Search results for "GRAS"
showing 10 items of 727 documents
Mapping Posidonia oceanica lower limit combining high resolution instruments (SSS and MBS)
2014
The use of very high-resolution images for mapping of Posidonia oceanica reef
2020
Posidonia oceanica is an endemic Mediterranean seagrass that forms wide and dense meadows from the surface up to about 40 m depth. P. oceanica can develop on matte, a typical terraced structure built up by itself, consisting of intertwined rhizomes, roots and sediment, which may allow shoots to reach the sea surface, where may form typical reefs (récif barrière) considered “natural monuments”. These structures have received increasing attention for the potential ecosystem services they provide in protecting the coasts from erosion, forming new habitats (coastal lagoons) and contributing to carbon sink. P. oceanica reefs are particularly exposed to the expected increase in temperature and to…
Posidonia oceanica as a Historical Monitor Device of Lead Concentration in Marine Environment
2005
We show that Posidonia oceanica is able to reliably monitor the variability of environmental lead (Pb). We analyze lead concentration measured in the scales and rhizomes of Posidonia oceanica collected in seven sites along the coasts of the Sicily island and subsequently fractioned them according to a lepidochronological analysis. We measure lead concentration in Posidonia oceanica tissues by using the flame atomic absorption spectrophotometry technique. We compare the measured lead concentration with the estimated lead emission in air due to the gasoline sold and used for combustion in car engines in Sicily. By computation of the Pearson cross-correlation coefficient, we show that lead con…
Influence of hydrodynamic conditions on the production and fate ofPosidonia oceanicain a semi-enclosed shallow basin (Stagnone di Marsala, Western Si…
2004
An integrated approach using hydrodynamic and transport numerical models, lepidochronology and stable isotope analysis was used to investigate how local hydrodynamic conditions influence the primary production and fate of the seagrass Posidonia oceanica in a Mediterranean semi-enclosed marine system (Stagnone di Marsala). The water mass exchange aptitude of different sectors of the basin was analysed, and data collected were used to select two sectors (colonized by Posidonia oceanica showing the lowest and highest water exchange values) for biological analyses. According to the mean dispersal coefficient differences simulated by the hydrodynamic model, growth rate and primary production of …
Comparison of the fish assemblages associated with Posidonia oceanica after the partial loss and consequent fragmentation of the meadow
2005
An extensive Posidonia oceanica meadow was partially destroyed by excavation, resulting in areas of seagrass habitat of equal complexity (shoot density) but different heterogeneity (degree of fragmentation). The fish assemblages associated with differently fragmented beds were compared from a landscape perspective. Differences in the fish assemblages were detected, with several species showing different patterns: (1) species that increased their abundance along with the degree of bed fragmentation, (2) species that were more abundant in fragmented beds, but did not show differences between more or less fragmented beds, and (3) species that were mostly abundant in large seagrass patches or i…
Trace metals in “Posidonia oceanica” seagrass from south-eastern Sicily
2005
Heavy-metal concentrations were measured in sediments and tissues of Posidonia oceanica seagrass from south-eastern Sicily (Italy) in order to assess the degree of metal pollution in the coastal area. Seagrasses and sediments were collected at four sites along the south-eastern coast of Sicily. Flame atomic absorption spectrophotometry (FAAS) was used to measure concentrations of Cu, Zn, Cd and Pb. Standard statistical analyses were used to assess significant differences among the levels of the elements measured in different tissues and sediment and spatial distribution. The greatest values of potentially toxic metal concentrations were observed at the station near the industrial sites of A…
Caracterización de esteroles, lípidos polares, ácido siálico y gangliósidos en la alimentación del lactante
2017
La leche humana (LH) es el alimento idóneo para los lactantes durante los primeros 6 meses de vida y en su defecto, se recurre a preparados para lactantes (PL). A estos PL, con el propósito de asemejarlos a la LH, se le añaden ingredientes como aceites vegetales, membrana del glóbulo graso de la leche (MFGM), grasa láctea, etc., que aportan compuestos bioactivos (esteroles, fosfolípidos y esfingolípidos (lípidos polares –LP), ácido siálico (Sia) y gangliósidos (GG)), presentes de forma natural en la LH, con grandes efectos en los lactantes. El objetivo de este trabajo es, conocida la importancia del colesterol, LP, Sia y GG en la alimentación infantil, evaluar las posibles diferencias entre…
Power of Paradox: Grassroots Organizations’ Legitimacy Strategies Over Time
2021
Fringe stakeholders with limited resources, such as grassroots organizations (GROs), are often ignored in business and society literature. We develop a conceptual framework and a set of propositions detailing how GROs strategically gain legitimacy and influence over time. We argue that GROs encounter specific paradoxes over the emergence, development, and resolution of an issue, and they address these paradoxes using cognitive, moral, and pragmatic legitimacy strategies. While cognitive and moral strategies tend to be used consistently, the flexible and paradoxical use of pragmatic strategies has important consequences, both for GROs’ legitimacy and for their potential influence over powerf…
Phenols content and 2-D electrophoresis protein pattern: a promising tool to monitor Posidonia meadows health state
2007
Abstract Background The endemic seagrass Posidonia oceanica (L.) Delile colonizes soft bottoms producing highly productive meadows that play a crucial role in coastal ecosystems dynamics. Human activities and natural events are responsible for a widespread meadows regression; to date the identification of "diagnostic" tools to monitor conservation status is a critical issue. In this study the feasibility of a novel tool to evaluate ecological impacts on Posidonia meadows has been tested. Quantification of a putative stress indicator, i.e. phenols content, has been coupled to 2-D electrophoretic protein analysis of rhizome samples. Results The overall expression pattern from Posidonia rhizom…
Simone de Beauvoir on Sexual Difference
2018
In the introduction to The Second Sex, Simone de Beauvoir clarifies her philosophical approach to embodiment and sexual difference by writing: “However, it is said, in the perspective which I adopt—that of Heidegger, Sartre and Merleau-Ponty—that if the body is not a thing, it is a situation: it is our grasp upon the world and an outline of our projects.”