Institution
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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TL;DR: The recognition of animal diversity, especially vertebrates, beyond just mammals and birds, as well as conceptual clarity about the conservation of nature, are fundamental factors for the development of critical awareness of fauna and its conservation, and where the processes of schooling have a preponderant role.
Abstract: In addition to playing a key role in the dynamics of ecosystems, animal diversity, especially that of wild vertebrates, is intimately linked with human evolutionary history, which has resulted in diverse interactions that must be emphasized in formal education processes. We analyzed several methods of approaches used for biological education in order to teach about wild vertebrates and their conservation in urban and rural schools in the semi-arid region of Brazil. Data were obtained via questionnaires applied to 990 students, of which 528 were urban and 462 rural, distributed among the seven grades/years that comprise the last two cycles of basic education in Brazil. The richness and diversity of the animals cited by the students were calculated, being the diversity using an adaptation of the equation for the Shannon-Weaver Index (H′). Data were analyzed using non-parametric descriptive statistics. Mammals and birds had the greatest richness and diversity of animals cited as most-studied in science/biology classes, and also the most indicated as occurring in the studied region. Among mammals, large carnivores with a showy appearance and utilitarian value had the highest citation frequencies, while there was a tendency for limited recognition of faunistic diversity in the other groups mentioned. Almost 70% of the students stated that their schooling processes dealt with the conservation of wild animals; however, about 50% of the students in both urban and rural contexts did not express conceptual understanding about the conservation of nature. The recognition of animal diversity, especially vertebrates, beyond just mammals and birds, as well as conceptual clarity about the conservation of nature, are fundamental factors for the development of critical awareness of fauna and its conservation, and where the processes of schooling have a preponderant role. Finally, the study contributes to the legitimization of Ethnobiology as an interdisciplinary field of knowledge, especially in its interface with education, in addition to pointing out the importance of optimizing efforts in approaches to biodiversity conservation in formal educational processes.
5 citations
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31 Dec 2013TL;DR: A densidade de plantas pode maximizar o potencial produtivo de variedades de milho melhoradas, uma vez that, em geral, estas apresentam porte mais baixo e arquitetura foliar mais ereta.
Abstract: A densidade de plantas pode maximizar o potencial produtivo de variedades de milho melhoradas, uma vez que, em geral, estas apresentam porte mais baixo e arquitetura foliar mais ereta. Objetivou-se com esse trabalho avaliar o efeito de tres densidades de plantios nos componentes de producao do milho transgenico hibrido Pioneer 30F35HR cultivado na savana de Roraima. O experimento foi conduzido na area experimental do Centro de Ciencias Agrarias da Universidade Federal de Roraima, no Campus do Cauame, no municipio de Boa Vista, Roraima, Brasil. O milho foi plantado em sistema de plantio direto. O delineamento experimental utilizado foi de blocos ao acaso com tres tratamentos e oito repeticoes. Os tratamentos consistiram de tres espacamentos entre plantas: 0,33; 0,25; e 0,20 m. As linhas de plantio foram espacadas de 0,80 m, resultando em uma populacao de 37.500, 50.000 e 62.500 plantas ha-1, respectivamente. As avaliacoes das caracteristicas morfologicas e agronomicas das plantas de milho foram feitas aos 70 e 100 dias apos o plantio. Os valores medios do numero da folha da insercao da primeira espiga, altura da insercao da primeira espiga, altura da folha bandeira, altura total da planta, numero de folhas totais, numero de folhas verdes e numero de folhas depois da primeira espiga do milho hibrido transgenico Pioneer 30F35HR nao sao influenciados pelo aumento da densidade de plantio entre 37.500 e 62.500 plantas ha-1. O aumento da densidade de plantio de 37.500 para 62.500 plantas ha-1 reduz a qualidade da espiga do milho, mas eleva a biomassa total e a produtividade de graos.
5 citations
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TL;DR: In this paper, the difficulties encountered by the Executive Secretary of professionals concerning their integration in the labor market in the city of Boa Vista, Roraima, in the northern Amazon was determined.
Abstract: This article aims to determine the difficulties encountered by the Executive Secretary of professionals concerning their integration in the labor market in the city of Boa Vista, Roraima, in the northern Amazon. Therefore, it was a qualitative study, with in-depth interviews with professionals from the Executive Secretary and Human Resources managers. After data analysis, it was found that the insertion difficulties in the labor market for these professionals are: shortage of jobs in the private sector in Roraima; low pay to the profession; lack of recognition and lack the powers of managers, which indicate the versatility and employability security for Executive Secretariat professionals. Seeing a gap is seen in two views as to the professionals of the Executive Secretariat, only the versatility is not employment guarantee.
5 citations
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TL;DR: In this article, regnelli et al. investigate a componente arboreo regenerante in a floresta no Planalto Sul de Santa Catarina, Brazil, and compare it with o componente adulto.
Abstract: RESUMO O estudo objetivou inventariar o componente arboreo regenerante em uma floresta no Planalto Sul de Santa Catarina e compara-lo ao componente adulto da mesma area. Foram alocadas 25 parcelas, onde os regenerantes e adultos foram identificados e quantificados. Foi calculado o Indice de Regeneracao Natural Total (RNT) de cada especie. Para verificar a similaridade entre os componentes, foi utilizada a Analise de Similaridade e o indice de Jaccard. Foram amostrados 503 regenerantes, pertencentes a 58 especies e 29 familias. Myrtaceae foi a familia de maior riqueza (13). Leandra regnelli (Triana) Cogn., Myrcia splendens (Sw.) DC. e Miconia cinerascens Miq. apresentaram os maiores valores de RNT. Houve elevada dissimilaridade entre regenerantes e adultos, sendo que 37,5% das especies do componente adulto nao tiveram representantes na regeneracao natural. Conclui-se que existe uma baixa capacidade regenerativa da maior parte das especies, o que pode estar associado a presenca de gado na area.
5 citations
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TL;DR: In this paper, Bacillus sp. sed 1.4 was selected for production of antimicrobial activity, and was characterized by MALDI-TOF and 16S rDNA sequencing.
Abstract: Bacteria of the genus Bacillus sp. present the potential for inhibiting various pathogens, making them a promising starting point in the search for new antimicrobial substances. In this study, bacteria were isolated from sediment samples from humid areas of a Natural Conservation Unit in the state of Rio Grande do Sul, Brazil. The isolate Bacillus sp. sed 1.4 was selected for production of antimicrobial activity, and was characterized by MALDI-TOF and 16S rDNA sequencing. Phylogenetic analysis showed that Bacillus sed 1.4 was closely related to Bacillus altitudinis and Bacillus pumilus. The cell-free supernatant was partially purified using ammonium sulfate precipitation, gel filtration chromatography (Sephadex G-200) and an ultrafiltration membrane. Partial purification resulted in specific activity of 769.23 AU/mg, with a molecular mass of approximately 148 kDa. This antimicrobial substance showed stability at 100°C for 5 min, and was inactivated by proteolytic enzymes. An antimicrobial effect against Listeria species was observed. Considering the importance of the Listeria genus in the area of food safety, this antimicrobial activity should be further explored, specifically in the field of dairy products and with a focus on food biopreservation studies.
5 citations
Authors
Showing all 984 results
Name | H-index | Papers | Citations |
---|---|---|---|
A. Townsend Peterson | 91 | 521 | 51524 |
Felipe Gomes Naveca | 25 | 97 | 2612 |
Pablo Acosta | 23 | 91 | 3629 |
Adrian Martin Pohlit | 21 | 69 | 1491 |
Regina V. Oliveira | 20 | 48 | 1146 |
Maria Goreti Rosa-Freitas | 20 | 34 | 990 |
S. B. Legoas | 18 | 45 | 2150 |
Luciano Nicolás Naka | 18 | 44 | 1415 |
Rodrigo Rodrigues | 17 | 152 | 1128 |
Robson F. de Farias | 16 | 86 | 925 |
Adriana Flach | 15 | 34 | 642 |
Regynaldo Arruda Sampaio | 15 | 128 | 1001 |
Elizanilda Ramalho do Rêgo | 14 | 90 | 793 |
Raynner Rilke Duarte Barboza | 14 | 41 | 977 |
Fabiana Granja | 14 | 41 | 915 |