86,637 research outputs found
I virus Influenzali
No full textvengono descritte le caratteristiche dei virus influenzali con particolare riguardo alla possibilità di drift e shift antigenico. In particolare la possibilità di trasmissione tra specie animali diverse e l'uom
Corrosion Properties of NdFeB Magnets Coated by a Ni/Cu/Ni Layer in Chloride and Sulfide Environments
No full textIn this study, the corrosion behavior of a permanent magnetic alloy, Nd-Fe-B, coated by a triple layer of nickel-copper-nickel was studied. The corrosion resistance was investigated by (i) flux tests, carried out at 90 °C in an atmosphere containing chlorides or at 70 °C containing sulfides, (ii) electrochemical impedance spectroscopy (EIS), and (iii) potentiodynamic polarization tests, carried out in solution at different temperatures (0-90 °C) containing chlorides or sulfides. The morphology and the composition of the samples and the corrosion products were analysed by optical microscopy and scanning electron microscopy, equipped with an energy dispersive x-ray detector. The magnetic properties were characterized by magnetic flow measurements. The flux tests indicated that the triple layer of coating provided a greater corrosion resistance in atmosphere containing chlorides than the one with sulfides. The potentiodynamic and the EIS tests showed that the corrosion rate increased with temperature. The magnetic properties of the sample remained unchanged after exposure to the aggressive environment
Relevance of soiltexture for root growth of oilseed rape and potential reduction of nitrate leaching.
No full textDetection of pathological lesions in slaughtered rabbits
No full textThe slaughterhouse is considered an important control point for the monitoring of rabbit diseases. In our
study, 59,440 rabbit carcasses were examined, but only 1% of pathological lesions were recorded at postmortem
inspection. Mainly affected were tegumentary, digestive and urinary systems. The most consistent
lesion was the subcutaneous abscess; nephritis, probably caused by Encephalitozoon cuniculi, was
also frequent. Pathological alterations of the liver, classified as “necrotizing hepatitis” and localized at the
caudate lobe, were observed for the first time
Diffusione di “Candidatus Phytoplasma Asteris” in colza
No full textOilseed rape (Brassica napus L. var. oleifera) is cultivated in about 25,000 Ha in Italy (ISTAT, 2009). The seeds are mainly employed for oil for the biodiesel production as well as for flour for animal feedings. During 2009 in Legnaro (PD) and 2010 in the same area as well as in Padova, Verona and Zevio (VR) oilseed rape production areas plants showing phytoplasma-like symptoms were observed. Witches’ broom, leaf malformation and with abnormal reddening, flowers with malformation and phyllody; in affected inflorescences only a small proportion of flowers set seeds that were shrivelling and not germinating. In May of the two years symptomatic samples were collected for nucleic acid extraction from shoots, midribs and petioles. Phytoplasma detection and identification were obtained with direct PCR using phytoplasma universal primers P1/P7, amplifying 16S rRNA and spacer region, followed by RFLP analyses with TruI and HhaI as restriction enzymes. All samples were positive and showed identical RFLP profiles with the two enzymes that were indistinguishable from the one of European aster yellows (16SrI-B) reference strain belonging to ‘Candidatus Phytoplasma asteris’. The same phytoplasma was reported in oilseed rape from Bertaccini et al. (1998) in the Czech Republic and from Maliogka et al. (2009) in Greece. In Italy after its first report (Rampin et al., 2010) it is slowly spreading. During the two years survey 51 cultivars of diverse genetic types (hybrids CHH, CHH semi-dwarf, CHL and free pollinates lines) and having diverse qualitative characteristics (LEAR and HEAR, with low and high content of erucic acid respectively) were tested. Among those 31 showed the above described symptoms with incidences ranging from 0.03% to 1.89%. The phytoplasma diffusion seems not to be influenced by fertilization, while the number of seeds per square centimetre appears to influence its spreading. In all examined fields a gradient of disease from filed borders toward the centre was observed leading to the hypothesis of important activity of insect vectors. Aster yellows phytoplasma is naturally transmitted by different leafhoppers such as Euscelidius variegatus (Kirschbaum), Euscelis incisus (Kirschbaum), Macrosteles quadripunctulatus (Kirschbaum), Macrosteles quadrilineatus (Forbes) and Macrosteles laevis (Ribaut) all quite commonly present in the Padano-Veneto agricultural areas
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