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A COMPARISON OF THE CENTRIFUGAL FORCE SPINNING AND ELECTROSPINNING OF COLLAGEN UNDER DIFFERENT CONDITIONS
Hlavatá, J.; Suchý, Tomáš; Šupová, Monika; Pokorný, M.; Košťáková, E.
2017 - anglický
Collagen makes up one of the most important parts of the extracellular matrix and connective tissue. Collagen type I accounts for up to 90% of the collagen found in the body and it can be isolated and purified in large quantities and processed into a variety of forms. With respect to the process of the treatment of collagen into the nano-fibrous and submicron-fibrous forms, severe conditions leading to the denaturation of the collagen and thus the gelatin content should be avoided. Centrifugal force spinning and electrospinning processes appear to present promising methods for the spinning of collagen solutions. This paper deals with a comparison of the various methods applied in the processing of collagen, i.e. principally needle and needleless centrifugal spinning technology and electrospinning technology. In addition, the effect of process parameters and collagen solution conditions on the final form of the material was analyzed. Spun layers were prepared based on collagen type I isolated from calf skin. Nano-structured layers were prepared employing the spinning of 4-16 wt% collagen solutions in phosphate buffer saline and ethanol. The layers thus prepared were characterized by means of scanning electron microscopy and Fourier transform infrared spectroscopy.
Klíčová slova:
collagen; electrospinning; centrifugal force spinning; triple-helix
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
A COMPARISON OF THE CENTRIFUGAL FORCE SPINNING AND ELECTROSPINNING OF COLLAGEN UNDER DIFFERENT CONDITIONS
Collagen makes up one of the most important parts of the extracellular matrix and connective tissue. Collagen type I accounts for up to 90% of the collagen found in the body and it can be isolated and ...
Hydrogen charging of fuel cladding methodology
Krejčí, J.; Kabátová, J.; Kočí, J.; Weishauptová, Zuzana; Vrtílková, V.
2016 - anglický
Hydrogen content is a very important parameter for mechanical properties of fuel cladding. The methodology of developed hydrogen charging is described.
Klíčová slova:
fuel cladding; hydridation
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Hydrogen charging of fuel cladding methodology
Hydrogen content is a very important parameter for mechanical properties of fuel cladding. The methodology of developed hydrogen charging is described.
A brief introduction to the geology of the Moldanubian batholith
Verner, K.; René, Miloš; Žák, J.; Janoušek, V.
2015 - anglický
Emplacement processes and tectonic setting of the Moldanubian batholith. The batholith consists of multiple intrusive units (plutons, stocks and dykes), predominantly composed of granitic to granodioritic rocks with either S- or transitional I/S-type.
Klíčová slova:
granite; petrology; geochemistry; Bohemian Massif
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
A brief introduction to the geology of the Moldanubian batholith
Emplacement processes and tectonic setting of the Moldanubian batholith. The batholith consists of multiple intrusive units (plutons, stocks and dykes), predominantly composed of granitic to ...
Origin of “rock cities”, pillars and cleft-conduits in kaolinite-bonded sandstone: New insight from study in sandstone quarry where landforms recently evolve
Bruthans, J.; Soukup, J.; Schweigstillová, Jana; Vaculíková, J.; Smutek, D.; Mayo, A. L.; Falteisek, L.
2013 - anglický
Based on measurements of relative erodibility, ambient and water-saturated tensile strength at natural and quarry exposures three distinct kinds of surfaces were distinguished (erodible sandstone, sub-vertical fracture surfaces and case hardened surfaces). Erosion proceeded along highly fractured zones.
Klíčová slova:
case hardening erosion; fluidization; overland flow; piping; sandstone landforms
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Origin of “rock cities”, pillars and cleft-conduits in kaolinite-bonded sandstone: New insight from study in sandstone quarry where landforms recently evolve
Based on measurements of relative erodibility, ambient and water-saturated tensile strength at natural and quarry exposures three distinct kinds of surfaces were distinguished (erodible sandstone, ...
The Influence of Steam Sterilization Processes on the Micro- and Macromechanical Properties of Polyamide Fiber-Reinforced PDMS Composites for Medical Device Applications
Sochor, M.; Balík, Karel; Sedláček, R.; Suchý, Tomáš; Sucharda, Zbyněk; Šepitka, J.; Lukeš, J.
2012 - anglický
The effect of multiple steam sterilization processes on the structural integrity of the polymer matrix composite polydimethylsiloxane (PDMS) reinforced with polyamide fibers (Aramid) is investigated by 3- and 4-point bending tests and by nanoindentation.
Klíčová slova:
composite material; sterilization; nanoindentation
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
The Influence of Steam Sterilization Processes on the Micro- and Macromechanical Properties of Polyamide Fiber-Reinforced PDMS Composites for Medical Device Applications
The effect of multiple steam sterilization processes on the structural integrity of the polymer matrix composite polydimethylsiloxane (PDMS) reinforced with polyamide fibers (Aramid) is investigated ...
Sterilization Decomposition Evaluation of Radiolucent Composite Materials for Use in Medicine
Sochor, M.; Balík, Karel; Suchý, Tomáš; Sedláček, R.; Sucharda, Zbyněk; Beneš, J.; Prokop, J.
2011 - anglický
This study evaluates the resistance against multiple sterilization processes of radiolucent composite materials for use in medicine as an intraoperative imaging device material. The composite materials under investigation here are composed of carbon fibers, polyphenylene sulfide and polyetheretherketone matrix. The influence of multiple sterilization processes on changes in their mechanical and structural properties are determined. The radiolucency of the proposed composites is verified.
Klíčová slova:
composite material; sterilization decomposition; radiolucency
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Sterilization Decomposition Evaluation of Radiolucent Composite Materials for Use in Medicine
This study evaluates the resistance against multiple sterilization processes of radiolucent composite materials for use in medicine as an intraoperative imaging device material. The composite ...
Pyrolysis of coal/waste plastic mixtures in cokemaking
Melegy, A.; Sýkorová, Ivana; Kříž, Vlastimil; Havelcová, Martina
2011 - anglický
In the recycling process of waste plastic using coke oven, sub-bituminous coal and added 5 vol. % of plastics are carbonized and changed into coke of optimal properties, tar and gas .
Klíčová slova:
Maghara subbituminous coal; pyrolysis; coal/plastic waste blend
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Pyrolysis of coal/waste plastic mixtures in cokemaking
In the recycling process of waste plastic using coke oven, sub-bituminous coal and added 5 vol. % of plastics are carbonized and changed into coke of optimal properties, tar and gas .
Application of a rotary kiln for the treatment of carbonaceous materials of the selective waste polymer and biomass type
Kříž, Vlastimil; Bičáková, Olga; Náhunková, Jana
2011 - anglický
In the rotary kiln, samples of polypropylene and sawdust in model mixtures with bituminous-coal coke at a temperature of 900°C were pyrolyzed. The composition and features of the pyrolytic gas and solid product were observed.
Klíčová slova:
rotary kiln; pyrolysis; biomass
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Application of a rotary kiln for the treatment of carbonaceous materials of the selective waste polymer and biomass type
In the rotary kiln, samples of polypropylene and sawdust in model mixtures with bituminous-coal coke at a temperature of 900°C were pyrolyzed. The composition and features of the pyrolytic gas and ...
Mechanical properties of geopolymer mortars in relation to their structure and amount of gel-forming components
Steinerová, Michaela
2011 - anglický
Compressive/flexural strengths, Young’s modulus and frost resistance of metakaolinite geopolymer composites from standard and waste material. Dependences on porous structure controlled by amount of filler and gel-forming precursors, consumed by bonds on the aggregate surface.
Klíčová slova:
metakaolinite; geopolymer composite; mechanical properties
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Mechanical properties of geopolymer mortars in relation to their structure and amount of gel-forming components
Compressive/flexural strengths, Young’s modulus and frost resistance of metakaolinite geopolymer composites from standard and waste material. Dependences on porous structure controlled by amount of ...
Microporous inorganic polymers based on metakaolinite and their open porosity structure of a size of 10-20 nm in diameter
Steinerová, Michaela
2011 - anglický
Geopolymer monomodal pore size distribution of 15 nm in diameter can change within 10-120 nm according to Si/Al ratio and water content in the space between clusters of condensed precursor nanoparticles. Results provided by mercury porosimetry, SEM and AFM.
Klíčová slova:
inorganic polymer matrix; Si/Al ratio systems; condensation-reactions
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Microporous inorganic polymers based on metakaolinite and their open porosity structure of a size of 10-20 nm in diameter
Geopolymer monomodal pore size distribution of 15 nm in diameter can change within 10-120 nm according to Si/Al ratio and water content in the space between clusters of condensed precursor ...
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