Relevant bibliographies by topics / Fibring

Academic literature on the topic 'Fibring'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Fibring"

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Zanardo, Alberto, Amilcar Sernadas, and Cristina Sernadas. "Fibring: completeness preservation." Journal of Symbolic Logic 66, no. 1 (March 2001): 414–39. http://dx.doi.org/10.2307/2694931.

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AbstractA completeness theorem is established for logics with congruence endowed with general semantics (in the style of general frames). As a corollary, completeness is shown to be preserved by fibring logics with congruence provided that congruence is retained in the resulting logic. The class of logics with equivalence is shown to be closed under fibring and to be included in the class of logics with congruence. Thus, completeness is shown to be preserved by fibring logics with equivalence and general semantics. An example is provided showing that completeness is not always preserved by fibring ligics endowed with standard (non general) semantics. A categorial characterization of fibring is provided using coproducts and cocartesian liftings.
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Gabbay, Dov M. "Fibring Argumentation Frames." Studia Logica 93, no. 2-3 (November 17, 2009): 231–95. http://dx.doi.org/10.1007/s11225-009-9217-y.

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Sernadas, Cristina, João Rasga, and Walter A. Carnielli. "Modulated fibring and the collapsing problem." Journal of Symbolic Logic 67, no. 4 (December 2002): 1541–69. http://dx.doi.org/10.2178/jsl/1190150298.

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AbstractFibring is recognized as one of the main mechanisms in combining logics, with great significance in the theory and applications of mathematical logic. However, an open challenge to fibring is posed by the collapsing problem: even when no symbols are shared, certain combinations of logics simply collapse to one of them, indicating that fibring imposes unwanted interconnections between the given logics. Modulated fibring allows a finer control of the combination, solving the collapsing problem both at the semantic and deductive levels. Main properties like soundness and completeness are shown to be preserved, comparison with fibring is discussed, and some important classes of examples are analyzed with respect to the collapsing problem.
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Rasga, J. "Fibring Labelled Deduction Systems." Journal of Logic and Computation 12, no. 3 (June 1, 2002): 443–73. http://dx.doi.org/10.1093/logcom/12.3.443.

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Fernandez, V. L., and M. E. Coniglio. "Fibring in the Leibniz Hierarchy." Logic Journal of IGPL 15, no. 5-6 (September 26, 2007): 475–501. http://dx.doi.org/10.1093/jigpal/jzm036.

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Coniglio, M. E. "Fibring Logics with Topos Semantics." Journal of Logic and Computation 13, no. 4 (August 1, 2003): 595–624. http://dx.doi.org/10.1093/logcom/13.4.595.

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Krawczyk, Krzysztof Aleksander. "Fibring Epistemic and Temporal Logics." Logic and Logical Philosophy 29, no. 1 (March 5, 2019): 195. http://dx.doi.org/10.12775/llp.2019.008.

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Carnielli, W., J. Rasga, and C. Sernadas. "Preservation of Interpolation Features by Fibring." Journal of Logic and Computation 18, no. 1 (September 4, 2007): 123–51. http://dx.doi.org/10.1093/logcom/exm061.

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Sernadas, A., C. Sernadas, J. Rasga, and M. Coniglio. "On Graph-theoretic Fibring of Logics." Journal of Logic and Computation 19, no. 6 (July 5, 2009): 1321–57. http://dx.doi.org/10.1093/logcom/exp024.

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Rasga, J., A. Sernadas, and C. Sernadas. "Fibring as Biporting Subsumes Asymmetric Combinations." Studia Logica 102, no. 5 (November 17, 2013): 1041–74. http://dx.doi.org/10.1007/s11225-013-9524-1.

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Dissertations / Theses on the topic "Fibring"

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Nair, Vineet. "On Extending BDI Logics." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365892.

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In this thesis we extend BDI logics, which are normal multimodal logics with an arbitrary set of normal modal operators, from three different perspectives. Firstly, based on some recent developments in modal logic, we examine BDI logics from a combining logic perspective and apply combination techniques like fibring/dovetailing for explaining them. The second perspective is to extend the underlying logics so as to include action constructs in an explicit way based on some recent action-related theories. The third perspective is to adopt a non-monotonic logic like defeasible logic to reason about intentions in BDI. As such, the research captured in this thesis is theoretical in nature and situated at the crossroads of various disciplines relevant to Artificial Intelligence (AI). More specifically this thesis makes the following contributions: 1. Combining BDI Logics through fibring/dovetailing: BDI systems modeling rational agents have a combined system of logics of belief, time and intention which in turn are basically combinations of well understood modal logics. The idea behind combining logics is to develop general techniques that allow to produce combinations of existing and well understood logics. To this end we adopt Gabbay's fibring/dovetailing technique to provide a general framework for the combinations of BDI logics. We show that the existing BDI framework is a dovetailed system. Further we give conditions on the fibring function to accommodate interaction axioms of the type G [superscript k,l,m,n] ([diamond][superscript k] [superscript l] [phi] [implies] [superscript m] [diamond][superscript n] [phi]) based on Catach's multimodal semantics. This is a major result when compared with other combining techniques like fusion which fails to accommodate axioms of the above type. 2. Extending the BDI framework to accommodate Composite Actions: Taking motivation from a recent work on BDI theory, we incorporate the notion of composite actions, [pi]-1; [pi]-2 (interpreted as [pi]-1 followed by [pi]-2), to the existing BDI framework. To this end we introduce two new constructs Result and Opportunity which helps in reasoning about the actual execution of such actions. We give a set of axioms that can accommodate the new constructs and analyse the set of commitment axioms as given in the original work in the background of the new framework. 3. Intention reasoning as Defeasible reasoning: We argue for a non-monotonic logic of intention in BDI as opposed to the usual normal modal logic one. Our argument is based on Bratman's policy-based intention. We show that policy-based intention has a defeasible/non-monotonic nature and hence the traditional normal modal logic approach to reason about such intentions fails. We give a formalisation of policy-based intention in the background of defeasible logic. The problem of logical omniscience which usually accompanies normal modal logics is avoided to a great extend through such an approach.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Information Technology
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Nair, Vineet, and n/a. "On Extending BDI Logics." Griffith University. School of Information Technology, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030929.095254.

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In this thesis we extend BDI logics, which are normal multimodal logics with an arbitrary set of normal modal operators, from three different perspectives. Firstly, based on some recent developments in modal logic, we examine BDI logics from a combining logic perspective and apply combination techniques like fibring/dovetailing for explaining them. The second perspective is to extend the underlying logics so as to include action constructs in an explicit way based on some recent action-related theories. The third perspective is to adopt a non-monotonic logic like defeasible logic to reason about intentions in BDI. As such, the research captured in this thesis is theoretical in nature and situated at the crossroads of various disciplines relevant to Artificial Intelligence (AI). More specifically this thesis makes the following contributions: 1. Combining BDI Logics through fibring/dovetailing: BDI systems modeling rational agents have a combined system of logics of belief, time and intention which in turn are basically combinations of well understood modal logics. The idea behind combining logics is to develop general techniques that allow to produce combinations of existing and well understood logics. To this end we adopt Gabbay's fibring/dovetailing technique to provide a general framework for the combinations of BDI logics. We show that the existing BDI framework is a dovetailed system. Further we give conditions on the fibring function to accommodate interaction axioms of the type G [superscript k,l,m,n] ([diamond][superscript k] [superscript l] [phi] [implies] [superscript m] [diamond][superscript n] [phi]) based on Catach's multimodal semantics. This is a major result when compared with other combining techniques like fusion which fails to accommodate axioms of the above type. 2. Extending the BDI framework to accommodate Composite Actions: Taking motivation from a recent work on BDI theory, we incorporate the notion of composite actions, [pi]-1; [pi]-2 (interpreted as [pi]-1 followed by [pi]-2), to the existing BDI framework. To this end we introduce two new constructs Result and Opportunity which helps in reasoning about the actual execution of such actions. We give a set of axioms that can accommodate the new constructs and analyse the set of commitment axioms as given in the original work in the background of the new framework. 3. Intention reasoning as Defeasible reasoning: We argue for a non-monotonic logic of intention in BDI as opposed to the usual normal modal logic one. Our argument is based on Bratman's policy-based intention. We show that policy-based intention has a defeasible/non-monotonic nature and hence the traditional normal modal logic approach to reason about such intentions fails. We give a formalisation of policy-based intention in the background of defeasible logic. The problem of logical omniscience which usually accompanies normal modal logics is avoided to a great extend through such an approach.
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Pinto, Ana Carolina Basso Engler. "Efeitos da fibrina rica em plaquetas e leucócitos (L-PRF) associada ou não a enxerto ósseo bovino na cicatrização de defeitos ósseos em ratas com osteoporose induzida por ovariectomia." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/58/58138/tde-29082017-164640/.

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Tem sido proposto que a Fibrina Rica em Plaquetas e Leucócitos (L-PRF) pode estimular a neoformação óssea e melhorar a incorporação de enxertos ósseos. Este estudo avaliou a cicatrização de defeitos de tamanho crítico (DTCs) criados em calvária de ratas com osteoporose induzida por ovariectomia e tratados com L-PRF associada ou não a enxerto ósseo bovino (XENO). 32 ratas foram divididas em 4 grupos (n=8): C, PRF, XENO e PRF-XENO. Todos os animais foram submetidos a um procedimento de ovariectomia bilateral no início do estudo. Após 3 meses, DTCs de 5 mm de diâmetro foram criados na calvária dos animais. No grupo C, o defeito foi preenchido apenas com coágulo sanguíneo. Nos grupos PRF e XENO, os defeitos foram preenchido com 0,02 mL de L-PRF e 0,02 mL de XENO, respectivamente. No grupo PRF-XENO o defeito foi preenchido com uma mistura de 0,02 mL de PRF e 0,02 mL de XENO. Todos os animais foram submetidos à eutanásia aos 30 dias pós-operatórios. Foram realizadas análises histomorfométrica, microtomográfica e imunohistoquímica. Os dados obtidos foram estatisticamente analisados (ANOVA, Tukey, p < 0,05). O Grupo PRF-XENO apresentou maior quantidade de osso neoformado (ON) quando comparado ao Grupo XENO, bem como maiores expressões de Fator de Crescimento Endotelial Vascular (VEGF), Osteocalcina (OCN) e Proteína Morfogenética Óssea (BMP)-2/4 (p < 0,05). O Grupo PRF apresentou maior quantidade de ON e maiores expressões de VEGF, OCN, BMP-2/4 e Fator de transcrição relacionado a Runt 2 (RUNX-2) quando comparado ao Grupo C (p < 0,05). Conclui-se que a L-PRF pode favorecer a neoformação óssea de DTCs e potencializar a cicatrização de XENO em ratas com osteoporose induzida por ovariectomia.
It has been proposed that Platelet Rich Fibrin and Leukocyte (L-PRF) can stimulate bone neoformation and improve bone graft incorporation. This study evaluated the healing of critical caliber defects (CSDs) created in the calvaria of rats with osteoporosis induced by ovariectomy and treated with L-PRF associated or not with bovine bone graft (XENO). 32 rats were divided into 4 groups (n = 8): C, PRF, XENO and PRF-XENO. All animals underwent a bilateral ovariectomy procedure at the start of the study. After 3 months, CDSs of 5 mm diameter were created in calvaria of the animals. In group C, the defect was filled only with blood clot. In the PRF and XENO groups, the defects were filled with 0.02 mL of L-PRF and 0.02 mL of XENO, respectively. In the PRF-XENO group the defect was filled with a mixture of 0.02 mL of PRF and 0.02 mL of XENO. All animals were submitted to euthanasia at 30 postoperative days. Histomorphometric, microtomographic and immunohistochemical analyzes were performed. The data were statistically analyzed (ANOVA, Tukey, p < 0.05). The PRF-XENO group presented higher amount of neoformed bone (NB) when compared to the XENO group, as well as higher expression of Vascular Endothelial Growth Factor (VEGF), Osteocalcin (OCN) and Bone Morphogenetic Protein (BMP -2/4 (p < 0.05). The PRF group presented higher amounts of NB and higher expression of VEGF, OCN, BMP-2/4 and Runt-related transcription factor 2 (RUNX-2) when compared to the group C (p <0.05). It can be concluded that L-PRF can improve bone neoformation in CSDs and potentiates the healing of XENO in rats with osteoporosis induced by ovariectomy.
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Garcia, gonzalez Xabel. "Influence de la nature du fibrinogène sur la structure et la mécanique du caillot de fibrine." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI076/document.

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La formation du caillot de fibrine, processus clé de la coagulation sanguine, implique la polymérisation des monomères de fibrine en un réseau de fibres. Ce réseau contrôle les propriétés mécaniques du caillot et constitue le squelette sur lequel se base la cicatrisation. Si l’influence des conditions de réaction (pH, concentration, …) est bien connue, le rôle de la composition du fibrinogène sur la structure de la fibrine est inexploré. Cet aspect pourrait être important pour les pathologies cardiovasculaires qui présentent toutes une structure de fibrine anormale.Nous avons étudié la relation entre la composition de plusieurs fibrinogènes et les propriétés structurelles nano- et micro-métriques ainsi que la mécanique des caillots de fibrine. La composition en protéines co-purifiées de ces fibrinogènes a peu d’influence, alors que le profil de polydispersité contrôle la structure multi-échelle de la fibrine. Des mesures de diffusion des rayons x, de spectrophotométrie multi-longueur d’ondes et de microscopie confocale ont mis en évidence que les fibres provenant des fibrinogènes monodisperses sont quasi-cristallines, droites et rigides. Les fibres provenant de fibrinogènes polydisperses sont, elles, beaucoup moins organisées, courbées, avec un module de rigidité faible. Enfin, les propriétés mécaniques de la fibrine ont montré que la réponse des caillots aux déformations, aussi que les scenarios de rupture, sont directement liés à sa structure et donc significativement dépendants du profil de polydispersité des fibrinogènes. Ces résultats ouvrent de nouvelles perspectives dans plusieurs domaines, que ce soit pour l’utilisation optimale des fibrinogènes pour les dysfibrinogénémies et hémorragies, mais également pour la reconstruction tissulaire, ainsi que la compréhension du lien entre la structure anormale des caillots et les maladies cardiovasculaires
Fibrin clot formation is one of the major processes leading to blood clotting. It involves the polymerization of fibrin monomers into a network of fibrin fibres. This network controls the mechanical properties of the clot and serves as a skeleton for wound healing. Environmental factors (pH, concentration, …) have been proved to influence polymerization, however the role of fibrinogen composition on the structure of fibrin remains unexplored. This aspect might be important for the case of cardiovascular pathologies, which present abnormal fibrin structures.We have determined the relation between different sources of fibrinogen with the nano- and micro-metric structural and mechanical properties of fibrin clots. The composition in co-purified proteins of the fibrinogens has no significant importance, however the polydispersity profile controls the multiscale properties of fibrin. Indeed, x-ray scattering, multi-wavelength spectrophotometry and confocal microscopy measurements have proved that fibres from monodisperse fibrinogens are quasi-crystalline, straight and rigid. Fibres from polydisperse fibrinogens are less organised, curbed and less rigid. Finally, the mechanical properties of fibrin showed that the response of clots to deformation, as well as the scenarios of rupture are closely related to the structure, and consequently related to the profiles of polydispersity. This opens outstanding perspectives in many fields such the optimisation of fibrinogen’s use on dysfibrinogenemias or haemorrhages, tissue regeneration or the understanding between the abnormal structure of clots and cardiovascular diseases
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Padovan, Luís Eduardo Marques. "Implante de adesivo fibrínico (Tissucol) em alvéolos dentais de ratos tratados com varfarina sódica após irrigação com ácido épisilon-aminocapróico (EACA) : análise histológica /." Araçatuba, 2002. http://hdl.handle.net/11449/101073.

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Orientador: Tetuo Okamoto
Resumo: Este estudo avaluoi-se o proceso de reparo de feridas de extração dental após irrigação com solução a 5% de ácido epsilon-amino-capróico (EACA) e implante de adesivo fibrínico (Tissucol). Foram utilizados 60 ratos (Wistar), machos, com peso entre 250 gramas e 300 gramas e divididos em 03 grupos com 20 animais cada, onde foram realizados os seguintes procedimentos: No grupo 1 foi administrado 0,1 ml/100mg de peso corporal de solução salina a 0,9%, iniciando-se 06 dias antes da exodontia, administração diária de 0,03ml de varfarina sódica sendo mantida durante todo o experimento. Após a exodontia do incisivo superior direito, seus alvêolos foram preenchido com adesivo fibrinico, No grupo III, os animais desse grupo receberam os mesmos procedimentos dos animais do grupo IIe, após a exodontia, tiveram seus alvêolos irrigados com 5ml de solução a 5% de ácido epsilon-amino-capróico e também preenchidos com adesivos fibrinico (Tissucol)...(Resumo completo, clicar acesso eletrônico abaixo)
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Wang, Kun. "Development of new fibrin-based biomaterials." Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS430.pdf.

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La fibrine est largement utilisée en clinique mais les hydrogels formés à partir de cette protéine souffrent généralement d’une faible tenue mécanique et d’une biodégradation très rapide. Pour palier ces limites, nous avons développé trois stratégies. La première consiste à former des matériaux hybrides en ajoutant différentes sources de silice. Une étude en conditions diluées a montré que certains silanes pouvaient favoriser la fibrillogénèse et conduire à une stabilisation des gels. A plus forte concentration de silane ou en présence de silice condensée, l’auto-assemblage de la fibrine est perturbé. La deuxième approche implique l’ajout de nanocristaux de cellulose. Des études en conditions diluées ont mis en évidence l’adsorption du fibrinogène sur les nanocristaux, qui facilite leur alignement. En conditions plus concentrées, un renfort mécanique notable a pu être constaté. De plus un ralentissement de la cinétique de gélification a conduit à de nouvelles formulations injectables. La troisième approche repose sur l’association avec du collagène de type I. En utilisant un procédé de gélification du fibrinogène en conditions acides, il a été possible d’obtenir des gels mixtes mais les propriétés rhéologiques ont été peu modifiées. Pour les trois stratégies adoptées, les matériaux ont été évalués pour leur capacité à promouvoir la prolifération de cellules myoblastes et leur différentiation. Des résultats intéressants ont été obtenus en présence de nanocelullose. Ce travail a donc permis d’élucider les interactions de la fibrine avec différents partenaires inorganiques ou bio-organiques et ouvre de nouvelles perspectives pour son application dans le domaine biomédical
Fibrin is widely used in clinic, but hydrogels formed by this protein generally suffer from poor mechanical property and very rapid biodegradation. To overcome these limitations, we have developed three strategies. The first was to form hybrid materials by adding different sources of silanes. The certain silanes at low concentration could promote fibrillogenesis and lead to stabilization of the gels. At a higher concentration of silane or in the presence of condensed silica, the self-assembly of fibrin is disturbed. The second approach involved the addition of cellulose nanocrystals. Studies under dilute condition shown the adsorption of fibrinogen to the nanocrystals, which facilitates their alignment. Composite hydrogels from high concentrated fibrinogen and nanocrystals showed a notable mechanical reinforcement. In addition, a slowing down of the gelation kinetics have led to new injectable formulations. The third approach was to form the interpenetrate network with type I collagen. Through the process of gelation of fibrinogen under acidic conditions, it was possible to obtain mixed gels but the rheological properties of which were little modified. For the three strategies adopted, the materials have been shown to have the ability to promote proliferation and differentiation of myoblast cells. Interesting results have been obtained in the presence of cellulose nanocrystals. This work has therefore made it possible to elucidate the interactions of fibrin with various inorganic or bio-organic fillers and opens up new perspectives for its application in the biomedical field
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Rezende, Antonio Roberto da Rosa. "Comparação entre uso de cola biológica de fibrina e drenagem de aspiração pós-operatória na prevenção de hematoma e seroma em ritidoplastia : um estudo controlado, randomizado e duplo cego." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/179691.

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Este trabalho tem por objetivo comparar a eficácia da cola biológica de fibrina e da drenagem de aspiração pós-operatória na prevenção de complicações cirúrgicas como hematoma e seroma após a realização de ritidoplastia pela equipe da Clínica Rezende no Hospital Moinhos de Vento, na cidade de Porto Alegre/RS. Realizou-se estudo prospectivo, controlado, randomizado e duplo cego. Foram analisadas 72 pacientes, divididas em dois grupos de 36, sendo que no grupo dreno utilizou-se drenagem de aspiração e no grupo cola utilizou-se cola de fibrina. Quarenta e oito horas após a realização dos procedimentos, todas as pacientes foram submetidas a aferição ecográfica da lâmina de exsudato presente sob os retalhos cutâneos da face. O volume total médio foi de 3,21 mL no grupo dreno e 1,02 mL no grupo cola, com magnitude de efeito de 68,1% e intervalo de confiança de 55,3 a 77,2 e p <0,001. Com esses resultados, comprovou-se que a cola apresenta eficácia significativa, demonstrando que sua utilização é 68,1 % mais efetiva que a drenagem de aspiração na prevenção de hematomas ou seromas em ritidoplastia.
This study aimed to compare the efficacy of fibrin glue and suction drainage in preventing postoperative complications such as hematoma and seroma following rhytidoplasties conducted by the staff of Clínica Rezende at Hospital Moinhos de Vento in Porto Alegre, Brazil. A prospective, controlled, randomized, double-blind trial was conducted. The 72 patients assessed in the study were divided into two groups of 36 each, one treated with suction drainage and other with fibrin glue. Forty-eight hours after the procedures, all patients underwent ultrasound evaluation of the volume of exudate under facial skin flaps. The average volume of exudate was 3.21 mL in the drainage group and 1.02 mL in the fibrin glue group, with a size effect of 68.1%, 95% confidence interval of 55.3 to 77.2, and p <0.001. The results of this investigation significant favor the use of fibrin glue, showing that was 68.1 % more effective than suction drainage in preventing hematoma or seroma following rhytidoplasty.
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Barcelos, Fabricio Chies. "Histologia comparativa das alterações medulares provocadas pela reparação da dura-máter em ratos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-04082010-172034/.

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A durotomia acidental, na cirurgia da coluna lombar, é uma das mais comuns complicações, com uma prevalência de 1 a 17%. As fraturas da coluna também podem apresentar-se com lesão dural, chegando a 19% nas fraturas tipo explosão da coluna torácica ou lombar com lesão associada da lâmina vertebral. Procurou-se avaliar as alterações medulares que ocorreram apos a reparação de lesão dural com pontos do tipo simples, com cola de fibrina e com colágeno bovino, através de análise histológica. Manteve-se um grupo controle, sem reparação. Utilizaram-se 70 ratos da raça Wistar, sendo que 34 foram excluídos por problemas anestésicos ou intra-operatórios. Mantiveram-se nove ratos por grupo. Abordaram-se os segmentos vertebrais T8 e T9, para efetuar a lesão, que foi reparada pelos três diferentes métodos avaliados. Os animais permaneceram confinados por 24 dias, sendo submetidos à eutanásia com a coleta de material para análise histológica. O Serviço de Patologia avaliou e graduou (ausente, discreto, moderado e acentuado) os casos quanto à hiperemia, degeneração medular, necrose e infiltrado celular. De forma geral, as técnicas de reparo apresentaram resultados com maior grau de alteração, principalmente em relação ao infiltrado celular, onde todas as técnicas mostraram resultados bem piores. A sutura apresentou graus mais severos de necrose, hiperemia e infiltrado celular. A membrana de colágeno apresentou resultados com graus mais elevados de alteração em relação à hiperemia, à degeneração da substância nervosa e ao infiltrado celular. A reparação com cola de fibrina apresentou piora em relação ao grau de necrose e de infiltrado celular. A presença de alterações medulares em todos os grupos, até mesmo no grupo controle, levou a cogitar algumas possíveis causas para os resultados: as alterações medulares seriam geradas pela técnica cirúrgica ocorrendo uma lesão iatrogênica medular, mas sem repercussão clinica; os materiais estudados poderiam causar alterações no tecido neural; o simples contato do tecido neural com o meio extra-dural, após a lesão, seria a causa das alterações levando à mesma cascata de alterações que ocorre nas lesões medulares traumáticas. Apesar de todos os grupos apresentarem alterações medulares, ficou evidente que as de maior intensidade ocorreram nos grupos que utilizaram materiais de fechamento dural. Os métodos de reparação dural ainda não são os ideais, mas existe o consenso que a lesão deve ser reparada sempre na forma aguda, a fim de evitar e prevenir complicações e seqüelas.
This study aimed to evaluate spinal cord alterations after dural repair with: simple interrupted suture, collagen membrane or fibrin glue using histopathogical analysis. All activities were performed in the São Paulo University Medical School General Hospital Traumatology and Orthopedic Division. Seventy Wistar rats were used, but 34 were excluded due to anesthetic or surgery problems. Animals were kept isolated for 24 days, then killed and histological samples collected. Pathology Division assessed and graduated hyperemia, spinal cord degeneration, necrosis and cellular infiltration. Repair techniques provided higher alteration, mostly in cellular infiltration. Suture showed more severe necrosis, hyperemia and cellular infiltrates graduations. Collagen membrane provided higher alterations related to hyperemia, nerve degeneration and cellular infiltrates. Fibrin glue reparation had worse results in necrosis and cellular infiltrates graduation.Spine cord alterations in all groups, including control group, made us suppose possible reasons for the results: spine cord changes would be caused by surgical technique as iatrogenic injury, without clinical meaning; studied material would cause alterations in neural tissue; contact of neural tissue with extra dural environment, after injury, leading to the same mechanisms present in spinal cord traumatic injury. Despite all groups showed spinal cord alterations it was clear a higher intensity of injury when dural closing material were used. There is no ideal choice for dural repair material and more research is warranted to find better form of repairing dura mater.
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Lima, Patricia Rodrigues de. "Biopolímero de Fibrina como arcabouço biológico para células-tronco mesenquimais como potencial produtor osteogênico." Botucatu, 2019. http://hdl.handle.net/11449/182206.

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Orientador: Rui Seabra Ferreira
Resumo: Desenvolvido em 1990 por um grupo de pesquisadores do Centro de Estudo de Venenos e Animais Peçonhentos (CEVAP), no Estado de São Paulo, Brasil, o Biopolímero de Fibrina (BPF) possuía o principal objetivo de ser um adesivo à base de fibrina sem o uso de sangue humano, a fim de evitar a transmissão de doenças infecciosas por meio deste insumo. Após diversas pesquisas com o BPF, comprovou-se não somente sua capacidade adesiva, como também sua ação coagulante, sua ação como auxiliar no reparo ósseo e cartilaginoso e sua função como arcabouço para células-tronco mesenquimais (CTMs), devido ao fato de que o BPF possui uma estrutura tridimensional adequada. Em estudos recentes e ao exercer essa função, tal material não afetou o microambiente biológico das células, ou seja, permitiu a adesão, proliferação e diferenciação celular, e aderência e crescimento destas. Tais características, apresentadas pelo BPF, são desejáveis na maioria dos biopolímeros utilizáveis, o que ressalta a importância do aprofundamento das pesquisas com BPF e suas interações em experimentos in vivo. Assim, no capítulo 1 realizamos uma ampla revisão na literatura sobre biopolímeros de fibrina, células-tronco e reparação de tecido ósseo. No capítulo 2 é apresentado o artigo científico “Arcabouço de fibrina para células-tronco mesenquimais como potencial osteogênico”.
Abstract: Developed in 1990 by a group of researchers from the Center for the Study of Venomous and Poisonous Animals (CEVAP) in the State of São Paulo, Brazil, the Fibrin Biopolymer (GMP) had the main objective of being a fibrin-based adhesive without the use of human blood in order to avoid the transmission of infectious diseases by means of this input. After several investigations with BPF, it was verified not only its adhesive capacity, but also its coagulant action, its action as an aid in bone and cartilage repair and its function as a framework for mesenchymal stem cells (MSCs), due to the fact that the BPF has an adequate three-dimensional structure. In recent studies and in carrying out this function, such material did not affect the biological microenvironment of the cells, that is, it allowed cell adhesion, proliferation and differentiation, and adhesion and growth of these cells. These characteristics, presented by BPF, are desirable in most usable biopolymers, which underscores the importance of deepening GMP research and its interactions in in vivo experiments. Thus, in Chapter 1 we conducted a broad review in the literature on biopolymers of fibrin, stem cells and repair of bone tissue. In chapter 2 the scientific paper "Fibrin scaffold for mesenchymal stem cells as osteogenic potential" is presented.
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10

Yeromonahos, Christelle. "Nanostructure des fibres de fibrine." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00639435.

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La formation d'un caillot de fibrine, processus clé de la coagulation sanguine, implique la polymérisation des monomères de fibrinogène en un réseau de fibres de fibrine. Bien que ce réseau contrôle l'ensemble des propriétés mécaniques du caillot et constitue le squelette sur lequel se base la reconstruction des tissus, sa structure aux échelles inférieures au micron est très mal caractérisée. Nous avons démontré que l'analyse du spectre de lumière visible transmis à travers un caillot permet de déterminer simultanément, quantitativement et en conditions quasi-physiologiques, plusieurs paramètres essentiels de cette nanostructure, à savoir le rayon et la concentration interne en protéines des fibres. Cette méthode de spectrophotométrie a montré le caractère extraordinairement poreux de ces fibres et comment l'environnement de la réaction (concentrations en fibrinogène, en thrombine, température, force ionique) influe sur leur dimension et leur porosité. Cette méthode a ensuite permis de caractériser les effets respectifs sur cette structure de différentes molécules anti-coagulantes, montrant l'action spécifique de l'enoxaparine par rapport aux héparines non-fractionnées et au pentasaccharide. Enfin, nous avons construit un prototype à vocation hospitalière (spectrophotomètre) afin d'étudier la cinétique de polymérisation de la fibrine, non seulement en système purifié en combinaison avec nos spectres de diffusion de rayons X, mais également sur des plasmas de patients présentant des troubles de l'hémostase. Des discussions sont en cours avec un laboratoire pharmaceutique afin d'intégrer cette méthode sur des appareils de diagnostic.
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Books on the topic "Fibring"

1

Gabbay, Dov M. Fibring logics. Oxford: Clarendon Press, 1999.

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Lane, D. A., ed. Fibrin formation and Fibrinolysis. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110871951.

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Waclawiczek, Hans-Werner, ed. Progress in Fibrin Sealing. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-48362-2.

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4

Günther, Schlag, and Redl Heinz, eds. Fibrin sealant in operative medicine. Berlin: Springer-Verlag, 1986.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71359-0.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71391-0.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71453-5.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82880-5.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-95513-6.

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Schlag, Günther, and Heinz Redl, eds. Fibrin Sealant in Operative Medicine. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-95515-0.

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Book chapters on the topic "Fibring"

1

Caleiro, C., and A. Sernadas. "Fibring Logics." In Universal Logic: An Anthology, 389–96. Basel: Springer Basel, 2012. http://dx.doi.org/10.1007/978-3-0346-0145-0_29.

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Beckert, Bernhard, and Dov Gabbay. "Fibring Semantic Tableaux." In Lecture Notes in Computer Science, 77–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/3-540-69778-0_15.

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Governatori, Guido, Vineet Padmanabhan, and Abdul Sattar. "On Fibring Semantics for BDI Logics." In Logics in Artificial Intelligence, 198–210. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45757-7_17.

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Marcelino, Sérgio, and Carlos Caleiro. "Disjoint Fibring of Non-deterministic Matrices." In Logic, Language, Information, and Computation, 242–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-55386-2_17.

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Francez, Nissim. "On Fibring Feature Logics with Concatenation Logics." In Logical Aspects of Computational Linguistics, 200–211. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48975-4_10.

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Coniglio, Marcelo Esteban, and Martín Figallo. "A Formal Framework for Hypersequent Calculi and Their Fibring." In Studies in Universal Logic, 73–93. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10193-4_4.

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Stief, T. "Fibrin." In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49054-9_1111-1.

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Kerbl, Markus, Philipp Heher, James Ferguson, and Heinz Redl. "Fibrin." In Biomaterials from Nature for Advanced Devices and Therapies, 159–75. Hoboken, New Jersey: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119126218.ch10.

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Stief, T. "Fibrin." In Springer Reference Medizin, 862. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_1111.

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Salajegheh, Ali. "Fibrin." In Angiogenesis in Health, Disease and Malignancy, 103–9. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28140-7_17.

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Conference papers on the topic "Fibring"

1

Karges, H. E. "Ultrastructure of the Fibrin Fibril Revealed by Electron Microscopical Investigations." In 63rd Annual Meeting of the Society of Thrombosis and Haemostasis Research. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1680178.

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Berk, H. R., and H. Clark. "SHEAR AND FIBRIN CLOT FORMATION; ROLE OF FPB RELEASE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643317.

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It is well known that flow conditions affect many aspects of hemostasis. These effects range from gross morphological differences of thrombi formed at different flow rates to platelet activation to lysis. In addition, fibrin degradation products can influence blood flow. This investigation concerns itself with the effect of shear on the later stages of fibrin polymerization.Fibrinogen (human, Kabi) is reacted with thrombin (human, Sigma) under Couette flow conditions (volume-averaged shear 0-250 sec-1) in a pH 6.8, 4mM CaC12 HEPES buffered solution (I.S.-.15). Reaction times are chosen to achieve 30% FPA removal for various IT], Reptilase and Crotalase. Low Reynolds number hydrodynamic theory is used to investigate theoretical effects of shear on fibrils.The effect of shear on final clot formation is measured in terms of clot mass (%Pt). The effects of shear on orientation, diffusion and coagulation on the protofibril-fibril stage account for the initial decrease in %Pt at low shear. It is determined that the shear at which %Pt reaches a minimum (Gcrit) is thrombin concentration dependent. Lateral aggregation of fibrils is identified as the critical variable, with fibril breakage accounting for the increase in %Pt with increasing shear. The theory that fibrin formation proceeds by oligomer-oligomer addition is supported.Using hydrodynamic theory, a relationship betv/een axial ratio and Gcrit is obtained (assuming tensional or buckling failure). Using a hypothetical relationship between thrombin concentration and fiber axial ratio, a theoretical Gcrit versus IT] is obtained. This theoretical relationship is similar to that obtained experimentally, supporting the notion of shear induced breakage.Calcium is shown to increase Gcrit for a given [T]Experiments with Crotalase and Reptilase implicate FPB removal as an important factor in the minimum position. This provides an important insight into the significance of FPB removal in in vivo clot formation and shear stability.
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3

Lai, Victor K., Allan M. Kerandi, Spencer P. Lake, Robert T. Tranquillo, and Victor H. Barocas. "Collagen Network Architecture Varies Between Pure Collagen and Collagen-Fibrin Co-Gels." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80738.

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Naturally-occurring extracellular matrix (ECM) proteins, e.g. collagen I and fibrin, play an important role in tissues, conferring structural integrity and providing a biochemical environment for eliciting important cellular responses (e.g. migration). Tissue engineers use a variety of matrix polymers as initial scaffolds for seeding cells, sometimes in combination with one another (e.g. collagen-fibrin [1]). For example, our group fabricates arterial tissue equivalents (TEs) by seeding cells in a fibrin gel, which is gradually degraded over time and replaced by cell-produced collagen [2]. While the structure and mechanics of individual ECM proteins have been studied extensively, how multiple fibrillar networks interact to confer overall mechanical behavior remains poorly understood. Narrowing this gap in knowledge of scaffolds comprising multiple fibril networks is crucial in allowing for more rational design in tissue engineering, as cells react differently according to their mechanical environments. For collagen-fibrin networks in particular, early efforts in elucidating interactions between these two fibril networks in co-gels have proven inconclusive due to inconsistent findings from various groups. Recent modeling efforts by our group have shown that simple “series” and “parallel” type interactions provide bounds for the mechanical behavior of collagen-fibrin co-gels [3]. In addition, experiments on pure collagen and fibrin vs. their respective networks from collagen-fibrin co-gels after digestion showed slight differences in mechanical behavior [4]. These previous studies have focused on the composition-function relationship between collagen and fibrin. The objective of the current work is to explore how collagen network architecture changes in the presence of the fibrin network in collagen-fibrin co-gels, thereby providing an added dimension to our understanding of collagen-fibrin systems by elucidating structure-composition-function relationships between collagen and fibrin.
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4

Cheng, Liang, William S. Oates, Ongi Englander, and Anant Paravastu. "A Computational Model for Structural Evolution of Protein Fibrils." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3649.

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A phase field modeling framework is developed to quantify structure evolution of protein fibrils in solution. The modeling framework employs a set of multi-physics constitutive relations to predict time dependent protein fibril structural evolution. The balance relations include chemical potential relations, microforces that govern local protein structure evolution, linear momentum and conservation of mass. Anisotropic formation of protein fibrils is controlled by protein monomer microforces and chemical fluxes to obtain long fibril growth from small seed particles. The theoretical model is implemented numerically using a nonlinear finite element phase field modeling approach which couples nonlinear mechanics with microscopic protein fibril structure evolution and chemical behavior. For comparisons to the model, the self-healing RADA16-I protein fibrils are characterized using transmission electron microscopy before and after ultrasonic radiation. Comparisons illustrate quantitative model predictions that govern spontaneous protein fibril self-healing that is predicted on the time scale of several hundred hours. The underlying physical mechanisms associated with self-assembly of the protein fibrils are discussed.
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Minno, G. Di, A. M. Cerbone, F. Cirillo, M. Colucci, N. Semararo, G. Di Santo, P. L. Mattioli, M. Mancini, and A. Quattrone. "ABNORMAL FIBRINOGEN (FIBRINOGEN NAPLES) CHARACTERIZED BY DETECTIVE INTERACTION WITH THROMBIN AND PLASMIN IN TWO YOUNG SIBLINGS WITH ARTERIAL THROMBOSIS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644698.

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Prolonged thrombin time (partially corrected by calcium chloride) and normal reptilase time were found in the plasma of two siblings with arterial thrombosis. Their purified fibrinogen showed similar abnormalities as well as impaired fibrino-peptide release in response to thrombin, delayed polymerization of pre-formed fibrin monomers and normal sialic content. Binding of radiolabelled thrombin by patient's fibrin was 30% of normal. Supernatants from patients' fibrin clots contained abnormal amounts of thrombin (not adsorbed by fibrin) and caused abnormal enhancement of platelet aggregation and ATP secretion from platelets exposed to sub-threshold concentrations of ADP or epinephrine. Hirudin suppressed the enhancing effect of the supernatant and substitution of γ-thrombin for α-thrombin led to normalization of platelet response. Studies on fibrinolysis showed that the abnormal fibrinogen from these patients as well as its naturally occurring derivative fibrin are highly resistant to lysis by plasmin. Thus our data support the concept that, in addition to the enhanced activation of platelets by residual free thrombin, thrombosis in these patients is the result of an impaired sensitivity of fibrinogen the lytic effect of plasmin.
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6

Lai, Victor K., Edward A. Sander, Spencer P. Lake, Robert T. Tranquillo, and Victor H. Barocas. "Collagen Network Topology is Influenced by Collagen Concentration, But Not by Co-Gelation With Fibrin." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53239.

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Extracellular matrix (ECM) proteins (e.g. collagen, elastin) play an important role in biological tissues. In addition to conferring mechanical strength to a tissue, the ECM provides a biochemical environment essential for modulation of cellular responses such as growth and migration. Collagens are the dominant protein of the ECM, with collagen type I being most abundant. Our group and others have shown that the mechanical properties of a collagen I matrix change with collagen concentration, and when formed in the presence of a secondary fibril network such as fibrin [1]. We are interested in collagen-fibrin systems because our group uses fibrin as the starting scaffold material for cardiovascular tissue engineering, which produces interpenetrating collagen-fibrin matrices during the remodeling process as the fibrin network is degraded and replaced with cell-deposited collagen [2]. Fibrin and collagen networks are also present together around the thrombus during the wound healing process. Research has shown that ECM mechanical properties are correlated with their overall network structure characteristics such as fibril diameter [3]. Currently we have a modeling framework that generates an ECM microstructural network which can be used to predict the overall properties of a bioengineered tissue [4]. This framework allows exploration of the structure-function relation, but how the structure depends on composition remains poorly understood, especially in multi-component gels. Thus, the objective of this work was to quantify the collagen network architecture in pure collagen gels of different concentrations and in collagen-fibrin co-gels.
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7

Dee, Derek, Fan Bu, Lanfang Shi, and Sara Zamani. "Comparing the structure and functionality of amyloid fibrils assembled from peanut, pea, lentil, and mung bean proteins." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/kkyn7687.

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Protein structure dictates functionality, and one way to dramatically alter protein structure is to induce proteins to self-assemble into amyloid fibrils. Amyloid fibrils, or nanofibrils, are long (100–1000’s nm), narrow (10’s nm), highly-organized protein aggregates that hold promise for various applications in biotechnology and food. Converting plant proteins into fibrils may improve their functionality and create sustainable materials, yet most nanofibril research has focused on animal-derived proteins, so there is a need to learn more about fibrils derived from plant proteins. This project compared fibrils assembled from crude protein extracts from peanut, pea, lentils and mung bean, comparing their fibril assembly kinetics, fibril structure, emulsification and viscosity properties. Peanut and mung bean fibrils assembled much faster (kPeanut = 0.90 ± 0.40 h-1, kMungbean = 0.95 ± 0.40 h-1) compared to pea and lentil fibrils (kPea = 0.19 ± 0.03 h-1, kLentil = 0.24 ± 0.01 h-1), at 80 °C, pH 2 with stirring. Fibrils from the different legume proteins displayed markedly different structures that could be generally classified as either long and straight (1000’s nm) or short and curly (100’s nm). The former are more similar to fibrils typically generated from animal proteins (e.g., whey, egg white proteins) while the latter are typical of legume protein fibrils presented in the literature. The longer/straighter or shorter/curly fibrils displayed unique functionalities (emulsion particle size and viscosity profiles) that did not directly correlate with fibril morphology, although several confounding factors limit the establishment of direct structure-function associations. This work indicates several approaches to optimize the assembly of legume protein fibrils that may find use in new plant-based materials and foods.
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Lai, Victor K., Edward A. Sander, Robert T. Tranquillo, and Victor H. Barocas. "Mechanical Properties of Collagen, Fibrin and Collagen-Fibrin Networks." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19138.

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The macroscopic mechanical properties of bio-engineered tissues are inextricably linked to their microstructure. Often, their microstructure is a complex arrangement of several different components (e.g. collagen, fibrin) that interact with each other to give a tissue its overall properties. These microstructural complexities are further compounded by the dynamic cell interactions with the extracellular matrix (ECM). Our group [1] uses fibrin as the starting scaffold material for cell seeding and tissue growth; over time, the underlying microstructure undergoes dynamic remodeling as the fibrin network is degraded and gradually replaced with collagen. Currently, we have a modeling framework that incorporates a single-component microstructure network to predict the mechanical properties of the engineered tissue [2]. However, this model is unable to capture the transient intermediate stages of tissue growth, during which the tissue is composed of interpenetrating collagen and fibrin networks at varying compositions. In this work, we have incorporated a second network into our model and compared these modeling results with experimental data obtained from uniaxial tests on acellular collagen-fibrin co-gels. This work represents one step in the progression of our model to capture better the relationships between tissue microstructure and macroscopic mechanical properties, with the ultimate goal of developing a comprehensive model framework for rational design of functional engineered tissues.
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Ribes, J. A., D. D. Wagner, and C. W. Francis. "FIBRIN-STIMULATED RELEASE OF VON WILLEBRAND FACTOR FROM ENDOTHELIAL CELLS IS LINKED TO FIBRINOPEPTIDE B CLEAVAGE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643772.

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von Willebrand factor (vWf) is synthesized in endothelial cells and stored in specialized organelles, the Weibel-Palade bodies. We have examined the role of fibrin as a potential physiological secretagogue of vWf from Weibel-Palade bodies using indirect immunofluorescence staining of endothelial cells to detect release. Addition of fibrinogen to endothelial cell cultures resulted in the formation of a clot, and this was temporally associated with vWf release. Addition to endothelial cells of preformed fibrin prepared by clotting fibrinogen with thrombin also stimulated release of vWf within 10 minutes. Hirudin inhibition or heat denaturation of clot-bound thrombin abolished most of the thrombin activity but did not diminish release. The role of fibrinopeptide A and B (FPA, FPB) cleavage in stimulating release was examined using reptilase or the venom from A. contortrix to selectively remove FPA or FPB. Release was stimulated by fibrin from which FPB had been cleaved by either thrombin or A. contortrix, while desAA fibrin prepared with Reptilase was an ineffective stimulus. The formation of a stimulatory fibrin clot with the contortrix enzyme, which does not cause release by itself, demonstrates that fibrin stimulation was completely independent of thrombin activity. The capacity to stimulate release was found to be independent of factor XIIIa crosslinking with both crosslinked and noncrosslinked FPB cleaved fibrins demonstrating stimulation. We conclude that fibrin stimulates rapid release of vWf from endothelial cells independent of thrombin activity and may function as a physiologic secretagogue. Furthermore, the stimulating capacity is dependant on cleavage of FPB suggesting that release is mediated by an active site near the N-terminal of the 3 chain or is dependent on a fibrin structure resulting from FPB cleavage.
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Karp, George, and Chung Y. Liu. "FIBRINOGENS NEW YORK II, III, AND IV : RELATIONSHIP BETWEEN ABNORMAL FIBRIN MONOMER POLYMERIZATION, BLEEDING TENDENCY, AND THROMBOTIC TENDENCY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643336.

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It has been proposed that a normal fibrin monomer polymerization is required for a normal fibrin potentiation of tPA-induced plasminogen activation. Accordingly, an abnormal fibrin moncmer polymerization may contribute to a thrombotic tendency. To investigate this possibility, three abnormal plasma fibrinogens (dysfibrinogenemia) have been studied and tentatively designated New York II (NY-II), New York III (NY-III), and New York IV (NY-IV) after the city where they were described.Each of these patients has a long thrombin clotting time (TCT), a long Reptilase clotxing time, and an abnormal fibrin monomer polymerization. The abnormal fibrin moncmer polymerization can be corrected by addition of Ca2+. NY-II is characterized by a normal level of plasma fibrinogen, but delayed fibrino-peptide release and marked prolongation of the TCI; NY-III, by a normal level of plasma fibrinogen and a normal fibririopeptide release; and NY-IV, by a low level of plasma fibrinogen, a normal fibrinopeptide release, and marked prolongation of the TCT. Each of these cases appears to be congenital, not acquired although the absence of data on relatives prevents definite conclusions. SDS-PAGE analysis of the mobility of the reduced abnormal fibrinogens shows no detectable abnormality, indicating no significantly altered molecular size of Aα, Bβ, and γ chains.No patient appears to be associated with either a bleeding or a thrombotic tendency. Thus, no direct association is observed between an abnormal fibrin monomer polymerization and a thrombotic tendency. Accordingly, fibrin monomer polymerization is not a function absolutly required for potentiation of plasminogen activation. However, based on the present observations and the observations previously described of abnormal fibrinogens with abnormal fibrin monomer polymerization from patients associated with bleeding and/or thrombotic tendency, a bleeding tendency seems to be correlated with a condition in which both a long TCT and an abnormal fibrin moncmer polymerization can not be normalized by addition of Ca2+.
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Reports on the topic "Fibring"

1

Silva, Igor Iuco Castro da. Platelet-Rich Fibrin: A Versatile Purpose for Alveolar Ridge Preservation. Science Repository, July 2019. http://dx.doi.org/10.31487/j.dobcr.2019.03.05.

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2

Liang, Wenbin, and Charles R. Martin. Template-Synthesized Polyacetylene Fibrils Show Enhanced Supermolecular Order. Fort Belvoir, VA: Defense Technical Information Center, October 1990. http://dx.doi.org/10.21236/ada228596.

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3

Nixdorf, R. D. Development of a Commercial Process for the Production of Silicon Carbide Fibrils. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/7914.

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4

Moraschini, Vittorio, Richard Miron, and Anton Sculean. Use of Platelet-Rich Fibrin for the treatment of intrabony and furcation defects: A systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, July 2020. http://dx.doi.org/10.37766/inplasy2020.7.0117.

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5

Chen, Chen, Peng Chen, Xia Liu, and Hua Li. Combined 5-Fluorouracil and Low Molecular Weight Heparin for the Prevention of Postoperative Proliferative Vitreoretinopathy in Patients with Retinal Detachment. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, August 2021. http://dx.doi.org/10.37766/inplasy2021.8.0117.

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Review question / Objective: The aim of this meta-analysis is to evaluate the efficacy and safety of intraoperative infusion of combined 5-fluorouracil and low molecular weight heparin (LMWH) for the prevention of postoperative proliferative vitreoretinopathy in patients with retinal detachment. Condition being studied: Postoperative proliferative vitreoretinopathy (PVR) is the primary cause of failure of retinal reattachment surgery. 5-fluorouracil (5-FU) inhibits the proliferation of fibroblasts, and suppresses collagen contraction. On the other hand, heparin reduces fibrin exudation, and inhibits the adhesion and migration of retinal pigment epithelial cells. We conduct this comprehensive literature search and meta-analysis to address whether intraoperative infusion of combined 5-FU and LWMH improves the primary success rate of pars plana vitrectomy, as well as reduces postoperative PVR. Our study aims to provide clinical evidence for retinal surgeons concerning their choice of intraoperative medication.
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6

Nixdorf, RD. Development of a Commercial Process for the Production of Silicon Carbide Fibrils - Draft Phase II Final Report. Office of Scientific and Technical Information (OSTI), October 2002. http://dx.doi.org/10.2172/814172.

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7

Hollar, W. E. Jr, and W. H. Mills. Engineering scale development of the Vapor-Liquid-Solid (VLS) process for the production of silicon carbide fibrils. Office of Scientific and Technical Information (OSTI), September 1993. http://dx.doi.org/10.2172/10125692.

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8

Ohnsorg, R. W., W. E. Jr Hollar, S. K. Lau, F. K. Ko, and K. Schatz. Engineering scale development of the vapor-liquid-solid (VLS) process for the production of silicon carbide fibrils. Phase 2. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/200670.

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9

Meza-Mauricio, Jonathan, Camila Pinheiro Furquim, Antonella Geldres, Gerardo Mendoza-Azpur, Belen Retamal-Valdes, and Marcelo Faveri. Is the use of platelet rich fibrin effective in the healing, pain and control of post-operative bleeding of palatine area after harvesting free gingival graft? A systematic review of randomized clinical studies. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, January 2021. http://dx.doi.org/10.37766/inplasy2021.1.0037.

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10

Meza-Mauricio, Jonathan, Camila Pinheiro Furquim, Antonella Geldres, Gerardo Mendoza- Azpur, Belen Retamal-Valdes, Vittorio Moraschini, and Marcelo Faveri. Is the use of platelet rich fibrin effective in the healing, pain and control of post-operative bleeding of palatine area after harvesting free gingival graft? A systematic review of randomized clinical studies. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, January 2021. http://dx.doi.org/10.37766/inplasy2021.1.0113.

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