keyword
https://read.qxmd.com/read/37870929/opportunistic-sightings-of-manta-rays-on-brazil-s-amazon-coast
#1
JOURNAL ARTICLE
Nayara Bucair, Héllida Negrão Dias, Ana Rita Onodera Palmeira Nunes, Keyton Kylson Fonseca Coelho, Rafaela Maria Serra de Brito, João Bráullio de Luna Sales, Getulio Rincon, Ronaldo Bastos Francini-Filho, June Dias Ferraz, Israel H A Cintra, Jorge Luiz Silva Nunes
Little is known about the ecology and distribution of mobulid rays along Brazil's extensive coastline. Here we report opportunistic sightings of manta rays (Mobula cf. birostris) in the Brazilian Amazon estuaries and the Great Amazon Reef System (GARS). These sightings consist of manta ray individuals stranded in tide pools, caught in artisanal fisheries, and footage obtained with a submersible. Future investigations on the spatial, temporal, and environmental drivers of manta rays' distribution on the northern Brazilian coast and the threats posed by fishing gear are warranted...
October 23, 2023: Journal of Fish Biology
https://read.qxmd.com/read/35421307/vat-photopolymerization-of-reinforced-styrene-butadiene-elastomers-a-degradable-scaffold-approach
#2
JOURNAL ARTICLE
Christopher Kasprzak, James R Brown, Keyton Feller, Philip J Scott, Viswanath Meenakshisundaram, Chris Williams, Timothy Long
Vat photopolymerization (VP) is a high-throughput additive manufacturing modality that also offers exceptional feature resolution and surface finish; however, the process is constrained by a limited selection of processable photocurable resins. Low resin viscosity (<10 Pa·s) is one of the most stringent process-induced constraints on resin processability, which in turn limits the mechanical performance of printed resin systems. Recently, the authors created a VP-processable photosensitive latex resin, where compartmentalization of the high molecular weight polymer chains into discrete particles resulted in the decoupling of viscosity from molecular weight...
April 14, 2022: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/34405691/be-responsible
#3
JOURNAL ARTICLE
Brian P Meier, Michael B Kitchens, Danielle E Kupersmith, Kristie E Houck, Nevada S Keyton, Sydney E Petrasic, Ethan H Schultz, Sierra S Sheriff, Matthew M Simmers, John O Underwood, Sara Walker, Daymond N Zweizig
<b/> The bystander effect reveals that people are less likely to help a person in need when others are present. We examined the impact of priming the concept of responsibility on the bystander effect in a field study. Lone pedestrians ( N = 259) were randomly assigned to a two (Bystanders: none and three nonresponsive bystanders) by two (Shirt: blank shirt and shirt with "Be Responsible" written on the front) design. A researcher dropped eight pens approximately 15 ft from a lone pedestrian, while wearing one of the two shirts in the presence/absence of bystanders (confederates)...
March 2021: Experimental Psychology
https://read.qxmd.com/read/34315279/regional-variation-of-corneal-stromal-deformation-measured-by-high-frequency-ultrasound-elastography
#4
JOURNAL ARTICLE
Sunny Kwok, Nicholas Hazen, Keyton Clayson, Xueliang Pan, Jun Liu
The cornea's mechanical response to intraocular pressure elevations may alter in ectatic diseases such as keratoconus. Regional variations of mechanical deformation in normal and keratoconus eyes during intraocular pressure elevation have not been well-characterized. We applied a high-frequency ultrasound elastography technique to characterize the regional deformation of normal and keratoconus human corneas through the full thickness of corneal stroma. A cross-section centered at the corneal apex in 11 normal and 2 keratoconus human donor eyes was imaged with high-frequency ultrasound during whole globe inflation from 5 to 30 mmHg...
October 2021: Experimental Biology and Medicine
https://read.qxmd.com/read/33384887/heartbeat-induced-corneal-axial-displacement-and-strain-measured-by-high-frequency-ultrasound-elastography-in-human-volunteers
#5
JOURNAL ARTICLE
Sunny Kwok, Keyton Clayson, Nicholas Hazen, Xueliang Pan, Yanhui Ma, Andrew J Hendershot, Jun Liu
Purpose: The purpose of this study was to establish in vivo data acquisition and processing protocols for repeatable measurements of heartbeat-induced corneal displacements and strains in human eyes, using a high-frequency ultrasound elastography method, termed ocular pulse elastography (OPE). Methods: Twenty-four volunteers with no known ocular diseases were recruited for this study. Intraocular pressure (IOP) and ocular pulse amplitude (OPA) were measured using a PASCAL Dynamic Contour Tonometer (DCT)...
December 2020: Translational Vision Science & Technology
https://read.qxmd.com/read/33162997/efficient-sequencing-assembly-and-annotation-of-human-kir-haplotypes
#6
JOURNAL ARTICLE
David Roe, Jonathan Williams, Keyton Ivery, Jenny Brouckaert, Nick Downey, Chad Locklear, Rui Kuang, Martin Maiers
The homology, recombination, variation, and repetitive elements in the natural killer-cell immunoglobulin-like receptor (KIR) region has made full haplotype DNA interpretation impossible in a high-throughput workflow. Here, we present a new approach using long-read sequencing to efficiently capture, sequence, and assemble diploid human KIR haplotypes. Probes were designed to capture KIR fragments efficiently by leveraging the repeating homology of the region. IDT xGen® Lockdown probes were used to capture 2-8 kb of sheared DNA fragments followed by sequencing on a PacBio Sequel...
2020: Frontiers in Immunology
https://read.qxmd.com/read/32861767/iop-induced-regional-displacements-in-the-optic-nerve-head-and-correlation-with-peripapillary-sclera-thickness
#7
JOURNAL ARTICLE
Yanhui Ma, Sunny Kwok, Jiajun Sun, Xueliang Pan, Elias Pavlatos, Keyton Clayson, Nicholas Hazen, Jun Liu
Mechanical insult induced by intraocular pressure (IOP) is likely a driving force in the disease process of glaucoma. This study aimed to evaluate regional displacements in human optic nerve head (ONH) and peripapillary tissue (PPT) in response to acute IOP elevations, and their correlations with morphological characteristics of the posterior eye. Cross-sectional (2D) images of the ONH and PPT in 14 globes of 14 human donors were acquired with high-frequency ultrasound during whole globe inflation from 5 to 30 mm Hg...
November 2020: Experimental Eye Research
https://read.qxmd.com/read/32558731/mechanical-stability-of-cryopreserved-split-thickness-tectonic-corneal-grafts
#8
JOURNAL ARTICLE
Joel R Palko, Yanhui Ma, Xueliang Pan, James Liu, Catherine Reppa, Maxwell W Dixon, Keyton Clayson, Anthony Lubniewski, Jun Liu
PURPOSE: To evaluate the influence of cryopreservation on the pressure-strain relationship of microkeratome dissected anterior stromal grafts (ASGs). METHODS: Partial thickness ASGs were created from 7 pairs of human corneas and randomized to immediate grafting or grafting after 3 months of cryopreservation at -80°C into a whole globe ex vivo corneal perforation model. High frequency ultrasound speckle tracking was used to calculate the cross-sectional axial and lateral strains in each graft at increasing intraocular pressure (IOP) from 5 to 30 mm Hg...
September 2020: Cornea
https://read.qxmd.com/read/32028758/3d-printing-latex-a-route-to-complex-geometries-of-high-molecular-weight-polymers
#9
JOURNAL ARTICLE
Philip J Scott, Viswanath Meenakshisundaram, Maruti Hegde, Christopher Kasprzak, Christopher Winkler, Keyton Feller, Christopher Bryant Williams, Timothy E Long
Vat photopolymerization (VP) additive manufacturing fabricates intricate geometries with excellent resolution; however, high molecular weight polymers are not amenable to VP due to concomitant high solution and melt viscosities. Thus, a challenging paradox arises between printability and mechanical performance. This report describes concurrent photopolymer and VP system design to navigate this paradox with the unprecedented use of polymeric colloids (latexes) that effectively decouple the dependency of viscosity on molecular weight...
February 6, 2020: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/31804232/hacking-teamwork-in-health-care-addressing-adverse-effects-of-ad-hoc-team-composition-in-critical-care-medicine
#10
JOURNAL ARTICLE
Poppy L McLeod, Quinn W Cunningham, Deborah DiazGranados, Gabi Dodoiu, Seth Kaplan, Joann Keyton, Nicole Larson, Chelsea LeNoble, Stephan U Marsch, Thomas A O'Neill, Sarah Henrickson Parker, Norbert K Semmer, Marissa Shuffler, Lillian Su, Franziska Tschan, Mary Waller, Yumei Wang
BACKGROUND: The continued need for improved teamwork in all areas of health care is widely recognized. The present article reports on the application of a hackathon to the teamwork problems specifically associated with ad hoc team formation in rapid response teams. PURPOSES: Hackathons-problem-solving events pioneered in computer science-are on the rise in health care management. The focus of these events tends to be on medical technologies, however, with calls for improvements in management practices as general recommendations...
October 2021: Health Care Management Review
https://read.qxmd.com/read/31750882/3d-biomechanical-response-of-the-optic-nerve-head-initial-results-from-porcine-globe-inflation-using-high-frequency-ultrasound-elastography
#11
JOURNAL ARTICLE
Yanhui Ma, Elias Pavlatos, Keyton Clayson, Sunny Kwok, Xueliang Pan, Jun Liu
Characterization of the biomechanical behavior of the optic nerve head (ONH) in response to intraocular pressure (IOP) elevation is important for understanding glaucoma susceptibility. In this study, we aimed to develop and validate a 3D ultrasound elastographic technique to obtain mapping and visualization of the 3D distributive displacements and strains of the ONH and surrounding peripapillary tissue (PPT) during whole globe inflation from 15 to 30 mmHg. 3D scans of the posterior eye around the ONH were acquired through full tissue thickness with a high frequency ultrasound system (50 MHz)...
November 1, 2019: Journal of Biomechanical Engineering
https://read.qxmd.com/read/31474157/corneal-hydration-control-during-ex-vivo-experimentation-using-poloxamers
#12
JOURNAL ARTICLE
Keyton Clayson, Thomas Sandwisch, Yanhui Ma, Elias Pavlatos, Xueliang Pan, Jun Liu
Purpose : The purpose of this study was to develop an effective treatment method using poloxamers to restore and maintain physiological hydration in postmortem porcine and human corneas during ex vivo experimentation, and to compare corneal inflation response with or without treatment. Materials and Methods : Corneal buttons obtained from whole globes (n=30 porcine, n=8 human) were treated with various concentrations of poloxamer 188 (P188, a synthetic macromolecule surfactant) for 24 hrs to identify the concentration that would return the cornea to near-physiological hydration (i...
August 31, 2019: Current Eye Research
https://read.qxmd.com/read/30835783/mechanical-deformation-of-human-optic-nerve-head-and-peripapillary-tissue-in-response-to-acute-iop-elevation
#13
JOURNAL ARTICLE
Yanhui Ma, Elias Pavlatos, Keyton Clayson, Xueliang Pan, Sunny Kwok, Thomas Sandwisch, Jun Liu
Purpose: To measure the deformation of the human optic nerve head (ONH) and peripapillary tissue (PPT) in response to acute intraocular pressure (IOP) elevation. Methods: The ONH and PPT of 14 human donor globes were imaged with high-frequency ultrasonography during inflation testing from 5 to 30 mm Hg. A correlation-based speckle tracking algorithm was used to compute tissue displacements, and the through-thickness, in-plane, and shear strains were calculated by using least-squares strain estimation methods...
March 1, 2019: Investigative Ophthalmology & Visual Science
https://read.qxmd.com/read/30046819/regional-deformation-of-the-optic-nerve-head-and-peripapillary-sclera-during-iop-elevation
#14
JOURNAL ARTICLE
Elias Pavlatos, Yanhui Ma, Keyton Clayson, Xueliang Pan, Jun Liu
Purpose: To measure the deformation of the porcine optic nerve head (ONH) and peripapillary sclera (PPS) in response to intraocular pressure (IOP) elevation. Methods: High-frequency ultrasound was used to image the ONH and PPS of 12 porcine eyes during ex vivo inflation testing from 5 to 30 mm Hg. A speckle tracking algorithm was used to compute tissue displacements in the anterior-posterior direction and expansion of the scleral canal. Through-thickness, in-plane, and shear strains were calculated within the ONH...
July 2, 2018: Investigative Ophthalmology & Visual Science
https://read.qxmd.com/read/29408793/imaging-corneal-biomechanical-responses-to-ocular-pulse-using-high-frequency-ultrasound
#15
JOURNAL ARTICLE
Elias Pavlatos, Hong Chen, Keyton Clayson, Xueliang Pan, Jun Liu
Imaging corneal biomechanical changes or abnormalities is important for better clinical diagnosis and treatment of corneal diseases. We propose a novel ultrasound-based method, called ocular pulse elastography (OPE), to image corneal deformation during the naturally occurring ocular pulse. Experiments on animal and human donor eyes, as well as synthetic radiofrequency (RF) data, were used to evaluate the efficacy of the OPE method. Using very high-frequency ultrasound (center frequency = 55 MHz), correlation-based speckle tracking yielded an accuracy of less than 10% error for axial tissue displacements of or above...
February 2018: IEEE Transactions on Medical Imaging
https://read.qxmd.com/read/29399203/3d-characterization-of-corneal-deformation-using-ultrasound-speckle-tracking
#16
JOURNAL ARTICLE
Keyton Clayson, Elias Pavlatos, Yanhui Ma, Jun Liu
The three-dimensional (3D) mechanical response of the cornea to intraocular pressure (IOP) elevation has not been previously reported. In this study, we use an ultrasound speckle tracking technique to measure the 3D displacements and strains within the central 5.5 mm of porcine corneas during the whole globe inflation. Inflation tests were performed on dextran-treated corneas (treated with a 10% dextran solution) and untreated corneas. The dextran-treated corneas showed an inflation response expected of a thin spherical shell, with through-thickness thinning and in-plane stretch, although the strain magnitudes exhibited a heterogeneous spatial distribution from the central to more peripheral cornea...
November 2017: Journal of Innovative Optical Health Sciences
https://read.qxmd.com/read/29249891/new-frontiers-in-analyzing-dynamic-group-interactions-bridging-social-and-computer-science
#17
JOURNAL ARTICLE
Nale Lehmann-Willenbrock, Hayley Hung, Joann Keyton
This special issue on advancing interdisciplinary collaboration between computer scientists and social scientists documents the joint results of the international Lorentz workshop, "Interdisciplinary Insights into Group and Team Dynamics," which took place in Leiden, The Netherlands, July 2016. An equal number of scholars from social and computer science participated in the workshop and contributed to the papers included in this special issue. In this introduction, we first identify interaction dynamics as the core of group and team models and review how scholars in social and computer science have typically approached behavioral interactions in groups and teams...
October 2017: Small Group Research
https://read.qxmd.com/read/28864177/corneoscleral-stiffening-increases-iop-spike-magnitudes-during-rapid-microvolumetric-change-in-the-eye
#18
JOURNAL ARTICLE
Keyton Clayson, Xueliang Pan, Elias Pavlatos, Ryan Short, Hugh Morris, Richard T Hart, Jun Liu
Factors governing the steady-state IOP have been extensively studied; however, the dynamic aspects of IOP are less understood. Clinical studies have suggested that intraocular pressure (IOP) fluctuation may be associated with glaucoma risk. This study aims to investigate how stiffening of corneoscleral biomechanical properties affects IOP spikes induced by rapid microvolumetric change. Porcine eyes (n = 25 in total) were subjected to volumetric infusions before and after external treatment of a circular area (11 mm diameter) in either the central cornea or posterior sclera...
December 2017: Experimental Eye Research
https://read.qxmd.com/read/27624944/facilitating-teamwork-in-adolescent-and-young-adult-oncology
#19
JOURNAL ARTICLE
Rebecca H Johnson, Catherine Fiona Macpherson, Ashley W Smith, Rebecca G Block, Joann Keyton
A case of a young adult patient in the days immediately after a cancer diagnosis illustrates the critical importance of three interrelated core coordinating mechanisms-closed-loop communication, shared mental models, and mutual trust-of teamwork in an adolescent and young adult multidisciplinary oncology team. The case illustrates both the opportunities to increase team member coordination and the problems that can occur when coordination breaks down. A model for teamwork is presented, which highlights the relationships among these coordinating mechanisms and demonstrates how balance among them works to optimize team function and patient care...
November 2016: Journal of Oncology Practice
https://read.qxmd.com/read/27087051/solid-state-nmr-and-dft-predictions-of-differences-in-cooh-hydrogen-bonding-in-odd-and-even-numbered-n-alkyl-fatty-acids
#20
JOURNAL ARTICLE
Jacob Powell, Keyton Kalakewich, Fernando J Uribe-Romo, James K Harper
For nearly 140 years n-alkyl monocarboxylic acids have been known to exhibit unusual non-monotonic melting between odd and even numbered acids. This behavior has been rationalized in terms of packing density at the hydrocarbon tails, with COOH hydrogen bonding considered to be invariant among different acids. A recent ambiguity involving the COOH conformation between two crystal structures of lauric acid suggests that COOH structure and hydrogen bonding may play a role in these differences. Here, the two conflicting lauric acid crystal structures are further refined using lattice-including DFT refinement methods...
May 14, 2016: Physical Chemistry Chemical Physics: PCCP
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