1,720,978 research outputs found
Xantenes and porphyrins, photoactivatable molecules used to control insect pests
Full text linkSe analizaron dos sensibilizadores fotodinámicos, la Floxina B y la Hematoporfirina IX, como fotoinsecticidas de moscas plagas. Ambas sustancias adicionadas al alimento de las larvas presentaron alta toxicidad. La Hematoporfirina IX presentó una CL50 (0,086 mM) cinco veces menor que la obtenida para Floxina B (CL50: 0,46 mM). La Hematoporfirina IX presentó importante efecto tóxico durante la etapa de dispersión de la larva, no así la Floxina B, cuyo efecto recién se observó durante la metamorfosis. La etapa de dispersión de la larva es el único período del desarrollo postembrionario de las moscas en que los individuos están expuestos directamente a la luz solar. Como consecuencia de la fotoactivación, estas sustancias generan especies reactivas de oxígeno. Demostramos que estas sustancias producen un estado altamente oxidativo y verificamos un importante incremento en el contenido de lípidos peroxidados de larvas alimentadas con Hematoporfirina IX, aún en oscuridad.The photodynamic sensitizers Phloxine B and Hematoporphyrin IX were tested as photoinsecticides against pest flies. Both substances were found to be highly toxic when added to the food, and therefore they are good candidates for baits. Hematoporphyrin IX showed a LC50 (0.086 mM) five times lower than Phloxine B (0.46 mM). Hematoporphyrin IX, unlike Phloxine B, showed an important toxic effect during the larval dispersal period. In general, this is the only stage of postembryonic development of the flies in which the individuals are exposed to direct sunlight. Following photoactivation, these substances generate reactive oxygen species. We demonstrated that Phloxine B and Hematoporphyrin IX produce a highly oxidative state, and that, even in darkness, there is an increase of lipid peroxides in larvae fed with Hematoporphyrin IX.Fil: Pujol Lereis, Luciana Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquimicas de Buenos Aires; Argentina. Fundación Instituto Leloir; ArgentinaFil: Bochicchio, Pablo Alejandro. Fundación Instituto Leloir; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquimicas de Buenos Aires; ArgentinaFil: Rabossi, Alejandro. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fundación Instituto Leloir; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquimicas de Buenos Aires; Argentin
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
Phloxine B affects glycogen metabolism in larval stages of Ceratitis capitata (Diptera: Tephritidae)
Full text linkXanthene dyes have been tested as photoinsecticides on different dipteran species. Phloxine B ingested by Ceratitis capitata larvae showed low toxicity under dark conditions and acute light-dependent toxicity when the insects were exposed to light during the dispersion stage before pupariation. In this study we show that sub-lethal concentrations of Phloxine B generated subtle changes in weight gain and in the accurately regulated jumping behavior of metamorphosing larvae. These changes are correlated with a strong accumulation of glycogen in fat body, intestine and muscles, as well as with an inhibition of the glycogen phosphorylase activity. These results suggest that some of the non-phototoxic effects of Phloxine B might be caused by an alteration of the glycogen catabolism, which can eventually affect the viability of the flies.Fil: Berni, Jimena. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Rabossi, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Pujol Lereis, Luciana Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Tolmasky, Diana Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Quesada Allue, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentin
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
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
Consumo de agua durante la cría de mosca soldado-negra, Hermetia illucens
Full text linkIn a closed system with photoperiod, temperature and ambient humidity regulation, water consumption and the performance of BSF cultivation in three different organic substrates were evaluated during the entire productive phase of the black soldier fly (BSF) in the FAUBA insectary. Therefore, the water consumed to prepare the feed, to control the ambient humidity and for cleaning was quantified. Our results show that the main water consumption is related to the maintenance of insectary. We have established that the percentages of feeding moisture and ambient humidity are key factors for the \ndevelopment of this fly. The water consumption to produce 1 kg of BSF biomass was lower than the values reported in the literature for bovine, porcine or poultry production. \nOnce the key parameters for BSF production are well defined, production schemes can be put together that reduce the pressure on the planet's resources as much as possible, achieving increasingly sustainable production.Fil: Elena, Fernando. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Buenos Aires, ArgentinaEn un sistema cerrado con regulación de fotoperiodo, temperatura y humedad ambiente se evaluó el consumo de agua durante toda la fase productiva de la mosca soldado negra (BSF) en el insectario de la Facultad de Agronomía, Universidad de Buenos Aires (FAUBA) y la performance del cultivo de BSF en tres sustratos orgánicos distintos. Por lo tanto, se cuantificó el agua consumida para preparar el alimento, para controlar la humedad ambiente y para la limpieza. Nuestros resultados muestran que el principal consumo de agua está relacionado en el mantenimiento del insectario. Hemos establecido que los porcentajes de humedad del alimento y la humedad ambiente son factores claves para el desarrollo de esta mosca. El consumo de agua para producir 1 Kg de biomasa de BSF fue inferior a los valores reportados en la bibliografía para la producción bovina, porcina o avícola. La determinación de parámetros claves para la producción de BSF permite diseñar esquemas productivos que reduzcan la presión sobre los recursos del planeta, logrando una producción cada vez más sustentable.Magister de la Universidad de Buenos Aires en Gestión del Agu
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