Institution
Louisiana State University
Education•Baton Rouge, Louisiana, United States•
About: Louisiana State University is a education organization based out in Baton Rouge, Louisiana, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 40206 authors who have published 76587 publications receiving 2566076 citations. The organization is also known as: LSU & Louisiana State University and Agricultural and Mechanical College.
Topics: Population, Poison control, Wetland, Autism, Sediment
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TL;DR: Rosenberg and Kumar (2002) have concluded that the beneficial effect of increasing taxon sample size is not small, but they suggested that the benefit comes simply from the overall increase in size of the data matrix (the total number of characters × taxa).
Abstract: Rosenberg and Kumar (2001) addressed the importance of taxon sampling in phylogenetic analysis and concluded that phylogenetic error is “largely independent of taxon sample size” (2001:10756) and that their “results do not provide evidence in favor of adding taxa to problematic phylogenies” (2001:10756). In response to these conclusions, Zwickl and Hillis (2002) and Pollock et al. (2002) conducted additional simulations and reanalyzed the data presented by Rosenberg and Kumar (2001). Zwickl and Hillis and Pollock et al. showed that these conclusions of Rosenberg and Kumar could not be supported either by analyses of their original data or by new simulations that corrected a number of deficiencies in Rosenberg and Kumar’s original experimental design. Both Zwickl and Hillis and Pollock et al. found that increased taxon sampling resulted in greatly reduced phylogenetic estimation error, and Pollock et al. showed that the benefits of increased taxon sampling were similar to adding an equivalent amount of sequence length for the same taxa (in the ranges simulated by Rosenberg and Kumar).
In their response, Rosenberg and Kumar (2002) focused on a slightly different conclusion from that in their original paper, which was that “longer sequences, rather than extensive sampling, will better improve the accuracy of phylogenetic inference” (2001:10751). In 2001, Rosenberg and Kumar argued that the beneficial effect of increasing taxa was 10-fold lower than the beneficial effect of increasing sequence length and that the effects of increased taxon sampling for the same genes were negligible (“largely independently” of phylogenetic error). Rosenberg and Kumar (2002) have now concluded that the beneficial effect of increasing taxon sample size is not small, but they suggested that the benefit comes simply from the overall increase in size of the data matrix (the total number of characters × taxa). Furthermore, they maintained that there is a greater benefit to increasing the total sequence length for few taxa than can be obtained by increasing taxon sampling for the same genes. Here, we discuss the two sets of conclusions reached by Rosenberg and Kumar (2001, 2002).
326 citations
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TL;DR: In this paper, a parallel molecular-dynamics approach based on dynamic charge transfer among atoms was used for aluminum nanoclusters to investigate the negative pressure in the oxide which dominates the positive pressure due to steric forces.
Abstract: Oxidation of aluminum nanoclusters is investigated with a parallel molecular-dynamics approach based on dynamic charge transfer among atoms. Structural and dynamic correlations reveal that significant charge transfer gives rise to large negative pressure in the oxide which dominates the positive pressure due to steric forces. As a result, aluminum moves outward and oxygen moves towards the interior of the cluster with the aluminum diffusivity $60%$ higher than that of oxygen. A stable 40 \AA{} thick amorphous oxide is formed; this is in excellent agreement with experiments.
326 citations
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TL;DR: The structural, morphological and electrochemical properties of the hydrothermally prepared manganese oxide (MnO 2 ) nanostructures are discussed in this article.
326 citations
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TL;DR: This phylogeny bolsters support for monophyletic waterbird and landbird clades and also strongly supports controversial results from previous studies, including the sister relationship between passerines and parrots and the non-monophyly of raptorial birds in the hawk and falcon families.
Abstract: Evolutionary relationships among birds in Neoaves, the clade comprising the vast majority of avian diversity, have vexed systematists due to the ancient, rapid radiation of numerous lineages. We applied a new phylogenomic approach to resolve relationships in Neoaves using target enrichment (sequence capture) and high-throughput sequencing of ultraconserved elements (UCEs) in avian genomes. We collected sequence data from UCE loci for 32 members of Neoaves and one outgroup (chicken) and analyzed data sets that differed in their amount of missing data. An alignment of 1,541 loci that allowed missing data was 87% complete and resulted in a highly resolved phylogeny with broad agreement between the Bayesian and maximum-likelihood (ML) trees. Although results from the 100% complete matrix of 416 UCE loci were similar, the Bayesian and ML trees differed to a greater extent in this analysis, suggesting that increasing from 416 to 1,541 loci led to increased stability and resolution of the tree. Novel results of our study include surprisingly close relationships between phenotypically divergent bird families, such as tropicbirds (Phaethontidae) and the sunbittern (Eurypygidae) as well as between bustards (Otididae) and turacos (Musophagidae). This phylogeny bolsters support for monophyletic waterbird and landbird clades and also strongly supports controversial results from previous studies, including the sister relationship between passerines and parrots and the non-monophyly of raptorial birds in the hawk and falcon families. Although significant challenges remain to fully resolving some of the deep relationships in Neoaves, especially among lineages outside the waterbirds and landbirds, this study suggests that increased data will yield an increasingly resolved avian phylogeny.
325 citations
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TL;DR: Evaluated risk factors for operative mortality comprehensively across the entire spectrum of cardiac valvular procedures over the past decade illustrate the significance of acute presentation in determining operative risk, and earlier surgical intervention under elective conditions might be emphasized for all types of significant valve lesions.
324 citations
Authors
Showing all 40485 results
Name | H-index | Papers | Citations |
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H. S. Chen | 179 | 2401 | 178529 |
John A. Rogers | 177 | 1341 | 127390 |
Omar M. Yaghi | 165 | 459 | 163918 |
Barry M. Popkin | 157 | 751 | 90453 |
John E. Morley | 154 | 1377 | 97021 |
Claude Bouchard | 153 | 1076 | 115307 |
Ruth J. F. Loos | 142 | 647 | 92485 |
Ali Khademhosseini | 140 | 887 | 76430 |
Shanhui Fan | 139 | 1292 | 82487 |
Joseph E. LeDoux | 139 | 478 | 91500 |
Christopher T. Walsh | 139 | 819 | 74314 |
Kenneth A. Dodge | 138 | 468 | 79640 |
Steven B. Heymsfield | 132 | 679 | 77220 |
George A. Bray | 131 | 896 | 100975 |
Zhanhu Guo | 128 | 886 | 53378 |