Institution
University of South Carolina
Education•Columbia, South Carolina, United States•
About: University of South Carolina is a education organization based out in Columbia, South Carolina, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 25792 authors who have published 59995 publications receiving 2246122 citations. The organization is also known as: USC & U.S.C..
Papers published on a yearly basis
Papers
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TL;DR: Low physical activity was associated with cigarette smoking, marijuana use, lower fruit and vegetable consumption, greater television watching, failure to wear a seat belt, and low perception of academic performance in teenagers.
Abstract: OBJECTIVES: This study examined the associations between physical activity and other health behaviors in a representative sample of US adolescents. METHODS: In the 1990 Youth Risk Behavior Survey, 11631 high school students provided information on physical activity; diet; substance use; and other negative health behaviors. Logistic regression analyses examined associations between physical activity and other health behaviors in a subset of 2652 high-active and 1641 low-active students. RESULTS: Low activity was associated with cigarette smoking, marijuana use, lower fruit and vegetable consumption, greater television watching, failure to wear a seat belt, and low perception of academic performance. For consumption of fruit, television watching, and alcohol consumption, significant interactions were found with race/ethnicity or sex, suggesting that sociocultural factors may affect the relationships between physical activity and some health behaviors. CONCLUSIONS: Low physical activity was associated with s...
492 citations
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TL;DR: It is argued that the causes of a population’s decline are central to the predictability of its extinction, and populations crossing a transcritical bifurcation, experimentally induced by the controlled decline in environmental conditions, show statistical signatures of CSD after the onset of environmental deterioration and before the critical transition.
Abstract: During the decline to extinction, animal populations may present dynamical phenomena not exhibited by robust populations. Some of these phenomena, such as the scaling of demographic variance, are related to small size whereas others result from density-dependent nonlinearities. Although understanding the causes of population extinction has been a central problem in theoretical biology for decades, the ability to anticipate extinction has remained elusive. Here we argue that the causes of a population's decline are central to the predictability of its extinction. Specifically, environmental degradation may cause a tipping point in population dynamics, corresponding to a bifurcation in the underlying population growth equations, beyond which decline to extinction is almost certain. In such cases, imminent extinction will be signalled by critical slowing down (CSD). We conducted an experiment with replicate laboratory populations of Daphnia magna to test this hypothesis. We show that populations crossing a transcritical bifurcation, experimentally induced by the controlled decline in environmental conditions, show statistical signatures of CSD after the onset of environmental deterioration and before the critical transition. Populations in constant environments did not have these patterns. Four statistical indicators all showed evidence of the approaching bifurcation as early as 110 days (∼8 generations) before the transition occurred. Two composite indices improved predictability, and comparative analysis showed that early warning signals based solely on observations in deteriorating environments without reference populations for standardization were hampered by the presence of transient dynamics before the onset of deterioration, pointing to the importance of reliable baseline data before environmental deterioration begins. The universality of bifurcations in models of population dynamics suggests that this phenomenon should be general.
491 citations
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TL;DR: This review evaluates the use of adsorbents from four major categories: agricultural waste; naturally-occurring soil and mineral deposits; aquatic and terrestrial biomass; and other locally-available waste materials.
490 citations
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TL;DR: In this paper, the authors discuss the conceptualization, measurement, and interpretation of centrality in affiliation networks, and present a new conceptualization of centralities that builds on the formal properties of affiliation networks and captures important theoretical insights about the positions of actors and events.
489 citations
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TL;DR: Nucleophilic AGE-inhibitors, such as aminoguanidine and pyridoxamine, which trap reactive carbonyls and inhibit the formation of AGEs in diabetes, also trap bioactive lipids and precursors of ALEs in atherosclerosis.
488 citations
Authors
Showing all 26109 results
Name | H-index | Papers | Citations |
---|---|---|---|
Robert M. Califf | 196 | 1561 | 167961 |
Eric J. Topol | 193 | 1373 | 151025 |
Bernard Rosner | 190 | 1162 | 147661 |
Hyun-Chul Kim | 176 | 4076 | 183227 |
James F. Sallis | 169 | 825 | 144836 |
Steven N. Blair | 165 | 879 | 132929 |
Rodney S. Ruoff | 164 | 666 | 194902 |
David Cella | 156 | 1258 | 106402 |
Claude Bouchard | 153 | 1076 | 115307 |
Wei Zheng | 151 | 1929 | 120209 |
James M. Tour | 143 | 859 | 91364 |
Tim Adye | 143 | 1898 | 109010 |
John D. Scott | 135 | 625 | 83878 |
Anders Pape Møller | 135 | 1034 | 71713 |
Lars Klareskog | 131 | 697 | 63281 |