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https://www.readbyqxmd.com/read/28107368/multi-channel-optical-coherence-elastography-using-relative-and-absolute-shear-wave-time-of-flight
#1
Eli Elyas, Alex Grimwood, Janine T Erler, Simon P Robinson, Thomas R Cox, Daniel Woods, Peter Clowes, Ramona De Luca, Franco Marinozzi, Jérémie Fromageau, Jeffrey C Bamber
Elastography, the imaging of elastic properties of soft tissues, is well developed for macroscopic clinical imaging of soft tissues and can provide useful information about various pathological processes which is complementary to that provided by the original modality. Scaling down of this technique should ply the field of cellular biology with valuable information with regard to elastic properties of cells and their environment. This paper evaluates the potential to develop such a tool by modifying a commercial optical coherence tomography (OCT) device to measure the speed of shear waves propagating in a three-dimensional (3D) medium...
2017: PloS One
https://www.readbyqxmd.com/read/28105822/functional-group-coverage-and-conversion-quantification-in-nanostructured-silica-by-1-h-nmr
#2
Carina I C Crucho, Carlos Baleizão, José Paulo S Farinha
Silica nanostructured materials are important in many fields, including catalysis, imaging, and drug delivery, mainly due to the versatility of surface functionalization that can bestow a huge variety of chemical and physical properties. With most applications requiring precise control over this surface modification, characterization of surface composition and reactivity have become of extreme importance. We present a novel approach to track silica surface modification and quantify functional group coverage using only solution NMR...
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28105596/monitoring-nutrients-fate-after-digestate-spreading-in-a-short-rotation-buffer-area
#3
Nicolò Colombani, Bruno Boz, Bruna Gumiero, Micòl Mastrocicco
One of the main sources of reactive nitrogen pollution is animal manure. The disposal of digestate (material remaining after the anaerobic digestion of a biodegradable feedstock) in agricultural soils could solve both the problems of soil fertilization and waste removal, but the fate of digestate in the environment must be assessed carefully before its massive utilization. To investigate whether digestate could be safely employed as a soil fertilizer, an agricultural field located in Monastier di Treviso (Northern Italy) and characterized by the presence of low hydraulic conductivity clay soils, was selected to be amended with bovine digestate...
January 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28104922/volumetric-doppler-angle-correction-for-ultrahigh-resolution-optical-coherence-doppler-tomography
#4
Jiang You, Ang Li, Congwu Du, Yingtian Pan
Ultrahigh-resolution optical coherence Doppler tomography (μODT) demonstrates great potential for quantitative blood flow imaging owing to its large field of view and capillary resolution. However, μODT only detects the axial flow velocity and requires Doppler angle correction to retrieve the absolute velocity. Although methods for Doppler angle tracking of single or few large vessels have been reported, a method that enables angle correction of the entire 3D microvascular networks remains a challenge. Here, we present a method based on eigenvalue analysis of 3D Hessian matrix to retrieve the orientation of each tubular vessel...
January 2, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28103804/inactivity-periods-and-postural-change-speed-can-explain-atypical-postural-change-patterns-of-caenorhabditis-elegans-mutants
#5
Tsukasa Fukunaga, Wataru Iwasaki
BACKGROUND: With rapid advances in genome sequencing and editing technologies, systematic and quantitative analysis of animal behavior is expected to be another key to facilitating data-driven behavioral genetics. The nematode Caenorhabditis elegans is a model organism in this field. Several video-tracking systems are available for automatically recording behavioral data for the nematode, but computational methods for analyzing these data are still under development. RESULTS: In this study, we applied the Gaussian mixture model-based binning method to time-series postural data for 322 C...
January 19, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28102833/a-multimodal-approach-to-estimating-vigilance-using-eeg-and-forehead-eog
#6
Wei-Long Zheng, Baoliang Lu
OBJECTIVE: Covert aspects of ongoing user mental states provide key context information for user-aware human computer interactions. In this paper, we focus on the problem of estimating the vigilance of users using EEG and EOG signals. APPROACH: The PERCLOS index as vigilance annotation is obtained from eye tracking glasses. To improve the feasibility and wearability of vigilance estimation devices for real-world applications, we adopt a novel electrode placement for forehead EOG and extract various eye movement features, which contain the principal information of traditional EOG...
January 19, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28101132/what-are-good-outcomes-in-public-mental-health-settings-a-qualitative-exploration-of-clients-and-therapists-experiences
#7
Christian Moltu, Jon Stefansen, Jan Christian Nøtnes, Åse Skjølberg, Marius Veseth
BACKGROUND: The mental health field sees a surge of interest in Routine Outcome Monitoring, mandated by a wish to help better those not-on-track to recovery. What constitutes positive outcomes for these patients is not fully understood. AIMS: To contribute knowledge into what constitutes meaningful outcome concepts in the experiences of patients with long and complex mental health suffering and treatment, and the clinicians who work to help them. METHODS: A qualitative in-depth study of 50 participants' experiences...
2017: International Journal of Mental Health Systems
https://www.readbyqxmd.com/read/28100743/three-small-receptive-field-ganglion-cells-in-the-mouse-retina-are-distinctly-tuned-to-size-speed-and-object-motion
#8
Jason Jacoby, Gregory W Schwartz
: Retinal ganglion cells (RGCs) are frequently divided into functional types by their ability to extract and relay specific features from a visual scene, such as the capacity to discern local or global motion, direction of motion, stimulus orientation, contrast or uniformity, or the presence of large or small objects. Here we introduce three previously uncharacterized, nondirection-selective ON-OFF RGC types that represent a distinct set of feature detectors in the mouse retina. The three high-definition (HD) RGCs possess small receptive-field centers and strong surround suppression...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28100406/modeling-of-path-planning-and-needle-steering-with-path-tracking-in-anatomical-soft-tissues-for-minimally-invasive-surgery
#9
Pan Li, Shan Jiang, Dong Liang, Zhiyong Yang, Yan Yu, Wei Wang
Steerable needles can potentially improve the effectiveness of diagnostic and therapeutic procedures, such as biopsy and cancer treatment, by increasing the targeting accuracy and reaching previously inaccessible targets. A discrete potential field algorithm based on three dimensional (3D) anatomical structures is proposed in this paper to plan the needle path in minimally invasive surgery. A 3D kinematic model of needle steering is formulated using Lie group theory. Model parameters are fitted using experimental data acquired via a 2-degree of freedom robotic device and an ultrasound imaging device...
January 16, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28098772/a-non-intrusive-cyber-physical-social-sensing-solution-to-people-behavior-tracking-mechanism-prototype-and-field-experiments
#10
Yunjian Jia, Zhenyu Zhou, Fei Chen, Peng Duan, Zhen Guo, Shahid Mumtaz
Tracking people's behaviors is a main category of cyber physical social sensing (CPSS)-related people-centric applications. Most tracking methods utilize camera networks or sensors built into mobile devices such as global positioning system (GPS) and Bluetooth. In this article, we propose a non-intrusive wireless fidelity (Wi-Fi)-based tracking method. To show the feasibility, we target tracking people's access behaviors in Wi-Fi networks, which has drawn a lot of interest from the academy and industry recently...
January 13, 2017: Sensors
https://www.readbyqxmd.com/read/28096132/innovative-techniques-for-evaluating-behavioral-nutrition-interventions
#11
REVIEW
Rachel E Scherr, Kevin D Laugero, Dan J Graham, Brian T Cunningham, Lisa Jahns, Karina R Lora, Marla Reicks, Amy R Mobley
Assessing outcomes and the impact from behavioral nutrition interventions has remained challenging because of the lack of methods available beyond traditional nutrition assessment tools and techniques. With the current high global obesity and related chronic disease rates, novel methods to evaluate the impact of behavioral nutrition-based interventions are much needed. The objective of this narrative review is to describe and review the current status of knowledge as it relates to 4 different innovative methods or tools to assess behavioral nutrition interventions...
January 2017: Advances in Nutrition
https://www.readbyqxmd.com/read/28095478/evaluating-silent-reading-performance-with-an-eye-tracking-system-in-patients-with-glaucoma
#12
Noriaki Murata, Daiki Miyamoto, Tetsuya Togano, Takeo Fukuchi
OBJECTIVE: To investigate the relationship between silent reading performance and visual field defects in patients with glaucoma using an eye tracking system. METHODS: Fifty glaucoma patients (Group G; mean age, 52.2 years, standard deviation: 11.4 years) and 20 normal controls (Group N; mean age, 46.9 years; standard deviation: 17.2 years) were included in the study. All participants in Group G had early to advanced glaucomatous visual field defects but better than 20/20 visual acuity in both eyes...
2017: PloS One
https://www.readbyqxmd.com/read/28088508/relationship-between-central-retinal-vessel-trunk-location-and-visual-field-loss-in-glaucoma
#13
Mengyu Wang, Hui Wang, Louis R Pasquale, Neda Baniasadi, Lucy Q Shen, Peter J Bex, Tobias Elze
PURPOSE: To study the relationship between horizontal central retinal vessel trunk location (CRVTL) on glaucomatous optic discs and sector-specific visual field (VF) loss. DESIGN: Retrospective, cross-sectional study. METHODS: CRVTL of 421 eyes from 421 patients was manually tracked on the horizontal optic disc axis on fundus images. Focal circumpapillary retinal nerve fiber layer thickness (cpRNFLT) measurements were extracted from optical coherence tomography (OCT)...
January 11, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28087416/the-path-of-a-click-stimulus-from-ear-canal-to-umbo
#14
Mario Milazzo, Elika Fallah, Michael Carapezza, Nina S Kumar, Jason H Lei, Elizabeth S Olson
The tympanic membrane (TM) has a key role in transmitting sounds to the inner ear, but a concise description of how the TM performs this function remains elusive. This paper probes TM operation by applying a free field click stimulus to the gerbil ear and exploring the consequent motions of the TM and umbo. Motions of the TM were measured both on radial tracks starting close to the umbo and on a grid distal and adjacent to the umbo. The experimental results confirmed the high fidelity of sound transmission from the ear canal to the umbo...
January 10, 2017: Hearing Research
https://www.readbyqxmd.com/read/28087244/practice-makes-perfect-correlations-between-prior-experience-in-high-level-athletics-and-robotic-surgical-performance-do-not-persist-after-task-repetition
#15
Kevin Shee, Fady M Ghali, Elias S Hyams
OBJECTIVE: Robotic surgical skill development is central to training in urology as well as in other surgical disciplines. Here, we describe a pilot study assessing the relationships between robotic surgery simulator performance and 3 categories of activities, namely, videogames, musical instruments, and athletics. DESIGN: A questionnaire was administered to preclinical medical students for general demographic information and prior experiences in surgery, videogames, musical instruments, and athletics...
January 10, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28081156/generation-of-a-stable-transgenic-swine-model-expressing-a-porcine-histone-2b-egfp-fusion-protein-for-cell-tracking-and-chromosome-dynamics-studies
#16
Renan B Sper, Sehwon Koh, Xia Zhang, Sean Simpson, Bruce Collins, Jeff Sommer, Robert M Petters, Ignacio Caballero, Jeff L Platt, Jorge A Piedrahita
Transgenic pigs have become an attractive research model in the field of translational research, regenerative medicine, and stem cell therapy due to their anatomic, genetic and physiological similarities with humans. The development of fluorescent proteins as molecular tags has allowed investigators to track cell migration and engraftment levels after transplantation. Here we describe the development of two transgenic pig models via SCNT expressing a fusion protein composed of eGFP and porcine Histone 2B (pH2B)...
2017: PloS One
https://www.readbyqxmd.com/read/28075330/building-an-open-source-simulation-platform-of-acoustic-radiation-force-based-breast-elastography
#17
Yu Wang, Bo Peng, Jingfeng Jiang
Ultrasound-based elastography techniques including quasi-static strain elastography (SE), acoustic radiation force Impulse (ARFI) imaging, point shear wave elastography (pSWE) and supersonic shear imaging (SSI) have been used to differentiate breast tumors. The objective of this study is to extend a previously published virtual simulation platform of SE toward acoustic radiation force-based breast elastography. The proposed platform inherited four key components from the previously published virtual SE platform: an ultrasound simulator (Field II), a mesh generator (Tetgen), a finite element (FE) solver (FEBio) and a visualization and data processing package (VTK)...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28073074/tribocorrosion-behavior-of-bio-functionalized-highly-porous-titanium
#18
F Toptan, A C Alves, A M P Pinto, P Ponthiaux
Titanium and its alloys are widely used in orthopedic and dental implants, however, some major clinical concerns such as poor wear resistance, lack of bioactivity, and bone resorption due to stress shielding are yet to be overcome. In order to improve these drawbacks, highly porous Ti samples having functionalized surfaces were developed by powder metallurgy with space holder technique followed by anodic treatment. Tribocorrosion tests were performed in 9g/L NaCl solution using a unidirectional pin-on-disc tribometer under 3N normal load, 1Hz frequency and 4mm track diameter...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28066693/society-of-pediatric-psychology-workforce-survey-development-of-survey-methods-sample-characteristics-and-lessons-learned
#19
Tim Wysocki, Cheryl L Brosig, Marisa E Hilliard
There are few detailed workforce studies of specialty fields within professional psychology, and none have been reported for pediatric psychology since 2006. Availability of such data could facilitate more-informed decision making by students and trainees, psychologists pursuing employment opportunities, and psychologists involved in employment or compensation negotiations. This article describes the work of a task force of the American Psychological Association (APA) Division 54 (Society of Pediatric Psychology) in the design, construction, pretesting, distribution, and data management for the Society of Pediatric Psychology (SPP) Workforce Survey...
March 2016: Clinical Practice in Pediatric Psychology
https://www.readbyqxmd.com/read/28064032/tmj-energy-densities-in-healthy-men-and-women
#20
L R Iwasaki, Y M Gonzalez, Y Liu, H Liu, M Markova, L M Gallo, J C Nickel
OBJECTIVE: Cartilage fatigue, due to mechanical work, may account for the early development of degenerative joint disease (DJD) in the temporomandibular joint (TMJ), and why women are three times more likely to be afflicted. This study tested for gender differences in mechanical energy densities in women and men with healthy TMJs. DESIGN: Eighteen women and eighteen men gave informed consent. Research diagnostic criteria including imaging were used to ensure that subjects' TMJs were normal, without disc displacement or signs of DJD...
January 5, 2017: Osteoarthritis and Cartilage
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