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https://www.readbyqxmd.com/read/29752092/a-novel-porous-bioceramic-scaffold-by-accumulating-hydroxyapatite-spheres-for-large-bone-tissue-engineering-iii-characterization-of-porous-structure
#1
Jingwei Zhang, Dongqin Xiao, Xu He, Feng Shi, Pinfeng Luo, Wei Zhi, Ke Duan, Jie Weng
Physical characteristics of bone tissue engineering scaffolds, including interconnectivity, microporosity, macroporosity, and pore geometry are known to play a crucial role in bone regeneration. In the present study, three-dimensional (3D) interconnected scaffolds were prepared by accumulating hydroxyapatite (HA) spheres in a titanium mesh tube (ф 1.5 × 3 cm). Three types of porous scaffolds were constructed using HA spheres with diameters of 1651-1981 μm, 830-1180 μm and a mixture of 1651-1981 μm and 830-1180 μm at a volumetric ratio of 1:1, respectively...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29720410/mammoth-grazers-on-the-ocean-s-minuteness-a-review-of-selective-feeding-using-mucous-meshes
#2
REVIEW
Keats R Conley, Fabien Lombard, Kelly R Sutherland
Mucous-mesh grazers (pelagic tunicates and thecosome pteropods) are common in oceanic waters and efficiently capture, consume and repackage particles many orders of magnitude smaller than themselves. They feed using an adhesive mucous mesh to capture prey particles from ambient seawater. Historically, their grazing process has been characterized as non-selective, depending only on the size of the prey particle and the pore dimensions of the mesh. The purpose of this review is to reverse this assumption by reviewing recent evidence that shows mucous-mesh feeding can be selective...
May 16, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29689444/changes-in-the-physical-properties-of-the-dynamic-layer-and-its-correlation-with-permeate-quality-in-a-self-forming-dynamic-membrane-bioreactor
#3
Dao Guan, Ji Dai, Yoshimasa Watanabe, Guanghao Chen
The self-forming dynamic membrane bioreactor (SFDMBR) is a biological wastewater treatment technology based on the conventional membrane bioreactor (MBR) with membrane material modification to a large pore size (30-100 μm). This modification requires a dynamic layer formed by activated sludge to provide effective filtration function for high-quality permeate production. The properties of the dynamic layer are therefore important for permeate quality in SFDMBRs. The interaction between the structure of the dynamic layer and the performance of SFDMBRs is little known but understandably complex...
April 18, 2018: Water Research
https://www.readbyqxmd.com/read/29643952/parastomal-hernia-current-knowledge-and-treatment
#4
REVIEW
Roman Styliński, Adam Alzubedi, Sławomir Rudzki
Intestinal stoma creation is one of the most common surgical procedures. The most common long-term complication following stoma creation is parastomal hernia, which according to some authors is practically unavoidable. Statistical differences of its occurrence are mainly due to patient observation time and evaluation criteria. Consequently, primary prevention methods such as placement of prosthetic mesh and newly developed minimally invasive methods of stoma creation are used. It seems that in the light of evidence-based medicine, the best way to treat parastomal hernia is the one that the surgeon undertaking therapy is the most experienced in and is suited to the individuality of each patient, his condition and comorbidities...
March 2018: Wideochirurgia i Inne Techniki Mało Inwazyjne, Videosurgery and Other Miniinvasive Techniques
https://www.readbyqxmd.com/read/29525092/a-novel-layer-structured-scaffold-with-large-pore-sizes-suitable-for-3d-cell-culture-prepared-by-near-field-electrospinning
#5
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
https://www.readbyqxmd.com/read/29477848/assessment-of-dynamic-membrane-filtration-for-biological-treatment-of-old-landfill-leachate
#6
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...
May 1, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29368249/synthesis-and-characterisation-of-photocrosslinked-poly-ethylene-glycol-diacrylate-implants-for-sustained-ocular-drug-delivery
#7
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
https://www.readbyqxmd.com/read/29314586/novel-large-pore-lightweight-polypropylene-mesh-has-better-biocompatibility-for-rat-model-of-hernia
#8
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)...
May 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29225490/fluid-flow-in-porous-media-using-image-based-modelling-to-parametrize-richards-equation
#9
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
https://www.readbyqxmd.com/read/29224706/prophylactic-placement-of-permanent-synthetic-mesh-at-the-time-of-ostomy-closure-prevents-formation-of-incisional-hernias
#10
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...
April 2018: Surgery
https://www.readbyqxmd.com/read/28803112/in-vivo-documentation-of-shape-and-position-changes-of-mri-visible-mesh-placed-in-rectovaginal-septum
#11
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
https://www.readbyqxmd.com/read/28634690/long-term-retromuscular-and-intraperitoneal-mesh-size-changes-within-a-randomized-controlled-trial-on-incisional-hernia-repair-including-a-review-of-the-literature
#12
RANDOMIZED CONTROLLED TRIAL
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
https://www.readbyqxmd.com/read/28580973/the-particle-in-the-spider-s-web-transport-through-biological-hydrogels
#13
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
https://www.readbyqxmd.com/read/28513137/hierarchical-porous-carbon-doped-with-iron-nitrogen-sulfur-for-efficient-oxygen-reduction-reaction
#14
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
https://www.readbyqxmd.com/read/28462361/estimation-of-anisotropic-permeability-in-trabecular-bone-based-on-microct-imaging-and-pore-scale-fluid-dynamics-simulations
#15
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
https://www.readbyqxmd.com/read/28395964/inertial-cavitation-ultrasound-with-microbubbles-improves-reperfusion-efficacy-when-combined-with-tissue-plasminogen-activator-in-an-in-vitro-model-of-microvascular-obstruction
#16
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
https://www.readbyqxmd.com/read/28388096/detergency-and-its-implications-for-oil-emulsion-sieving-and-separation
#17
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
https://www.readbyqxmd.com/read/28347956/a-foam-model-highlights-the-differences-of-the-macro-and-microrheology-of-respiratory-horse-mucus
#18
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...
July 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28278776/novel-application-of-high-density-polyethylene-mesh-as-self-forming-dynamic-membrane-integrated-into-a-bioreactor-for-wastewater-treatment
#19
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...
January 2018: Environmental Technology
https://www.readbyqxmd.com/read/28258383/-retracted-article-new-worldwide-guidelines-for-treatment-of-inguinal-hernia-the-most-important-recommendations-from-herniasurge
#20
D Weyhe
No abstract text is available yet for this article.
July 2017: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
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