1,720,967 research outputs found
Symbiosis between marine invertebrates and bacteria: new frontiers in the ecological and medical field
No full textBIO2REMEDIATION®: A self-sustainable tool for the treatment of shallow polluted basins.
No full textBIO2REMEDIATION® is a patented technology jointly developed by Ca' Foscari University of Venice and SAPIO Industries. This technology aims to stimulate aerobic biodegradation of pollutants present into sediments; in particular, it involves forced oxygen supply to ensure the aerobic condition’s maintenance, to provide electronic acceptor versus endemic microbial communities required for biodegradation reactions and to create an adapt environment for the organic pollutant biodegradation. This is achieved through both sediments and overlying water column oxygenation through introduction of oxygen enriched water. BIO2REMEDIATION® was applied on the bottom of a shipyard dock called Arsenale Vecchio. It was a basin in Venice chosen for our experiment because of its limited size, shallow water and (nowadays) reduced boat traffic.
The study aim was to first assess the status quo of the chosen area treated with BIO2REMEDIATION®, in order to make a comparison with data collected prior to, ongoing and after two years the treatment. It affected both directly the abiotic component, consisting of the sediment, and indirectly, the overlying water compartment, everyone comprehensive of organisms, of course. Results clearly showed that the sediment after treatment has undergone a substantial change: a) a substantial decrease in organic pollutant content (where PAHs have been chosen as pollutant markers); furthermore, b) the creation of an oxidized surficial layer which can act as a > in respect of pollutants located in the lower (anoxic) part to step to the interface with the water. At the same time, this re-newed sediment can be a really helpfull substrate for biotic component re-engraftment.
At a macroscopic analysis, in fact, it is again verified high biodiversity.
In light of these considerations, it intends to conduct an audit of targeted requirements of self-sustainability of the ecosystem through qualification and quantification of the parameters below
Bioinertization strategy by Bivalves: A new challenging technique also for CO2 balance.
No full textAreas such as mangroves, salt marshes and seagrasses are known to be responsible for capturing and storing up to some 70 % of the carbon permanently stored in the marine system. The so called “Blue carbon” is thus emerging as another option for controlling climate change because of marine systems ability to sequester vast amounts of carbon dioxide and consequently to act as a carbon sink. In this optic it is important to better understand coastal ecosystem functioning and to quantify the contribution of the singular components in order to improve this ability. We focused our attention on a seagrass, i.e. the Venice Lagoon coastal transition environment, and we tried to estimates the importance of the role of living organisms in capturing atmospheric carbon dioxide and transform it in a storable form. First we considered the autotrophic component and its capacity to fix CO2 as organic matter photosyntheticaly; then, we tried to follow the flow of this carbon in the food web and in particular towards skeletal molluscan organisms.
On the other side it’s known that the crystalline calcium carbonate lattice is able to incorporate metals. This is the reason why Bivalves are extensively used in biomonitoring programmes being efficient accumulators of contaminants and ideal bioindicators. Various species have been used for assess toxic metals levels in marine environment but the most favourite ones are filter feeding Bivalves such as mussels and oysters. This skill could be used in future applications concerning the comprehension and the following exploitation of Bivalves role in water basin self-purification mechanisms.
The comprehension of the relevance of these mechanisms enable us to imagine a new challenging frontier: the exploitation of molluscan commercial production as a mean for carbon sequestration and pollutants bioinertization
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
PCR detection of enteric viruses in treated wastewater: adenoviruses as potential viral water pollution indicators
No full textVariations 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
Appropriate 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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