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https://www.readbyqxmd.com/read/29458004/real-time-analysis-of-cleavage-and-religation-activity-of-human-topoisomerase-1-based-on-ternary-fluorescence-resonance-energy-transfer-dna-substrate
#1
Zhenxing Wang, Hui Ouyang, Cinzia Tesauro, Alessio Ottaviani, Yong He, Paola Fiorani, Hui Xie, Alessandro Desideri, Zhifeng Fu
Human topoisomerase 1B is a ubiquitous and essential enzyme involved in relaxing the topological state of supercoiled DNA to allow the progression of fundamental DNA metabolism. Its enzymatic catalytic cycle consists of cleavage and religation reaction. A ternary fluorescence resonance energy transfer biosensor based on a suicide DNA substrate conjugated with three fluorophores has been developed to monitor both cleavage and religation Topoisomerase I catalytic function. The presence of fluorophores does not alter the specificity of the enzyme catalysis on the DNA substrate...
February 16, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29457984/cardio-oncology-the-role-of-advanced-echocardiography-in-cancer-patients
#2
Lucia Venneri, Giacomo Zoppellaro, Rajdeep S Khattar
Cardio-oncology is a rapidly growing field aimed at improving the quality of care of cancer patients by preventing and monitoring cardiovascular complications resulting from cancer treatment. Cardiac imaging, and in particular, transthoracic echocardiography, plays an essential role in the baseline assessment and serial follow-up of cardio-oncology patients. Areas covered: This review article discusses the role of cardiac imaging with a focus on advanced echocardiography for the detection and management of cancer therapy related cardiovascular complications, in particular, left ventricular dysfunction and heart failure...
February 19, 2018: Expert Review of Cardiovascular Therapy
https://www.readbyqxmd.com/read/29457774/a-review-of-advances-in-pixel-detectors-for-experiments-with-high-rate-and-radiation
#3
Maurice Garcia-Sciveres, N Wermes
The Large Hadron Collider (LHC) experiments ATLAS and CMS have established hybrid pixel detectors as the instrument of choice for particle tracking and vertexing in high rate and radiation environments, as they operate close to the LHC interaction points. With the High Luminosity-LHC upgrade now in sight, for which the tracking detectors will be completely replaced, new generations of pixel detectors are being devised. They have to address enormous challenges in terms of data throughput and radiation levels, ionizing and non-ionizing, that harm the sensing and readout parts of pixel detectors alike...
February 19, 2018: Reports on Progress in Physics
https://www.readbyqxmd.com/read/29457704/comparability-and-repeatability-of-three-commonly-used-methods-for-measuring-endurance-capacity
#4
James Baxter-Gilbert, Max Mühlenhaupt, Martin J Whiting
Measures of endurance (time to exhaustion) have been used to address a wide range of questions in ecomorphological and physiological research, as well as being used as a proxy for survival and fitness. Swimming, stationary (circular) track running, and treadmill running are all commonly used methods for measuring endurance. Despite the use of these methods across a broad range of taxa, how comparable these methods are to one another, and whether they are biologically relevant, is rarely examined. We used Australian water dragons (Intellagama lesueurii), a species that is morphologically adept at climbing, swimming, and running, to compare these three methods of endurance and examined if there is repeatability within and between trial methods...
February 19, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29457264/comparison-of-left-atrial-size-and-function-in-hypertrophic-cardiomyopathy-and-in-fabry-disease-with-left-ventricular-hypertrophy
#5
María Cristina Saccheri, Tomás Francisco Cianciulli, Wilde Challapa Licidio, Jorge A Lax, Martín A Beck, Luis A Morita, Juan A Gagliardi
BACKGROUND: Fabry disease (FD) and hypertrophic cardiomyopathy (HCM) are two diseases with a different pathophysiology, both cause left ventricular hypertrophy (LVH) and myocardial fibrosis. Although remodeling and systolic dysfunction of the left atrium (LA) are associated with atrial fibrillation and stroke in HCM, changes in the size and function of the LA have not been well studied in FD with LVH. METHODS: The following groups were studied prospectively, and their respective findings compared: 19 patients with non-obstructive HCM (Group I), 20 patients with a diagnosis of Fabry cardiomyopathy (Group II), and 20 normal subjects matched for sex and age (Group III)...
February 19, 2018: Echocardiography
https://www.readbyqxmd.com/read/29457135/oceanic-crustal-carbon-cycle-drives-26-million-year-atmospheric-carbon-dioxide-periodicities
#6
R Dietmar Müller, Adriana Dutkiewicz
Atmospheric carbon dioxide (CO2 ) data for the last 420 million years (My) show long-term fluctuations related to supercontinent cycles as well as shorter cycles at 26 to 32 My whose origin is unknown. Periodicities of 26 to 30 My occur in diverse geological phenomena including mass extinctions, flood basalt volcanism, ocean anoxic events, deposition of massive evaporites, sequence boundaries, and orogenic events and have previously been linked to an extraterrestrial mechanism. The vast oceanic crustal carbon reservoir is an alternative potential driving force of climate fluctuations at these time scales, with hydrothermal crustal carbon uptake occurring mostly in young crust with a strong dependence on ocean bottom water temperature...
February 2018: Science Advances
https://www.readbyqxmd.com/read/29457134/trophic-signatures-of-seabirds-suggest-shifts-in-oceanic-ecosystems
#7
Tyler O Gagne, K David Hyrenbach, Molly E Hagemann, Kyle S Van Houtan
Pelagic ecosystems are dynamic ocean regions whose immense natural capital is affected by climate change, pollution, and commercial fisheries. Trophic level-based indicators derived from fishery catch data may reveal the food web status of these systems, but the utility of these metrics has been debated because of targeting bias in fisheries catch. We analyze a unique, fishery-independent data set of North Pacific seabird tissues to inform ecosystem trends over 13 decades (1890s to 2010s). Trophic position declined broadly in five of eight species sampled, indicating a long-term shift from higher-trophic level to lower-trophic level prey...
February 2018: Science Advances
https://www.readbyqxmd.com/read/29456979/quercetin-prevents-body-weight-loss-due-to-the-using-of-superparamagnetic-iron-oxide-nanoparticles-in-rat
#8
Rezvan Enteshari Najafabadi, Nasrin Kazemipour, Abolghasem Esmaeili, Siamak Beheshti, Saeed Nazifi
Background: Superparamagnetic iron oxide nanoparticles (SPION) have been largely considered for numerous applications in biomedicine such as magnetic resonance imaging, hyperthermia, cell tracking, anticancer treatment, and targeted delivery of drugs or genes. However, they may have side effects such body weight loss. Quercetin (QT), a strong antioxidant and free radical scavenger and a natural flavonoid, has a wide range of biological and therapeutic effects. In this study, the effect of QT on prevention of weight loss due to the using of SPION has been investigated...
2018: Advanced Biomedical Research
https://www.readbyqxmd.com/read/29456279/uncertainty-footprint-visualization-of-nonuniform-behavior-of-iterative-algorithms-applied-to-4d-cell-tracking
#9
Y Wan, C Hansen
Research on microscopy data from developing biological samples usually requires tracking individual cells over time. When cells are three-dimensionally and densely packed in a time-dependent scan of volumes, tracking results can become unreliable and uncertain. Not only are cell segmentation results often inaccurate to start with, but it also lacks a simple method to evaluate the tracking outcome. Previous cell tracking methods have been validated against benchmark data from real scans or artificial data, whose ground truth results are established by manual work or simulation...
June 2017: Computer Graphics Forum: Journal of the European Association for Computer Graphics
https://www.readbyqxmd.com/read/29456277/differential-attention-to-faces-in-infant-siblings-of-children-with-autism-spectrum-disorder-and-associations-with-later-social-and-language-ability
#10
Jennifer B Wagner, Rhiannon J Luyster, Hana Moustapha, Helen Tager-Flusberg, Charles A Nelson
A growing body of literature has begun to explore social attention in infant siblings of children with autism spectrum disorder (ASD) with hopes of identifying early differences that are associated with later ASD or other aspects of development. The present study used eye-tracking to familiar (mother) and unfamiliar (stranger) faces in two groups of 6-month-old infants: infants with no family history of ASD (low-risk controls; LRC), and infants at high risk for ASD (HRA), by virtue of having an older sibling with ASD...
2018: International Journal of Behavioral Development
https://www.readbyqxmd.com/read/29456262/mixed-analytical-stochastic-simulation-method-for-the-recovery-of-a-brownian-gradient-source-from-probability-fluxes-to-small-windows
#11
U Dobramysl, D Holcman
Is it possible to recover the position of a source from the steady-state fluxes of Brownian particles to small absorbing windows located on the boundary of a domain? To address this question, we develop a numerical procedure to avoid tracking Brownian trajectories in the entire infinite space. Instead, we generate particles near the absorbing windows, computed from the analytical expression of the exit probability. When the Brownian particles are generated by a steady-state gradient at a single point, we compute asymptotically the fluxes to small absorbing holes distributed on the boundary of half-space and on a disk in two dimensions, which agree with stochastic simulations...
February 15, 2018: Journal of Computational Physics
https://www.readbyqxmd.com/read/29456171/a-magnetic-resonance-imaging-framework-for-quantifying-intervertebral-disc-deformation-in-vivo-reliability-and-application-to-diurnal-variations-in-lumbar-disc-shape
#12
John T Martin, Alexander B Oldweiler, Charles E Spritzer, Brian J Soher, Melissa M Erickson, Adam P Goode, Louis E DeFrate
Low back pain is a significant socioeconomic burden in the United States and lumbar intervertebral disc degeneration is frequently implicated as a cause. The discs play an important mechanical role in the spine, yet the relationship between disc function and back pain is poorly defined. The objective of this work was to develop a technique using magnetic resonance imaging (MRI) and three-dimensional modeling to measure in vivo disc deformations. Using this method, we found that disc geometry was measurable with precision less than the in-plane dimensions of a voxel (≈100 µm, 10% of the MRI pixel size)...
February 9, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29456069/arthroscopic-superior-capsular-reconstruction-with-acellular-dermal-allograft-for-the-treatment-of-massive-irreparable-rotator-cuff-tears-short-term-clinical-outcomes-and-the-radiographic-parameter-of-superior-capsular-distance
#13
William T Pennington, Brian A Bartz, Joann M Pauli, Carol E Walker, William Schmidt
PURPOSE: This outcome analysis presents 88 consecutive shoulders presenting with irreparable rotator cuff tears that we treated with arthroscopic superior capsular reconstruction (SCR) using an acellular dermal allograft. We also present the concept of superior capsular distance to quantitatively measure the decreased distance present upon restoration of superior capsular integrity. METHODS: A retrospective review was conducted of patients treated with arthroscopic SCR with a minimum 12-month follow-up...
February 15, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29456064/triple-loaded-suture-anchors-versus-a-knotless-rip-stop-construct-in-a-single-row-rotator-cuff-repair-model
#14
Matthew P Noyes, Evan Lederman, Christopher R Adams, Patrick J Denard
PURPOSE: To compare the biomechanical properties of single-row repair with triple-loaded (TL) anchor repair versus a knotless rip stop (KRS) repair in a rotator cuff repair model. METHODS: Rotator cuff tears were created in 8 cadaveric matched-pair specimens and repaired with a TL anchor or KRS construct. In the TL construct, anchors were placed in the greater tuberosity and then all suture limbs were passed through the rotator cuff as simple sutures and tied. In the KRS construct, a 2-mm suture tape was passed through the tendon in an inverted mattress fashion, and a free suture was passed medial to the suture tape to create a rip-stop...
February 15, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29455856/towards-the-development-of-a-modeling-framework-to-track-nitrogen-export-from-lowland-artificial-watersheds-polders
#15
Jiacong Huang, George B Arhonditsis, Junfeng Gao, Dong-Kyun Kim, Feifei Dong
Excess nitrogen (N) export from lowland artificial watersheds (polders) is often assumed to be a major contributor to the cultural eutrophication of downstream aquatic ecosystems. However, the complex transport processes characterizing lowland areas pose significant challenges in accurately quantifying their actual role. In this study, we developed a dynamic model to track N sources and transport pathways in lowland polders. The model is able to accommodate all the unique characteristics of polder dynamics, including artificial drainage, and interactions among surface water, groundwater and soil water...
April 15, 2018: Water Research
https://www.readbyqxmd.com/read/29455737/foreclosure-migration-and-neighborhood-outcomes-moving-toward-segregation-and-disadvantage
#16
Matthew Hall, Kyle Crowder, Amy Spring, Ryan Gabriel
The US housing crisis during the late 2000s was arguably the most devastating residential disaster of the last century, sending millions of families into foreclosure and destroying billions in household wealth. An understudied aspect of the crisis was the spike in local migration that followed the foreclosure surge. In this paper, we assess the residential consequences of these moves, by exploring how foreclosure-induced migration affected the racial and socioeconomic composition of affected families' neighborhoods...
February 2018: Social Science Research
https://www.readbyqxmd.com/read/29455722/computer-assisted-motivational-interviewing-intervention-to-facilitate-teen-pregnancy-prevention-and-fitness-behavior-changes-a-randomized-trial-for-young-men
#17
David L Bell, Samantha Garbers, Marina Catallozzi, R Stanley Hum, Meredith Nechitilo, Ian W McKeague, Emilia H Koumans, L Duane House, Susan L Rosenthal, Melanie A Gold
PURPOSE: Despite recent declines, teen unintended pregnancy and sexually transmitted infections in the United States remain at levels higher than comparable nations. Initiatives to prevent teen pregnancy have focused primarily on female adolescents; how to effectively engage young men to reduce their risk of fathering a teen pregnancy has not been well studied. We proposed to adapt an innovative computer-assisted motivational interviewing (CAMI) intervention, originally designed and tested with young women, for use with young men, aged 15-24 years, to reduce their risk of fathering a teen pregnancy...
March 2018: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
https://www.readbyqxmd.com/read/29455467/predicting-reintroduction-outcomes-for-highly-vulnerable-species-that-do-not-currently-coexist-with-their-key-threats
#18
Elizabeth H Parlato, Doug P Armstrong
Predicting reintroduction outcomes before populations are released is inherently challenging. It becomes even more difficult when the species being considered for reintroduction no longer co-exists with the key threats limiting its distribution. However, data from other species facing the same threats can be used to make predictions under these circumstances. We present an integrated Bayesian modelling approach for predicting growth of a reintroduced population at a range of predator densities when no data are available for the species in the presence of that predator...
February 17, 2018: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/29455260/performance-evaluation-of-state-of-the-art-local-feature-detectors-and-descriptors-in-the-context-of-longitudinal-registration-of-retinal-images
#19
Sajib K Saha, Di Xiao, Shaun Frost, Yogesan Kanagasingam
In this paper we systematically evaluate the performance of several state-of-the-art local feature detectors and descriptors in the context of longitudinal registration of retinal images. Longitudinal (temporal) registration facilitates to track the changes in the retina that has happened over time. A wide number of local feature detectors and descriptors exist and many of them have already applied for retinal image registration, however, no comparative evaluation has been made so far to analyse their respective performance...
February 17, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29455164/surgical-efficiency-in-femtosecond-laser-cataract-surgery-compared-with-phacoemulsification-cataract-surgery-a-case-control-study
#20
Alexander C Day, Phillip R Smith, Hongying Lilian Tang, Francesco Aiello, Badrul Hussain, Vincenzo Maurino, John Marshall, George M Saleh
OBJECTIVES: To investigate differences in surgical time, the distance the surgical instrument travelled and number of movements required to complete manual phacoemulsification cataract surgery versus femtosecond laser cataract surgery. DESIGN: Non-randomised comparative case series. SETTING: Single surgery site, Moorfields Eye Hospital, UK. PARTICIPANTS: 40 cataract surgeries of 40 patients. INTERVENTIONS: Laser-assisted and manual phacoemulsification cataract surgery...
February 17, 2018: BMJ Open
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