Fine-Tuning of Physicochemical Properties and Growth Dynamics of Mycelium-Based Materials

2020 ◽  
Vol 3 (2) ◽  
pp. 1044-1051 ◽  
Author(s):  
Maria Elena Antinori ◽  
Luca Ceseracciu ◽  
Giorgio Mancini ◽  
José A. Heredia-Guerrero ◽  
Athanassia Athanassiou
Keyword(s):  
Physicochemical Properties ◽  
Growth Dynamics ◽  
Fine Tuning

Amorphous Calcium Phosphate Based Polymeric Composites: Effects of Polymer Composition and Filler's Particle Size on Composite Properties

2005 ◽  
Vol 284-286 ◽  
pp. 737-740 ◽  
Author(s):  
Drago Skrtic ◽  
S.Y. Lee ◽  
Joseph M. Antonucci ◽  
D.W. Liu
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Physicochemical Properties ◽  
Amorphous Calcium Phosphate ◽  
Fine Tuning ◽  
Polymer Composition ◽  
Ion Release ◽  
The Matrix ◽  
Carboxylic Groups ◽  
Composite Properties

This study explores how a) the resin grafting potential for amorphous calcium phosphate (ACP) and b) particle size of ACP affects physicochemical properties of composites. Copolymers and composites were evaluated for biaxial flexure strength (BFS), degree of vinyl conversion (DC), mineral ion release and water sorption (WS). Milled ACP composites were superior to unmilled ACP composites and exhibited 62 % and 77 % higher BFS values (dry and wet state, respectively). The average DC of copolymers 24 h after curing was 80 %. DC of composites decreased 10.3 % for unmilled Zr-ACP and 4.6 % for milled Zr-ACP when compared to the corresponding copolymers. The WS increased as follows: copolymers < milled Zr-ACP composites < unmilled Zr-ACP composites. The levels of Ca and PO4 released from both types of composites increased with the increasing EBPADMA/TEGDMA ratio in the matrix. They were significantly above the minimum necessary for the redeposition of HAP to occur. No significant consumption of released calcium by the carboxylic groups of methacryloxyethyl phtahalate (MEP) occurred at a mass fraction of 2.6 % of MEP in the resin. Improvements in ACP composite’s physicochemical properties are achieved by fine tuning of the resin and improved ACP’s dispersion within the polymer matrix after ball-milling.

Effect of the acid activation on a layered titanosilicate AM-4: The fine-tuning of structural and physicochemical properties

2020 ◽  
Vol 186 ◽  
pp. 105445 ◽  
Author(s):  
Maria N. Timofeeva ◽  
Galina O. Kalashnikova ◽  
Kristina I. Shefer ◽  
Elena A. Mel'gunova ◽  
Valentina N. Panchenko ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Fine Tuning ◽  
Acid Activation

Fine-tuning the physicochemical properties of peptide-based blood–brain barrier shuttles

2018 ◽  
Vol 26 (8) ◽  
pp. 2099-2106 ◽  
Author(s):  
Somaye Ghasemy ◽  
Júlia García-Pindado ◽  
Fatemeh Aboutalebi ◽  
Kianoush Dormiani ◽  
Meritxell Teixidó ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Blood Brain Barrier ◽  
Fine Tuning ◽  
Brain Barrier ◽  
Blood Brain

scholarly journals Defect levels coupled with oscillations and frustrated spins by Fe+3 in co-precipitated Aluminum ferrites

2022 ◽  
Author(s):  
Ritambhara Dash ◽  
Kumar Gaurav ◽  
Neha Kumari ◽  
Prashant Kumar ◽  
Saurabh Ranjan ◽  
...  
Keyword(s):  
Magnetic Property ◽  
Physicochemical Properties ◽  
Metal Oxides ◽  
Photocatalytic Degradation ◽  
Significant Role ◽  
Large Scale ◽  
Organic Dyes ◽  
Reaction System ◽  
Fine Tuning ◽  
Ion Concentration

Abstract The degradation of organic dyes determines the suitability of a photocatalyst for wastewater treatments. Metal oxides like TiO2, ZnO, CuO, Fe2O3, Ce2O3, and Al-doped Ni Ferrites can degrade dyes. However, fine-tuning of physicochemical properties of the reaction system and characteristics of the reactor plays a significant role in making photocatalytic degradation a large-scale activity. The photoactivity gets altered by altering the Fe+3 ion concentration. The mechanism behind such changes has been addressed here, along with a unique magnetic property of frustrated spins observed.

scholarly journals Magnetofection: A Reproducible Method for Gene Delivery to Melanoma Cells

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lara Prosen ◽  
Sara Prijic ◽  
Branka Music ◽  
Jaka Lavrencak ◽  
Maja Cemazar ◽  
...  
Keyword(s):  
Gene Expression ◽  
Physicochemical Properties ◽  
Plasmid Dna ◽  
Water Solution ◽  
Superparamagnetic Iron Oxide ◽  
Synthesis Temperature ◽  
Fine Tuning ◽  
Synthesis Procedure ◽  
Sulfate Salts ◽  
Co Precipitation

Magnetofection is a nanoparticle-mediated approach for transfection of cells, tissues, and tumors. Specific interest is in using superparamagnetic iron oxide nanoparticles (SPIONs) as delivery system of therapeutic genes. Magnetofection has already been described in some proof-of-principle studies; however, fine tuning of the synthesis of SPIONs is necessary for its broader application. Physicochemical properties of SPIONs, synthesized by the co-precipitation in an alkaline aqueous medium, were tested after varying different parameters of the synthesis procedure. The storage time of iron(II) sulfate salt, the type of purified water, and the synthesis temperature did not affect physicochemical properties of SPIONs. Also, varying the parameters of the synthesis procedure did not influence magnetofection efficacy. However, for the pronounced gene expression encoded by plasmid DNA it was crucial to functionalize poly(acrylic) acid-stabilized SPIONs (SPIONs-PAA) with polyethyleneimine (PEI) without the adjustment of its elementary alkaline pH water solution to the physiological pH. In conclusion, the co-precipitation of iron(II) and iron(III) sulfate salts with subsequent PAA stabilization, PEI functionalization, and plasmid DNA binding is a robust method resulting in a reproducible and efficient magnetofection. To achieve high gene expression is important, however, the pH of PEI water solution for SPIONs-PAA functionalization, which should be in the alkaline range.

scholarly journals Hydrodynamic stress and phenotypic plasticity of the zebrafish regenerating fin

2021 ◽  
Author(s):  
Paule Dagenais ◽  
Simon Blanchoud ◽  
David Pury ◽  
Catherine Pfefferli ◽  
Tinri Aegerter-Wilmsen ◽  
...  
Keyword(s):  
Developmental Process ◽  
Growth Dynamics ◽  
Feedback Mechanism ◽  
Fine Tuning ◽  
Distal Margin ◽  
Extrinsic Factors ◽  
Hydrodynamic Stress ◽  
Viscous Shear Stress ◽  
Viscous Shear ◽  
Locomotory Organ

Understanding how extrinsic factors modulate genetically encoded information to produce a specific phenotype is of prime scientific interest. In particular, the feedback mechanism between abiotic forces and locomotory organs during morphogenesis to achieve efficient movement is a highly relevant example of such modulation. The study of this developmental process can provide unique insights on the transduction of cues at the interface between physics and biology. Here, we take advantage of the natural ability of adult zebrafish to regenerate their amputated fins to assess its morphogenic plasticity upon external modulations. Using a variety of surgical and chemical treatments, we are able to induce phenotypic responses to the structure of the fin. Through the ablation of specific rays in regenerating caudal fins, we generate artificially narrowed appendages in which the fin cleft depth and the positioning of rays bifurcations are perturbed compared to normal regenerates. To dissect the role of mechanotransduction in this process, we investigate the patterns of hydrodynamic forces acting on the surface of a zebrafish fin during regeneration by using particle tracking velocimetry on a range of biomimetic hydrofoils. This experimental approach enables us to quantitatively compare hydrodynamic stress distributions over flapping fins of varying sizes and shapes. As a result, viscous shear stress acting on the distal margin of regenerating fins and the resulting internal tension are proposed as suitable signals for guiding the regulation of ray growth dynamics and branching pattern. Our findings suggest that mechanical forces are involved in the fine-tuning of the locomotory organ during fin morphogenesis.

scholarly journals Hydrodynamic stress and phenotypic plasticity of the zebrafish regenerating fin

2021 ◽  
Author(s):  
Paule Dagenais ◽  
Simon Blanchoud ◽  
David Pury ◽  
Catherine Pfefferli ◽  
Tinri Aegerter-Wilmsen ◽  
...  
Keyword(s):  
Developmental Process ◽  
Growth Dynamics ◽  
Feedback Mechanism ◽  
Fine Tuning ◽  
Stress Distributions ◽  
Extrinsic Factors ◽  
Hydrodynamic Stress ◽  
Viscous Shear Stress ◽  
Viscous Shear ◽  
Locomotory Organ

AbstractUnderstanding how extrinsic factors modulate genetically encoded information to produce a specific phenotype is of prime scientific interest. In particular, the feedback mechanism between abiotic forces and locomotory organs during morphogenesis to achieve efficient movement is a highly relevant example of such modulation. The study of this developmental process can provide unique insights on the transduction of cues at the interface between physics and biology. Here, we take advantage of the natural ability of adult zebrafish to regenerate their amputated fins to assess its morphogenic plasticity upon external modulations. Using a variety of surgical and chemical treatments, we are able to induce phenotypic responses to the structure of the fin. In particular, fin cleft depth and the bifurcation of the bony rays are modulated by the surface area of the stump. To dissect the role of mechanotransduction in this process, we investigate the patterns of hydrodynamic forces acting on the surface of a zebrafish fin during regeneration by using particle tracking velocimetry on a range of biomimetic hydrofoils. This experimental approach enables us to quantitatively compare hydrodynamic stress distributions over flapping fins of varying sizes and shapes. As a result, viscous shear stress acting on the tip of the fin and the resulting internal tension are proposed as suitable signals for guiding the regulation of ray growth dynamics and branching pattern. Our findings suggest that mechanical forces are involved in the fine-tuning of the locomotory organ during fin morphogenesis.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Cristal-growth dynamics of n-doped gaAs

1992 ◽  
Vol 50 (2) ◽  
pp. 1544-1545
Author(s):  
Pham V. Huong ◽  
Stéphanie Bouchet ◽  
Jean-Claude Launay
Keyword(s):  
Crystal Growth ◽  
Spatial Resolution ◽  
Epitaxial Layer ◽  
Outer Surface ◽  
Gaas Substrate ◽  
Structural Modification ◽  
Growth Dynamics ◽  
Argon Laser ◽  
High Anisotropy ◽  
Crystal Gaas

Microstructure of epitaxial layers of doped GaAs and its crystal growth dynamics on single crystal GaAs substrate were studied by Raman microspectroscopy with a Dilor OMARS instrument equipped with a 1024 photodiode multichannel detector and a ion-argon laser Spectra-Physics emitting at 514.5 nm.The spatial resolution of this technique, less than 1 μm2, allows the recording of Raman spectra at several spots in function of thickness, from the substrate to the outer deposit, including areas around the interface (Fig.l).The high anisotropy of the LO and TO Raman bands is indicative of the orientation of the epitaxial layer as well as of the structural modification in the deposit and in the substrate at the interface.With Sn doped, the epitaxial layer also presents plasmon in Raman scattering. This fact is already very well known, but we additionally observed that its frequency increases with the thickness of the deposit. For a sample with electron density 1020 cm-3, the plasmon L+ appears at 930 and 790 cm-1 near the outer surface.

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