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Department of Life and Environmental Sciences - DiSVA
348
Total Impact Points
100
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Department of Information Engineering (DII)
149
Total Impact Points
96
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Publication History View all

  • [show abstract] [hide abstract]
    ABSTRACT: The paper gives an overall description of the breaking-wave celerity on the basis of a wave-by-wave analysis that has been performed by using field data collected during the ECORS Project (Truc Vert Beach, France, 2008). Data coming from two pressure sensors have been analyzed with the aim to correlate, after a zero-crossing analysis, each wave of both signals. The method is based on a first correlation between 10′ time windows of both signals and, then, on the individuation of the correct time lag for each wave. Such data, which reveals a quasi-gaussian behavior of the breaking wave celerity, have also been used to relate the wave celerity with suitable wave characteristics, and comparisons are made with the most common formulas that can be found in the literature. The wave-by-wave method, validated by means of suitable laboratory test data, gives good results in the evaluation of the celerity, especially when it is made to depend on both a velocity scale and the wave non-linearity parameter. Further, a comparison with literature models used for the prediction of breaking wave celerity suggests good performances of both solitary-wave (correlation coefficient R^2 = 0.79) and shock-wave (R^2 = 0.71) theories, that give results well matched to the field data.
    Applied Ocean Research 06/2014; 46:15–27.
  • [show abstract] [hide abstract]
    ABSTRACT: Antioxidant defences play a central role in cell protection against a wide variety of environmental stressors, their variations being thus frequently studied to reveal oxidative stress conditions in fish. The Nrf2-Keap1 pathway is among the main mechanisms of transcriptional regulation in mammalians, but its involvement in modulation of antioxidant system of aquatic organisms is still largely unexplored. The present study focused on the identification of Nrf2 and Keap1 in the European eel Anguilla anguilla using liver slices as an in vitro model during an oxidative challenge. The mRNA levels of Nrf2, Keap1 and typical Nrf2 target genes (catalase, glutathione peroxidase 1 and glutathione S-transferase pi) were analyzed at different H2O2 exposure times to investigate the time course activation of these molecular responses. Obtained results showed a coordinated transcriptional regulation of CAT, GPx1 and GSTpi, also suggesting that Nrf2 de novo synthesis is required for the protracted induction of such antioxidant genes. Further, Keap1 variations would support its role in switching off these molecular responses, providing novel insight on the importance of the Nrf2-Keap1 pathway in the regulation of antioxidant genes in marine species.
    Aquatic toxicology (Amsterdam, Netherlands) 03/2014; 150C:117-123.
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    ABSTRACT: New observations on the life cycle stages of Ostreopsis cf. ovata are reported in the field and in cultures samples from the northern Adriatic Sea (Mediterranean Sea). Cultures of O. cf. ovata were performed using both replete and N-free growth media and analyzed for 5 months. Ostreopsis cells displayed a high morphological variability. Some cells were characterized by the presence of orange accumulation bodies, which represented a signal of stress conditions. Two mechanisms of gamete mating seem to occur. In the first (already reported) vegetative cells conjugated through the epitheca without plasmogamy; in this regard we observed a new ‘process’ on the top of the epitheca which might represent a structure involved in this mating mechanism. In the second, small cells acting as gametes were aligned laterally with the two cingula perpendicular to each other. Meiosis possibly occurred as suggested by tetrad formation, originating four vegetative cells. At least two types of cyst were formed, a non-dormant (pellicle) cyst germinating within 2 days and a resting cyst which is able to germinate after a 5-month dormancy only at temperatures over 25 °C.
    Harmful Algae 02/2014; 34:7–16.

Information

  • Address
    p.zza Roma, 22, 60121, Ancona, Italy
  • Head of Institution
    Sauro Longhi
  • Website
    www.univpm.it
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Journal of Engineering Mechanics 07/2009; 135(7):597-613.
435 Downloads
 
Computational Statistics & Data Analysis. 01/2008;
202 Downloads

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