Institution
Universidade Estadual de Londrina
Education•Londrina, Brazil•
About: Universidade Estadual de Londrina is a education organization based out in Londrina, Brazil. It is known for research contribution in the topics: Population & Toxoplasma gondii. The organization has 13052 authors who have published 19291 publications receiving 212123 citations.
Topics: Population, Toxoplasma gondii, Oxidative stress, Starch, Germination
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the superoxide radical anion O2− from tetra(4-carboxyphenyl)porphyrin (TCPP) adsorbed on TiO2 in DMSO and irradiated by visible light was studied using EPR spectroscopy.
Abstract: The generation of superoxide radical anion O2− from tetra(4-carboxyphenyl)porphyrin (TCPP) adsorbed on TiO2 in DMSO and irradiated by visible light was studied using EPR spectroscopy and 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as spin trap. A chemical filter was used to remove light with wave lengths <500 nm. A multiline EPR spectrum was observed, characteristic of a mixture of two adducts, the first corresponding to DMPO–O2− and the second to the so-called nitroxide-like radical. Hyperfine coupling constants determined for the DMPO–O2− adduct are: aN = 14.1 G, aHβ = 10.8 G and aHγ = 1.4 G, and for the nitroxide-like radical adduct aN = 14 G. An increased intensity of the EPR lines corresponding to the nitroxide-like radical adduct was observed under irradiation without chemical filter, which suggests a possible DMPO–O2− decomposition. No singlet oxygen could be detected by EPR spectroscopy using 2,2,6,6-tetramethyl-4-piperidone (TEMP) as spin trap and by chemical trapping using anthracene as the trap.
102 citations
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TL;DR: Radiodensity was similar within enamel groups, but bovine dentin presented higher radiodensity than human one regardless of age groups, and enamel was always more radiodense than dentin and also presented higher KHN (p=0.001).
102 citations
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Max Planck Society1, Technische Universität München2, RWTH Aachen University3, University of Chicago4, University of Alabama5, Universidade Estadual de Londrina6, Argonne National Laboratory7, Kurchatov Institute8, Tohoku University9, State University of Campinas10, Kobe University11, University of Tübingen12, Tokyo Institute of Technology13, Kitasato University14, University of Bordeaux15, Drexel University16, University of Notre Dame17, Tokyo Metropolitan University18, Virginia Tech19, Arcadia University20, Spanish National Research Council21, South Dakota School of Mines and Technology22, Stony Brook University23
TL;DR: The Double Chooz experiment as mentioned in this paper measured the mixing angle θ13 with the new total neutron capture detection technique from the full data set, yielding sin2(2θ13)
Abstract: Neutrinos were assumed to be massless particles until the discovery of the neutrino oscillation process. This phenomenon indicates that the neutrinos have non-zero masses and the mass eigenstates (ν1, ν2, ν3) are mixtures of their flavour eigenstates (νe, νμ, ντ). The oscillations between different flavour eigenstates are described by three mixing angles (θ12, θ23, θ13), two differences of the squared neutrino masses of the ν2/ν1 and ν3/ν1 pairs and a charge conjugation parity symmetry violating phase δCP. The Double Chooz experiment, located near the Chooz Electricite de France reactors, measures the oscillation parameter θ13 using reactor neutrinos. Here, the Double Chooz collaboration reports the measurement of the mixing angle θ13 with the new total neutron capture detection technique from the full data set, yielding sin2(2θ13) = 0.105 ± 0.014. This measurement exploits the multidetector configuration, the isoflux baseline and data recorded when the reactors were switched off. In addition to the neutrino mixing angle measurement, Double Chooz provides a precise measurement of the reactor neutrino flux, given by the mean cross-section per fission 〈σf〉 = (5.71 ± 0.06) × 10−43 cm2 per fission, and reports an empirical model of the distortion in the reactor neutrino spectrum.
102 citations
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TL;DR: A large hydraulic diversity is found, covering as much as 44% of the global angiosperm variation in P50, suggesting the evolution of a stress-tolerance syndrome to nutrients and drought and has important implications for modelling and predicting forest and species resilience to climate change.
Abstract: Species distribution is strongly driven by local and global gradients in water availability but the underlying mechanisms are not clear. Vulnerability to xylem embolism (P50 ) is a key trait that indicates how species cope with drought and might explain plant distribution patterns across environmental gradients. Here we address its role on species sorting along a hydro-topographical gradient in a central Amazonian rainforest and examine its variance at the community scale. We measured P50 for 28 tree species, soil properties and estimated the hydrological niche of each species using an indicator of distance to the water table (HAND). We found a large hydraulic diversity, covering as much as 44% of the global angiosperm variation in P50 . We show that P50 : contributes to species segregation across a hydro-topographic gradient in the Amazon, and thus to species coexistence; is the result of repeated evolutionary adaptation within closely related taxa; is associated with species tolerance to P-poor soils, suggesting the evolution of a stress-tolerance syndrome to nutrients and drought; and is higher for trees in the valleys than uplands. The large observed hydraulic diversity and its association with topography has important implications for modelling and predicting forest and species resilience to climate change.
102 citations
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Missouri Botanical Garden1, Centre national de la recherche scientifique2, University of São Paulo3, Sao Paulo State University4, Federal University of Pernambuco5, Universidade Estadual de Londrina6, Federal University of Paraná7, Universidade Federal de Viçosa8, Universidade Federal de Santa Catarina9, Conservation International10, Federal University of Rio de Janeiro11
TL;DR: In the state of SÃO PAO, Brazil, there is a legal instrument (SMA 08-2008) whose aim is to increase the effectiveness of tropical forest restoration projects in particular as discussed by the authors.
Abstract: Around the world, there is growing desire and momentum for ecological restoration to happen faster, with better quality, and in more extensive areas. The question we ask is how can laws and governmental regulations best contribute to effective, successful, and broad-scale restoration? In the state of S˜ ao Paulo, Brazil, there is a legal instrument (SMA 08-2008) whose aim is to increase the effectiveness of tropical forest restoration projects in particular. It establishes, among other things, requirements regarding the minimum number of native tree species to be reached within a given period of time in restoration projects and the precise proportion of functional groups or threatened species to be included when reforestation with native species is used as a restoration technique. There are, however, two differing perspectives among Brazilian restoration ecologists on the appropriateness of such detailed legal rules. For some, the rules help increase the chances that mandatory projects of ecological restoration will succeed. For the other group, there is no single way to achieve effective ecosystem restoration, and the existing science and know-how are far from sufficient to establish standardized technical and methodological norms or to justify that such norms be imposed. Both points of view are discussed here, aiming to help those developing new legislation and improving existing laws about ecological restoration. The precedents established in S˜ ao Paulo, and at the federal level in Brazil, and the ongoing debate about those laws are worth considering and possibly applying elsewhere.
102 citations
Authors
Showing all 13138 results
Name | H-index | Papers | Citations |
---|---|---|---|
Michael Maes | 115 | 807 | 52050 |
Fernando Q. Cunha | 88 | 682 | 31501 |
Mariangela Hungria | 67 | 389 | 15219 |
Petar Popovski | 59 | 756 | 21009 |
Waldiceu A. Verri | 54 | 249 | 10311 |
Thiago M. Cunha | 54 | 268 | 9519 |
Emerson Franchini | 52 | 402 | 9620 |
Celso Vataru Nakamura | 51 | 418 | 10908 |
Diego Augusto Santos Silva | 51 | 389 | 53077 |
Susan M. Tarlo | 50 | 263 | 10850 |
Paulo Caramelli | 45 | 366 | 9666 |
Fabio Pitta | 44 | 213 | 11925 |
Joaquim Gama-Rodrigues | 43 | 225 | 8380 |
Ricardo Almeida | 43 | 250 | 7304 |
Hamilton Roschel | 43 | 235 | 5894 |