Search results for "biologia generale"
showing 10 items of 319 documents
The paradox of the alien plant Leucaena leucocephala subsp. glabrata (Rose) S. Zárate in Sicily: another threat for the native flora or a valuable re…
2020
With this contribution, an updated picture of the rapid expansion of Leucaena leucocephala subsp. glabrata in Sicily is provided. On the one hand, this is a quite worrying sign, as this woody species figures among the world’s worst invasive alien species. On the other hand, the species shows interesting potential for production purposes (for wood, biomass and for feeding livestock), also considering its nitrogen fixation ability. Consequently, the two opposite options to cope with this species, i.e. cultivation and control/eradication, should accurately take into account the possible uses as well as its invasive behaviou.
La small protein TrpM è coinvolta nel differenziamento morfo-fisiologico di Streptomyces coelicolor
Bacterial diversity in soils vulnerable to desertification
2019
Introduction Mediterranean soils are experiencing increasingly negative effects of climate change due to drought and extreme weather phenomena that negatively affect agriculture, already suffering social and economic constraints. The soil microbiota is recognized as key player in both diversity and productivity of terrestrial ecosystems and it is mandatory to include its role in sustainable agronomic management. The LIFE Project DESERT-ADAPT - Preparing desertification areas for increased climate change - (http://www.desert-adapt.it/) focuses on agricultural adaptation measures aimed at reverting ongoing desertification trends (while improving the socioeconomic conditions of farmers). In or…
Antibacterial and antitumoral activities of new organotin(IV)-Schiff bases derivatives
2018
This preliminary report shows eight complexes of triorganotin(IV): Ph3SnOH and (CH3)3SnOH with four chelating imines on new synthesis. Of these ligands, two are salen-like (four coordination sites, two imidic, two phenoxidic) [1], one is a tetradentate pyrrole derivative [2] while the fourth, a vita- min B6 derivative, is pentadentate [3]. Ligands have been characterized by means of FT-IR, UV-Vis, Fluorescence, 1H- and 13C-NMR, LC-MS ESI triple quadrupole; complexes by means FT-IR, 1H- and 119Sn-NMR, LC-MS ESI, using the isotopic distribution pattern as a discriminant [4]. Geometry and nature of coordination complexes have been also evaluated using the 119Sn chemical shifts. Solid-state syn…
Scienze Naturali
2017
Il corso è stato progettato per disporre di tutti gli argomenti previsti da programma ministeriale per il quinto anno dei Licei (Chimica organica, Genetica, Biochimica, Microbiologia, Biotecnologie e Scienze della Terra) in un unico volume. Gli argomenti proposti sono trattati in maniera organica, evidenziando i possibili punti di contatto tra le differenti discipline e abituando lo studente a sviluppare una concezione liquida del sapere. La didattica e la struttura proposte sono finalizzate alla conoscenza e alla comprensione dei fenomeni che contraddistinguono la materia, la natura, gli esseri viventi e l’uomo e l’ambiente nel quale vive e col quale interagisce. Il corso concorre alla cos…
Chemogenic versus biogenic synthesis of Selenium nanoparticles: a structural characterization
Among the plethora of available metal- and metalloid-based nanomaterials (NMs), selenium nanostructures (SeNSs) are one of the most interesting from an applicative perspective due to their intermediate properties between metals and non-metals, as well as their high biocompatibility. In this regard, the capability of microorganisms to biotransform toxic Se-oxyanions – i.e., selenite (SeO32-) and selenate (SeO42-) – into their less bioavailable elemental forms [Se(0)], mostly generating Se nanoparticles (SeNPs), represents as a useful and green alternative over chemogenic synthesis allowing to obtain highly thermodynamically stable NMs. However, their structural characterization, in terms of …
SIMBIONTI RADICALI DI ASTRAGALUS NEBRODENSIS (GUSS.) STROBL.
2013
Le leguminose spontanee mediterranee hanno un elevato potenziale nei processi di rinaturalizzazione di ecosistemi degradati o semiaridi poiché stabiliscono simbiosi radicali con batteri azoto-fissatori e funghi micorrizici i quali, agendo sinergicamente, avvantaggiano la pianta per la nutrizione e la resistenza agli stress. Astragalus nebrodensis è un arbusto perenne appartenente alla famiglia delle Fabaceae, endemico in Sicilia; i simbionti radicali di questa specie non sono noti. Gli obiettivi di questo studio sono stati: 1) l’analisi della diversità dei rizobi simbionti di Astragalus nebrodensis; 2) la valutazione dell’effetto dell’inoculo di rizobi da collezione e di funghi micorrizici …
Combining ecological engineering and plant conservation on a Mediterranean islet
2012
This paper reports the results of a bioengineering intervention within the Mediterranean Basin carried out at Lampedusa Island (Strait of Sicily) on the “Spiaggia dei Conigli”, the only sand shore of all Sicilian territory where the sea turtle Caretta caretta lays its eggs every year. The erosion of the steep slope over the beach itself caused sensitive changes in the grain size of shore’s sediment and reduced the area of the beach with fine sand suitable for C. caretta oviposition. In order to reduce surface water flow and to stop erosion, several bioengineering options were adopted using only native plant species to preserve local botanical heritage and to prevent the local extinction of …
Le scelte compiute
2015
In observance of the criteria stated in the previous section > and the studies carried out on the natural and agriculture heritage the intervention consistend on the plaintinf of some Lampedusa's spontaneous shrubs propagated by Lagambiente or by the nursery of the Regional Rural and Territorial Department of the Sicilian Region (formerly Regional Forestry Office Department). The plants that were planted were: Mastic (60), Periploca (36), Juniper (20), Myrtle (24), Olivastro (5), Carob (10), Caper (10). More complex is what has been done for the realization of the orchard. On the basis of investigations carried out as part of a research project of the RDP 2007/2013, Measure 214/2 Action A >…
The gut bacterial community of the red palm weevil Rhynchophorus ferrugineus (Olivier, Coleoptera, Curculionidae) larvae
2011
The red palm weevil (RPW), Rhynchophorus ferrugineus (Olivier, Coleoptera, Curculionidae) is the major pest of palm trees in the Mediterranean area. Damages are caused mainly by the endophytophagous larvae that consume the palm tender soft tissues making galleries and producing a wet “frass” with a characteristic fermented odour. The culturable bacterial community associated to the frass produced by RPW larvae inside Phoenix canariensis trees is mainly composed of facultative anaerobe gamma-proteobacteria that have their closest phylogenetic relatives in the gut microbiome of other endophytophagous and xilophagous coleopteran as bark beetles and other plant biomass-degrading insects (leaf-c…