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https://www.readbyqxmd.com/read/29334237/safety-of-working-patterns-among-uk-neuroradiologists-what-can-we-learn-from-the-aviation-industry-and-cognitive-science
#1
John Reicher, Stuart Currie, Daniel Birchall
As the volume and complexity of imaging in the UK continues to rise, there is pressure on radiologists to spend increasing lengths of time reporting to cope with the growing workload. However, there is limited guidance for radiologists about structuring the working day to achieve the necessary balance between satisfactory reporting volume and maintaining quality and safety. We surveyed 86 Neuroradiologists (receiving 59 responses), regarding time spent reporting, frequency and duration of work breaks, and break activities...
January 15, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29331137/molecular-dynamics-based-enhanced-sampling-of-collective-variables-with-very-large-time-steps
#2
Pei-Yang Chen, Mark E Tuckerman
Enhanced sampling techniques that target a set of collective variables and that use molecular dynamics as the driving engine have seen widespread application in the computational molecular sciences as a means to explore the free-energy landscapes of complex systems. The use of molecular dynamics as the fundamental driver of the sampling requires the introduction of a time step whose magnitude is limited by the fastest motions in a system. While standard multiple time-stepping methods allow larger time steps to be employed for the slower and computationally more expensive forces, the maximum achievable increase in time step is limited by resonance phenomena, which inextricably couple fast and slow motions...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29331129/perspective-structural-fluctuation-of-protein-and-anfinsen-s-thermodynamic-hypothesis
#3
Fumio Hirata, Masatake Sugita, Masasuke Yoshida, Kazuyuki Akasaka
The thermodynamics hypothesis, casually referred to as "Anfinsen's dogma," is described theoretically in terms of a concept of the structural fluctuation of protein or the first moment (average structure) and the second moment (variance and covariance) of the structural distribution. The new theoretical concept views the unfolding and refolding processes of protein as a shift of the structural distribution induced by a thermodynamic perturbation, with the variance-covariance matrix varying. Based on the theoretical concept, a method to characterize the mechanism of folding (or unfolding) is proposed...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29330987/pattern-of-dyslipidaemia-and-its-association-with-hypovitaminosis-d-in-type-2-diabetes-mellitus
#4
Farhat Bashir, Zia Ullah Khan, Naresh Kumar Seetlani, Zaman Sheikh
BACKGROUND: Macrovascular atherosclerosis is an important long-term complication of type 2 diabetes mellitus. Concurrent dyslipidaemia acts as an additional risk factor for these complications. Hypovitaminosis D has been associated with adverse cardiovascular events. These modifiable risk factors of cardiovascular disease are inter-related. In the presence of an increasing incidence of type 2 diabetes mellitus and its associated metabolic abnormalities and widespread vitamin D deficiency in Pakistan, this association needs to be investigated...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29329978/data-quality-over-data-quantity-in-computational-cognitive-neuroscience
#5
Antonio Kolossa, Bruno Kopp
We analyzed factors that may hamper the advancement of computational cognitive neuroscience (CCN). These factors include a particular statistical mindset, which paves the way for the dominance of statistical power theory and a preoccupation with statistical replicability in the behavioral and neural sciences. Exclusive statistical concerns about sampling error occur at the cost of an inadequate representation of the problem of measurement error. We contrasted the manipulation of data quantity (sampling error, by varying the number of subjects) against the manipulation of data quality (measurement error, by varying the number of data per subject) in a simulated Bayesian model identifiability study...
January 9, 2018: NeuroImage
https://www.readbyqxmd.com/read/29328139/holographic-display-methods-for-volume-data-polygon-based-and-mip-based-methods
#6
Zixiang Lu, Yuji Sakamoto
Volume data are widely used in many areas, especially in biomedical science and geology. However, current visualization technologies of volume data cannot satisfy the visual requirements of humans. In this study, we propose two holographic display methods for volume data. The first method is polygon-based, and the other is maximum intensity projection (MIP)-based. Both methods are able to generate computer generated holograms of volume data. The polygon-based method can obtain various and colorful holograms, while the MIP-based method can be quickly calculated...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328057/electron-phonon-coupling-from-finite-differences
#7
Bartomeu Monserrat
The interaction between electrons and phonons underlies multiple phenomena in physics, chemistry, and materials science. Examples include superconductivity, electronic transport, and the temperature dependence of optical spectra. A first-principles description of electron-phonon coupling enables the study of the above phenomena with accuracy and material specificity, which can be used to understand experiments and to predict novel effects and functionality. In this topical review, we describe the first-principles calculation of electron-phonon coupling from finite differences...
January 12, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29327916/self-assembly-of-pseudorotaxane-structures-from-a-dicopper-ii-molecular-cage-and-dicarboxylate-axles
#8
Valeria Amendola, Ana Miljkovic, Laura Legnani, Lucio Toma, Daniele Dondi, Simone Lazzaroni
In this work, we employed for the first time a dinuclear bis[tris(2-aminoethyl)amine] cryptate to obtain the self-assembly of pseudorotaxane structures in an aqueous solution. The goal was achieved by exploiting the well-known affinity of the dicopper azacryptate with diphenyl spacers for the terephthalate anion. In particular, a series of molecular threads were synthesized by appending either alkyl or polyoxyethylene chains on both sides of the terephthalate benzene ring. The obtained dicarboxylic acids were precipitated as sodium salts, and their affinity toward the dicopper azacryptate was determined in a methanol/water mixture (pH 7)...
January 12, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29324777/assessing-an-effective-undergraduate-module-teaching-applied-bioinformatics-to-biology-students
#9
Andreas Madlung
Applied bioinformatics skills are becoming ever more indispensable for biologists, yet incorporation of these skills into the undergraduate biology curriculum is lagging behind, in part due to a lack of instructors willing and able to teach basic bioinformatics in classes that don't specifically focus on quantitative skill development, such as statistics or computer sciences. To help undergraduate course instructors who themselves did not learn bioinformatics as part of their own education and are hesitant to plunge into teaching big data analysis, a module was developed that is written in plain-enough language, using publicly available computing tools and data, to allow novice instructors to teach next-generation sequence analysis to upper-level undergraduate students...
January 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29324560/contrast-media-extravasations-in-patients-undergoing-computerized-tomography-scanning-a-systematic-review-and-meta-analysis-of-risk-factors-and-interventions
#10
Sandrine Ding, Nicole Richli Meystre, Cosmin Campeanu, Giuseppe Gullo
OBJECTIVE: To identify risk factors and interventions preventing or reducing contrast medium extravasation. INTRODUCTION: Computed tomography (CT) is a radiological examination essential for the diagnosis and monitoring of many diseases. It is often performed with the intravenous (IV) injection of contrast agents. Use of these products can result in a significant complication, extravasation, which is the accidental leakage of IV material into the surrounding tissue...
January 2018: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/29324362/x-ray-system-simulation-software-tools-for-radiology-and-radiography-education
#11
Stephen M Kengyelics, Laura A Treadgold, Andrew G Davies
OBJECTIVES: To develop x-ray simulation software tools to support delivery of radiological science education for a range of learning environments and audiences including individual study, lectures, and tutorials. METHODS: Two software tools were developed; one simulated x-ray production for a simple two dimensional radiographic system geometry comprising an x-ray source, beam filter, test object and detector. The other simulated the acquisition and display of two dimensional radiographic images of complex three dimensional objects using a ray casting algorithm through three dimensional mesh objects...
December 13, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29324240/cognitive-science-in-the-era-of-artificial-intelligence-a-roadmap-for-reverse-engineering-the-infant-language-learner
#12
Emmanuel Dupoux
Spectacular progress in the information processing sciences (machine learning, wearable sensors) promises to revolutionize the study of cognitive development. Here, we analyse the conditions under which 'reverse engineering' language development, i.e., building an effective system that mimics infant's achievements, can contribute to our scientific understanding of early language development. We argue that, on the computational side, it is important to move from toy problems to the full complexity of the learning situation, and take as input as faithful reconstructions of the sensory signals available to infants as possible...
January 8, 2018: Cognition
https://www.readbyqxmd.com/read/29322101/a-novel-individual-level-morphological-brain-networks-constructing-method-and-its-evaluation-in-pet-and-mr-images
#13
Jiehui Jiang, Hucheng Zhou, Huoqiang Duan, Xin Liu, Chuantao Zuo, Zhemin Huang, Zhihua Yu, Zhuangzhi Yan
Mapping the human brain is one of the great scientific challenges of the 21st century. Brain network analysis is an effective technique based on graph theory that is widely used to investigate network patterns in the human brain. Currently, mapping an individual brain network using a single image has been a hotspot in the field of brain science; techniques, such as the Kullback-Leibler (KL) method, have applications in structural Magnetic Resonance (MR) imaging. However, maintaining an image's intensity, shape, texture and gradient information during feature extraction is very challenging...
December 2017: Heliyon
https://www.readbyqxmd.com/read/29321471/author-correction-signatures-of-the-topological-s-superconducting-order-parameter-in-the-type-ii-weyl-semimetal-t-d-mote2
#14
Z Guguchia, F von Rohr, Z Shermadini, A T Lee, S Banerjee, A R Wieteska, C A Marianetti, B A Frandsen, H Luetkens, Z Gong, S C Cheung, C Baines, A Shengelaya, G Taniashvili, A N Pasupathy, E Morenzoni, S J L Billinge, A Amato, R J Cava, R Khasanov, Y J Uemura
The original version of this article omitted the following from the Acknowledgements: "CAM and AL were supported by the NSF MRSEC program through Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids (DMR-1420634). Additionally, this research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under 'Contract No. DE-AC02-05CH11231'." This has now been corrected in both the PDF and HTML versions of the article...
January 10, 2018: Nature Communications
https://www.readbyqxmd.com/read/29320509/dynamics-of-co-authorship-and-productivity-across-different-fields-of-scientific-research
#15
Austin J Parish, Kevin W Boyack, John P A Ioannidis
We aimed to assess which factors correlate with collaborative behavior and whether such behavior associates with scientific impact (citations and becoming a principal investigator). We used the R index which is defined for each author as log(Np)/log(I1), where I1 is the number of co-authors who appear in at least I1 papers written by that author and Np are his/her total papers. Higher R means lower collaborative behavior, i.e. not working much with others, or not collaborating repeatedly with the same co-authors...
2018: PloS One
https://www.readbyqxmd.com/read/29319610/the-effectiveness-of-online-pain-resources-for-health-professionals-a-systematic-review-with-subset-meta-analysis-of-educational-intervention-studies
#16
Christina Liossi DPsych, Alessandro Failo PhD, Daniel E Schoth PhD, Glyn Williams Md, Richard Howard Md
Online educational interventions are increasingly developed for health professionals and students, although graduate and undergraduate medical curricular often contain limited information about how to assess and manage pain. This study reviews the literature on the effectiveness of pain-related online educational resources. Studies were identified via a search of Medline, PsychINFO, Web of Science, CINAHL, PubMed, Scopus, Cochrane Library, Google Scholar and OpenGrey databases. Search terms included three concept blocks: (i) type of intervention - online education, computer-based, e-learning, web-based, and internet-based; (ii) population - pediatrician, physician, nurse, psychologist, medical; (iii) outcome - pain*...
January 9, 2018: Pain
https://www.readbyqxmd.com/read/29316968/improving-the-interoperability-of-biomedical-ontologies-with-compound-alignments
#17
Daniela Oliveira, Catia Pesquita
BACKGROUND: Ontologies are commonly used to annotate and help process life sciences data. Although their original goal is to facilitate integration and interoperability among heterogeneous data sources, when these sources are annotated with distinct ontologies, bridging this gap can be challenging. In the last decade, ontology matching systems have been evolving and are now capable of producing high-quality mappings for life sciences ontologies, usually limited to the equivalence between two ontologies...
January 9, 2018: Journal of Biomedical Semantics
https://www.readbyqxmd.com/read/29314842/exploration-versus-exploitation-in-global-atomistic-structure-optimization
#18
Mathias Siggaard Jørgensen, Uffe Furlig Larsen, Karsten W Jacobsen, Bjørk Hammer
The ability to navigate vast energy landscapes of molecules, clusters, and solids is a necessity for discovering novel compounds in computational chemistry and materials science. For high-dimensional systems it is only computationally feasibly to search a small portion of the landscape, and hence the search strategy is of critical importance. Introducing Bayesian optimization concepts in an evolutionary algorithm framework, we quantify the concepts of exploration and exploitation in global minimum searches...
January 9, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29314649/approaching-the-thermodynamic-view-of-protein-folding-through-the-reproduction-of-anfinsen-s-experiment-by-undergraduate-physical-biochemistry-students
#19
Andres Fernandez-Reche, Eva S Cobos, Irene Luque, Javier Ruiz-Sanz, Jose C Martinez
In 1972 Christian B. Anfinsen received the Nobel Prize in Chemistry for "…his work on ribonuclease, especially concerning the connection between the amino acid sequence and the biologically active conformation." The understanding of this principle is crucial for physical biochemistry students, since protein folding studies, bio-computing sciences and protein design approaches are founded on such a well-demonstrated connection. Herein, we describe a detailed and easy-to-follow experiment to reproduce the most relevant assays carried out at Anfinsen's laboratory in the 60s...
January 4, 2018: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/29312703/isolated-unilateral-absence-of-pulmonary-artery-in-adulthood-a-clinical-analysis-of-65-cases-from-a-case-series-and-systematic-review
#20
Ping Wang, Ling Yuan, Juhong Shi, Zuojun Xu
Background: Isolated unilateral absence of pulmonary artery (UAPA) in adulthood is a rare congenital anomaly. Although some case reports exist, the clinical symptomatology, lung parenchymal features, collateral circulation and therapeutic approaches in adult patients with isolated UAPA remain unknown. The objectives of this study are to investigate the clinical characteristics, elucidate the correlation between clinical symptomatology and radiology, and summarize treatment of adult patients with isolated UAPA...
December 2017: Journal of Thoracic Disease
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