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Search Results: 1 - 10 of 4620 matches for " Fabiola; Vila "
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CYCLOTELLA OCELLATA PANTOCSEK (BACILLARIOPHYCEAE): PRIMERA CITA EN CHILE Y COMENTARIOS SOBRE SU VARIABILIDAD MORFOLOGICA
Rivera,Patricio; Cruces,Fabiola; Vila,Irma;
Gayana. Botánica , 2003, DOI: 10.4067/S0717-66432003000200007
Abstract: cyclotella ocellata pantocsek is reported for the first time from the chilean freshwaters, found in a sample collected in rapel reservoir (34o02's, 71o35'w). a description of the species and comments on its morphological variability are given
PRIMERA CITA DE STEPHANODISCUS AGASSIZENSIS HAKANSSON & KLING (BACILLARIOPHYCEAE) EN CHILE
Rivera,Patricio; Cruces,Fabiola; Vila,Irma;
Gayana. Botánica , 2002, DOI: 10.4067/S0717-66432002000200005
Abstract: stephanodiscus agassizensis hakansson & kling (stephanodiscaceae) is reported for the first time from chilean waters. the species was found in a sample collected in lake chungará (18°14's, 69°09'w), and the material is deposited in the diatom collection of the university of concepción, chile. photographs taken under light and scanning electron microscopes show the principal morphological features of this taxon
PRIMERA CITA DE STEPHANODISCUS AGASSIZENSIS HAKANSSON & KLING (BACILLARIOPHYCEAE) EN CHILE FIRST RECORD OF STEPHANODISCUS AGASSIZENSIS HAKANSSON & KLING (BACILLARIOPHYCEAE) IN CHILE
Patricio Rivera,Fabiola Cruces,Irma Vila
Gayana. Botanica , 2002,
Abstract: Se se ala por primera vez para Chile a Stephanodiscus agassizensis Hakkansson & Kling (Stephanodiscaceae). La especie fue encontrada en una muestra proveniente del Lago Chungará (18°14'S, 69°09'W), y el material analizado está depositado en la Colección Diatomológica de la Universidad de Concepción, Chile. Fotomicrografías obtenidas en los microscopios fotónico y electrónico de barrido muestran las principales características mor-fológicas de este taxón Stephanodiscus agassizensis Hakansson & Kling (Stephanodiscaceae) is reported for the first time from Chilean waters. The species was found in a sample collected in Lake Chungará (18°14'S, 69°09'W), and the material is deposited in the Diatom Collection of the University of Concepción, Chile. Photographs taken under light and scanning electron microscopes show the principal morphological features of this taxon
CYCLOTELLA OCELLATA PANTOCSEK (BACILLARIOPHYCEAE): PRIMERA CITA EN CHILE Y COMENTARIOS SOBRE SU VARIABILIDAD MORFOLOGICA CYCLOTELLA OCELLATA PANTOCSEK (BACILLARIOPHYCEAE): FIRST REPORT IN CHILE AND COMMENTS ON ITS MORPHOLOGICAL VARIABILITY
Patricio Rivera,Fabiola Cruces,Irma Vila
Gayana. Botanica , 2003,
Abstract: Cyclotella ocellata Pantocsek es se alada por primera vez para las aguas continentales de Chile, encontrada en una muestra recolectada en el embalse Rapel (34o02'S, 71o35'W). Se entrega una descripción de la especie y comentarios relacionados con su variabilidad morfológica Cyclotella ocellata Pantocsek is reported for the first time from the Chilean freshwaters, found in a sample collected in Rapel reservoir (34o02'S, 71o35'W). A description of the species and comments on its morphological variability are given
Antioxidant activity of Bios-p peptide analogue in HEK293T cells and three-dimensional structure prediction  [PDF]
Pamela Fernández Manzano, Ignacio Jofré Fernández, Fabiola Zambrano, Patricia Navarrete Gómez, Magdalena Cuevas Troncoso, Ximena Romo Marty, Andrés ávila Barrera, Fernando Romero Mejía
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.41008
Abstract: Studies had indicate that excessive production of reactive oxygen species (ROS) affect cellular signaling pathways, which is associated with pathological and physiological conditions such as cancer, diabetes and neurodegenerative diseases In this context, our laboratory has obtained the Bios-p, a ROS modulator, peptide analogue by sequencing from the seed of Bauhinia bauhinoides, which represents the active 12-amino acid, obtained from the inhibitor BbKI protease and we predicted the three-dimensional structure of Bios-p analogue peptide using homology modeling, being patented by the working group of Dr. Maria Luiza Vilela Oliva of UNIFESP, Brazil (a member of our cluster). The protective effect on the viability and antioxidant capacity of Bios-p was studied in HEK 293T cells under oxidative stress induced by hydrogen peroxide (H2O2) using SYTOXGREEN/DHE and luminescence assay. The three-dimensional structure of Bios-p peptide analogue was predicted by homology-based modeling using Modeller9v8. The pretreatment with different concentrations of Bios-p (1 μM - 10 μM) showed an increase of 53.83% ± 3.86% the cellular viability in under oxidative stress compared to control. Furthermore, the results to indicate that HEK293T cells by incubating for 24 h with Bios-p shown a significant decreased of basal extracellular ROS on total cell population in 89.67% ± 0.76%, compared to control in the absence of the analogue. Similarly it is observed that Bios-p has a significant antioxidant effect on extracellular ROS production when cells are subjected to oxidative stress induced by 200 μM H2O2 in 64.37% ± 4.63%, compared to control in absence of H2O2 and Bios-p. These results suggest that Bios-p has potential as antioxidant agent in cells HEK293T under H2O2-induced oxidative stress and that can protect the cells viability as concentration-dependent, and we propose a new biotechnological tool for modulate the ROS production.
Using an Interactive Computer System to Support the Task of Building the Notions of Ratio and Proportion  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2010, DOI: 10.4236/ce.2010.12017
Abstract: This article describes the design and general outcome of applying a computer system that includes interactive activities to the topics of ratio and proportion. The work was undertaken with Mexican students attending primary school grade six (11 year olds). In designing the activities, our work was based on the studies of researchers who have focused on such topics, as well as on the work of researchers in the field of computer sciences and education technology. Support of the activities designed is found in psycho-pedagogy, in knowledge of mathematics and in the fields of computer sciences and education technology.
Representation Registers in the Solution of Calculus Problems  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23036
Abstract: This article is derived from the research project registered under number 20110343 (Ruiz, 2011), and developed in Escuela Superior de Cómputo del Instituto Politécnico Nacional (IPN) (School of Computer Sciences of the National Poly-technical Institute of Mexico). The article reports on the problems found among Engineering students with respect to their resistance to using different representation registers when solving optimization problems in the Calculus Learning Unit. Use of such registers could help the students to build mathematics know ledge and to solve calculus problems. As a didactic strategy, simulations are used in an electronic environment in order to support the students by fostering their use of tabular, graphical and algebraic representation registers. Interviews are undertaken of six of the professors who give the calculus courses, and a diagnostic questionnaire is applied to 68 students prior to and after working with the proposal. As for the theoretical framework, the work reported by Duval and Hitt is salient in this report, particularly their emphasis of the fact that working on activities by way of one single representation system is not sufficient. From the first responses provided by the students, one can conclude that the algebraic register is preferred by the majority of students. It is however used in a mechanical fashion without affording any meaning to the content of the problem and to the process of solving it. Another conclusion reported is that implementing tasks in the classroom in which the mathematics activity requires coherent use of different representations is necessary.
Primary and Secondary Teachers’ Knowledge, Interpretation, and Approaches to Students Errors about Ratio and Proportion Topics  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23035
Abstract: This study investigated elementary and secondary teachers’ understanding and pedagogical strategies applied to students making errors in finding a missing length in similar rectangles. It was revealed that secondary teachers had better understanding of ratio and proportion in similar rectangles than elementary teachers. While all secondary teachers solved the similar rectangles problems correctly, a large portion of elementary teacher struggled with the problem. In explaining their solution strategies, and even though similar strategies appeared both from elementary teachers and secondary teachers, a majority of secondary teachers pointed out the underlying idea of similarity, whereas less than half of the elementary teachers explained their reasoning for using ratios and proportion. This article is derived from the research project registered under number 20110343 (Ruiz, 2011), and developed in Escuela Superior de Cómputo del Instituto Politécnico Nacional (IPN) (School of Computer Sciences of the National Poly-technical Institute of Mexico)
A Cognitive Analysis When the Students Solve Problems  [PDF]
Elena Fabiola Ruiz Ledesma
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.34063
Abstract: The research reported in this paper shows an analysis of the cognitive process of students from the senior technical program on food technology, whom are asked to solve a contextualized event on systems of linear algebraic equations within the context of balance of matter in situations of chemical mixtures. The cognitive analysis is founded on the theories of Conceptual Fields and vents. For the analysis attention is focused on the representations carried out by students regarding the invariants in the schemes that they build when they face an event of contextualized mathematics. During the acting process of students emerge different types of representation which are appropriate to the context in which the research develops, with which a proposal for the classification of them.
Objeciones de Sen frente al enfoque de los bienes primarios de Rawls
Vethencourt,Fabiola;
EPISTEME , 2009,
Abstract: this article studies the objections raised by amartya sen against john rawls? view on primary goods, as well as the corresponding responses of the latter. it is sought to assess whether there is an irreconcilable position between both authors when referring to specific and fundamental matters of justice. through an interpretation of the arguments held by both authors, we found out that there is reconciliation between them after all. in fact, the horizon of analysis posed by sen represents a fundamental contribution to rawls? view on primary goods.
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