Dissertationen zum Thema „CRR2“
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Blömacher, Margit [Verfasser]. „Characterization of mammalian CRN5 and CRN2 / Margit Blömacher“. Köln : Deutsche Zentralbibliothek für Medizin, 2013. http://d-nb.info/1052418589/34.
Der volle Inhalt der QuelleFredriksson, Anna, und Sebastian Sporrong. „Intensivvårdssjuksköterskans vårdande av patienter med kontinuerlig njurersättningsterapi : En observationsstudie“. Thesis, Högskolan i Borås, Akademin för vård, arbetsliv och välfärd, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-9410.
Der volle Inhalt der QuelleDreßen, Jochen. „Epitaxie und Charakterisierung oxidischer Schichtsysteme: BiSrCaCuO-Hochtemperatursupraleiter und ferromagnetisches CrO2“. Aachen : Shaker, 1999. http://deposit.d-nb.de/cgi-bin/dokserv?idn=970716621.
Der volle Inhalt der QuelleBrugel, D. „Theoretical studies of Cr2+(2) GaAs spectra“. Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303719.
Der volle Inhalt der QuelleAmbrosino, Mariacarmela <1978>. „Ottimizzazione di un protocollo di anticoagulazione regionale con citrato in CRRT“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6516/.
Der volle Inhalt der QuelleOptimization of a regional citrate anticoagulation protocol in CRRT Purpose: Prolonged anticoagulation and hypophosphatemia are well known drawbacks of CRRT. The aim of our study was to show the efficacy and safety of a regional citrate anticoagulation protocol for CVVH combined with a phosphate containing replacement fluid. Methods: We used our protocol, based on a citrate solution (18 mmol/l) combined with in a phosphate containing replacement fluid, in a small cohort of heart surgery patients. Results: Our protocol provided an adequate circuit lifetime and an excellent acid-base status in every patient. A low amount of phosphorus supplememntation was required only in a very few patients. Conclusions: Our protocol based on a citrate solution (18 mmol/l) combined with a phosphate containing replacement fluid, allows a better buffer balance control than using of a lower citrate solution. Moreover, an adequate circuit lifetime was obtained. Serum phosphate was steadily maintained in all patients. Only in a very few patients a low supplementation was required.
Schütte, Mark [Verfasser], und Stefan [Akademischer Betreuer] Dübel. „Crf2 - Ein neues Antigen von Aspergillus fumigatus / Mark Schütte ; Betreuer: Stefan Dübel“. Braunschweig : Technische Universität Braunschweig, 2009. http://d-nb.info/1175829587/34.
Der volle Inhalt der QuelleDreßen, Jochen [Verfasser]. „Epitaxie und Charakterisierung oxidischer Schichtsysteme: BiSrCaCuO-Hochtemperatursupraleiter und ferromagnetisches CrO2 / Jochen Dreßen“. Aachen : Shaker, 1999. http://d-nb.info/970716621/34.
Der volle Inhalt der QuelleMomozawa, Ai [Verfasser]. „Precipitation and Microstractural Change Mechanism in TiB2-W2B5-CrB2 Ceramics / Ai Momozawa“. Aachen : Shaker, 2007. http://d-nb.info/1164341049/34.
Der volle Inhalt der QuelleShek, Ka-wai. „DNASE2, CR2, TYK2 genes polymorphisms in systemic lupus erythematosus /“. View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38278765.
Der volle Inhalt der QuelleShek, Ka-wai, und 石家偉. „DNASE2, CR2, TYK2 genes polymorphisms in systemic lupus erythematosus“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B45012945.
Der volle Inhalt der QuelleRudin, Susanne. „Mobilisering av patienter som genomgår kontinuerlig dialys på en intensivvårdsavdelning : en litteraturstudie“. Thesis, Sophiahemmet Högskola, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:shh:diva-3104.
Der volle Inhalt der QuelleKaiser, Abigail M. „Localization of Five Target Proteins in Tachyzoites of Toxoplasma gondii“. Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7820.
Der volle Inhalt der QuelleLott, Nikole T. „Regulation of the Histone Methyltransferase Kmt5/Set9 and its Role in Genome Stability“. Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1323383595.
Der volle Inhalt der QuelleAnand, Sneha Nitish. „Investigating the behavioural and molecular functions of Cry1 and Cry2 using mouse mutants“. Thesis, Open University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551621.
Der volle Inhalt der QuelleOstheimer, Gerard Joseph. „Proteins required for chloroplast group II intron splicing : CRS2 and its associated factors /“. view abstract or download file of text, 2003. http://wwwlib.umi.com/cr/uoregon/fullcit?p3080594.
Der volle Inhalt der QuelleTypescript. Includes vita and abstract. Includes bibliographical references (leaves 111-124). Also available for download via the World Wide Web; free to University of Oregon users.
Lockley, Michelle. „Activity of Adenoviral E1A CR2 Deletion Mutants in Ovarian Cancer“. Thesis, Queen Mary, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504564.
Der volle Inhalt der QuelleReljic, Rajko. „The interaction of CD23 and CR2 and its functional consequences“. Thesis, King's College London (University of London), 1996. https://kclpure.kcl.ac.uk/portal/en/theses/the-interaction-of-cd23-and-cr2-and-its-functional-consequences(01e4a5aa-37fc-4892-8fa8-458ac1183001).html.
Der volle Inhalt der QuelleHerriot, Sandrine. „Source laser accordable pour le moyen infrarouge : Cr2+ : ZnSe polycristallin“. Paris 11, 2002. http://www.theses.fr/2002PA112321.
Der volle Inhalt der QuelleDevelopment of efficient, compact, tunable solid state laser for the mid-infrared (MIR) at room temperature has initiated the study of transition metal ion TM doped II-VI compounds. Among those compounds, chromium ion incorporated into ZnSe host crystal represent a solid state laser material allowing radiative emission at room temperature in the spectral range of 2-3 mM. This work concern the study and realization of tunable, room temperature operating, solid state laser for MIR based on Cr2+ :ZnSe polycrystal. Advantages of polycrystals are mainly based on the elaboration cost and available dimension compared to the single crystals. We have elaborated Cr2+ :ZnSe laser materials by thermal diffusion doping method using both single and poly-crystals of ZnSe. Different process involved during the diffusion were analyzed like incorporation of chromium into substitutional site, homogenization of the doping and the recrystallization process. We have thus determined parameters governing the diffusion of chromium into the ZnSe and elaborated single and poly-crystals with different concentration on Cr (since 2. 10^18 to 5. 10^19 ions. Cm^(-3)). Then, we have proceed to spectroscopic characterization of those materials. We observed no difference in the shape and bandwidth of the absorption spectrum (1400-2200 nm) associated to the optical transition 5T-2 → 5E of Cr2+, inserted either in single or poly-crystal of ZnSe. The same observation was done concerning the shape of the room temperature photo-luminescence spectra (2000-3000 nm) obtained with either single or poly-crystal of Cr2+ :ZnSe. Furthermore, a dynamical characterization of such materials indicated an excited state lifetime at 300K in the order of 4 to 5 ms for Cr concentration of 5. 10^18 ions. Cm^(-3). Finally, laser efficiency of those materials were also studied. A comparable optical-optical laser efficiency were obtained, in a same laser cavity, with both Cr2+ :ZnSe materials : single-crystal (33%) and poly-crystal (28%). This result is deeply associated to the high optical quality of the poly-crystal (large grain size) laser material obtained using our elaboration method : Thermal diffusion doping. We have also obtained with such materials a tunability between 2. 2 to 2. 7 mM at room temperature. We have thus demonstrated that Cr2+ :ZnSe poly-crystals are highly efficiency, tunable, room temperature operating, laser materials for the MIR and are in competition with Cr2+ :ZnSe single-crystals
Murillo, Avecillas Marcos Fernando. „Implementación de un sistema de gestión de la calidad en las terapias continuas de depuración extrarenal (TCDE)“. Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671632.
Der volle Inhalt der QuelleEntre 5-23% de pacientes en UCI desarrollan fracaso renal agudo, un elevado porcentaje de éstos requieren TCDE. La mortalidad de éstos ronda el 60%. Las TCDE requieren personal capacitado, su manejo es sofisticado y existen riesgos que pueden comprometer la seguridad del paciente. Análisis Modal de Fallos y Efectos (AMFE) es una herramienta para evaluar riesgos, descubrir fallos proactivamente y proponer acciones correctivas para reducir/eliminar riesgos potenciales. Objetivos: Principal: aplicar la herramienta AMFE en las TCDE para potenciar la seguridad del paciente en UCI del Hospital Mutua Terrassa, mejorar la calidad asistencial haciendo una práctica más segura, identificando puntos de mayor riesgo en nuestra actividad e introduciendo medidas correctoras que los minimicen, elaborando mapa de riesgos del proceso asociado a las TCDE para identificar los más frecuentes y graves. Secundarios: elaborar planes de actuación en función de los riesgos detectados e instaurar medidas correctivas. Implicar a los profesionales en la cultura de seguridad y estimular la notificación de efectos adversos. Finalmente, mostrar el grado de satisfacción. Materiales y Métodos: Durante el año 2015 describimos tareas y procedimientos asociadas a TCDE distribuidas en: indicación de TCDE, colocación y manejo del catéter, prescripción médica, cebado, conexión y manejo del circuito extracorpóreo, monitorización de la terapia, finalización y desconexión. Calculamos el índice de prioridad de riesgo (IPR) que evaluó la magnitud de cada riesgo relacionado con gravedad, ocurrencia y detección. Debido al elevado número de riesgos detectados y potencial gravedad (pacientes críticos y puntuaciones IPR elevadas) diseñamos una matriz ocurrencia/severidad y un risk ranking table que permitió identificar riesgos de alta prioridad sobre los que debíamos diseñar y establecer medidas correctivas. Durante el año 2016 las implementamos y doce meses más tarde analizamos los resultados mediante cálculo del porcentaje de reducción del IPR (% Reducción IPR = IPRi-IPRf/IPRi) y el impacto de las distintas medidas correctivas. Finalmente elaboramos una encuesta que muestra el grado de satisfacción. Resultados: Detectamos 181 riesgos, seleccionamos 12 por puntuación IPR y matriz de ocurrencia/severidad, instauramos 14 medidas correctivas relacionadas con el catéter, prescripción médica y monitorización del circuito. Al año de instauradas hubo una reducción del IPR medio del 62%. Comparando el año previo con número similar de pacientes, observamos reducción del 23,4% de disfunción del catéter; 36% coagulación del circuito extracorpóreo, calculándose 118 hemofiltros no desechados y 5670 horas ganadas/año de eficiencia de la terapia. Así mismo, mejora en 13% de adecuación de dosis y menor diselectrolitemia. Calculándose un ahorro de 23375 euros con respecto al año previo. Finalmente se ha evitado un 22,1% de transfusión de hemoderivados imputables a pérdida hemática por coagulación. La satisfacción del personal involucrado con las TCDE en la UCI del HUMT, de los cambios ejercidos en la ejecución de las TCDE a partir de los resultados obtenidos por medio del AMFE, ha sido medida a través de una encuesta y en general han sido bien aceptados. Conclusiones El desarrollo del AMFE en TCDE es una herramienta útil para la identificación y evaluación de los posibles fallos y riesgos asociados a la terapia. En tan sólo un año de implementar las medidas correctivas se han reducido de forma muy significativa los puntos críticos de seguridad en las TCDE, permitiendo mejora de la eficacia de la terapia y una reducción de costes. Se ha estimulado el trabajo en equipo y ha incrementado la cultura de seguridad. Los cambios efectuados han sido aceptados por el personal involucrado en las TCDE.
Between 5-23% of Intensive Care Unit (ICU) patients develop acute renal failure and a high percentage of these require CRRT. The mortality of those who require CRRT is around 60%. CRRT are complex and require trained staff, sophisticated management, and there are risks that can compromise patient safety. Failure Mode and Effects Analysis (FMEA) is a tool to evaluate risks, proactively discover faults and propose corrective actions to reduce/eliminate potential risks. Objectives: Main: Apply FMEA tool in the CRRT to enhance patient´s safety in ICU of the Mutua Terrassa Hospital, improve the quality of care by making a safer practice, identifying points of greatest risk in our activity and introducing corrective measures that minimize them, developing risk map of the process associated with CRRT to identify the most frequent and serious adverse events. Secondary: Developing action plans based on the risks detected and establishing corrective measures. Involve ICU professionals in the safety awareness and encourage the reporting of adverse events. Finally, show the degree of satisfaction. Materials and methods: During 2015 we described tasks and procedures associated with CRRT distributed: indication of CRRT, placement and management of the catheter, medical prescription, priming, connection and management of the extracorporeal circuit, monitoring of therapy, termination and disconnection. We calculated the risk priority index (RPI) that evaluated the magnitude of each risk related to severity, occurrence and detection. Due to the high number of detected risks and potential severity (critical patients and very high RPI scores) we designed an occurrence/severity matrix and a risk ranking table that allowed us to identify high priority risks on which we should design and establish corrective measures. During 2016 we implemented them and twelve months later we analysed the results by calculating the reduction of RPI percentage (Reduction RPI% = iRPI-fRPI / iRPI) and the impact of the different corrective measures. Finally, we prepare a survey that shows the degree of satisfaction. Results: We detected 181 risks, we selected 12 by RPI score and occurrence/severity matrix, we put in place 14 corrective measures related to the catheter, medical prescription and circuit monitoring. A year of introduction, there was a reduction of the average RPI of 62%. Comparing the previous year with a similar number of patients, we observed a 23,4% reduction in catheter dysfunction; 36% coagulation of the extracorporeal circuit, calculating 118 haemofilters non-discarded and 5,670 hours gained / year of therapy efficiency. Furthermore, a 13% improvement in dose adequacy and less dyselectrolytemia were observed. All of this has meant an estimated savings of 23,375 Euros compared to the previous year. Finally, a 22.1% of blood product transfusions due to blood loss for circuit clotted has been avoided during the past year. The satisfaction of the personnel involved with the CCRT in the ICU of the HUMT, of the changes made in the execution of the CRRT from the results obtained through the FMEA, has been measured through a survey and in general they have been well accepted. Conclusions The development of FMEA in CRRT is a useful tool for the identification and evaluation of possible failures and risks associated with therapy. In just one year of implementing the corrective measures, the critical safety points in ICU CRRT has been significantly reduced, allowing an improvement in the efficacy of therapy and a reduction in costs. Teamwork has been encouraged and the safety awareness has increased. The changes made have been accepted by the staff involved in the CRRT.
Huitema, Edgar. „Determinants of nonhost resistance to phytophthora infestans“. The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1117038573.
Der volle Inhalt der QuelleKönig, Christian. „Nanomagnetismus von epitaktischen Fe(110)- und CrO2(100)-Strukturen im Hinblick auf potentielle spinelektronische Anwendungen“. [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98134495X.
Der volle Inhalt der QuelleDucarouge, Benjamin. „Régulation des systèmes d'adhérence cellulaire par le CRF2 : un effecteur du stress dans le tube digestif“. Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00767103.
Der volle Inhalt der QuelleMarks, Lori J., und M. Jernigan. „CRA2 (Concrete-Representational-Abstract and Constructed Response Assessment): Incorporating Language Skills into Math Instruction and Assessment“. Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/3534.
Der volle Inhalt der QuellePistolesi, Valentina <1979>. „CRRT nel paziente ad alto rischio emorragico: ottimizzazione di un protocollo di anticoagulazione regionale con citrato“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4493/.
Der volle Inhalt der QuelleRegional citrate anticoagulation (RCA) is a valid option in patients at high risk of bleeding. The aim was to evaluate the efficacy and safety of RCA-CVVH using a low concentration citrate solution in critically ill patients at high risk of bleeding undergoing Continuous Renal Replacement Therapies (CRRT) for Acute Kidney Injury (AKI) following cardiac surgery. Methods: In cardiac surgery patients we adopted, as alternative to heparin or no anticoagulation (no-AC), RCA-CVVH using a 12 mmol/L citrate solution. Criteria for switching to RCA: early circuit clotting or heparin related complications. To facilitate CVVH settings, we developed a mathematical model to estimate metabolic citrate load and calcium loss. Results: Thirty patients were switched to RCA-CVVH from no-AC or heparin. RCA-CVVH filter life (50.5 ± 35.8 hrs, median 41, 146 circuits) was significantly longer (p<0.0001) if compared to heparin (29.2±22.7 hrs, median 22, 69 circuits) or no-AC (24.7±20.6 hrs, median 20, 74 circuits). Probability of circuit running at 24, 48, 72 hrs was higher during RCA-CVVH (p<0.0001). Targets circuit and systemic Ca++ were easily maintained inside the target range (0.37±0.09 and 1.18±0.13 mmol/L). During RCA-CVVH no patients had bleeding complications and transfusion rate was lower if compared to other AC modalities (0.29 vs 0.69 blood units/day, p<0.05). PLT count (p=0.012) and AT-III activity (p=0.004) increased throughout days of RCA reducing supplementation needs. RCA has been stopped for citrate accumulation in one patient (total calcemia/s-Ca++ >2.5). Conclusions: In this study, RCA allowed to safely prolong filter life decreasing transfusion rate and supplementation needs for AT-III and PLT. The use of a mathematical model allowed to simplify CVVH settings. Therefore, RCA should be worthy of more consideration as first choice CRRT anticoagulation modality in patients at high risk of bleeding.
江刺, 史子. „DNA損傷チェックポイントに必須な分裂酵母Crb2の研究“. 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/181155.
Der volle Inhalt der QuelleFrigerio, Mark. „Synthetic studies on novel bryostatin analogues and their interaction with the CRD2 of protein kinase C“. Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446848/.
Der volle Inhalt der QuelleMoitrier, Sarah. „Compétition entre populations de cellules normales et transformées“. Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET027/document.
Der volle Inhalt der QuelleDuring the development of a tumour in a tissue, the cancer cells are surrounded by healthy cells. The interactions between these two cell types, transformed and normal, play an important role in the tumour stability, but remain to this day poorly understood. The aim of this thesis was to establish in vitro assays to study the interactions between populations of normal and transformed cells.We benefited from a light-sensitive cell line, constructed by Olivier Destaing (IAB, Grenoble). When they are exposed to blue light, these cells overactivate the protein Src, which is known to be overexpressed in many cancers. Otherwise, they keep a normal phenotype. Using these cells, called “OptoSrc”, in combination with an optical setup, we are able to create mosaic tissues in which the pattern of mutated cells is determined by the blue illumination pattern. Our system has several advantages: a selective control in time and space of the group of transformed cells, and a gradual and reversible activation of the oncoprotein.We have shown that when we illuminate a circular islet of cells from a monolayer of OptoSrc cells, the activated cells were collectively extruded, resulting in a cohesive three-dimensional aggregate on top of the monolayer. We can control the size and appearance time of this spheroid by tuning, respectively, the area and frequency of illumination. Besides, this collective extrusion is reversible when the blue light stimulation is stopped. Finally, we have shown that the formation of this three-dimensional aggregate coincides with the loss of E-cadherin at the membrane, as well as the apparition of vimentin, for the illuminated OptoSrc cells. Our results suggest that a group of cells overexpressing the protein Src, in a monolayer of normal cells, undergoes a partial epithelial-to-mesenchymal transition
Collura, Ada. „Rôle de la protéine Crb2 dans les systèmes de surveillance de l'intégrité du génome chez Schizosaccharomyces pombe“. Paris 11, 2005. http://www.theses.fr/2005PA112104.
Der volle Inhalt der QuelleThe appearance of DNA lesions or problems during the replicative phase or during microtubule attachment to centromeres during mitosis in Schizosacharomyces pombe, like in all other eucaryotes, all result in the activation of checkpoint systems responsible for DNA repair, and for correct DNA replication and mitotic spindle assembly. When anomalies in one of these cellular processes are detected, the different checkpoint systems can nhibit or retard cell cycle progression, thus allowing the cell machinery to repair the problem encountered without affecting the transmission of genetic information to the daughter cells. During my PhD, I have studied, on one hand, the Dset1 allele of S. Pombe, an allele which is deficient in methyltransferase activity towards lysine 4 of the histone H3. More specifically, I have studied the effect of mutations in checkpoint genes on the response of the Dset1 strain to different genotoxic treatments. I have also investigated a new function assigned to the Crb2 protein of S. Pombe. This protein is essential for the activation of the Chk1 kinase after induction of the DNA repair checkpoint. In this pathway Crb2 plays the role of an adapter, recruiting Chk1 to the vicinity of the Rad3 kinase, thus enhancing Chk1 phosphorylation by Rad3. The Crb2 protein is also necessary for cell survival in response to chronic exposure to hydroxyurea or to DNA polymerase inhibition
Bowen, Galo Emilio. „Service and Ultimate Limit State Flexural Behavior of One-Way Concrete Slabs Reinforced with Corrosion-Resistant Reinforcing Bars“. Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23205.
Der volle Inhalt der QuelleDeformability of the concrete slab-strip specimens was defined with ultimate-to-service level ratios of midspan deflection and curvature. The MMFX2 and Enduramet 32 one-to-one replacement specimens had deformability consistent with the Grade 60 controls, demonstrating that bridge deck slabs employing high strength reinforcement without a defined yield plateau can still provide sufficient ductility at an ultimate limit state. A reduction in bar quantity and cover provided acceptable levels of ductility for the 2304 specimens and MMFX2 reinforced slabs.
Master of Science
BOUILLIE, SYLVIE. „Contribution a l'analyse moleculaire du role du recepteur pour le virus d'epstein-barr et pour le c3d (cr2, cd21) : identification des voies intracellulaires de signalisation regulees par le cr2 dans les lymphocytes b humains“. Paris 6, 1998. http://www.theses.fr/1998PA066426.
Der volle Inhalt der QuelleMond, Michael [Verfasser]. „Cr2+-dotierte Chalkogenide - Neue durchstimmbare Festkörperlaser und passive Güteschalter im mittleren infraroten Spektralbereich / Michael Mond“. Aachen : Shaker, 2003. http://d-nb.info/1172611653/34.
Der volle Inhalt der QuelleFigueiredo, Camila Soares. „Interação das proteínas CRY1, CRY2 E VIP3 de Bacillus thuringiensis no controle de Anticarsia gemmatalis, Chrysodeixis includens e Spodoptera frugiperda /“. Jaboticabal, 2017. http://hdl.handle.net/11449/149877.
Der volle Inhalt der QuelleBanca: Vivian Boter Bergamasco
Banca: Sonia Marli Zingaretti
Banca: Odair Aprecido Fernandes
Banca: Ana Maria Guidelli Thuler
Resumo: Este trabalho teve como objetivo estudar a toxicidade e a interação entre proteínas Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab e Vip3Aa em lagartas neonatas de Anticarsia gemmatalis, Chrysodeixis includens e Spodoptera frugiperda. Lisados das proteínas foram utilizados em bioensaios com lagartas neonatas para determinar a CL50 e CL90 das proteínas Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab e Vip3Aa e realizar experimentos histopatológicos. Ensaios de competição, entre as proteínas Cry1, Cry2 e Vip3 biotiniladas, foram realizados com as proteínas das vesículas de membrana da microvilosidade apical do intestino médio ("Brush Border Membrane Vesicles" - BBMV) das lagartas. Foi feita a purificação de receptores para toxina Cry1Ac a partir da BBMV de A. gemmatalis e C. includens por afinidade seguida da identificação das proteínas ligantes. As toxinas Cry1A e Cry2A demonstraram maior toxicidade para A. gemmatalis e C. includens que a proteína Vip3Aa, porém o inverso foi observado em S. frugiperda. As lagartas da espécie A. gemmatalis se mostraram mais suscetíveis as proteínas testadas do que as de S. frugiperda e C. includens. As espécies diferiram também quanto ao tipo de interação entre as toxinas. Enquanto para S. frugiperda e C. includens, as interações foram sinérgicas, para A. gemmatalis foram predominantemente antagônicas. As proteínas se uniram aos receptores presentes nas BBMV de S. frugiperda, A. gemmatalis e C. includens, permitindo inferir sobre a presença e ausência de comp... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work aimed to study the toxicity and interaction between Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab and Vip3Aa proteins in neonate larvae of Spodoptera frugiperda, Anticarsia gemmatalis and Chrysodeixis includens. Lysates containing proteins were used in bioassays for the determination of LC50 and LC90 of the Cry1Ab, Cry1Ac, Cry2Aa, Cry2Ab and Vip3Aa proteins. Histopathological experiments were realized with A. gemmatalis, C. includens (fed with Cry1Ac and Vip3Aa) and S frugiperda (fed with Cry1Ab and Vip3Aa). Competition assays, among biotinylated Cry1, Cry2 and Vip3 proteins, were performed with brush border membrane vesicles (BBMV) proteins from A. gemmatalis, C. includens and S. frugiperda. Purification of Cry1Ac receptors from A. gemmatalis and C. includens BBMV was performed by affinity followed by identification of binding proteins. The Cry1A and Cry2A toxins demonstrated higher toxicity to A. gemmatalis and C. includens than the Vip3Aa protein, but the inverse was observed to S. frugiperda. A. gemmatalis larvae were more susceptible as Cry and Vip proteins than as S. frugiperda and C. includens. Species differed about type of protoxins interaction. While for S. frugiperda and C. includens, the protoxins showed as synergistic interactions, for A. gemmatalis they were predominantly antagonistic. It was possible to infer about presence and absence of competition of the receptors in the BBMV from S. frugiperda, A. gemmatalis and C. includens. Histopathological changes as vacuolization and disruption were observed in the intestine from S. frugiperda larvae, fed with Cry1Ab and Vip3Aa and A. gemmatalis and C. includens, fed with Cry1Ac and Vip3Aa. Putative receptors were to identified from A. gemmatalis and C. includens to Cry1Ac toxin. The combination of Cry and Vip proteins, as well as helping to manage resistance and can increase toxicity through synergistic acti... (Complete abstract electronic access below)
Doutor
Powell, Rebecca. „Synaptotoxicité dans la maladie d'Alzheimer : Influence du processing d'APP sur les synapses excitatrices Involvement of CRF2 signaling in enterocyte Differentiation“. Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAV051.
Der volle Inhalt der QuelleAlzheimer’s disease (AD) is defined as a neurodegenerative disorder where synaptic defects lead to neuronal loss and concurrent memory impairments. It is now well-established that synaptic dysfunction in AD is initiated by oligomeric forms of the amyloid-β peptide (Aβ), a proteolytic derivative of Amyloid Precursor Protein (APP). However, the pathway by which Aβ induces its deleterious effects, whether it is due to intra- and/or extracellular Aβ pools, and how these effects are sustained and propagated throughout the brain, are still unclear.In this study, we used several mutated forms of APP which give rise to Aβ peptides with unique molecular signatures, such as: the Swedish mutation (K670M/N671L) (APPswe) which increases secreted (extracellular) Aβ; the Osaka mutation (E693Δ) (APPosa) which causes intraneuronal (intracellular) accumulation of Aβ; and the Icelandic mutation (A673T) (APPice) which has been reported to decrease Aβ production and protect against AD. These mutated forms of APP were overexpressed in cultured mouse cortical neurons in order to: i) study the morphology and function of dendritic spines, the post-synaptic element of synapses, by confocal microscopy, ii) get a better insight into pathology development and propagation and iii) identify a novel interacting partner bringing to light the possible physiologic role of Aβ in neurons.We report that pathological Aβ accumulation, due to APPwt, APPswe and APPosa overexpression but not APPice overexpression induces a significant decrease in spine density especially mushroom spines, accompanied by a significantly increased volume of the remaining mushroom spines, and that intracellular Aβ is sufficient to induce these effects. These enlarged mushroom spines have impaired structural plasticity as they did not increase in volume following synaptic activation seemingly as a result of defective activity-dependent actin dynamics in the spines. This alteration of synaptic morphology, structure and plasticity seems to be due to a newly-identified interaction between actin and Aβ, hinting a possible physiological role for Aβ in activity-dependent synaptic plasticity. We also show that synaptic activity modulates amyloïdogenic APP processing which, in pathological conditions, further exacerbates these synaptic defects. Furthermore, we show that Aβ sequence is as important as Aβ concentration in inducing synaptic alterations since pathological concentrations of Aβ harbouring the Icelandic mutation had no effect on spine density or volume. Lastly, we bring to light that secreted Aβ, not only affects the Aβ-secreting neuron itself, but also affects spine density of nearby neurons in an APP-dependent manner, reminiscent of a prion-like mechanism. Together these results demonstrate that APP processing is a finely tuned equilibrium involved in actin-remodelling during activity-dependent synaptic plasticity and opens a new route for AD therapeutic strategies
持田, 悟. „DNA損傷チェックポイントの二つのキナーゼと相互作用するCrb2の研究“. 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147896.
Der volle Inhalt der QuelleRegnat, Alexander [Verfasser], Christian [Akademischer Betreuer] Pfleiderer, Christian [Gutachter] Pfleiderer und Christian [Gutachter] Back. „Low-temperature properties and magnetic structure of CrB2, MnB2, and CuMnSb / Alexander Regnat ; Gutachter: Christian Pfleiderer, Christian Back ; Betreuer: Christian Pfleiderer“. München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1214368506/34.
Der volle Inhalt der QuelleSpinieli, Richard Leandro. „Avaliação do envolvimento de receptores específicos para o fator liberador de corticotropina CRF1 e CRF2 dos núcleos basolateral e central da amígdala no comportamento de imobilidade tônica em cobaias (Cavia porcellus)“. Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/59/59134/tde-26062014-140049/.
Der volle Inhalt der QuelleThe tonic immobility response (TI ) occurs in inescapable situations of intense danger, such as the predator attack. This response is characterized by loss of righting reflex and the relative lack of responsiveness to environmental stimuli. Consistent studies have demonstrated the involvement of different brain areas to modulate this defensive behavior, including the periaqueductal gray matter, hypothalamus and amygdala. Whereas the amygdala in particular, studies have shown the involvement of receptors for corticotropin-releasing factor (CRF) of the central (CeA) and basolateral (BLA) nuclei os amygdala in TI modulating in guinea pigs. Indeed, in recent decades, several evidences suggest that CRF is closely correlated with emotional behavior associated with fear and anxiety. While it is clear the involvement of CRF receptors in the modulation of fear, and specifically in the modulation of TI, it is still unclear the involvement of different subtypes of CRF receptors in the emotional modulation. Thus, the aim of this study was to investigate the involvement of specific receptors for corticotropin-releasing factor, CRF1 and CRF2of BLA and of CeA in modulating the TI response in guinea pigs. To achieve these objectives, independent groups of guinea pigs were implanted with guide cannulae aimed for BLA or CeA were evaluated in the test of tonic immobility before and after the administration of specific antagonists of CRF1 receptors (CP- 376395) or CRF2 receptors (Astressin 2B), or after the administration of CRF preceded by CRF1or CRF2 antagonists, or CRF per se. In addition, to assess whether the drugs used altered locomotor activity, the open field test, for 5 minutes was performed after administration of antagonists for CRF1 receptors (CP- 376395) and CRF2 (Astressin 2B), at doses that alter the TI response in guinea pigs, and the CRF agonist preceded by CRF1 or CRF2. These results show that blockade of CRF1 and CRF2 receptors in the BLA and CeA reduced the duration of the defensive response of tonic immobility (TI) in guinea pigs. In contrast, activation of these receptors in the BLA and CeA increased the TI duration, demonstrated by administration of CRF in these amygdaloid regions. Also, specific antagonists for CRF1 and CRF2 receptors were able to block the increase in the TI response induced by CRF administered in the same structure. These results suggest that the effect promoted by CRF in the BLA and CeA is by joint performance of CRF1 and CRF2 receptors. Additionally, it is important to note that the drugs, in the doses used in this study, did not promote change in the motor response, since it did not alter the activity in the open field test, which by itself could alter the TI response. Thus, it is possible to suggest that the specific blockade of CRF1 and CRF2 receptors in the BLA and CeA promote reduction of fear and/or anxiety, resulting in reduced TI response in guinea pigs.
Masilamani, Madhan. „Immunological investigation of human complement receptor type II (CR2/CD21) : serum soluble CD21 in health and disease /“. Konstanz, 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967076668.
Der volle Inhalt der QuelleCruickshank, Mark. „Analysis of CR2/CD21 transcriptional regulation by chromatin structural variation and notch activity in human cell models“. University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0115.
Der volle Inhalt der QuelleMåssebäck, Simon. „A comparison of the IRB approach and the Standard Approach under CRR for purchased defaulted retail exposures“. Thesis, KTH, Matematisk statistik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150546.
Der volle Inhalt der QuelleVi undersöker under vilka omständigheter Internmetoden enligt Förordning (EU) nr 575/2013 (tillsynsförordningen) ger ett lägre kapitalkrav för förvärvade fallerande hushållsexponeringar än Schablonmetoden enligt samma förordning. Vi diskuterar också några alternativa metoder för att beräkna kapitalkravet för de nämnda exponeringarna. Resultaten visar att det bara är fördelaktigt i ett fåtal fall att använda Internmetoden jämfört med Schablonmetoden. Vi kan också se att Internmetoden ger ett kapitalkrav i vissa fall som tydligt inte återspeglar den faktiska risken. Av de alternativa metoder som undersökts ser en Value-at-Risk-metod mest lovande ut för fortsatt utveckling.
Thorel, Nathalie. „Rôle du complément dans la réaction inflammatoire gliale : contribution à l'étude du CR2/CD21 et du GPR176“. Rouen, 2009. http://www.theses.fr/2009ROUES041.
Der volle Inhalt der QuelleIn order to decipher the function of anaphylatoxins in the central nervous system, we stimulated glioblastomas cells with C3a which leads us to the discovery of two molecules induced by C3a. CR2 is expressed on astrocytes but its function is unknown. We produced a monoclonal antibody which can activate astrocytic CR2 which translocates with TAPA-1 and with the non-muscle caldesmon. These proteins are known to arrest cell migration. In a second part, we study the GPR176 whose ligand is unknown. We immunized rabbits and mice with four protocols but we failed to obtain an antibody. We localized GPR176 in the central nervous system and particularly in the lombar spinal cord and in locus coeruleus. We produced a stable cell line which will be used in ligand finding. These results don't show an interaction between the complex TAPA-1/CR2 and GPR176 with glial inflammation but findings obtained with CR2 suppose a role of this receptor in promoting glial scar formation
Rouibi, Khalil Adnane. „Dépendance aux drogues opiacées : focus sur le système corticotropin-releasing factor“. Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14434/document.
Der volle Inhalt der QuelleOpiate illicit use represents one of the most severe sanitary problems throughout the world. Among humans, the emergence of the opiate withdrawal (OW) syndrome after cessation of opiate intake is considered as one of the key motivational elements that lead to the vulnerability to opiates relapse. Therefore, the OW is characterized by a various alterations of the behavioral and neurobiological homeostasis responses to stress which are determinants in opiate dependence. The Corticotropin-releasing factor (CRF) system is the major coordinator of stress-responsive circuitry. Through its two receptors CRF1 and CRF2, the CRF system has recently emerged as major contributor in the development of components of the OW syndrome. The aim of this thesis is to determine the role of CRF2 receptor in the negative affective states and motivational disorders implicated in opiate relapse during OW.Behavioral and biological experiments were conducted in CRF2 receptor-deficient mice (CRF2-/-). We reported that genetic deletion of the CRF2 receptor eliminates dysphoria and molecular alterations elicited by OW without impairing brain, neuroendocrine and autonomic stress-coping responses to withdrawal. Using behavioral approaches of operant responding to highly palatable food (HPF) we found that CRF2-/- reduces motivational disorders induced by intermittent morphine injections and withdrawal. Finally, we described a mouse model of stress-induced food reinstatement seeking behavior during prolonged OW. Furthermore, we reported a gender dimorphism in the role of the CRF2 receptor in the stress-induced reinstatement of HPF seeking behavior long-lasing after opiate treatment.These findings underscore the importance of CRF2 receptor as possible effective treatment of the critical problem of opiate dependence
Vivet, Nicolas. „Elaboration et caractérisation de films minces Cr2+:ZnSe nanostructurés pour la fabrication de microlasers émettant dans le moyen infrarouge“. Phd thesis, Université de Caen, 2008. http://tel.archives-ouvertes.fr/tel-00347093.
Der volle Inhalt der QuelleDans l'objectif de développer un laser compact pompé électriquement, des films minces de Cr2+:ZnSe ont été élaborés à température ambiante par pulvérisation magnétron radiofréquence d'une cible de SiO2 recouverte de morceaux de ZnSe et de chrome sous plasma d'argon pur, sur des substrats de verre, Si et GaAs.
Quelque soit le substrat, les films déposés sont constitués de ZnSe cubique quasi-stoechiométrique et présentent une structure colonnaire avec une forte orientation préférentielle dans la direction 111. Le recours à l'analyse combinée par diffraction X a permis de résoudre simultanément la texture, la structure et la microstructure d'un des films déposés. Le spectre de PL des films à température ambiante dans le domaine 2-3 µm, comparable à celui des cristaux de référence de Cr2+ :ZnSe, a été obtenu d'une part par excitation directe des ions Cr2+ (1.85 µm) et d'autre part par excitation indirecte en utilisant un laser visible. Les paramètres de dépôt (puissance radiofréquence, pression d'argon, quantité de chrome) ont été optimisés pour obtenir des films présentant une intensité de PL maximum dans le MIR.
MOUHOUB, AMAL. „Expression et fonction des recepteurs du complement cr1/cd35 et cr2/cd21 au cours de la maturation des lymphocytes t chez l'homme. Role de cr1 et cr2 dans l'induction de la replication virale dans les thymocytes et les lymphocytes t infectes par le vih“. Paris 11, 1996. http://www.theses.fr/1996PA112334.
Der volle Inhalt der QuelleMorisot, Nadège. „La délétion génétique du récepteur corticotropin-releasing factor de type 2 réduit les déficits mnésiques et sociaux induits par la cocaïne“. Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR15220.
Der volle Inhalt der QuelleStimulant-related disorders are characterized by emotional-like, cognitive and social dysfunction that may contribute to the maintenance of the disease. In addition, stimulant use and withdrawal may alter brain stress systems. The corticotropin-releasing factor (CRF) system is a major stress coordinator hypothesized to contribute to substance-related disorders. CRF signalling is mediated by two receptor types, named CRF1 and CRF2. The specific role of each of the CRF receptors in negative affective-like, cognitive and social dysfunction associated with stimulant administration and withdrawal remains largely unknown. The present study demonstrates that the CRF1 receptor-deficiency increases the anxiety-like behaviour induced by intermittent administration of escalating doses of cocaine (5-20 mg/kg, i.p.), as assessed by the elevated plus maze. In addition, the same cocaine regimen induces novel object recognition (NOR) and sociability deficits, which are unaffected by CRF2 receptor-deficiency. However, CRF2 receptor-deficiency effectively shortens the duration of the NOR and sociability deficit induced by cocaine withdrawal. Furthermore, following the apparent recovery of NOR and sociability performances during relative long-term (42 days) cocaine withdrawal, CRF2 receptor-deficiency eliminates the stress-induced re-emergence of NOR and sociability deficit. Stressed cocaine-withdrawn mice show a genotype-independent higher c-fos mRNA expression in the perirhinal cortex, a brain region mediating NOR performance, than stressed drug-naïve mice. However, neither genotype nor drug withdrawal affects the expression of tyrosine hydroxylase in the ventral tegmentale area and the locus coeruleus, CRF in the amygdala and the paraventricular nucleus of the hypothalamus and dynorphin in the nucleus accumbens shell. The latter results suggest that stress vulnerability during long-term cocaine withdrawal is not due to alterations in stress-coping mechanisms. The present study provides initial evidence of a critical role for the CRF system in cognitive and sociability deficits and vulnerability induced by stimulant administration and withdrawal, suggesting new therapeutic strategies for substance-related disorders
Souza, Priscila Queiroz Pires de. „Relógios biológicos e padrões de alimentação em camundongos normais e com sobrepeso“. Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3472.
Der volle Inhalt der QuelleA saudável interação entre o indivíduo e o meio depende do alinhamento entre a dinâmica fisiológica do primeiro e os periódicos movimentos da natureza. A interação entre tais ritmos por sua vez constitui-se em base e derivação do processo de evolução. O comprometimento de tal alinhamento representa um risco para a sobrevivência das espécies. Neste contexto, os organismos alinham seus ritmos fisiológicos a diferentes ciclos externos. Desta forma, ciclos endógenos são coordenados por relógios biológicos que determinam em nosso organismo, específicos ritmos em fase com a natureza, tais como ritmos circadianos (RC), cujo período aproxima-se de 24 horas. O peso corporal, a ingestão de alimentos e o consumo de energia são processos caracterizados pelo RC e a obesidade está associada a uma dessincronização deste processo. A modulação do RC é resultado da expressão dos clock gens CLOCK e BMAL1 que formam um heterodímero responsável pela transcrição gênica de Per1, Per2, Per3, Cry1 e Cry2. As proteínas codificadas por estes genes, uma vez sintetizadas, formam dímeros (PER-CRY) no citoplasma que, a partir de determinada concentração, retornam ao núcleo, bloqueando a ação do heterodímero CLOCK/BMAL1 na transcrição dos próprios genes, formando assim uma alça de retroalimentação negativa de transcrição e tradução. Estes genes asseguram a periodicidade e são significativamente expressos no núcleo supraquiasmático (SCN) do hipotálamo. Para estudar esse processo em camundongos normais e hiperalimentados, saciados e em estado de fome, foi utilizado um método de registro do comportamento alimentar baseado no som produzido pela alimentação dos animais, e a correlação destes estados metabólicos com a expressão de CLOCK, BMAL1, Per1, Per2, Per3, bem como das proteínas Cry1 e Cry2 no SCN, por análise de imagens obtidas em microscopia confocal. Camundongos suíços controle em estado de fome (CF) e saciados (CS) foram comparados com animais hiperalimentados com fome (HF) e saciados (HS). Nenhum grupo demonstrou diferença nos conteúdos CLOCK e BMAL1, indicando capacidade potencial para modular os ritmos biológicos. No entanto, as proteínas Per1, Per2, Per3 e Cry1 apresentaram menor expressão no grupo CS, mostrando uma diferença significativa quando comparados com o grupo CF (P<0,05), diferença esta não encontrada na comparação entre os grupos HF e HS. A quantidade de proteína Cry2 não foi diferente na mesma comparação. Os resultados do estudo indicaram que as alterações dos ritmos endógenos e exógenos, refletido pelo comportamento hiperfágico observado em camundongos hiperalimentados, pode ser devido a um defeito no mecanismo de feedback negativo associado ao dímero Cry-Per, que não bloqueia a transcrição de Per1 Per2, Per3 e Cry1 pelo heterodímero CLOCK-BMAL1.
The healthy interaction between the subject and the environment depends on the alignment between the physiological dynamics of the first one and the periodical movements of nature. The interaction between these rhythms in turn is based on the derivation and evolution process. The involvement of such an alignment is a risk to the survival of species. In this context the bodies line up their physiological rhythms to different external cycles. Thus, endogenous cycles are coordinated by biological clocks which determine in our organism specific rhythms in phase with the nature, such as Circadian Rhythms (CR) whose period is close to 24 hours. The body weight, the food intake and the energy consumption are processes characterized by the CR and the obesity is associated with a different timing of this process. The CR modulation is a result of the formulation of clock-gens CLOCK and BMAL1 who form an heterodimer responsible for the gene transcription of Per1, Per2, Per3, Cry1 e Cry2. The proteins encoded by these genes, once synthesized, form dimers (PER-CRY) in the cytoplasm that, depending on a given concentration, return to the core blocking the action of the CLOCK/BMAL1 heterodimer in the transcription of its own genes, thus forming a negative feedback loop of transcription and translation. These genes secure the periodicity and are significantly expressed in the hypothalamus suprachiasmatic nucleus. In order to study this process in regular, hyper-fed, hungry and satiated mice, we used a registration method of feeding behavior based on the sound produced by animal feeding and the relation between the metabolic states with the expression CLOCK, BMAL1, Per1, Per2, Per3, as well as the Cry1 and Cry2 proteins in the SCN, by analysis of images obtained in confocal microscopy. Control Swiss mice in state of hunger/ satiated were compared to hyper-fed animals in the same conditions. None of them showed difference in the CLOCK and BMAL1 contents, showing a potential capacity to modulate the biological rhythms. However, the Per1, Per2, Per3 and Cry1 proteins showed a minor expression in the CS group and a significant difference when compared to the CF group (P<0,05). This difference cant be found in the HF and HS groups. The results of the studies indicated that the endogenous and exogenous changes, reflected by the hyperphagic behavior observed in hyper-fed mice, may be due to a defect in the mechanism of negative feedback associated to the Cry-Per dimer, which has abolished the blocking mechanism of Per1 Per2, Per3 and Cry1 by the CLOCK-BMAL1 heterodimer.
Penkhues, Manfred. „Fulvenkomplexe des Typs Cp2Zr(j6-C5H4=CR2) [Cp 2 Zr (eta 6 C 5 H 4 CR 2)] neuartige Elektronenüberschussverbindungen /“. [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962077038.
Der volle Inhalt der QuelleDELIBRIAS, CATHERINE. „Etude phenotypique et fonctionnelle des recepteurs pour les fragments de c3, cr1 (cd35) et cr2 (cd21), des lymphocytes t humains“. Paris 7, 1993. http://www.theses.fr/1993PA077245.
Der volle Inhalt der QuelleKolarz, Adam [Verfasser], Wolfgang [Akademischer Betreuer] [Gutachter] Wurst und Carsten T. [Gutachter] Wotjak. „Genetically dissecting the role of CRHR2 and UCN2 in the control of emotional behavior / Adam Kolarz. Betreuer: Wolfgang Wurst. Gutachter: Wolfgang Wurst ; Carsten T. Wotjak“. München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1107543509/34.
Der volle Inhalt der QuelleLabeur, Carole. „Intégration de signaux peptidiques et hormonaux régulant l’architecture du système racinaire des légumineuses Different Pathways Act Downstream of the CEP Peptide Receptor CRA2 to Regulate Lateral Root and Nodule Development Independent Regulation of Symbiotic Nodulation by the SUNN Negative and CRA2 Positive Systemic Pathways The NIN transcription factor coordinates CEP and CLE signaling peptides that regulate nodulation antagonistically“. Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASB009.
Der volle Inhalt der QuelleLegumes adapt their root architecture to environmental conditions by modifying the growth and number of their lateral roots, but also by developing nitrogen-fixing nodules in nitrogen-deficient conditions and in the presence of symbiotic bacteria (rhizobia). Systemic regulatory pathways involving signaling peptides perceived by receptors kinase allow the coordination of the development of these root organs according to the availability of nitrogen in the soil and the needs of the plant. The objectives of this thesis were, on the one hand, to identify which peptide signal acts via one of these receptors, namely CRA2, to induce nodulation and suppress the formation of lateral roots; and secondly to determine how this pathway integrates with other signaling pathways regulating the root architecture, ie (i) the systemic pathway involving CLE signaling peptides and the SUNN receptor negatively regulating nodulation and (ii) the pathway of cytokinin phytohormones regulating root architecture similarly to CRA2. We have shown that the CRA2 receptor is required for the action of the signaling peptide MtCEP1, and that the two systemic pathways antagonistically regulating nodulation act independently. Finally, we have shown that the MtCEP7 gene, induced by rhizobium and cytokinins, promotes rhizobial infections, and its production is coordinated with that of a CLE peptide that negatively regulates nodulation, via cytokinins and the NIN transcription factor
GRENON, MURIEL. „Analyse genetique et moleculaire des genes chk1#+ et crb2#+ impliques dans les voies de surveillance de la reparation et de la replication de l'adn chez schizosaccharomyces pombe“. Paris 11, 1998. http://www.theses.fr/1998PA112385.
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