1,721,154 research outputs found
Fish assemblages in three Mediterranean coastal lagoons: structure, functioning and spatial-temporal dynamics
Full text linkQuesta ricerca, condotta nei Laboratori di Ecologia Sperimentale dell’Università di Tor Vergata, ha avuto come scopo quello di contribuire alla conoscenza della struttura e delle dinamiche degli assemblage ittici di tre lagune dell’Italia centro-meridionale, la laguna di Lesina (Puglia) e i laghi costieri di Fogliano e Caprolace (Lazio).
In ognuno degli ambienti lagunari, per un anno, sono stati compiuti campionamenti mensili della fauna ittica, utilizzando una trattina manuale con maglia di 2 mm. Le stazioni di campionamento sono state scelte tenendo conto principalmente della distanza dai canali di marea, della distanza dagli input d’acqua dolce, dei valori di salinità e della copertura vegetale.
Contemporaneamente sono stati anche misurati i principali parametri idrologici (temperatura, salinità, concentrazione dell’ossigeno disciolto, pH, ecc.) e sono stati prelevati dei campioni di acqua per l’analisi dei nutrienti. In laboratorio, i campioni sono stati smistati, e gli individui identificati a livello specifico e contati.
Le dinamiche spaziali e temporali degli assemblage ittici delle tre lagune sono state analizzate utilizzando diverse tecniche di analisi statistica multivariata.
I risultati hanno evidenziato come sia il grado di influenza marina che il grado di complessità ambientale abbiano giocato un ruolo primario nello strutturare gli assemblage ittici delle tre lagune indagate. In particolare, le caratteristiche morfometriche dei canali di marea sembrano influenzare sensibilmente sia la ricchezza specifica sia la struttura degli assemblage ittici, proponendosi come buoni descrittori abiotici della tipologia delle lagune costiere del Mediterraneo, da cui derivare le condizioni biologiche di riferimento nell’ottica dell’applicazione della Direttiva Europea sulle Acque (2000/60/CE).The fish assemblage structure and its spatial and temporal variations in Lesina Lagoon and in the coastal lakes of Fogliano and Caprolace, respectively located on the Adriatic and Tyrrhenian coasts of the Central-Southern Italy, were investigated for about a year. The stations chosen in each lagoon on the basis of their environmental characteristics were sampled once a month with a manual beach seine. Both taxonomical and functional aspects of the fish assemblage were analysed, and the patterns of fish spatial and temporal distributions in each lagoon were studied using multivariate statistical methods. Results evidence that the marine influence extent together to the environmental complexity plays a primary role in structuring the fish assemblages of these small lagoons. The implications for the management of the three lagoons and in the identification of key abiotic descriptors of Mediterranean coastal lagoons typology, such that reliable specific biological reference conditions can be derived were discussed
Diagnosis of polymyalgia rheumatica in primary health care: favoring and confounding factors - a cohort study.
Full text linkObjectives: To evaluate in a primary care setting the favoring and confounding factors for the diagnosis of polymyalgia rheumatica (PMR). Material and methods: Among 303 patients consecutively referred by their general practitioners (GPs) to our rheumatologic outpatient clinic, we identified three groups: group A - patients with confirmed diagnosis of PMR, group B - patients with unconfirmed diagnosis, group C - patients with unrecognized PMR. All the diagnostic confounding and favoring factors were discussed with GPs using an e-mail questionnaire. Participation in rheumatology training courses represented the final question. The collected data were statistically assessed in a blind way. In Fisher's exact test and ANOVA test, a p-value was significant if < 0.05. The study was carried out in compliance with the Helsinki Declaration and approved by the Ethics Committee of Mariano Lauro Hospital. Every patient signed an informed consent form at the time of the first visit. Results: All patients were Caucasian; 24.1% were male; mean age was 72.3 ±8.6 years (min. - 51, max. - 94). There were 41 patients in group A, 93 in group B and 169 in group C. The percentage of misdiagnoses was very high (87.1%): among 134 patients diagnosed with PMR by their GPs (group A + group B) confirmation was made in 41, and in 169 unrecognized PMR was found. Participation in training courses was very significant compared to the diagnostic accuracy (p < 0.0001 in χ2 test) and to the diagnosis timing (24.3 days ±12.5 vs. 42.9 ±15.5 with p-value < 0.05 in the ANOVA test). When the percentages were assessed according to participation, an inadequate evaluation of some clinical manifestations favored over-diagnosis among the trained GPs. Conclusions: The level of diagnostic accuracy for PMR must be improved in primary care. Participation in rheumatology training courses can be an important step
Detection of pH 4.6 insoluble beta-lactoglobulin in heat-treated milk and Mozzarella cheese
No full textDifferent protein aggregates including beta-lactoglobulin (beta-lg) were detected in the pH 4.6 insoluble fraction recovered from actual heat-treated milk samples by gel electrophoresis and immunoblotting. A competitive enzyme-linked immunosorbent assay (ELISA) using anti-beta-lg polyclonal antibodies was developed to analyze the beta-lg partition in the protein fractions obtained upon acidification of both milk and Mozzarella cheese at pH 4.6. According to ELISA determinations, nearly 90% of the pH 4.6 soluble beta-lg included in raw milk was found in the pH 4.6 insoluble fraction of ultrahigh temperature (UHT)-treated milk. As concerns Mozzarella cheese analysis, ELISA results indicated that about 36% of the total beta-lg milk content was transferred from pasteurized milk to Mozzarella cheese, whereas less than 0.5% was transferred from raw milk. The pH 4.6 insoluble beta-lg proved to be a suitable indicator of the intensity of the heat treatment applied to milk. The ELISA-based detection of this parameter was suggested for quality control of both drinking milk and raw milk cheese
Photoinduced random molecular reorientation by nonradiative energy relaxation: An experimental test
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Time-resolved and polarization-sensitive fluorescence and dichroism in absorbing liquids
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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