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distributed, massed, practice

Erdem Varol, Aristeidis Sotiras, Christos Davatzikos
Statistical parametric maps formed via voxel-wise mass-univariate tests, such as the general linear model, are commonly used to test hypotheses about regionally specific effects in neuroimaging cross-sectional studies where each subject is represented by a single image. Despite being informative, these techniques remain limited as they ignore multivariate relationships in the data. Most importantly, the commonly employed local Gaussian smoothing, which is important for accounting for registration errors and making the data follow Gaussian distributions, is usually chosen in an ad hoc fashion...
March 7, 2018: NeuroImage
Chuan Wei Duan, Lin Xu
BACKGROUND: Most of the androgen replacement therapies were based on serum testosterone and without measurements of total androgen activities. Whether those with low testosterone also have low levels of androgen activity is largely unknown. We hence examined the association between testosterone and androstanediol glucuronide (AG), a reliable measure of androgen activity, in a nationally representative sample of US men. METHODS: Cross-sectional analysis was based on 1493 men from the Third National Health and Nutrition examination Survey (NHANES III) conducted from 1988 to 1991...
March 9, 2018: BMC Public Health
Adissu Alemayehu Asfaw, Kris Wolfs, Ann Van Schepdael, Erwin Adams
Traditional headspace - gas chromatography (HS-GC) methods for the determination of residual solvents (RS) start from a homogenous sample solution. Subsequently, it is challenging to determine RS using HS-GC techniques from insoluble solid samples like gelatin which is practically impossible to dissolve or distribute uniformly in water and common organic solvents. In this study, a thermal desorber combined with capillary gas chromatography and flame ionization detection/mass spectrometry (TD-GC-FID/MS) was used for quantitative determination of residual dimethylsulfoxide (DMSO) in gelatin without sample pretreatment...
February 23, 2018: Journal of Pharmaceutical and Biomedical Analysis
Eric F May, Vincent W Lim, Peter J Metaxas, Jianwei Du, Paul L Stanwix, Darren Rowland, Michael L Johns, Gert Haandrikman, Daniel Crosby, Zachary M Aman
Gas hydrate formation is a stochastic phenomenon of considerable significance for any risk-based approach to flow assurance in the oil and gas industry. In principle, well-established results from nucleation theory offer the prospect of predictive models for hydrate formation probability in industrial production systems. In practice, however, heuristics are relied on when estimating formation risk for a given flowline subcooling or when quantifying kinetic hydrate inhibitor (KHI) performance. Here, we present statistically significant measurements of formation probability distributions for natural gas hydrate systems under shear, which are quantitatively compared with theoretical predictions...
February 27, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jui Fang, Zhuhuang Zhou, Ning-Fang Chang, Yung-Liang Wan, Po-Hsiang Tsui
Hepatic steatosis is an abnormal state where excess lipid mass is accumulated in hepatocyte vesicles. Backscattered ultrasound signals received from the liver contain useful information regarding the degree of steatosis in the liver. The homodyned-K (HK) distribution has been demonstrated as a general model for ultrasound backscattering. The estimator based on the first three integer moments (denoted as "FTM") of the intensity has potential for practical applications because of its simplicity and low computational complexity...
February 15, 2018: Ultrasonics
Adriana Caracciolo, Dandan Lu, Nadia Balucani, Gianmarco Vanuzzo, Domenico Stranges, Xingan Wang, Jun Li, Hua Guo, Piergiorgio Casavecchia
A combined experimental/theoretical study is performed to advance our understanding of the dynamics of the prototypical tetra-atom, complex-forming reaction OH + CO→ H + CO2 , which is also of great practical relevance in combustion, Earth atmosphere and, potentially, Mars' atmosphere and interstellar chemistry. New crossed molecular beam experiments with mass spectrometric detection are analyzed together with the results from previous experiments and compared with quasi-classical trajectory (QCT) calculations on a new, full-dimensional potential energy surface (PES)...
February 22, 2018: Journal of Physical Chemistry Letters
Htoo W Paing, R Kenneth Marcus
A practical method for preparation of solution residue samples for analysis utilizing the ambient desorption liquid sampling-atmospheric pressure glow discharge optical emission spectroscopy (AD-LS-APGD-OES) microplasma is described. Initial efforts involving placement of solution aliquots in wells drilled into copper substrates, proved unsuccessful. A design-of-experiment (DOE) approach was carried out to determine influential factors during sample deposition including solution volume, solute concentration, number of droplets deposited, and the solution matrix...
February 20, 2018: Analyst
Jiacheng Yang, Patrick Roth, Thomas D Durbin, Kent C Johnson, David R Cocker, Akua Asa-Awuku, Rasto Brezny, Michael Geller, Georgios Karavalakis
We assessed the gaseous, particulate, and genotoxic pollutants from two current technology gasoline direct injection vehicles when tested in their original configuration and with a catalyzed gasoline particulate filter (GPF). Testing was conducted over the LA92 and US06 Supplemental Federal Test Procedure (US06) driving cycles on typical California E10 fuel. The use of a GPF did not show any fuel economy and carbon dioxide (CO2) emission penalties, while the emissions of total hydrocarbons (THC), carbon monoxide (CO), and nitrogen oxides (NOx) were generally reduced...
February 15, 2018: Environmental Science & Technology
Vincenzo Nuzzo, Tiziana Attardo, Giuseppe Augello, Davide Brancato, Salvatore Camerlingo, Clelia Canale, Federica Coretti, Alessandro Franco, Francesco Giacometti, Maurizio Gambacorta, Massimo Loreno, Ada Maffettone, Vincenzo Provenzano, Alfonso Zuccoli
Audit is a clinical instrument of government characterized by a whole process of evaluation inter pares to improve medical behaviors in the clinical practice. Different endocrinopathies are underestimated in the clinical and diagnostics practice but they can be a real problem in patients admitted in the departments of Internal Medicine. The Adrenal Incidentaloma (AI) is an accidental discovery with an incidence equal to 4% in radiologic studies but it's rarely considereted in the internal disorders. In the departments of Internal Medicine are hospitalized each year approximately 1...
February 13, 2018: Minerva Endocrinologica
Rienk M A van der Slikke, Annemarie M H de Witte, Monique A M Berger, Daan J J Bregman, Dirk Jan H E J Veeger
PURPOSE: The purpose of this study was to provide insight in the effect of wheelchair settings on wheelchair mobility performance. METHODS: Twenty elite wheelchair basketball athletes of low (n=10) and high classification (n=10), were tested in a wheelchair basketball directed field test. Athletes performed the test in their own wheelchair, which was modified for five additional conditions regarding seat height (high - low), mass (central - distributed) and grip...
February 12, 2018: International Journal of Sports Physiology and Performance
Melissa J Armstrong
Physician burnout is gaining increased attention in medicine and neurology and often relates to hours worked and insufficient time. One component of this is administrative burden, which relates to regulatory requirements and electronic health record tasks but may also involve increased time spent processing emails. Research in academic medical centers demonstrates that physicians face increasing inbox sizes related to mass distribution emails from various sources on top of emails required for patient care, research, and teaching...
December 2017: Neurology. Clinical Practice
Guisheng Zhou, Yulong Zhang, Yang Li, Mengyue Wang, Xiaobo Li
Mogroside V, a natural compound isolated from the fruits of Siraitia grosvenorii (Swingle), is a promising candidate for anti-diabetic activity. The present study aims to develop a simple and practical strategy for comparing the in vivo metabolite profiling of mogroside V in healthy and type 2 diabetic (T2D) model rats. In this paper, a highly sensitive and rapid ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS) with MetaboLynx™ software combined with mass defect filtering (MDF) method was established and successfully applied to detect and identify the metabolites in plasma, urine, bile and feces samples of healthy and model rats administrated with mogroside V...
February 6, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Kevin Ryan, Douglas George, James Liu, Patricia Mitchell, Kerrie Nelson, Ricky Kue
BACKGROUND: Mass casualty incident (MCI) triage and the use of triage tags to assign treatment priorities are not fully implemented despite emergency medical services (EMS) personnel training during drills and exercises. OBJECTIVES: To compare current field triage practices during both training and actual MCIs and identify any potential barriers to use. METHODS: During training sessions from November 2015 through March 2016, an anonymous survey was distributed to personnel in 3 distinct types of paid full-time EMS systems: Boston EMS (2-tiered, municipal third-service); Portland Fire Department (fire department-based ALS); and Stokes County EMS (county-based ALS) combined with Forsyth County EMS (county-based ALS)...
February 9, 2018: Prehospital Emergency Care
Bo-Hyun Kim, Mark K Larson, Heather E Lawson
Bumps and other types of dynamic failure have been a persistent, worldwide problem in the underground coal mining industry, spanning decades. For example, in just five states in the U.S. from 1983 to 2014, there were 388 reportable bumps. Despite significant advances in mine design tools and mining practices, these events continue to occur. Many conditions have been associated with bump potential, such as the presence of stiff units in the local geology. The effect of a stiff sandstone unit on the potential for coal bumps depends on the location of the stiff unit in the stratigraphic column, the relative stiffness and strength of other structural members, and stress concentrations caused by mining...
January 2018: International Journal of Mining Science and Technology
Michael C Cao, Yimo Han, Zhen Chen, Yi Jiang, Kayla X Nguyen, Emrah Turgut, Gregory D Fuchs, David A Muller
What does the diffraction pattern from a single atom look like? How does it differ from the scattering from long-range potential? With the development of new high-dynamic range pixel array detectors to measure the complete momentum distribution, these questions have immediate relevance for designing and understanding momentum-resolved imaging modes. We explore the asymptotic limits of long-range and short-range potentials. We use a simple quantum mechanical model to explain the general and asymptotic limits for the probability distribution in both real and reciprocal space...
December 29, 2017: Microscopy
Susan M Astley, Elaine F Harkness, Jamie C Sergeant, Jane Warwick, Paula Stavrinos, Ruth Warren, Mary Wilson, Ursula Beetles, Soujanya Gadde, Yit Lim, Anil Jain, Sara Bundred, Nicola Barr, Valerie Reece, Adam R Brentnall, Jack Cuzick, Tony Howell, D Gareth Evans
BACKGROUND: High mammographic density is associated with both risk of cancers being missed at mammography, and increased risk of developing breast cancer. Stratification of breast cancer prevention and screening requires mammographic density measures predictive of cancer. This study compares five mammographic density measures to determine the association with subsequent diagnosis of breast cancer and the presence of breast cancer at screening. METHODS: Women participating in the "Predicting Risk Of Cancer At Screening" (PROCAS) study, a study of cancer risk, completed questionnaires to provide personal information to enable computation of the Tyrer-Cuzick risk score...
February 5, 2018: Breast Cancer Research: BCR
L Omar Rivera, Jessica Danielle Ford, Meredith Marie Hartzell, Todd Allan Hoover
PURPOSE: To examine whether Army community members participating in a best-practice based workplace health promotion program (WHPP) experience goal-moderated improvements in health-related outcomes. DESIGN: Pretest/posttest outcome evaluation examining an autonomously participating client cohort over 1 year. SETTING: Army Wellness Center facilities on 19 Army installations. PARTICIPANTS: Army community members sample (N = 5703), mostly Active Duty Soldiers (64%)...
January 1, 2018: American Journal of Health Promotion: AJHP
Sarah Braungart, Ross J Craigie, Paul D Losty
BACKGROUND: No clear treatment and follow-up protocols have been established for prepubertal patients with ovarian tumours. The lack of adequate prospective data in the literature includes all aspects of their management. A significant number of children with ovarian masses present out of hours as a surgical emergency and are initially managed by paediatric surgeons without special interest in surgical oncology. Clear guidance on the management of such tumours is therefore fundamental...
December 27, 2017: Journal of Pediatric Surgery
Jose Ignacio Priego Quesada, Zachary Y Kerr, William M Bertucci, Felipe P Carpes
Sampling bias is an issue for research involving cyclists. The heterogeneity of cyclist populations, on the basis of skill level and riding purpose, can generate incorrect inferences about one specific segment of the population of interest. In addition, a more accurate categorization would be helpful when physiological parameters are not available. This study proposes using self-reported data to categorize amateur cyclist types by varying skill levels and riding purposes, therefore improving sample selection in experimental studies...
January 25, 2018: Journal of Sports Sciences
Peter Desmond, James P Best, Eberhard Morgenroth, Nicolas Derlon
The effect of extracellular polymeric substances (EPS) on the meso-scale physical structure and hydraulic resistance of membrane biofilms during gravity driven membrane (GDM) filtration was investigated. Biofilms were developed on the surface of ultrafiltration membranes during dead-end filtration at ultra-low pressure (70 mbar). Biofilm EPS composition (total protein, polysaccharide and eDNA) was manipulated by growing biofilms under contrasting nutrient conditions. Nutrient conditions consisted of (i) a nutrient enriched condition with a nutrient ratio of 100:30:10 (C: N: P), (ii) a phosphorus limitation (C: N: P ratio: 100:30:0), and (iii) a nitrogen limitation (C: N: P ratio: 100:0:10)...
December 27, 2017: Water Research
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