Institution
Vanderbilt University
Education•Nashville, Tennessee, United States•
About: Vanderbilt University is a education organization based out in Nashville, Tennessee, United States. It is known for research contribution in the topics: Population & Cancer. The organization has 45066 authors who have published 106528 publications receiving 5435039 citations. The organization is also known as: Vandy.
Topics: Population, Cancer, Receptor, Health care, Poison control
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a nonlinear lumped-parameter model of a piezoelectric stack actuator was developed to describe actuator behavior for purposes of control system analysis and design, and in particular for microrobotic applications requiring accurate position and/or force control.
Abstract: A nonlinear lumped-parameter model of a piezoelectric stack actuator has been developed to describe actuator behavior for purposes of control system analysis and design, and, in particular, for microrobotic applications requiring accurate position and/or force control. In formulating this model, the authors propose a generalized Maxwell resistive capacitor as a lumped-parameter causal representation of rate-independent hysteresis. Model formulation is validated by comparing results of numerical simulations to experimental data. Validation is followed by a discussion of model implications for purposes of actuator control.
659 citations
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TL;DR: In this article, the authors reviewed decision rules used in the past to identify wearing period, minimal wear requirement for a valid day, spurious data, number of days used to calculate the outcome variables and extract bouts of moderate to vigorous physical activity (MVPA).
Abstract: Purpose: Accelerometers are recognized as a valid and objective tool to assess free-living physical activity. Despite the widespread use of accelerometers, there is no standardized way to process and summarize data from them, which limits our ability to compare results across studies. This paper a) reviews decision rules researchers have used in the past, b) compares the impact of using different decision rules on a common data set, and c) identifies issues to consider for accelerometer data reduction. Methods: The methods sections of studies published in 2003 and 2004 were reviewed to determine what decision rules previous researchers have used to identify wearing period, minimal wear requirement for a valid day, spurious data, number of days used to calculate the outcome variables, and extract bouts of moderate to vigorous physical activity (MVPA). For this study, four data reduction algorithms that employ different decision rules were used to analyze the same data set. Results: The review showed that among studies that reported their decision rules, much variability was observed. Overall, the analyses suggested that using different algorithms impacted several important outcome variables. The most stringent algorithm yielded significantly lower wearing time, the lowest activity counts per minute and counts per day, and fewer minutes of MVPA per day. An exploratory sensitivity analysis revealed that the most stringent inclusion criterion had an impact on sample size and wearing time, which in turn affected many outcome variables. Conclusions: These findings suggest that the decision rules employed to process accelerometer data have a significant impact on important outcome variables. Until guidelines are developed, it will remain difficult to compare findings across studies.
658 citations
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TL;DR: The O-dealkylation of pentoxyresorufin by rat liver microsomes was examined and it was observed that this activity, in microsome for Aroclor-pretreated rats, was dependent on O2 and was inhibited by metyrapone and SKF 525-A, indicative of cytochrome P-450 mediation in the reaction.
658 citations
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Alvaro N. Barbeira1, Scott P. Dickinson1, Rodrigo Bonazzola1, Jiamao Zheng1 +260 more•Institutions (43)
TL;DR: A mathematical expression is derived to compute PrediXcan results using summary data, and the effects of gene expression variation on human phenotypes in 44 GTEx tissues and >100 phenotypes are investigated.
Abstract: Scalable, integrative methods to understand mechanisms that link genetic variants with phenotypes are needed. Here we derive a mathematical expression to compute PrediXcan (a gene mapping approach) results using summary data (S-PrediXcan) and show its accuracy and general robustness to misspecified reference sets. We apply this framework to 44 GTEx tissues and 100+ phenotypes from GWAS and meta-analysis studies, creating a growing public catalog of associations that seeks to capture the effects of gene expression variation on human phenotypes. Replication in an independent cohort is shown. Most of the associations are tissue specific, suggesting context specificity of the trait etiology. Colocalized significant associations in unexpected tissues underscore the need for an agnostic scanning of multiple contexts to improve our ability to detect causal regulatory mechanisms. Monogenic disease genes are enriched among significant associations for related traits, suggesting that smaller alterations of these genes may cause a spectrum of milder phenotypes.
657 citations
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University of Pennsylvania1, University of Florida2, Primary Children's Hospital3, Washington University in St. Louis4, National Institutes of Health5, Mayo Clinic6, University of Texas Medical Branch7, Marshfield Clinic8, University of California, San Francisco9, Henry Ford Health System10, University of Maryland, Baltimore11, University of Alabama at Birmingham12, Vanderbilt University13, Tulane University14, Icahn School of Medicine at Mount Sinai15, Duke University16, Yeshiva University17, University of Utah18, Harvard University19
TL;DR: Genotype-guided dosing of warfarin did not improve anticoagulation control during the first 4 weeks of therapy and there was a significant interaction between dosing strategy and race.
Abstract: Background The clinical utility of genotype-guided (pharmacogenetically based) dosing of warfarin has been tested only in small clinical trials or observational studies, with equivocal results. Methods We randomly assigned 1015 patients to receive doses of warfarin during the first 5 days of therapy that were determined according to a dosing algorithm that included both clinical variables and genotype data or to one that included clinical variables only. All patients and clinicians were unaware of the dose of warfarin during the first 4 weeks of therapy. The primary outcome was the percentage of time that the international normalized ratio (INR) was in the therapeutic range from day 4 or 5 through day 28 of therapy. Results At 4 weeks, the mean percentage of time in the therapeutic range was 45.2% in the genotype-guided group and 45.4% in the clinically guided group (adjusted mean difference, [genotype-guided group minus clinically guided group], −0.2; 95% confidence interval, −3.4 to 3.1; P=0.91). There ...
656 citations
Authors
Showing all 45403 results
Name | H-index | Papers | Citations |
---|---|---|---|
Walter C. Willett | 334 | 2399 | 413322 |
Meir J. Stampfer | 277 | 1414 | 283776 |
John Q. Trojanowski | 226 | 1467 | 213948 |
Robert M. Califf | 196 | 1561 | 167961 |
Matthew Meyerson | 194 | 553 | 243726 |
Scott M. Grundy | 187 | 841 | 231821 |
Tony Hunter | 175 | 593 | 124726 |
David R. Jacobs | 165 | 1262 | 113892 |
Donald E. Ingber | 164 | 610 | 100682 |
L. Joseph Melton | 161 | 531 | 97861 |
Ralph A. DeFronzo | 160 | 759 | 132993 |
David W. Bates | 159 | 1239 | 116698 |
Charles N. Serhan | 158 | 728 | 84810 |
David Cella | 156 | 1258 | 106402 |
Jay Hauser | 155 | 2145 | 132683 |