Institution
University of Calgary
Education•Calgary, Alberta, Canada•
About: University of Calgary is a education organization based out in Calgary, Alberta, Canada. It is known for research contribution in the topics: Population & Health care. The organization has 44284 authors who have published 104970 publications receiving 3669161 citations. The organization is also known as: U of C & UCalgary.
Papers published on a yearly basis
Papers
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TL;DR: It is suggested that visual attention is not a high-speed switching mecha-nism, but a sustained state during which relevant objects become available to influence behaviour, consistent with recent physiological results in the monkey.
Abstract: In vision, attentional limitations are reflected in interference or reduced accuracy when two objects must be identified at once in a brief display. In our experiments a brief temporal separation was introduced between the two objects to be identified. We measured how long the object continued to interfere with the second, and hence the time course of the first object's attentional demand. According to conventional serial models, attention is assigned rapidly to one object after another, with a dwell time of only a few dozen milliseconds per item. But we report here that interference lasts for several hundred milliseconds--an order of magnitude more than the prediction of conventional models. We suggest that visual attention is not a high-speed switching mechanism, but a sustained state during which relevant objects become available to influence behaviour. This conclusion is consistent with recent physiological results in the monkey.
630 citations
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Massachusetts Institute of Technology1, Boise State University2, National Museum of Natural History3, Santa Fe Institute4, University of California, Riverside5, University of Calgary6, University of Science and Technology of China7, Deakin University8, China University of Mining and Technology9, University of Bremen10
TL;DR: High-precision geochronologic dating constrains probable causes of Earth's largest mass extinction and reveals that the extinction peak occurred just before 252.28 ± 0.08 million years ago, after a decline of 2 per mil (‰) in δ13C over 90,000 years, and coincided with a δ 13C excursion that is estimated to have lasted ≤20,000 Years.
Abstract: The end-Permian mass extinction was the most severe biodiversity crisis in Earth history. To better constrain the timing, and ultimately the causes of this event, we collected a suite of geochronologic, isotopic, and biostratigraphic data on several well-preserved sedimentary sections in South China. High-precision U-Pb dating reveals that the extinction peak occurred just before 252.28 ± 0.08 million years ago, after a decline of 2 per mil (‰) in δ13C over 90,000 years, and coincided with a δ13C excursion of −5‰ that is estimated to have lasted ≤20,000 years. The extinction interval was less than 200,000 years and synchronous in marine and terrestrial realms; associated charcoal-rich and soot-bearing layers indicate widespread wildfires on land. A massive release of thermogenic carbon dioxide and/or methane may have caused the catastrophic extinction.
629 citations
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TL;DR: Sarcopenia predicts postoperative infections, inpatient rehabilitation care and consequently a longer length of stay (LOS) in stage II–IV patients.
Abstract: Sarcopenia is associated with postoperative infection and delayed recovery from colorectal cancer resection surgery
628 citations
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TL;DR: Doppler ultrasound suggests that a component of low-frequency BOLD signal fluctuations is mediated by CO(2)-induced changes in cerebral blood flow (CBF), which is a source of physiological noise and a potentially important confounding factor in fMRI paradigms that modify breathing.
627 citations
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TL;DR: Results including the empirical dispersion term are clearly superior to all pure density functionals investigated and even surpass the MP2/cc‐pVTZ method.
Abstract: Standard density functional theory (DFT) is augmented with a damped empirical dispersion term. The damping function is optimized on a small, well balanced set of 22 van der Waals (vdW) complexes and verified on a validation set of 58 vdW complexes. Both sets contain biologically relevant molecules such as nucleic acid bases. Results are in remarkable agreement with reference high-level wave function data based on the CCSD(T) method. The geometries obtained by full gradient optimization are in very good agreement with the best available theoretical reference. In terms of the standard deviation and average errors, results including the empirical dispersion term are clearly superior to all pure density functionals investigated-B-LYP, B3-LYP, PBE, TPSS, TPSSh, and BH-LYP-and even surpass the MP2/cc-pVTZ method. The combination of empirical dispersion with the TPSS functional performs remarkably well. The most critical part of the empirical dispersion approach is the damping function. The damping parameters should be optimized for each density functional/basis set combination separately. To keep the method simple, we optimized mainly a single factor, s(R), scaling globally the vdW radii. For good results, a basis set of at least triple-zeta quality is required and diffuse functions are recommended, since the basis set superposition error seriously deteriorates the results. On average, the dispersion contribution to the interaction energy missing in the DFT functionals examined here is about 15 and 100% for the hydrogen-bonded and stacked complexes considered, respectively.
627 citations
Authors
Showing all 44775 results
Name | H-index | Papers | Citations |
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Meir J. Stampfer | 277 | 1414 | 283776 |
Zena Werb | 168 | 473 | 122629 |
William J. Sandborn | 162 | 1317 | 108564 |
Gregg C. Fonarow | 161 | 1676 | 126516 |
David W. Johnson | 160 | 2714 | 140778 |
Jerome I. Rotter | 156 | 1071 | 116296 |
Carl Nathan | 135 | 430 | 91535 |
Severine Vermeire | 134 | 1086 | 76352 |
Ian Ford | 134 | 678 | 85769 |
Jeffery D. Molkentin | 131 | 482 | 61594 |
Joseph P. Broderick | 130 | 504 | 72779 |
Shuai Liu | 129 | 1095 | 80823 |
Marcello Tonelli | 128 | 701 | 115576 |
Gary C. Curhan | 128 | 435 | 55348 |
James C. Paulson | 126 | 443 | 52152 |