Página 1 dos resultados de 3188 itens digitais encontrados em 0.007 segundos

Identificação de genes em Chromobacterium violaceum relacionados à resposta ao estresse

Fontinele, Delanne Cristina Souza de Sena
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Biotecnologia; Biotecnologia Industrial; Biotecnologia em Agropecuária; Biotecnologia em Recursos Naturais; Biotecn Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Biotecnologia; Biotecnologia Industrial; Biotecnologia em Agropecuária; Biotecnologia em Recursos Naturais; Biotecn
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The sequencing of the genome of Chromobacterium violaceum identified one single circular chromosome of 4.8 Mb, in which approximately 40% of the founded ORFs are classified as hypothetical conserved or hypothetical. Some genic regions of biotechnological and biological interest had been characterized, e. g., environmental detoxification and DNA repair genes, respectively. Given this fact, the aim of this work was to identify genes of C. violaceum related to stress response, as the ones involved with mechanisms of DNA repair and/or genomic integrity maintenance. For this, a genomic library of C. violaceum was built in Escherichia coli strain DH10B (RecA-), in which clones were tested to UVC resistance, resulting in five candidates clones. In the PLH6A clone were identified four ORFs (CV_3721 to 3724). Two ORFs, CV_3722 and CV_3724, were subcloned and a synergic complementation activity was observed. The occurrence of an operon was confirmed using cDNA from C. violaceum in a RT-PCR assay. Further, it was observed the induction of the operon after the treatment with UVC. Thus, this operon was related to the stress response in C. violaceum. The mutagenesis assay with rifampicin after the treatment with UVC light showed high frequency of mutagenicity for the ORF CV_3722 (Pol III δ subunit). In this way...

Análise da estabilidade genética de células-tronco mesenquimais humanas

Cornélio, Déborah Afonso
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Biotecnologia; Biotecnologia Industrial; Biotecnologia em Agropecuária; Biotecnologia em Recursos Naturais; Biotecn Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Biotecnologia; Biotecnologia Industrial; Biotecnologia em Agropecuária; Biotecnologia em Recursos Naturais; Biotecn
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
Human multipotent mesenchymal stromal cells (MSCs), also known as mesenchymal stem cells, have become an important and attractive therapeutic tool since they are easily isolated and cultured, have in vitro expansion potential, substantial plasticity and secrete bioactive molecules that exert trophic effects. The human umbilical cord as a cell source for cell therapy will help to avoid several ethical, political, religious and technical issues. One of the main issues with SC lines from different sources, mainly those of embryonic origin, is the possibility of chromosomal alterations and genomic instability during in vitro expansion. Cells isolated from one umbilical cord exhibited a rare balanced paracentric inversion, likely a cytogenetic constitutional alteration, karyotype: 46,XY,inv(3)(p13p25~26). Important genes related to cancer predisposition and others involved in DNA repair are located in 3p25~26. Titanium is an excellent biomaterial for bone-implant integration; however, the use can result in the generation of particulate debris that can accumulate in the tissues adjacent to the prosthesis, in the local bone marrow, in the lymph nodes, liver and spleen. Subsequently may elicit important biological responses that aren´t well studied. In this work...

Estudo sobre as potencialidades de compósitos à base de gesso e fibras de coco seco para aplicação na construção civil

Cunha, Paulo Waldemiro Soares
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia de Materiais; Processamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia de Materiais; Processamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The use of gypsum, one of the oldest building materials for the construction industry in the country has been experiencing a significant and steady growth, due to its low cost and some of its properties that confer comparative advantage over other binder materials. Its use comprises various applications including the coating of walls and the production of internal seals and linings. Moreover, the fibers are being increasingly incorporated into arrays fragile in an attempt to improve the properties of the composite by reducing the number of cracks, the opening of the same and its propagation velocity. Other properties, depending on the function of the component material or construction, among these thermal and acoustic performances, are of great importance in the context of buildings and could be improved, that is, having better performance with this embodiment. Conduct a comparative study of physico-mechanical, thermal and acoustic composite gypsum incorporating dry coconut fiber, in the form of blanket, constituted the main objective of this work. Improving the thermal and acoustic performances of precast gypsum, used for lining and internal vertical fences of buildings, was the purpose of development of these composites. To evaluate the effect of fiber content on the properties of the composites were used to manufacture the composite layer with different thicknesses. The composites were fabricated in the form of plates with dimensions of 500x500x24mm. To facilitate the comparative study of the properties were also made with material gypsum boards only. We then determined the physico-mechanical...

Rejeito de xisto como adsorvente para remoção de fenol em águas produzidas na indústria de petróleo

Santiago, Rodrigo César
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
Produced water is the main effluent linked to the activity of extraction of oil and their caring management is necessary due to the large volume involved, to ensure to minimize the negative impacts of discharges of these waters in the environment. This study aimed to analyze the use of retorted shale, which is a reject from the pyrolysis of pirobituminous shale, as adsorbent for the removal of phenols in produced water. The material was characterized by different techniques (grain sized analysis, thermal analysis, BET, FRX, FT-IR, XRD and SEM), showing the heterogeneity in their composition, showing its potential for the removal of varied compounds, as well as the phenols and their derivatives. For the analysis of the efficiency of the oil shale for the adsorption process, assays of adsorption balance were carried through, and also kinetic studies and dynamics adsorption, in the ETE of the UTPF of Petrobras, in Guamaré-RN. The balance assays shown a bigger conformity with the model of Langmuir and the kinetic model more adjusted to describe the adsorption of phenols in retorted shale was of pseudo-second order. The retorted shale presented a low capacity of adsorption of phenols (1,3mg/g), when related to others conventional adsorbents...

Estudo da viabilidade econômica em campos maduros

Senna, Brenny Dantas de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
When it comes to oil and gas in Brazil is almost certain that we are referring to activities in deep waters off the coast of Campos, Rio de Janeiro, the main field of action of PETROBRAS and a small number of multinational oil companies . Since the Law 9.478/97 allows, by means of concessions, that other companies other than Petrobras, to explore and produce oil and gas domestically. Soon it moved, then the private companies that want small and medium-sized businesses to invest in such activities, forming a segment of independent producers, as occurs in other countries. In this context, this work aims at making an economic feasibility study, is currently analyzing how this thread and focus on the factors that contribute to its development as well as those that constitute barriers. To this end, we conducted a survey examining some mature fields that are in production in order to capture cost information in the phases of project, operation and abandonment. The work also presents an analysis of the results obtained in the survey, identifying the costs higher. With the results obtained through the study used economic engineering tools such as NPV and IRR, using a variety of design scenarios, to study the economic viability of these fields. In scenario 4 was set a production of 4.0 m³ / d of oil...

Estudo térmico dos resíduos gerados da destilação atmosférica das misturas diesel/biodiesel de dendê; Thermal study of generated waste from atmospheric distillation of diesel / biodiesel from palm oil mixtures

Aires, Jussyara Dalianne Martins
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The growing world demand for energy supplied by fossil fuels, a major contributor to the emission of pollutants into the atmosphere and causing environmental problems, has been encouraging governments and international organizations to reflect and encourage the use of alternative renewable sources. Among these new possibilities deserves attention biodiesel, fuel cleaner and easy to reproduce. The study of new technologies involving that source is necessary. From this context, the paper aims at analyzing the thermal stability by thermogravimetric analysis, of the waste generated from atmospheric distillation of mixtures with ratios of 5, 10, 15 and 20% palm biodiesel in diesel with and without addition of BHT antioxidant. It was synthesized biodiesel through palm oil, via homogeneous catalysis in the presence of KOH, with and without the use of BHT and subsequently added to the diesel common indoor type (S1800) from a gas station BR. The diesel was already added with 5% biodiesel, and thus the proportions used for these blends were subtracted from the existing ratio in diesel fuel, resulting in the following proportions palm oil biodiesel: 0% (B5), 5% (B10), 10 % (B15) and 15% (B20). From atmospheric distillation analysis...

Simulação de fluxo de fluidos em meios porosos desordenados uma análise de efeito de escala na estimativa da permeabilidade e do coeficiente de arrasto

Barroca Neto, álvaro
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciência e Engenharia do Petróleo; Pesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The present study provides a methodology that gives a predictive character the computer simulations based on detailed models of the geometry of a porous medium. We using the software FLUENT to investigate the flow of a viscous Newtonian fluid through a random fractal medium which simplifies a two-dimensional disordered porous medium representing a petroleum reservoir. This fractal model is formed by obstacles of various sizes, whose size distribution function follows a power law where exponent is defined as the fractal dimension of fractionation Dff of the model characterizing the process of fragmentation these obstacles. They are randomly disposed in a rectangular channel. The modeling process incorporates modern concepts, scaling laws, to analyze the influence of heterogeneity found in the fields of the porosity and of the permeability in such a way as to characterize the medium in terms of their fractal properties. This procedure allows numerically analyze the measurements of permeability k and the drag coefficient Cd proposed relationships, like power law, for these properties on various modeling schemes. The purpose of this research is to study the variability provided by these heterogeneities where the velocity field and other details of viscous fluid dynamics are obtained by solving numerically the continuity and Navier-Stokes equations at pore level and observe how the fractal dimension of fractionation of the model can affect their hydrodynamic properties. This study were considered two classes of models...

Crescimento inicial e morfologia foliar em plantas de Enterolobium contortisiliquum (Vell.) Morong. E Erythrina velutina Mart. ex Benth, sob estresse hídrico

Dantas, Sebastião Gilton
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Florestais; Ciências Florestais; Manejo e Utilização dos Recursos Florestais Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Florestais; Ciências Florestais; Manejo e Utilização dos Recursos Florestais
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The Caatinga is the predominant vegetation type in semi-arid region of Brazil, where many inhabitants depend on hunting and gathering for survival, obtaining resources for: food and feed, folk medicine, timber production, etc. It‟s the dry ecosystem with highest population density in the world. The early stages of development are the most critical during the life cycle of a flowering plant and they‟re primordial to its establishment in environments exposed to water stress. Information about adjustments to the growth of the species, correlated with their studies of distribution in Seridó oriental potiguar, are an important ecological and economic standpoint, because they provide subsidies for the development of cultivation techniques, to programs of sustainable use and recovery of degraded areas. This thesis aimed to study the initial growth and foliar morphology in plants like Enterolobium contortisiliquum (Vell.) Morong. (tamboril) and Erythrina velutina Mart. ex Benth (mulungu), species of occurrence in the Caatinga, under water stress. After sowing and emergency, the seedlings were exposed to three water regimes: 450 (control), 225 (moderate stress) and 112.5 (severe stress) mm of water slide for 40 days. Seeding occurred in bags of 5 kg and after the establishment of seedlings thinning was carried out leaving a plantlet per bag. At the beginning the waterings occurred daily with distilled water...

Da pornografia: os diários de Bruna, Marise e Gabriela: as prostitutas letradas

Bittencourt, Gustavo Henrique Ferreira
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
This dissertation establishes some reading, in the field of social sciences, which has pornography and prostitution as subject - having as main reference the diaries of the prostitutes Bruna Sufistinha, Marise and Gabriela. We have accessed some other literary works through Marquee de Sade, Henry Miller, Georges Bataille and Michel Houellebecq, in order to understand some aspects of the pornographic language. We also analyzed other contemporary discourses on the experience of pornography in cinema and on internet. It is a reflection about sexuality and what is considered obscenity. With observations on the literature of Anaïs Nin, Pauline Réage, and Hilda Hilst we tried to understand the feminine poetic point of view so that we can think about pornography and prostitution; Esta dissertação estabelece uma leitura, no campo das ciências sociais, tomando como assunto a pornografia e a prostituição. Tendo como ponto de referência os diários das prostitutas Bruna Surfistinha, Marise e Gabriela. Recorremos a algumas obras literárias através do Marquês de Sade, Henry Miller, Georges Bataille e Michel Houellebecq, para entendermos alguns aspectos da linguagem pornográfica. Analisamos também outros discursos contemporâneos sobre a experiência da pornografia no cinema e na internet. Trata-se de reflexões em torno da sexualidade e do que se considera obscenidade. Com observações na literatura de Anaïs Nin...

Da crise do estado à democracia como alvo: Observações sobre o neoliberalismo a partir de Friedrich Hayek e Milton Friedman

Ferreira, François de Oliveira
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
The neoliberalism proclaims the crisis of the State in front of globalization , but, approaching two books taken as basic on this theoretical chain - The road to serfdom, of Friedrich Hayek, and Capitalism and Freedom, of Milton Friedman - to analyze this supposed dualism, the conclusion into which we arrive is another one. Remembering liberal tradition and quickly, later, analyzing critically the workmanships, can be perceived that others are the conflicts really gifts in the current capitalist reality - market versus State et capitalism versus democracy - and, from the understanding on the reading made and the theoretical trajectory of its authors, we may see as the neoliberalism locates itself in relation to these conflicts, which polar regions of these antagonisms privileges, what represents the State for itself, and what it intends as much more global philosophy than economic/politics thinking only; O neoliberalismo apregoa a crise do Estado diante da globalização , mas, abordando dois livros tidos como fundamentais dessa corrente teórica O caminho da servidão, de Friedrich Hayek, e Capitalismo e Liberdade, de Milton Friedman para analisar essa suposta dualidade, a conclusão a que chegamos é outra. Recuperada rapidamente a tradição liberal e...

Associativismo nos municípios rurais: uma alternativa de desenvolvimento local em Portalegre/RN

Jales, Edilene Fernandes
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.07%
This work aims to study the associations as mediating the process of social change and its importance for local development. The hypothesis is that associations, but bring dynamism to the smaller cities and improve the living conditions of their members, relegated to the background social sustainability, understood this as a permanent exercise of mobilization and participation in community life. The assumptions of the study are that the practice group has influenced the processes of local development in Brazilian rural municipalities through the mediation of government programs and projects aimed at combating rural poverty require social organization for their achievement. The concept of local development in this work was rescued from studies of political economy and sociology. But the concepts of collective action and partnerships advêem studies of political participation and social development of the theory of alternative or solidarity. The party consisted of an empirical case study conducted with four associations of farmers in the municipality of Portalegre-RN. Why choose qualitative study was used the technique of semi-structured interviews with the chairmen I members of associations and other actors considered essential to understanding the study (religious leaders...

Implementação da política de assistência social em Mossoró/RN : uma avaliação a partir dos centros de referência da assistência social

Castro, Márcia da Silva Pereira
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
The current National Policy for Social Assistance (PNAS) is the instrument that regulates the organization and procedures of social-welfare actions. Developed and approved in 2004 since the Unified Social Assistance System (ITS) was crated in 2003, it reaffirms the democratic principles of the Social Assistance Organic Law (LOAS) focusing on the universalization of social rights and equality of rights when accessing the social-welfare system. In the SUAS point of view, the PNAS highlights the information, monitoring and evaluation fields for being the best way to assure the regulation, organization and control by the Federal Government paying attention to the principles of decentralization and participation. This political-institutional rearrangement occurs through the pact among all the three federal entities. The pact deals with the implementation of the task. It says that it has to be shared between the federal autonomous entities, established by dividing responsibilities. To the cities, considered as the smallest territorial unit of the federation and closer to the population, was given the primary responsibility, which is to feed and maintain the database of SUAS NETWORK and identify families living in situations of social vulnerability. In addition to these responsibilities...

Brincar, atividade humana e ferramenta pedagógica no contexto escolar da região metropolitana de natal

Estácio, Mércia Maria de Santi
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.09%
This thesis talks about the use of guided educational tools in play and playful in public schools in the Metropolitan Region of Natal (MRN), contributing to the teaching and students learning of basic education in the contents of portuguese and mathematics. We assume that the play is an activity / human need and therefore implies the proper development of children in physical, psychological, biological, cultural, social and historical aspects. We consider the mediation exercised by the teacher in the classroom, and the affection existing between teacher and student, sine qua non terms, so that the truth and fact of the process of teaching and learning occur. Thus, theoretically collaborated Paulo Freire, with his dialogical vision; Lev S. Vygotsky says that we learn and why we develop; Lev S. Vygotsky that states that we learn and for that we develop ourselves; Pierre Bourdieu and the concept of habitus, as something embedded and therefore procedural, and the cultural capital that needs to be fed and (re)meaning at school; Luiz Pereira, Bernard Lahire, Gilles Brougère and others brought their theoretical contributions. The empirical field of research was composed by the Municipal School Professor Ulysses de Góis, located in the neighborhood of Nova Descoberta in Natal...

Histórias de idosos: sementes para cultivarmos uam educação para uma velhice bem-sucedida

Andrade, Everaldo Robson de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Educação; Educação Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Educação; Educação
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.18%
We understand that the successful old age is not confined only in the analysis of quantitative aspects concerning the economic situation of the subject that gets old, but this special way of aging is related to other values, such as dignity, happiness, self-esteem, willingness, autonomy, independence, social involvement with family and friends, among others. Thus, this study aimed to investigate the human aging process, considering the history of life of ten seniors who fit the profile of successful old age, seeking to identify elements that contribute to educational thinking in order to get a successful aging. In this perspective, we argue in this study, the idea that we need to learn to engage in experiences that more than providing satisfaction and well-being in the moment in which we conducted, serve as a potentiating to a successful old age. Thus, throughout this thesis we question: what are the present indicative in the histories of life of elderly people, considered successful, which may contribute to an education that people experiencing their age more satisfactorily. This is a qualitative study, that took as universe a methodological oral history, in which we used as a technique of research a semistructured interview as a part of their life history...

Indicadores de cálcio e de voltagem codificados geneticamente na detecção de potenciais de ação e inputs sinápticos em cultura de neurônios hipocampais

Vieira, Hermany Munguba
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Neurociencias; Neurobiologia Celular e Molecular; Neurobiologia de Sistemas e Cognição; Neurocomputação Neuroengen Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Neurociencias; Neurobiologia Celular e Molecular; Neurobiologia de Sistemas e Cognição; Neurocomputação Neuroengen
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
Recently, genetically encoded optical indicators have emerged as noninvasive tools of high spatial and temporal resolution utilized to monitor the activity of individual neurons and specific neuronal populations. The increasing number of new optogenetic indicators, together with the absence of comparisons under identical conditions, has generated difficulty in choosing the most appropriate protein, depending on the experimental design. Therefore, the purpose of our study was to compare three recently developed reporter proteins: the calcium indicators GCaMP3 and R-GECO1, and the voltage indicator VSFP butterfly1.2. These probes were expressed in hippocampal neurons in culture, which were subjected to patchclamp recordings and optical imaging. The three groups (each one expressing a protein) exhibited similar values of membrane potential (in mV, GCaMP3: -56 ±8.0, R-GECO1: -57 ±2.5; VSFP: -60 ±3.9, p = 0.86); however, the group of neurons expressing VSFP showed a lower average of input resistance than the other groups (in Mohms, GCaMP3: 161 ±18.3; GECO1-R: 128 ±15.3; VSFP: 94 ±14.0, p = 0.02). Each neuron was submitted to current injections at different frequencies (10 Hz, 5 Hz, 3 Hz, 1.5 Hz, and 0.7 Hz) and their fluorescence responses were recorded in time. In our study...

A agricultura familiar do Seridó potiguar: vulnerabilidade, percepção e adaptação às mudanças climáticas; Family farming at the Serido s region of Rio Grande do Norte: vulnerability, perception and adaptation to climate change

Andrade, Anna Jéssica Pinto de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa Regional de Pós-Graduação em Desenvolvimento e Meio Ambiente PRODEMA; Meio Ambiente, Cultura e Desenvolvimento Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa Regional de Pós-Graduação em Desenvolvimento e Meio Ambiente PRODEMA; Meio Ambiente, Cultura e Desenvolvimento
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
At the semiarid regions of developing countries the rural population has always been vulnerable to the climatic variations e its consequences. The effects of the semiarid climate, together with other biophysics, social and political-economic factors, impair the agricultural production, generating a situation of food insecurity and poverty in the rural areas. With the occurrence of climate change, natural resources of the semiarid regions can became scarcer, what would directly affect the agricultural production and those who depend on it. Therefore, the present study sought to study one of the most susceptible areas to the effects of the semiarid climate and desertification of Rio Grande do Norte, the potiguar s Serido. The study aimed to analyze the socioeconomic and environmental factors that put farmers in a position of vulnerability to the effects of climate; assess their perceptions about climate variations that have already occurred and their knowledge about climate change and global warming, also to identify which adaptation strategies to climate they have adopted at the rural establishment. The survey was conducted in 29 communities of four counties of the potiguar s Serido Caico, Parelhas, Lagoa Nova and Acari. Semi-structured interviews were conducted with local leaders and 241 questionnaires were applied with the family farmers. It was found that in addition to environmental factors such as the scarcity of water resources and climatic conditions...

Códigos de sustentação da linguagem no cotidiano prisional do Rio Grande do Norte: penitenciária estadual de Parnamirim

Oliveira, Hilderline Camara de
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Ciências Sociais; Desenvolvimento Regional; Cultura e Representações
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
The quarrel, in this study, tells about the language as social practical in the daily of Parnamirim State Prison that is integrated to the Rio Grande do Norte Penitentiary System - SISPERN, destined for men in fulfilment of penalty privative of freedom, in closed regimen. For the accomplishment of the research, the delimited objectives had been to analyze the language repertoires created in the prisional daily, trying to identify how it´s turned into distinct forms of resistance to the mechanisms of control in penitentiary system; to investigate which are the language repertoires created from the new sociability forms developed among prisoners and identify how the language repertoires are expressed in the daily prisional on relations/exercises of power not-institutionalized. In the methodological aspect, the study is in a qualitative boarding, that has as main instrument the interview. The inquiry was possible by means of using instruments for data collection, like as: the direct comment in the prisional daily duly registered as researcher´s ethnographical procedure, the analysis of interns´ cadastre handbooks and the application of half-structuralized interview, to the subjects of the research. The construction and understanding of the study object had been based on authors who argue on the arrest...

Análise da competitividade potencial da cadeia exportadora de feijões brasileira; Analysis of the potential competitiveness of the export chain system dynamics

ALMEIDA, Paulo Roberto Vieira de
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronegócio; Ciências Agrárias Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronegócio; Ciências Agrárias
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
Beans are an important component in the Brazilian diet and various countries across the globe. In Brazil is grown by farmers in various profiles at different scales, regions and farming systems. Brazil has a problem with self-sufficient in beans, historically presented as a major importer of grain, has a low market share in world exports that occurs far from the fact that these markets consume certain types of beans that Brazil has no tradition of produce, the type that is predominantly produced and consumed in Brazil is common bean. The international market beans can be better explored, but is necessary to organize the national production chain. Because of the importance of beans in the Brazilian domestic market, and low expression in exports, we chose to analyze the potential competitiveness of the export chain of brazilian beans. The competitive analysis contemplated the production sector and the export sector, it was developed through 9 drivers and 48 sub-factors that together indicate how is the condition of potential competitiveness of the chain. The evaluation was conducted from the perspective of key players and use of secondary data. Through the data collected it was found that the bean export chain is not currently so structured as other commodities...

Estudo da Potencialidade da produção de tijolos de adobe misturado com outros materiais: uma alternativa de baixo custo para a construção civil

Bouth, Jorge Alberto Cardoso
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Mecânica; Tecnologia de Materiais; Projetos Mecânicos; Termociências Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Mecânica; Tecnologia de Materiais; Projetos Mecânicos; Termociências
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.14%
The production of the red pottery brick, made traditionally with clay, is a technique that is already stabled. However, in spite of the little complexity that involves the conventional process of these bricks production, it are exposed to many problems that begin in the fase of exploration of the mines, the problems get worse because of the lack of the clay's characterization, and they continue through the steps of the dough preparation, conformation of the products, the drying and the burning process. The wastefulness is shown and so is the low quality of the material produced. Among other factors, the high use of energy in the burning makes the cost of this material inaccessible to the low income consumer. Besides this, the destruction of the environment around the mines and the use of native vegetation to produce wood - the most used fuel in the pottery industry - make serious environmental damage. The production technique of a new type of simple brick (adobe), that has low cost and no environmental damage, can be the viable altemative to lower the cost of this part of the civil construction, and, consequently, in the building of cheaper houses. In this paper, the results of the mechanical resistance of the adobe brick are shown...

Proposição de indicadores de desenvolvimento sustentável para assentamentos rurais.; Proposition of indicators of sustainable development of agricultural nestings

Neiva, José da Luz
Fonte: Universidade Federal de Alagoas; BR; Desenvolvimento sustentável Regional; Programa de Pós-Graduação em Desenvolvimento e Meio Ambiente; UFAL Publicador: Universidade Federal de Alagoas; BR; Desenvolvimento sustentável Regional; Programa de Pós-Graduação em Desenvolvimento e Meio Ambiente; UFAL
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
46.1%
The Subject evidences the importance of the proposition of indicators of sustainable development for Agricultural Nestings, with the objective to support of the decisions of the governmental bodies and managers of a general form, in the implantation, accompaniment, support and evaluation to the implanted projects and to be implanted. Through the historical analysis of the brazilian agrarian question and the chosen theorical landmarks: the indicators of sustainable development; and family agriculture, was possible to know the theoretical structure witch involves the subject. Regarding the indicators of sustainable development it was proceeded a research concerning it s evolution, identifying the main studies about: the work of construction indicators of sustainable development led by the Commission for Sustainable Development CDS, of the United Nations; indicators of sustainable development Brazil 2004, of the IBGE; of the Balaton Group (Donella Meadows and others), in the Triângulo de Daly ; of the Bossel project; of the Monet model of Switzerland; and, the total socio-ecologial system, of the CEPAL. The boarding of the theorical landmark Familiar Agriculture included the analysis of some definitions and it s categories and identified the types...