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https://www.readbyqxmd.com/read/28544927/estuarine-sediment-resuspension-and-acidification-release-behaviour-of-contaminants-under-different-oxidation-levels-and-acid-sources
#1
M Camino Martín-Torre, Eva Cifrian, Gema Ruiz, Berta Galán, Javier R Viguri
Carbon dioxide (CO2) Capture and Storage (CCS) is a technology to reduce the emissions of this gas to the atmosphere by sequestering it in geological formations. In the case of offshore storage, unexpected CO2 leakages will acidify the marine environment. Reductions of the pH might be also caused by anthropogenic activities or natural events such as acid spills and dredging operations or storms and floods. Changes in the pH of the marine environment will trigger the mobilisation of elements trapped in contaminated shallow sediments with unclear redox boundary...
May 22, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28544622/an-investigation-into-the-two-stage-meta-analytic-copula-modelling-approach-for-evaluating-time-to-event-surrogate-endpoints-which-comprise-of-one-or-more-events-of-interest
#2
Natalie Dimier, Susan Todd
Clinical trials of experimental treatments must be designed with primary endpoints that directly measure clinical benefit for patients. In many disease areas, the recognised gold standard primary endpoint can take many years to mature, leading to challenges in the conduct and quality of clinical studies. There is increasing interest in using shorter-term surrogate endpoints as substitutes for costly long-term clinical trial endpoints; such surrogates need to be selected according to biological plausibility, as well as the ability to reliably predict the unobserved treatment effect on the long-term endpoint...
May 19, 2017: Pharmaceutical Statistics
https://www.readbyqxmd.com/read/28544181/the-k-2-conundrum
#3
Jasmine K Janes, Joshua M Miller, Julian R Dupuis, René M Malenfant, Jamieson C Gorrell, Catherine I Cullingham, Rose L Andrew
Assessments of population genetic structure have become an increasing focus as they can provide valuable insight into patterns of migration and gene flow. STRUCTURE, the most highly cited of several clustering-based methods, was developed to provide robust estimates without the need for populations to be determined a priori. STRUCTURE introduces the problem of selecting the optimal number of clusters and as a result the ΔK method was proposed to assist in the identification of the 'true' number of clusters...
May 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28543951/determination-of-genetic-relatedness-from-low-coverage-human-genome-sequences-using-pedigree-simulations
#4
Michael D Martin, Flora Jay, Sergi Castellano, Montgomery Slatkin
We develop and evaluate methods for inferring relatedness among individuals from low-coverage DNA sequences of their genomes, with particular emphasis on sequences obtained from fossil remains. We suggest the major factors complicating the determination of relatedness among ancient individuals are sequencing depth, the number of overlapping sites, the sequencing error rate, and the presence of contamination from present-day genetic sources. We develop a theoretical model that facilitates the exploration of these factors and their relative effects, via measurement of pairwise genetic distances, without calling genotypes, and determine the power to infer relatedness under various scenarios of varying sequencing depth, present-day contamination, and sequencing error...
May 25, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28543228/scenario-evaluator-for-electrical-resistivity-survey-pre-modeling-tool
#5
Neil Terry, Frederick D Day-Lewis, Judith L Robinson, Lee D Slater, Keith Halford, Andrew Binley, John W Lane, Dale Werkema
Geophysical tools have much to offer users in environmental, water resource, and geotechnical fields; however, techniques such as electrical resistivity imaging (ERI) are often oversold and/or overinterpreted due to a lack of understanding of the limitations of the techniques, such as the appropriate depth intervals or resolution of the methods. The relationship between ERI data and resistivity is nonlinear; therefore, these limitations depend on site conditions and survey design and are best assessed through forward and inverse modeling exercises prior to field investigations...
May 23, 2017: Ground Water
https://www.readbyqxmd.com/read/28541905/inferring-gene-species-assignments-in-the-presence-of-horizontal-gene-transfer
#6
Agnieszka Mykowiecka, Pawel Szczesny, Pawel Gorecki
BACKGROUND: Microbial communities from environmental samples show great diversity as bacteria quickly response to changes in their ecosystems. To assess the scenario of the actual changes, metagenomics experiments aimed at sequencing genomic DNA from such samples are performed. These new obtained sequences together with already known are used to infer phylogenetic trees assessing the taxonomic groups the species with these genes belong to. Here we propose the first approach to the gene-species assignment problem by using reconciliation with horizontal gene transfer...
May 24, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28541542/reducing-stock-outs-of-essential-tuberculosis-medicines-a-system-dynamics-modelling-approach-to-supply-chain-management
#7
L Bam, Z M McLaren, E Coetzee, K H von Leipzig
The under-performance of supply chains presents a significant hindrance to disease control in developing countries. Stock-outs of essential medicines lead to treatment interruption which can force changes in patient drug regimens, drive drug resistance and increase mortality. This study is one of few to quantitatively evaluate the effectiveness of supply chain policies in reducing shortages and costs. This study develops a systems dynamics simulation model of the downstream supply chain for amikacin, a second-line tuberculosis drug using 10 years of South African data...
May 24, 2017: Health Policy and Planning
https://www.readbyqxmd.com/read/28541223/efficient-algorithms-for-genomic-duplication-models
#8
Jaroslaw Paszek, Pawel Gorecki
An important issue in evolutionary molecular biology is to discover genomic duplication episodes and their correspondence to the species tree. Existing approaches vary in the two fundamental aspects: the choice of evolutionary scenarios that model allowed locations of duplications in the species tree, and the rules of clustering gene duplications from gene trees into a single multiple duplication event. Here we study the method of clustering called minimum episodes for several models of allowed evolutionary scenarios with a focus on interval models in which every gene duplication has an interval consisting of allowed locations in the species tree...
May 23, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28541209/pairwise-force-sph-model-for-real-time-multi-interaction-applications
#9
Tao Yang, Ralph R Martin, Ming C Lin, Jian Chang, Shi-Min Hu
In this paper, we present a novel pairwise-force smoothed particle hydrodynamics (PF-SPH) model to allow modeling of various interactions at interfaces in real time. Realistic capture of interactions at interfaces is a challenging problem for SPH-based simulations, especially for scenarios involving multiple interactions at different interfaces. Our PF-SPH model can readily handle multiple kinds of interactions simultaneously in a single simulation; its basis is to use a larger support radius than that used in standard SPH...
May 19, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28541188/a-variable-state-dimension-approach-to-meal-detection-and-meal-size-estimation-in-silico-evaluation-through-basal-bolus-insulin-therapy-for-type-1-diabetes
#10
Jinyu Xie, Qian Wang
OBJECTIVE: This paper aims to develop an algorithm that can detect unannounced meals and estimate meal sizes to achieve a robust glucose control. METHODS: A variable state dimension (VSD) algorithm is developed to detect unannounced meals and estimate meal sizes, where a Kalman filter operates on a quiescent state model when no meal is detected, and switches to a maneuvering state model to estimate meal information once the meal-induced glucose variability is statistically significant...
June 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28540284/prototyping-and-simulation-of-robot-group-intelligence-using-kohonen-networks
#11
Zhijun Wang, Reza Mirdamadi, Qing Wang
Intelligent agents such as robots can form ad hoc networks and replace human being in many dangerous scenarios such as a complicated disaster relief site. This project prototypes and builds a computer simulator to simulate robot kinetics, unsupervised learning using Kohonen networks, as well as group intelligence when an ad hoc network is formed. Each robot is modeled using an object with a simple set of attributes and methods that define its internal states and possible actions it may take under certain circumstances...
September 2016: IOSR J Comput Eng
https://www.readbyqxmd.com/read/28540142/rapid-cycle-deliberate-practice-in-medical-education-a-systematic-review
#12
REVIEW
Jillian Taras, Tobias Everett
Rapid Cycle Deliberate Practice (RCDP) is a novel simulation-based education model that is currently attracting interest, implementation, exploration and research in medical education. In RCDP, learners rapidly cycle between deliberate practice and directed feedback within the simulation scenario until mastery is achieved. The objective of this systematic review is to examine the literature and summarize the existing knowledge on RCDP in simulation-based medical education. Fifteen resources met inclusion criteria; they were diverse and heterogeneous, such that we did not perform a quantitative synthesis or meta-analysis but rather a narrative review on RCDP...
April 19, 2017: Curēus
https://www.readbyqxmd.com/read/28539533/evaluation-of-control-measures-for-bovine-viral-diarrhea-implemented-in-nemuro-district-hokkaido-japan-using-a-scenario-tree-model
#13
Norikazu Isoda, Akihiro Asano, Michiru Ichijo, Shiho Wakamori, Hiroshi Ohno, Kazuhiko Sato, Hirokazu Okamoto, Shigeru Nakao, Hajime Kato, Kazuma Saito, Naoki Ito, Akira Usui, Hiroaki Takayama, Yoshihiro Sakoda
A scenario tree model was developed to propose efficient bovine viral diarrhea (BVD) control measures. The model used field data in eastern Hokkaido where the risk of BVDV infection in cattle has been reduced by an eradication program including mass vaccination, individual tests prior to communal pasture grazing, herd screening tests using bulk milk, and outbreak investigations of newly infected herds. These four activities were then used as hypothesized control measures in the simulation. In each simulation, the numbers of cattle infected persistently and transiently with BVDV detected by clinical manifestations and diagnosis tests and of missed by all of the diagnosis tests were calculated, and the numbers were used as indicators to be compared for the efficacy of the control measures...
May 25, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28538983/assocation-of-a-surgical-task-during-training-with-team-skill-acquisition-among-surgical-residents-the-missing-piece-in-multidisciplinary-team-training
#14
Jessica L Sparks, Dustin L Crouch, Kathryn Sobba, Douglas Evans, Jing Zhang, James E Johnson, Ian Saunders, John Thomas, Sarah Bodin, Ashley Tonidandel, Jeff Carter, Carl Westcott, R Shayn Martin, Amy Hildreth
Importance: The human patient simulators that are currently used in multidisciplinary operating room team training scenarios cannot simulate surgical tasks because they lack a realistic surgical anatomy. Thus, they eliminate the surgeon's primary task in the operating room. The surgical trainee is presented with a significant barrier when he or she attempts to suspend disbelief and engage in the scenario. Objective: To develop and test a simulation-based operating room team training strategy that challenges the communication abilities and teamwork competencies of surgeons while they are engaged in realistic operative maneuvers...
May 24, 2017: JAMA Surgery
https://www.readbyqxmd.com/read/28538110/the-effect-of-individual-movements-and-interventions-on-the-spread-of-influenza-in-long-term-care-facilities
#15
Mehdi Najafi, Marek Laskowski, Pieter T de Boer, Evelyn Williams, Ayman Chit, Seyed M Moghadas
BACKGROUND: Nosocomial influenza poses a serious risk among residents of long-term care facilities (LTCFs). OBJECTIVE: We sought to evaluate the effect of resident and staff movements and contact patterns on the outcomes of various intervention strategies for influenza control in an LTCF. METHODS: We collected contact frequency data in Canada's largest veterans' LTCF by enroling residents and staff into a study that tracked their movements through wireless tags and signal receivers...
May 1, 2017: Medical Decision Making: An International Journal of the Society for Medical Decision Making
https://www.readbyqxmd.com/read/28537275/a-rare-variant-test-for-high-dimensional-data
#16
Marika Kaakinen, Reedik Mägi, Krista Fischer, Jani Heikkinen, Marjo-Riitta Järvelin, Andrew P Morris, Inga Prokopenko
Genome-wide association studies have facilitated the discovery of thousands of loci for hundreds of phenotypes. However, the issue of missing heritability remains unsolved for most complex traits. Locus discovery could be enhanced with both improved power through multi-phenotype analysis (MPA) and use of a wider allele frequency range, including rare variants (RVs). MPA methods for single-variant association have been proposed, but given their low power for RVs, more efficient approaches are required. We propose multi-phenotype analysis of rare variants (MARV), a burden test-based method for RVs extended to the joint analysis of multiple phenotypes through a powerful reverse regression technique...
May 24, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28536545/i-ll-show-you-the-way-risky-driver-behavior-when-following-a-friend
#17
Jaimie McNabb, Michael Kuzel, Rob Gray
Previous research examining social influences on driving behavior has primarily focused on the effects of passengers and surrounding vehicles (e.g., speed contagion). Of current interest was the interaction between drivers that occurs in a "following a friend" scenario, i.e., the driver of one vehicle (the leader) knows how to get to the desired destination while the driver of a second vehicle (the follower) does not. Sixteen participants drove through a simulated city in a driving simulator under three conditions: (i) a baseline condition in which they could choose their own route, (ii) a navigation system condition in which they were given audible route instructions, and (iii) a "follow a friend" condition in which they required to follow a simulated vehicle...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28536534/a-bio-realistic-finite-element-model-to-evaluate-the-effect-of-masticatory-loadings-on-mouse-mandible-related-tissues
#18
Alexander Tsouknidas, Lucia Jimenez-Rojo, Evangelos Karatsis, Nikolaos Michailidis, Thimios A Mitsiadis
Mice are arguably the dominant model organisms for studies investigating the effect of genetic traits on the pathways to mammalian skull and teeth development, thus being integral in exploring craniofacial and dental evolution. The aim of this study is to analyse the functional significance of masticatory loads on the mouse mandible and identify critical stress accumulations that could trigger phenotypic and/or growth alterations in mandible-related structures. To achieve this, a 3D model of mouse skulls was reconstructed based on Micro Computed Tomography measurements...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28535593/simulating-soil-organic-carbon-stock-as-affected-by-land-cover-change-and-climate-change-hyrcanian-forests-northern-iran
#19
Azam Soleimani, Seyed Mohsen Hosseini, Ali Reza Massah Bavani, Mostafa Jafari, Rosa Francaviglia
Soil organic carbon (SOC) contains a considerable portion of the world's terrestrial carbon stock, and is affected by changes in land cover and climate. SOC modeling is a useful approach to assess the impact of land use, land use change and climate change on carbon (C) sequestration. This study aimed to: (i) test the performance of RothC model using data measured from different land covers in Hyrcanian forests (northern Iran); and (ii) predict changes in SOC under different climate change scenarios that may occur in the future...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535339/ecophysiological-examination-of-the-lake-erie-microcystis-bloom-in-2014-linkages-between-biology-and-the-water-supply-shutdown-of-toledo-ohio
#20
Morgan Michelle Steffen, Timothy W Davis, Robert Michael McKay, George S Bullerjahn, Lauren E Krausfeldt, Joshua M A Stough, Michelle L Neitzey, Naomi E Gilbert, Gregory L Boyer, Thomas H Johengen, Duane C Gossiaux, Ashley M Burtner, Danna Palladino, Mark Rowe, Gregory J Dick, Kevin Meyer, Shawn Levy, Braden Boone, Richard Stumpf, Timothy Wynne, Paul V Zimba, Danielle B Gutierrez, Steven W Wilhelm
Annual cyanobacterial blooms dominated by Microcystis have occurred in western Lake Erie (USA/Canada) during summer months since 1995. The production of toxins by bloom-forming cyanobacteria can lead to drinking water crises, such as the one experienced by the city of Toledo in August of 2014, when the city was rendered without drinking water for > 2 days. It is important to understand the conditions and environmental cues that were driving this specific bloom to provide a scientific framework for management of future bloom events...
May 23, 2017: Environmental Science & Technology
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