365 research outputs found
La tutela dei minori stranieri tra diritti consolidati e politiche di chiusura verso l’ “Altro”
No full textLa Collezione afidologica Del Guercio
No full textDopo brevi cenni sulla vita dell\u27entomologo Giacomo Del Guercio, viene illustrata la complessa storia della sua collezione di Afidi, oggi patrimonio dell\u27Istituto di Entomologia agraria dell\u27Università di Milano.La collezione, che consta di circa 3.000 vetrini, pur presentando lacune di vario genere (di specie descritte come nuove, ad esempio, mancano gli esemplari di riscontro o l\u27indicazione dei tipi) racchiude materiale di notevole interesse per lo studio della fauna afidologica italiana.Un elenco degli Afidi identificati da Del Guercio e uno delle piante ospiti degli stessi concludono la presente nota.After a few brief remarks on the life of the entomologist, Giacomo Del Guercio, the complete history of his aphid collection, which today is in the possession of the Institute of Agricultural Entomology of the U niversity of Milan, will be presented.The collection, which consists of about 3,000 slides, although presenting lacunae of various types (for example, for species described as new, specimens for comparison or indications of types are missing) nonetheless contains materiai of noteworthy interest for the study of aphids in Italy.A list of the aphids identified by Del Guercio and one of its host plants will conclude this paper
Chronic venous insufficiency, edema and the permeability of the microvascular barrier
No full textMany hypotheses have been proposed to explain the clinical features and laboratory findings during chronic venous insufficiency (CVI). Edema is known to occur primarily as a result of the increase in venous pressure, accompanied by increased capillary permeability (PerM) and decreased blood colloid osmotic pressure as contributing factors. Nevertheless, there are many clinical and experimental observations which are not consistent with this accepted suggestion. Therefore, the diagnosis of edema is formulated, when edema has already occurred, i.e. only when the collection of the fluid exceeds a certain threshold and becomes clinically or instrumentally evident. The aim of this review was to clarify the pathophysiology of venous edema studying two fundamental processes: filtration and absorption that oversee the balance of intra- and extracellular fluids. In particular, we have described the alterations between filtration and absorption. The mechanisms involved in the CVI are several, starting from the structural rearrangement of the vascular endothelium up to the changes in intra and extracellular fluid. Evaluating the previous studies, we hypothesize that the venous edema is produced by the hydrostatic pressure prevailing on blood oncotic pressure, while the "intermediary" system or transduction system must be able to transform the physical stimulus induced by hypertension in a biochemical message promoting the cellular responses. Moreover, the chronic increase in shear stress, characteristic in CVI, prevails on calcium dependent mechanism, resulting in either hypertension, a mechanical stress, abolishes the Ca++ linked mechanism inducing a stable disassembly of adherens junction, or in the long run, the same mechanisms are unable to preserve the barrier integrity with a profound alteration of the vessel wall PerM, accompanied by leakage of macromolecules and blood cells. In conclusion, it is possible to assume that the essential sign in the venous chronic insufficiencies is not the edema, and then an excess of filtration, but the vessel wall permeation is the key factor to clarify the pathophysiological cascade and the clinical signs
Carotid and vagal body paragangliomas.
No full textBetween 1972 and 2012, 25 patients presenting 32 paragangliomas of the neck were observed. Tumor locations included the carotid body (CBTs) in 21 patients and the vagus nerve in 4. Four patients had bilateral CBT and one a bilateral vagal tumor; a metachronous bilateral jugulare paraganglioma was diagnosed in one patient with bilateral CBT Shamblin type III. Five patients presented CBTs type II and three type III. Preoperative embolization was performed in 5 CBTs, with no significant difference in blood loss. Twenty-nine paragangliomas were resected (with three internal carotid artery resection): there were no cerebrovascular accident or perioperative death. Nine patients (36%) had cranial nerve palsy prior to surgery and a postoperative nerve dysfunction occurred in four other tumors (16%). Persistent nerve deficits occurred in 3 patients (12%). No evidence of malignancy was shown, intraoperatively or during a postoperative follow-up period (9 months to 18 years; mean: 8 years)
Emergency endovascular repair of an acute aortocaval fistula with AAA: case report and review of the literature
No full textA 72-year-old man with sudden abdominal pain and congestive cardiac failure presented a high-flow aortocaval fistula with a large abdominal aortic aneurysm as detected by Duplex ultrasonography and computed tomography angiography. As the patient’s multiple comorbidities precluded open repair, an emergency left aortouniiliac stent-graft deployment and femoro-femoral crossover bypass grafting were performed. Notwithstanding, incomplete exclusion of the fistula due to a small inflow from the contralateral iliac axis, the patient’s cardiac overload decreased with a rapid resolution of cardiac failure, allowing for a staged ligation of the right iliac artery with a complete occlusion of the aortocaval fistula. At present there have been only 12 known cases, including our own, of patients treated with aortic stent-grafts; however, in consideration of the high mortality rate of open repair, endovascular repair is increasingly being recognized as a valuable treatment optio
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