Search results for "Alien"
showing 10 items of 553 documents
Notes about the naturalization in Sicily of Paulownia tomentosa (Paulowniaceae) and remarks about its global spread
2019
Paulownia tomentosa is native to different regions of East Asia. Here, the first case of natural regeneration in Sicily is reported. Although Paulownia is not still invading typically Mediterranean areas, mainly due to ecological constraints, its recognized invasiveness at a global level imposes the need to monitor the ongoing process.
La prospezione archeologica: metodi tecnico-scientifici e approccio storico in Germania e in Italia/ Survey-Archaeologie: naturwissenschaftlich-techn…
2017
Dal 30.3. al 2.4.2015 si è tenuto nella Villa Vigoni sul lago di Como, sede del Centro italo-tedesco per l’eccellenza europea, nell’ambito della cooperazione nel campo delle scienze umane e sociali, il convegno sul tema „Survey Archäologie: Naturwissenschaftlich-technische versus historische Methode in Italien und Deutschland – La prospezione archeologica: Metodi tecnico-scientifici e approccio storico in Germania e in Italia”. Il convegno è stato organizzato dalla Georg August Universität Göttingen (Johannes Bergemann) e dalla Università degli Studi di Palermo (Oscar Belvedere). Il seminario si prefiggeva lo scopo di discutere da diversi punti di vista le tecniche e i metodi della prospezi…
The ontogeny of the filter apparatus of anuran larvae (Amphibia, Anura)
1991
The pharynx ofBufo calamita, Rana temporaria andBombina variegata larvae (larval Types IV and III) changes considerably during the latter part of embryonic development. The entodermal regions between the visceral pockets flatten inward to form the anlagen of the filter plates. The ectoderm thrusts forward from the area of the persistent epidermal gills overlying the anlagen of the filter plates. The esophagus pushes dorsolaterally into the pharynx to give rise to the ciliary cushions. Comparison with the development ofXenopus laevis (larval Type I) reveals shared characters: (1) the filter plates are overlapped by the sensory layer of the epiderm and (2) the ciliary grooves are, like the ci…
Considerazioni biogeografiche sulla presenza di specie aliene nella flora vascolare del Mediterraneo
2011
Biogeographia vol. XXX - 2011 (Pubblicato il 23 dicembre 2011) La Biogeografia della Sicilia Considerazioni biogeografiche sulla presenza di specie aliene nella flora Vascolare del Mediterraneo GIANNIANTONIO DOMINA, PIETRO MAZZOLA Dipartimento di Biologia Ameientale e Biodiversita, Universita a’egli Studi di Palermo, via Arc/airafi 38, 90123 Palermo (Italy) Key words: alien vascular flora, islands, Mediterranean, statistics. SUMMARY Relations between the occurrence of aliens and biogeographic Features of some territories in the Mediterranean are analysed. Mediterranean islands host a higher percentage of aliens in comparison with the mainland. The most ‘ important relations have been observed be…
First record of Temnosewellia minor (Platyhelminthes, Temnocephalidae) in Sicily, with a plea for a re-examination of the identity of the publicly av…
2021
Author(s): Vecchioni, Luca; Chirco, Pietro; Bazan, Giuseppe; Marrone, Federico; Arizza, Vincenzo; Arculeo, Marco | Abstract: Ectosymbiotic temnocephalan flatworms belonging to the genus Temnosewellia Damborenea and Cannon, 2001 were collected on Cherax destructor Clark, 1936 in an aquaculture farm in Sicily, Italy. This represents the first record of a temnocephalan species for the fauna of the island. Morphological and molecular identification of the collected specimens proved that they belong to the allochthonous species Temnosewellia minor Haswell, 1888, which was introduced along with crayfishes bred in aquaculture farms. The phylogenetic analyses carried out for the molecular identific…
Stem-injection of herbicide for control of Ailanthus altissima (Mill.) Swingle: a practical source of power for drilling holes in stems
2013
Abstract: Ailanthus altissima is a well-known invasive tree in many parts of the world showing an outstanding ability to establish within woodlands and other less-disturbed habitats. Previous studies have reported that control of this species is very difficult because of its strong resprouting. Indeed, effective control can be achieved only by mechanical treatment followed by the application of a systemic herbicide. Operating drills or saws and other mechanical equipment require electric power supply which is not readily available in many invaded sites, notably shrubslands and woodlands. In two study sites, we evaluated control obtained by glyphosate through a stem-injection technique and c…
La nuova disciplina del contratto di godimento in funzione della successiva alienazione immobiliare
2014
L'art. 23 del d.l. 12-9-2014, n. 133, c.d. «Sblocca Italia», introduce la figura del rent to buy, con cui mediante un contratto di godimento si realizza un programma preparatorio a una successiva alienazione immobiliare. L'esame degli aspetti disciplinati - prima dell'entrata in vigore della legge di conversione - rivela a contrario l'ampio spazio riservato all'autonomia privata, che nonostante qualche criticità conferma l'appetibilità del nuovo modello contrattuale.
Social Media as Public Sphere: A Stakeholder Perspective
2016
Purpose This paper aims to examine major stakeholders’ communication preferences in eParticipation initiatives and discuss how this affects the public sphere. Despite the potential of social media, it has proven difficult to get people actively involved in the decision-making processes. There is a need for more research on how stakeholders manage and use social media to communicate. Design/methodology/approach The study was conducted as a qualitative case study. Data sources include interviews, social media content, document analysis and field notes. Findings Communication preferences of stakeholders vary according to their salience level. Stakeholders with higher salience are less likely …
Don't Tell Us: The Demand for Secretive Behaviour
2009
The matter studied here is how, and with what implications, people may decide that they do not want to be let into secrets that concern them. They could get the information at no cost but they refuse to know. The reasoning is framed in terms of principals and agents, with the principals assumed not to want to know the agents' secrets. For convenience, the context chosen for the exposition is mainly that of voters as principals and the government or the office-holders as agents. After some exploration of the motivations underlying the attitude of the principals, the paper focuses on the case when neither total secrecy nor total disclosure prevails. The demand for partial secrecy is analysed …
Luftverschmutzung als wichtiger Kofaktor bei COVID-19-Sterbefällen
2021
Zusammenfassung Hintergrund Die Sterblichkeit bei COVID-19 ist in Anwesenheit kardiopulmonaler Komorbiditäten erhöht. Luftverschmutzung ist ebenfalls mit einer erhöhten Sterblichkeit assoziiert, v. a. vermittelt durch kardiopulmonale Erkrankungen. Beobachtungen zu Beginn der COVID-19-Pandemie zeigten, dass die Sterblichkeit bei COVID-19 v. a. in Regionen mit stärkerer Luftverschmutzung erhöht ist. Ungeklärt ist der Einfluss von Luftverschmutzung für den Krankheitsverlauf bei COVID-19. Methode Es wurde eine selektive Literaturrecherche von Studien bis Anfang April 2021 in PubMed zum Zusammenhang von Luftverschmutzung und der COVID-19-Mortalität mit den Suchbegriffen „air pollution AND/OR COV…