The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
John A Vucetich - One of the best experts on this subject based on the ideXlab platform.
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tooth Fracture Frequency in gray wolves reflects prey availability
eLife, 2019Co-Authors: Blaire Van Valkenburgh, Douglas W Smith, Rolf O. Peterson, Daniel R Stahler, John A VucetichAbstract:Exceptionally high rates of tooth Fracture in large Pleistocene carnivorans imply intensified interspecific competition, given that tooth Fracture rises with increased bone consumption, a behavior that likely occurs when prey are difficult to acquire. To assess the link between prey availability and dental attrition, we documented dental Fracture rates over decades among three well-studied populations of extant gray wolves that differed in prey:predator ratio and levels of carcass utilization. When prey:predator ratios declined, kills were more fully consumed, and rates of tooth Fracture more than doubled. This supports tooth Fracture Frequency as a relative measure of the difficulty of acquiring prey, and reveals a rapid response to diminished food levels in large carnivores despite risks of infection and reduced fitness due to dental injuries. More broadly, large carnivore tooth Fracture Frequency likely reflects energetic stress, an aspect of predator success that is challenging to quantify in wild populations.
Milan M. Mitkovic - One of the best experts on this subject based on the ideXlab platform.
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Influence of coronavirus disease 2019 pandemic state of emergency in orthopaedic Fracture surgical treatment
International Orthopaedics, 2020Co-Authors: Sasa Milenkovic, Marko Bumbasirevic, Djordje Gajdobranski, Vojislav Bumbasirevic, Milan M. MitkovicAbstract:Purpose After the appearance of first COVID-19 cases in Serbia, state of emergency was declared on 15 March 2020 and lasted for 54 days. The aim of this report is to compare orthopaedic Fracture frequencies in this period, when the walk was limited at the home mostly, with those during the same part in the previous year with regular state, thus to examine staying at home as a factor influencing the Frequency of different Fracture types. Methods There were 86 patients during the state of emergency in year 2020 and 106 patients during the same part of year 2019 with a regular state, having orthopaedic trauma surgery. Number of Fractures, gender distribution, and age of patients have been compared between these periods. Results Total number of Fractures decreased for about 19% during the state of emergency. There was nonsignificant difference in Fracture Frequency for all skeletal areas ( p > 0.05), except for distal femoral Fractures which occurred more often during the state of emergency ( p
Blaire Van Valkenburgh - One of the best experts on this subject based on the ideXlab platform.
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tooth Fracture Frequency in gray wolves reflects prey availability
eLife, 2019Co-Authors: Blaire Van Valkenburgh, Douglas W Smith, Rolf O. Peterson, Daniel R Stahler, John A VucetichAbstract:Exceptionally high rates of tooth Fracture in large Pleistocene carnivorans imply intensified interspecific competition, given that tooth Fracture rises with increased bone consumption, a behavior that likely occurs when prey are difficult to acquire. To assess the link between prey availability and dental attrition, we documented dental Fracture rates over decades among three well-studied populations of extant gray wolves that differed in prey:predator ratio and levels of carcass utilization. When prey:predator ratios declined, kills were more fully consumed, and rates of tooth Fracture more than doubled. This supports tooth Fracture Frequency as a relative measure of the difficulty of acquiring prey, and reveals a rapid response to diminished food levels in large carnivores despite risks of infection and reduced fitness due to dental injuries. More broadly, large carnivore tooth Fracture Frequency likely reflects energetic stress, an aspect of predator success that is challenging to quantify in wild populations.
Luis Moreno - One of the best experts on this subject based on the ideXlab platform.
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Prediction of some in situ tracer tests with sorbing tracers using independent data.
Journal of Contaminant Hydrology, 2003Co-Authors: Ivars Neretnieks, Luis MorenoAbstract:Some recent converging tracer tests with sorbing tracers at the Aspo Hard Rock Laboratory in Sweden, the TRUE tests, have been predicted using only laboratory data and hydraulic data from borehole measurements. No model parameters were adjusted to obtain a better fit with the experiments. The independent data were Fracture Frequency and transmissivity data obtained in the field and laboratory data on sorption and matrix diffusion. Transmissivity measurements in five boreholes in the rock volume containing the region surrounding the injection and collection points show that there is a high Frequency of water conducting Fractures. Of 162 packed off sections with 0.5 m packer distances, 112 were found to have a transmissivity above the detection limit. The specific flow-wetted surface (FWS) of the rock mass could be estimated from these data. The transmissivities were found to be reasonably well described by a lognormal distribution. Laboratory data on diffusion and sorption properties together with the hydraulic data were used to predict the residence time distribution (RTD) of the sorbing tracers. The results were compared with the experimental breakthrough curves. In these experiments, the water residence time is very small compared to the residence time of the sorbing tracers due to their diffusion and sorption within the rock matrix. We thus could neglect the influence of the water residence time in our predictions. Therefore, no information on water residence times or on dispersion was needed. The dispersion of the sorbing tracers is caused by the different sorbing tracer residence times in different pathways. The sorbing tracer residence time is determined by the ratio of flowrate to the flow-wetted surface in the different pathways and not by the water residence time. Assuming a three-dimensional flow pattern and using the observed Fracture Frequency and flowrate distribution, breakthrough curves for three strongly sorbing tracers were predicted. Only the laboratory data, the transmissivity measurements and the pumping flowrate were used in the predictions. No information on the water residence time as obtained by the nonsorbing tracers was used. The predictions were surprisingly accurate.
Engin Uluç - One of the best experts on this subject based on the ideXlab platform.
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Isolated Tympanic Plate Fracture Frequency and Its Relationship to Mandibular Trauma
Canadian Association of Radiologists journal = Journal l'Association canadienne des radiologistes, 2014Co-Authors: Canan Altay, Nezahat Erdogan, Ozan Batkı, Erdem Eren, Sedat Altay, Şebnem Karasu, Berna Dirim Mete, Engin UluçAbstract:Abstract Purpose This study evaluated the prevalence of isolated tympanic Fractures and their correlation with mandibular Fractures by using maxillofacial computed tomography (CT). Materials and Methods We retrospectively evaluated the maxillofacial CT of 1590 patients who presented to our emergency department with maxillofacial trauma between December 2010 and December 2012. Maxillofacial CT was used as the criterion standard for evaluating patients with maxillofacial Fractures. The CT images were evaluated by using an electronic picture archiving and communications system and interpreted independently by 2 radiologists. Results The maxillofacial CT images revealed mandibular Fractures in 167 of the patients and isolated tympanic plate Fractures in 35 of these 167 patients. Four patients (11%) had a bilateral tympanic plate Fracture, and 31 patients (89%) had unilateral tympanic plate Fracture. Of all the tympanic plate Fractures, 19 (54%) were on the right side and 16 (46%) were on the left side ( P > .05). In our results, a significant correlation between the presence of a right-sided tympanic plate Fracture and Fracture of the ipsilateral condylar process was found ( P = .036). However, a statistically significant difference between the presence of a tympanic plate Fracture and other mandible Fractures, additional soft-tissue findings, or the number of Fractures was not determined ( P > .05). Sex had no impact on the presence of tympanic plate Fracture ( P > .05). Conclusion The Frequency of isolated tympanic plate Fractures in maxillofacial trauma is low, but it is an important anatomic location. Condyle Fractures are significantly associated with isolated tympanic plate Fractures. The presence of these injuries should raise suspicion of a concomitant isolated tympanic plate Fracture.
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Neuroradiology / Neuroradiologie Isolated Tympanic Plate Fracture Frequency and Its Relationship to Mandibular Trauma
2014Co-Authors: Canan Altay, Erdem Eren, Sedat Altay, Berna Dirim Mete, Engin UluçAbstract:Purpose: This study evaluated the prevalence of isolated tympanic Fractures and their correlation with mandibular Fractures by using maxillofacial computed tomography (CT). Materials and Methods: We retrospectively evaluated the maxillofacial CT of 1590 patients who presented to our emergency department with maxillofacial trauma between December 2010 and December 2012. Maxillofacial CT was used as the criterion standard for evaluating patients with maxillofacial Fractures. The CT images were evaluated by using an electronic picture archiving and communications system and interpreted independently by 2 radiologists. Results: The maxillofacial CT images revealed mandibular Fractures in 167 of the patients and isolated tympanic plate Fractures in 35 of these 167 patients. Four patients (11%) had a bilateral tympanic plate Fracture, and 31 patients (89%) had unilateral tympanic plate Fracture. Of all the tympanic plate Fractures, 19 (54%) were on the right side and 16 (46%) were on the left side (P >.05). In our results, a significant correlation between the presence of a right-sided tympanic plate Fracture and Fracture of the ipsilateral condylar process was found (P ¼ .036). However, a statistically significant difference between the presence of a tympanic plate Fracture and other mandible Fractures, additional soft-tissue findings, or the number of Fractures was not determined (P >.05). Sex had no impact on the presence of tympanic plate Fracture (P > .05). Conclusion: The Frequency of isolated tympanic plate Fractures in maxillofacial trauma is low, but it is an important anatomic location. Condyle Fractures are significantly associated with isolated tympanic plate Fractures. The presence of these injuries should raise suspicion of a concomitant isolated tympanic plate Fracture.
