44,807 research outputs found
NetPrlDE an integrated environment for developing and visualizing computer network protocols
No full textIn this paper we present NetPrIDE, an integrated development environment for designing, implementing and visualizing computer network protocols, which has primarily been used for teaching computer networks. NetPrIDE makes use of an abstract and formal notation to clearly and firmly specify a protocol: once the protocol has been specified and the network topology has been fixed, the implementation and the visualization of the protocol is performed in a completely automated way. Copyright 2005 ACM
Analisi quali quantitativa dei metaboliti secondari presenti nei frutti di gelso (Morus nigra) coltivato in Sicilia
No full textCar Stickiness: Heuristics and Biases in Travel Choice
No full textWe conduct a laboratory experiment to investigate the factors determining travel mode choice. Two different scenarios are considered. In the first scenario, subjects have to decide whether to commute by car or by metro. Metro costs are fixed, while car costs are uncertain and determined by the joint effect of casual events and traffic congestion. In the second scenario, subjects have to decide whether to travel by car or by bus, whose costs are determined by a different combination of chance and traffic congestion. Subjects receive feedback information on the actual travel times of both modes. We find that individuals show a marked preference for cars, are inclined to confirm their first choice and exhibit travel mode stickiness. We conclude that travel mode choice is subject to cognitive heuristics and biases leading to robust deviations from rational behaviour
Do collembola affect the competitive relationships among soil-borne plant pathogenic fungi?
No full textThe feeding preference of the collembolan Protaphorura armata in the presence of Fusarium culmorum and Gaeumannomyces graminis var. tritici, two soil-borne fungi pathogenic for winter cereals, was studied in a simplified experimental system including wheat seedlings. Analysis of gut content of all animals from microcosms containing inoculum of both fungi showed that F. culmorum was clearly preferred but that G. graminis var. tritici was also fed. At microscopic examination the majority of F. culmorum conidia present in the gut lacked cytoplasmic content, and only few conidial cells were intact. The feeding preference of P. armata favoured G. graminis var. tritici over F. culmorum in the competition for infection sites on wheat plants; in fact, the former resulted the prevalent cause of plant disease. The viability of fungal propagules after passage through the gut of P. armata was also studied. No colonies of G. graminis var. tritici and only a few colonies of F. culmorum developed from faecal pellets set on agar medium. Fungal propagules dispersed by springtails were not sufficient to induce disease, as demonstrated by introducing animals, previously fed on fungal cultures separately, into microcosms containing a sterile substrate where wheat kernels were seeded. & 2004 Elsevier GmbH. All rights reserved
La comunicazione sentimentale: Laurence Sterne e il Settecento inglese
No full texta cura di P. Amalfitano, F. Fiorentino e G. Merlin
Magmatism from Mesozoic to Present: petrogenesis, time-space distribution and geodynamic implications
No full textRhino-oropharingeal osteoradionecrotic soft-tissue and bony defect reconstruction with submental artery island flap: a case report
No full textBackground: The submental artery island flap is widely used in head and neck reconstruction, since it is easy and quick to harvest, and it can be successfully used for the coverage of perioral, intraoral and facial defects. We used this technique for the reconstruction of a complex soft-tissue and bony defect of rhino-oropharinx. Case report: Osteoradionecrosis of rhino-oropharingeal posterior wall with C2 necrotic body exposure occurred in a 77-year-old woman. After the failure of reconstruction with a Hadad-Bassagasteguy flap, a submental island flap with cervical spine stabilization was planned to be performed in a one-stage operation. The anterior arc of C1 and odontoid process of C2 were removed and, according to the defect size, a submental island flap was designed in an elliptical fashion. The flap was rotated 180° and tunnelized under the left parapharingeal-prevertebral space, then it was positioned in the rhino-oropharinx and fixed with reabsorbable sutures. The donor site was closed primarily. No peri- or post-operative complications occurred, neither in the recipient nor in the donor-site. At the latest follow-up, 15 months postoperatively, the patient was able to speak without any impairment and started swallowing rehabilitation with good results and an aesthetically satisfactory outcome. Conclusion: The submental island flap may be a reliable and versatile flap for reconstruction of head and neck defects, even though in the rhino-oropharingeal posterior wall
[Modulation using racemic and levo-rotary baclofen of the trigeminal reflex in man].
No full textBaclofen (Lioresal), a muscle relaxant, exerts a specific action on the trigeminal system by depressing excitatory synaptic transmission in the spinal trigeminal nucleus. To evaluate the effects of racemic and L-baclofen on the human trigeminal reflexes, the area of the blink reflex was measured in seven normal subjects, before and after i.v. administration of racemic baclofen (25 mg.) and oral administration of L-baclofen (15 mg.). The blink reflex is a trigeminal facial reflex consisting of two components (R1 and R2): R1 has a shorter latency and is mediated by an oligosynaptic pontine circuit; R2 has a longer latency and is believed to be relayed via a polysynaptic circuit through the lateral bulbar reticular system. Whereas the R1 response was scarcely affected by administration of racemic baclofen, it was significantly reduced by L-baclofen (P less than 0.01). R2 was depressed by both drugs (P less than 0.01). These results indicate that both racemic and L-baclofen inhibit trigeminal transmission in man, probably because they interfere with excitatory transmission through the interneurons of the lateral reticular formation. In addition, since L-baclofen reduced both R1 and R2 this form of the drug presumably has a more powerful effect than its racemic counterpart, on the few interneurons of the short latency component
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