1,720,974 research outputs found
Tools and techniques for underwater archaeological sites documentation
No full textThe amount of data required for a virtual reconstruction of an underwater archaeological site requires automatic systems for collecting data, based on the use of robots and unmanned underwater vehicles, which can work for a long time, in a hostile environment, without risk to human operators and with acceptable costs. However, such systems have often to be driven by expert pilots, adding costs to the usual Data gathering campaigns. This paper shows solutions found through subsequent campaigns, thanks to the expertise of a multidisciplinary team and in collaboration with several research institutions. In particular, this work presents the added value of technology within the data collection process from underwater archaeological sites, describing an assisted guidance system for a MicroROV developed in order to help unskilled pilot. Results of 3D reconstructions from images taken during real field mission with the above technology are described. © 2013 MTS
Seed transmission of Fusarium oxysporum f.sp. basilici in sweet basil
No full textThree different agar media were compared on 13 commercial seed samples of sweet basil to detect Fusarium oxysporum. Komada medium shows a restricted growth of many fungi but only F. oxysporum and species within the Liseola section grow slightly faster and sporulate. Most F. oxysporum colonies were recognizable under the stereomicroscope after training. Komada medium was, therefore, chosen for testing. Out of 21 commercial samples, suspected of harbouring the pathogen, 14 resulted infected and 8 internally infected. Five of these latter gave rise, after sowing, to infected plants demonstrating the seed to plant transmission of the inoculum in commercial seeds. Sowing healthy seeds in soil where infected seed lots had previously been sown gave rise to infected plants supporting the role of infected seeds in soil contamination. Isolates of F. oxysporum from basil seeds were tested for pathogenicity. Most isolates tested (88.2%) belong to the f.sp. basilici but some were saprotrophs, in a few cases they represented the only Fusaria present on seeds. A seed health test based on the agar plate method can lead to the refusal of healthy seed lots actually contaminated by saprotrophic F. oxysporum. Artificial inoculations or VCG determination can furnish a correct identification of the pathogen but they are quite time consuming; a molecular identification of the forma specialis is therefore required
Monte argentario (GR). Cala dei Santi: Grotta dei Santi
No full textSi descrivono i risultati della prima campagna di scavo nel sito del Paleolitico medio di Grotta dei Santi (Monte Argentario - GR). Nel corso dell'inervento sono stati messi in luce alcuni livelli antropici che corrispondono con ogni probabilità a quelli descritti da A.Segre nella sua pubblicazione del 1959. Tali livelli hanno restituito industria litica e abbondanti resti faunistic
Alcune aspetti patogenetici di Fusarium oxysporum F. sp. PISI isolato da seme di pisello ed efficacia della concia con fungicidi sistemici
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