332 research outputs found

    Entanglement susceptibility: Area laws and beyond

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    Generic quantum states in the Hilbert space of a many body system are nearly maximally entangled whereas low energy physical states are not; the so-called area laws for quantum entanglement are widespread. In this paper we introduce the novel concept of entanglement susceptibility by expanding the 2-Renyi entropy in the boundary couplings. We show how this concept leads to the emergence of area laws for bi-partite quantum entanglement in systems ruled by local gapped Hamiltonians. Entanglement susceptibility also captures quantitatively which violations one should expect when the system becomes gapless. We also discuss an exact series expansion of the 2-Renyi entanglement entropy in terms of connected correlation functions of a boundary term. This is obtained by identifying Renyi entropy with ground state fidelity in a doubled and twisted theory.Comment: minor corrections, references adde

    Executive functions in universal design for learning: moving towards inclusive education

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    This article partially introduces and analyses the results of a project funded by the Spanish Ministry of Science and Innovations regarding the ‘Application of Universal Design for Learning by means of the use of digitally accessible materials: implications for literacy in Primary Education and teacher education-DUALECTIC’(Ref. EDU2011-24926), within the National R+D+I Plan 2008– 2011. Sub-programme of Fundamental Research Projects 2011-2014The aim of this study is to understand the way in which executive functions are promoted in students by analyzing the Universal Design for Learning (UDL) principles, guidelines and checkpoints. After having performed a content analysis of such material, the results show that a little over half of the 31 checkpoints address the 12 executive functions being considered, the most prominent being: feedback response, planning, metacognition and organisation. Among the three brain networks represented in UDL, in particular, cognitive control has a more relevant presence in the strategic and affective networks, which indicates the importance given to teachers promoting that students learn how to anticipate, structure and decide their learning actions, and how students can rebuild their experience and learning, through reflection, revision and improvement processes. It is concluded that UDL not only constitutes a framework that enhances improvement towards barrier elimination to students’ learning and participation, but it also provides guidance for classroom practices that can improve the executive ability of students as long as there is encouragement to develop the affective dimension and its internal management within the learning contextMinisterio de Ciencia e Innovación. Plan Nacional de I+D+i 2008-2011. Subprograma de Proyectos de Investigación Fundamental 2011-2014Application of Universal Design for Learning by means of the use of digitally accessible materials: implications for literacy in Primary Education and teacher education-DUALECTIC;(EDU2011-24926) National R+D+I Pla

    Development and characterization of an eggplant (Solanum melongena) doubled haploid population and a doubled haploid line with high androgenic response

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    [EN] We developed an eggplant doubled haploid (DH) population from a commercial hybrid through androgenesis in microspore culture. Morphological variation, reproductive ability and androgenic responsiveness were evaluated. The DH population showed segregation in vegetative traits related to leaf, flower and fruit, and in reproductive traits such as fruit and seed setting or germination rate. The DH population and subsequent generations also presented variation in the androgenic response, with null, low and high response lines. From this population, we were able to identify the first eggplant highly androgenic DH line (DH36), remarkably similar to the donor hybrid in terms of morphology and reproductive ability, but stably producing four times more calli than the hybrid. The segregating DH population is potentially useful for genetic studies and mapping of several traits, whereas the highly androgenic line DH36 may be used as a model line to facilitate the study of eggplant androgenesis and embryogenesis for both basic and applied research.We would like to thank the reviewers of this manuscript for their critical and helpful comments. This work was supported by Grant AGL2014-55177-R to JMSS from Spanish Ministerio de Economia y Competitividad (MINECO) jointly funded by FEDER. ARS is supported by a Predoctoral Fellowship from the FPI Program of Universitat Politecnica de Valencia.Rivas-Sendra, A.; Manuel Campos-Vega; Calabuig-Serna, A.; SeguĂ­-Simarro, JM. (2017). Development and characterization of an eggplant (Solanum melongena) doubled haploid population and a doubled haploid line with high androgenic response. 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Euphytica 195:369–382Corral-MartĂ­nez P, Parra-Vega V, SeguĂ­-Simarro JM (2013) Novel features of Brassica napus embryogenic microspores revealed by high pressure freezing and freeze substitution: evidence for massive autophagy and excretion-based cytoplasmic cleaning. J Exp Bot 64:3061–3075Daghma DES, Hensel G, Rutten T, Melzer M, Kumlehn J (2014) Cellular dynamics during early barley pollen embryogenesis revealed by time-lapse imaging. Front Plant Sci 5:675Doğramacı-Altuntepe M, Peterson TS, Jauhar PP (2001) Anther culture-derived regenerants of durum wheat and their cytological characterization. J Hered 92:56–64Dumas de Vaulx R, Chambonnet D (1982) Culture in vitro d’anthĂšres d’aubergine (Solanum melongena L.): stimulation de la production de plantes au moyen de traitements Ă  35°C associĂ©s Ă  de faibles teneurs en substances de croissance. 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Crop Sci 30:188–192Rivas-Sendra A, Corral-MartĂ­nez P, Camacho-FernĂĄndez C, SeguĂ­-Simarro JM (2015) Improved regeneration of eggplant doubled haploids from microspore-derived calli through organogenesis. Plant Cell Tissue Organ Cult 122:759–765Rizza F, Mennella G, Collonnier C, Shiachakr D, Kashyap V, Rajam MV, Prestera M, Rotino GL (2002) Androgenic dihaploids from somatic hybrids between Solanum melongena and S. aethiopicum group Gilo as a source of resistance to Fusarium oxysporum f. sp. melongenae. Plant Cell Rep 20:1022–1032Rotino GL (1996) Haploidy in eggplant. In: Jain SM, Sopory SK, Veilleux RE (eds) In vitro haploid production in higher plants. Kluwer Academic Publishers, Dordrecht, pp 115–141Rotino GL, Restaino F, Gjomarkaj M, Massimo M, Falavigna A, Schiavi M, Vicini E (1991) Evaluation of genetic variability in embryogenetic and androgenetic lines of eggplant. 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Springer, New York, pp 209–244SeguĂ­-Simarro JM, Nuez F (2008) Pathways to doubled haploidy: chromosome doubling during androgenesis. Cytogenet Genome Res 120:358–369SeguĂ­-Simarro JM, Corral-MartĂ­nez P, Parra-Vega V, GonzĂĄlez-GarcĂ­a B (2011) Androgenesis in recalcitrant solanaceous crops. Plant Cell Rep 30:765–778Snape JW, Sitch LA, Simpson E, Parker BB (1988) Tests for the presence of gametoclonal variation in barley and wheat doubled haploids produced using the miah system. Theor Appl Genet 75:509–513Soriano M, Li H, Jacquard C, Angenent GC, Krochko J, Offringa R, Boutilier K (2014) Plasticity in cell division patterns and auxin transport dependency during in vitro embryogenesis in Brassica napus. Plant Cell 26:2568–2581Toppino L, Mennella G, Rizza F, D’Alessandro A, Sihachakr D, Rotino GL (2008) ISSR and isozyme characterization of androgenetic dihaploids reveals tetrasomic inheritance in tetraploid somatic hybrids between Solanum melongena and Solanum aethiopicum group Gilo. 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    Assessment of a surface-active ionic liquid formulation for EOR applications: Experimental and simulation studies

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    This study aims to assess a surfactant blend for enhanced oil recovery from carbonate rocks. Due to the abundance of these reservoirs, their profitable exploitation would ensure our petrochemical needs are met, and maintain current quality of life. The objective of this work is to increase the technology readiness level of our previous proposal based on the use of a blend of pure sodium dodecylbenzene sulfonate and the surface-active ionic liquid cocosalkylpentaethoximethyl ammonium methylsulfate. To that aim, the method was adapted for its application with a commercially available petrochemical surfactant (RECOLAS103, a mixture of lineal alkyl benzene sulfonates), and reservoir simulations were carried out to evaluate its effectiveness. Phase behavior, stability, dynamic interfacial tension, adsorption and core flooding were the experimental tests carried out. An optimized formulation consisting of 1 wt% of blend (40 wt% RECOLAS103) in synthetic sea water was found stable and able to reduce water-oil interfacial tension down to 0.02 mN/m. The dynamic blend adsorption in carbonate rocks was found to be 0.60 mg/grock, a promising value for the application. Core flooding tests were conducted at 25 and 120 °C and additional oil recoveries achieved ranged from 10.2 to 12.7% of the original oil in place, the lowest production obtained at the highest temperature. This work offers an advance in the application of surfactants for EOR in carbonate reservoirs, since it improves previous proposals that show stability or high adsorption problems. Moreover, a chemical injection optimization was also carried out by simulation with the CMG-STARS software. Results point to the possibility of reaching higher oil recoveries than those obtained experimentally if the extraction method is optimizedS

    Latest Cretaceous palaeogeographic evolution of northeast Iberia: Insights from the Campanian continental MontalbĂĄn subbasin (Spain)

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    This work characterizes for the first time the 500–700 m-thick uppermost Cretaceous continental sedimentary succession of the Allueva Fm recorded in the northeastern margin of the Iberian basin, in the Montalbán subbasin (Maestrazgo domain, Spain). The middle-upper Campanian age of this unit constrained here by new paleomagnetic and biostratigraphic data involves major revision of previous stratigraphic and palaeogeographic interpretations. The uplift of the northern marginal areas of the Montalbán subbasin onwards from the middle Campanian supplied the coarse terrigenous-clastic sediments common in the alluvial Allueva Fm. Moreover, a sharp increase of the sedimentation rates (from 4 to 19 cm/ky) from the lower to the middle-upper part of the Allueva Fm has been related to further increase of the tectonic activity during the middle part of the late Campanian. Also relevant are the new discovered vertebrate sites mostly found in the marginal areas of a large lacustrine-palustrine carbonate system developed during the latest Campanian. Vertebrate sites include a fossil assemblage with abundance of titanosaur sauropod dinosaurs as well as the presence of ornithopod dinosaurs and crocodylomorphs. A review of the dinosaur fossil sites recorded in other Iberian subbasins shows a similar fossil assembage occurrence during the late Campanian–earliest Maastrichtian timespan, previous to the faunal turnover that took place in the Ibero-Armorican landmass around the onset of the late Maastrichtian. The stratigraphic, sedimentological and paleontological characterization of the successions recorded during the initial stages of development of the Montalbán subbasin have major implication to understand the latest Cretaceous palaeogeographic evolution of northeast Iberia. Comparative review to other latest Cretaceous continental successions deposited in other domains of the Iberian basin indicates a south to north migration of newly developed subsident subbasins: during the Campanian (South Iberian domain), during the middle-late Campanian (northern Maestrazgo domain), and during the Maastrichtian (central Castillian domain)

    Intraarterial route increases the risk of cerebral lesions after mesenchymal cell administration in animal model of ischemia

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    Mesenchymal stem cells (MSCs) are a promising clinical therapy for ischemic stroke. However, critical parameters, such as the most effective administration route, remain unclear. Intravenous (i.v.) and intraarterial (i.a.) delivery routes have yielded varied outcomes across studies, potentially due to the unknown MSCs distribution. We investigated whether MSCs reached the brain following i.a. or i.v. administration after transient cerebral ischemia in rats, and evaluated the therapeutic effects of both routes. MSCs were labeled with dextran-coated superparamagnetic nanoparticles for magnetic resonance imaging (MRI) cell tracking, transmission electron microscopy and immunohistological analysis. MSCs were found in the brain following i.a. but not i.v. administration. However, the i.a. route increased the risk of cerebral lesions and did not improve functional recovery. The i.v. delivery is safe but MCS do not reach the brain tissue, implying that treatment benefits observed for this route are not attributable to brain MCS engrafting after stroke.This study has been partially supported by grants from Axencia Galega de Innovación (Xunta de Galicia), the Instituto de Salud Carlos III (PI13/00292; PI14/01879), the Spanish Research Network on Cerebrovascular Diseases RETICS-INVICTUS (RD12/0014), Xunta de Galicia (Consellería Educación GRC2014/027), the European Commission program FEDER and Promoting Active Ageing program: Functional Nanostructures For Alzheimer’s Disease At Ultra-Early Stages” (Pana_686009), a Research and Innovation Project, funded within the EU Horizon 2020 Programme”. Furthermore, this study was also co-funded within the POCTEP (Operational Programme for Cross-border Cooperation Spain-Portugal) program (0681_INVENNTA_1_E), co-financed by the ERDF (European Regional Development Fund). T. Sobrino (CP12/03121) and F. Campos (CP14/00154) are recipients of a research contract from Miguel Servet Program of Instituto de Salud Carlos III. Finally, P. Taboada thanks Mineco and Xunta de Galicia for funding through projects MAT2013-40971-R and EM2013-046, respectively. J Trekker is the recipient of an innovation grant from the IWT-VlaanderenS

    Epidemiological and Clinical Complexity of Amoxicillin-Clavulanate- Resistant Escherichia coli

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    Two hundred twelve patients with colonization/infection due to amoxicillin-clavulanate (AMC)-resistant Escherichia coli were studied. OXA-1- and inhibitor-resistant TEM (IRT)-producing strains were associated with urinary tract infections, while OXA-1 producers and chromosomal AmpC hyperproducers were associated with bacteremic infections. AMC resistance in E. coli is a complex phenomenon with heterogeneous clinical implications

    Myc inhibition is effective against glioma and reveals a role for Myc in proficient mitosis.

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    Gliomas are the most common primary tumours affecting the adult central nervous system and respond poorly to standard therapy. Myc is causally implicated in most human tumours and the majority of glioblastomas have elevated Myc levels. Using the Myc dominant negative Omomyc, we previously showed that Myc inhibition is a promising strategy for cancer therapy. Here, we preclinically validate Myc inhibition as a therapeutic strategy in mouse and human glioma, using a mouse model of spontaneous multifocal invasive astrocytoma and its derived neuroprogenitors, human glioblastoma cell lines, and patient-derived tumours both in vitro and in orthotopic xenografts. Across all these experimental models we find that Myc inhibition reduces proliferation, increases apoptosis and remarkably, elicits the formation of multinucleated cells that then arrest or die by mitotic catastrophe, revealing a new role for Myc in the proficient division of glioma cells

    Spanish Multicenter Study of the Epidemiology and Mechanisms of Amoxicillin-Clavulanate Resistance in Escherichia coli

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    We conducted a prospective multicenter study in Spain to characterize the mechanisms of resistance to amoxicillin-clavu-lanate (AMC) in Escherichia coli. Up to 44 AMC-resistant E. coli isolates (MIC>32/16 g/ml) were collected at each of theseven participant hospitals. Resistance mechanisms were characterized by PCR and sequencing. Molecular epidemiology was studied by pulsed-field gel electrophoresis (PFGE) and by multilocus sequence typing. Overall AMC resistance was 9.3%. The resistance mechanisms detected in the 257 AMC-resistant isolates were OXA-1 production (26.1%), hyperpro-duction of penicillinase (22.6%), production of plasmidic AmpC (19.5%), hyperproduction of chromosomic AmpC(18.3%), and production of inhibitor-resistant TEM (IRT) (17.5%). The IRTs identified were TEM-40 (33.3%), TEM-30(28.9%), TEM-33 (11.1%), TEM-32 (4.4%), TEM-34 (4.4%), TEM-35 (2.2%), TEM-54 (2.2%), TEM-76 (2.2%), TEM-79(2.2%), and the new TEM-185 (8.8%). By PFGE, a high degree of genetic diversity was observed although two well-defined clusters were detected in the OXA-1-producing isolates: the C1 cluster consisting of 19 phylogroup A/sequence type 88[ST88] isolates and the C2 cluster consisting of 19 phylogroup B2/ST131 isolates (16 of them producing CTX-M-15). Each of the clusters was detected in six different hospitals. In total, 21.8% of the isolates were serotype O25b/phylogroup B2 (O25b/B2). AMC resistance in E. coli is widespread in Spain at the hospital and community levels. A high prevalence of OXA-1 was found. Although resistant isolates were genetically diverse, clonality was linked to OXA-1-producing isolates of the STs 88 and 131. Dissemination of IRTs was frequent, and the epidemic O25b/B2/ST131 clone carried many different mechanisms of AMC resistance
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