Search results for "insert"
showing 10 items of 440 documents
Los retos del sistema educativo en España
2011
International audience; A lo largo de las últimas décadas, el sistema educativo español ha cambiado profundamente. Sin embargo, a pesar de los esfuerzos realizados y de las múltiples reformas emprendidas, la eficacia interna y externa del sector sigue siendo pequeña en comparación con otros países de nuestro entorno. Gran parte de los problemas que padece el sector se debe a su escasa diversidad y a su ausencia de diferenciación. A nuestro juicio, organizar el sistema de enseñanza de manera que cada alumno encuentre un lugar en la esfera educativa que le permita adquirir unas cualificaciones a la medida de sus posibilidades y negociables en el mercado de trabajo es el mayor reto al que se e…
Targeting the vascular endothelial growth factor system to prevent ovarian hyperstimulation syndrome
2008
BACKGROUND: Ovarian hyperstimulation syndrome (OHSS) typically occurs when ovaries are primed with FSH/ LH and subsequently exposed to hCG. The ultimate pathophysiological step underlying this clinical picture is increased vascular permeability (VP). METHODS: A search of the literature was carried out using PubMed and the authors’ files. RESULTS: In rodents and humans, the expression of vascular endothelial growth factor (VEGF) and VEGF receptor 2 (VEGFR-2) mRNA increases during ovarian stimulation. With the administration of hCG, the expression of each rises to a maximum. Expression of VEGF/VEGFR-2 mRNAs correlates with enhanced VP, with both peaking 48 h following an injection of hCG. Imm…
Katalizatory i proces koordynacyjnej polimeryzacji etylenu - eksperyment i teoria
2004
Badania eksperymentalne i teoretyczne koordynacyjnej polimeryzacji etylenu przeprowadzono wobec katalizatorów otrzymanych z prekursorów - kompleksów halogenków Ti, Zr, Hf, V z organicznymi zasadami Lewisa, nośnika magnezowego [MgCl2(THF)2] i związków glinoorganicznych. Określono zależnosć pomiędzy rodzajem halogenków w prekursorze a aktywnością katalizatora wanadowego. Ustalono profile energetyczne reakcji insercji i terminacji (beta-eliminacji) oraz przeniesienia atomu wodoru beta. Obliczone wartości barier insercji, a także energii wiązania etylenu do centrum aktywnego dobrze korelują z wynikami polimeryzacji. Stwierdzono występowanie w centrach aktywnych oddziaływań agostycznych, które o…
Le profil des NEET a-t-il évolué en 20 ans ?
2018
Depuis plus de trois décennies, l’entrée de la jeunesse sur le marché du travail est une préoccupation majeure dans la société française. L’insertion professionnelle s’avère complexe pour nombre de jeunes et les frontières sont relativement floues entre chômage et inactivité. Ainsi, certains jeunes sans emploi peuvent ne pas être comptabilisés statistiquement comme chômeurs car ils ne remplissent pas toutes les conditions. Certains ainsi souhaitent travailler mais ne sont pas disponibles pour...
Le travail salarié des étudiants en France
2018
Depuis 20 ans, les enquêtes Génération visent à éclairer la connaissance sur l'insertion professionnelle des jeunes et aident au pilotage des politiques publiques qui l'accompagnent. Selon les éditions, entre 20 000 et 55 000 jeunes sortis la même année du système scolaire ont été interrogés sur leurs premières années de vie active. Grâce à ce dispositif, le Céreq peut aujourd'hui rendre compte des permanences et des principaux changements en matière d'accès des jeunes au marché du travail, au terme de deux décennies marquées par l'installation du chômage massif et par un accès toujours plus important à l'enseignement supérieur. Ce travail de synthèse et d'analyse sur longue période est l'o…
Writing Oneself into Someone Else’s Story – Experiments With Identity And Speculative Life Writing in Twilight Fan Fiction
2015
Fan fiction offers rich data to explore readers’ understanding of gendered discourses informing the narrative construction of fictional and real-life identities. This paper focuses on gender identity construction in self-insertion fan fiction texts – stories that involve avatars of fan writers – based on Stephenie Meyer’s Twilight novels. Self-insertion fan fiction stories can be considered a form of life writing where authors play with their identity in a virtual context in texts that mix documentary elements and fiction; a combination that is here termed as speculative life writing. While earlier studies have discussed self-insertion fan fiction as a potentially empowering form of resista…
In vitro evolution of an atrazine-degrading population under cyanuric acid selection pressure: Evidence for the selective loss of a 47kb region on th…
2011
International audience; The adaptation of microorganisms to pesticide biodegradation relies on the recruitment of catabolic genes by horizontal gene transfer and homologous recombination mediated by insertion sequences (IS). This environment-friendly function is maintained in the degrading population but it has a cost which could diminish its fitness. The loss of genes in the course of evolution being a major mechanism of ecological specialization, we mimicked evolution in vitro by sub-culturing the atrazine-degrading Pseudomonas sp. ADP in a liquid medium containing cyanuric acid as the sole source of nitrogen. After 120 generations, a new population evolved, which replaced the original on…
Viroporins, Examples of the Two-Stage Membrane Protein Folding Model
2015
Viroporins are small, α-helical, hydrophobic virus encoded proteins, engineered to form homo-oligomeric hydrophilic pores in the host membrane. Viroporins participate in multiple steps of the viral life cycle, from entry to budding. As any other membrane protein, viroporins have to find the way to bury their hydrophobic regions into the lipid bilayer. Once within the membrane, the hydrophobic helices of viroporins interact with each other to form higher ordered structures required to correctly perform their porating activities. This two-step process resembles the two-stage model proposed for membrane protein folding by Engelman and Poppot. In this review we use the membrane protein folding …
O Brasil na rota das migrações internacionais qualificadas espanholas no século XXI
2018
In order to understand recent migration, it is crucial to analyze the migratory modalities such as skilled international migration to Brazil, especially considering the ongoing transnational economic processes and their effects on the corresponding societies. Therefore, this article seeks to understand how the migratory dynamics of highly skilled Spanish professionals to the country are established taking into account the theoretical contribution of the circulation of brains and the category of knowledge workers. For this purpose, information from Brazilian?s Ministry of Labor is used on labor authorizations, financial contributions and insertion in the formal market in Spain; as well as da…