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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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13 Aug 2016
TL;DR: In this article, a study of the transtorno do espectro autista (TEA) no âmbito das relações familiares têm enfatizado, em sua maioria, a figura materna.
Abstract: RESUMO – Os estudos acerca do Transtorno do Espectro Autista (TEA) no âmbito das relações familiares têm enfatizado, em sua maioria, a figura materna. Nesse contexto, investigações sobre as relações fraternas são escassas. Nessa direção, o presente estudo de cunho qualitativo e descritivo teve por objetivo caracterizar as interações sociais entre sujeitos com desenvolvimento típico (DT) e seus irmãos com TEA. Participaram do estudo duas díades de irmãos. Os instrumentos utilizados foram: Formulário de Informações sobre a Família, Formulário de Informações sobre o irmão com TEA e entrevista semiestruturada. Os resultados indicaram que as interações se constituem por sentimentos ambíguos, altruísmo, maturidade, conflitos devido às características da síndrome, companheirismo, poucas responsabilidades frente ao irmão com TEA e apoio familiar. Em suma, a relação entre os irmãos foi facilitada por amizades em comum, orientações das mães junto aos filhos com DT, relativa autonomia do irmão com TEA e redes de apoio familiar e especializado. Os fatores que dificultam tais interações relacionam-se às características clássicas do autismo e falta de tempo por parte dos pais. Conclui-se que as particularidades de cada família determinam as interações sociais entre sujeitos com DT e irmãos com TEA.

9 citations

Journal ArticleDOI
TL;DR: One family, seven genera and eleven species are new records for the State; one of them, Ceratiomyxa sphaerosperma Boedj.
Abstract: This survey raises the number of registers referred to the State of Roraima to 28 species of Myxomycetes. Of these, 24 were collected in the Maraca Ecological Reserve (Lat.3°l 5' - 3°35'N, Long. 61°22' - 61°58'WG). The following families and genera are registered: Ceratiomyxaceae (Ceratiomyxa, 4 sp); Cribrariaceae (Cribraria, lsp, Dictydium, lsp); Didymiaceae (Didymium, 2 sp); Enteridiaceae (Lycogala, 1 sp, Tubifera, 2 sp); Physaraceae (Craterium, 2 sp, Fuligo, 1 sp, Physarum, 2 sp); Stemonitaceae (Comatricha, 1 sp, Stemonitis, 4 sp); Trichiaceae (Arcyria, 3 sp, Hemitrichia, 2 sp, Perichaena, 1 sp, Trichia, Isp). One family, seven genera and eleven species are new records for the State; one of them, Ceratiomyxa sphaerosperma Boedj., is new for Roraima State and Northern Brazil. Comments and geographical distribution of these species are presented.

9 citations

Journal ArticleDOI
07 Oct 2015
TL;DR: Os resultados sugerem that as armadilhas sejam colocadas nas bordas do plantio, para coleta e controle destes insetos-pragas, no estado de Roraima.
Abstract: Objetivou-se com o presente trabalho avaliar o padrao de distribuicao espacial, bem como o raio de agregacao de Metamasius hemipterus em plantio de dende (Elaeis guineensis), no estado de Roraima. A area experimental esta localizada no municipio de Sao Joao da Baliza, RR, onde foram realizadas 24 amostragens no periodo de setembro de 2013 a agosto de 2014. O perimetro da area foi demarcado com receptor de sistema de posicionamento global, e os grides de amostragem tiveram dimensao de 45 x 45 m. A distribuicao espacial foi determinada colocando-se uma armadilha do tipo balde com atrativo alimentar (cana-de-acucar), em cada ponto amostral, no qual obteve-se o valor da variavel (numero de insetos/armadilha) e as coordenadas (latitude e longitude). As analises da variabilidade e da dependencia espacial foram feitas atraves de incorporacao de procedimentos geoestatisticos baseados em tecnicas de modelagem espacial por semivariogramas. Ja os mapas de krigagem foram gerados a partir dos dados de contagem de adultos de M. hemipterus em campo. Os grides de amostragem foram apropriados para caracterizar a distribuicao espacial do M. hemipterus em campo. Observou-se que a distribuicao espacial de M. hemipterus e agregada com dependencia espacial descrita pelo modelo esferico, formando “reboleiras” de 78 a 199 m (alcance do modelo). Por meio dos mapas de krigagem, foi observado que a infestacao se da inicialmente nas bordas do plantio, com posterior disseminacao para toda a area. Os resultados sugerem que as armadilhas sejam colocadas nas bordas do plantio, para coleta e controle destes insetos-pragas.

9 citations

Journal ArticleDOI
TL;DR: In this article, the authors evaluated sulfentrazone leaching in five soils of the sugarcane region in the Northeast Region of Brazil, with different physical and chemical properties, by means of bioassay and high-performance liquid chromatography (HPLC) resolution.
Abstract: Sulfentrazone leaching potential is dependent on soil properties such as strength and type of clay, organic matter content and pH, and may result in ineffectiveness of the product and contamination of groundwater. The objective of this study was to evaluate sulfentrazone leaching in five soils of the sugarcane region in the Northeast Region of Brazil, with different physical and chemical properties, by means of bioassay and high-performance liquid chromatography (HPLC) resolution. The experiment was conducted in a split plot in a completely randomized design. The plots had PVC columns with a 10 cm diameter and being 50 cm deep, filled with five different soil classes (quartzarenic neosol, haplic cambisol, yellowish-red latosol, yellowish-red acrisol, and haplic gleysol), and subplots for 10 depths in columns, 5 cm intervals. On top of the columns, sulfentrazone application was conducted and 12 hours later there was a simulated rainfall of 60 mm. After 72 hours, the columns were horizontally placed and longitudinally open, divided into sections of 5.0 cm. In the center of each section of the columns, soil samples were collected for chromatographic analyses and sorghum sowing was carried out as an indicator plant. The bioassay method was more sensitive to detect the presence of sulfentrazone in an assessment for chromatography soil, having provided greater herbicide mobility in quartzarenic neosol and yellowish-red latosol, whose presence was detected by the indicator plant to a depth of 45 and 35 cm, respectively. In the other soils, sulfentrazone was detected up to 20 cm deep. The intense mobility of sulfentrazone in quartzarenic neosol may result in herbicide efficiency loss in the soil because the symptoms of intoxication and the amount of herbicide detected via silica were highest between 15 cm and 35 cm depth regarding the soil surface layer (0-10 cm), indicating that sulfentrazone should be avoided in soils with such characteristics.

9 citations

Journal ArticleDOI
TL;DR: In this paper, the authors compared Brody, Von Bertalanffy, Gompertz, France, Logistic, Modified logistic and Dual-pool logistic models for cumulative gas production curve in sunflower and corn silages.
Abstract: The aim of this work was to identify among the Brody, Von Bertalanffy, Gompertz, France, Logistic, Modified logistic and Dual-pool logistic models, the one that presents the highest quality of fit for cumulative gas production curve in sunflower and corn silages. The quality of fit was evaluated by coefficient of determination, residual mean square, graphic analysis of the observed and estimated curves, graphic analysis of dispersion of the studentized residual, average percentage error, relative efficiency and number of iteractions to converge. Brody, France and Dual-pool logistic models showed the largest values of coefficient of determination in both substrates, and the difference among them was considered worthless. They also showed the smallest values of residual mean square in sunflower silages, being the difference among them considered worthless. Brody and France models presented smaller residual mean square in corn silages. All the models showed positive dispersion of the residual in both substrates after 144 hours of incubation. The Brody model showed smaller average percentage error and number of iterations in both substrates. The Dual-pool logistic and France models showed higher relative efficiency, respectively, in sunflower and corn silages. Thus, the Dual-pool logistic model showed higher quality of fit to the gas production curve in sunflower and corn silages.

9 citations


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