1,721,016 research outputs found
A symmetric Galerkin BEM for plate bending analysis
No full textThe Symmetric Galerkin Boundary Element Method is employed in thin bending plate analysis in accordance with the Love-Kirchhoff kinematical assumption. The equations are obtained through the stationary conditions of the total potential energy, written for a plate whose boundary is discretized in boundary elements. Since the matrix coefficients are made up as double integrals with high order singularities, a strategy is shown to compute these coefficients in closed form. Furthermore, in order to model the kinematical discontinuities and to weight the mechanical quantities along the boundary elements, the Lagrangian quadratic shape functions. The effectiveness of the matrix coefficients is shown through the rigid body movement technique
Flexibility and resistance to cyclic fatigue of endodontic instruments made with different nickel-titanium alloys:a comparative test
No full textStudio microbiologico sull’efficacia in vitro di un nuovo dispositivo per l’irrigazione del sistema canalare.
No full textMolecular cytogenetic analysis of the Appenine endemic cyprinid fish Squalius lucumonis and three other Italian leuciscines using chromosome banding and FISH with rDNA probes
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Mitochondrial DNA in Atherina (Teleostei, Atheriniformes): differential distribution of an intergenic spacer in lagoon and marine forms of Atherina boyeri
No full textThe big-scale sand smelt Atherina boyeri lives in fresh water, brackish water and sea water of the western Atlantic Ocean and Mediterranean Sea. Previous studies concerning distribution, biometric characters and genetic molecular markers have suggested the possible existence of two or even three different groups or species of sand smelt, one ‘lagoon’ type and one (or two – punctuated and non-punctuated on the flanks) ‘marine’ type. In this study, the presence and the localization of an insertion was described, c. 200 bp in length, in the mtDNA of the lagoon and marine punctuated specimens of A. boyeri and its absence in the marine non-punctuated specimens, as well as in other two congeneric species, Atherina hepsetus and Atherina presbyter, and in the atheriniform Menidia menidia. The intergenic spacer is located between the tRNAGlu and cytochrome b (cyt b) genes and shares a c. 50% sequence similarity with cyt b. The distribution and the features of the intergenic spacer suggest that it might have originated from an event of gene duplication, which involved the cyt b gene (or, more likely, a part of it) and which took place in the common ancestor of the lagoon and the marine punctuated specimens. The data obtained therefore support the hypothesis of the existence of three cryptic and, or sibling species within the A. boyeri taxon and provide a genetic molecular marker to distinguish them
Valutazione della lunghezza di lavoro con un localizzatore apicale di recente commercializzazione.
No full textRiunito odontoiatrico e contaminazione da Legionella della rete idrica: rischio reale o ipotetico?
No full textIsolation, characterization and cross-species testing of microsatellites obtained from a sand smelt (Atherina boyeri) genomic library
No full textAB This study reports the isolation and characterization of 11 polymorphic microsatellites from a sand smelt (Atherina boyeri) genomic library. Enrichment was performed with di-, tri- and tetranucleotide motifs following the FIASCO procedure (fast isolation by AFLP of sequences containing repeats). All loci were found to be in linkage and in Hardy-Weinberg equilibrium. This represents the first microsatellite isolation for the family Atherinidae and the isolated loci were accordingly tested on four additional species of the family: two recognized (A. presbyter and A. hepsetus) and two proposed ('punctata' and 'non-punctata' forms). Moreover their cross-species suitability on Menidia menidia, belonging to the same order but to the family Atherinopsidae, was also tested
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