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PubMed Journals Articles About "Manipulation Fibril Surfaces Nanocellulose Based Hybrid Facilitated Transport" RSS

08:23 EDT 20th September 2019 | BioPortfolio

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Showing "Manipulation Fibril Surfaces Nanocellulose based Hybrid Facilitated Transport" PubMed Articles 1–25 of 38,000+

Manipulation of Fibril Surfaces in Nanocellulose-based Hybrid Facilitated Transport Membranes for Enhanced CO2 Capture.

Nanocellulose is attracting more and more interests as a nanoscale 1D additive in polymeric membranes due to its natural availability, high aspect ratio, tunable surface, and excellent mechanical properties. In this work, an effective way to modify nanocellulose fibril surfaces for performance enhancement in CO2 separation membranes has been demonstrated. The functionalization promptly triggered intrinsic property responses in favour of nanofiber dispersion and CO2 transport. Thin composite membranes contai...


Printability of pulp derived crystal, fibril and blend nanocellulose-alginate bioinks for extrusion 3D bioprinting.

One of the main challenges for extrusion 3D bioprinting is the identification of non-synthetic bioinks with suitable rheological properties and biocompatibility. Our aim was to optimise and compare the printability of crystal, fibril and blend formulations of novel pulp derived nanocellulose bioinks and assess biocompatibility with human nasoseptal chondrocytes for cartilage bioprinting. Methods: The printability of crystalline, fibrillated and blend formulations of nanocellulose was determined ...

Separation of floating oil drops based on drop-liquid substrate interfacial tension.

Though various strategies exist for the transport of oil drops suspended on a liquid substrate, selective manipulation of different kind of drops based on their respective characteristics remains a challenge. In practical, it is possible to have multiple drops having different wetting states with the liquid substrate, whose separation is desired. In this work, we exploit curvature induced capillary forces for the selective manipulation (transport as well as separation) of oil droplets based on their interfa...


α-Helical Motif as Inhibitors of Toxic Amyloid-β Oligomer Generation via Highly Specific Recognition of Amyloid Surface.

Amyloid fibril surfaces can convert soluble proteins into toxic oligomers and are attractive targets for intervention of protein aggregation diseases. Thus far, molecules identified with inhibitory activity are either large proteins or flat cyclic compounds lacking in specificity. The main design difficulty is flatness of amyloid surfaces and the lack of knowledge on binding interfaces. Here, we demonstrate, for the first time, a rational design of alpha-helical peptide inhibitors targeting the amyloid-beta...

Skeletal myotube formation enhanced through fibrillated collagen nanofibers coated on a 3D-printed polycaprolactone surface.

This work focused on considering the cellular responses of the growth and differentiation of myoblasts, C2C12, on fibrillated collagen-coated poly(ε-caprolactone) (PCL) surfaces. Through a fibrillation processing window using NaCl and collagen weight fractions, collagen fibril coating density can be controlled. Three different collagen-fibril densities coated on PCL strut were used to investigate the effects of the collagen fibril on the myoblast activities. After physical and cellular analyses of the scaf...

Fabrication and Evaluation of Bio-based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 capture.

Nanocellulose is a promising and sustainable bio-based nanomaterial due to its excellent mechanical properties, biocompatibility, natural abundance, and especially its high aspect ratio. Interest in applying nanocellulose as nanofillers in membrane fabrication has been growing rapidly in recent years. In the present work, nanocellulose crystals (CNC) and nanocellulose fibers (CNF) were incorporated into polyvinyl alcohol (PVA) to prepare evenly dispersed nanocomposite. The resultant nanocomposite materials ...

Synthesis of silica/polypeptide hybrid nanomaterials and mesoporous silica by molecular replication of sheet-like polypeptide complexes through biomimetic mineralization.

Biomimetic synthesis of silica/polymer hybrid nanomaterials inspired by silica-condensing microorganisms has gained significant advances in recent years and the as-prepared hybrid materials have been explored for a variety of applications. In this work, silica/polypeptide hybrid nanoparticles (NPs) and coating films can be facilely fabricated by silica mineralization of poly(l-lysine)-block-poly(l-threonine)/poly(l-glutamic acid) (PLL-b-PLT/PGA) fibril complexes assembled in solutions or on substrates at be...

Non-equilibrium hybrid organic plasma processing for superhydrophobic PTFE surface towards potential bio-interface applications.

Superhydrophobic surfaces have gained increased attention due to the high water-repellency and self-cleaning capabilities of these surfaces. In the present study, we explored a novel hybrid method of fabricating superhydrophobic poly(tetrafluoroethylene) (PTFE) surfaces by combining the physical etching capability of oxygen plasma with the plasma-induced polymerization of a organic monomer methyl methacrylate (MMA). This novel hybrid combination of oxygen-MMA plasma has resulted in the generation of superhy...

Plant-derived Nanocellulose as Structural and Mechanical Reinforcement of Freeze-Cast Chitosan Scaffolds for Biomedical Applications.

Despite considerable recent interest in micro- and nanofibrillated cellulose as constituents of lightweight structures and scaffolds for applications that range from thermal insulation to filtration, few systematic studies have been reported to date on structure-property-processing correlations in freeze-cast chitosan-nanocellulose composite scaffolds, in general, and their application in tissue regeneration, in particular. Reported in this study are the effects of the addition of plant-derived nanocellulos...

PVA/(ligno)nanocellulose biocomposite films. Effect of residual lignin content on structural, mechanical, barrier and antioxidant properties.

Nanocelluloses with and without residual lignin were isolated from wheat straw. In addition, the effect of TEMPO-mediated oxidation on the production of lignin-containing nanocellulose was studied. The different nanocelluloses were used as reinforcing agent in Poly(vinyl alcohol) films. The morphology, crystallinity, surface microstructure, barrier properties, light transmittance, mechanical and antioxidant properties were evaluated. The translucency of films was reduced by the addition of nanocellulose, ho...

Transport of a sessile aqueous droplet over spikes of oil based ferrofluid in presence of a magnetic field.

Droplets can be used as carrier vehicles for the transportation of biological and chemical reagents. Manipulation of water- and oil- based ferromagnetic droplets in presence of magnetic field have been well-studied. Here, we elucidate the transport of a sessile aqueous (diamagnetic) droplet placed over spikes of oil-based ferrofluid (FF) in presence of a non-uniform magnetic field. An oil-based FF droplet, dispensed over a rigid oleophilic surface, interacts with a magnetic field to get transformed into an ...

Surface Modification with Gallium Coating as Non-wetting Surfaces for Gallium-based Liquid Metal Droplet Manipulation.

We report gallium (Ga) coating as a simple approach to convert most common microfluidic substrates to non-wetting surfaces against surface-oxidized gallium-based liquid metal alloys. These alloys are readily oxidized in ambient air and adhere to almost all surfaces, which imposes significant challenges in mobilizing liquid metal droplets without leaving residue. Various flat substrates (e.g., PDMS, Si, SiO, SU-8, glass, and parylene-C coated PDMS) were coated with thin film (75 ~ 200 nm in thickness) of gal...

Engineering nanocellulose hydrogels for biomedical applications.

Nanocellulose hydrogels are highly hydrated porous cellulosic soft materials with good mechanical properties. These cellulose-based gels can be produced from bacterial or plant cellulose nanofibrils, which are hydrophilic, renewable, biodegradable and biocompatible. Nanocellulose, whether fibrils (CNF), crystals (CNC) or bacterial (BNC), has a high aspect ratio and surface area, and can be chemically modified with functional groups or by grafting biomolecules. Cellulose functionalization provides enhanced p...

Clean interface without any intermixed state between ultra-thin P3 polymer and CHNHPbI hybrid perovskite thin film.

Hole transport layers (HTL) are crucial materials to improve the power conversion efficiency in organohalide hybrid perovskite-based solar-cell applications. Two important physical properties are required in HTL materials: good hole mobility and air-protection. After HTL solution-based deposition, an intermixed chemical state at the interface between HTL and hybrid perovskite is key to confirming the physical property of HTL. We performed high-resolution x-ray photoelectron spectroscopy to investigate the c...

Novel hybrid liposomal formulations based on imidazolium-containing amphiphiles for drug encapsulation.

Novel liposomes based on 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and imidazolium-containing amphiphiles with various length of hydrophobic tail at various molar ratio of components have been fabricated. Obtained formulations were characterized using dynamic and electrophoretic light scattering as well as transmission electron microscopy techniques. It has been established, that DPPC liposomes modification by these cationic amphiphiles resulted in zeta potential increase from +3 mV to +45-70 m...

Biological Macrocycle: Supramolecular Hydrophobic Guest Transport System based on Nanodisc with Photodynamic Activity.

A biogenic macrocycle-based guest loading system has been developed by the self-assembly of membrane scaffold protein and phospholipids. The resulting 10 nm level transport system can increase the solubility of hydrophobic photodynamic agent hypocrellin B in aqueous medium, and exhibited cellular internalization capacity with substantial photodynamic activity.

Nanoscale Structural Organization of Insulin Fibril Polymorphs Revealed By Atomic Force Microscope Infrared Spectroscopy (AFM-IR).

Spontaneous aggregation of misfolded proteins typically results in formation morphologically and structurally different amyloid fibrils, protein aggregates that are strongly associated with various neurodegenerative disorders. Elucidation of structural organization of amyloid aggregates is crucial for the understanding of their role in onset and progression of these diseases. Using atomic force microscopy infrared spectroscopy (AFM-IR), we investigated structural organization of insulin fibrils. We found th...

An analytical model of bubble-facilitated vapor intrusion.

Mass transfer from nonaqueous phase liquid (NAPL) to entrapped air induced by a fluctuating water table commonly occurs in residual NAPL zones in aquifers. Gas bubble expansion and vertical migration due to interphase mass transfer could facilitate the upward transport of volatile organic compounds (VOCs) in the aquifer and result in higher mass fluxes into a building relative to those of diffusion-limited (D-L) VOC transport. However, the current vapor intrusion models have not considered bubble migration....

Biofabrication of bacterial nanocellulose scaffolds with complex vascular structure.

Bacterial nanocellulose (BNC) has proven to be an effective hydrogel-like material for different tissue engineering applications due to its biocompatibility and good mechanical properties. However, as for all biomaterials, in vitro biosynthesis of large tissue constructs remains challenging due to insufficient oxygen and nutrient transport in engineered scaffold-cell matrices. In this study we designed, biofabricated and evaluated bacterial nanocellulose scaffolds with a complex vascular mimetic lumen struc...

Characterization of lipid emulsions during in vitro digestion in the presence of three types of nanocellulose.

Nanocellulose (NC) has been a topic of significant interest due to its multiple applications, including that as a potential food ingredient. Due to the viscous property of NC and its potential use as emulsion stabilizers, presence of NC in food may affect properties and digestion of lipid emulsions systems. In this study, the behavior of three types of nanocellulose and its influence on lipid emulsions during digestion were investigated.

An Efficient Design for High-Energy and High-Power Capability Hybrid Electric Power Device with Enhanced Electrochemical Interfaces.

Fabrication of novel electrode architectures with tailored electrochemical interfaces is an effective strategy for enhancing charge and mass transport processes within electrochemical devices. Here, we design and fabricate a well-hybrid electrode based on the coupling of polyaniline (PANI) nanowires and Pt-based electrocatalysts to manufacture a hybrid electric power device (HEPD) combining with advantages of supercapacitors and fuel cells. Due to the boosted charge transfer between PANI nanowires and Pt-ba...

Network-Based Classification and Modeling of Amyloid Fibrils.

Amyloid fibrils are locally ordered protein aggregates that self-assemble under a variety of physiological and in vitro conditions. Their formation is of fundamental interest as a physical chemistry problem and plays a central role in Alzheimer's disease, Type II diabetes, and other human diseases. As the number of known amyloid fibril structures has grown, the need has arisen for a nomenclature for describing and classifying fibril types, as well as a theoretical description of the physics that gives rise ...

Inducible Fibril Formation of Silk-Elastin Diblocks.

Silk-elastin block copolymers have such physical and biological properties that make them attractive biomaterials for applications ranging from tissue regeneration to drug delivery. Silk-elastin block copolymers that only assemble into fibrils at high concentrations can be used for a template-induced fibril assembly. This can be achieved by additionally including template-binding blocks that promote high local concentrations of polymers on the template, leading to a template-induced fibril assembly. We hypo...

Spectroscopic evidence of tertiary structural differences between insulin molecules in fibrils.

Protein fibrils are of great interest due to their involvement in several pathologies, and their roles in the degradation of many therapeutic protein products. Fibrils share highly similar secondary structural motifs across different proteins and applied stress conditions. However, fibril morphology differs according to the surrounding conditions, with aromatic and hydrophobic amino acids playing important roles in mature fibril formation. In this study, we use Raman microscopy, by means of the aromatic ami...

A universal assay for making DNA, RNA and RNA-DNA hybrid con-figurations for single-molecule manipulation in two or three steps without ligation.

Despite having a great variety of the topologies, most DNA, RNA and RNA-DNA hybrid (RDH) configurations for single-molecule manipulation are composed by several single-stranded (ss) DNA and ssRNA strands, with functional labels at the two ends for surface tethering. On this basis, we developed a simple, robust and universal amplification-annealing (AA) assay for making all these configurations in two or three steps without the inefficient digestion and ligation reactions. As examples, we made ssDNA, short s...


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