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Wyszukujesz frazę "tissue scaffold" wg kryterium: Temat


Tytuł:
Migration channels produced by laser ablation for substrate endothelialization
Autorzy:
Major, R.
Maksymow, K.
Marczak, J.
Lackner, J.
Kot, M.
Major, B.
Tematy:
inorganic coatings
pulsed laser ablation
tissue scaffold
endothelial cells migration
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/201285.pdf  Link otwiera się w nowym oknie
Opis:
Seeding of cells on functional, biocompatible scaffolds is a crucial step in achievement the desired engineered tissue. In the present study, a pulsed laser modification onto inorganic substrate was made to promote endothelium cells migration and spread. Presented scaffolds were fabricated on carbon and titanium based coatings. Fabricated films provided very good mechanical properties together with a chemical stability preservation. The substrate modification consisted of grid-like template fabrication of micrometer size meshes. The microstructure analysis of laser traces revealed the grain size increase in the zone of laser beam interaction, which exerts an influence on a surface topography. Endothelium cells locomotion was observed within 10 day time period. As a result it was shown that the modified area enhanced cells adhesion with a preferred static behavior. The performed research work improved our understanding on the pulsed laser ablation process and template size influence on cells spatial arrangement. It constituted an important step towards fabrication of inorganic, biocompatible scaffolds for successful substrate endothelialization.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polylactide modification with β-TCP and lecithin on the properties of the material as a substrate for osteoblasts
Autorzy:
Olkowski, R.
Stefanek, A.
Kaszczewski, P.
Ciach, T.
Lewandowska-Szumieł, M.
Kalaszczyńska, I.
Tematy:
polylactide
lecithin
osteoblasts
scaffold
bone tissue engineering
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/285423.pdf  Link otwiera się w nowym oknie
Opis:
Polylactide (PLLA) containing β-TCP is biodegradable composite and an attractive biomaterial for bone tissue engineering, however, hydrophobicity of PLLA based composites is major limitation for their use as scaffolds for cell culture. In our study lecithin was used to improve hydrophilicity and cytocompatibility of PLLA/ β-TCP composite. Thin films of PLLA, PLLA/ β-TCP and PLLA/β-TCP/lecithin were manufactured by solvent-casting technique. Comparative analysis of all types of films was performed. Addition of β-TCP did not change hydrophilicity of PLLA. The hydrophilicity of PLLA/β-TCP/lecithin increased in comparison to PLLA and PLLA/β-TCP. Degradation of PLLA/β-TCP composite surpassed the degradation of PLLA while addition of lecithin diminished the degradation of composite. The cytocompatibility of composites were studied in 7 day long in vitro assay. Human bone derived cells were seeded on all tested surfaces. Cell viability was estimated by Live/Dead fluorescent staining and Alamar Blue test. Surprisingly, although lecithin addition improved hydrophilicity of the PLLA-based composite, adhesion and proliferation of human bone derived cells were markedly hampered on PLLA/β-TCP/lecithin in comparison to PLLA and PLLA/β-TCP. Despite positive effect we found of lecithin addition on hydrophilicity and stability of PLLA-based composite, its effect on cell attachment and proliferation is negative. Hence, incorporation of lecithin did not improve properties of PLLA/β-TCP/lecithin composite intended for bone tissue regeneration.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformation of bacterial cellulose into a scaffold-like material as a new hope for tissue engineering
Autorzy:
Kaźmierczak, Marta
Tematy:
Gluconacetobacter xylinum
bacterial cellulose
scaffold
tissue engineering
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1177784.pdf  Link otwiera się w nowym oknie
Opis:
Scaffolds are three-dimensional structures used in medicine, especially in tissue engineering, for the reconstruction of damaged tissue or organ. They should be constructed in a special way, to provide support for different cells’ vital functions. Bacterial cellulose produced by Gluconacetobacter xylinus has congruous features to natural occurring extracellular matrixes. Natural pores which occure in cellulose‘s structure have not adequate diameter to colonize them with viable cells. The authors conducted some experiments in order to enlarge channels in cellulose structure. Repeated frosting and defrosting of accurately prepared cellulose samples has created positive results but application of sterile mixture of vegetable oil during culture process gave expected results – diameter of the channels and chambers was big enough to colonize them with viable cells.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materiały dla inżynierii tkankowej
Materials for tissue engineering
Autorzy:
Grolik, M.
Fiejdasz, S.
Tematy:
inżynieria tkankowa
regeneracja tkanek
komórka
rusztowanie komórkowe
tissue engineering
tissue regeneration
cell
scaffold
Pokaż więcej
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Powiązania:
https://bibliotekanauki.pl/articles/99074.pdf  Link otwiera się w nowym oknie
Opis:
Niniejszy artykuł został poświęcony tematyce związanej z inżynierią tkankową. Dziedzina ta, pomimo tego, że jest stosunkowo młoda rozwija się dosyć prężnie. Łącząc w sobie zagadnienia z wielu dyscyplin naukowych (inżynierii materiałowej, chemii, biologii, medycyny) ma na celu regenerację uszkodzonych tkanek i narządów. Bardzo ważną rolę w całym procesie dogrywają materiały, które mają posłużyć jako mechaniczne wsparcie dla rosnących tkanek. Dobór i odpowiednia obróbka materiałów jest kluczowa dla powodzenia tej techniki.
This article is dedicated to the topic connected with tissue engineering. Despite the fact that this field is relatively young it is developing quite quickly. It combines the principles of many disciplines (material engineering, chemistry, biology, medicine) in order to regenerate damaged tissues and organs. Materials are very important in the whole process - they provide the mechanical support for growing tissues. The selection of materials and their fabrication plays the key role in this technique.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Three-Dimensional Printed Composite Scaffolds Prepared with Different Fabrication Methods
Autorzy:
Szlązak, K.
Jaroszewicz, J.
Ostrowska, B.
Jaroszewicz, T.
Nabiałek, M.
Szota, M.
Swieszkowski, W.
Tematy:
polycaprolactone
tricalcium phosphate
scaffold
rapid prototyping
tissue engineering
computed tomography
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/353028.pdf  Link otwiera się w nowym oknie
Opis:
An optimal method for composites preparation as an input to rapid prototyping fabrication of scaffolds with potential application in osteochondral tissue engineering is still needed. Scaffolds in tissue engineering applications play a role of constructs providing appropriate mechanical support with defined porosity to assist regeneration of tissue. The aim of the presented study was to analyze the influence of composite fabrication methods on scaffolds mechanical properties. The evaluation was performed on polycaprolactone (PCL) with 5 wt% beta-tricalcium phosphate (TCP) scaffolds fabricated using fused deposition modeling (FDM). Three different methods of PCL-TCP composite preparation: solution casting, particles milling, extrusion and injection were used to provide material for scaffold fabrication. The obtained scaffolds were investigated by means of scanning electron microscope, x-ray micro computed tomography, thermal gravimetric analysis and static material testing machine. All of the scaffolds had the same geometry (cylinder, 4×6 mm) and fiber orientation (0/60/120°). There were some differences in the TCP distribution and formation of the ceramic agglomerates in the scaffolds. They depended on fabrication method. The use of composites prepared by solution casting method resulted in scaffolds with the best combination of compressive strength (5.7±0.2 MPa) and porosity (48.5±2.7 %), both within the range of trabecular bone.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza i charakterystyka hydrożelowych nanokompozytów chitozan/laponit dla inżynierii tkanki kostnej
Synthesis and characterization of hydrogel chitosan/laponite nanocomposites for bone tissue engineering
Autorzy:
Pazdan, K.
Pielichowska, K.
Gryń, K.
Chłopek, J.
Tematy:
chitozan
Laponite®
rusztowanie
regeneracja tkanki kostnej
chitosan
scaffold
bone tissue regeneration
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/286171.pdf  Link otwiera się w nowym oknie
Opis:
Celem przeprowadzonych badań było uzyskanie nowego wielofunkcyjnego biomateriału do regeneracji tkanki kostnej, spełniającego wymagania stawiane przez nowe trendy w medycynie regeneracyjnej. Biorąc pod uwagę wymagania związane ze zgodnością biologiczną oraz minimalną szkodliwością implantu dla organizmu ludzkiego, z grupy dostępnych naturalnych i syntetycznych polimerów jako najbardziej obiecujący wybrany został chitozan. Chitozan jest coraz częściej używanym polimerem w zastosowaniach medycznych, takich jak: opatrunki, systemy dostarczania leku, system dostarczania genów, podłoża do regeneracji kości i tkanek miękkich, itp. Istotną zaletą chitozanu jest jego zdolność do tworzenia fazy hydrożelowej i ta właściwość jest wykorzystywana przez naukowców do uzyskiwania nowych biomateriałów. Obecnie hydrożele są używane w zastosowaniach sensorycznych wykorzystujących sygnały temperaturowe, pH, siły jonowej, jonowe czy przyłożonego zewnętrznego pola magnetycznego do wywołania oczekiwanej odpowiedzi. W niniejszej pracy został zastosowany syntetyczny nanokrzemian warstwowy pod nazwą handlową Laponite® XLS zamiast powszechnie stosowanych organicznych środków sieciujących często szkodliwych dla pacjenta. Uzyskane próbki zostały scharakteryzowane za pomocą różnicowej kalorymetrii skaningowej (DSC), spektroskopii w podczerwieni z transformacją Fouriera (FT-IR), dyfrakcji rentgenowskiej oraz testu nasiąkliwości. Do wstępnego określenia bioaktywności materiałów zastosowano test w warunkach in vitro zaproponowany przez Kokubo. Uzyskane dane poddane ocenie i szczegółowej analizie dały pozytywne i obiecujące wyniki.
The aim of the study was to obtain novel multifunctional biomaterials for bone tissue regeneration fulfilling the requirements imposed by new trends in regenerative medicine. Taking into account that implant has to be biocompatible and less harmful to humans, from a group of available natural and synthetic polymers chitosan was chosen as one of the most promising biomaterials. Chitosan is more and more commonly used in medicine for wound dressings, drug delivery systems, gene delivery systems, scaffolds for bone and soft tissue regeneration etc. Important advantage of chitosan is its ability to create hydrogel phases and this property is used by scientists to obtain novel biomaterials. Nowadays hydrogels are commonly used in sensing applications using temperature, pH, ions, ionic strength or external magnetic field mechanisms to trigger the desired response. Having regarded patient care, synthetic nanoclay (trade name Laponite® XLS) was applied instead of commonly used organic cross--linkers. Obtained specimens were characterized by differential scanning calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FT-IR), X-ray diffraction and water soaking test. The in vitro test proposed by Kokubo was performed to determine bioactivity of the materials. Obtained data were analyzed in detail and provided positive and promising information.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of composite filaments and 3D prints based on PLA modified with carbon materials with the potential applications in tissue engineering
Autorzy:
Hunger, M.
Podgórny, W.
Frączek-Szczypta, A.
Tematy:
3D printing
poly (lactic acid)
carbon materials
scaffold
tissue engineering
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/285818.pdf  Link otwiera się w nowym oknie
Opis:
This paper discusses the possibilities of obtaining polylactide-based composites and nanocomposites modified with carbon materials using the extrusion method, as well as the potential of their application in 3D printing technology. The aim of this research is to determine the impact of the presence of carbon additives on the properties of composites: mechanical, thermal and chemical. For this purpose, several research techniques were used such as scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), DSC/TG analysis, infrared Fourier-transform infrared spectroscopy (FTIR) and mechanical tests. It has been shown that it is possible to effectively produce composite materials based on PLA and carbon modifiers after optimization of the extrusion and printing process. Special attention should be paid to the quality of carbon phases homogenization in PLA matrix because the inappropriate dispersion may have a negative effect on the final properties of the composite, especially those modified with nanomaterials. Moreover, the reinforcing effect of carbon phases can be observed, and the quality of obtained filament with carbon fiber after recycling does not differ significantly from the quality of commercially available filaments. The obtained filament was successfully used to print three-dimensional scaffolds. Therefore, both the use of materials which are biodegradable and biocompatible with human tissue and the 3D printing method have the potential to be applied in tissue engineering.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the microstructure and mechanical properties of porous gelatin scaffolds
Autorzy:
Morawska-Chochół, Anna
Tematy:
scaffold
microstructure
tissue engineering
gelatin
freeze-drying
mikrostruktura
inżynieria tkankowa
żelatyna
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:
https://bibliotekanauki.pl/articles/2058382.pdf  Link otwiera się w nowym oknie
Opis:
Gelatin scaffolds are in the interest of tissue engineering and drug release. The scaffold porosity and microarchitecture are of great importance in proper tissue regeneration. In this work, the freeze-drying method was used to produce the scaffolds. The effect of concentration of the initial gelatin solution and pre- -freezing temperature on the scaffold’s microstructure and microarchitecture (porosity, pores size, shape, and distribution) was evaluated. The mechanical tests of samples were performed. Moreover, the influence of the gentamicin sulphate addition on the gelatin scaffolds microstructure and mechanical properties was also studied. The linear relationship of porosity to the concentration of the initial solution was observed. Therefore, it is possible to obtain a scaffold with a planned porosity. Pores were interconnected with an aspect ratio between 1.5-1.8. For porosity 74 ± 9% the average pore size was 0.7 ± 0.6 mm, with most pores in the range 0.2-0.4 mm. For the samples with porosity 57 ± 14%, the average pore size was 0.2 ± 0.2 mm, with most pores in the range 0.05-0.2 mm. The process of pre-freezing the solution in liquid nitrogen caused the highest porosity of the sample, the smaller pores size and the lower pores size distribution in comparison to the sample pre-frozen in -20°C. The mechanical parameters for all the samples are sufficient for filling bone defects. The addition of a drug to gelatin caused only slight changes in the pore architecture. This material could be applied as a scaffold in the bone loss correlated to bacterial infection.
Dostawca treści:
Biblioteka Nauki
Artykuł

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