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large pore mesh

Feng-Li He, Da-Wei Li, Jin He, Yang-Yang Liu, Fiaz Ahmad, Ya-Li Liu, Xudong Deng, Ya-Jing Ye, Da-Chuan Yin
Electrospinning is a powerful method for preparing porous materials that can be applied as biomedical materials for implantation or tissue engineering or as scaffolds for 3D cell culture experiments. However, this technique is limited in practical applications because the pore size of 3D scaffolds directly prepared by conventional electrospinning is usually less than several tens of micrometres, which may not be suitable for 3D cell culture and tissue growth. To allow for satisfactory 3D cell culture and tissue engineering, the pore size of the scaffold should be controllable according to the requirement of the specific cells to be cultured...
May 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Mubbshir Saleem, Alessandro Spagni, Luca Alibardi, Alberto Bertucco, Maria Cristina Lavagnolo
This study investigated the behaviour of dynamic membrane (DM) filtration for the treatment of stabilised landfill leachate in a bench-scale pre-anoxic and aerobic submerged dynamic membrane bioreactor (DMBR). Four meshes with different openings (10, 52, 85 and 200 μm) were tested to support the development of DM. Differences were observed among the meshes in supporting the development of the cake layer constituting the DM. The treatment of landfill leachate had an impact on sludge characteristics resulting in deteriorated filtration performance of the DM...
February 22, 2018: Journal of Environmental Management
Kathryn McAvoy, David Jones, Raghu Raj Singh Thakur
PURPOSE: To investigate the sustained ocular delivery of small and large drug molecules from photocrosslinked poly(ethylene glycol) diacrylate (PEGDA) implants with varying pore forming agents. METHODS: Triamcinolone acetonide and ovalbumin loaded photocrosslinked PEGDA implants, with or without pore-forming agents, were fabricated and characterised for chemical, mechanical, swelling, network parameters, as well as drug release and biocompatibility. HPLC-based analytical methods were employed for analysis of two molecules; ELISA was used to demonstrate bioactivity of ovalbumin...
January 16, 2018: Pharmaceutical Research
Wangwang Qiu, Cheng Zhong, Rui Xu, Ting Zou, Fujun Wang, Youben Fan, Lu Wang, Zhili Yang
Abdominal wall hernias are repaired with tension-free prosthetic materials but there remains a foreign body response (FBR) to commonly used polypropylene mesh. Thus, we should optimize mesh materials to improve the patient outcomes after surgery. A polypropylene mesh was developed with wrap knitting technique. The physical, mechanical and biocompatible characteristics were tested in a rat abdominal hernia model and compared to ULTRAPRO and Easy Prosthesis. Polypropylene mesh of two pore sizes was developed (LP-WKPM and SP-WKPM)...
January 3, 2018: Journal of Biomedical Materials Research. Part A
L J Cooper, K R Daly, P D Hallett, M Naveed, N Koebernick, A G Bengough, T S George, T Roose
The parameters in Richards' equation are usually calculated from experimentally measured values of the soil-water characteristic curve and saturated hydraulic conductivity. The complex pore structures that often occur in porous media complicate such parametrization due to hysteresis between wetting and drying and the effects of tortuosity. Rather than estimate the parameters in Richards' equation from these indirect measurements, image-based modelling is used to investigate the relationship between the pore structure and the parameters...
November 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
Jeremy A Warren, Lucas R Beffa, Alfredo M Carbonell, Jennifer Cull, Brent Sinopoli, Joseph A Ewing, Cedrek McFadden, Jay Crockett, William S Cobb
BACKGROUND: Reversal of an enterostomy results in a high rate of incisional hernia at the ostomy site. Prophylactic mesh reinforcement of the fascial defect is typically not considered due to the contaminated nature of the case. We present the outcomes of a series of prophylactic mesh reinforcements with retromuscular, large-pore polypropylene at the time of enterostomy reversal. METHODS: Retrospective review of all ostomy reversals was performed. All cases with placement of synthetic mesh reinforcement were identified from a prospectively maintained, hernia database...
December 7, 2017: Surgery
Urbankova Iva, Sindhwani Nikhil, Callewaert Geertje, Turri Alice, Rita Rynkevic, Hympanova Lucie, Feola Andrew, Deprest Jan
BACKGROUND AND OBJECTIVE: Large deformations in synthetic meshes used in pelvic organ prolapse surgery may lead to suboptimal support for the underlying tissue, graft-related complications as well as recurrence. Our aim was to quantify in vivo longitudinal changes in mesh shape and geometry in a large animal model. We compare two commonly used mesh shapes, armed and flat, that are differently affixed. The secondary outcomes were active and passive biomechanical properties. METHODS: A total of 18 animals were used...
November 2017: Journal of the Mechanical Behavior of Biomedical Materials
P Rogmark, O Ekberg, A Montgomery
Purpose Ingrowth of fibroblasts in a polypropylene mesh may cause contraction and a later recurrence. We assessed mesh contraction in intraabdominal and retromuscular implantation after incisional hernia repair. METHODS: A cohort of patients within an RCT on laparoscopic (LHR) versus open hernia repair (OHR) had their mesh borders marked with metal clips. X-ray was performed on postoperative day 1 and after 1 year. Total length, width, and dislocation were measured. A tacker fixated large-pore polypropylene mesh was used in LHR, and a retromuscular small-pore heavy-weight mesh was sutured to the midline in OHR...
October 2017: Hernia: the Journal of Hernias and Abdominal Wall Surgery
Jacob Witten, Katharina Ribbeck
Biological hydrogels such as mucus, extracellular matrix, biofilms, and the nuclear pore have diverse functions and compositions, but all act as selectively permeable barriers to the diffusion of particles. Each barrier has a crosslinked polymeric mesh that blocks penetration of large particles such as pathogens, nanotherapeutics, or macromolecules. These polymeric meshes also employ interactive filtering, in which affinity between solutes and the gel matrix controls permeability. Interactive filtering affects the transport of particles of all sizes including peptides, antibiotics, and nanoparticles and in many cases this filtering can be described in terms of the effects of charge and hydrophobicity...
June 22, 2017: Nanoscale
Issa Kone, Ao Xie, Yang Tang, Yu Chen, Jia Liu, Yongmei Chen, Yanzhi Sun, Xiaojin Yang, Pingyu Wan
Hierarchical porous Fe/N/S-doped carbon with a high content of graphitic nitrogen (FeNS/HPC) has been successfully synthesized by a facile dual-template method. FeNS/HPC shows not only macropores resulting from the dissolution of the SiO2 template, but abundant mesopores were also obtained after removing the in situ generated Fe2O3 nanoparticles on the ultrathin (∼4 nm) carbon shell of the macropores. Moreover, micropores are produced during the thermal pyrolysis of the carbon precursors. With respect to the electrochemical performance in the oxygen reduction reaction (ORR), FeNS/HPC not only exceeds other prepared porous carbon materials completely but also shows higher onset potential (0...
June 21, 2017: ACS Applied Materials & Interfaces
C Daish, R Blanchard, K Gulati, D Losic, D Findlay, D J E Harvie, P Pivonka
In this paper, a comprehensive framework is proposed to estimate the anisotropic permeability matrix in trabecular bone specimens based on micro-computed tomography (microCT) imaging combined with pore-scale fluid dynamics simulations. Two essential steps in the proposed methodology are the selection of (i) a representative volume element (RVE) for calculation of trabecular bone permeability and (ii) a converged mesh for accurate calculation of pore fluid flow properties. Accurate estimates of trabecular bone porosities are obtained using a microCT image resolution of approximately 10 μm...
June 2017: Bone Reports
Akash Goyal, Francois T H Yu, Mathea G Tenwalde, Xucai Chen, Andrew Althouse, Flordeliza S Villanueva, John J Pacella
We have previously reported that long-tone-burst, high-mechanical-index ultrasound (US) and microbubble (MB) therapy can restore perfusion in both in vitro and in vivo models of microvascular obstruction (MVO). Addition of MBs to US has been found to potentiate the efficacy of thrombolytics on large venous thrombi; however, the optimal US parameters for achieving microvascular reperfusion of MVO caused by microthrombi, when combined with tissue plasminogen activator (tPA), are unknown. We sought to elucidate the specific effects of US, with and without tPA, for effective reperfusion of MVO in an in vitro model using both venous and arterial microthrombi...
July 2017: Ultrasound in Medicine & Biology
Thomas M Schutzius, Christopher Walker, Tanmoy Maitra, Romy Schönherr, Christos Stamatopoulos, Stefan Jung, Carlo Antonini, Hadi Eghlidi, Julie L Fife, Alessandra Patera, Dominique Derome, Dimos Poulikakos
Separating petroleum hydrocarbons from water is an important problem to address in order to mitigate the disastrous effects of hydrocarbons on aquatic ecosystems. A rational approach to address the problem of marine oil-water separation is to disperse the oil with the aid of surfactants in order to minimize the formation of large slicks at the water surface and to maximize the oil-water interfacial area. Here we investigate the fundamental wetting and transport behavior of such surfactant-stabilized droplets and the flow conditions necessary to perform sieving and separation of these stabilized emulsions...
April 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Andreas Gross, Afra Torge, Ulrich F Schaefer, Marc Schneider, Claus-Michael Lehr, Christian Wagner
Native horse mucus is characterized with micro- and macrorheology and compared to hydroxyethylcellulose (HEC) gel as a model. Both systems show comparable viscoelastic properties on the microscale and for the HEC the macrorheology is in good agreement with the microrheology. For the mucus, the viscoelastic moduli on the macroscale are several orders of magnitude larger than on the microscale. Large amplitude oscillatory shear experiments show that the mucus responds nonlinearly at much smaller deformations than HEC...
March 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
P Sreeda, A B Sathya, V Sivasubramanian
In the present study, self-forming dynamic membrane (SFDM) on rigid high-density polyethylene (HDPE) mesh with a large pore size of 2 mm is reported for the first time. The system was investigated for utilisation in simulated wastewater treatment by integrating the mesh with an aerobic bioreactor. The SFDM was analysed using Fourier transform infra-red (FT-IR) spectroscopy and visualised by scanning electron microscopy (SEM). The effect of the operating parameter on the change in composition of SFDM was also investigated...
February 28, 2017: Environmental Technology
D Weyhe
No abstract text is available yet for this article.
July 2017: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
Geraldine Hwee Ping Lee, Samuel Yew Ming Ho
Orbital blowout fractures are a common occurrence following orbital trauma. Depending on the size of the defect and the contents that have herniated or incarcerated, possible sequelae include enophthalmos, diplopia, dystopia, and entrapment. Surgical intervention aims to prevent or alleviate this through the use of a bone graft or an alloplastic implant to reconstitute the continuity of the orbit. However, in doing so, the implant itself may result in the unexpected adherence of the periorbita, resulting in orbital adherence syndrome...
March 2017: Craniomaxillofacial Trauma & Reconstruction
Seunggeol Ryu, Prosenjit Sen, Youngsuk Nam, Choongyeop Lee
When a water drop impacts a mesh having submillimeter pores, a part of the drop penetrates through the mesh if the impact velocity is sufficiently large. Here we show that different surface wettability, i.e., hydrophobicity and superhydrophobicity, leads to different water penetration dynamics on a mesh during drop impact. We show, despite the water repellence of a superhydrophobic surface, that water can penetrate a superhydrophobic mesh more easily (i.e., at a lower impact velocity) over a hydrophobic mesh via a penetration mechanism unique to a superhydrophobic mesh...
January 6, 2017: Physical Review Letters
Patrick O Sorensen, Pamela H Templer, Lynn Christenson, Jorge Duran, Timothy Fahey, Melany C Fisk, Peter M Groffman, Jennifer L Morse, Adrien C Finzi
Snow cover is projected to decline during the next century in many ecosystems that currently experience a seasonal snowpack. Because snow insulates soils from frigid winter air temperatures, soils are expected to become colder and experience more winter soil freeze-thaw cycles as snow cover continues to decline. Tree roots are adversely affected by snowpack reduction, but whether loss of snow will affect root-microbe interactions remains largely unknown. The objective of this study was to distinguish and attribute direct (e...
December 2016: Ecology
K C Nune, A Kumar, R D K Misra, S J Li, Y L Hao, R Yang
We elucidate here the osteoblasts functions and cellular activity in 3D printed interconnected porous architecture of functionally gradient Ti-6Al-4V alloy mesh structures in terms of cell proliferation and growth, distribution of cell nuclei, synthesis of proteins (actin, vinculin, and fibronectin), and calcium deposition. Cell culture studies with pre-osteoblasts indicated that the interconnected porous architecture of functionally gradient mesh arrays was conducive to osteoblast functions. However, there were statistically significant differences in the cellular response depending on the pore size in the functionally gradient structure...
February 1, 2017: Colloids and Surfaces. B, Biointerfaces
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