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Academic literature on the topic 'Ségrégation ADN'
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Journal articles on the topic "Ségrégation ADN"
Degenne, Alain, Monique Pinçon-Charlot, Edmond Préteceille, Paul Rendu, Monique Pincon-Charlot, and Edmond Preteceille. "Ségrégation urbaine." Revue Française de Sociologie 28, no. 3 (July 1987): 545. http://dx.doi.org/10.2307/3321729.
Full textJaglin, Sylvy. "Villes disloquées? Ségrégations et fragmentation urbaine en Afrique australe//Broken-up cities: ségrégation and urban fragmentation in Southern Africa." Annales de Géographie 110, no. 619 (2001): 243–65. http://dx.doi.org/10.3406/geo.2001.2034.
Full textPan Ké Shon, Jean-Louis. "Ségrégation ethnique et ségrégation sociale en quartiers sensibles." Revue française de sociologie 50, no. 3 (2009): 451. http://dx.doi.org/10.3917/rfs.503.0451.
Full textBoutchénik, Béatrice, Pauline Givord, and Olivier Monso. "Ségrégation urbaine et choix du collège : quelles contributions à la ségrégation scolaire ?" Revue économique Vol. 72, no. 5 (September 9, 2021): 717–47. http://dx.doi.org/10.3917/reco.725.0717.
Full textFusco, Giovanni, and Floriane Scarella. "Métropolisation et ségrégation sociospatiale." Espace géographique 40, no. 4 (2011): 319. http://dx.doi.org/10.3917/eg.404.0319.
Full textMaloutas, Thomas. "La ségrégation sociale à Athènes." Mappemonde 48, no. 4 (1997): 1–4. http://dx.doi.org/10.3406/mappe.1997.2252.
Full textCastro, Roland. "La rue et la ségrégation sociale." Pouvoirs 116, no. 1 (2006): 111. http://dx.doi.org/10.3917/pouv.116.0111.
Full textPontikis, V. "Études numériques de la ségrégation interfaciale." Le Journal de Physique IV 09, PR4 (April 1999): Pr4–29—Pr4–37. http://dx.doi.org/10.1051/jp4:1999404.
Full textSaindrenan, G. "Ségrégation et restauration des structures écrouies." Le Journal de Physique IV 09, PR4 (April 1999): Pr4–81—Pr4–86. http://dx.doi.org/10.1051/jp4:1999411.
Full textBernardini, J. "Ségrégation intergranulaire et transport de matière." Le Journal de Physique IV 09, PR4 (April 1999): Pr4–155—Pr4–163. http://dx.doi.org/10.1051/jp4:1999420.
Full textDissertations / Theses on the topic "Ségrégation ADN"
Quebre, Valentin. "Etude des complexes ADN-protéines impliqués dans la ségrégation de l'ADN bactérien." Thesis, Toulouse 3, 2022. http://www.theses.fr/2022TOU30072.
Full textBacterial chromosomes and low copy number plasmids segregation is based on an active positioning mechanism. It consists in the partition systems that ensures the proper intracellular positioning of replicons to be faithfully transmitted to the daughter cells. The partition systems involves three cis-encoded partners. A DNA binding protein (ParB), is assembled in partition complexes at centromeric sequences (parS). An NTPase, which interacts with the partition complex, drives the segregation process and allows the complexes, and thus the plasmids, to be properly positioned inside the cell. My Ph.D project focused first on the better understanding of the partition complex assembly of the widespread type I system of the F plasmid and pESBL. Then, to decipher the global mechanism of the partition process of the recently discovered atypical system on R388, which does not involve any plasmid encoded NTPase to ensure its intracellular positioning. Thus, my project is divided in three parts, aiming to (i) understand by an mutational approach, the initiation mechanism for the self-assembly of the majority of F plasmid ParB in a dynamic high molecular weight complex around parS, (ii) identify the pESBL partition system partners, in vitro characterize the ParB/parS interaction profile and in silico determine the group to which it belongs, (iii) identify the roles of the different domains of the R388 DNA binding protein StbA in its activities and characterize the StbA interaction modalities on its centromere by high throughput sequencing and biochemical approaches, to understand the partition complex architecture. This study allows us to improve our knowledge on the Type I partition system and to shed light on the DNA/protein interaction specificities of an atypical system, carried by broad-host-range plasmids, opening the way to a better understanding of DNA segregation mechanism
Wallet, Clementine. "L'hélicase RECG1, un facteur-clé dans le maintien et la ségrégation de l'ADN mitochondrial d'Arabidopsis thaliana." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAJ016/document.
Full textThe mitochondrial DNA (mtDNA) of flowering plants is characterized by the recombination activities that modulate its structure. These activities are required for the mtDNA maintenance, and drive its rapid structural evolution. The factors that control recombination are therefore essential for plant mtDNA stability. During my PhD, I identified and characterized two DNA helicases that are present in the organelles of Arabidopsisthaliana. One is the homologue of a bacterial helicase involved in transcription-coupled repair. Its role in the plant organelles is still not determined. The other one, the RECG1 helicase, has roles in recombination dependent repair, the surveillance of ectopic recombination involving short repeated sequences, and also the segregation of the mtDNA. We have found that in the absence of RECG1 there is loss of recombination control resulting in the occurrence of alternative versions of the mtDNA generated by recombination. The analysis oftheir segregation, induced by RECG1, allowed us to build a model to how new stable mtDNA configurations are generated by the stoichiometric shift of mtDNA sub-genomes. This work allowed us to better understand the recombination and segregation mechanisms that modulate the Arabidopsis mtDNA
Castaing, Jean-Philippe. "La ségrégation du plasmide F d'Escherichia coli : étude du rôle de la fixation de l'ATPase Sopa à l'ADN." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/597/.
Full textThe segregation of the DNA, also called partition for procaryotes, is the process allowing any organisms to transmit its genetic heritage to next generation. In bacteria, mitotic stability of plasmids and many chromosomes depends on replicon-specific systems which comprise a centromere, a centromere-binding protein and an ATPase. We have taken as a model, the low-copy number plasmid F of Escherichia coli. Centromere-binding protein SopB binds to sopC centromere and forms the partition complex. This nucleoproteic complex is recognized by the SopA "Walker-box" ATPase. SopA shares with other partition ATPase the capacity of self assembly in presence of ATP. This dynamic self-assembly would allow active partition during bacterial division. Previous work in our team showed SopA is also able to bind to non specific DNA in an ATP-dependant manner whereby polymerization is inhibited. Indeed, DNA inhibited this polymerization and cause breakdown of pre-formed polymers. SopB counteracted this DNA effect by binding itself to and masking DNA. We had proposed a model in which the polymerization is spacially regulated. Nucleoid DNA prevent inappropriate SopA polymerization but when SopB is present in high concentration, it create a DNA-depleted zone within SopA can initiate polymerization. The regulation of the dynamic behaviour of the "driving" protein of the system would be necessary for the process of partition. To support our model, we looked for a DNA binding domain in SopA. We have found a SopA mutant, defective for ATP dependent DNA binding. Only the activities of SopA dependent on this binding were affected: the inhibition of the polymerisation is abolished, as the stimulation of the ATPase activity and the intracellular localization. Moreover, this mutant is defective for plasmid stabilization. This last result confirms the implication of the nucleoïd DNA in regulation of the dynamic behavior of SopA, which is necessary for the partition of the plasmide F
Maguin, Emmanuelle. "Étude des inhibitions de division associées à l'arrêt de réplication de l'ADN et de la ségrégation des nucléoïdes chez Escherichia coli." Paris 11, 1987. http://www.theses.fr/1987PA112292.
Full textStouf, Mathieu. "Étude de la ségrégation de la région terminale du chromosome d'Escherichia coli." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2129/.
Full textBacteria use the replication origin-to-terminus polarity of their circular chromosomes to control DNA transactions during the cell cycle. Segregation starts by active migration of the region of origin followed by progressive movement of the rest of the chromosomes. The last steps of segregation have been studied extensively in the case of dimeric sister chromosomes and when chromosome organization is impaired by mutations. In these special cases, the divisome-associated DNA translocase FtsK is required. FtsK pumps chromosomes toward the dif chromosome dimer resolution site using polarity of the FtsK-orienting polar sequence (KOPS) DNA motifs. Assays based on monitoring dif recombination have suggested that FtsK acts only in these special cases and does not act on monomeric chromosomes. Using a two-color system to visualize pairs of chromosome loci in living cells, we show that the spatial resolution of sister loci is accurately ordered from the point of origin to the dif site. Furthermore, ordered segregation in a region ~200 kb long surrounding dif depended on the oriented translocation activity of FtsK but not on the formation of dimers or their resolution. FtsK-mediated segregation required the MatP protein, which delays segregation of the dif-surrounding region until cell division. We conclude that FtsK segregates the terminus region of sister chromosomes whether they are monomeric or dimeric and does so in an accurate and ordered manner. Our data are consistent with a model in which FtsK acts to release the MatP-mediated cohesion and/or interaction with the division apparatus of the terminus region in a KOPS-oriented manner
Steffann, Julie. "Etude de la ségrégation de l'ADN mitochondrial au cours du développement embryofoetal humain." Paris 5, 2006. http://www.theses.fr/2006PA05N17S.
Full textInherited disorders resulting from mutations of mitochondrial DNA (mtDNA) are serious diseases with a high recurrence risk due to their maternal mode of inheritance. Variability in clinical severity and various multi-tissual involvement result in a large extent from the coexistence of wild-type and mutant mtDNA molecules in various proportions in different tissues (heteroplasmy). Uncertainties regarding the potential variation of heteroplasmy load during human embryofetal development had hampered the development of prenatal (PND) and preimplantation (PGD) diagnostic procedures. Moreover, the restriction of the mtDNA molecule number, through a putative bottleneck at the time of
Lesterlin, Christian. "Rôles de l'organisation en réplichores et en macrodomaines dans la ségrégation du chromosome d'Escherichia coli." Toulouse 3, 2005. http://www.theses.fr/2005TOU30119.
Full textRecent work has highlighted two main levels of global organisation of the E. Coli chromosomes. Macrodomains are large domains inferred from structural data consisting of loci displaying the same intracellular positioning. Replichores, defined by base composition skews, coincide with the replication arms in normal cells. We used chromosome inversions to show that the dif site, which resolves chromosome dimers, only functions when located at the junction of the replichores, whatever their size. This thesis is the first evidence that replichore polarisation has a role in chromosome segregation. We also show that disruption of the Ter macrodomain provokes a cell cycle defect independent from dimer resolution. This confirms the existence of the Ter macrodomain and suggests a role in chromosome dynamics
Devigne, Alice. "PprA : une protéine clé dans la radiorésistance chez Deinococcus radiodurans." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS056/document.
Full textDeinococcus radiodurans, one of the most radioresistant organisms known to date is able to reconstruct an intact genome from hundreds of DNA fragments generated by γ-rays. More generally, this bacterium is also tolerant to other DNA-damaging agents. This exceptional ability to overcome effects of ionizing radiations is due to a combination of several well regulated mechanisms and factors acting together when cells are exposed the radiations. Among these factors, some specific proteins of the Deinococcaceae family which are induced after irradiation can be observed. The PprA protein is one of these specific proteins and has been shown to have an important role in radioresistance in D. radiodurans. This protein is one of the most induced after γ-rays treatment. None homologous protein have been identify for the PprA protein. Characteristics of the ΔpprA mutant were investigated in order to understand the involvement of PprA in radioresistance. This mutant is very sensitive to γ-rays and other DNA damaging agents as nalidixic acid or novobiocin. Phenotypic analyses of this mutant revealed that PprA protein seems to be implicated in chromosome segregation after irradiation when DNA is repaired in cells. Moreover, the PprA protein has been shown to interact in vivo with DNA gyrase after irradiation and to stimulate in vitro the decatenation activity of DNA gyrase, without affecting its DNA negative supercoiling activity. Phenotypes previously observed also suggest a potential interaction between the PprA protein and the protein SMC family which are SMC, SbcC and RecN in D. radiodurans. Surprisingly, we found that disrupting recN gene in a ΔpprA strain abolish the sensitivity to DNA damaging agents observed in a ΔpprA strain. These results suggest that the two genes, pprA and recN interact but the accurate link between the two proteins PprA and RecN remains to be highlighted
Bigot, Sarah. "Trafic de l'ADN dans la bactérie : rôles de l'ADN translocase FtsK d'Escherichia coli." Toulouse 3, 2006. http://www.theses.fr/2006TOU30105.
Full textIn Escherichia coli, the ATP-dependent DNA translocase FtsK transports DNA across the site of cell division and activates recombination by the XerCD recombinases at a specific site on the E. Coli chromosome, dif, to ensure the equal distribution of the genetic material and the topological integrity of daughter chromosomes during the last stages of chromosome segregation. We showed that DNA mobilization and Xer recombination activation, two functions required to resolve dimers, are genetically separable. We have also shown that DNA transport by FtsK is oriented by 8 bp asymmetric sequences (“KOPS”) displaying a biased orientation and distribution on the E. Coli chromosome and that KOPS promote FtsK loading on DNA and that translocation is oriented at this step
Passot, Fanny. "Rôle et spécificité d'interaction des systèmes parABS de Burkholderia cenocepacia, bactérie multi-chromosomique." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1384/.
Full textWe are working on B. Cenocepacia J2315 (Bcen), which genome is divided into 3 chromosomes (c1, c2, c3) and 1 plasmid (pBC), each carrying a parABS system, homologs of known plasmid segregation systems. By studying deletions of the parAB operons and excess of parS sites, I proved that parABS systems are important for fitness. More specifically, the analysis of the replicon origin localizations indicates that these systems are implied in the segregation of their own replicons. To avoid incompatibility, the 4 parABS systems must avoid cross-interactions. This is achieved by a stringent ParB-parS interaction, as shown by lack of recognition of mutant parSc1 or parSc3 in toxicity tests in Bcen. Identification and analysis of a group of related parABS, exclusive of the secondary replicons of the Burkholderiales, allowed us to identify a pHTH domain implied in ParB binding on parS, and to reveal that compatibility drives a diversifying evolution of the parABS systems
Books on the topic "Ségrégation ADN"
Laforgue, Denis. La ségrégation scolaire, l'État face à ses contradictions. Paris: Harmattan, 2005.
Find full textDeschamps, Emmanuelle. Le droit public et la ségrégation urbaine (1943-1997). Paris: Librairie générale de droit et de jurisprudence, 1998.
Find full textLa Martinique napoléonienne, 1802-1809: Entre ségrégation, esclavage et intégration. Paris: SPM, 2014.
Find full textZanten, Agnès Henriot-van. L' école de la périphérie: Scolarité et ségrégation en banlieue. Paris: Presses universitaires de France, 2001.
Find full textMoulin, Brigitte. La ville et ses frontières: De la ségrégation sociale à l'ethnicisation des rapports sociaux. Paris: Karthala, 2001.
Find full textRéseau Socio-Economie de l'habitat (France). Réhabilitation et embourgeoisement des quartiers anciens centraux: Étude des formes et des processus de micro-ségrégation dans le quartier Saint-Georges à Lyon. Paris: Plan construction et architecture, 1997.
Find full text1924-, Ferguson Clarence Clyde, ed. Desegregation and the law: The meaning and effect of the school segregation cases. Littleton, Colo: F.B. Rothman, 1985.
Find full textRabinowitz, Howard N. Race relations in the urban South, 1865-1890. Athens: University of Georgia Press, 1996.
Find full textTushnet, Mark V. The NAACP's legal strategy against segregated education, 1925-1950. Chapel Hill: University of North Carolina Press, 2004.
Find full textThe NAACP's legal strategy against segregated education, 1925-1950. Chapel Hill: University of North Carolina Press, 1987.
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