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Search Results: 1 - 10 of 5462 matches for " Vanessa Bravo "
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Importancia da ingest?o de proteína na fase adulta para o sucesso de acasalamento dos machos de Ceratitis capitata Wiedemann (Diptera: Tephritidae)
Silva Neto, Alberto M da;Dias, Vanessa S;Joachim-Bravo, Iara S;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000200014
Abstract: the importance of the protein ingestion during the adult stage on the mating success of males of ceratitis capitata wiedemann was evaluated in experiments of laboratory and field cage. in laboratory, the effects of protein ingestion during the first four or 12 days of the male adult life was assessed by the following parameters: mating success (capacity of being chosen by the female) and the number of males that give out pheromonal signals. some experiments of mating success had been carried through with males in different ratios. in these tests, the number of males which had ingested protein (an unique male) was remained constant and the number of males fed without protein was gradually increased from 1:1 to 1:5. in the field cages, the mating success experiments were done using a 1:1 ratio. the results showed that the protein ingestion in the first four days of life did not influence any of the analyzed parameters. when the period of ingestion of protein was extended to 12 days, protein-fed males fed produced more pheromonal signals and had a higher mating success when at a 1:1 ratio in laboratory and field cage assays. in laboratory, females randomly chose males in any other tested ratio (1:2, 1:3, 1:4 and 1:5), indicating that the female may lose the perception to identify the male who ingested protein in the first 12 days.
Escolha de parceiro para acasalamento em Ceratitis capitata (Wiedemann) (Diptera: Tephritidae): influência do envelhecimento dos machos no sucesso de cópula
Silva Neto, Alberto M da;Dias, Vanessa S;Joachim-Bravo, Iara S;
Neotropical Entomology , 2009, DOI: 10.1590/S1519-566X2009000500002
Abstract: the objective of this study was to evaluate the effect of male ageing on male pheromone release and mating success of ceratitis capitata (wiedemann). the effects of male ageing on mating were evaluated on five and 21 d-old males by assessing their mating success (males chosen by a female for copulation) and the amount of males releasing the sex pheromone. the mating success was evaluated by using several ratios of young to older males by increasing the number of older males:young males from 1:1 to 5:1. the mating success of the 1:1 ratio was also evaluated in field cages. the evaluation of the mating success (in the 1:1 ratio) showed a clear preference of the females for young males. sex pheromone emission was much more common on young than older males. even in cases were older males were more abundant (ratios 2:1 and 3:1), females still chose the young males. however, females could not distinguish young from older males in ratios of 4:1 or 5:1. our data indicate that the ageing of c. capitata males has a considerable negative effect on their reproductive success, especially if they are found in a proportion any lower than 3:1.
Biological and behavioral aspects of two laboratory strains of Ceratitis capitata (Diptera: Tephritidae): The influence of periodic introduction of wild flies in the colony
Acta zoológica mexicana , 2009,
Abstract: the healthy maintenance of insects reared under laboratory conditions requires strategies to retain the natural characteristics of their life-histories traits. rearing strategies include artificial selection to laboratory conditions, hybridization with compatible strains, and supplying the colony with wild individuals. we compared behavioral as well as life-history aspects of two laboratory strains of ceratitis capitata wiedemann (diptera, tephritidae) that had either been reared for 15-20 years under laboratory conditions with or without introducing wild specimens (lab-pop and hybrid-pop, respectively). the parameters evaluated were: performance and food ingestion of immatures, adult size and longevity, female oviposition preference and fecundity, egg viability, and mating choice. analyses of these parameters were conducted under laboratory rearing conditions. the largest differences observed between the two strains were related to behavioral components: food ingestion rate at the larval stage and oviposition behavior. in general, lab-pop individuals were less selective and more adapted to the artificial diet than hybrid-pop individuals (diet consumption), but there were no significant differences between the two strains in terms of percentage of emergence, egg viability, adult size, fecundity, and mating choice. it is suggested that the use of hybrid strains is more appropriate than the use of strains without the incorporation of wild individuals, especially in studies that involve behavioral parameters, as hybrid strains behave very similarly to wild populations, according our previous studies.
Biological and behavioral aspects of two laboratory strains of Ceratitis capitata (Diptera: Tephritidae): The influence of periodic introduction of wild flies in the colony
Acta zoológica mexicana , 2009,
Abstract: El mantenimiento saludable de insectos criados en condiciones de laboratorio requiere estrategias que conserven características naturales de sus historias de vida. Las estrategias en cría de insectos incluyen selección, hibridación con linajes compatibles y suministro a la colonia con individuos silvestres. Para investigar este último punto, comparamos los aspectos comportamentales así como los aspectos de las historias de vida de dos colonias de laboratorio de Ceratitis capitata Wiedemann (Diptera, Tephritidae) que han sido criadas entre 15 y 20 a os en condiciones de laboratorio sin introducir ejemplares silvestres (Lab-Pop), o con introducciones ocasionales (Hybrid-Pop). Los parámetros evaluados fueron: el desempe o y la tasa de ingesta larval, el tama o y la longevidad de los adultos, la preferencia de oviposición y fecundidad de la hembra, la viabilidad del huevo, y la elección para el apareamiento. Se realizaron análisis de estos parámetros bajo condiciones de cría con una dieta artificial. Las mayores diferencias entre individuos de las dos colonias se registraron en variables comportamentales: tasa de ingesta larval y comportamiento de oviposición. En general, la colonia Lab-Pop fue menos selectiva y más adaptada a la dieta artificial que la colonia Hybrid-Pop (consumo de la dieta), pero no hubo ninguna diferencia significativa entre las dos poblaciones en el porcentaje de emergencia, la viabilidad del huevo, el tama o de los adultos, la fecundidad, y éxito en el apareamiento. Se sugiere que el uso de colonias híbridas es más apropiado al uso de colonias a las que no se les incorporan ejemplares silvestres, sobre todo en estudios que involucran parámetros comportamentales, dado que las colonias híbridas se comportan como las poblaciones silvestres, de acuerdo con estudios anteriores.
Crisis transnacional global en relaciones públicas: el caso Chiquita Brands
Giraldo-Dávila,Andrés Felipe; Botero-Montoya,Luís Horacio; Molleda-Medina,Juan Carlos; Bravo,Vanessa;
Palabra Clave , 2011,
Abstract: the cross-national conflict shifting theory is an analytical focus that helps to understand public relations from a cultural, ethical and political perspective where stakeholders exert pressure about the behavior of transnational corporations, especially in subsidiaries that operate in developing countries. this research project explores the issue of the transnational crisis generated by the case of chiquita brands, suspected of having sponsored paramilitary groups in colombia between 1997 and 2004. this study offers the results of a quantitative content analysis carried out analyzing the news content about this transnational crisis in major newspapers published in colombia and the united states. we analyzed a total of 146 news stories between march 1, 2007 and june 30, 2008, time in which this transnational corporation confronted a judiciary demand in the united states and developed corporative responses to face the crisis. the study was developed by a group of researches formed by professors and students of the school of communication at the universidad de medellín, colombia, and the college of journalism and communications at the university of florida, in the united states.
Crisis transnacional global en relaciones públicas: el caso Chiquita Brands
Andrés Felipe Giraldo-Dávila,Luis Horacio Botero-Montoya,Juan Carlos Molleda-Medina,Vanessa Bravo
Palabra Clave , 2011,
Abstract: La teoría sobre la crisis transnacional es un enfoque analítico que permite comprender las relaciones públicas desde una perspectiva cultural, ética y política, donde los diversos públicos ejercen presión frente al comportamiento de las transnacionales, especialmente en filiales o subsidiarias que operan en países en desarrollo.Explorar el tema de la crisis trasnacional generada a partir del caso Chiquita Brands, se alada de haber auspiciado a grupos paramilitares en Colombia entre 1997 y 2004, se constituye en el eje central del presente trabajo, el cual recoge los resultados de un análisis de contenido, de tipo cuantitativo, realizado a las noticias que sobre esta crisis transnacional publicaron los principales periódicos editados en Colombia y en los Estados Unidos.Este trabajo analizó un total de 146 noticias entre el 1 de marzo de 2007 y el 30 de junio de 2008, época en la que la transnacional enfrentó el caso en tribunales de Estados Unidos y emitió una serie de respuestas corporativas para enfrentar su crisis. El grupo de investigadores de este estudio colectivo fue integrado por docentes y estudiantes de la Facultad de Comunicación de la Universidad de Medellín y del Colegio de Periodismo y Comunicaciones de la Universidad de Florida.
Avifauna de la Reserva de la Biosfera Barranca de Metztitlán, Hidalgo, México Birds of the Biosphere Reserve Barranca de Metztitlán, Hidalgo, Mexico
Raúl Ortiz-Pulido,Jessica Bravo-Cadena,Vanessa Martínez-García,Doroteo Reyes
Revista mexicana de biodiversidad , 2010,
Abstract: El manejo y conservación de un área natural protegida depende en gran parte del conocimiento biológico que se tenga sobre ella. En este estudio se presenta el listado de las aves de la Reserva de la Biosfera Barranca de Metztitlán, Hidalgo, México realizado durante 7 a os de trabajo de campo y que incluye 271 especies. Las familias más ricas fueron Tyrannidae y Parulidae (24 especies cada una), Emberizidae (19), Icteridae (13) y Trochilidae (12). Se registran 117 especies como residentes, 88 migratorias, 34 ocasionales, 6 con poblaciones residentes-migratorias y 26 sin estacionalidad clara. Se observaron 16 especies abundantes, 67 comunes, 153 raras y 35 sin abundancia relativa clara. Los tipos de vegetación más utilizados por las aves son: matorral submontano (113 especies), bosque tropical caducifolio (97), bosque de tascate (96) y matorral crasicaule con dominancia de S. dumortieri (91). Los gremios alimenticios mejor representados fueron: insectívoro (235 especies), frugívoro (88) y granívoro (85). Con base en la normatividad mexicana, se registraron 17 especies bajo alguna categoría de riesgo y 32 con algún grado de endemismo. En la zona habitan cerca del 60% de las aves de Hidalgo y 27% de las de México, razón por la cual se sugiere que esta zona sea declarada área Importante para la Conservación de las Aves (AICA) en México. Management and conservation of natural protected areas depends critically on their biological knowledge. Herein we report a check-list of the Barranca de Metztitlán Biosphere Reserve, Hidalgo, Mexico. We registered 271 species. The families that include more species were Tyrannidae and Parulidae (24 species each one), Emberizidae (19), Icteridae (13) and Trochilidae (12). We recorded 117 resident species, 88 migratory, 34 transient, 6 with resident-migratory populations and 26 with status not clear. We registered 16 abundant species, 67 common, 153 rare, and 35 with undetermined abundance. The richest vegetation types were: submontane shrubland with 113 species, tropical deciduous forest with 97, Juniperus forest with 96, and crasicaule shrubland with Stenocereus dumortieri dominance with 91. The best represented gremials were: insectivorous (235 species), frugivorous (88), and granivorous (85). We found 17 species under some risk category according with the Mexican law, and 32 species possesses some endemic degree. In the reserve inhabit near of the 60% of the birds of the Hidalgo state and 27% of the Mexican birds. This region should be considered as an Important Bird Area in Mexico.
Chilean University Students’ Call for Participation and Engagement in What Matters to Them: Is It Possible to Achieve a Shared Decision Making Process in Education Policy?  [PDF]
Paulina Bravo, Baltica Cabieses
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326155
Abstract: Chile is facing one of its major intellectual revolutions in the last century: organised high school, college and university students have led the most salient educational reform since the one that took place during the dictatorship period. This phenomenon is a pacific revolution based on the power of sound, evidence-based, clear and robust ideas. The purpose of this short essay is to reflect some ideas on the conceptualisation of a shared decision making (SDM) process and how they could be transferred to the current students’ educational revolution in Chile. It provides a reflection on how SDM might concretely contribute to this educational reform and on what future steps could be taken to truly achieves a “participatory” democracy in Chile. According to the authors, this debate illustrates the extent to which the level of participation must rely not on particular individuals but on the establishment of a partnership between parties.
CCS Membrane Development at CIUDEN’s Technology Development Centre for CO2 Capture  [PDF]
Jose A. Gutierrez Bravo
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.612001
Abstract: CO2 concentration to the atmosphere has risen faster than ever in the last century. This is highly due to fossil fuel combustion which is the major anthropogenic CO2 source. Membrane technology is an important alternative for reliability, flexibility and economically competitiveness for Carbon Capture and Storage (CCS) processes. The use of membranes has applicability to CCS technologies mainly for CO2, O2 or H2 separation, although most of the membrane studies for CO2/O2 production have been carried out at laboratory scale and will require a step further for commercial scale. This paper will present current membranes R & D needs when applied to CCS systems and CIUDEN capabilities for membrane technological development and testing under real conditions. It covers from O2 separation membrane integration in the process, and applied to the oxy-combustion CO2 capture, to post-combustion technologies for membrane CO2 separation, tested under real conditions or H2 production catalytic-membranes through gasification. At CIUDEN CCS facility important membrane evaluations can be carried out for the module integration, testing of materials performance and behavior under real conditions.
La difícil y necesaria integración entre la atención básica y la salud mental en brasil
Dimenstein,Magda; Neves,Rosane; Paulon,Simone; Nardi,Henrique; Bravo,Omar Alejandro; de Medeiros Galv?o,Vanessa Almira Brito; de Sousa Severo,Ana Kalliny; Figueiró,Rafael;
Psicología desde el Caribe , 2010,
Abstract: the aim of this work was to analyze the integration of family health strategies, one of the cornerstones of brazil's basic healthcare system, with mental health policies in two healthcare units, one located in the city of porto alegre, and the other in natal. in order to do this, both interviews and focus groups were conducted with members of the two healthcare teams and, subsequently, a formation process, articulated to the permanent health education proposal, was implemented. in the analysis of the obtained data, it could be observed that among the members of the healthcare teams of both units two therapeutic strategies prevail, in face of cases considered as mental health type: the prescription of psychiatric medication and the referral to specialists. the bureaucratic procedures of the healthcare teams hinder the implementation of other kinds of strategies and interventions.
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