1,720,963 research outputs found
Microalgae production in olive mill wastewater fractions and cattle digestate slurry: Bioremediation effects and suitability for energy and feed uses
No full text: The possibility of obtaining energy or nutritive streams and bioremediation as an add-on opens new perspectives for the massive culturing of microalgal biomass on waste waters generated by the agro-food sector. Ordinary revenue streams are fully preserved, or even boosted, if they are used in microalgal cultivation; however, the suitability of wastewaters depends on multiple nutritional and toxic factors. Here, the effect of modulating the Olive Mill Wastewater (OMW) and cattle digestate (CD) fraction in the formulation of a growth medium on biomass accumulation and productivity of selected biomass fractions and their relevance for biofuel and/or feed production were tested for the microalga Scenedesmus dimorphus and for the cyanobacterium Arthrospira platensis (Spirulina). Tests highlighted the strong S. dimorphus adaptability to digestate, as on OMW, compared to A. platensis, with the maximum lipid storage (48 %) when culture medium was composed by 50 % of cattle digestate
Anaerobic co-digestion effluent as substrate for chlorella vulgaris and scenedesmus obliquus cultivation
Full text linkAnaerobic digestate supernatant can be used as a nutrient source for microalgae cultivation, thus integrating phytoremediation processes with high value products storage in microalgae biomass. Microalgae are able to use nitrogen and phosphorous from digestate, but high nutrient concentration can cause growth inhibition. In this study, two microalgae strains (C. vulgaris and S. obliquus) were cultivated on the anaerobic co-digestion supernatant (obtained from the organic fraction of municipal solid waste (OFMSW) and waste activated sludge (WAS)) in a preliminary Petri plate screening at different dilutions (1:10 and 1:5) using a synthetic medium (ISO) and tap water (TW). Direct Nile red screening was applied on colonies to preliminarily identify hydrophobic compound storage and then a batch test was performed (without air insufflation). Results show that C. vulgaris was able to grow on digestate supernatant 1:5 diluted, while Nile red screening allowed the preliminary detection of hydrophobic compound storage in colonies. The analysis carried out at the end of the test on ammonia, phosphate, nitrate and sulphate showed a removal percentage of 47.5 ± 0.8%, 65.0 ± 6.0%, 95.0 ± 3.0% and 99.5 ± 0.1%, respectively
Evaluation of wine lees ultrasonic cavitation as pre-treatment and its possible use as substrate for microalgae biomass production
No full textUltrasonic cavitation is a technology used to improve organic carbon solubilization of a substrate, increasing its biodegradability for further biological treatment. Moreover, its application has a pasteurization effect on waste stream. In this study, different cavitation times (5, 10, 20 and 30 min) are tested on white and red wine lees to evaluate the organic compounds solubilization, physical-chemical variation and antimicrobial cavitation effects, with the aim of further valorization with biotechnological applications such as microalgae growth. Wine lees cavitated effluents are applied as substrate for Chlorella vulgaris growth, obtaining a microalgae-yeast microbial community biomass of 2.4 ± 0.7 g L−1 (WL) and 1.7 ± 0.0 g L−1 (RL) with 33.9 ± 4.1 % (WL) and 60.5 ± 5.3 % (RL) of lipids content. Ultrasound cavitation is efficient in controlling native microorganism proliferation (yeast and mold) only applying at least 10 min of pretreatment. This pretreatment allows to change chemical-physical and microbiological properties of wine lees, that are compatible as organic substrate for microalgae cultivation in a circular economy approach
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
Coupling anaerobic co-digestion of winery waste and waste activated sludge with a microalgae process: Optimization of a semi-continuous system
No full textThe possibility of obtaining energy or nutritive streams and bioremediation as an add-on opens new perspectives
for the massive culturing of microalgal biomass on waste waters generated by the agro-food sector. Ordinary
revenue streams are fully preserved, or even boosted, if they are used in microalgal cultivation; however, the
suitability of wastewaters depends on multiple nutritional and toxic factors. Here, the effect of modulating the
Olive Mill Wastewater (OMW) and cattle digestate (CD) fraction in the formulation of a growth medium on
biomass accumulation and productivity of selected biomass fractions and their relevance for biofuel and/or feed
production were tested for the microalga Scenedesmus dimorphus and for the cyanobacterium Arthrospira platensis
(Spirulina). Tests highlighted the strong S. dimorphus adaptability to digestate, as on OMW, compared to
A. platensis, with the maximum lipid storage (48 %) when culture medium was composed by 50 % of cattle digestate
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