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https://www.readbyqxmd.com/read/28297978/phase-behavior-of-charged-colloids-at-a-fluid-interface
#1
Colm P Kelleher, Rodrigo E Guerra, Andrew D Hollingsworth, Paul M Chaikin
We study the phase behavior of a system of charged colloidal particles that are electrostatically bound to an almost flat interface between two fluids. We show that, despite the fact that our experimental system consists of only 10^{3}-10^{4} particles, the phase behavior is consistent with the theory of melting due to Kosterlitz, Thouless, Halperin, Nelson, and Young. Using spatial and temporal correlations of the bond-orientational order parameter, we classify our samples into solid, isotropic fluid, and hexatic phases...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28297838/inelastic-non-newtonian-flow-over-heterogeneously-slippery-surfaces
#2
A Sander Haase, Jeffery A Wood, Lisette M J Sprakel, Rob G H Lammertink
In this study, we investigated inelastic non-Newtonian fluid flow over heterogeneously slippery surfaces. First, we simulated the flow of aqueous xanthan gum solutions over a bubble mattress, which is a superhydrophobic surface consisting of transversely positioned no-slip walls and no-shear gas bubbles. The results reveal that for shear-thinning fluids wall slip can be increased significantly, provided that the system is operated in the shear-thinning regime. For a 0.2 wt% xanthan gum solution with a power-law index of n=0...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28291321/nanoengineered-superhydrophobic-surfaces-of-aluminum-with-extremely-low-bacterial-adhesivity
#3
Ferdi Hizal, Natthakan Rungraeng, Junghoon Lee, Soojin Jun, Henk J Busscher, Henny C Van der Mei, Chang-Hwan Choi
Bacterial adhesion and biofilm formation on surfaces are troublesome in many industrial processes. Here, nanoporous and nanopillared aluminum surfaces were engineered by anodizing and post-etching processes and made hydrophilic (using the inherent oxide layer) or hydrophobic (applying a Teflon coating) with the aim of discouraging bacterial adhesion. Adhesion of Staphylococcus aureus ATCC 12600 (Gram-positive, spherically-shaped) and Escherichia coli K-12 (Gram-negative, rod-shaped) was evaluated to the nanoengineered surfaces under both static and flow conditions (fluid shear rate of 37 1/s)...
March 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28275605/unrelenting-ocular-pain-as-a-masquerading-symptom-of-occult-choroidal-metastasis
#4
Jordan D Deaner, Renelle Pointdujour-Lim, Emil Anthony T Say, Carol L Shields
PURPOSE: To report a case of chronic eye pain as a presenting feature of choroidal metastasis from lung cancer. METHODS: We report the case of a 58-year-old Caucasian woman with stage IV lung adenocarcinoma presenting with an 8-month history of left eye pain and blurred vision. RESULTS: The patient had previously consulted 14 ophthalmologists with varying diagnoses including posterior scleritis and trigeminal neuralgia. Visual acuity at presentation was 20/20 in the right eye and 20/80 in the left eye...
January 2017: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/28267999/extension-of-golay-s-plate-height-equation-from-laminar-to-turbulent-flow-i-theory
#5
Fabrice Gritti
The reduced plate height (RPH) equation of Golay derived in 1958 for open tubular columns (OTC) is extended from laminar to turbulent-like flow. The mass balance equation is solved under near-equilibrium conditions in the mobile phase for changing shapes of the velocity profile across the OTC diameter. The final expression of the general RPH equation is: [Formula: see text] where ν is the reduced linear velocity, k is the retention factor, Dm is the bulk diffusion coefficient in the mobile phase, Da¯ is the average axial dispersion coefficient, Dr¯ is the average radial dispersion coefficient, Ds is the diffusion coefficient of the analyte in the stationary film of thickness df, D is the OTC inner diameter, and n≥2 is a positive number controlling the shape of the flow profile (polynomial of degree n)...
February 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28228029/predicting-low-temperature-free-energy-landscapes-with-flat-histogram-monte-carlo-methods
#6
Nathan A Mahynski, Marco A Blanco, Jeffrey R Errington, Vincent K Shen
We present a method for predicting the free energy landscape of fluids at low temperatures from flat-histogram grand canonical Monte Carlo simulations performed at higher ones. We illustrate our approach for both pure and multicomponent systems using two different sampling methods as a demonstration. This allows us to predict the thermodynamic behavior of systems which undergo both first order and continuous phase transitions upon cooling using simulations performed only at higher temperatures. After surveying a variety of different systems, we identify a range of temperature differences over which the extrapolation of high temperature simulations tends to quantitatively predict the thermodynamic properties of fluids at lower ones...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28176897/mechanical-characteristics-of-plastic-base-ports-and-impact-on-flushing-efficacy
#7
Gérard Guiffant, Patrice Flaud, Laurent Royon, Espérie Burnet, Jacques Merckx
BACKGROUND: Three types of totally implantable venous access devices, Ports, are currently in use: titanium, plastic (polyoxymethylene, POM), and mixed (titanium base with a POM shell). Physics theory suggests that the interaction between a non-coring needle (NCN, made of stainless steel) and a plastic base would lead to the stronger material (steel) altering the more malleable material (plastic). OBJECTIVES: To investigate whether needle impacts can alter a plastic base's surface, thus potentially reducing flushing efficacy...
2017: Medical Devices: Evidence and Research
https://www.readbyqxmd.com/read/28155122/anisotropic-permeability-of-trabecular-bone-and-its-relationship-to-fabric-and-architecture-a-computational-study
#8
T C Kreipke, G L Niebur
Trabecular bone is a porous, mineralized tissue found in vertebral bodies, the metaphyses and epiphyses of long bones, and in the irregular and flat shaped bones. The pore space is filled with bone marrow, a highly cellular fluid. Together, the bone and marrow behave as a poroelastic solid. In poroelasticity theory, the permeability is the primary material property that governs the momentum transfer between the solid and fluid constituents. In the linearized theory, the permeability of a material depends on the shape and connectivity of the pores...
February 2, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28147539/tuning-flexibility-to-control-selectivity-in-soft-porous-crystals
#9
Nathan A Mahynski, Vincent K Shen
We use flat-histogram Monte Carlo simulations to study how changing the flexibility of soft porous crystals (SPCs) affects their selective adsorption of a binary, size-asymmetric supercritical fluid. Specifically, we consider mesoporous SPCs which have multiple minima in their free energy profiles as a function of pore size such that they are capable of exhibiting polymorphism between a narrow and large pore phase. While specific fluid-pore interactions determine the shape of both pores' selectivity curve as a function of adsorbate pressure, an individual pore tends to selectively adsorb a species based on the size of the adsorbate molecule relative to itself, thereby shifting the pore's selectivity curve relative to its polymorph...
January 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28130556/the-new-vestibular-stimuli-sound-and-vibration-anatomical-physiological-and-clinical-evidence
#10
REVIEW
Ian S Curthoys
The classical view of the otoliths-as flat plates of fairly uniform receptors activated by linear acceleration dragging on otoconia and so deflecting the receptor hair bundles-has been replaced by new anatomical and physiological evidence which shows that the maculae are much more complex. There is anatomical spatial differentiation across the macula in terms of receptor types, hair bundle heights, stiffness and attachment to the overlying otolithic membrane. This anatomical spatial differentiation corresponds to the neural spatial differentiation of response dynamics from the receptors and afferents from different regions of the otolithic maculae...
April 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28116539/characteristics-of-melting-heat-transfer-during-flow-of-carreau-fluid-induced-by-a-stretching-cylinder
#11
Hashim, Masood Khan, Ali Saleh Alshomrani
This article provides a comprehensive analysis of the energy transportation by virtue of the melting process of high-temperature phase change materials. We have developed a two-dimensional model for the boundary layer flow of non-Newtonian Carreau fluid. It is assumed that flow is caused by stretching of a cylinder in the axial direction by means of a linear velocity. Adequate local similarity transformations are employed to determine a set of non-linear ordinary differential equations which govern the flow problem...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28097480/average-flow-generation-by-a-pulsating-flow-near-a-curved-interface
#12
Lyudmila S Klimenko, Dmitry V Lyubimov
This paper is devoted to the study of curvature influence on the average flow generation near the fluid interface. The time averaging of a non-uniform pulsating flow often results in a nonzero average flow in the bulk. The well-known average flow occurs near a solid surface, the so-called Schlichting mechanism of the average flow generation. For flows with a free surface there is the other known mechanism of Longuet-Higgins, according to which the average flow is generated by surface waves traveling on a free surface...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28062204/impact-of-formulation-properties-and-process-parameters-on-the-dispensing-and-depositioning-of-drug-nanosuspensions-using-micro-valve-technology
#13
Bastian Bonhoeffer, Arno Kwade, Michael Juhnke
Flexible manufacturing processes with continuously adjustable dose strengths are considered particularly innovative and interesting for applications in personalized medicine, continuous manufacturing, or early drug development. A piezo-actuated micro-valve has been investigated for the dispensing and depositioning of drug nanosuspensions onto substrates to facilitate the manufacturing of solid oral dosage forms. The investigated micro-valve has been characterized regarding dispensing behavior, mass flow, accuracy, and robustness...
January 3, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28056057/flat-anterior-chamber-after-trabeculectomy-in-secondary-angle-closure-glaucoma-with-best1-gene-mutation-case-series
#14
Yimin Zhong, Xinxing Guo, Hui Xiao, Jingyi Luo, Chengguo Zuo, Xiaobo Huang, Jingjing Huang, Lan Mi, Qingjiong Zhang, Xing Liu
PURPOSE: Trabeculectomy has been regarded as a mainstay of initial treatment in eyes of angle closure glaucoma (ACG) with peripheral anterior synechia > 180° in the Chinese population while its efficacy in secondary ACG with BEST1 gene mutation remains unclear. We set out to investigate the treatment outcome of trabeculectomy for secondary ACG in a group of patients with autosomal recessive bestrophinopathy (ARB). METHODS: In this retrospective case series study, 8 secondary ACG patients with ARB and their 4 recruited family members underwent a thorough ophthalmic examination including best-corrected visual acuity, Goldmann applanation tonometry, gonioscopy, and fundus examinations...
2017: PloS One
https://www.readbyqxmd.com/read/28049334/anomalous-diffusion-and-diffusion-anomaly-in-confined-janus-dumbbells
#15
Leandro B Krott, Cristina Gavazzoni, José Rafael Bordin
Self-assembly and dynamical properties of Janus nanoparticles have been studied by molecular dynamic simulations. The nanoparticles are modeled as dimers and they are confined between two flat parallel plates to simulate a thin film. One monomer from the dumbbells interacts by a standard Lennard-Jones potential and the other by a two-length scales shoulder potential, typically used for anomalous fluids. Here, we study the effects of removing the Brownian effects, typical from colloidal systems immersed in aqueous solution, and consider a molecular system, without the drag force and the random collisions from the Brownian motion...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28033229/primary-laser-photocoagulation-for-the-treatment-of-giant-retinal-tears
#16
Jack Ao, Saban Horo, Lachlan Farmer, Weng Onn Chan, Jagjit Gilhotra
PURPOSE: Laser photocoagulation has typically been used as an adjunctive treatment to pars planar vitrectomy in achieving retinopexy in the treatment of giant retinal tears. We describe three cases where the giant retinal tear was treated with laser photocoagulation alone. METHODS: A retrospective case report of three patients with giant retinal tears who underwent primary laser photocoagulation. RESULTS: Fundus examination up to 18 months after primary laser photocoagulation of all 3 patients revealed a flat attached retina and no significant complications...
December 28, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28007984/microbial-competition-in-porous-environments-can-select-against-rapid-biofilm-growth
#17
Katharine Z Coyte, Hervé Tabuteau, Eamonn A Gaffney, Kevin R Foster, William M Durham
Microbes often live in dense communities called biofilms, where competition between strains and species is fundamental to both evolution and community function. Although biofilms are commonly found in soil-like porous environments, the study of microbial interactions has largely focused on biofilms growing on flat, planar surfaces. Here, we use microfluidic experiments, mechanistic models, and game theory to study how porous media hydrodynamics can mediate competition between bacterial genotypes. Our experiments reveal a fundamental challenge faced by microbial strains that live in porous environments: cells that rapidly form biofilms tend to block their access to fluid flow and redirect resources to competitors...
January 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27993017/pore-model-in-the-melting-regime-of-a-lyotropic-biomembrane-with-an-anionic-phospholipid
#18
Francesco Spinozzi, Lia Q Amaral
Aqueous dispersions of the anionic phospholipid dimyristoyl phosphatidyl glycerol (DMPG) exhibit an unusual "melting regime", at the phase transition between the ordered (gel) and the disordered (fluid liquid crystal) state of hydrocarbon chains, depending on the ionic strength and DMPG concentration, previously attributed to the pore formation. Dispersions with 150 mM DMPG present a lamellar phase above 23 °C, within the melting regime. In this study, we present a detailed pore model for the analysis of small-angle X-ray scattering (SAXS) results and their variation with temperature, focused on the surface fractions of pores in the bilayers...
December 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27982636/evolution-of-a-vortex-in-a-strain-flow
#19
N C Hurst, J R Danielson, D H E Dubin, C M Surko
Experiments and vortex-in-cell simulations are used to study an initially axisymmetric, spatially distributed vortex subject to an externally imposed strain flow. The experiments use a magnetized pure electron plasma to model an inviscid two-dimensional fluid. The results are compared to a theory assuming an elliptical region of constant vorticity. For relatively flat vorticity profiles, the dynamics and stability threshold are in close quantitative agreement with the theory. Physics beyond the constant-vorticity model, such as vortex stripping, is investigated by studying the behavior of nonflat vorticity profiles...
December 2, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27890677/time-course-of-organ-of-corti-degeneration-after-noise-exposure
#20
Barbara A Bohne, Melissa Kimlinger, Gary W Harding
From our permanent collection of plastic-embedded flat preparations of chinchilla cochleae, 22 controls and 199 ears from noise-exposed animals were used to determine when, postexposure, hair cell (HC) and supporting cell (SC) degeneration were completed. The exposed ears were divided into four groups based on exposure parameters: 0.5- or 4-kHz octave band of noise at moderate (M) or high (H) intensities. Postexposure survival ranged from <1 h to 2.5 y. Ears fixed ≤ 0-12 h postexposure were called 'acute'...
November 24, 2016: Hearing Research
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