Institution
Universidade Federal de Rondônia
Education•Porto Velho, Brazil•
About: Universidade Federal de Rondônia is a education organization based out in Porto Velho, Brazil. It is known for research contribution in the topics: Population & Snake venom. The organization has 2232 authors who have published 2614 publications receiving 18062 citations.
Topics: Population, Snake venom, Amazon rainforest, Drainage basin, Venom
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors compare measurements of radiation flux components and turbulent fluxes of energy and CO and show that both flux components are correlated with the turbulent flux of CO and energy.
Abstract: Comparative measurements of radiation flux components and turbulent fluxes of energy and CO
335 citations
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University of São Paulo1, National Institute of Amazonian Research2, Empresa Brasileira de Pesquisa Agropecuária3, University at Albany, SUNY4, University of California, Irvine5, University of Arizona6, Harvard University7, California State University San Marcos8, Universidade Federal de Mato Grosso9, Universidade Federal de Rondônia10, Wageningen University and Research Centre11
TL;DR: In this paper, the seasonal patterns of water vapor and sensible heat flux along a tropical biome gradient from forest to savanna were investigated, and the authors found that evaporation rates increased in the dry season, coincident with increased radiation and soil moisture.
Abstract: [1] We investigated the seasonal patterns of water vapor and sensible heat flux along a tropical biome gradient from forest to savanna. We analyzed data from a network of flux towers in Brazil that were operated within the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA). These tower sites included tropical humid and semideciduous forest, transitional forest, floodplain (with physiognomies of cerrado), and cerrado sensu stricto. The mean annual sensible heat flux at all sites ranged from 20 to 38 Wm 2 , and was generally reduced in the wet season and increased in the late dry season, coincident with seasonal variations of net radiation and soil moisture. The sites were easily divisible into two functional groups based on the seasonality of evaporation: tropical forest and savanna. At sites with an annual precipitation above 1900 mm and a dry season length less than 4 months (Manaus, Santarem and Rondonia), evaporation rates increased in the dry season, coincident with increased radiation. Evaporation rates were as high as 4.0 mm d 1 in these evergreen or semidecidous forests. In contrast, ecosystems with precipitation less than 1700 mm and a longer dry season (Mato Grosso, Tocantins
259 citations
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TL;DR: The findings indicate that the complexity of T. cruzi is larger than currently known, and confirmed bats as important reservoirs and potential source of T.'s cruzi infections to humans.
Abstract: We characterized 15 Trypanosoma cruzi isolates from bats captured in the Amazon, Central and Southeast Brazilian regions. Phylogenetic relationships among T. cruzi lineages using SSU rDNA, cytochrome b, and Histone H2B genes positioned all Amazonian isolates into T. cruzi I (TCI). However, bat isolates from the other regions, which had been genotyped as T. cruzi II (TC II) by the traditional genotyping method based on mini-exon gene employed in this study, were not nested within any of the previously defined TCII sublineages, constituting a new genotype designated as TCbat. Phylogenetic analyses demonstrated that TCbat indeed belongs to T. cruzi and not to other closely related bat trypanosomes of the subgenus Schizotrypanum, and that although separated by large genetic distances TCbat is closest to lineage TCI. A genotyping method targeting ITS1 rDNA distinguished TCbat from established T. cruzi lineages, and from other Schizotrypanum species. In experimentally infected mice, TCbat lacked virulence and yielded low parasitaemias. Isolates of TCbat presented distinctive morphological features and behaviour in triatomines. To date, TCbat genotype was found only in bats from anthropic environments of Central and Southeast Brazil. Our findings indicate that the complexity of T. cruzi is larger than currently known, and confirmed bats as important reservoirs and potential source of T. cruzi infections to humans.
214 citations
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TL;DR: Analysis of soils in western Amazonia finds little evidence for pre-Columbian human occupations there, and indicates that human impacts on interfluvial forests were small, infrequent, and highly localized.
Abstract: Locally extensive pre-Columbian human occupation and modification occurred in the forests of the central and eastern Amazon Basin, but whether comparable impacts extend westward and into the vast terra firme (interfluvial) zones, remains unclear. We analyzed soils from 55 sites across central and western Amazonia to assess the history of human occupation. Sparse occurrences of charcoal and the lack of phytoliths from agricultural and disturbance species in the soils during pre-Columbian times indicated that human impacts on interfluvial forests were small, infrequent, and highly localized. No human artifacts or modified soils were found at any site surveyed. Riverine bluff areas also appeared less heavily occupied and disturbed than similar settings elsewhere. Our data indicate that human impacts on Amazonian forests were heterogeneous across this vast landscape.
194 citations
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TL;DR: 5 nights of partial sleep deprivation is sufficient to cause significant increase in sympathetic activity and venous endothelial dysfunction, which may help to explain the association between short sleep and increased cardiovascular risk in epidemiological studies.
Abstract: Sleep deprivation is common in Western societies and is associated with increased cardiovascular morbidity and mortality in epidemiological studies. However, the effects of partial sleep deprivatio...
191 citations
Authors
Showing all 2255 results
Name | H-index | Papers | Citations |
---|---|---|---|
José G. Dórea | 42 | 226 | 5754 |
Andreimar M. Soares | 38 | 106 | 3423 |
Jean Ricardo Simões Vitule | 32 | 132 | 3266 |
Wanderley Rodrigues Bastos | 31 | 127 | 3007 |
Andreimar M. Soares | 31 | 104 | 3615 |
Pietro Ciancaglini | 30 | 157 | 3206 |
Rodrigo G. Stábeli | 29 | 113 | 2721 |
Gil Guerra-Júnior | 26 | 271 | 3040 |
Mario Alberto Cozzuol | 23 | 56 | 2052 |
Juliana P. Zuliani | 23 | 85 | 1711 |
Rejane C. Marques | 22 | 42 | 1016 |
Fabrice Duponchelle | 22 | 78 | 1465 |
Leonardo A. Calderon | 20 | 69 | 1092 |
Valdir Alves Facundo | 19 | 85 | 1146 |
Braulio Otomar Caron | 18 | 181 | 1359 |