1,720,975 research outputs found
Bioremediation of Olive Oill Mill Wastewaters by Fungal (Trichoderma viride, strain 8/90) Sequencing Batch Reactor
No full textOlive oil mill wastewaters (OOMWs) still represent an important environmental problem due to the several difficulties which has to be faced for their disposal.The performance of a lab-scale Sequencing Batch Reactor (SBR) for olive oil mill wastewater (OOMW) treatment was investigated. The reactor, preliminarily filled with suspended solids free OOWM was inoculated with Trichoderma viride (strain 8/90) fungal biomass. Influent and effluent dissolved organic carbon (DOC), total suspended solids (TSS) and polyphenols concentrations were monitored. The obtained results showed that the steady state removal of the organic carbon was about 66%, whereas phenolic compounds were reduced by about 50%
Fungal based SBR: a Model Investigation in an Open Culture on the removal of glucose and on the effect of toxic compounds on the biomass
No full textAn investigation was performed to explore the capabilities of a filamentous fungus – Trichoderma viride, strain 8/90 - to aseptically grow in a glucose-fed Sequencing Batch Reactor system in extreme environmental conditions (pH 3.5). Microscopic investigations were carried out to assess fungal dominance in the open culture. Batch tests were carried out to characterize the ability of the biomass to resist to toxic shocks, in which gallic acid was dosed. The fungus showed a significant ability to grow and to remove all the organic load at the adopted feeding rate (2000 mgGlucose/l/d), attaining high biomass yields. Furthermore, it showed to be able to resist to concentrated (1 g L-1) gallic acid even though the biomass had not been exposed to it before. Further, the microbial biomass (about 2.5 gVSS L-1) was able to completely remove gallic acid in aerobic conditions in a timeframe of 12 h
Model Investigation of Fungal Activity on a Synthetic Biorecalcitrant Wastewater
No full textThe remediation of those effluents containing pollutants which are hard to be metabolized (biorecalcitrant) is becoming an increasingly important enviromental problem, due to the complex nature of many wastewaters. An example is the class of polyphenols. In this work, the capability of the fungus Trihcoderma viride to act as bioremediation agent for the treatment of a synthetic wastewater containing glucose, acetic acid and gallic acid (chosen as phenolic model pollutant) was characterized. The investigation was carried out in a Sequencing Batch Reactor (SBR) with a Hydraulic Retention Time of 5 d. No settling phase was operated as this work is intended to be only a model study focused on the metabolic biomass performance (i.e., the removal of pollutant from the liquor). After few days, the organic load was completely removed, including the depletion of gallic acid from the medium. Furthermore, a 0.57 yield (C- mmol based) was achieved, thus indicating the absence of inhibition phenomena
Olive Oil Mill Wastewater Treatment in a Bubble Column Sequencing Batch Reactor.
No full textOlive Oil Mill Wastewater (OOMW) is one of the most relevant environmental problem, due to the high organic load, the high concentration of polyphenolic compounds (which are toxic for bacterial biomass) and the low pH values (usally ranging from 4 and 5.5). Fungal biomass seemed to be particularly suitable to perform the biological treatment process of this wastewater as it can grow at very low pH values and tolerate and metabolize polyphenolic compounds. Thus, Trichoderma viride (a filamentous fungus) biomass was non-aseptically inoculated in a bubble column reactor (9 l working voume), that in the beginning was filled with a glucose solution in which a 10% of OOMW was present, in order to simultaneously allow biomass growth and to provide a prior acclimatization. Later on, the system was managed as a continuos reactor with a HRT of 1.8 d. A 35% COD and a polyphenols 30% removal were averagely observed within the effluent
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
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
- …
