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https://www.readbyqxmd.com/read/28545218/temporal-variability-in-taxonomic-and-trait-compositions-of-invertebrate-assemblages-in-two-climatic-regions-with-contrasting-flow-regimes
#1
Sylvain Dolédec, Jessica Tilbian, Núria Bonada
CONTEXT: Understanding natural temporal changes in Mediterranean rivers with contrasting flow regimes in relation to those of temperate rivers may prove helpful in predicting effects of climate change on aquatic biodiversity. GOAL: We aimed to compare temporal variability in taxonomic and trait compositions of nearly natural rivers in two climatic regions with varying flow regimes to address the effects of future climate changes on aquatic biodiversity in reference conditions...
May 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28545206/the-performance-of-an-efficient-dairy-system-using-a-combination-of-nitrogen-leaching-mitigation-strategies-in-a-variable-climate
#2
P C Beukes, A J Romera, P Gregorini, K A Macdonald, C B Glassey, M A Shepherd
An efficient dairy system, that implemented a combination of nitrogen (N) leaching mitigation strategies including lower N fertilizer input, standing cows off pasture for part of the day in autumn and winter (stand-off), and importing limited amounts of low protein supplements was evaluated over four consecutive years of a farmlet study. This efficient system consistently demonstrated a lower measured annual N leaching of 40 to 50% compared with a baseline system representing current practice with no mitigations...
May 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28545075/an-improved-ant-colony-optimization-algorithm-with-fault-tolerance-for-job-scheduling-in-grid-computing-systems
#3
Hajara Idris, Absalom E Ezugwu, Sahalu B Junaidu, Aderemi O Adewumi
The Grid scheduler, schedules user jobs on the best available resource in terms of resource characteristics by optimizing job execution time. Resource failure in Grid is no longer an exception but a regular occurring event as resources are increasingly being used by the scientific community to solve computationally intensive problems which typically run for days or even months. It is therefore absolutely essential that these long-running applications are able to tolerate failures and avoid re-computations from scratch after resource failure has occurred, to satisfy the user's Quality of Service (QoS) requirement...
2017: PloS One
https://www.readbyqxmd.com/read/28544822/the-cost-effectiveness-of-tight-control-of-inflammation-in-early-psoriatic-arthritis-economic-analysis-of-the-ticopa-trial
#4
John L O'Dwyer, David M Meads, Claire T Hulme, Lucy McParland, Sarah Brown, Laura C Coates, Anna R Moverley, Paul Emery, Philip G Conaghan, Philip S Helliwell
OBJECTIVE: Treat-to-target approaches have proved to be effective in rheumatoid arthritis, but have not been studied in psoriatic arthritis (PsA). This study was undertaken to examine the cost effectiveness of tight control (TC) of inflammation in early psoriatic arthritis compared to standard care (SC). METHODS: Cost effectiveness analyses were undertaken alongside a UK-based, open-label, multicentre, randomised controlled trial. Taking the perspective of the healthcare sector, effectiveness was measured using EQ-5D-3L which allows the calculation of quality-adjusted life years (QALYs)...
May 23, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28543845/noninnocent-%C3%AE-diiminate-ligands-redox-activity-of-a-bis-alkylimidazole-methane-ligand-in-cobalt-and-zinc-complexes
#5
Pradip Ghosh, Richard Naastepad, Charl F Riemersma, Martin Lutz, Marc-Etienne Moret, Robertus Johannes Klein Gebbink
A new β-diiminate ligand (the bis(1-methyl-4,5-diphenyl-1H-imidazol-2-yl)methane anion, L-) is introduced, in which the ligand framework bears an extended imidazole-based π-system in conjugation with a formal NacNac backbone. Bis-ligated transition metal complexes (Co, Zn) featuring this anionic ligand undergo a series of four consecutive single-electron oxidations that are all ligand based. The singly and doubly oxidized complexes can be synthesized on a preparative scale and have been fully characterized by various spectroscopic techniques...
May 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543843/white-matter-biomarkers-from-fast-protocols-using-axially-symmetric-diffusion-kurtosis-imaging
#6
Brian Hansen, Ahmad R Khan, Noam Shemesh, Torben E Lund, Ryan Sangill, Simon F Eskildsen, Leif Østergaard, Sune N Jespersen
White matter tract integrity (WMTI) can characterize brain microstructure in areas with highly aligned fiber bundles. Several WMTI biomarkers have now been validated against microscopy and provided promising results in studies of brain development and aging, as well as in a number of brain disorders. Currently, WMTI is mostly used in dedicated animal studies and clinical studies of slowly progressing diseases, and has not yet emerged as a routine clinical tool. To this end, a less data intensive experimental method would be beneficial by enabling high resolution validation studies, and ease clinical applications by speeding up data acquisition compared with typical diffusion kurtosis imaging (DKI) protocols utilized as part of WMTI imaging...
May 22, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28543761/experimental-characterization-of-a-direct-conversion-amorphous-selenium-detector-with-thicker-conversion-layer-for-dual-energy-contrast-enhanced-breast-imaging
#7
David A Scadutom, Olivier Tousignant, Wei Zhao
PURPOSE: Dual-energy contrast-enhanced imaging is being investigated as a tool to identify and localize angiogenesis in the breast, a possible indicator of malignant tumors. This imaging technique requires that x-ray images are acquired at energies above the k-shell binding energy of an appropriate radiocontrast agent. Iodinated contrast agents are commonly used for vascular imaging, and require x-ray energies greater than 33 keV. Conventional direct conversion amorphous selenium (a-Se) flat panel imagers for digital mammography show suboptimal absorption efficiencies at these higher energies...
May 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28543689/mild-cognitive-impairment-and-structural-brain-abnormalities-in-a-sexagenarian-with-a-history-of-childhood-traumatic-brain-injury
#8
John Darrell Van Horn, Andrei Irimia, Carinna M Torgerson, Avnish Bhattrai, Zachary Jacokes, Paul M Vespa
In this report, we present a case study involving an older, female patient with a history of pediatric traumatic brain injury (TBI). Magnetic resonance imaging and diffusion tensor imaging volumes were acquired from the volunteer in question, her brain volumetrics and morphometrics were extracted, and these were then systematically compared against corresponding metrics obtained from a large sample of older healthy control (HC) subjects as well as from subjects in various stages of mild cognitive impairment (MCI) and Alzheimer disease (AD)...
May 20, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28543652/what-s-the-use-disparate-purposes-of-u-s-federal-bioethics-commissions
#9
Jenny Dyck Brian, Robert Cook-Deegan
In the forty-year history of U.S. bioethics commissions, these government-sanctioned forums have often demonstrated their power to address pressing problems and to enable policy change. For example, the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, established in 1974, left a legacy of reports that were translated into regulations and had an enormous practical impact. And the 1982 report Splicing Life, by the President's Commission for the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research, became the basis for the National Institutes of Health's Recombinant DNA Advisory Committee as well as for the Food and Drug Administration's developing "Points to Consider" when contemplating the introduction of recombinant DNA into human beings...
May 2017: Hastings Center Report
https://www.readbyqxmd.com/read/28543069/real-time-dynamic-mr-image-reconstruction-using-compressed-sensing-and-principal-component-analysis-cs-pca-demonstration-in-lung-tumor-tracking
#10
Bryson Dietz, Eugene Yip, Jihyun Yun, B Gino Fallone, Keith Wachowicz
PURPOSE: This work presents a real-time dynamic image reconstruction technique, that combines compressed sensing and principal component analysis (CS-PCA), to achieve real-time adaptive radiotherapy with the use of a linac-magnetic resonance imaging system. METHODS: Six retrospective fully sampled dynamic data sets of patients diagnosed with non-small cell lung cancer were used to investigate the CS-PCA algorithm. Using a database of fully sampled k-space, principal components (PC's) were calculated to aid in the reconstruction of undersampled images...
May 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28542325/membrane-protein-contact-and-structure-prediction-using-co-evolution-in-conjunction-with-machine-learning
#11
Pedro L Teixeira, Jeff L Mendenhall, Sten Heinze, Brian Weiner, Marcin J Skwark, Jens Meiler
De novo membrane protein structure prediction is limited to small proteins due to the conformational search space quickly expanding with length. Long-range contacts (24+ amino acid separation)-residue positions distant in sequence, but in close proximity in the structure, are arguably the most effective way to restrict this conformational space. Inverse methods for co-evolutionary analysis predict a global set of position-pair couplings that best explain the observed amino acid co-occurrences, thus distinguishing between evolutionarily explained co-variances and these arising from spurious transitive effects...
2017: PloS One
https://www.readbyqxmd.com/read/28542274/detecting-infection-hotspots-modeling-the-surveillance-challenge-for-elimination-of-lymphatic-filariasis
#12
Julie R Harris, Ryan E Wiegand
BACKGROUND: During the past 20 years, enormous efforts have been expended globally to eliminate lymphatic filariasis (LF) through mass drug administration (MDA). However, small endemic foci (microfoci) of LF may threaten the presumed inevitable decline of infections after MDA cessation. We conducted microsimulation modeling to assess the ability of different types of surveillance to identify microfoci in these settings. METHODS: Five or ten microfoci of radius 1, 2, or 3 km with infection marker prevalence (intensity) of 3, 6, or 10 times background prevalence were placed in spatial simulations, run in R Version 3...
May 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28542099/examining-healthcare-segregation-among-racial-and-ethnic-minorities-receiving-spine-surgical-procedures-in-the-state-of-florida
#13
Andrew J Schoenfeld, Tajdip Sandhu, Daniel J Sturgeon, Kenneth Nwosu, Christopher M Bono
STUDY DESIGN: This was a retrospective review of the Florida Inpatient Dataset (2011-2014). SBJECTIVE: To examine healthcare segregation among African American and Hispanic patients treated with one of four common spine surgical procedures. SUMMARY OF BACKGROUND DATA: Racial and ethnic minorities are known to be at increased risk of adverse events following spine surgery. Healthcare segregation has been proposed as a source for these disparities, but has not been systematically examined for patients undergoing spine surgery...
May 24, 2017: Spine
https://www.readbyqxmd.com/read/28541965/increasing-health-portal-utilization-in-cardiac-ambulatory-patients-a-pilot-project
#14
Carmen L Shaw, Gayle L Casterline, Dennis Taylor, Maureen Fogle, Bradi Granger
Increasing health portal participation actively engages patients in their care and improves outcomes. The primary aim for this project was to increase patient health portal utilization. Nurses used a tablet-based demo to teach patients how to navigate the health portal. Assigning health videos to the portal was a tactic used to increase utilization. Each patient participant was surveyed about health portal utilization at initial nurse navigator appointment, day of procedure, and 30 days after discharge. Seventy-three percent (n = 14) of the 19 selected patients received the intervention; 36% (n = 4) of patients reported using a health portal feature; meaningful use metric preintervention increased from 12% to 16% after the intervention; 16% and 18% of patients viewed assigned videos in their health portal prior to procedure and after hospital discharge...
May 25, 2017: Computers, Informatics, Nursing: CIN
https://www.readbyqxmd.com/read/28541900/simultaneous-semi-coupled-dictionary-learning-for-matching-in-canonical-space
#15
Nilotpal Das, Devraj Mandal, Soma Biswas
Cross-modal recognition and matching with privileged information are important challenging problems in the field of computer vision. The cross-modal scenario deals with matching across different modalities and needs to take care of the large variations present across and within each modality. The privileged information scenario deals with the situation that all the information available during training may not be available during the testing stage and hence algorithms need to leverage the extra information from the training stage itself...
May 24, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28541896/solving-inaccuracies-in-anatomical-models-for-electrocardiographic-inverse-problem-resolution-by-maximizing-reconstruction-quality
#16
Miguel Rodrigo, Andreu Climent, Alejandro Liberos, Ismael Hernandez-Romero, Angel Arenal, Javier Bermejo, Francisco Fernandez-Aviles, Felipe Atienza, Maria Guillem
Electrocardiographic Imaging (ECGI) has become an increasingly used technique for non-invasive diagnosis of cardiac arrhythmias, although the need for medical imaging technology to determine the anatomy hinders its introduction in the clinical practice. This work explores the ability of a new metric based on the inverse reconstruction quality for the location and orientation of the atrial surface inside the torso. Body surface electrical signals from 31 realistic mathematical models and four AF patients were used to estimate the optimal position of the atria inside the torso...
May 23, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28541832/design-and-development-of-the-first-exoskeletal-garment-to-enhance-arm-mobility-for-children-with-movement-impairments
#17
Martha L Hall, Michele A Lobo
Children with a variety of diagnoses have impairments that limit their arm function. Despite the fact that arm function is important for early learning and activities of daily living, there are few tools to assist movement for these children, and existing devices have challenges related to cost, accessibility, comfort, and aesthetics. In this article, we describe the design process and development of the first garment-based exoskeleton to assist arm movement in young children with movement impairments: the Playskin Lift(TM)...
May 25, 2017: Assistive Technology: the Official Journal of RESNA
https://www.readbyqxmd.com/read/28541744/sample-size-for-comparing-negative-binomial-rates-in-noninferiority-and-equivalence-trials-with-unequal-follow-up-times
#18
Yongqiang Tang
We derive the sample size formulae for comparing two negative binomial rates based on both the relative and absolute rate difference metrics in noninferiority and equivalence trials with unequal follow-up times, and establish an approximate relationship between the sample sizes required for the treatment comparison based on the two treatment effect metrics. The proposed method allows the dispersion parameter to vary by treatment groups. The accuracy of these methods is assessed by simulations. It is demonstrated that ignoring the between-subject variation in the follow-up time by setting the follow-up time for all individuals to be the mean follow-up time may greatly underestimate the required size, resulting in underpowered studies...
May 25, 2017: Journal of Biopharmaceutical Statistics
https://www.readbyqxmd.com/read/28541670/metrics-to-evaluate-journals-scientists-and-science-we-are-not-there-yet
#19
Jonathan V Sweedler
No abstract text is available yet for this article.
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28541578/disrupted-development-and-integrity-of-frontal-white-matter-in-patients-treated-for-pediatric-medulloblastoma
#20
John O Glass, Robert J Ogg, Jung W Hyun, Julie H Harreld, Jane E Schreiber, Yimei Li, Amar J Gajjar, Wilburn E Reddick
Background.: Treatment of pediatric medulloblastoma is associated with known neurocognitive deficits that we hypothesize are caused by microstructural damage to frontal white matter (WM). Methods.: Longitudinal MRI examinations were collected from baseline (after surgery but before therapy) to 36 months in 146 patients and at 3 time points in 72 controls. Regional analyses of frontal WM volume and diffusion tensor imaging metrics were performed and verified with tract-based spatial statistics...
May 25, 2017: Neuro-oncology
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