1,721,100 research outputs found
Cultural Capital and educational strategies. Shaping boundaries between groups of students with homologous cultural behaviours
No full textRather than assessing its causal effect on educational attainment, the authors of this article aim to use the concept of cultural capital to define a huge, complex and interconnected collection of educational and school strategies adopted by students and families and to examine the way that these strategies are related to school inequalities. Data analysed come from the 2009 Italian survey for the Program for International Student Assessment run by the OECD. A Latent Class Regression Analysis has been applied to categorize four groups of individuals who share specific cultural habits, educational dispositions and choices, and social status; in short, the four groups differentiate individuals with a different endowment of the intangible asset, cultural capital. Moreover, using the socio-economic status as a covariate we link the latent class membership probability with individuals’ social standing and, consequently school choices
Nucleation of de Sitter from the anti de Sitter spacetime in scalar field models
No full textWe show that, in the framework of Einstein-scalar gravity, the gravitational coupling can drive the nucleation of the de Sitter (dS) spacetime from an anti de Sitter (AdS) one. This is done using a static and spherically-symmetric metastable scalar lump solution. This features an AdS4 spacetime in the solution’s core, allows for dS4 vacua and is plagued by a tachyonic instability. Using the Euclidean action formalism in the semiclassical approximation, we compute and compare the probability amplitudes and the free energies of the AdS4 lump and the dS4 vacua. Our results show that the former is generally less favored than the latter, with the most preferred state being a dS4 vacuum. Thus, we interpret the lump as a metastable state which mediates the decay of the AdS4 spacetime into the true dS4 vacuum. We argue that this nucleation mechanism of dS spacetime may provide insights into the short-distance behavior of gravity, in particular for the characterization of supergravity vacua, cosmological inflation and the black-hole singularity problem
Diagnosis of the neurocardiogenic syncope. Recent knowledges
No full textNeurocardiogenic syncope is a very common clinical problem and represents the most frequent cause of syncope. Its diagnosis is difficult because there are several and heterogeneous causes of syncope, that can interact each other, and the accuracy of the available diagnostic instruments is sometimes not high enough. For these reasons, the classification of a syncope as neurocardiogenic is the result of an evaluation, whose main purpose is the exclusion of the other possible causes of syncope with worse prognosis. The head tilt-up test is recommended for the diagnosis of the most frequent type of neurocardiogenic syncope, the vasovagal syncope. The methodological improvement of tilt test could, in the future, improve its diagnostic accuracy and could optimise the time of execution
Individuazione di siti potenziali in base alle condizioni climatiche per Chilocorus kuwanae Silv. (Coleoptera Coccinellidae), specie reintrodotta in Italia.
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Revision of the Afrotropical mylabrine genus Lydoceras Marseul, 1870 (Coleoptera, Meloidae)
No full textThe blister beetle genus Lydoceras Marseul, 1870, tribe Mylabrini, is revised. Its four species
are redescribed and figured. Faunistic and ecological records of each species also are
summarized. Results of a morphology-based cladistic analysis show Lydoceras lictor
(Gerstäcker, 1885) and L. fasciatus (Fabricius, 1775) as most closely related. These two species
and L. flavosellatus (Fairmaire, 1887) are placed in the nominate subgenus. The group occurs
in eastern Africa and western Arabian Peninsula. The highly distinctive L. stanleyanus
(Duvivier, 1890), endemic to central Africa, is placed in the resurrected subgenus Denierus
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Diagnosis of neurogenic syncope--current views
No full textNeurocardiogenic syncope is a very common clinical problem and represents the most frequent cause of syncope. Its diagnosis is difficult because there are several and heterogeneous causes of syncope, that can interact each other, and the accuracy of the available diagnostic instruments is sometimes not high enough. For these reasons, the classification of a syncope as neurocardiogenic is the result of an evaluation, whose main purpose is the exclusion of the other possible causes of syncope with worse prognosis. The head tilt-up test is recommended for the diagnosis of the most frequent type of neurocardiogenic syncope, the vasovagal syncope. The methodological improvement of tilt test could, in the future, improve its diagnostic accuracy and could optimise the time of execution
Time of diversification in the Cape fauna endemisms, inferred by phylogenetical study of the genus Iselma (Coleoptera: Meloidae: Eleticinae)
No full textThe endemic diversification of the Cape zone fauna and the phylogenetic relationships among the 30 species of the blister beetle genus Iselma are investigated.
We analysed morphological, molecular (mtDNA 16S) and combined datasets of
characters using a number of approaches (maximum parsimony, maximum likelihood,
Bayesian inference analyses). We propose hypotheses of diversification times
among taxa from molecular clock analyses. Morphological and molecular analyses
produced similar results. According to maximum likelihood molecular studies,
radiation within the genus Iselma occurred during the Pliocene and Pleistocene,
roughly contemporaneously with the shift in African climate, vegetation and faunal
assemblages. Two main lineages, one Namibian and one South African, separated
c. 4.9 Ma. Within the South African lineage we identify two groups of endemic
species, one in Little Karoo and one that extend towards southern Namaqualand.
The remaining South African groups of species are spread through Namaqualand and
the southwestern Cape area. These include several endemisms, with different times
of diversification during the Pleistocene, probably related in part to glacial cycles.
These endemisms are distributed in small areas of the following ecosystems: coastal Strandveld, Succulent Karoo and particularly Fynbos
Taxonomy of Iselmeletica Kaszab, 1966 (Coleoptera, Meloidae, Eleticinae), an ignored genus endemic to South Africa
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