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https://www.readbyqxmd.com/read/27910162/effects-of-sample-size-and-distributional-assumptions-on-competing-models-of-the-factor-structure-of-the-panss-and-bprs
#1
Stephen J Tueller, Kiersten L Johnson, Kevin J Grimm, Sarah L Desmarais, Brian G Sellers, Richard A Van Dorn
Factor analytic work on the Positive and Negative Syndrome Scale (PANSS) and Brief Psychiatric Rating Scale (BPRS) has yielded varied and conflicting results. The current study explored potential causes of these discrepancies. Prior research has been limited by small sample sizes and an incorrect assumption that the items are normally distributed when in practice responses are highly skewed ordinal variables. Using simulation methodology, we examined the effects of sample size, (in)correctly specifying item distributions, collapsing rarely endorsed response categories, and four factor analytic models...
December 2, 2016: International Journal of Methods in Psychiatric Research
https://www.readbyqxmd.com/read/27908072/perceptual-attributes-for-the-comparison-of-head-related-transfer-functions
#2
Laurent S R Simon, Nick Zacharov, Brian F G Katz
The benefit of using individual head-related transfer functions (HRTFs) in binaural audio is well documented with regards to improving localization precision. However, with the increased use of binaural audio in more complex scene renderings, cognitive studies, and virtual and augmented reality simulations, the perceptual impact of HRTF selection may go beyond simple localization. In this study, the authors develop a list of attributes which qualify the perceived differences between HRTFs, providing a qualitative understanding of the perceptual variance of non-individual binaural renderings...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27906468/optimal-timing-of-hepatitis-c-treatment-for-patients-on-the-liver-transplant-waiting-list
#3
Jagpreet Chhatwal, Sumeyye Samur, Brian Kues, Turgay Ayer, Mark S Roberts, Fasiha Kanwal, Chin Hur, Drew Michael S Donnell, Raymond T Chung
: The availability of oral direct-acting antiviral (DAAs) has altered the hepatitis C virus (HCV) treatment paradigm for both pre- and post-liver transplant (LT) patients. There is a perceived trade-off between pre- versus post-LT treatment of HCV-treatment may improve liver function but potentially decrease the likelihood of a necessary LT. Our objective was to identify LT-eligible patients with decompensated cirrhosis who would benefit (and not benefit) from pre-LT treatment based on their MELD scores...
November 5, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/27900953/feedback-control-policies-employed-by-people-using-intracortical-brain-computer-interfaces
#4
Francis R Willett, Chethan Pandarinath, Beata Jarosiewicz, Brian A Murphy, William D Memberg, Christine H Blabe, Jad Saab, Benjamin L Walter, Jennifer A Sweet, Jonathan P Miller, Jaimie M Henderson, Krishna V Shenoy, John D Simeral, Leigh R Hochberg, Robert F Kirsch, A Bolu Ajiboye
OBJECTIVE: When using an intracortical BCI (iBCI), users modulate their neural population activity to move an effector towards a target, stop accurately, and correct for movement errors. We call the rules that govern this modulation a 'feedback control policy'. A better understanding of these policies may inform the design of higher-performing neural decoders. APPROACH: We studied how three participants in the BrainGate2 pilot clinical trial used an iBCI to control a cursor in a 2D target acquisition task...
November 30, 2016: Journal of Neural Engineering
https://www.readbyqxmd.com/read/27895542/effect-of-tart-cherry-juice-on-recovery-and-next-day-performance-in-well-trained-water-polo-players
#5
Rachel McCormick, Peter Peeling, Martyn Binnie, Brian Dawson, Marc Sim
BACKGROUND: Tart Montmorency cherries contain high concentrations of phytochemicals and anthocyanins, which have recently been linked to improved athletic recovery and subsequent performance. To date however, previous work reporting promising results has focused on land-based endurance sports, with any potential benefits to team sports remaining unknown. As such, this investigation set-out to examine the effect of supplemental tart cherry juice (CJ) on recovery and next day athletic performance in highly-trained water-based team sport athletes over seven days...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27893791/toward-a-nonspeech-test-of-auditory-cognition-semantic-context-effects-in-environmental-sound-identification-in-adults-of-varying-age-and-hearing-abilities
#6
Valeriy Shafiro, Stanley Sheft, Molly Norris, George Spanos, Katherine Radasevich, Paige Formsma, Brian Gygi
OBJECTIVE: Sounds in everyday environments tend to follow one another as events unfold over time. The tacit knowledge of contextual relationships among environmental sounds can influence their perception. We examined the effect of semantic context on the identification of sequences of environmental sounds by adults of varying age and hearing abilities, with an aim to develop a nonspeech test of auditory cognition. METHOD: The familiar environmental sound test (FEST) consisted of 25 individual sounds arranged into ten five-sound sequences: five contextually coherent and five incoherent...
2016: PloS One
https://www.readbyqxmd.com/read/27893768/macromolecular-crowding-regulates-the-gene-expression-profile-by-limiting-diffusion
#7
Mahdi Golkaram, Stefan Hellander, Brian Drawert, Linda R Petzold
We seek to elucidate the role of macromolecular crowding in transcription and translation. It is well known that stochasticity in gene expression can lead to differential gene expression and heterogeneity in a cell population. Recent experimental observations by Tan et al. have improved our understanding of the functional role of macromolecular crowding. It can be inferred from their observations that macromolecular crowding can lead to robustness in gene expression, resulting in a more homogeneous cell population...
November 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27893348/cost-utility-and-budget-impact-of-methylene-blue-treated-plasma-compared-to-quarantine-plasma
#8
Joseph B Babigumira, Solomon J Lubinga, Emma Castro, Brian Custer
BACKGROUND: Methylene blue and visible light treatment and quarantine are two methods used to reduce adverse events, mostly infections, associated with the transfusion of fresh-frozen plasma. The objective of this study was to estimate and compare the budget impact and cost-utility of these two methods from a payer's perspective. MATERIALS AND METHODS: A budget impact and cost-utility model simulating the risks of hepatitis B virus, hepatitis C virus, cytomegalovirus, a West Nile virus-like infection, allergic reactions and febrile non-haemolytic transfusion reactions achieved using plasma treated with methylene blue and visible light (MBP) and quarantine plasma (QP) was constructed for Spain...
November 16, 2016: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/27885821/exploring-simulation-in-the-internal-medicine-clerkship
#9
Brian Kwan, Glory Bui, Paul Jain, Nilesh Shah, Derek Juang
BACKGROUND: Simulation-based medical education has been shown to produce substantial educational benefits; however, the integration and effectiveness of high-fidelity simulation within the internal medicine (IM) clerkship remains largely unexplored. Investigators sought to determine the effectiveness of simulation in improving student confidence in acute coronary syndrome (ACS) and the Advanced Cardiac Life Support (ACLS) curriculum. Secondary goals included examining student perceptions of the role of simulation in medical education...
November 25, 2016: Clinical Teacher
https://www.readbyqxmd.com/read/27881302/crystal-structure-of-a-full-length-human-tetraspanin-reveals-a-cholesterol-binding-pocket
#10
Brandon Zimmerman, Brendan Kelly, Brian J McMillan, Tom C M Seegar, Ron O Dror, Andrew C Kruse, Stephen C Blacklow
Tetraspanins comprise a diverse family of four-pass transmembrane proteins that play critical roles in the immune, reproductive, genitourinary, and auditory systems. Despite their pervasive roles in human physiology, little is known about the structure of tetraspanins or the molecular mechanisms underlying their various functions. Here, we report the crystal structure of human CD81, a full-length tetraspanin. The transmembrane segments of CD81 pack as two largely separated pairs of helices, capped by the large extracellular loop (EC2) at the outer membrane leaflet...
November 3, 2016: Cell
https://www.readbyqxmd.com/read/27878205/iterative-development-and-evaluation-of-a-pharmacogenomic-guided-clinical-decision-support-system-for-warfarin-dosing
#11
Brittany L Melton, Alan J Zillich, Jason Saleem, Alissa L Russ, James E Tisdale, Brian R Overholser
OBJECTIVE: Pharmacogenomic-guided dosing has the potential to improve patient outcomes but its implementation has been met with clinical challenges. Our objective was to develop and evaluate a clinical decision support system (CDSS) for pharmacogenomic-guided warfarin dosing designed for physicians and pharmacists. METHODS: Twelve physicians and pharmacists completed 6 prescribing tasks using simulated patient scenarios in two iterations (development and validation phases) of a newly developed pharmacogenomic-driven CDSS prototype...
November 23, 2016: Applied Clinical Informatics
https://www.readbyqxmd.com/read/27876163/process-control-charts-in-infection-prevention-make-it-simple-to-make-it-happen
#12
Timothy L Wiemken, Stephen P Furmanek, Ruth M Carrico, William A Mattingly, Annuradha K Persaud, Brian E Guinn, Robert R Kelley, Julio A Ramirez
BACKGROUND: Quality improvement is central to Infection Prevention and Control (IPC) programs. Challenges may occur when applying quality improvement methodologies like process control charts, often due to the limited exposure of typical IPs. Because of this, our team created an open-source database with a process control chart generator for IPC programs. The objectives of this report are to outline the development of the application and demonstrate application using simulated data. METHODS: We used Research Electronic Data Capture (REDCap Consortium, Vanderbilt University, Nashville, TN), R (R Foundation for Statistical Computing, Vienna, Austria), and R Studio Shiny (R Foundation for Statistical Computing) to create an open source data collection system with automated process control chart generation...
November 18, 2016: American Journal of Infection Control
https://www.readbyqxmd.com/read/27875310/extending-halogen-based-medicinal-chemistry-to-proteins-iodo-insulin-as-a-case-study
#13
Krystel El Hage, Vijay Pandyarajan, Nelson B Phillips, Brian J Smith, John G Menting, Jonathan Whittaker, Michael C Lawrence, Markus Meuwly, Michael A Weiss
Insulin, a protein critical for metabolic homeostasis, provides a classical model for protein design with application to human health. Recent efforts to improve its pharmaceutical formulation demonstrated that iodination of a conserved tyrosine (Tyr(B26)) enhances key properties of a rapid-acting clinical analog. Moreover, the broad utility of halogens in medicinal chemistry has motivated use of hybrid quantum- and molecular-mechanical methods to study proteins. Here, we (i) undertook quantitative atomic-level simulations of 3-I-Tyr(B26)-insulin to predict its structural features and (ii) tested these predictions by X-ray crystallography...
November 14, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27874210/cost-effectiveness-of-using-cognitive-screening-tests-for-detecting-dementia-and-mild-cognitive-impairment-in-primary-care
#14
Thaison Tong, Praveen Thokala, Brian McMillan, Rob Ghosh, John Brazier
INTRODUCTION: We estimated the cost effectiveness of different cognitive screening tests for use by General Practitioners (GPs) to detect cognitive impairment in England. METHODS: A patient-level cost-effectiveness model was developed using a simulated cohort that represents the elderly population in England (65 years and older). Each patient was followed over a lifetime period. Data from published sources were used to populate the model. The costs include government funded health and social care, private social care and informal care...
November 22, 2016: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/27872211/accurate-structure-prediction-of-cdr-h3-loops-enabled-by-a-novel-structure-based-c-terminal-constraint
#15
Brian D Weitzner, Jeffrey J Gray
Ab structure prediction has made great strides, but accurately modeling CDR H3 loops remains elusive. Unlike the other five CDR loops, CDR H3 does not adopt canonical conformations and must be modeled de novo. During Antibody Modeling Assessment II, we found that biasing simulations toward kinked conformations enables generating low-root mean square deviation models (Weitzner et al. 2014. Proteins 82: 1611-1623), and since then, we have presented new geometric parameters defining the kink conformation (Weitzner et al...
November 21, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27864922/estimates-of-local-biodiversity-change-over-time-stand-up-to-scrutiny
#16
Mark Vellend, Maria Dornelas, Lander Baeten, Robin Beauséjour, Carissa D Brown, Pieter De Frenne, Sarah C Elmendorf, Nicholas J Gotelli, Faye Moyes, Isla H Myers-Smith, Anne E Magurran, Brian J McGill, Hideyasu Shimadzu, Caya Sievers
We present new data and analyses revealing fundamental flaws in a critique of two recent meta-analyses of local-scale temporal biodiversity change. First, the conclusion that short-term time series lead to biased estimates of long-term change was based on two errors in the simulations used to support it. Second, the conclusion of negative relationships between temporal biodiversity change and study duration was entirely dependent on unrealistic model assumptions, the use of a subset of data, and inclusion of one outlier data point in one study...
November 19, 2016: Ecology
https://www.readbyqxmd.com/read/27859549/on-the-accurate-analysis-of-vibroacoustics-in-head-insert-gradient-coils
#17
Simone A Winkler, Andrew Alejski, Trevor Wade, Charles A McKenzie, Brian K Rutt
PURPOSE: To accurately analyze vibroacoustics in MR head gradient coils. THEORY AND METHODS: A detailed theoretical model for gradient coil vibroacoustics, including the first description and modeling of Lorentz damping, is introduced and implemented in a multiphysics software package. Numerical finite-element method simulations were used to establish a highly accurate vibroacoustic model in head gradient coils in detail, including the newly introduced Lorentz damping effect...
November 17, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27859126/unifying-error-structures-in-commonly-used-biotracer-mixing-models
#18
Brian C Stock, Brice X Semmens
Mixing models are statistical tools that use biotracers to probabilistically estimate the contribution of multiple sources to a mixture. These biotracers may include contaminants, fatty acids, or stable isotopes, the latter of which are widely used in trophic ecology to estimate the mixed diet of consumers. Bayesian implementations of mixing models using stable isotopes (e.g., MixSIR, SIAR) are regularly used by ecologists for this purpose, but basic questions remain about when each is most appropriate. In this study, we describe the structural differences between common mixing model error formulations in terms of their assumptions about the predation process...
October 2016: Ecology
https://www.readbyqxmd.com/read/27846706/a-framework-for-discrete-stochastic-simulation-on-3d-moving-boundary-domains
#19
Brian Drawert, Stefan Hellander, Michael Trogdon, Tau-Mu Yi, Linda Petzold
We have developed a method for modeling spatial stochastic biochemical reactions in complex, three-dimensional, and time-dependent domains using the reaction-diffusion master equation formalism. In particular, we look to address the fully coupled problems that arise in systems biology where the shape and mechanical properties of a cell are determined by the state of the biochemistry and vice versa. To validate our method and characterize the error involved, we compare our results for a carefully constructed test problem to those of a microscale implementation...
November 14, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27842603/simulated-partners-and-collaborative-exercise-space-to-boost-motivation-for-astronauts-study-protocol
#20
Deborah L Feltz, Lori Ploutz-Snyder, Brian Winn, Norbert L Kerr, James M Pivarnik, Alison Ede, Christopher Hill, Stephen Samendinger, William Jeffery
BACKGROUND: Astronauts may have difficulty adhering to exercise regimens at vigorous intensity levels during long space missions. Vigorous exercise is important for aerobic and musculoskeletal health during space missions and afterwards. A key impediment to maintaining vigorous exercise is motivation. Finding ways to motivate astronauts to exercise at levels necessary to mitigate reductions in musculoskeletal health and aerobic capacity have not been explored. The focus of Simulated Partners and Collaborative Exercise (SPACE) is to use recently documented motivation gains in task groups to heighten the exercise experience for participants, similar in age and fitness to astronauts, for vigorous exercise over a 6-month exercise regimen...
November 14, 2016: BMC Psychology
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