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https://www.readbyqxmd.com/read/28532108/assessing-stiffness-of-nanofibres-in-bacterial-cellulose-hydrogels-numerical-experimental-framework
#1
Xing Gao, Emrah Sozumert, Zhijun Shi, Guang Yang, Vadim V Silberschmidt
This work presents a numerical-experimental framework for assessment of stiffness of nanofibres in a fibrous hydrogel - bacterial cellulose (BC) hydrogel - based on a combination of in-aqua mechanical testing, microstructural analysis and finite-element (FE) modelling. Fibrous hydrogels attracted growing interest as potential replacements to some tissues. To assess their applicability, a comprehensive understanding of their mechanical response under relevant conditions is desirable; a lack of such knowledge is mainly due to changes at microscale caused by deformation that are hard to evaluate in-situ because of the dimensions of nanofibres and aqueous environment...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531796/spatially-explicit-modeling-of-multi-scale-drivers-of-aboveground-forest-biomass-and-water-yield-in-watersheds-of-the-southeastern-united-states
#2
Mukhtar Ahmed Ajaz Ahmed, Amr Abd-Elrahman, Francisco J Escobedo, Wendell P Cropper, Timothy A Martin, Nilesh Timilsina
Understanding ecosystem processes and the influence of regional scale drivers can provide useful information for managing forest ecosystems. Examining more local scale drivers of forest biomass and water yield can also provide insights for identifying and better understanding the effects of climate change and management on forests. We used diverse multi-scale datasets, functional models and Geographically Weighted Regression (GWR) to model ecosystem processes at the watershed scale and to interpret the influence of ecological drivers across the Southeastern United States (SE US)...
May 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28531299/pain-energy-model-of-mobility-limitation-in-the-older-adult
#3
Peter C Coyle, Jennifer A Schrack, Gregory E Hicks
Background. : Chronic pain is prevalent, costly, and disabling among older adults. Although mobility decline is inevitable with aging, it is clear, from current evidence, that older adults with chronic pain experience a greater rate of functional mobility decline than their pain-free peers. Past studies suggest that pain expedites the age-related decline in functional mobility; however, the pathways through which pain affects mobility remain unclear. Gerontological experts hypothesize that the age-related decline in mobility may be driven by alterations in energy expenditure; these concepts are outlined in a model known as the Energetic Pathway of Mobility Loss...
May 22, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28531226/intercenter-validation-of-a-knowledge-based-model-for-automated-planning-of-volumetric-modulated-arc-therapy-for-prostate-cancer-the-experience-of-the-german-rapidplan-consortium
#4
Carolin Schubert, Oliver Waletzko, Christian Weiss, Dirk Voelzke, Sevda Toperim, Arnd Roeser, Silvia Puccini, Marc Piroth, Christian Mehrens, Jan-Dirk Kueter, Kirsten Hierholz, Karsten Gerull, Antonella Fogliata, Andreas Block, Luca Cozzi
PURPOSE: To evaluate the performance of a model-based optimisation process for volumetric modulated arc therapy applied to prostate cancer in a multicentric cooperative group. The RapidPlan (RP) knowledge-based engine was tested for the planning of Volumetric modulated arc therapy with RapidArc on prostate cancer patients. The study was conducted in the frame of the German RapidPlan Consortium (GRC). METHODS AND MATERIALS: 43 patients from one institute of the GRC were used to build and train a RP model...
2017: PloS One
https://www.readbyqxmd.com/read/28531171/no-relevant-association-of-kinematic-gait-parameters-with-health-related-quality-of-life-in-parkinson-s-disease
#5
Kristina Bettecken, Felix Bernhard, Jennifer Sartor, Markus A Hobert, Marc Hofmann, Till Gladow, Janet M T van Uem, Inga Liepelt-Scarfone, Walter Maetzler
BACKGROUND: Health-related Quality of Life (HrQoL) is probably the most important outcome parameter for the evaluation and management of chronic diseases. As this parameter is subjective and prone to bias, there is an urgent need to identify objective surrogate markers. Gait velocity has been shown to be associated with HrQoL in numerous chronic diseases, such as Parkinson's disease (PD). With the development and wide availability of simple-to-use wearable sensors and sophisticated gait algorithms, kinematic gait parameters may soon be implemented in clinical routine management...
2017: PloS One
https://www.readbyqxmd.com/read/28530474/optimising-pre-season-training-loads-in-australian-football
#6
David L Carey, Justin Crow, Kok-Leong Ong, Peter Blanch, Meg E Morris, Ben J Dascombe, Kay M Crossley
PURPOSE: To investigate whether pre-season training plans for Australian football can be computer generated using current training load guidelines to optimise injury risk reduction and performance improvement. METHODS: A constrained optimisation problem was defined for daily total and sprint distance, using the pre-season schedule of an elite Australian football team as a template. Maximising total training volume and maximising Banister model projected performance were both considered as optimisation objectives...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28530004/patch-based-discrete-registration-of-clinical-brain-images
#7
Adrian V Dalca, Andreea Bobu, Natalia S Rost, Polina Golland
We introduce a method for registration of brain images acquired in clinical settings. The algorithm relies on three-dimensional patches in a discrete registration framework to estimate correspondences. Clinical images present significant challenges for computational analysis. Fast acquisition often results in images with sparse slices, severe artifacts, and variable fields of view. Yet, large clinical datasets hold a wealth of clinically relevant information. Despite significant progress in image registration, most algorithms make strong assumptions about the continuity of image data, failing when presented with clinical images that violate these assumptions...
October 2016: Patch-Based Techniques in Medical Imaging: Second International Workshop, Patch-MI 2016, Held in Conjunction with MICCAI 2016, Athens, Greece, October 17, 2016, Proceedings. Patch-MI (Workshop) (2nd: 2016: Athens, Greece)
https://www.readbyqxmd.com/read/28529756/a-socioecological-framework-for-research-on-work-and-obesity-in-diverse-urban-transit-operators-based-on-gender-race-and-ethnicity
#8
REVIEW
BongKyoo Choi, Peter Schnall, Marnie Dobson, Haiou Yang, Dean Baker, YoungJu Seo
Urban transit (bus and rail) operators, totaling nearly 700,000 persons, are one of the heaviest occupational groups in the United States (US). Little is known about occupational risk factors for weight gain and obesity and their interrelationship with health-related behaviors, particularly among female minority (African Americans and Hispanics) transit operators who are at greater risk for obesity. As a step towards developing successful obesity interventions among urban transit operators, this paper aims to present a new socioecological framework for studying working conditions, chronic strain, health-related behaviors, weight gain/obesity, and obesity disparity in diverse urban transit operators based on gender, race, and ethnicity...
2017: Annals of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28529699/evolution-immunity-and-the-emergence-of-brain-superautoantigens
#9
Serge Nataf
While some autoimmune disorders remain extremely rare, others largely predominate the epidemiology of human autoimmunity. Notably, these include psoriasis, diabetes, vitiligo, thyroiditis, rheumatoid arthritis and multiple sclerosis. Thus, despite the quasi-infinite number of "self" antigens that could theoretically trigger autoimmune responses, only a limited set of antigens, referred here as superautoantigens, induce pathogenic adaptive responses. Several lines of evidence reviewed in this paper indicate that, irrespective of the targeted organ (e...
2017: F1000Research
https://www.readbyqxmd.com/read/28529491/decision-making-processes-in-the-workplace-how-exhaustion-lack-of-resources-and-job-demands-impair-them-and-affect-performance
#10
Andrea Ceschi, Evangelia Demerouti, Riccardo Sartori, Joshua Weller
The present study aims to connect more the I/O and the decision-making psychological domains, by showing how some common components across jobs interfere with decision-making and affecting performance. Two distinct constructs that can contribute to positive workplace performance have been considered: decision-making competency (DMCy) and decision environment management (DEM). Both factors are presumed to involve self-regulatory mechanisms connected to decision processes by influencing performance in relation to work environment conditions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28529445/regression-models-on-riemannian-symmetric-spaces
#11
Emil Cornea, Hongtu Zhu, Peter Kim, Joseph G Ibrahim
The aim of this paper is to develop a general regression framework for the analysis of manifold-valued response in a Riemannian symmetric space (RSS) and its association with multiple covariates of interest, such as age or gender, in Euclidean space. Such RSS-valued data arises frequently in medical imaging, surface modeling, and computer vision, among many others. We develop an intrinsic regression model solely based on an intrinsic conditional moment assumption, avoiding specifying any parametric distribution in RSS...
March 2017: Journal of the Royal Statistical Society. Series B, Statistical Methodology
https://www.readbyqxmd.com/read/28528939/aga-white-paper-training-and-implementation-of-endoscopic-image-enhancement-technologies
#12
Neil Gupta, Joel V Brill, Marcia Canto, Daniel DeMarco, Brian M Fennerty, Loren Laine, David Lieberman, Charles Lightdale, Elizabeth Montgomery, Robert Odze, Douglas Rex, Prateek Sharma, Jeffrey L Tokar, Michael L Kochman
Endoscopic image-enhancement technologies provide opportunities to visualize normal and abnormal tissues within the gastrointestinal (GI) tract in a manner that complements conventional white light endoscopic imaging. The additional information that is obtained enables the endoscopist to better identify, delineate, and characterize lesions and can facilitate targeted biopsies or, in some cases, eliminate the need to send samples for histologic analysis. Some of these technologies have been available for more than a decade, but despite this fact, there is limited use of these technologies by endoscopists...
June 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28528587/persistent-infections-support-maintenance-of-a-coronavirus-in-a-population-of-australian-bats-myotis-macropus
#13
J Jeong, C S Smith, A J Peel, R K Plowright, D H Kerlin, J McBroom, H McCallum
Understanding viral transmission dynamics within populations of reservoir hosts can facilitate greater knowledge of the spillover of emerging infectious diseases. While bat-borne viruses are of concern to public health, investigations into their dynamics have been limited by a lack of longitudinal data from individual bats. Here, we examine capture-mark-recapture (CMR) data from a species of Australian bat (Myotis macropus) infected with a putative novel Alphacoronavirus within a Bayesian framework. Then, we developed epidemic models to estimate the effect of persistently infectious individuals (which shed viruses for extensive periods) on the probability of viral maintenance within the study population...
May 22, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28528527/health-literacy-and-associated-factors-among-hmong-american-immigrants-addressing-the-health-disparities
#14
Belle P Khuu, Hee Y Lee, Anne Q Zhou
Hmong Americans face a disproportionate health burden ranging from the high prevalence of diabetes to depressive disorders. Little research attention has been paid toward exploring contributing factors to this disparity. As such, the present study seeks to fill the gap in the literature by examining the health literacy levels in Hmong Americans and its associated factors. The present study employed Andersen's behavioral model of health service as the theoretical framework. A cross-sectional survey research design was used and information was gathered from 168 Hmong American immigrants...
May 20, 2017: Journal of Community Health
https://www.readbyqxmd.com/read/28528007/luteolin-as-a-potential-preventive-and-therapeutic-candidate-for-alzheimer-s-disease
#15
Youngjoo Kwon
Amyloid cascade hypothesis is the main theoretical framework describing the development of Alzheimer's disease (AD). However, most clinical trials of therapy targeting amyloid-β peptide (Aβ) are unsuccessful because AD is a complex disease involving many genetic and environmental factors. Among various factors, inflammation within the brain in particular has been implicated in the pathogenesis and progression of AD. Furthermore, it has been shown that systemic inflammation can initiate AD. Therefore, anti-inflammatory agents might be beneficial for prevention and/or treatment of AD...
May 17, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28527644/conceptual-structure-of-health-related-quality-of-life-for-persons-with-traumatic-brain-injury-confirmatory-factor-analysis-of-the-tbi-qol
#16
Mark Sherer, Julia Maria Paul Poritz, David Tulsky, Pamela Kisala, Luis Leon-Novelo, Esther Ngan
OBJECTIVE: To determine the factor structure of the Traumatic Brain Injury - Quality of Life (TBI-QOL) measurement system. DESIGN: Observational. SETTING: 3 TBI Model Systems rehabilitation centers in the US PARTICIPANTS: and Methods: 20 TBI-QOL item banks were administered to a sample of 504 community-dwelling adults with traumatic brain injury (TBI) as part of a study of TBI classification. A subsample of n=200 participants was randomly selected for exploratory factor analyses (EFA), while data from the remaining 304 participants were used for the confirmatory factor analysis (CFA)...
May 17, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28527568/evolution-of-nuclear-receptors-and-ligand-signaling-toward-a-soft-key-lock-model
#17
Guillaume Holzer, Gabriel V Markov, Vincent Laudet
Nuclear receptors (NRs) are a family of ligand-regulated transcription factors that modulate a wide variety of physiological functions in a ligand-dependent manner. The first NRs were discovered as receptors of well-known hormones such as 17β-estradiol, corticosteroids, or thyroid hormones. In these cases a direct activation of the receptor transcriptional activity by a very specific ligand, with nanomolar affinity, was demonstrated, providing a strong conceptual framework to understand the mechanism of action of these hormones...
2017: Current Topics in Developmental Biology
https://www.readbyqxmd.com/read/28527179/making-time-conservation-of-biological-clocks-from-fungi-to-animals
#18
Jay C Dunlap, Jennifer J Loros
The capacity for biological timekeeping arose at least three times through evolution, in prokaryotic cyanobacteria, in cells that evolved into higher plants, and within the group of organisms that eventually became the fungi and the animals. Neurospora is a tractable model system for understanding the molecular bases of circadian rhythms in the last of these groups, and is perhaps the most intensively studied circadian cell type. Rhythmic processes described in fungi include growth rate, stress responses, developmental capacity, and sporulation, as well as much of metabolism; fungi use clocks to anticipate daily environmental changes...
May 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28527018/predicting-academic-impairment-and-internalizing-psychopathology-using-a-multidimensional-framework-of-sluggish-cognitive-tempo-with-parent-and-adolescent-reports
#19
Zoe R Smith, Joshua M Langberg
Adolescents with Sluggish Cognitive Tempo (SCT) exhibit symptoms of slowness, mental confusion, excessive daydreaming, low motivation, and drowsiness/sleepiness. Although many symptoms of SCT reflect internalizing states, no study has evaluated the clinical utility of self-report of SCT in an attention-deficit/hyperactivity disorder (ADHD) sample. Furthermore, it remains unclear whether SCT is best conceptualized as a unidimensional or multidimensional construct. In a sample of 262 adolescents comprehensively diagnosed with ADHD, the present study used adolescent- and parent reports of SCT to evaluate the predictive utility of a general SCT factor from a bifactor modeling approach compared the utility of three specific SCT factors (slow, sleepy, and daydreamer) for predicting academic impairment and internalizing psychopathology...
May 19, 2017: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/28526918/effect-of-problem-and-scripting-based-learning-on-spine-surgical-trainees-learning-outcomes
#20
Lin Cong, Qi Yan, Chenjing Sun, Yue Zhu, Guanjun Tu
PURPOSE: To assess the impact of problem and scripting-based learning (PSBL) on spine surgical trainees' learning outcomes. METHODS: 30 spine surgery postgraduate-year-1 residents (PGY-1s) from the First Hospital of China Medical University were randomly divided into two groups. The first group studied spine surgical skills and developed individual judgment under a conventional didactic model, whereas the PSBL group used PBL and Scripted model. A feedback questionnaire and the satisfaction of residents were evaluated by the first assistant surgeon immediately following each procedure...
May 19, 2017: European Spine Journal
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