PVOH) film. The effect of the grafting parameters (grafting time, grafting temperature, and concentration of fatty acid chloride) on the hydrophobicity of the film surface and the film solubility were evaluated. The PVOH substrate film (cold-water soluble at 20°C) was manufactured by flat extrusion and had a thickness of 50 μm (±5 μm). The chemical grafting was performed using the transfer method with palmitoyl chloride (C16)...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28618229/staggered-linear-assembly-of-spherical-cap-colloids
#9
Yogesh Shelke, Manigandan Sabapathy, Ethayaraja Mani
Linear assembly of colloidal particles is of fundamental interest in visualizing polymer dynamics and living organisms. We have developed a fluid-fluid interface-based method to synthesize spherical-cap polymeric latex particles. These particles are shown to spontaneously self-assemble in zigzag arrangement. The linear assembly is induced due to the shape anisotropy (one side is curved and the other side is nearly flat) and heterogeneous charge distribution on the particle surfaces. The necessities of these conditions are justified within the framework of DLVO theory...
June 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28590759/effects-of-nozzle-geometry-on-the-fluid-dynamics-of-thin-liquid-films-flowing-down-vertical-strings-in-the-rayleigh-plateau-regime
#10
Abolfazl Sadeghpour, Zezhi Zeng, Y Sungtaek Ju
Thin-liquid films flowing down vertical strings undergo instability, creating wavy film profiles and traveling beads. Previous studies assumed that the liquid film thickness and velocity profiles within the healing length from a nozzle were specified by the Nusselt solution, independent of the nozzle geometry. As a result, the influence of the nozzle diameter on the flow characteristics, such as the liquid bead size, spacing, and traveling speed, was largely overlooked. We report an experimental and numerical simulation study on liquid-film flows in the Rayleigh-Plateau regime while systematically varying the nozzle diameter from 0...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28590427/integral-design-methodology-of-photocatalytic-reactors-for-air-pollution-remediation
#11
REVIEW
Claudio Passalía, Orlando M Alfano, Rodolfo J Brandi
An integral reactor design methodology was developed to address the optimal design of photocatalytic wall reactors to be used in air pollution control. For a target pollutant to be eliminated from an air stream, the proposed methodology is initiated with a mechanistic derived reaction rate. The determination of intrinsic kinetic parameters is associated with the use of a simple geometry laboratory scale reactor, operation under kinetic control and a uniform incident radiation flux, which allows computing the local superficial rate of photon absorption...
June 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28566508/curvature-induced-stiffening-of-a-fish-fin
#12
Khoi Nguyen, Ning Yu, Mahesh M Bandi, Madhusudhan Venkadesan, Shreyas Mandre
How fish modulate their fin stiffness during locomotive manoeuvres remains unknown. We show that changing the fin's curvature modulates its stiffness. Modelling the fin as bendable bony rays held together by a membrane, we deduce that fin curvature is manifested as a misalignment of the principal bending axes between neighbouring rays. An external force causes neighbouring rays to bend and splay apart, and thus stretches the membrane. This coupling between bending the rays and stretching the membrane underlies the increase in stiffness...
May 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28559838/ten-year-follow-up-after-bilateral-submacular-neovascular-membrane-removal-in-a-case-of-autosomal-recessive-bestrophinopathy
#13
Carlos A Moreira, Carlos A Moreira-Neto, Mario Junqueira Nobrega, Eduardo Cunha de Souza
Herein, we report the case of an 8-year-old girl who presented in December 2000 with a submacular neovascular membrane in the right eye, with a clinical diagnosis of Best disease. At that time, she underwent pars plana vitrectomy (PPV) with removal of the subretinal choroidal neovascularization (CNV). Her vision improved from 20/200 to 20/25. Four years later, a new CNV developed in the other eye. Initially, she underwent unsuccessful photodynamic therapy. As her vision worsened, she underwent a second, this time successful, PPV with membrane removal in the left eye, with vision improving to 20/30...
January 2017: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28547816/three-component-aminoalkylations-yielding-dihydronaphthoxazine-based-sirtuin-inhibitors-scaffold-modification-and-exploration-of-space-for-polar-side-chains
#14
Steffen Vojacek, Katja Beese, Zayan Alhalabi, Sören Swyter, Anja Bodtke, Carola Schulzke, Manfred Jung, Wolfgang Sippl, Andreas Link
Nonpolar derivatives of heterocyclic aromatic screening hits like the non-selective sirtuin inhibitor splitomicin tend to be poorly soluble in biological fluids. Unlike sp(3) -rich natural products, flat aromatic compounds are prone to stacking and often difficult to optimize into leads with activity in cellular systems. The aim of this work was to identify anchor points for the introduction of sp(3) -rich fragments with polar functional groups into the newly discovered active (IC50  = 5 μM) but nonpolar scaffold 1,2-dihydro-3H-naphth[1,2-e][1,3]oxazine-3-thione by a molecular modeling approach...
May 26, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28535342/diffusion-under-confinement-hydrodynamic-finite-size-effects-in-simulation
#15
Pauline Simonnin, Benoı T Noetinger, Carlos Nieto-Draghi, Virginie Marry, Benjamin Rotenberg
We investigate finite-size effects on diffusion in confined fluids using molecular dynamics simulations and hydrodynamic calculations. Specifically, we consider a Lennard-Jones fluid in slit pores without slip at the interface and show that the use of periodic boundary conditions in the directions along the surfaces results in dramatic finite-size effects, in addition to that of the physically relevant confining length. As in the simulation of bulk fluids, these effects arise from spurious hydrodynamic interactions between periodic images and from the constraint of total momentum conservation...
June 5, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28515659/the-flow-separation-delay-in-the-boundary-layer-by-induced-vortices
#16
Ishtiaq A Chaudhry, Tipu Sultan, Farrukh A Siddiqui, M Farhan, M Asim
ABSTRACT: A series of experiments involving the particle image velocimetry technique are carried out to analyse the quantitative effectiveness of the synthesized vortical structures towards actual flow separation control. The streamwise vortices are synthesized from the synthetic jet actuator and introduced into the attached and separating boundary layer developed on the flat plate surface. Two types of actuators with different geometrical set-ups are used to analyse the evolution of vortical structures in the near wall region and their impact towards achieving separation delay in the boundary layer...
2017: Journal of Visualization
https://www.readbyqxmd.com/read/28512008/3d-printing-and-modelling-of-customized-implants-and-surgical-guides-for-non-human-primates
#17
Xing Chen, Jessy K Possel, Catherine Wacongne, Anne F van Ham, P Christiaan Klink, Pieter R Roelfsema
BACKGROUND: Primate neurobiologists use chronically implanted devices such as pedestals for head stabilization and chambers to gain access to the brain and study its activity. Such implants are skull-mounted, and made from a hard, durable material, such as titanium. NEW METHOD: Here, we present a low-cost method of creating customized 3D-printed cranial implants that are tailored to the anatomy of individual animals. We performed pre-surgical computed tomography (CT) and magnetic resonance (MR) scans to generate three-dimensional (3D) models of the skull and brain...
July 15, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28499053/a-modified-perfluoro-n-octane-assisted-autologous-internal-limiting-membrane-transplant-for-failed-macular-hole-reintervention-a-case-series
#18
Sengul Ozdek, Prabu Baskaran, Levent Karabas, Pedro Pereira Neves
The authors describe a modified perfluoro-n-octane (PFO)-assisted autologous internal limiting membrane (ILM) transplantation technique for macular hole (MH) reintervention and present results from a series of 11 patients. The authors harvested a free ILM flap and transplanted it into the MH under a PFO bubble. The time at which PFO is injected, the extent of coverage of PFO, and the sequence of fluid-air exchange (FAE) are crucial to overcome previously described technical difficulties of relieving the flap from forceps, stabilizing the flap into the MH, and prevention of flap dislodgement during FAE...
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28475345/mechanical-properties-of-membranes-composed-of-gel-phase-or-fluid-phase-phospholipids-probed-on-liposomes-by-atomic-force-spectroscopy
#19
Oumaima Et-Thakafy, Nicolas Delorme, Cédric Gaillard, Cristelle Mériadec, Franck Artzner, Christelle Lopez, Fanny Guyomarc'h
In many liposome applications, the nanomechanical properties of the membrane envelope are essential to ensure, e.g., physical stability, protection, or penetration into tissues. Of all factors, the lipid composition and its phase behavior are susceptible to tune the mechanical properties of membranes. To investigate this, small unilamellar vesicles (SUV; diameter < 200 nm), referred to as liposomes, were produced using either unsaturated 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) or saturated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) in aqueous buffer at pH 6...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28464654/viscous-effects-on-the-attenuation-of-a-plane-wave-by-an-acoustic-lining-in-shear-flow
#20
Doran Khamis, Edward James Brambley
The attenuation of a plane acoustic wave incident on a flat impedance surface in a sheared and viscous fluid is investigated numerically and asymptotically. Predictions of various boundary models of impedance surfaces in shear flow are tested by comparing their predicted reflection coefficient. It is found that viscosity has a significant effect, reducing the reflection of upstream propagating sound while increasing the reflection of cross-stream propagating sound. The classical Ingard-Myers boundary condition is shown to incorrectly predict the damping rate of sound in many cases, and in some cases viscous effects are shown to be comparable to shear effects...
April 2017: Journal of the Acoustical Society of America
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