Academic literature on the topic 'Fibrous biological membrane'
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Journal articles on the topic "Fibrous biological membrane"
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Borri-Brunetto, Mauro, Bernardino Chiaia, and Marco Deambrosi. "A Micromechanical Model for Fibrous Biological Membranes at Finite Strain." Journal of Biomimetics, Biomaterials and Tissue Engineering 3 (July 2009): 1–23. http://dx.doi.org/10.4028/www.scientific.net/jbbte.3.1.
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The mechanical model of a number of biological tissues is a membrane, i.e., a sheetlike structure with small thickness, where deformation and stress can be described locally in two dimensions. Many bio-membranes, particularly if subjected to large mechanical loads, present a fibrous structure, with stiff fibers, sometimes with preferential orientations, embedded in a more compliant matrix. Among this tissues are, e.g., the arterial walls, the amniotic membrane, and the skin. The stiff fibers, typically made of collagen, are initially wrinkled and they follow the deformation of the embedding matrix without contributing to the mechanical response until they are fully distended. In this paper, the response of a fibrous membrane is described in the framework of hyperelasticity, with aim to the implementation in an existing finite element code. A micro-mechanical recruitment model, based on the statistical distribution of the activation stretch of the collagen fibers is introduced, leading to the definition of a simple form of the strain-energy function, depending on physically well-defined parameters. After some validation tests performed in homogeneous strain conditions, an application to the study of the stress field around circular holes in large deformation is presented, showing the capabilities of the proposed model.
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Wu, Sijia, Longhe Yang, and Junde Chen. "Preparation and Characterization of Tilapia Collagen-Thermoplastic Polyurethane Composite Nanofiber Membranes." Marine Drugs 20, no. 7 (June 30, 2022): 437. http://dx.doi.org/10.3390/md20070437.
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Marine collagen is an ideal material for tissue engineering due to its excellent biological properties. However, the limited mechanical properties and poor stability of marine collagen limit its application in tissue engineering. Here, collagen was extracted from the skin of tilapia (Oreochromis nilotica). Collagen-thermoplastic polyurethane (Col-TPU) fibrous membranes were prepared using tilapia collagen as a foundational material, and their physicochemical and biocompatibility were investigated. Fourier transform infrared spectroscopy results showed that thermoplastic polyurethane was successfully combined with collagen, and the triple helix structure of collagen was retained. X-ray diffraction and differential scanning calorimetry results showed relatively good compatibility between collagen and TPU.SEM results showed that the average diameter of the composite nanofiber membrane decreased with increasing thermoplastic polyurethane proportion. The mechanical evaluation and thermogravimetric analysis showed that the thermal stability and tensile properties of Col-TPU fibrous membranes were significantly improved with increasing TPU. Cytotoxicity experiments confirmed that fibrous membranes with different ratios of thermoplastic polyurethane content showed no significant toxicity to fibroblasts; Col-TPU fibrous membranes were conducive to the migration and adhesion of cells. Thus, these Col-TPU composite nanofiber membranes might be used as a potential biomaterial in tissue regeneration.
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Ha, Sung Hoon, Soo Jin Kim, Hyoungjun Kim, Chae Won Lee, Kyu Hang Shin, Hae Won Park, Soonwoo Kim, et al. "Fibrous all-in-one monolith electrodes with a biological gluing layer and a membrane shell for weavable lithium-ion batteries." Journal of Materials Chemistry A 6, no. 15 (2018): 6633–41. http://dx.doi.org/10.1039/c8ta01405a.
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Ramírez-Cedillo, Erick, Wendy Ortega-Lara, María Rocha-Pizaña, Janet Gutierrez-Uribe, Alex Elías-Zúñiga, and Ciro Rodríguez. "Electrospun Polycaprolactone Fibrous Membranes Containing Ag, TiO2 and Na2Ti6O13 Particles for Potential Use in Bone Regeneration." Membranes 9, no. 1 (January 10, 2019): 12. http://dx.doi.org/10.3390/membranes9010012.
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Biocompatible and biodegradable membrane treatments for regeneration of bone are nowadays a promising solution in the medical field. Bioresorbable polymers are extensively used in membrane elaboration, where polycaprolactone (PCL) is used as base polymer. The goal of this work was to improve electrospun membranes’ biocompatibility and antibacterial properties by adding micro- and nanoparticles such as Ag, TiO2 and Na2Ti6O13. Micro/nanofiber morphologies of the obtained membranes were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy, energy-dispersive X-ray spectroscopy and a tensile test. Also, for this study optical microscopy was used to observe DAPI-stained cells. Membranes of the different systems were electrospun to an average diameter of 1.02–1.76 μm. To evaluate the biological properties, cell viability was studied by growing NIH/3T3 cells on the microfibers. PCL/TiO2 strength was enhanced from 0.6 MPa to 6.3 MPa in comparison with PCL without particles. Antibacterial activity was observed in PCL/TiO2 and PCL/Na2Ti6O13 electrospun membranes using Staphylococcus aureus bacteria. Bioactivity of the membranes was confirmed with simulated body fluid (SBF) treatment. From this study, the ceramic particles TiO2 and Na2Ti6O13, combined with a PCL matrix with micro/nanoparticles, enhanced cell proliferation, adhesion and antibacterial properties. The electrospun composite with Na2Ti6O13 can be considered viable for tissue regenerative processes.
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Prekajski, Marija, Biljana Babic, Dusan Bucevac, Jelena Pantic, Jelena Gulicovski, Miroslav Miljkovic, and Branko Matovic. "Synthesis and characterization of biomorphic CeO2 obtained by using egg shell membrane as template." Processing and Application of Ceramics 8, no. 2 (2014): 81–85. http://dx.doi.org/10.2298/pac1402081p.
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A new technology based on bio-templating approach was proposed in this paper. Egg-shell membrane (ESM) has been employed as a natural biotemplate. Fibrous oxide ceramics was prepared by wet impregnation of biological template with water solution of cerium nitrate. The template was derived from membranes of fresh chicken eggs. Repeated impregnation, pyrolysis and final calcination in the range of 600 to 1200?C in air resulted in template burnout and consolidation of the oxide layers. At low temperatures, the obtained products had structure which corresponded to the negative replication of biological templates. Unique bio-morphic CeO2 microstructures with interwoven networks were synthesized and characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), whereas low-temperature nitrogen adsorption (BET) method was used in order to characterize porous properties.
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Liu, Shuo, Ji Fu Wang, Bao Zhen Wang, Bing Wang, and Wei Wan. "Pilot Scale Study on Biological Nutrient Removal and Membrane Fouling Alleviation in Combined Membrane Bioreactor for Municipal Wastewater Treatment." Advanced Materials Research 365 (October 2011): 354–60. http://dx.doi.org/10.4028/www.scientific.net/amr.365.354.
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To solve the problem of eutrophication in receiving water, a novel Membrane Bioreactor (MBR) with combined configuration was designed for municipal wastewater treatment and reclamation. By dividing bioreactor into three zones, the combined MBR operated under anoxic, anaerobic and aerobic conditions. It provided optimum conditions for nitrification, denitrifying and phosphate accumulating bacterial growth which resulted in high biological nutrient removal rate directly. The operational performance of combined MBR pilot plant showed that it exhibited high nutrient removal rate on Chemical oxygen demand (CODcr), total nitrogen (TN) and total phosphorus (TP). The mean value of effluent CODcr, TN and TP removal rate was 90.63%, 63.05% and 60.51% respectively during 180 days of operation. In order to obtain stable membrane flux, the combined MBR packed with fibrous bio-film carrier and added diatomite. Furthermore, it could alleviate membrane fouling effectively. As a result, the combined MBR improved effluent water quality significantly and alleviated membrane fouling remarkably.
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Owston, Heather E., Katrina M. Moisley, Giuseppe Tronci, Stephen J. Russell, Peter V. Giannoudis, and Elena Jones. "Induced Periosteum-Mimicking Membrane with Cell Barrier and Multipotential Stromal Cell (MSC) Homing Functionalities." International Journal of Molecular Sciences 21, no. 15 (July 23, 2020): 5233. http://dx.doi.org/10.3390/ijms21155233.
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The current management of critical size bone defects (CSBDs) remains challenging and requires multiple surgeries. To reduce the number of surgeries, wrapping a biodegradable fibrous membrane around the defect to contain the graft and carry biological stimulants for repair is highly desirable. Poly(ε-caprolactone) (PCL) can be utilised to realise nonwoven fibrous barrier-like structures through free surface electrospinning (FSE). Human periosteum and induced membrane (IM) samples informed the development of an FSE membrane to support platelet lysate (PL) absorption, multipotential stromal cells (MSC) growth, and the prevention of cell migration. Although thinner than IM, periosteum presented a more mature vascular system with a significantly larger blood vessel diameter. The electrospun membrane (PCL3%-E) exhibited randomly configured nanoscale fibres that were successfully customised to introduce pores of increased diameter, without compromising tensile properties. Additional to the PL absorption and release capabilities needed for MSC attraction and growth, PCL3%-E also provided a favourable surface for the proliferation and alignment of periosteum- and bone marrow derived-MSCs, whilst possessing a barrier function to cell migration. These results demonstrate the development of a promising biodegradable barrier membrane enabling PL release and MSC colonisation, two key functionalities needed for the in situ formation of a transitional periosteum-like structure, enabling movement towards single-surgery CSBD reconstruction.
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Giragosyan, Krikor, Ivan Chenchev, Vasilena Ivanova, and Stefan Zlatev. "Immunological response to nonresorbable barrier membranes used for guided bone regeneration and formation of pseudo periosteum: a narrative review." Folia Medica 64, no. 1 (February 28, 2022): 13–20. http://dx.doi.org/10.3897/folmed.64.e60553.
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Here we review the knowledge on the local biological immunological response (formation of “pseudo periosteum” of the host) to two types of nonresorbable membranes used in the horizontal and vertical alveolar ridge augmentation: the titanium-reinforced polytetrafluoroethylene membrane and the titanium mesh membrane. A literature search was conducted including available in vitro, in vivo, and clinical studies on cellular and molecular immunological response to these two types of nonresorbable membranes, in particular the formation of “pseudo periosteum”. Emerging data demonstrates that despite barrier membranes being considered as bioinert, they still elicit an immunological response from the body. The outcome of this reaction is the formation of a thin fibrous capsule referred to as “pseudo periosteum”. There are almost no biomaterials that are truly bioinert and this makes no exception for the nonresorbable membranes used in the guided bone regeneration. This iatrogenically made tissue is hypothesized to have a number of advantages and drawbacks. However, more research is needed in that area to truly understand its nature and importance to the guided bone regeneration process.
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Fiorito, Silvana, Laura Magrini, and Robert Streicher. "Circulating Cytokines as Biological Indicators for PE and Ceramics Articulations." Key Engineering Materials 361-363 (November 2007): 1323–26. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.1323.
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We studied the role of cytokines (TNF-α, IL-6,IL-1β, TGF-β) as markers of osteolysis in patients who underwent to a hip prosthesis implantation subdivided in two groups: group A with an ultrahigh molecular weight polyethylene (UHMWPE) insert articulating against a metal ball head , and group B with an all alumina ceramic combination. Profibrogenic (TGF-β) and pro-inflammatory cytokines (TNF-α, IL-6,IL-1β) are secreted by the periprosthetic synovial-like fibrous membrane in hip artificial implants. They are secreted by inflammatory activated cells and trigger the cascade of biochemical events leading to the activation of osteoclasts and bone resorption. A statistically significant increase of TGF-β serum levels was observed between TGF-β values in implanted patients as compared to normal subjects and between TGF-β values after versus before implantation in Group A. A progressive decrease in TNF-α and IL-6 serum levels has been observed in both Groups, when compared with the initial values before the implantation. IL-1β levels decreased up to 60 months after the implantation Our data suggest that monitoring circulating cytokines could be a good indicator for the proliferation and activity of the periprosthetic synovial-like membrane and potential osteolysis. This could allow for an adequate early treatment.
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Goldberg, Martin W., and Terence D. Allen. "HRSEM of the nuclear envelope (NE): Nuclear pore substructure; baskets and fibrous components." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 1 (August 1992): 492–93. http://dx.doi.org/10.1017/s0424820100122861.
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The nuclear envelope (NE) of eukaryotic cells has been studied for many years by a variety of em techniques yielding a three dimensional model of the nuclear pore complex (NPC) consisting of two rings (∼120nm diameter), one at the outer NE and one at the inner NE. Between the rings are eight spoke structures and a central plug. The cytoplasmic ring may be decorated with up to eight particles. The NPCs are embedded in a proteinaceous network: the nuclear lamina. Recently, low voltage HRSEM was used to show the existence of a basket-like structure attached to the nucleoplasmic ring. SEM is an ideal technique for the study of membrane surfaces. High resolution can be achieved in SEMs by the use of a field emission source which produces a high brightness probe of less than lnm diameter and a specimen stage within the objective lens, reducing chromatic abberations and production of SEIII electrons. Resolution of biological specimens can be further enhanced by coating with thin, continuous films of refractory metals such as chromium or tantalum which allows the use of higher accelerating voltages and magnifications. The NEs of Xenopus oocyte germinal vesicles have been prepared as previously described for HRSEM without detergent except they have been coated nominally with 3nm of tantalum by magnetron sputtering instead of ion beam sputtered platinum. NEs have then been examined at 30kV. The ring, plug/spoke complex and particles can all be seen at the cytoplasmic surface as well as details of the outer membrane structure and particles associated with it (Fig. 1). On the nucleoplasmic surface (Fig. 2) the inner ring is observed. It has a subunit appearance with eight filaments extending from between the subunits to a third ring structure: these make up the basket-like structure. When ‘baskets’ are close together they are joined by fibres at the ‘basket ring’ (Fig. 2). When several baskets are in close proximity these fibres form a network like a canopy over the baskets (Fig. 3). Other fibres are present on the inner membrane surface which may be membrane associated fibres or canopy fibres that have collapsed. It is uncertain which, if any, of these fibres are lamins as a further level of fibres is observed at the level of the nucleoplasmic ring when the membrane is removed with detergent (Fig. 4). These fibres are consistent with previously described lamina.
Dissertations / Theses on the topic "Fibrous biological membrane"
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Sednieva, Yuliia. "Caractérisation mécanique du fascia lata et contribution à sa modélisation numérique." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSE1326.
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Les pathologies du genou liées au sport sont nombreuses et impliquent, pour partie, la bandelette iliotibiale (ITT). Il s’agit d’un renforcement d’une partie du fascia profond de la cuisse, nommé fascia lata. Le fascia lata est un tissu conjonctif fibreux composé de fibres d’élastine et de réseaux de fibres de collagène présents dans différentes couches de tissu. Il a un rôle stabilisateur de l’articulation et permet le transfert des efforts entre les muscles, mais les propriétés et mécanismes de déformation de ce tissu restent mal connus. Dans ce contexte, les mécanismes de déformation du fascia lata lors de mouvements physiologiques du genou ont été étudiés. Des données quantitatives des champs de déformation du fascia lata ont été obtenues in situ mettant en évidence des mécanismes de déformation en traction, compression et aussi cisaillement. Par conséquent, le comportement mécanique d’échantillons isolés de fascia lata a été analysé avec des essais de cisaillement de type large bande et traction de biais, incluant l'étude de la cinématique des fibres de collagène. Une première contribution à la modélisation en éléments finis du comportement du fascia a également été proposée. Enfin, comme l'état de déformation naturel du fascia lata contribue à une bonne mobilité du genou, une étude in situ a été mise en place pour évaluer l'impact sur les déformations du fascia et mobilités articulaires d'une technique chirurgicale de relâchement des tensions, dite de pie-crusting appliquée à l’ITT et pouvant être recommandée dans des cas pathologiques. L’ensemble du travail réalisé apporte donc de nouveaux éléments dans l'étude du comportement mécanique du fascia lataThere are many sports-related knee injuries, some of which involve the iliotibial band (ITT). This is a thicker part of the deep fascia of the thigh, called fascia lata. The fascia lata is a fibrous connective tissue composed of elastin fibers and networks of collagen fibers present in different layers of tissue. It has a stabilizing role in the joint and allows the transfer of forces between muscles, but its properties and strain mechanisms remain poorly understood. In this context, the strain mechanisms of the fascia lata during physiological knee movements were studied. Quantitative data of fascia lata strain fields were obtained in situ highlighting strain mechanisms in tension, compression, and shear. Therefore, the mechanical behavior of isolated fascia lata samples was analyzed with shear tests such as bias extension tests and traction of a large band tissue. The study of collagen fiber kinematics was also included. A first contribution to the finite element modelling of fascia behavior was also proposed. Finally, as the natural state of deformation of the fascia lata contributes to good knee mobility, an in situ study was set up to evaluate the impact on joint mobility and strain levels on fascia of a surgical tension-release technique, known as pie-crusting, applied to the ITT and which may be recommended in pathological cases. All the work carried out therefore provides new elements in the study of the mechanical behavior of fascia lata
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Xie, Fangyou. "Pressure Driven Desalination Utilizing Nanomaterials." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2204.
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Nanomaterials such as graphene oxide and carbon nanotubes, have demonstrated excellent properties for membrane desalination, including decrease of maintenance, increase of flux rate, simple solution casting, and impressive chemical inertness. Here, two projects are studied to investigate nanocarbon based membrane desalination. The first project is to prepare hybrid membranes with amyloid fibrils intercalated with graphene oxide sheets. The addition of protein amyloid fibrils expands the interlayer spacing between graphene oxide nanosheets and introduces additional functional groups in the diffusion pathways, resulting in increase of flux rate and rejection rate for the organic dyes. Amyloid fibrils also provide structural assistance to the hybrid membrane, which supresses cracking and instability of graphene oxide sheets. The second project is to fabricate polymer nanocomposite membranes with carbon nanotubes encapsulated by polymerized surfactants. The designed polymerizable surfactant forms lyotropic liquid crystalline mesophases in an aqueous medium with hexagonal packing of cylindrical micelles. The adsorption of surfactants on the surface of carbon nanotubes allows a stable dispersion of carbon nanotubes encapsulated in the cylindrical micelles, resulting in the ordered structure. After photo-polymerization, the composite membranes display enhanced dye rejection. Both projects have shown promising ways to improve membrane filtration by using nanomaterials.