117,927 research outputs found
Italia mirando a Chile a través de los ojos de sus diplomáticos en Santiago
No full textIl saggio, sulla base della documentazione conservata presso l' archivio storico del Ministero degli Esteri Italiano e degli studi prodotti sul tema, ricostruisce la rappresentazione dei processi storici cileni che scaturisce dai rapporti che i diplomatici italiani a Santiago inviano a Roma dal 1864 alla fine degli anni Cinquanta del Novecento e le alterne vicende delle relazioni diplomatiche tra i due paesi in tale arco temporale.The essay reconstructs the representation of Chilean historical processes arising from the reports that Italian diplomats in Santiago sent to Rome from 1864 to the end of the Fifties of the Twentieth Century. On the ground of the documentation preserved in the historical archive of the Italian Foreign Ministry and the studies produced on that subject, explains also the alternate events of the diplomatic relations between the two countries in the same period of time
Il mito politico dell' America latina negli anni sessanta e settanta del novecento
No full textQual'è l'approccio della storiografia italiana alle vicende del mondo contemporaneo? In che modo intellettuali, politici, militanti, operatori sociali guardano a esperienze e vicende di altri paesi? Queste e altre domande sono al centro del volume. Il saggio di Stabili-Guarnieri analizza il modo in cui i modelli politici e culturali latinoamericani hanno influenzato il mondo politico, la società e l'opinione pubblica italiana degli anni '60 e '70 del XX secolo
Zinc effect on the sea urchin Paracentrotus lividus immunological competence
No full textPollution by heavy metals has become one of the most important problems in marine coastal areas as a consequence of anthropogenic inputs. Among metal contaminants, zinc, being considered not very toxic, is sometimes released into the sea in appreciable quantities and its concentration is loosely regulated.
In this work we analyzed the effects of a high zinc concentration on the sea urchin Paracentrotus lividus immune system. In particular, after 24 h of zinc treatment, we evaluated coelomocytes morphology and composition as well as the zinc influence on some humoral parameters such as hemolysis, lysozyme-like activity and antibacterial activity on Vibrio alginolyticus. Our results evidenced that the presence of zinc affected both cellular and acellular components of the sea urchin immune system. The P. lividus coelomocytes changed in morphology and number; moreover, the amebocytes changed from a petaloid to a filipodial-like shape and the red spherula cells increased in number. Among the considered humoral effectors lysozyme-like activity and antibacterial activity on V. alginolyticus decreased in short-term to zinc treatment. The modifications in the sea urchin immunological competence might give an early indication of disease susceptibility thus suggesting to consider the examined defence mechanisms as potential biological indicators of metal pollution
Effect of zinc on lysozyme-like activity of the seastar Marthasterias glacialis (Echinodermata, Asteroidea) mucus
No full textLysozyme represents the best characterized enzyme involved in the self-defense from bacteria. In this
study we analysed the effects of zinc on the lysozyme-like activity of the seastar Marthasterias glacialis
mucus. This activity, detected by measuring the cleared lysis area of dried Micrococcus lysodeikticus cell
walls on Petri dishes, was significantly reduced in presence of zinc. The results are discussed in the light
of elucidating the possible relationship between environmental contaminants and increased disease susceptibility
in seastars due to the decrease of antibacterial protection. The benefits of using the test of lysozyme
activity to monitoring environmental pollution are highlighted
Zinc effect on the immunological competence of the sea urchin Paracentrotus lividus gametes and embryos.
No full textAntibacterial protection in Marthasterias glacialis eggs: characterization of lysozyme-like activity
No full textLa via allendista al socialismo e l’esperienza di governo della Unidad Popular
No full textIl saggio reinterpreta la figura di Salvador Allende, Presidente della Repubblica del Cile dal 1970 al 1973, morto suicida durante il golpe militare del generale Pinochet l'11 settembre 1973. Contrariamente a quanto sostenuto dalla maggior parte della storiografia sul tema, questo saggio evidenzia come sia i riferimenti ideologici, sia la sua pratica politica furono ispirati non soltanto dal pensiero marxista ma soprattutto dal socialismo umanista e dal pensiero repubblicano della massoneria a cui aderì quando era ancora molto giovane.The essay analyze the personality of Salvador Allende, President of the Republic of Chile from 1970 to 1973, who committed suicide during the military coup of General Pinochet on September 11, 1973. It shows how his thought and political practices were not only the product of the Marxist ideology but also of the radical and mason tradition, of the libertarian suggestions of anarchism and of humanitarian socialism
Clearance rates of Sabella spallanzanii and Branchiomma luctuosum (Annelida : Polychaeta) on a pure culture of Vibrio alginolyticus
Get PDFThe influence exerted by filter-feeding activity on bacterial density by two sabellid species from the Mediterranean Sea (Ionian Sea, Italy), Branchiomma lucluosum Grube and Sabella spallanzanii Gmelin (Annelida: Polychaeta) was investigated. Clearance rates and retention efficiencies were estimated utilizing the species Vibrio alginolyticus selected on account of previous field studies and its importance in fish Culture pathogenicity. The C-max was 43.2 +/- 2.63 L h(-1) g(-1) DW for B. luctuosum and 12.4 +/- 2.22 L h(-1) g(-1) DW for S. spallanzanii. The Retention efficiency was 98% corresponding to a removed bacterial biomass of 44.8 + 7.88 mu gC L-1 g(-1) DW for B. luctuosum and 70% corresponding to a bacterial biomass of 23.8 + 2.95 mu gC L-1 g(-1) DW for S. spallanzanii. Maximum retention was recorded after 20 min for the first species and after 30 min for the second one. Present laboratory experiments represent a contribution to the knowledge of the filtration activity of the two polychaetes, characterizing the filtration process on bacterioplankton. Both species resulted extremely efficient in removing V. alginolyticus from seawater in experimental tanks, thus confirming the previous data from the field studies and suggesting their employment as biofilters of microbially contaminated waters in intensive aquacultur
- …
