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: It is suggested that poor and seasonally flooded soils tend to reduce the chances of occurrence of herbaceous legumes in savanna areas of Roraima, adversely affecting its richness/diversity.
Abstract: Edaphic factors have been indicated as a determinant of the distribution of plant communities in Amazonia. The aim of this study was to detect which edaphic factors determine the occurrence of herbaceous legumes in Amazonian savannas. Therefore, an inventory of herbaceous flora of the family Leguminosae was conducted in 34 permanent plots established in two savanna areas of Roraima, northern Brazilian Amazon. The importance value index was higher for Chamaecrista desvauxii (24.9%), Aeschynomene hystrix (15.7%) and Galactia jussiaeana (10.8%), all having high abundance and wide distribution. The results indicated low density or absence of individuals and species in plots established on poorly drained soils (hydromorphic). Diversity and species richness tended to be higher in habitats formed on well drained soils, greater fertility and lower concentrations of exchangeable aluminum. It is suggested that poor and seasonally flooded soils tend to reduce the chances of occurrence of herbaceous legumes in savanna areas of Roraima, adversely affecting its richness/diversity.
6 citations
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TL;DR: In this article, the capacidade maxima de adsorcao de fosforo (CMAP) in solos de Roraima and atributos that interferem na magnitude dessa caracteristica sao relevantes e motivaram esse trabalho.
Abstract: Estudos sobre capacidade maxima de adsorcao de fosforo (CMAP) em solos de Roraima e atributos que interferem na magnitude dessa caracteristica sao relevantes e motivaram esse trabalho. Nesse contexto, amostras da camada superficial (0-0,20 m) de quatro classes de solos: Latossolo Amarelo - LA e Latossolo Vermelho - LV (ITA, Caracarai); Latossolo Amarelo - LA (Serra da Prata, Mucajai); Latossolo Amarelo - LA e Argissolo Amarelo - PA (CCA, Boa Vista-RR); Plintossolo Argiluvico – FT (Bonfim) e Planossolo Natrico - SN (Surumu, Pacaraima) representativos do estado de Roraima, foram utilizadas no presente trabalho, com a finalidade de determinar a influencia de atributos fisicos, quimicos e da mineralogia dos solos sobre a CMAP. Amostras de 2,5 g de TFSA (terra fina seca ao ar) foram mantidas em contato com solucoes de CaCl2 0,01 mol L-1 (25 mL), mediante agitacao por 24 h, as quais foram adicionados fosforo (P), na forma de KH2PO4, nas concentracoes de 0-60, 0-80 e 0-110 mg L-1. O P foi analisado no sobrenadante para a determinacao da quantidade adsorvida (P-rem). Para avaliar a capacidade maxima de adsorcao de fosforo (CMAP), os valores de adsorcao foram ajustados a isoterma de Langmuir. Foram realizados testes de correlacao entre CMAP e energia de ligacao, pH, materia orgânica, argila e CTC. Os valores da CMAP situaram-se entre 14,50 e 527,93 mg kg-1 de P no solo. Os solos FT (Bonfim) e LV (ITA) apresentaram maior CMAP. Considerando as classes de solos representativas do Estado, a CMAP nao se correlaciona com nenhum dos atributos avaliados. Nas classes Latossolo e Argissolo, a CMAP tem correlacao negativa e significativa com a energia de ligacao.
6 citations
01 Jan 2018
TL;DR: The stroke in Roraima has an important personal impact, generating significant disability in those treated with supportive therapy and a significant increase in the demand for government benefits, associated with a significant decrease in personal income and the contribution in family income, due to unemployment and retirement.
Abstract: Background: Cerebrovascular diseases (CVD) are a public health problem in Brazil. In Roraima, the problem may be even more serious, since there is no specific acute phase treatment capable of modifying the natural history of stoke. Objective: to evaluate the clinical and socioeconomic consequences of the stroke in Roraima, a Brazilian state in Amazonian region. Method: Observational, descriptive, quantitative cohort study. Fifty adult patients were included consecutively, when they were treated and diagnosed with stroke in the General Hospital of Roraima from 01/01/2016 to 06/30/2016. The patients were followed up during hospitalization and reassessed six months after the event, as an outpatient setting. Sociodemographic and clinical data were analyzed in the study as descriptive and explanatory variables. As outcome variables were considered the labor/social security situation and definitive functional sequels. For the evaluation of the definitive functional incapacity the modified Rankin scale was used. Results: The stroke in Roraima has an important personal impact, generating significant disability in those treated with supportive therapy. There was no statistically significant difference in the degree of disability at admission and six months after the reevaluation. There was a significant increase in the demand for government benefits, associated with a significant decrease in personal income and the contribution in family income, due to unemployment and retirement. Conclusion: this study highlights the need and importance of health managers to invest in treatment programs that may modify the natural history of the disease in the state of Roraima, due to its high clinical, social and economic impact.
6 citations
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TL;DR: The results with RpLec reveal the potential importance of this little studied molecule in the insect vector immune response and homeostasis of the gut bacterial microbiota.
Abstract: Lectins are ubiquitous proteins involved in the immune defenses of different organisms and mainly responsible for non-self-recognition and agglutination reactions. This work describes molecular and biological characterization of a rhamnose-binding lectin (RBL) from Rhodnius prolixus, which possesses a 21 amino acid signal peptide and a mature protein of 34.6 kDa. The in-silico analysis of the primary and secondary structures of RpLec revealed a lectin domain fully conserved among previous insects studied. The three-dimensional homology model of RpLec was similar to other RBL-lectins. Docking predictions with the monosaccharides showed rhamnose and galactose-binding sites comparable to Latrophilin-1 and N-Acetylgalactosamine-binding in a different site. The effects of RpLec gene silencing on levels of infecting Trypanosoma cruzi Dm 28c and intestinal bacterial populations in the R. prolixus midgut were studied by injecting RpLec dsRNA into the R. prolixus hemocoel. Whereas T. cruzi numbers remained unchanged compared with the controls, numbers of bacteria increased significantly. The silencing also induced the up regulation of the R. prolixus defC (defensin) expression gene. These results with RpLec reveal the potential importance of this little studied molecule in the insect vector immune response and homeostasis of the gut bacterial microbiota.
6 citations
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TL;DR: In this article, the coordination compounds EuCl3·1.5hmta·H2O, TmCl 3·hmTa·H 2O, Cr(CH3COO)2·2hmta, FeCl3 · hmta·3H 2 O, Co(NO3) 2·3hmta.
Abstract: The coordination compounds EuCl3·1.5hmta·H2O, TmCl3·hmta·H2O, Cr(CH3COO)2·2hmta, FeCl3· hmta·3H2O, Co(NO3)2·3hmta, CuSO4·3hmta, PbCl2·0.5hmta·5H2O, HgCl2·hmta and NiCl2·hmta·H2O (hmta = hexamethylenetetraamine) were synthesized and characterized by elemental analysis, infrared spectroscopy and thermogravimetry. The infrared data are in agreement with coordination through nitrogen. For the hydrated compounds, a first mass-loss step, associated with the release of water molecules, followed by release of an hmta molecule was observed. The anhydrous adducts exhibit a first single-mass loss associated with the release of hmta. For Cr(CH3COO)2·2hmta, the first mass-loss step is due to release of hmta, and the second is due to the acetate, consistent with the proposed structural formula.
6 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 |