92 research outputs found
Analysis of the applicability of optical fibers as sensors for the structural health monitoring of polymer composites: the relationship between attenuation and the deformation of the fiber
State Monitoring of Polymer Composites with Glass Optical Fibre and with Equipment Used in Telecommunication
T-RTM eljárással gyártott alkatrĂ©szek gyártási folyamatának kihĂvásai, kĂĽlönös tekintettel az erĹ‘sĂtĹ‘anyagok kezelĂ©sĂ©re
Analysis of the Light Transmission Ability of Reinforcing Glass Fibers Used in Polymer Composites
This goal of our research was to show that E-glass fiber bundles used for reinforcing composites can be enabled to transmit light in a common resin without any special preparation (without removing the sizing). The power of the transmitted light was measured and the attenuation coefficient, which characterizes the fiber bundle, was determined. Although the attenuation coefficient depends on temperature and the wavelength of the light, it is independent of the power of incident light, the quality of coupling, and the length of the specimen. The refractive index of commercially available transparent resins was measured and it was proved that a resin with a refractive index lower than that of the fiber can be used to make a composite whose fibers are capable of transmitting light. The effects of temperature, compression of the fibers, and the shape of fiber ends on the power of transmitted light were examined. The measurement of emitted light can provide information about the health of the fibers. This can be the basis of a simple health monitoring system in the case of general-purpose composite structures
Az ABCA1 membránfehérje funkciójának és fehérje-kölcsönhatásainak vizsgálata = Investigation of the function and protein interactions of the ABCA1 membrane protein
A kutatás cĂ©lja az ABCA1 membránfehĂ©rje működĂ©sĂ©nek Ă©s fehĂ©rje-kölcsönhatásainak jellemzĂ©se volt. Ăšj modellrendszereket alakĂtottunk ki Sf9 rovarsejt-bakulovĂrus Ă©s retrovirális expressziĂłs rendszerek segĂtsĂ©gĂ©vel, rĂ©szletesen vizsgáltuk a vad-tĂpusĂş Ă©s mutáns ABCA1 fehĂ©rjĂ©k sejten belĂĽli lokalizáciĂłját, működĂ©sĂ©t Ă©s PDZ fehĂ©rjĂ©kkel valĂł kölcsönhatását. BizonyĂtottuk, hogy az ABCA1 fehĂ©rje mind az ApoA1-fĂĽggĹ‘ koleszterin kiáramlás, mind a Ca2+-aktivált sejtfelszĂni foszfatidilszerin expozĂciĂł folyamatában fontos szerepet játszik. ElsĹ‘kĂ©nt mutattunk ki összefĂĽggĂ©st egy vĂ©rzĂ©kenysĂ©gi betegsĂ©g Ă©s az ABCA1 működĂ©se között. ElemeztĂĽk az ABCA1 mutáciĂłnak hatását a betegsĂ©gre jellemzĹ‘ hibás foszfatidilszerin expozĂciĂłban. Vizsgáltuk a lipidanyagcserĂ©re hatĂł vegyĂĽletek hatását az ABCA1-hez köthetĹ‘ funkciĂłkra, azonosĂtottunk kĂ©t Ăşj gátlĂł vegyĂĽletet. MegállapĂtottuk, hogy egy speciális PDZ fehĂ©rje a vizsgált ABC fehĂ©rjĂ©k közĂĽl egyedĂĽl az ABCA1 fehĂ©rjĂ©vel lĂ©p kölcsönhatásba, más ABC transzporterekhez kötĹ‘ egyĂ©b PDZ fehĂ©rjĂ©k nem kötĹ‘dtek az ABCA1-hez. Kimutattuk polarizált sejtekben az ABCA1, a b2-syntrophin Ă©s az utrophin bazolaterális ko-lokalizáciĂłját. A kidolgozott mĂ©rĂ©si mĂłdszereket más ABC transzporterek működĂ©sĂ©nek vizsgálatára is eredmĂ©nyesen alkalmaztuk. MegkezdtĂĽk a foszfolipid-transzportĂ©rt felelĹ‘s ABC fehĂ©rjĂ©k azonosĂtását trombocitákban. | The aims of this project were the functional characterization of the ABCA1 protein and identification of its potential interactions with intracellular proteins. We installed new assay systems to analyse the function, subcellular localization and protein interactions of the wild-type and mutant ABCA1 versions, by using two expression systems: the baculovirus-Sf9 insect cell system and retrovirus based expression system for mammalian cells. We proved that ABCA1 plays a key role both in cellular ApoAI-mediated cholesterol removal pathway, and in the exofacial translocation of phosphatidylserine. Our results provided the first link between a defect in a transbilayer phospholipid transport pathway, that of ABCA1, and the bleeding phenotype. We analysed the effects of various mutations of ABCA1 on the Ca2+-stimulated PS exposition. We screened the influence of potential inhibitors on the ABCA1-dependent processes and identified new inhibitors of the PS exposition. We demonstrated that among the examined ABC transporters only ABCA1 binds b2-syntrophin. A diverse group of PDZ proteins that interacts with other ABC proteins does not bind to ABCA1. We showed basolateral colocalization of ABCA1 protein with b2-syntrophin and utrophin. The assays for ABCA1 characterization were applied for studying other ABC proteins successfully. We started the identification of ABC proteins involved in phospholipid translocation in platelets
Polimer kompozitok állapotelemzése üveg fényvezető szállal és távközlési eszközökkel
A nagy mennyisĂ©gű felhasználásnak köszönhetĹ‘en a távközlĂ©si fĂ©nyvezetĹ‘ szálak Ă©s a hozzájuk kapcsolĂłdĂł berendezĂ©sek költsĂ©ghatĂ©konnyá Ă©s könnyen elĂ©rhetĹ‘vĂ© váltak. CĂ©lunk annak bemutatása, hogy a polimer kompozitba Ă©pĂtett, egymĂłdusĂş fĂ©nyvezetĹ‘ szál megváltozott csillapĂtásának mĂ©rĂ©sĂ©vel következtetni lehet a szerkezet kezdeti, terhelĂ©smentes állapotához kĂ©pest bekövetkezett nyĂşlására, mĂ©g a fĂ©nyvezetĹ‘ szál szakadása elĹ‘tt. BizonyĂtottuk továbbá, hogy a polimer kompozit szerkezetekben lĂ©trejövĹ‘ alakváltozások helye, helyei a távközlĂ©si hálĂłzatok száltoldásainak ellenĹ‘rzĂ©sĂ©re használt OTDR-műszerrel kimutathatĂłk
A novel mathematical model describing adaptive cellular drug metabolism and toxicity in the chemoimmune system
Cells cope with the threat of xenobiotic stress by activating a complex molecular network that recognizes and eliminates chemically diverse toxic compounds. This "chemoimmune system" consists of cellular Phase I and Phase II metabolic enzymes, Phase 0 and Phase III ATP Binding Cassette (ABC) membrane transporters, and nuclear receptors regulating these components. In order to provide a systems biology characterization of the chemoimmune network, we designed a reaction kinetic model based on differential equations describing Phase 0-III participants and regulatory elements, and characterized cellular fitness to evaluate toxicity. In spite of the simplifications, the model recapitulates changes associated with acquired drug resistance and allows toxicity predictions under variable protein expression and xenobiotic exposure conditions. Our simulations suggest that multidrug ABC transporters at Phase 0 significantly facilitate the defense function of successive network members by lowering intracellular drug concentrations. The model was extended with a novel toxicity framework which opened the possibility of performing in silico cytotoxicity assays. The alterations of the in silico cytotoxicity curves show good agreement with in vitro cell killing experiments. The behavior of the simplified kinetic model suggests that it can serve as a basis for more complex models to efficiently predict xenobiotic and drug metabolism for human medical applications
- …