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https://www.readbyqxmd.com/read/29040943/liquid-chromatography-tandem-mass-spectrometry-direct-injection-analysis-of-organophosphorus-flame-retardants-in-ontario-surface-water-and-wastewater-effluent
#1
Chunyan Hao, Paul A Helm, David Morse, Eric J Reiner
Organophosphorus flame retardants (OPFRs) started to be used in plastics, electronics and furnishings back in the 1960s and became popular again last decade. They are now widely present in the environment and regarded as "new" emerging organic pollutants. An effective liquid chromatography-tandem mass spectrometry (LC-MS/MS) direct injection analysis (DIA) method was developed to monitor OPFR levels in aquatic environment. The removal of sample extraction and concentration steps not only improved operation efficiency, but also reduced the potential contamination commonly observed during the sample preparation process before...
October 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/29040910/intensity-inhomogeneity-correction-of-sd-oct-data-using-macular-flatspace
#2
Andrew Lang, Aaron Carass, Bruno M Jedynak, Sharon D Solomon, Peter A Calabresi, Jerry L Prince
Images of the retina acquired using optical coherence tomography (OCT) often suffer from intensity inhomogeneity problems that degrade both the quality of the images and the performance of automated algorithms utilized to measure structural changes. This intensity variation has many causes, including off-axis acquisition, signal attenuation, multi-frame averaging, and vignetting, making it difficult to correct the data in a fundamental way. This paper presents a method for inhomogeneity correction by acting to reduce the variability of intensities within each layer...
October 12, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/29040877/corpus-luteum-dynamics-after-ovulation-induction-with-or-without-previous-exposure-to-progesterone-in-prepubertal-nellore-heifers
#3
Dayane Priscila Vrisman, Natália Marins Bastos, Guilherme Fazan Rossi, Naiara Nantes Rodrigues, Luisa Pucci Bueno Borges, Augusto Ryonosuke Taira, Cláudia Cristina Paro de Paz, Guilherme de Paula Nogueira, Pedro Paulo Maia Teixeira, Fábio Morato Monteiro, Maria Emília Franco Oliveira
The objectives of this study were 1) to monitor corpus luteum (CL) dynamics after two different protocols of ovulation induction in prepubertal Nellore heifers, and 2) to determine differences in luteal function. Fifty-seven heifers (weight 289.61 ± 32.28 kg, BCS 5.66 ± 0.65, age 17.47 ± 0.81 months) were divided into two groups: GP4+GnRH received a progesterone (P4) device of 3rd use for 10 days, followed by the administration of 0.02 mg buserelin acetate (GnRH) 48 h after removal of the device, and GGnRH received only GnRH...
October 13, 2017: Theriogenology
https://www.readbyqxmd.com/read/29040734/geometrical-efficiency-of-plane-parallel-ionization-chambers-in-proton-scanning-beam
#4
N Mojzeszek, M Klodowska, W Komenda, L Stolarczyk, R Kopec, P Olko
For commissioning of a proton therapy unit depth dose distributions must be determined and introduced into the Treatment Planning System. In pencil beam scanning (PBS) technique, integral depth dose (IDD) acquisition should be performed with detector large enough to ensure entire beam laterally broadened by scattered and secondary contributions. The purpose of this article is to quantify, using measurements and Monte Carlo transport calculations, the ionization chamber's (IC) geometrical efficiency versus the chamber radius and proton beam energy...
October 11, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29040609/improving-patient-safety-and-efficiency-of-medication-reconciliation-through-the-development-and-adoption-of-a-computer-assisted-tool-with-automated-electronic-integration-of-population-based-community-drug-data-the-rightrx-project
#5
Robyn Tamblyn, Nancy Winslade, Todd C Lee, Aude Motulsky, Ari Meguerditchian, Melissa Bustillo, Sarah Elsayed, David L Buckeridge, Isabelle Couture, Christina J Qian, Teresa Moraga, Allen Huang
Background and Objective: Many countries require hospitals to implement medication reconciliation for accreditation, but the process is resource-intensive, thus adherence is poor. We report on the impact of prepopulating and aligning community and hospital drug lists with data from population-based and hospital-based drug information systems to reduce workload and enhance adoption and use of an e-medication reconciliation application, RightRx. Methods: The prototype e-medical reconciliation web-based software was developed for a cluster-randomized trial at the McGill University Health Centre...
October 11, 2017: Journal of the American Medical Informatics Association: JAMIA
https://www.readbyqxmd.com/read/29040386/robust-distributed-lag-models-using-data-adaptive-shrinkage
#6
Yin-Hsiu Chen, Bhramar Mukherjee, Sara D Adar, Veronica J Berrocal, Brent A Coull
Distributed lag models (DLMs) have been widely used in environmental epidemiology to quantify the lagged effects of air pollution on an outcome of interest such as mortality or cardiovascular events. Generally speaking, DLMs can be applied to time-series data where the current measure of an independent variable and its lagged measures collectively affect the current measure of a dependent variable. The corresponding distributed lag (DL) function represents the relationship between the lags and the coefficients of the lagged exposure variables...
October 12, 2017: Biostatistics
https://www.readbyqxmd.com/read/29040377/safest-practices-for-autologous-buttock-augmentation-with-fat-grafting-using-a-roller-pump-injection-technique
#7
Marc Everett, Rolando Morales, German Newall, Paul F Fortes, Kristi L Hustak, Christopher K Patronella, Henry A Mentz
Background: Autologous buttock augmentation with fat grafting has emerged as one of the preeminent modalities for body contouring employed by plastic surgeons today. Since 2009, we have used the roller pump injection technique. Objectives: This procedure can be performed safely without specialized equipment and eliminates the tasks of manual graft preparation and injection. We describe our technique and standard safety measures. The anatomy of and complications associated with liposuction and fat grafting were recorded and reviewed...
June 23, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/29040275/nocturnal-sleep-mediates-the-relationship-between-morningness-eveningness-preference-and-the-sleep-architecture-of-afternoon-naps-in-university-students
#8
Tzu-Yin Lee, Pi-Chen Chang, Ing-Jy Tseng, Min-Huey Chung
The present study investigated the parameters of nocturnal sleep that mediate the relationship between morningness-eveningness preference and the sleep architecture of naps in university students. This study had a cross-sectional, descriptive correlational design. The sleep architecture of 52 students invited to take an afternoon nap in the laboratory was recorded. The morningness-eveningness questionnaire (MEQ) was used to evaluate morningness-eveningness preference. An actigraph was used to collect students' nighttime sleep data in the week preceding the study...
2017: PloS One
https://www.readbyqxmd.com/read/29040263/tuberculosis-detection-and-the-challenges-of-integrated-care-in-rural-china-a-cross-sectional-standardized-patient-study
#9
Sean Sylvia, Hao Xue, Chengchao Zhou, Yaojiang Shi, Hongmei Yi, Huan Zhou, Scott Rozelle, Madhukar Pai, Jishnu Das
BACKGROUND: Despite recent reductions in prevalence, China still faces a substantial tuberculosis (TB) burden, with future progress dependent on the ability of rural providers to appropriately detect and refer TB patients for further care. This study (a) provides a baseline assessment of the ability of rural providers to correctly manage presumptive TB cases; (b) measures the gap between provider knowledge and practice and; (c) evaluates how ongoing reforms of China's health system-characterized by a movement toward "integrated care" and promotion of initial contact with grassroots providers-will affect the care of TB patients...
October 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29039921/molecular-cobalt-catalysts-for-o2-reduction-low-overpotential-production-of-h2o2-and-comparison-with-iron-based-catalysts
#10
Yu-Heng Wang, Michael L Pegis, James M Mayer, Shannon S Stahl
A series of mononuclear pseudo-macrocyclic cobalt complexes have been investigated as catalysts for O2 reduction. Each of these complexes, with CoIII/II reduction potentials that span nearly 400 mV, mediate highly selective two-electron reduction of O2 to H2O2 (93-99%) using decamethylferrocene (Fc*) as the reductant and acetic acid as the proton source. Kinetic studies reveal that the rate exhibits a first-order dependence on [Co] and [AcOH], but no dependence on [O2] or [Fc*]. A linear correlation is observed between log(TOF) vs...
October 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29039911/halide-re-shelled-quantum-dot-inks-for-infrared-photovoltaics
#11
James Z Fan, Mengxia Liu, Oleksandr Voznyy, Bin Sun, Larissa Levina, Rafael Quintero-Bermudez, Min Liu, Olivier Ouellette, F Pelayo Garcia de Arquer, Sjoerd Hoogland, Edward H Sargent
Colloidal quantum dots are promising materials for tandem solar cells that complement to silicon and perovskites. These devices are fabricated from solution phase; however, existing methods for making infrared-bandgap CQD inks suffer agglomeration and fusion during solution exchange. Here we develop a ligand exchange that provides robust surface protection and thereby avoids aggregation. First, we exchanged long oleic acid ligands to a mixed system comprised of medium-chain ammonium and anionic chloride ligands; then, we re-shelled the surface using short halides and pseudohalide ligands that enabled transfer to a polar solvent...
October 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29036924/bio-inspired-distributed-transmission-power-control-considering-qos-fairness-in-wireless-body-area-sensor-networks
#12
Chan-Jae Lee, Ji-Young Jung, Jung-Ryun Lee
Recently, the development of wireless body area sensor network (WBASN) has accelerated due to the rapid development of wireless technology. In the WBASN environment, many WBASNs coexist where communication ranges overlap with each other, resulting in the possibility of interference. Although nodes in a WBASN typically operate at a low power level, to avoid adversely affecting the human body, high transmission rates may be required to support some applications. In addition to this, since many varieties of applications exist in the WBASN environment, each prospective user may have different quality of service (QoS) requirements...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29036879/enhancement-of-digital-radiography-image-quality-using-a-convolutional-neural-network
#13
Yuewen Sun, Litao Li, Peng Cong, Zhentao Wang, Xiaojing Guo
Digital radiography system is widely used for noninvasive security check and medical imaging examination. However, the system has a limitation of lower image quality in spatial resolution and signal to noise ratio. In this study, we explored whether the image quality acquired by the digital radiography system can be improved with a modified convolutional neural network to generate high-resolution images with reduced noise from the original low-quality images. The experiment evaluated on a test dataset, which contains 5 X-ray images, showed that the proposed method outperformed the traditional methods (i...
October 10, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29036766/resistance-training-increases-fibroblast-growth-factor-21-and-irisin-levels-in-the-skeletal-muscle-of-zucker-diabetic-fatty-rats
#14
Hee-Jae Kim, Wook Song
PURPOSE: Although the fibroblast growth factor-21 (FGF-21) and irisin roles are well demonstrated in metabolic disease, there have been no reports investigating the effect of resistance exercise on FGF-21 and irisin levels in diabetic skeletal muscles. Therefore, this study aimed to investigate the change of FGF-21 and irisin levels in various skeletal muscles, and their association with muscle strength, following 8 weeks of resistance training using Zucker diabetic fatty rats (type 2 diabetic animal models)...
September 30, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/29036714/accounting-for-technical-noise-in-differential-expression-analysis-of-single-cell-rna-sequencing-data
#15
Cheng Jia, Yu Hu, Derek Kelly, Junhyong Kim, Mingyao Li, Nancy R Zhang
Recent technological breakthroughs have made it possible to measure RNA expression at the single-cell level, thus paving the way for exploring expression heterogeneity among individual cells. Current single-cell RNA sequencing (scRNA-seq) protocols are complex and introduce technical biases that vary across cells, which can bias downstream analysis without proper adjustment. To account for cell-to-cell technical differences, we propose a statistical framework, TASC (Toolkit for Analysis of Single Cell RNA-seq), an empirical Bayes approach to reliably model the cell-specific dropout rates and amplification bias by use of external RNA spike-ins...
September 25, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29036700/experimental-evaluation-of-neutron-shielding-materials
#16
X Campo, R Méndez, M A S Lacerda, D Garrido, M Embid, J Sanz
A new proposed design of neutron shielding material-based on the commercial material Borotron UH050 with an addition of Al(OH)3-is evaluated in order to determine if its neutron and gamma shielding properties match those of a reference material, NS4FR. Neutron and gamma dosimetry measurements are performed, as well as neutron spectrometry measurements and Monte Carlo simulations. Negligible differences are found between the materials for neutron shielding, while significant differences are found for gamma shielding...
September 28, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29036694/efficient-modulation-of-photosynthetic-apparatus-confers-desiccation-tolerance-in-the-resurrection-plant-boea-hygrometrica
#17
Tinghong Tan, Yanni Sun, Shishuai Luo, Chao Zhang, Huapeng Zhou, Honghui Lin
Boea hygrometrica (B. hygrometrica) can tolerate severe desiccation and resume photosynthetic activity rapidly upon water availability. However, little is known about the mechanisms by which B. hygrometrica adapts to dehydration and resumes competence upon rehydration. Here we determined how B. hygrometrica to deal with oxidative stress, excessive excitation/electron pressures as well as photosynthetic apparatus modulation during dehydration/rehydration. By measuring ROS generation and scavenging efficiency, we found that B...
September 19, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29036681/intra-specific-trends-of-lumen-and-wall-resistivities-of-vessels-within-the-stem-xylem-vary-among-three-woody-plants
#18
Hiroki Ooeda, Ichiro Terashima, Haruhiko Taneda
Water flow through xylem vessels encounters hydraulic resistance when passing through the vessel lumen and end wall. Comparative studies have reported that lumen and end wall resistivities co-limit water flow through stem xylem in several angiosperm woody species that have vessels of different average diameter and length. This study examined the intra-specific relationship between the lumen and end wall resistivities (Rlumen and Rwall) for vessels within the stem xylem using three deciduous angiosperm woody species found in temperate forest...
September 23, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29036408/physiological-differences-between-root-suckers-and-saplings-enlarge-the-regeneration-niche-in-eucryphia-cordifolia-cav
#19
Antonio B Escandón, Roke Rojas, Loreto V Morales, Luis J Corcuera, Rafael E Coopman, Susana Paula
Many clonal plants produce vegetative recruits that remain connected to the parent plant. Such connections permit resource sharing among ramets, explaining the high survival rates of vegetative recruits during establishment under suboptimal conditions for sexual regeneration. We propose that differences in the regeneration niches of sexual and vegetative recruits reflect different physiological adjustments caused by parental supply of resources to the ramets. We conducted ecophysiological measurements in saplings and root suckers of Eucryphia cordifolia Cav...
September 19, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29036397/polyploidy-influences-plant-environment-interactions-in-quaking-aspen-populus-tremuloides-michx
#20
Burke T Greer, Christopher Still, Grace L Cullinan, J Renée Brooks, Frederick C Meinzer
Quaking aspen (Populus tremuloides Michx.), a widespread and keystone tree species in North America, experienced heat and drought stress in the years 2002 and 2003 in the southwestern United States. This led to widespread aspen mortality that has altered the composition of forests, and is expected to occur again if climate change continues. Understanding interactions between aspen and its environments is essential to understanding future mortality risk in forests. Polyploidy, which is common in aspen, can modify plant structure and function and therefore plant-environment interactions, but the influence of polyploidy on aspen physiology is still not well understood...
September 26, 2017: Tree Physiology
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