471 research outputs found
Biodiversity in Porto Paone, Nisida. Characterization of Meiobentos Community
No full textNisida is a volcanic islet of the Flegrean Islands archipelago (A Zone of the Campi Flegrei Regional Park). It lies very close to Cape Posillipo, just north of Napoli and it is now connected to the mainland by a stone bridge. The islet has a circular shape, with a flooded crater forming the bay of Porto Paone. In the 1800s Nisida was the site of a Bourbon prison, then an Italian state penitentiary, and, now, a reformatory for juvenile offenders. Since then the access to the island has been limited and this results in a very preserved area, but in the 1900 Nisida was encroached upon by the unsightly steel industry in Bagnoli effecting the state of health of marine community. The meiofauna (metazoans between 1000 and 45 microm) are a fundamental component of terrestrial, and marine benthic ecosystems, forming an integral element of food webs, and playing a critical role in nutrient recycling. The presence and the abundance of meiofauna taxa will give then an idea on the environmental status after the stop of industrial activity in 2002. Using a morphological approach (GIERE, 2009) we performed a meiofauna survey in Porto Paone, the natural bay of about 900 m2 on the southwest side of the islet. Sampling were made from January to June in 12 areas resulting by the division of Porto Paone bay in three concentric loops subdivided in quorters. In each areas we collected 4 samples trying to cover all kind of substrate present. The fauna, narcotized with MgCl2 at 7.0%, was then fixed and preserved in a 10% neutral formalin solution, previously added with Bengal Rose. The extraction, repeated three times, was performed by gradient centrifugation of Ludox AM-30 (d = 1.210), and filtering the supernatant by means of two sieves (1.0 and 0.063 mm) overlapped (Balsamo, Semprucci, & all, 2012). animals retained on the finer sieve were then identified to taxon. We found a discrete diversity resulting in the presence of 10 phyla representatives including very sensitive taxa like Tardigrada. Given that, to date, no data are available on the meiofauna in Porto Paone, beside an old report on the presence of a new Gastrotricha (Coull & Chandler, 1992), this work represent a starting point to monitor the environmental recovering of the Flegrean marine area
FIRST SURVEY OF MEIOFAUNAL COMMUNITIES IN PORTO PAONE, NISIDA
No full textNisida is a volcanic islet of the Flegrean Islands archipelago (A Zone of the Campi Flegrei Regional Park). It lies very close to Cape Posillipo, just north of Napoli and it is now connected to the mainland by a stone bridge. The islet has a circular shape, with a flooded crater forming the bay of Porto Paone. In the 1800s Nisida was the site of a Bourbon prison, then an Italian state penitentiary, and, now, a reformatory for juvenile offenders. Since then the access to the island has been limited and this results in a very preserved area, but in the 1900 Nisida was encroached upon by the unsightly steel industry in Bagnoli affecting the state of health of marine communities. The meiofauna (metazoans between 1000 and 45 μm) are a fundamental component of terrestrial, and marine benthic ecosystems, forming an integral element of food webs, and playing a critical role in nutrient recycling. The presence and the abundance of meiofauna taxa will give then an idea on the environmental status after the stop of industrial activity in 1992. Using a morphological approach (GIERE, 2009) we performed a meiofauna survey in Porto Paone, the natural bay of about 19000 m2 on the southwest side of the islet. Sampling were made from January to June in 12 areas resulting by the division of Porto Paone bay in three concentric loops subdivided in quorters. In each areas we collected 4 samples trying to cover all kind of substrate present. The fauna, narcotized with MgCl2 at 7.0%, was then fixed and preserved in a 10% neutral formalin solution, previously added with Bengal Rose. The extraction, repeated three times, was performed by gradient centrifugation of Ludox AM-30 (d = 1.210), and filtering the supernatant by means of two sieves (1.0 and 0.063 mm) overlapped (PFANNKUCHE and THIEL, 1988), animals retained on the finer sieve were then identified to taxon. Statistical analyses were performed with ANOVA. We found a discrete diversity resulting in the presence of many phyla representatives including very sensitive taxa like Tardigrada. Given that, to date, no data are available on the meiofauna in Porto Paone, beside an old report on the presence of a new Gastrotricha (BODEN, 1965), this work represent a starting point to monitor the environmental recovering of the Flegrean marine area
Experimental analysis of a new multipoint integrated-optic vibrometer
No full textA multipoint vibration sensor realized in integrated optics is presented. The sensor is composed of four optical heads that have been conceived for the simultaneous measurement of vibrations (in terms of displacement) in several points of a vibrating mechanical system with the aim of an industrial diagnostic. The system presented here is realized on small silicon chips (28 mm×28 mm) using integrated optic (IO) technology, each chip realizing a dual Michelson interferometer. The conditioning and acquisition system for the signal, based on an A/D conversion board is reported together with a brief description of the optical circuit. Experimental tests carried out on the sensor have provided maximum velocity and maximum operating frequency of the sensing system. Frequency response function tests carried out with a commercial single-point laser Doppler displacement sensor are reported in the present article together with the laboratory setup and test results. The network of vibration sensors in integrated optics, the object of the study, have proven to be capable of measuring the vibration displacement of varnished metal surfaces optically untreated with good accuracy (1% standard uncertainty on the instantaneous amplitude) in a frequency range 0–200 Hz with surface velocities up to 100 mm/s. Limitation of the data processing unit have been discussed for vibration frequencies higher then 200 Hz
Very late hepatic artery thrombosis after liver transplantation: a diagnosis with a misleading doppler ultrasonographic pattern
No full textWho cares about Director Independence?
No full textIn this article we have expanded the analysis of the new dataset we created in Santella, Paone, Drago (2005) which analysed and quantified corporate disclosure on directors formally identified as independent by the forty Italian Blue Chips. We find here a general low level of compliance with independence requirements for both financial and non-financial companies, particularly with regard to the two key independence criteria of not having too many concurring commitments and not having business relationships with the company or an associated company. We also find that financial companies show a lower level of compliance than non-financial ones and are connected with each other and with a few non-financial companies through networks of cross-directorships: two directors (one independent and one executive) who also sit at the same time on another company board. Finally, those non-financial companies that have a relatively fragmented shareholder structure tend to be characterised by higher levels of compliance and disclosure (but not always by lower levels of not compliance) than tightly-controlled non-financial companies, presumably because of sensitivity to a larger pool of small shareholders. Peculiarly, financial companies with fragmented shareholder structure tend to be characterised by low disclosure levels, although such companies are also subject to strong financial supervision.corporate governance; independent directors; interlocking directorships; empirical legal studies
Allylic: Amination of cyclohexene catalyzed by ruthenium complexes. A new reaction involving an intermolecular C-H functionalization
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A CIRCULARLY POLARIZED MEASUREMENT VISION SYSTEM FOR ATTENUATION OF REFLECTION AND GLARE
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