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https://www.readbyqxmd.com/read/28414456/interfacial-rheology-of-sterically-stabilized-colloids-at-liquid-interfaces-and-its-effect-on-the-stability-of-pickering-emulsions
#1
Rob Van Hooghten, Victoria E Blair, Anja Vananroye, Andrew B Schofield, Jan Vermant, Job H J Thijssen
Particle-laden interfaces can be used to stabilize a variety of high-interface systems, from foams over emulsions to polymer blends. The relation between the particle interactions, the structure and rheology of the interface, and the stability of the system remains unclear. In the present work, we experimentally investigate how micron-sized, near-hard-sphere-like particles affect the mechanical properties of liquid interfaces. In particular, by comparing dried and undried samples, we investigate the effect of aggregation state on the properties of the particle-laden liquid interface and its relation to the stability of the corresponding Pickering emulsions...
April 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28413347/a-biochemo-mechano-coupled-computational-model-combining-membrane-transport-and-pericellular-proteolysis-in-tissue-mechanics
#2
A-T Vuong, A D Rauch, W A Wall
We present a computational model for the interaction of surface- and volume-bound scalar transport and reaction processes with a deformable porous medium. The application in mind is pericellular proteolysis, i.e. the dissolution of the solid phase of the extracellular matrix (ECM) as a response to the activation of certain chemical species at the cell membrane and in the vicinity of the cell. A poroelastic medium model represents the extra cellular scaffold and the interstitial fluid flow, while a surface-bound transport model accounts for the diffusion and reaction of membrane-bound chemical species...
March 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28408782/assessment-of-regional-left-ventricular-systolic-function-by-strain-imaging-echocardiography-in-phenotypically-normal-and-abnormal-maine-coon-cats-tested-for-the-a31p-mutation-in-the-mybpc3-gene
#3
Arine Pellegrino, Alexandre G T Daniel, Guilherme G Pereira, Paula H Itikawa, Maria Helena M A Larsson
Myocardial dysfunction occurs in cats with hypertrophic cardiomyopathy (HCM), but little is known about the early stages of the disease. Strain imaging echocardiography is a method that enables the quantitative assessment of myocardial function and deformity, allowing the characterization of systolic dysfunction. The objective of this study was to assess systolic function using strain imaging echocardiography in Maine coon cats genetically tested for the A31P mutation in the MYBPC3 gene, with and without ventricular hypertrophy...
April 2017: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
https://www.readbyqxmd.com/read/28402378/buckling-behaviour-of-composites-with-double-walled-nanotubes-from-carbon-and-phosphorus
#4
Kun Cai, Jing Wan, Likui Yang, Ning Wei, Jiao Shi, Qing-Hua Qin
Due to weak interactions among phosphorus atoms in black phosphorene, a nanotube obtained by curling single-layer black phosphorus is not as stable as a carbon nanotube (CNT) at finite temperature. In the present work, we recommend a new 1D composite material with a double-walled nanotube (DWNT) from a black phosphorus nanotube (BPNT) and a CNT. The dynamic response of the composite DWNTs is simulated using a molecular dynamics approach. Effects of the factors including temperature, slenderness and configurations of DWNTs on dynamic behavior of the composite are discussed...
April 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28398032/novel-electrically-conductive-porous-pdms-carbon-nanofiber-composites-for-deformable-strain-sensors-and-conductors
#5
Shuying Wu, Jin Zhang, Raj B Ladani, Anil R Ravindran, Adrian P Mouritz, Anthony J Kinloch, Chun H Wang
Highly flexible and deformable electrically conductive materials are vital for the emerging field of wearable electronics. To address the challenge of flexible materials with a relatively high electrical conductivity and a high elastic limit, we report a new and facile method to prepare porous polydimethylsiloxane/carbon nanofiber composites (denoted by p-PDMS/CNF). This method involves using sugar particles coated with carbon nanofibers (CNFs) as the templates. The resulting three-dimensional porous nanocomposites, with the CNFs embedded in the PDMS pore walls, exhibit a greatly increased failure strain (up to ∼94%) compared to that of the solid, neat PDMS (∼48%)...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28397931/the-hydrodynamics-of-segmented-two-phase-flow-in-a-circular-tube-with-rapidly-dissolving-drops
#6
Thomas F Leary, Arun Ramachandran
This article discusses boundary integral simulations of dissolving drops flowing through a cylindrical tube for large aspect ratio drops. The dynamics of drop dissolution is determined by three dimensionless parameters: λ, the viscosity of the drop fluid relative to the suspending fluid; Ca, the capillary number defining the ratio of the hydrodynamic force to the interfacial tension force; and k, a dissolution constant based on the velocity of dissolution. For a single dissolving drop, the velocity in the upstream region is greater than the downstream region, and for sufficiently large k, the downstream velocity can be completely reversed, particularly at low Ca...
April 11, 2017: Soft Matter
https://www.readbyqxmd.com/read/28393600/shell-design-and-reaming-technique-affect-deformation-in-mobile-bearing-total-hip-arthroplasty-acetabular-components
#7
Scott R Small, John B Meding, Jordan W Oja, Katherine S Lakstins, Danielle J Gehron, Renee D Rogge, Christine A Buckley
Press-fit acetabular components are susceptible to rim deformation. The inherent variability within acetabular reaming techniques may generate increased press-fit and, subsequently, additional component deformation. The purpose of this study was to analyze the insertion and deformation characteristics of acetabular components designed for dual-mobility systems based on component design, size, and reaming technique. Shell deformation was quantified in a validated worst-case scenario foam pinch model. Thin-walled, one-piece, and modular dual-mobility shells of varying size were implanted in under- and over-reamed cavities with insertion force measured and shell deformation assessed using digital image correlation...
April 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28387996/porosity-and-tissue-integration-of-elastic-mesh-implants-evaluated-in-vitro-and-in-vivo
#8
Alexander Ciritsis, Andreas Horbach, Manfred Staat, Christiane K Kuhl, Nils Andreas Kraemer
PURPOSE: In vivo, a loss of mesh porosity triggers scar tissue formation and restricts functionality. The purpose of this study was to evaluate the properties and configuration changes as mesh deformation and mesh shrinkage of a soft mesh implant compared with a conventional stiff mesh implant in vitro and in a porcine model. MATERIAL AND METHODS: Tensile tests and digital image correlation were used to determine the textile porosity for both mesh types in vitro...
April 7, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28387165/the-optimal-density-of-cellular-solids-in-axial-tension
#9
L Angela Mihai, Khulud Alayyash, Hayley Wyatt
For cellular bodies with uniform cell size, wall thickness, and shape, an important question is whether the same volume of material has the same effect when arranged as many small cells or as fewer large cells. To answer this question, for finite element models of periodic structures of Mooney-type material with different structural geometry and subject to large strain deformations, we identify a nonlinear elastic modulus as the ratio between the mean effective stress and the mean effective strain in the solid cell walls, and show that this modulus increases when the thickness of the walls increases, as well as when the number of cells increases while the volume of solid material remains fixed...
May 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28386914/laparoscopy-assisted-full-thickness-resection-of-the-duodenum-for-patients-with-gastrointestinal-stromal-tumor-with-ulceration
#10
Nobutsugu Abe, Yoshikazu Hashimoto, Hirohisa Takeuchi, Atsuko Ohki, Gen Nagao, Yutaka Suzuki, Tadahiko Masaki, Toshiyuki Mori, Masanori Sugiyama
INTRODUCTION: Gastrointestinal stromal tumor (GIST) with ulceration may potentially disseminate into the peritoneal cavity after laparoscopic local wedge resection (full-thickness resection) when the intestinal wall is opened under the aeroperitoneum. To prevent this intraoperative tumor seeding, we developed laparoscopy-assisted full-thickness resection (LAFTR) of the duodenum for GIST with ulceration. Here, we present the preliminary results of LAFTR. METHODS: Three patients with duodenal GIST with ulceration underwent LAFTR...
April 7, 2017: Asian Journal of Endoscopic Surgery
https://www.readbyqxmd.com/read/28378997/flyweight-3d-graphene-scaffolds-with-microinterface-barrier-derived-tunable-thermal-insulation-and-flame-retardancy
#11
Qiangqiang Zhang, Menglong Hao, Xiang Xu, Guoping Xiong, Hui Li, Timothy S Fisher
In this article, flyweight three-dimensional (3D) graphene scaffolds (GSs) have been demonstrated with a microinterface barrier-derived thermal insulation and flame retardancy characteristics. Such 3D GSs were fabricated by a modified hydrothermal method and a unidirectional freeze-casting process with hierarchical porous microstructures. Because of high porosity (99.9%), significant phonon scattering, and strong π-π interaction at the interface barriers of multilayer graphene cellular walls, the GSs demonstrate a sequence of multifunctional properties simultaneously, such as lightweight density, thermal insulating characteristics, and outstanding mechanical robustness...
April 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28373575/unveiling-the-carrier-transport-mechanism-in-epitaxial-graphene-for-forming-wafer-scale-single-domain-graphene
#12
Sang-Hoon Bae, Xiaodong Zhou, Seyoung Kim, Yun Seog Lee, Samuel S Cruz, Yunjo Kim, James B Hannon, Yang Yang, Devendra K Sadana, Frances M Ross, Hongsik Park, Jeehwan Kim
Graphene epitaxy on the Si face of a SiC wafer offers monolayer graphene with unique crystal orientation at the wafer-scale. However, due to carrier scattering near vicinal steps and excess bilayer stripes, the size of electrically uniform domains is limited to the width of the terraces extending up to a few microns. Nevertheless, the origin of carrier scattering at the SiC vicinal steps has not been clarified so far. A layer-resolved graphene transfer (LRGT) technique enables exfoliation of the epitaxial graphene formed on SiC wafers and transfer to flat Si wafers, which prepares crystallographically single-crystalline monolayer graphene...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28373558/direct-visualization-of-the-arterial-wall-water-permeability-barrier-using-cars-microscopy
#13
Bertrand M Lucotte, Chloe Powell, Jay R Knutson, Christian A Combs, Daniela Malide, Zu-Xi Yu, Mark Knepper, Keval D Patel, Anna Pielach, Errin Johnson, Lyudmyla Borysova, Kim A Dora, Robert S Balaban
The artery wall is equipped with a water permeation barrier that allows blood to flow at high pressure without significant water leak. The precise location of this barrier is unknown despite its importance in vascular function and its contribution to many vascular complications when it is compromised. Herein we map the water permeability in intact arteries, using coherent anti-Stokes Raman scattering (CARS) microscopy and isotopic perfusion experiments. Generation of the CARS signal is optimized for water imaging with broadband excitation...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28370909/early-marker-of-regional-left-ventricular-deformation-in-patients-with-hypertrophic-cardiomyopathy-evaluated-by-mri-tissue-tracking-the-effects-of-myocardial-hypertrophy-and-fibrosis
#14
Hua-Yan Xu, Jing Chen, Zhi-Gang Yang, Rui Li, Ke Shi, Qin Zhang, Xi Liu, Lin-Jun Xie, Li Jiang, Ying-Kun Guo
PURPOSE: To evaluate the regional left ventricular (LV) myocardial strain of early stage hypertrophic cardiomyopathy (HCM) patients by magnetic resonance (MR) tissue tracking. MATERIALS AND METHODS: In all, 114 adult HCM patients classified as NYHA I or II and 32 healthy volunteers were enrolled and underwent 3.0T MR examination. Vertical 2-chamber long axis, horizontal 4-chamber, and short axis cine sequence as well as late gadolinium enhancement images (LGE) were scanned...
March 29, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28370259/regional-right-ventricular-remodeling-and-function-in-children-with-idiopathic-pulmonary-arterial-hypertension-vs-those-with-pulmonary-valve-stenosis-insights-into-mechanics-of-right-ventricular-dysfunction
#15
Mieke M P Driessen, Folkert J Meijboom, Wei Hui, Andreea Dragulescu, Luc Mertens, Mark K Friedberg
BACKGROUND: Right ventricular (RV) pressure overload in the context of pulmonary stenosis (PS) has a much better prognosis than in the context of idiopathic pulmonary arterial hypertension (iPAH), which may be related to differences in global and regional RV remodeling and systolic function. We compared RV mechanics in children with PS to those with iPAH, aiming to identify mechanisms and markers of RV dysfunction. METHODS: Eighteen controls, 18 iPAH and 16 PS patients were retrospectively studied...
April 1, 2017: Echocardiography
https://www.readbyqxmd.com/read/28367856/successful-management-of-gorham-stout-disease-in-the-cervical-spine-by-combined-conservative-and-surgical-treatments-a-case-report
#16
Satoshi Tateda, Toshimi Aizawa, Ko Hashimoto, Haruo Kanno, Susumu Ohtsu, Eiji Itoi, Hiroshi Ozawa
Gorham-Stout disease (GSD) is a rare condition characterized by intraosseous proliferation of endothelial-lined vessels and progressive osteolysis. The precise etiology and pathophysiology of the disease remain poorly understood. Current therapeutic options for GSD include chemotherapy, radiotherapy, and surgical resection, but the surgical treatment of GSD is difficult, especially in the spinal lesion. The indication of wide-margined resection was limited because of anatomical features. Herein, we report a case of GSD of the cervical spine in which the lesions were successfully stabilized with combined conservative and surgical treatments...
2017: Tohoku Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28364526/expanding-role-of-orbital-decompression-in-aesthetic-surgery
#17
Mehryar Ray Taban
Background: Eye prominence is a source of cosmetic "deformity" for many patients not afflicted by Graves. Objectives: To report our experience in using customized orbital decompression for purely aesthetic reason to reduce eye prominence in non-thyroid patients. Methods: Retrospective analysis of patients undergoing cosmetic orbital decompression by one surgeon. Surgical technique included customized graded orbital bony-wall decompression (lateral-wall, basin, medial-wall, posterior-strut) and intraconal fat removal using eyelid crease and/or caruncle incisions...
April 1, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28363371/chest-wall-reconstruction-without-prosthetic-material
#18
REVIEW
Robert E Merritt
The surgical resection of primary and secondary tumors involving the chest wall often requires reconstruction with prosthetic and soft tissues, such as muscle flaps. There are situations when a soft tissue reconstruction of the chest wall is preferable. Prosthetic material can become infected and require reoperation for removal of the infected material. Rigid prosthetic materials can result in chest wall pain and deformity. Muscle is the soft tissue of choice for coverage of full-thickness chest wall defects with or without prosthetic material...
May 2017: Thoracic Surgery Clinics
https://www.readbyqxmd.com/read/28356291/slowly-cycling-rho-kinase-dependent-actomyosin-crossbridge-slippage-explains-intrinsic-high-compliance-of-detrusor-smooth-muscle
#19
Christopher J Neal, Jia Bao Lin, Tanner Hurley, Amy S Miner, John E Speich, Adam P Klausner, Paul H Ratz
Biological soft tissues are viscoelastic because they display time-independent pseudo-elasticity and time-dependent viscosity. Upon an imposed ramp increase then decrease in strain, the resultant stress changes, termed loading and unloading respectively, produce nonlinear stress-strain curves and a reversible reduction in the stress-strain work area that identifies viscosity. However, there is evidence that bladder may also display plasticity; an increase in strain that is unrecoverable unless work is done by the muscle...
March 29, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28352029/the-mystery-of-the-nonfunctioning-catheter-an-unusual-complication-of-peritoneal-dialysis-outflow-failure
#20
Pramod K Guru, Beth Piraino
Noninfectious complications of peritoneal dialysis (PD) remain an important impediment to successful implementation of PD. Rare noninfectious complications of the PD catheter are sparsely reported. We report an unusual complication of outflow failure due to a peritoneal catheter that separated into two distinct intra-abdominal segments, due to an unusual method of placement in which two catheters were connected to make a long intra-abdominal portion to permit a high exit site on the abdominal wall. The application of this unusual rather a unique technique led to separation of the two catheter portions and the outflow failure shortly after the patient started continuous ambulatory PD...
March 2017: Saudi Journal of Kidney Diseases and Transplantation
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