1,721,162 research outputs found
Fig. 6 in Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs)
No full textFig. 6. Aldehydes production (nmol g 1) by Ulva cf. rigida at the different sampling times (data are mean ± st. dev. of 3 replicates).Published as part of Pezzolesi, Laura, Accoroni, Stefano, Rindi, Fabio, Samorì, Chiara, Totti, Cecilia & Pistocchi, Rossella, 2021, Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs), pp. 1-9 in Phytochemistry (112826) 189 on page 6, DOI: 10.1016/j.phytochem.2021.112826, http://zenodo.org/record/825937
Fig. 1 in Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs)
No full textFig. 1. Concentration (nM) of dissolved PUA (dPUAs) in seawater in August and September 2015.Published as part of Pezzolesi, Laura, Accoroni, Stefano, Rindi, Fabio, Samorì, Chiara, Totti, Cecilia & Pistocchi, Rossella, 2021, Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs), pp. 1-9 in Phytochemistry (112826) 189 on page 2, DOI: 10.1016/j.phytochem.2021.112826, http://zenodo.org/record/825937
Fig. 5 in Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs)
No full textFig. 5. Aldehydes production (nmol g 1) by Dictyopteris polypodioides at the different sampling times (data are mean ± st. dev. of 3 replicates).Published as part of Pezzolesi, Laura, Accoroni, Stefano, Rindi, Fabio, Samorì, Chiara, Totti, Cecilia & Pistocchi, Rossella, 2021, Survey of the allelopathic potential of Mediterranean macroalgae: production of long-chain polyunsaturated aldehydes (PUAs), pp. 1-9 in Phytochemistry (112826) 189 on page 6, DOI: 10.1016/j.phytochem.2021.112826, http://zenodo.org/record/825937
Algal food safety: Possible contaminations, challenges of harmonized quality assessments, and suggested recommendations for the nascent industry of microalgae-based products
No full textMicroalgae are valuable sources of human nutritional products, leading to growing interest in algae-based di
etary supplements. Research is still ongoing for high-value commodities from microalgae to cover the food
demands of the ever-increasing human population. Thus far, there is a dearth of comprehensive information
available on the safety of microalgae-based products (MP) for the food sector. Algal food safety (AFS) is a nascent
f
ield, and consequently, quality analysis has not been adequately explored; the lack of hygienic requisites is a
matter of concern for scientists, producers, policymakers, and consumers. In this review, we aim to provide the
available knowledge on the potential hazards, critical insights into the necessity of AFS, as well as quality control
(QC) and regulations. This paper briefly reviews bottlenecks at each step of the production process, from the pre-
cultivation to the storage stage. Plus, quality assessment criteria are discussed, including toxicological and
microbiological standards. Additionally, it describes the role of all stakeholders in the algal food industry.
Finally, we discuss a few suggested solutions to address the gaps in AFS
Photobioreactor cultivation and catalytic pyrolysis of the microalga Desmodesmus communis (Chlorophyceae) for hydrocarbons production by HZSM-5 zeolite cracking
No full textThe study evaluated the growth of Desmodesmus communis on column photobioreactor and its thermochemical treatment by catalytic pyrolysis using HZSM-5 zeolite. D. communis showed good results in terms of growth (0.05g L−1 d−1). Analytical pyrolysis of original algae and derived bio-oil mixed with zeolite was used as a screening method in order to gather information on the cracking process. Preparative pyrolysis on bench scale reactor was performed on algae biomass over a zeolite bed at 1:10 ratio (wt/wt). Py-GC–MS of biomass/catalyst mixture showed that the denitrogenation/deoxygenation increased with increasing zeolite load from 1:5 to 1:20 ratio and became significant at 1:10 ratio. The composition observed by analytical pyrolysis was featured by the predominance of alkylated monoaromatic hydrocarbons. The scaling-up to bench scale confirmed the results obtained with analytical pyrolysis in terms of monoaromatic hydrocarbons. However, low yield of catalytic oil (8% by weight) was observed
A new approach to assess the effects of oil spills on phytoplankton community during the “Serious Game” experiment (MEDESS-4MS Project)
No full textThe “Serious Game” experiment was focused on the development of an integrated monitoring approach to oil spill events in the Mediterranean Sea; it was carried out in the Northern Tyrrhenian Sea, an area that is reported to have intense marine traffic often connected to operational oil discharges. Our experiment was designed in order to develop a rapid assessment of oil spill effects on phytoplankton community through the integration of satellite imagery, in situ sampling and new low-cost technologies. In particular, satellite images were frequently acquired to monitor the study area. When the oil slick was detected, a real time sampling survey was carried out with the support of the Italian Coast Guards, employed as Voluntary Observing Ships for the identification of the polluted area, as well as for sampling and measuring activities. During the experiment, numerous analyses were carried out on the controls (C1, C5, E1, E5) and oiled (M1, M2, M4) stations to assess the most useful methods to quantify the impact of oil slick on the phytoplankton community. Among the numerous methods used, phytoplankton qualitative and quantitative evaluation was indispensable to appreciate subtle changes among the different phytoplankton groups; it is therefore a crucial analysis to observe the short negative effects of oil exposure on microalgae. In addition, the C:N ratio was shown to be a reliable parameter to evaluate the presence of oil compounds in the particulate fraction. Also the new low-cost technology used (the vertical profiler T-FLaPpro) was proved to be an efficient support to the rapid assessment of the oil impact along the water column
Outdoor production of Tisochrysis lutea in pilot-scale tubular photobioreactors
No full textIn this paper we study the outdoor production of Tisochrysis lutea in pilot-scale tubular photobioreactors (3.0 m3). Experiments were performed modifying the dilution rate and evaluating biomass productivity and quality, in addition to the overall performance of the system. Results confirm that T. lutea can be produced outdoors on a commercial scale in continuous mode, obtaining productivities of up to 20 g m−2 day−1 of biomass, which are rich in proteins (45 % d.wt.) and lipids (25 % d.wt.). The utilization of this type of photobioreactor allows one to control the levels of contamination and pH within the cultures, but daily variations in solar radiation impose elevated dissolved oxygen concentrations and insufficient temperature conditions on the cells inside the reactor. Excessive dissolved oxygen reduces biomass productivity to 68 % of that which is maximal, whereas inadequate temperature reduces it to 63 % of maximum. Thus, by optimally controlling these parameters, biomass productivity can be almost doubled. These results confirm the potential for producing this valuable strain on a commercial scale in optimally designed/operated tubular photobioreactors as a viable biotechnological industry
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
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