| 1 | Incremental value of compression ultrasound sonography in the emergency department显示文摘The quick evaluation of venous thromboembolism is a key point of modern medicine since the delayed diagnosis is associated with a worse prognosis.Venous ultrasound(VU)is a sensitive and rapidly performed test in cases of suspected deep venous thrombosis.Various protocols have been proposed for its execution,such as the study of the whole deep venous circulation of the lower limb or the analysis of the femoral-popliteal area.The aim is to detect a vessel thrombus and the most sensitive element is the non-compressibility with the probe.Initially,the thrombus is hypoechogenic and adherent to the vessel;later,it tends to organize and recanalize.Usually,in the early stages,the risk of embolism is higher.The role of studying the iliac axis and calf veins is still uncertain.VU is not useful for assessing response to anticoagulation therapy and it is unclear whether the persistence of thrombotic abnormalities can guide on a possible prolongation of therapy. | Alessandro Di Vilio Andrea Vergara Alfonso Desiderio Franco Iodice Alessandro Serio Stefano Palermi Francesco Gambardella Simona Sperlongano Renato Gioia Maria Acitorio Antonello D'Andrea | 2021 | World Journal of Critical Care Medicine2021，10，5： | 0 |
| 2 | An in-depth multi-technique characterization of rare earth carbonates-RE_(2)(CO_(3))_(3)·2H_(2)O-owning tengerite-type structure显示文摘The present study has been conducted to contribute,once and for all,filling the lack of structural information for the whole class of rare earth(RE)carbonates owning the tengerite-(Y)structure.A complete structural characterization,carried out by Rietveld refinement of X-ray powder diffraction(XRD)data,was comparatively performed for the first time on several hydrated RE carbonates,having the general chemical formula RE_(2)(CO_(3))_(3)·χH_(2)O,RE=Y,Gd,Tb,Dy,Ho and Er.All samples share the same space group and lattice parameters similar to tengerite-(Y);the structures are also closely related,consisting in all cases of a three-dimensional framework of nine-fold coordinated RE atom polyhedral,linked together by carbonate ions.In addition to relatively minor changes in fractional coordinates of atom sites and corresponding interatomic distances,the only perceivable difference lies in the lattice parameters affected by the ionic radius of RE^(3+).However,in the case of Er,which has the lowest cationic radius among the analyzed RE,the stabilization of tengerite structure is at its limit condition,because the carbonate groups are heavily distorted.Furthermore,FT-IR and Raman spectra confirm the main structural features obtained by Rietveld refinements.The observed morphology of the various samples is almost the same,being characterized by the presence of bidimensional rod-like particles grouped in agglomerates,typical of tengerite crystals,thus indicating that the crystallization mechanism occurring during the hydrothermal synthesis is the same,irrespective of the involved RE cation. | Luca Spiridigliozzi Mauro Bortolotti Grazia Accardo Alessandro Vergara Domenico Frattini Claudio Ferone Raffaele Cioffi Gianfranco Dell'Agli | 2022 | Journal of Rare Earths2022，40，8： | 0 |
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