114,704 research outputs found
Potential allelochemicals from Pistia stratiotes L.
No full textAmong the substances isolated from ethyl ether extract of Pistia stratiotes L., linoleic acid, γ-linolenic acid, (12R,9Z,13E,15Z)-l2-hydroxy- 9,13,15-octadecatrienoicacid, (9S,10E,12Z,15Z)-9-hydroxy-10,12,15-octadecatrienoic acid, α-asarone, and 24S-ethyl-4,22-cholestadiene-3,6-dione were found to inhibit the growth of some microalgae in solid medium. Toxicity of α-asarone on the growth of sensitive algal strains in liquid medium is discussed. © 1991 Plenum Publishing Corporation
SPHeritage: un progetto di ricerca per lo studio dei cambiamenti ambientali del passato attraverso il patrimonio culturale
No full textIl contributo riguarda la presentazione degli obiettivi e dei risultati preliminari del Progetto SPHeritage 2019, finanziato dal Ministero dell’Università e della Ricerca italiano. Si tratta di un’iniziativa congiunta tra due Università principali (Pisa e Milano) con diverse collaborazioni (Università di Genova, Musée d’Anthropologie préhistorique de Monaco) che riguarda lo studio geoarcheologico dell’arco ligure-provenzale, con un focus sull’area archeologica dei Balzi Rossi (Ventimiglia, Liguria). Si presentano tutte le attività che sono finalizzate a comprendere la variazione del livello del mare (su un arco cronologico di circa 400.000 anni) e i suoi rapporti con il comportamento dei gruppi umani nel passato (Neanderthal e AMH) al fine di comprendere l’evoluzione climatica presente e futura e la sua influenza sul popolamento umano.The contribution concerns the presentation of the intentions and preliminary results of the SPHeritage 2019 project, funded by the Italian Ministry of University and Research. It is a joint operation between two main universities (Pisa and Milan) and a series of collaborations (University of Genova, Museum of Prehistoric Anthropology of Monaco) concerning the geoarchaeological
study of the Ligurian-Provençal arch, with a focus on the archaeological area of Balzi Rossi (Ventimiglia, Liguria).
It is a whole series of activities aimed at understanding the variation of the sea level (chronological span about the last 400 thousand years) and its relationship with the behaviour of the human communities of the past (Neanderthal and AMH) in order to appreciate the present and future evolution of our climate and its influence on our population.La contribution concerne la présentation des objectifs et des résultats préliminaires du projet SPHeritage 2019, financé par le Ministère italien de l’Université et de la Recherche. Il s’agit d’une opération conjointe entre deux universités principales (Pisa et Milano) et d’une série de collaborations (Université de Genova, Musée d’Anthropologie préhistorique de Monaco) concernant l’étude géoarchéologique de l’arc ligure-provençal, avec un focus sur la zone archéologique des Balzi Rossi (Vintimille, Ligurie). C’est tout
une série d’activités visant à comprendre la variation du niveau de la mer (sur une période chronologique d’environ 400 000 ans) et sa relation avec le comportement des communautés humaines du passé (Neandertal et AMH) afin de concevoir l’évolution présente et future de notre climat et son influence sur notre population
Partitioning of bronchopulmonary carcinoids in two different prognostic categories by Ki-67 score
No full textIntroduction: Histological distinction between typical and atypical bronchopulmonary car- cinoids is based on mitotic activity and necrosis. Regardless of these two parameters, outcome after surgery is often unpredictable. In this study the prognostic value of different clinico-pathological factors was retrospectively analyzed in a large series of patients with bronchopulmonary carcinoid. Materials and Methods: The long-term post-surgical out- come of 106 radically treated patients affected by bronchopulmonary carcinoid from two Italian centers was correlated with tumor characteristics assessed by combining conven- tional histology with a panel of immunohistochemical markers of neuroendocrine differen- tiation (chromogranin-A, NSE) and proliferation activity (Ki-67 score). Results: Carcinoids were assessed as typical (TC = 75; 70.8%) and atypical (AC = 31; 29.2%). Mean follow-up was 8.3 years (range: 0-20; median: 8.0). All cases expressed neuroendocrine markers. At univariate analysis, tumor recurrence [14/75 TC (18.7%), 15/31 AC (48.4%)] correlated with carcinoid histotype (P = 0.003), tumor size (P = 0.012), mitotic index (P = 0.044), Ki-67 score (P < 0.0001), and synchronous node metastasis (P = 0.037). Of these, Cox multivari- ate analysis confirmed only Ki-67 score as independent predictor of disease recurrence (P = 0.009). The best cut-off for Ki-67 score (calculated by ROC curves) discriminating recurrent vs non-recurrent disease was 4% (sensitivity 79.3%; specificity 83.8%; area under the curve 0.85). By stratifying patients according to this cut-off, a significantly dif- ferent disease-free survival was found (log-rank test P < 0.0001). Conclusion: Ki-67 score accurately separates bronchopulmonary carcinoids in two well-distinct histo-prognostic categories. Ki-67 score predicts the patients outcome better than mitotic count, histotype, and tumor stage and it is therefore helpful in establishing the appropriate follow-up. © 2011 Grimaldi, Muser, Beltrami, Machin, Morelli, Pizzolitto, Talmassons, Marciello, Colao, Monaco, Monaco and Faggiano
Inquadramento delle Fratture delle Ossa Lunghe dell’Arto Inferiore. V. Consoli, M. Manca, A. Parra, L. Donati, V. Monaco Le Fratture dell’Arto Inferiore e lo Sport, Università di Pisa-ACSI, p. 57 – 66, Ottobre 1998
No full textIn vitro algal growth inhibition by phytotoxins of Typha latifolia L.
No full textThe ether extract of Typha latifolia L. inhibited the growth of some microalgae. Among the substances chromatographically isolated and characterized from the ether extract, three steroids [β-sitosterol, (20S) 24-methylenlophenol, and stigmast-4-ene-3,6-dione] and three fatty acids [α- linolenic, linoleic, and an unidentified C8:2] were found to inhibit the growth of some microalgae tested. A selective effect of these substance on blue-green algae (particularly on T 625 Synechococcus leopoliensis and on T 1444 Anabaena flosaquae) was observed. © 1990 Plenum Publishing Corporation
Spatio-temporal parameters and intralimb coordination patterns describing hemiparetic locomotion at controlled speed
No full text
Fondazioni e interessi generali in Italia
No full textDopo aver rilevato la crescente importanza delle fondazioni quali enti che perseguono interessi generali nei paesi europei, si sono esaminate le varie tipologie di fondazioni c.d. " statuto speciale" in Italia. Ci si è poi interrogati sulla problematica natura giuridica di tali fondazioni. Inoltre, dopo aver sinteticamente delineato le trasformazioni che hanno interessato le fondazioni di origine bancaria, si è pervenuti alla conclusione che le medesime non svolgono attività di cura di interessi pubblici nei "settori rilevanti"
Shear models of Rc-encased steel joist beams in MRFs
No full textThis study presents the application of different analytical and finite element (FE) models aimed at predicting the shear resistance of reinforced concrete (RC) and reinforced concrete-encased steel joist (HRCESJ) beams with inclined transversal reinforcement in moment resisting frames (MRFs). In particular, four analytical models are taken into account, two of them specifically conceived for HRCESJ beams in seismic area. The analytical models considered are Eurocode-2 model for the shear strength of RC beams; a variable-inclination stress-field approach; a strut-and-tie additive model and, finally, an analytical formulation in which the shear capacity depends on the number of pairs of inclined stirrups able to yield before concrete crushing. The models are validated against a large experimental and FE dataset covering a wide range of characteristic parameters of the beam typology. The results obtained are discussed in order to stress the influence of different key assumptions adopted in both FE and analytical approaches
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