Search results for "Orella"
showing 10 items of 75 documents
Cultivation and biochemical characterization of isolated Sicilian microalgal species in salt and temperature stress conditions
2021
Abstract In the last years, the possibility to exploit autochthone microalgae in regional applications has been explored. The regional-based microalgal industry may bring several benefits, as autochthone microalgae are already adapted to the biotic and abiotic stresses of their environment. In this work, this concept was applied to Sicily, in which three microalgal strains were collected from the coastline. Monoalgal strains were then isolated and molecular characterization was performed for the species determination. Three of them, two strains of Chlorella and one of Dunaliella, were cultivated in lab-scale in four different conditions: Low Temperature-Low Salt (LT-LS), High-Temperature-Lo…
Non-hydrolysable macromolecular constituents from outer walls of Chlorella fusca and Nanochlorum eucaryotum
1992
Abstract Many green microalgae possess a thin trilaminar outer wall (TLS) with a very high resistance to chemical degradation. TLS are known to play an important protective role in living cells. They are also selectively preserved during fossilization and thus provide a major contribution to the fossil organic matter of a number of sedimentary rocks. However, little information is available on TLS chemical structure. Examination of the TLS of Chlorella fusca (a lacustrine Chlorophycea) and of Nanochlorum eucaryotum (a recently discovered marine Chlorophycea) indicated that (i) they exhibit morphological features commonly observed in other green microalgae, (ii) their non-hydrolysable macrom…
Population Dynamic of Algae and Bacteria in an Oxidation Channel
2003
A study on algae and bacteria population changes, as a function of time, was carried out in a pilot scale oxidation channel bioreactor using a carrousel system. Total Coliforms, Pseudomonas aeruginosa, and Streptococcus faecalis, the most common bacteria found in sewage, Scenedesmus obliquus and Chlorella vulgaris were the microalgae considered in this work. Physicochemical parameters such as COD, BOD, Chlorophyll a, nitrogen, and phosphorous compounds were studied and determined during the experiments. It was demonstrated that the level of wastewater contamination could be predicted based on the bacterial and algae composition. The relationships between the algae and bacteria population, a…
Assessment of cross-flow filtration as microalgae harvesting technique prior to anaerobic digestion: Evaluation of biomass integrity and energy demand
2018
[EN] In the present study, the effect of cross-flow filtration (CFF) on the overall valorization of Chlorella spp. microalgae as biogas was assessed. The effect of CFF on microalgae cell integrity was quantified in terms of viability which was correlated with the anaerobic biodegradability. The viability dropped as the biomass concentration increased, whereas anaerobic biodegradability increased linearly with the viability reduction. It was hypothesized that a stress-induced release and further accumulation of organic polymers during CFF increased the flux resistance which promoted harsher shear-stress conditions. Furthermore, the volume reduction as the concentration increased entailed an …
Biodiesel via in situ wet microalgae biotransformation: Zwitter-type ionic liquid supported extraction and transesterification
2017
The production of biodiesel derived from microalgae is among the most forthcoming technologies that provide an ecologic alternative to fossil fuels. Herein, a method was developed that enables the direct extraction and conversion of algal oil to biodiesel without prior isolation. The reaction occurs in aqueous media catalyzed by immobilized Candida antarctica lipase B (Novozyme 435). Zwitter-type ionic liquids were used as cocatalyst to improve the selectivity and reactivity of the enzyme. In a model reaction with sunflower oil, 64% biodiesel was obtained. Applying this method to a slurry of whole-cell Chlorella zof ingiensis in water resulted in 74.8% of lipid extraction, with 27.7% biotra…
Evolutionary priming and transition to the ectomycorrhizal habit in an iconic lineage of mushroom-forming fungi: is preadaptation a requirement?
2021
AbstractThe ectomycorrhizal symbiosis is an essential guild of many forested ecosystems and has a dynamic evolutionary history across kingdom Fungi, having independently evolved from diverse types of saprotrophic ancestors. In this study, we seek to identify genomic features of the transition to the ectomycorrhizal habit within the Russulaceae, one of the most diverse lineages of ectomycorrhizal fungi. We present comparative analyses of the pangenome and gene repertoires of 21 species across the order Russulales, including a closely related saprotrophic member of Russulaceae. The ectomycorrhizal Russulaceae is inferred to have originated around the Cretaceous-Paleogene extinction event (73.…
Con li suoi vestimenti asciugare il morto viso della salata acqua, e bagnarlo di molte lagrime: la "Fiammetta" en el "Leànder y Hero" de Roís de Core…
2005
The «Elegia di madonna Fiammetta» has an evident impact of the story of Leandre and Hero, especially in the moments in which the lady suffers while waiting for her lover, who never comes. Fiammetta makes obvious this parallelism on several occasions, and manages to invent an end for the story loaded of pathos. Joan Roís de Corella realises about this relationship between both two works and makes the inverse path: he uses the tone and some narrative elements of the Elegia for writing his Leander and Hero. It is demonstrated that the so contreversial end of Corella’s story is not original of the Valencian, but it also depends on Boccaccio’s text
Corella i el «Tirant»: qüestions d'intertextualitat
1998
The article points out that the presence of Corellian fragments in Tirant does not only affect his published works,but also those that were never printed and that must have been orally transmitted. The author finds evidence of oral performance, and of a constant amplifying and simplifying process of a hypo-text, which seems to reflect an ornamental, free and creative use of paragraphs that does not influence the narrative flow.
Variacions sobre el tema "Corella i els contemporanis valencians"
1998
The author provides data concerning the interrealtion between Corella's work and that of some of hiscontemporaries -precisely Ausiàs March, Joan Moreno and Bernat Fenollar-. He analyses in detail the jovial poem dedicated to Bernat del Bosch - a character here identified as historical, and executed for his homosexuality.
La literatura perduda de Joan Roís de Corella: les fonts
2008
The lost literature of an author provides data that, in spite of being partial, are important to better understand his preserved work and the complexity of his literary work. This article offers an approach to the losses experienced by Joan Roís de Corella’s literature down the centuries, in the full meaning of the term. It focuses on the analysis of the sources that supply information to establish a catalogue of these losses, as a starting point for subsequent work concerning the causes and periods of the disappearances.