Institution
Universidade Federal de Minas Gerais
Education•Belo Horizonte, Minas Gerais, Brazil•
About: Universidade Federal de Minas Gerais is a education organization based out in Belo Horizonte, Minas Gerais, Brazil. It is known for research contribution in the topics: Population & Context (language use). The organization has 41631 authors who have published 75688 publications receiving 1249905 citations.
Topics: Population, Context (language use), Medicine, Immune system, Health care
Papers published on a yearly basis
Papers
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TL;DR: IAH provokes the release of pro-inflammatory cytokines which may serve as a second insult for the induction of MOF, and the effects on remote organ injury are determined.
Abstract: Background The abdominal compartment syndrome (ACS) has been implicated in the pathogenesis of postinjury multiple organ failure. The ACS is defined as intra-abdominal hypertension causing adverse physiologic response. This study was designed to determine the effects of IAH on the production of interleukin-1b (IL-1beta), interleukin-6 (IL-6), tumor necrosis factor (TNF-alpha), and the effects on remote organ injury. Methods IAH was induced in Sprague-Dawley rats which were divided into 5 groups, 10 animals each. Intra-abdominal pressure (IAP) was increased to 20 mm Hg for 60 and 90 minutes in two different groups. In a third group following IAP of 20 mm Hg the abdomen was decompressed for 30 minutes before samples were collected. The other animals were used as controls. Hemodynamic response was monitored throughout the procedure. Cytokine levels were assessed in the plasma. Remote organ injury was assessed by histopathology and myeloperoxidase activity. Results IAH caused a significant decrease in MAP. After abdominal decompression MAP returned to baseline levels. A significant decrease in arterial pH was also noted. Increase in the levels of TNF-alpha and IL-6 was noted 30 minutes after abdominal decompression. Plasma concentration of IL-1b was elevated after 60 minutes of IAH. Abdominal decompression, however, did not cause a significant increase in the levels of this cytokine. Lung neutrophil accumulation was significantly elevated only after abdominal decompression. Histopathological findings showed intense pulmonary inflammatory infiltration including atelectasis and alveolar edema. Conclusions IAH provokes the release of pro-inflammatory cytokines which may serve as a second insult for the induction of MOF.
160 citations
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Finnish Environment Institute1, Universidade Federal de Goiás2, University of Zurich3, Swiss Federal Institute of Aquatic Science and Technology4, Universiti Sains Malaysia5, University of Tabuk6, Swedish University of Agricultural Sciences7, University of Barcelona8, National Scientific and Technical Research Council9, Universidade Federal de Minas Gerais10, University of Guelph11, Pontificia Universidad Católica del Ecuador12, Institut de recherche pour le développement13, University of Hong Kong14, Universidad San Francisco de Quito15, Aarhus University16, National Institute of Amazonian Research17, University of Copenhagen18, Federal University of Mato Grosso do Sul19, University of Basel20, Hungarian Academy of Sciences21, Stellenbosch University22, Sao Paulo State University23, University of Canberra24, University of Otago25
TL;DR: The hypotheses that beta diversity should increase with decreasing latitude and increase with spatial extent of a region have rarely been tested based on a comparative analysis of multiple datasets, and no such study has focused on stream insects.
Abstract: The hypotheses that beta diversity should increase with decreasing latitude and increase with spatial extent of a region have rarely been tested based on a comparative analysis of multiple datasets, and no such study has focused on stream insects. We first assessed how well variability in beta diversity of stream insect metacommunities is predicted by insect group, latitude, spatial extent, altitudinal range, and dataset properties across multiple drainage basins throughout the world. Second, we assessed the relative roles of environmental and spatial factors in driving variation in assemblage composition within each drainage basin. Our analyses were based on a dataset of 95 stream insect metacommunities from 31 drainage basins distributed around the world. We used dissimilarity-based indices to quantify beta diversity for each metacommunity and, subsequently, regressed beta diversity on insect group, latitude, spatial extent, altitudinal range, and dataset properties (e.g., number of sites and percentage of presences). Within each metacommunity, we used a combination of spatial eigenfunction analyses and partial redundancy analysis to partition variation in assemblage structure into environmental, shared, spatial, and unexplained fractions. We found that dataset properties were more important predictors of beta diversity than ecological and geographical factors across multiple drainage basins. In the within-basin analyses, environmental and spatial variables were generally poor predictors of variation in assemblage composition. Our results revealed deviation from general biodiversity patterns because beta diversity did not show the expected decreasing trend with latitude. Our results also call for reconsideration of just how predictable stream assemblages are along ecological gradients, with implications for environmental assessment and conservation decisions. Our findings may also be applicable to other dynamic systems where predictability is low.
160 citations
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TL;DR: The results of a study on the structure of a large collection of open-source programs developed in Java indicate that the proposed thresholds can support the identification of classes which violate design principles, as well as the Identification of well-designed classes.
159 citations
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TL;DR: This work addresses the synthesis of controllers for a swarm of robots to generate a desired two-dimensional geometric pattern specified by a simple closed planar curve with local interactions for avoiding collisions or maintaining specified relative distance constraints.
Abstract: We address the synthesis of controllers for a swarm of robots to generate a desired two-dimensional geometric pattern specified by a simple closed planar curve with local interactions for avoiding collisions or maintaining specified relative distance constraints. The controllers are decentralized in the sense that the robots do not need to exchange or know each other's state information. Instead, we assume that the robots have sensors allowing them to obtain information about relative positions of neighbors within a known range. We establish stability and convergence properties of the controllers for a certain class of simple closed curves. We illustrate our approach through simulations and consider extensions to more general planar curves.
159 citations
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California Institute of Technology1, Janssen Pharmaceutica2, Universidade Federal de Minas Gerais3, Centre national de la recherche scientifique4, California State University5, Spanish National Research Council6, INAF7, University of Georgia8, Smith College9, University of Michigan10, University of Wisconsin-Madison11, Lowell Observatory12, Wesleyan University13, Harvard University14, University of Oxford15, European Space Agency16
TL;DR: In this article, the authors provided high quality, multi-wavelength light curves for young stellar objects (YSOs) whose optical variability is dominated by short duration flux bursts, which they infer are due to enhanced mass accretion rates.
Abstract: Based on more than four weeks of continuous high cadence photometric monitoring of several hundred members of the young cluster NGC 2264 with two space telescopes, NASA’s Spitzer and the CNES CoRoT (Convection, Rotation, and planetary Transits), we provide high quality, multi-wavelength light curves for young stellar objects (YSOs) whose optical variability is dominated by short duration
flux bursts, which we infer are due to enhanced mass accretion rates. These light curves show many
brief – several hour to one day – brightenings at optical and near-infrared (IR) wavelengths with
amplitudes generally in the range 5-50% of the quiescent value. Typically, a dozen or more of these
bursts occur in a thirty day period. We demonstrate that stars exhibiting this type of variability have
large ultraviolet (UV) excesses and dominate the portion of the u − g vs. g − r color-color diagram
with the largest UV excesses. These stars also have large Hɑ equivalent widths, and either centrally
peaked, lumpy Hɑ emission profiles or profiles with blue-shifted absorption dips associated with disk
or stellar winds. Light curves of this type have been predicted for stars whose accretion is dominated
by Rayleigh-Taylor instabilities at the boundary between their magnetosphere and inner circumstellar disk, or where magneto-rotational instabilities modulate the accretion rate from the inner disk. Amongst the stars with the largest UV excesses or largest Hɑ equivalent widths, light curves with this type of variability greatly outnumber light curves with relatively smooth sinusoidal variations
associated with long-lived hot spots. We provide quantitative statistics for the average duration and
strength of the accretion bursts and for the fraction of the accretion luminosity associated with these
bursts.
159 citations
Authors
Showing all 42077 results
Name | H-index | Papers | Citations |
---|---|---|---|
Michael Marmot | 193 | 1147 | 170338 |
Pulickel M. Ajayan | 176 | 1223 | 136241 |
Alan D. Lopez | 172 | 863 | 259291 |
Jens Nielsen | 149 | 1752 | 104005 |
Mildred S. Dresselhaus | 136 | 762 | 112525 |
Jing Kong | 126 | 553 | 72354 |
Mauricio Terrones | 118 | 760 | 61202 |
Michael Brammer | 118 | 424 | 46763 |
Terence G. Langdon | 117 | 1158 | 61603 |
Caroline A. Sabin | 108 | 690 | 44233 |
Michael Brauer | 106 | 480 | 73664 |
Michael Bader | 103 | 735 | 37525 |
Michael S. Strano | 98 | 480 | 60141 |
Pablo Jarillo-Herrero | 91 | 245 | 39171 |
Riichiro Saito | 91 | 502 | 48869 |