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Federal University of Roraima

Education
About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.


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Journal ArticleDOI
TL;DR: The comparative transcriptome and preliminary proteome data from symptomatic and asymptomatic tissues, support the occurrence of hormonal imbalance identified through several plant hormone-related genes and proteins differentially expressed only in symptomatic tissues.
Abstract: Oversprouting is a poorly studied disease of guarana plant (Paullinia cupana var. sorbilis), a native species from Amazon Rainforest caused by Fusarium decemcellulare (FDC) that affects the plant growth and reproduction, severely compromising productivity. The sorbilis variety of guarana is anciently cultivated and is used today for the industry of soft drinks, cosmetic and pharmaceutical. Transcriptome, proteome, light and electron microscopy were used to compare symptomatic and asymptomatic tissues and reveal anatomical, histological and cytological alterations resultant from the disease. Disease symptoms described here include a marked reduction in the longitudinal axis and the formation of “capsules”, named as this for the first time here, which display hard thickened external walls and contain extremely malformed floral organs and/or poorly differentiated vegetative primordia when occurring isolate in individual branching points. The aggregate of multiple “capsules” in a same branch point produces galls. The production of indol-acetic acid (IAA) in vitro by F. decemcellulare was for the first time reported and the comparative transcriptome and preliminary proteome data from symptomatic and asymptomatic tissues, support the occurrence of hormonal imbalance identified through several plant hormone-related genes and proteins differentially expressed only in symptomatic tissues. Auxin signaling mechanism, as well as auxin-responsive genes associated to cell cycling, division and proliferation also occurred differentially in infected tissues. Oversprouting and the reduction of the longitudinal axis in malformed cells and organs are related to hormonal unbalance are discussed in this paper.

1 citations

Journal ArticleDOI
02 Aug 2021
TL;DR: In this article, the authors describe the trajectory of a northeastern migrant who arrived in Roraima in the 1980s, and reveal the memories and stories of a 51-year-old man from the state of Goias.
Abstract: This paper describes the trajectory of a northeastern migrant who arrived in Roraima in the 1980s.The choice for the theme is based on two important moments: the first was the memories of childhood, of culture, something very strong in my life; the second occurred when, during the master's course classes, I became aware of the historicity and identity that I built throughout this period mediated by the social relations of living environments, feeling the need to register these re-significations of territorial identities. At each instance lived there was a growth, with the aggregation of new cultural values, where it was influenced and also influenced. The narrative research proposes to reveal the memories and stories of a 51-year-old man, who arrived in the state of Roraima at the age of 18, from the state of Goias. We conclude that school is important for. The development of the systematic knowledge process that guides the subjects' lives during their existence, providing opportunities for a better quality of life and more conscious actions about the problems they experience.

1 citations

DOI
30 Sep 2020
TL;DR: In this paper, a relevância do agronegocio for o cenario economico do pais (2011 a 2016) was investigated. But, o result of this analysis was not a good fit for a setor, e o problema que norteia este trabalho e o de saber se o agrone gocio brasileiro contribui de maneira significativa.
Abstract: Este artigo intitulado “O Agronegocio no Brasil: Uma analise sobre a relevância do agronegocio para o cenario economico do pais (2011 a 2016)” procurou tratar da tematica em torno do agronegocio. Foram escolhidos os anos de 2011 a 2016 por estes apresentarem um crescimento positivo e tambem uma desaceleracao em relacao ao setor. E sabido que no Brasil o agronegocio tem sido muito importante principalmente no que se refere ao sustento alimentar das pessoas e sua manutencao, alem de contribuir para o crescimento da exportacao e do pais que o executa. O objeto de estudo deste artigo e o Brasil, e o problema que norteia este trabalho e o de saber se o agronegocio brasileiro contribui de maneira significativa para o crescimento economico do pais. Para a construcao pratica desta pesquisa, consultou-se os indicadores de grande relevância para este setor. Ao final deste trabalho, chegou-se ao resultado de que o agronegocio contribui de maneira significativa para o crescimento economico do Brasil.

1 citations

Journal ArticleDOI
TL;DR: Palavras-chave et al. as mentioned in this paper identified the interorganizational cooperative relations between the Cooperativa Agropecuaria de Esteios Ltda (COOESTEIOS) and its main partners, verifying the influence of the trust in the process of development of these relationships.
Abstract: O estudo sobre as redes de cooperacao vem crescendo e deve ao surgimento da nova competicao, a emergencia das tecnologias da informacao e comunicacao, e a insercao da analise de redes como disciplina academica. Dessa forma, as redes interorganizacionais representam uma forma particular de organizacao e sao caracterizadas por relacoes de troca entre os parceiros, onde a cooperacao e um processo fundamental e a confianca e essencial. Assim, este artigo teve como principal objetivo identificar as relacoes interorganizacionais cooperativas entre a Cooperativa Agropecuaria de Esteios Ltda (COOESTEIOS) e seus principais parceiros, verificando a influencia da confianca no processo de desenvolvimento desses relacionamentos. Atraves de entrevistas semiestruturadas, analise de documentos referentes ao processo de concepcao e sustentacao desses relacionamentos e observacao espontânea, pode-se concluir que, nesta relacao, a confianca entre os atores e forte e suas relacoes sao puramente sociais, baseadas na caracteristica e etnia dos parceiros, nas quais o capital social e a relacao de coexistencia e cooperacao fortalecem a parceria, sem a necessidade de haver qualquer tipo de acordo formal. Palavras-chave: Relacoes interorganizacionais. Confianca interorganizacional. Cooperativa de pequenos produtores. Abstract Interorganizational cooperative relations: a trust analysis The study on cooperation networks has been growing and it is due to the emergence of new competition, the emergence of information and communication technologies, and the insertion of network analysis as an academic discipline. In this way, interorganizational networks represent a particular form of organization and are characterized by relations of exchange between partners, where cooperation is a fundamental process and trust is essential. Thus, this article had as main objective to identify the interorganizational cooperative relations between the Cooperativa Agropecuaria de Esteios Ltda (COOESTEIOS) and its main partners, verifying the influence of the trust in the process of development of these relationships. Through semi-structured interviews, documentation analysis regarding the process of conception and support of these relationships and spontaneous observation, it was possible to point out that, in this relationship, trust between the actors is strong and their relationships are purely social, based on the characteristics and ethnicity of the partners, where social capital and coexistence and cooperation relationships strengthen the partnership, without the need for any kind of formal agreement. Keywords: Interorganizational relations. Inteorganizational trust. Small producers cooperative.

1 citations

Journal ArticleDOI
TL;DR: In this article, a study on the effect of carbonato de calcio on the comportamento mecânico dos corpos queimados, observando-se reducao no modulo de ruptura a flexao a medida that a EPU aumenta.
Abstract: O fenomeno da expansao por umidade (EPU) resulta da acao da agua e seus vapores causando a expansao dos materiais cerâmicos, podendo provocar danos no material e prejudicar sua vida util. Na literatura existe muita enfase nos problemas gerados pela EPU e nas tensoes resultantes dessa expansao, porem ate o presente nao ha dados relativos ao comportamento mecânico dos materiais cerâmicos apos acao da EPU. Trabalhos recentemente desenvolvidos na UFCG tratam especificamente desse problema em blocos cerâmicos de vedacao. Inicialmente verificou-se que, no caso de massas cerâmicas para uso em cerâmica vermelha queimadas em diversas temperaturas na faixa de 700 a 1100 oC, e com a EPU induzida por imersao, fervura e autoclavagem, a EPU tem correlacao com o comportamento mecânico dos corpos queimados, observando-se reducao no modulo de ruptura a flexao a medida que a EPU aumenta. Trabalhos desenvolvidos com massas para uso em cerâmica vermelha aditivadas com carbonato de calcio e carbonato de magnesio e queimadas entre 850 e 1000 oC, evidenciaram o efeito benefico do carbonato de calcio na reducao da EPU e aumento da resistencia a flexao, sendo observada correlacao entre EPU e modulo de ruptura a flexao, mas, no entanto, nao foi observada correlacao entre a EPU e o modulo quando da utilizacao do carbonato de magnesio. Pesquisas efetuadas com massas para cerâmica vermelha aditivadas com quartzo fino, visando o desenvolvimento de fases vitreas, nao mostraram correlacoes bem definidas entre EPU e modulo de ruptura, sendo observado que adicoes de 10 e 20% de quartzo melhoram a resistencia mecânica dos corpos cerâmicos apos autoclavagem e que a adicao de 30% de quartzo reduz seu modulo de ruptura.

1 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20222
2021125
2020183
201992
201899