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https://www.readbyqxmd.com/read/27914178/longitudinal-assessment-of-examiner-experience-and-the-accuracy-of-sonographic-fetal-weight-estimation-at-term
#1
Florian Faschingbauer, Jutta Heimrich, Eva Raabe, Sven Kehl, Michael Schneider, Matthias Schmid, Matthias W Beckmann, Tobias Hepp, Anika Lübke, Andreas Mayr, Ralf L Schild
OBJECTIVES: To evaluate the influence of examiner experience on the accuracy of sonographic weight estimation and to further analyze examiners' individual learning curves. METHODS: In this multicenter study, 4613 sonographic weight estimations performed by 18 examiners at the beginning of their ultrasound training were included. To assess the effect of experience on the accuracy of weight estimation, a multivariable mixed regression model analysis was performed, with percentage error and absolute percentage error as outcome variables and the examiner, the examiner's experience (number of examinations), birth weight, gestational age, scan-to-delivery interval, and maternal body mass index as fixed effects and the perinatal center as random intercepts...
December 3, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27913951/stereolithography-based-3d-printed-pillar-plates-that-minimizes-fluid-transfers-during-enzyme-linked-immunosorbent-assays
#2
Justin D McCallen, Alison Schaefer, Phoebe Lee, Loretta Hing, Samuel K Lai
Enzyme linked immunosorbent assay (ELISA) is one of the most popular and indispensable tools in molecular biology. Despite numerous advances in ELISA methods that markedly improve the sensitivity and throughput of detection, a hallmark of all ELISA continues to be repeated pipetting of fluids that is not only cumbersome but can easily introduce errors or contaminations. Robotics, despite obvious advantages, remains expensive. Here, we designed and produced cheap "pillar plates" using stereolithography-based 3D printing that can be readily inserted into conventional 96- and 384- well plates and serve as the substrate for ELISA...
December 2, 2016: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/27913837/hospitalizations-due-to-preventable-adverse-reactions-a-systematic-review
#3
REVIEW
Nidhi S Patel, Tejas K Patel, Parvati B Patel, Viren N Naik, C B Tripathi
PURPOSE: The study aimed to measure the percentage of preventable adverse drug reactions that lead to the hospitalization (PADRAd) and to explore the heterogeneity in its estimation through subgroup analysis of study characteristics. METHODS: Two investigators independently searched in electronic databases and related bibliography for prospective studies involving PADRAd. We excluded studies investigating medication errors and spontaneous and retrospective reporting...
December 2, 2016: European Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/27913599/the-effect-of-food-quality-during-growth-on-spatial-memory-consolidation-in-adult-pigeons
#4
M F Scriba, J Gasparini, L Jacquin, C Mettke-Hofmann, N C Rattenborg, A Roulin
Poor environmental conditions experienced during early development can have negative long-term consequences on fitness. Animals can compensate negative developmental effects through phenotypic plasticity by diverting resources from non-vital to vital traits such as spatial memory to enhance foraging efficiency. We tested in young feral pigeons (Columba livia) how diets of different nutritional value during development affect the capacity to retrieve food hidden in a spatially complex environment, a process we refer to as "spatial memory"...
December 2, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27913370/asymptotic-fuzzy-neural-network-control-for-pure-feedback-stochastic-systems-based-on-a-semi-nussbaum-function-technique
#5
Ci Chen, Zhi Liu, Kan Xie, Yun Zhang, C L Philip Chen
Most existing control results for pure-feedback stochastic systems are limited to a condition that tracking errors are bounded in probability. Departing from such bounded results, this paper proposes an asymptotic fuzzy neural network control for pure-feedback stochastic systems. The control goal is realized by proposing a novel semi-Nussbaum function-based technique and employing it in adaptive backstepping controller design. The proposed Nussbaum function is integrated with adaptive control technique to guarantee that the tracking error is asymptotically stable in probability...
November 28, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/27913369/adaptive-optimal-control-using-frequency-selective-information-of-the-system-uncertainty-with-application-to-unmanned-aircraft
#6
Arnab Maity, Leonhard Hocht, Christian Heise, Florian Holzapfel
A new efficient adaptive optimal control approach is presented in this paper based on the indirect model reference adaptive control (MRAC) architecture for improvement of adaptation and tracking performance of the uncertain system. The system accounts here for both matched and unmatched unknown uncertainties that can act as plant as well as input effectiveness failures or damages. For adaptation of the unknown parameters of these uncertainties, the frequency selective learning approach is used. Its idea is to compute a filtered expression of the system uncertainty using multiple filters based on online instantaneous information, which is used for augmentation of the update law...
November 28, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/27913360/real-time-decentralized-neural-control-via-backstepping-for-a-robotic-arm-powered-by-industrial-servomotors
#7
Luis A Vazquez, Francisco Jurado, Carlos E Castaneda, Victor Santibanez
This paper presents a continuous-time decentralized neural control scheme for trajectory tracking of a two degrees of freedom direct drive vertical robotic arm. A decentralized recurrent high-order neural network (RHONN) structure is proposed to identify online, in a series-parallel configuration and using the filtered error learning law, the dynamics of the plant. Based on the RHONN subsystems, a local neural controller is derived via backstepping approach. The effectiveness of the decentralized neural controller is validated on a robotic arm platform, of our own design and unknown parameters, which uses industrial servomotors to drive the joints...
December 1, 2016: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/27913348/automatic-refinement-strategies-for-manual-initialization-of-object-trackers
#8
Hao Zhu, Fatih Porikli
Tracking objects across multiple frames is a wellinvestigated problem in computer vision. The majority of the existing algorithms assume an accurate initialization is readily available. However, in many real-life settings, in particular for applications where the video is streaming in real-time, the initialization has to be provided by a human operator. This limitation raises an inevitable uncertainty issue. Here, we first collect a large and new dataset of inputs that consists of more than 20K human initialization clicks, called as HIC, by several subjects under three practical user interface scenarios for the popular TB50 tracking benchmark...
December 1, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27913340/efficient-3d-reconstruction-in-ultrasound-elastography-via-a-sparse-iteration-based-on-markov-random-fields
#9
Atul Ingle, Tomy Varghese, William Sethares
Percutaneous needle-based liver ablation procedures are becoming increasingly common for treatment of small isolated tumors in hepatocellular carcinoma patients who are not candidates for surgery. Rapid three dimensional visualization of liver ablations has potential clinical value because it can enable interventional radiologists to plan and execute needle-based ablation procedures with real time feedback. Ensuring the right volume of tissue is ablated is desirable to avoid recurrence of tumors from residual untreated cancerous cells...
November 29, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27913178/estimating-the-material-properties-of-heel-pad-sub-layers-using-inverse-finite-element-analysis
#10
Nafiseh Ahanchian, Christopher J Nester, David Howard, Lei Ren, Daniel Parker
Detailed information about the biomechanical behaviour of plantar heel pad tissue contributes to our understanding of load transfer when the foot impacts the ground. The objective of this work was to obtain the hyperelastic and viscoelastic material properties of heel pad sub-layers (skin, micro-chamber and macro-chamber layers) in-vivo. An anatomically detailed 3D Finite Element model of the human heel was used to derive the sub-layer material properties. A combined ultrasound imaging and motorised platform system was used to compress heel pad and to create input data for the Finite Element model...
November 29, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27913156/the-oral-spelling-profile-of-posterior-cortical-atrophy-and-the-nature-of-the-graphemic-representation
#11
Silvia Primativo, Keir X X Yong, Timothy J Shakespeare, Sebastian J Crutch
Spelling is a complex cognitive task where central and peripheral components are involved in engaging resources from many different cognitive processes. The present paper aims to both characterize the oral spelling deficit in a population of patients affected by a neurodegenerative condition and to clarify the nature of the graphemic representation within the currently available spelling models. Indeed, the nature of graphemic representation as a linear or multi-componential structure is still debated. Different hypotheses have been raised about its nature in the orthographic lexicon, with one positing that graphemes are complex objects whereby quantity and identity are separately represented in orthographic representations and can thus be selectively impaired...
November 29, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27913131/using-phenomenological-models-for-forecasting-the-2015-ebola-challenge
#12
Bruce Pell, Yang Kuang, Cecile Viboud, Gerardo Chowell
BACKGROUND: The rising number of novel pathogens threatening the human population has motivated the application of mathematical modeling for forecasting the trajectory and size of epidemics. MATERIALS AND METHODS: We summarize the real-time forecasting results of the logistic equation during the 2015 Ebola challenge focused on predicting synthetic data derived from a detailed individual-based model of Ebola transmission dynamics and control. We also carry out a post-challenge comparison of two simple phenomenological models...
November 19, 2016: Epidemics
https://www.readbyqxmd.com/read/27912967/qualitative-analysis-of-copaifera-oleoresin-using-comprehensive-two-dimensional-gas-chromatography-and-gas-chromatography-with-classical-and-cold-electron-ionisation-mass-spectrometry
#13
Yong Foo Wong, Thais M Uekane, Claudia M Rezende, Humberto R Bizzo, Philip J Marriott
Improved separation of both sesquiterpenes and diterpenic acids in Copaifera multijuga Hayne oleoresin, is demonstrated by using comprehensive two-dimensional gas chromatography (GC×GC) coupled to accurate mass time-of-flight mass spectrometry (accTOFMS). GC×GC separation employs polar phases (including ionic liquid phases) as the first dimension ((1)D) column, combined with a lower polarity (2)D phase. Elution temperatures (Te) of diterpenic acids (in methyl ester form, DAME) increased as the (1)D McReynolds' polarity value of the column phase decreased...
November 22, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27912915/modeling-sampling-strategies-for-determination-of-zooplankton-abundance-in-ballast-water
#14
Marco R Hernandez, Mattias L Johansson, Yanyu Xiao, Mark A Lewis, Hugh J MacIsaac
Ballast water has been a major source of non-indigenous species introductions. The International Maritime Organization has proposed performance standard that will establish an upper limit for viable organisms in discharged ballast. Here we test different sampling efforts for zooplankton in ballast water on a commercial vessel. We fit different probability density functions to find the most representative and evaluated sampling efforts necessary to achieve error rates (α, β) of <0.05. Our tests encompassed four seasonal trials and five sample volumes...
November 29, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27912878/selecting-optimum-protein-nano-carriers-for-natural-polyphenols-using-chemoinformatics-tools
#15
AbdelKader A Metwally, Sherweit H El-Ahmady, Rania M Hathout
BACKGROUND: The normal fate of any natural product with a therapeutic potential is to be formulated into an effective medicine. However, the conventional methods of selecting the suitable formulations or carriers based on the formulator experiences, trials and errors as well as materials availability do not usually yield the optimal results. HYPOTHESIS: We hypothesize the possibility of the virtual optimum selection of a protein carrier for two polyphenolic compounds widely investigated for their chemopreventive effects; resveratrol and curcumin using a combination of some chemoinformatics tools...
December 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27912798/bilateral-anomalous-drainage-of-the-posterior-divisions-of-renal-veins-into-the-azygos-venous-system-in-a-20-year-old-woman-a-case-report
#16
Pedro Pallangyo, Frederick Lyimo, Paulina Nicholaus, Stephano Masatu, Mohamed Janabi
BACKGROUND: Renal vein anomalies are relatively infrequent and generally asymptomatic. Preoperative knowledge of such variants is, however, of paramount importance in several angiographic and surgical procedures including renal venography, renal vein sampling, spermatic embolization, and renal transplantation. Inadequate knowledge and failure to recognize such anatomic variations may lead to several operative hazards including hemorrhage, nephrectomy, and even death. CASE PRESENTATION: We report a case of bilateral anomalous drainage of the posterior divisions of renal veins into the azygos venous system in a 20-year-old woman of African descent from Tanzania who presented to us with a 12-year history of recurrent anemia...
December 3, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27912743/str-realigner-a-realignment-method-for-short-tandem-repeat-regions
#17
Kaname Kojima, Yosuke Kawai, Kazuharu Misawa, Takahiro Mimori, Masao Nagasaki
BACKGROUND: In the estimation of repeat numbers in a short tandem repeat (STR) region from high-throughput sequencing data, two types of strategies are mainly taken: a strategy based on counting repeat patterns included in sequence reads spanning the region and a strategy based on estimating the difference between the actual insert size and the insert size inferred from paired-end reads. The quality of sequence alignment is crucial, especially in the former approaches although usual alignment methods have difficulty in STR regions due to insertions and deletions caused by the variations of repeat numbers...
December 3, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27912681/how-valid-are-wearable-physical-activity-trackers-for-measuring-steps
#18
Hyun-Sung An, Gregory C Jones, Seoung-Ki Kang, Gregory J Welk, Jung-Min Lee
Wearable activity trackers have become popular for tracking individual's daily physical activity, but little information is available to substantiate the validity of these devices in step counts. Thirty-five healthy individuals completed three conditions of activity tracker measurement: walking/jogging on a treadmill, walking over-ground on an indoor track, and a 24-hour free-living condition. Participants wore 10 activity trackers at the same time for both treadmill and over-ground protocol. Of these 10 activity trackers three were randomly given for 24-hour free-living condition...
December 2, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27912044/mutations-in-prosc-disrupt-cellular-pyridoxal-phosphate-homeostasis-and-cause-vitamin-b6-dependent-epilepsy
#19
Niklas Darin, Emma Reid, Laurence Prunetti, Lena Samuelsson, Ralf A Husain, Matthew Wilson, Basma El Yacoubi, Emma Footitt, W K Chong, Louise C Wilson, Helen Prunty, Simon Pope, Simon Heales, Karine Lascelles, Mike Champion, Evangeline Wassmer, Pierangelo Veggiotti, Valérie de Crécy-Lagard, Philippa B Mills, Peter T Clayton
Pyridoxal 5'-phosphate (PLP), the active form of vitamin B6, functions as a cofactor in humans for more than 140 enzymes, many of which are involved in neurotransmitter synthesis and degradation. A deficiency of PLP can present, therefore, as seizures and other symptoms that are treatable with PLP and/or pyridoxine. Deficiency of PLP in the brain can be caused by inborn errors affecting B6 vitamer metabolism or by inactivation of PLP, which can occur when compounds accumulate as a result of inborn errors of other pathways or when small molecules are ingested...
December 1, 2016: American Journal of Human Genetics
https://www.readbyqxmd.com/read/27912031/three-dimensional-reconstruction-of-preoperative-imaging-improves-surgical-success-in-laparoscopy
#20
Tobias Simpfendörfer, Ziyao Li, Claudia Gasch, Frederik Drosdzol, Markus Fangerau, Michael Müller, Lena Maier-Hein, Markus Hohenfellner, Dogu Teber
PURPOSE: To show the benefit of three-dimensional (3D) reconstructions of preoperative imaging for surgical performance. METHODS: A laparoscopic training environment with 15 hidden lymph nodes was designed. Three of them were marked with radiographic contrast agent and were only distinguishable from unmarked nodes via CT imaging. Thirty-six surgeons were divided into two groups. To group 1 the unprocessed CT data were shown. Group 2 was additionally shown a 3D reconstruction of the anatomy...
December 2, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
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