1,721,012 research outputs found
Bioaccumulo di metalli nelle valve di Mytilus galloprovincialis in relazione all'accrescimento
No full textZooplankton assemblage diversity in the whale shark Rhincodon typus aggregation area of Nosy Be (Madagascar)
No full textZooplankton assemblage was studied during seasonal aggregation of the whale shark Rhincodon typus in Nosy Be Island, a hotspot area in the Mozambique Channel. Two different sampling sites were identified in the outer neritic zone: a Feeding area, where whale shark was commonly sighted, and a Control area, never frequented by R. typus. The aim was to investigate zooplankton variability, in terms of composition, biomass and size spectra, in the two areas. Mesozooplankton was collected vertically form 10 m depth to the surface, in November-December 2018-2019 in Control and Feeding areas. A total of 36 zooplankton samples were collected during both campaigns; two different size classes, <= 2 mm and >2 mm and biomass (dry and wet weights) were analysed. Taxonomic composition was performed on 12 samples collected each year. In Feeding and Control areas mesozooplankton composition was similar and mainly represented by Copepoda. Wet and dry weights were higher in Control area compared to the Feeding, with a significant contribution of organisms >2 mm. A decrease of the total number of individuals was recorded in 2019, compared to 2018, characterized by a decrease in copepod abundance (-10%). Biomass decreased of 36.4% in 2019 with respect to 2018, mainly due to a decrease of organisms >2 mm. Similar mesozooplankton assemblage was recorded in the Control and Feeding areas of whale shark, whereas a significant increase in mesozooplankton size in Control area, evidenced by the highest biomass of organisms > 2 mm, could be due to the absence of predators. A decrease of biomass observed in 2019 needs to be further monitored, but the lack of significant differences between mesozooplankton assemblage in Control and Feeding areas suggests a possibility of multiple prey sources. Analysis of prey/predator interaction is recom-mended for understanding feeding habits and abundance of whale sharks in tropical regions
Consumo di ossigeno quale indice fisiologico per la valutazione dello stress metabolico in mitili campionati e stabulati
No full textMEDICAL HISTORY AND THE RISK OF MULTIPLE-MYELOMA
No full textThe relationship between various diseases and immunisations and the risk of multiple myeloma was analysed using data from a hospital-based case-control study conducted in Northern Italy on 117 patients with multiple myeloma and 477 controls. Associations were observed for clinical history of scarlet fever (relative risk,RR = 2.0; 95% confidence interval, CI = 1.1-3.9), tuberculosis (RR = 2.3; 95% CI = 0.9-5.7) and BCG immunisation (RR = 3.0; 95% CI = 1.4-6.4). The relative risk was 1.8 (95%CI = 0.9-3.5) for episodes of Herpes zoster infection, but most of the excess cases occurred within 10 years of diagnosis, suggesting that this might have been an early manifestation of the disease. No association emerged for common childhood viral infections or any other immunisation practice. When various classes of infectious or inflammatory diseases were grouped together according to their aetiology, there was a significant positive association with chronic bacterial illnesses (RR = 1.8; 95% CI = 1.1-2.8), and the relative risk estimates increased with the numberof bacterial diseases. The trend in risk with number of diseases was significant (chi-1(2) = 4.5, P = 0.03). A negative association was found between allergic conditions and risk of multiple myeloma (RR = 0.6; 95% CI = 0.3-1.0)
Are monoalgal diets inferior to plurialgal diets to maximize cultivation of the calanoid copepod Temora stylifera?
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Bloom fitoplanctonici e presenza stagionale di squalo balena (rhincodon typus) lungo la costa di gibuti – golfo di Aden
No full textDuring a 5 days research expedition performed in January, some observations on a whale shark population were performed. Just 7 specimens have been observed and identified. This number of sharks is lower than that observed in previous reports in the same period for similar research efforts. Recent remote sensing studies showed summer phytoplanktonic bloom higher than in autumn, but no sharks have been recorded suggesting that the quantity of phytoplankton could be not linked with the presence of the whale sharks
COFFEE CONSUMPTION AND BLADDER-CANCER RISK
No full textThe relation between consumption of regular and decaffeinated coffee and other methylxanthine-containing beverages and bladder cancer was analysed in a case-control study in two different areas of northern Italy (555 cases and 855 controls). The multivariate relative risk (RR) adjusted for smoking, occupation and sociodemographic variables for coffee drinkers versus non-drinkers was 1.3 (95% CI 1.0-1.8). The RR was 1.2 for one cup of coffee per day, 1.4 for two, 1.5 for three and 1.4 for four or more (P = 0.05). RRs for current drinkers were 1.5 (0.9-2.4) for decaffeinated coffee, 0.9 (0.6-1.2) for tea, and 0.6 (0.3-1.4) for cola. With reference to duration of consumption of coffee, RRs were 1.2 for less than 30 years or 1.4 for 30 years or more. Coffee-related RRs were higher in the older age group and in ex-smokers. Among 105 cases and 338 controls who had never smoked, RRs were 1.9 for one or two cups per day, 1.8 for three and 1.5 for four or more (trend not significant). A higher prevalence of coffee drinking among bladder cancer cases than controls was confirmed, with no clear dose-risk relation
Zooplankton size structure in the Gulf of Tadjoura (Djibouti) during whale shark sighting: a preliminary study|Structure de taille du zooplancton du Golfe de Tadjoura (Djibouti) pendant l’observation de requins baleines: étude préliminaire
No full textZooplankton, collected in the Gulf of Tadjoura (Republic of Djibouti) during a cruise conducted to study the feeding behavior of the whale shark Rhincodon typus, was analyzed in terms of size class, abundance and species composition. This pilot study was aimed to better understand a possible correlation between mesozooplankton composition and size spectra, collected up to 10 m depth, and different feeding behaviour of R. typus. Our data indicate that holoplankton accounted from 93 to 100% of the total community, copepods represented more than 80% of the zooplanktonic community, with 14 copepod genera and 9 species. Our preliminary results suggest an association between suction feeding activity of R. typus and high abundance of small copepod species. Passive feeding was recorded during the lowest abundance of zooplankton, mainly composed by large chaetognaths and larvae of Belbezub hansenii belonging to the family of Luciferidae (Sergestids). These first results highlight the importance of analyzing the dimensional structure of mesozooplankton in the aggregation areas of whale shark and open up new and intriguing investigative approaches to better understand the biology of R. typus
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