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Search Results: 1 - 10 of 1393 matches for " Sylvie Jolivet "
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Turning Meiosis into Mitosis
Isabelle d'Erfurth,Sylvie Jolivet,Nicole Froger,Olivier Catrice,Maria Novatchkova,Rapha?l Mercier
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.1000124
Abstract: Apomixis, or asexual clonal reproduction through seeds, is of immense interest due to its potential application in agriculture. One key element of apomixis is apomeiosis, a deregulation of meiosis that results in a mitotic-like division. We isolated and characterised a novel gene that is directly involved in controlling entry into the second meiotic division. By combining a mutation in this gene with two others that affect key meiotic processes, we created a genotype called MiMe in which meiosis is totally replaced by mitosis. The obtained plants produce functional diploid gametes that are genetically identical to their mother. The creation of the MiMe genotype and apomeiosis phenotype is an important step towards understanding and engineering apomixis.
Turning Meiosis into Mitosis
Isabelle d'Erfurth,Sylvie Jolivet,Nicole Froger,Olivier Catrice,Maria Novatchkova,Rapha?l Mercier
PLOS Biology , 2009, DOI: 10.1371/journal.pbio.1000124
Abstract: Apomixis, or asexual clonal reproduction through seeds, is of immense interest due to its potential application in agriculture. One key element of apomixis is apomeiosis, a deregulation of meiosis that results in a mitotic-like division. We isolated and characterised a novel gene that is directly involved in controlling entry into the second meiotic division. By combining a mutation in this gene with two others that affect key meiotic processes, we created a genotype called MiMe in which meiosis is totally replaced by mitosis. The obtained plants produce functional diploid gametes that are genetically identical to their mother. The creation of the MiMe genotype and apomeiosis phenotype is an important step towards understanding and engineering apomixis.
Low occurrence of Pseudomonas aeruginosa in agricultural soils with and without organic amendment
Sylvie Nazaret,Amelie Deredjian,Samuel Dequiedt,Alain Hartmann,Elisabeth BROTHIER,Benjamin Youenou,Claudy Jolivet
Frontiers in Cellular and Infection Microbiology , 2014, DOI: 10.3389/fcimb.2014.00053
Abstract: The occurrence of Pseudomonas aeruginosa was monitored at a broad spatial scale in French agricultural soils, from various soil types and under various land uses to evaluate the ability of soil to be a natural habitat for that species. To appreciate the impact of agricultural practices on the potential dispersion of P. aeruginosa, we further investigated the impact of organic amendment at experimental sites in France and Burkina Faso. A real-time quantitative PCR (qPCR) approach was used to analyze a set of 380 samples selected within the French RMQS (‘Réseau de Mesures de la Qualité des Sols’) soil library. In parallel, a culture-dependent approach was tested on a subset of samples. The results showed that P. aeruginosa was very rarely detected suggesting a sporadic presence of this bacterium in soils from France and Burkina Faso, whatever the structural and physico-chemical characteristics or climate. When we analyzed the impact of organic amendment on the prevalence of P. aeruginosa, we found that even if it was detectable in various manures (at levels from 103 to 105 CFU or DNA targets (g drywt)-1 of sample), it was hardly ever detected in the corresponding soils, which raises questions about its survival. The only case reports were from a vineyard soil amended with a compost of mushroom manure in Burgundy, and a few samples from two fields amended with raw urban wastes in the sub-urban area of Ouagadougou, Burkina Faso. In these soils the levels of culturable cells were below 10 CFU (g drywt)-1.
Mutations in AtPS1 (Arabidopsis thaliana Parallel Spindle 1) Lead to the Production of Diploid Pollen Grains
Isabelle d'Erfurth,Sylvie Jolivet,Nicole Froger,Olivier Catrice,Maria Novatchkova,Mathieu Simon,Eric Jenczewski,Rapha?l Mercier
PLOS Genetics , 2008, DOI: 10.1371/journal.pgen.1000274
Abstract: Polyploidy has had a considerable impact on the evolution of many eukaryotes, especially angiosperms. Indeed, most—if not all—angiosperms have experienced at least one round of polyploidy during the course of their evolution, and many important crop plants are current polyploids. The occurrence of 2n gametes (diplogametes) in diploid populations is widely recognised as the major source of polyploid formation. However, limited information is available on the genetic control of diplogamete production. Here, we describe the isolation and characterisation of the first gene, AtPS1 (Arabidopsis thaliana Parallel Spindle 1), implicated in the formation of a high frequency of diplogametes in plants. Atps1 mutants produce diploid male spores, diploid pollen grains, and spontaneous triploid plants in the next generation. Female meiosis is not affected in the mutant. We demonstrated that abnormal spindle orientation at male meiosis II leads to diplogamete formation. Most of the parent's heterozygosity is therefore conserved in the Atps1 diploid gametes, which is a key issue for plant breeding. The AtPS1 protein is conserved throughout the plant kingdom and carries domains suggestive of a regulatory function. The isolation of a gene involved in diplogamete production opens the way for new strategies in plant breeding programmes and progress in evolutionary studies.
La notion de trajectoire en géographie, une clé pour analyser les mobilités ?
Violaine Jolivet
EchoGéo , 2008,
Abstract: Cet article se propose de présenter la notion de trajectoire qui permet de fonder une nouvelle approche des questions migratoires en géographie. A travers nos terrains nous comparons les invariants et les différences entre les deux couples migratoires majeurs de la Cara be : Les Cubains de Miami et les Ha tiens de Santo Domingo. L’idée de trajectoire permet d’aborder les mobilités en rapport avec les trois piliers qui sous-tendent notre analyse : espace, société et pouvoir. L’étude de ces deux trajectoires caribéennes permet alors de souligner l’importance des cadres géopolitiques et des discours dominants qui préexistent à l’ancrage et à l’insertion des migrants. This article explores the concept of trajectory which leads to a new approach of the migratory issues in geography. Through our field studies we look at both invariants and differences between the two major migratory groups of the Caribbean region: the Cubans of Miami and the Haitians of Santo Domingo. The concept of trajectory allows us to analyse migrations from the perspective of the three underlying issues supporting our analysis: space, society and power. The study of these two trajectories emphasizes the importance of the geopolitical framework and the dominant voices in the process of immigrant’s integration.
Extension of thickened continental crust, from brittle to ductile deformation: examples from Alpine Corsica and Aegean Sea
L. Jolivet
Annals of Geophysics , 1993, DOI: 10.4401/ag-4286
Abstract:
Pour un autre procès en cour d’assises ? L’éclairage du cas italien For another process before the cour d’assises ? In the light of the Italian example
Anne Jolivet
Droit et Cultures , 2009,
Abstract: En France, l’affaire dite d’Outreau a relancé les débats sur la nécessité d’une réforme de la procédure pénale. En Italie, le nouveau Code de procédure pénale de 1989 – entré en vigueur en 1991 – a introduit un système judiciaire à dominante accusatoire. Quelles le ons peut-on tirer de l’expérience italienne ? L’absence d’intérêt pour l’audience de cours d’assises et pour le jury criminel dans la réflexion de la commission d’enquête parlementaire, nous a amenée à présenter ces deux thèmes à la lumière de l’enseignement qu’offre le système judiciaire italien. Ce dernier nous montre l’importance de la prise en compte de la culture juridique dans tout projet de réforme, et nous met en garde contre l’ impératif réformateur , tout en offrant de nouvelles perspectives pour penser la pérennité et la fiabilité de l’institution judiciaire. In France the Outreau case has revived the discussion about the necessity of a reform of the criminal procedure. In Italy, the new criminal procedure Code adopted in 1989 – in force since 1991 – has introduced a judiciary system with an accusatory dominant. What can we learn from the Italian experience? The lack of interest for the criminal hearings in cour d’assises and for the criminal jury in the parliamentary investigation committee’s reflection has led us to present these two topics in the light of the Italian judicial system. This system shows the importance of taking into account the legal culture in any reform project and warns us against the reforming imperative , while it offers new perspectives for the durability and reliability of the judicial institution.
élaborer un vocabulaire historique du vêtement et des textiles dans le cadre d’un réseau interdisciplinaire
Sophie Jolivet
Bulletin du Centre d’études Médiévales d’Auxerre , 2011, DOI: 10.4000/cem.12033
Abstract: Le réseau Vêtement et textile : sources et ressources organise un colloque international élaborer un vocabulaire historique du vêtement et des textiles dans le cadre d’un réseau interdisciplinaire ,qui se tiendra à Dijon les 20 et 21 octobre 2011. Il réunira des membres du réseau et d’autres intervenants sur invitation et/ou appel à contribution. Pleinement interdisciplinaire, ce réseau réunit des chercheurs en histoire, histoire de l’art, archéologie, anthropologie historique, personn...
The CYCLIN-A CYCA1;2/TAM Is Required for the Meiosis I to Meiosis II Transition and Cooperates with OSD1 for the Prophase to First Meiotic Division Transition
Isabelle d'Erfurth equal contributor,Laurence Cromer equal contributor,Sylvie Jolivet,Chloé Girard,Christine Horlow,Yujin Sun,Jennifer P. C. To,Luke E. Berchowitz,Gregory P. Copenhaver,Raphael Mercier
PLOS Genetics , 2010, DOI: 10.1371/journal.pgen.1000989
Abstract: Meiosis halves the chromosome number because its two divisions follow a single round of DNA replication. This process involves two cell transitions, the transition from prophase to the first meiotic division (meiosis I) and the unique meiosis I to meiosis II transition. We show here that the A-type cyclin CYCA1;2/TAM plays a major role in both transitions in Arabidopsis. A series of tam mutants failed to enter meiosis II and thus produced diploid spores and functional diploid gametes. These diploid gametes had a recombined genotype produced through the single meiosis I division. In addition, by combining the tam-2 mutation with AtSpo11-1 and Atrec8, we obtained plants producing diploid gametes through a mitotic-like division that were genetically identical to their parents. Thus tam alleles displayed phenotypes very similar to that of the previously described osd1 mutant. Combining tam and osd1 mutations leads to a failure in the prophase to meiosis I transition during male meiosis and to the production of tetraploid spores and gametes. This suggests that TAM and OSD1 are involved in the control of both meiotic transitions.
From physical mobility to psychological mobilization: The benefits of changing location and caregiver in a mobile team for adolescent psychiatry  [PDF]
Sylvie Tordjman
Health (Health) , 2013, DOI: 10.4236/health.2013.56A3006
Abstract:

We have developed a mobile team for adolescents with psychological difficulties that can intervene within 48 hours, if necessary. Practically, caregivers working in pairs go wherever the adolescents are (home, General Practioner’s office, etc.), travelling in a motorhome designed as a mobile office. This method allows us to approach more closely the adolescents and their families in the here and now that corresponds to our societal evolution. Most of the adolescents seen by the mobile team do not express any explicit demand but the demand is expressed by the professionals in direct contact with these adolescents in difficulty (school professionals, General Practitioners, etc.), who alert the mobile team and solicit the adolescents’ parents to call the mobile team. One characteristic of this mobile team is the mobility of setting (by changing locations, including the use of a mobile office, and caregivers, so that multiple representations are mobilized). Statistical analyses conducted on 520 adolescents followed by the mobile team showed that the first meetings tend to take place in the family’s home, subsequently transferring to the mobile office and finally in the community mental health centres. There is therefore a transition from the living space (a place that is part of the here and now) to the caregiving space (a space of thought and for thinking), with the mobile office serving as an intermediate step in this movement towards accessing care. Furthermore, there was a significant association between changes of locations and continuity of care. Thus, there were significantly more breakdowns in continuity when the consultations all take place in a single location (family home, mobile office, community centre). The results and their therapeutic implications will be discussed in this article, especially with regard to the key role played by physical movement in psychological mobilization, and by plurality of representations associated with different locations and caregivers.

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