1,721,007 research outputs found
Design, characterization, modeling and optimization of photobioreactors for microalgae cultivation and production of metabolites of technological-biological interest
No full textFil: Leonardi, Rodrigo Jorge. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina.La biotecnología aplicada al cultivo de microalgas crece a pasos agigantados, producto de que la composición de la biomasa puede ser adaptada a fines específicos, entre los más destacados, alimentación humana y abastecimiento de energía para garantizar la seguridad social. Si bien se cultivan microalgas a escala industrial, las productividades y eficiencias alcanzadas se encuentran muy por debajo de las teóricas, y las obtenidas en laboratorio. La energía radiante es considerada el factor más influyente en el crecimiento de organismos fotosintéticos, y es utilizada como parámetro en las etapas de síntesis y escalado de bioprocesos.
En la presente Tesis se propone estudiar los efectos de la calidad, la cantidad y la distribución de la radiación sobre la conducta de suspensiones de microalgas en fotobiorreactores. A través de ensayos de laboratorio, en condiciones de iluminación diseñadas y controladas, se puede obtener información (experimental y computacional, producto del modelado del campo de energía radiante) acerca de la conducta de las microalgas en sistemas de cultivo outdoor. Se dedica especial atención al desarrollo de herramientas predictivas, basadas en simulación computacional y cultivo en laboratorio, de la performance de reactores de mayor escala iluminados con luz solar, una energía renovable de costo nulo. Contar con metodologías de laboratorio rápidas y precisas, para estimar la productividad de cepas de microalgas en reactores varios, permite evitar gastos de tiempo y dinero asociados al diseño, puesta en funcionamiento y escalado de bioprocesos.Microalgae biotechnology has achieved significant advances over the last years, due to its interest as a source of molecules used in pharmaceutical, cosmetic and food industry, or alternative energy production. Although microalgae are grown at industrial scale at present, the productivity and efficiency achieved are well below than the theoretical ones, and those obtained at laboratory scale. Radiant energy is considered the most important factor for photosynthetics organism growth, and it is used as a key parameter in the scaling up stage of bioprocesses.
We studied the effect of light quality, quantity and distribution on microalgae growth inside photobioreactors. Under controlled lighting conditions, we could obtain experimental and computational information (by modelling of radiant energy field) about the behavior of microalgae in outdoor culture systems. We specially focused at predictive tools development to improve the large-scale reactors performance illuminated with sunlight. Fast and precise laboratory methodologies to estimate the productivity of microalgae strains in photobiorreactors avoids spending time and money for design, commissioning, and scaling up of bioprocesses.Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional del Litora
Design, characterization, modeling and optimization of photobioreactors for microalgae cultivation and production of metabolites of technological-biological interest
No full textFil: Leonardi, Rodrigo Jorge. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina.La biotecnología aplicada al cultivo de microalgas crece a pasos agigantados, producto de que la composición de la biomasa puede ser adaptada a fines específicos, entre los más destacados, alimentación humana y abastecimiento de energía para garantizar la seguridad social. Si bien se cultivan microalgas a escala industrial, las productividades y eficiencias alcanzadas se encuentran muy por debajo de las teóricas, y las obtenidas en laboratorio. La energía radiante es considerada el factor más influyente en el crecimiento de organismos fotosintéticos, y es utilizada como parámetro en las etapas de síntesis y escalado de bioprocesos.
En la presente Tesis se propone estudiar los efectos de la calidad, la cantidad y la distribución de la radiación sobre la conducta de suspensiones de microalgas en fotobiorreactores. A través de ensayos de laboratorio, en condiciones de iluminación diseñadas y controladas, se puede obtener información (experimental y computacional, producto del modelado del campo de energía radiante) acerca de la conducta de las microalgas en sistemas de cultivo outdoor. Se dedica especial atención al desarrollo de herramientas predictivas, basadas en simulación computacional y cultivo en laboratorio, de la performance de reactores de mayor escala iluminados con luz solar, una energía renovable de costo nulo. Contar con metodologías de laboratorio rápidas y precisas, para estimar la productividad de cepas de microalgas en reactores varios, permite evitar gastos de tiempo y dinero asociados al diseño, puesta en funcionamiento y escalado de bioprocesos.Microalgae biotechnology has achieved significant advances over the last years, due to its interest as a source of molecules used in pharmaceutical, cosmetic and food industry, or alternative energy production. Although microalgae are grown at industrial scale at present, the productivity and efficiency achieved are well below than the theoretical ones, and those obtained at laboratory scale. Radiant energy is considered the most important factor for photosynthetics organism growth, and it is used as a key parameter in the scaling up stage of bioprocesses.
We studied the effect of light quality, quantity and distribution on microalgae growth inside photobioreactors. Under controlled lighting conditions, we could obtain experimental and computational information (by modelling of radiant energy field) about the behavior of microalgae in outdoor culture systems. We specially focused at predictive tools development to improve the large-scale reactors performance illuminated with sunlight. Fast and precise laboratory methodologies to estimate the productivity of microalgae strains in photobiorreactors avoids spending time and money for design, commissioning, and scaling up of bioprocesses.Consejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional del Litora
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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