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Feature Tracking

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https://www.readbyqxmd.com/read/29232511/quadratic-response-properties-from-tddft-trials-and-tribulations
#1
Shane M Parker, Dmitrij Rappoport, Filipp Furche
We report on the efficient Turbomole implementation of quadratic response properties within the time-dependent density functional theory (TDDFT) context that includes the static and dynamic dipole hyperpolarizability, ground-to-excited-state two-photon absorption amplitudes (through a single residue) and state-to-state one-photon absorption amplitudes (through a double residue). Our implementation makes full use of arbitrary (including non-Abelian) point-group symmetry as well as permutational symmetry and enables the calculation of nonlinear properties with hybrid density functionals for molecules with hundreds of atoms and thousands of basis functions at a cost that is a fixed multiple of the cost of the corresponding linear properties...
December 12, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29229706/causal-evidence-for-learning-dependent-frontal-lobe-contributions-to-cognitive-control
#2
Paul S Muhle-Karbe, Jiefeng Jiang, Tobias Egner
The lateral prefrontal cortex (LPFC) plays a central role in the prioritization of sensory input based on task-relevance. Such top-down control of perception is of fundamental importance in goal-directed behavior, but can also be costly when deployed excessively, necessitating a mechanism that regulates control engagement to align it with changing environmental demands. We have recently introduced the "flexible control model," which explains this regulation as resulting from a self-adjusting reinforcement-learning mechanism that infers latent statistical structure in dynamic task environments to predict forthcoming states...
December 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29227821/scan-rescan-reproducibility-of-ventricular-and-atrial-mri-feature-tracking-strain
#3
Jérôme Lamy, Gilles Soulat, Morgane Evin, Adrian Huber, Alain de Cesare, Alain Giron, Benoit Diebold, Alban Redheuil, Elie Mousseaux, Nadjia Kachenoura
BACKGROUND: A feature tracking (FT) was designed to simultaneously extract myocardial strains in main cardiac chambers from cine MRI images. Its inter-observer and scan-rescan reproducibility was assessed and sample sizes required to detect predefined longitudinal changes in strain values were provided. METHOD: FT was applied on left (LV) and right (RV) ventricles as well as left atrium (LA) of 21 individuals (66 ± 10 years) who underwent 2 MRIs 2 weeks apart...
November 24, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29226213/reference-ranges-and-reproducibility-studies-for-right-heart-myocardial-deformation-by-feature-tracking-cardiovascular-magnetic-resonance-imaging
#4
Boyang Liu, Ahmed M Dardeer, William E Moody, Nicola C Edwards, Lucy E Hudsmith, Richard P Steeds
Feature tracking of the right heart on cardiac MRI is a novel and promising technique for the measurement of right heart myocardial strain. We present here the reference ranges for right ventricular longitudinal strain and strain rate, as well as peak strain of the right atrium within a cohort of 100 healthy individuals recruited from the UK. We present data on the reproducibility of these feature tracking techniques and explore relationship between strain and baseline demographic parameters.
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29225367/the-impact-of-organic-additives-on-copper-trench-microstructure
#5
James B Marro, Chukwudi A Okoro, Yaw S Obeng, Kathleen C Richardson
Organic additives are typically used in the pulse electrodeposition of copper (Cu) to prevent void formation during the filling of high aspect ratio features. In this work, the role of bath chemistry as modified by organic additives was investigated for its effects on Cu trench microstructure. Polyethylene glycol (PEG), bis(3-sulfopropyl) disulfide (SPS), and Janus green b (JGB) concentrations were varied in the Cu electrodeposition bath. Results indicated a correlation between the JGB/SPS ratio and the surface roughness and residual stresses in the Cu...
2017: Journal of the Electrochemical Society
https://www.readbyqxmd.com/read/29221067/robust-6-dof-motion-sensing-for-an-arbitrary-rigid-body-by-multi-view-laser-doppler-measurements
#6
Yunpu Hu, Leo Miyashita, Yoshihiro Watanabe, Masatoshi Ishikawa
We propose a novel method for the robust, non-contact, and six degrees of freedom (6-DOF) motion sensing of an arbitrary rigid body using multi-view laser Doppler measurements. The proposed method reconstructs the 6-DOF motion from fragmentary velocities on the surface of the target. It is unique compared to conventional contact-less motion sensing methods since it is robust against lack-of-feature objects and environments. By discussing the formulation of motion reconstruction by fragmentary velocities, we show that at least three viewpoints are essential for 6-DOF motion reconstruction...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29219655/track-to-the-future-historical-perspective-on-the-importance-of-radiation-track-structure-and-dna-as-a-radiobiological-target
#7
Mark A Hill
PURPOSE: Understanding the mechanisms behind induced biological response following exposure to ionizing radiation is not only important in assessing the risk associated with human exposure, but potentially can help identify ways of improving the efficacy of radiotherapy. Over the decades, there has been much discussion on what is the key biological target for radiation action and its associated size. It was already known in the 1930s that microscopic features of radiation significantly influenced biological outcomes...
December 8, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29215082/the-myokinetic-control-interface-tracking-implanted-magnets-as-a-means-for-prosthetic-control
#8
S Tarantino, F Clemente, D Barone, M Controzzi, C Cipriani
Upper limb amputation deprives individuals of their innate ability to manipulate objects. Such disability can be restored with a robotic prosthesis linked to the brain by a human-machine interface (HMI) capable of decoding voluntary intentions, and sending motor commands to the prosthesis. Clinical or research HMIs rely on the interpretation of electrophysiological signals recorded from the muscles. However, the quest for an HMI that allows for arbitrary and physiologically appropriate control of dexterous prostheses, is far from being completed...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29214207/what-is-the-role-of-the-film-viewer-the-effects-of-narrative-comprehension-and-viewing-task-on-gaze-control-in-film
#9
John P Hutson, Tim J Smith, Joseph P Magliano, Lester C Loschky
Film is ubiquitous, but the processes that guide viewers' attention while viewing film narratives are poorly understood. In fact, many film theorists and practitioners disagree on whether the film stimulus (bottom-up) or the viewer (top-down) is more important in determining how we watch movies. Reading research has shown a strong connection between eye movements and comprehension, and scene perception studies have shown strong effects of viewing tasks on eye movements, but such idiosyncratic top-down control of gaze in film would be anathema to the universal control mainstream filmmakers typically aim for...
2017: Cognitive Research: Principles and Implications
https://www.readbyqxmd.com/read/29209744/preserved-myocardial-deformation-after-successful-coarctation-repair-a-cmr-feature-tracking-study
#10
Elles J Dijkema, Martijn G Slieker, Johannes M P J Breur, Tim Leiner, Heynric B Grotenhuis
Arterial vasculopathy and residual aortic obstruction can lead to left ventricular (LV) dysfunction in patients with coarctation of the aorta (CoA) related to adverse ventriculo-arterial coupling. This study aimed to investigate potential differences in LV myocardial deformation indices between repaired CoA patients and healthy controls. Twenty-two CoA patients (age 30 ± 10.6 years) after surgical repair (n = 12) or balloon angioplasty (BA) (n = 10) without residual stenosis, between 3 months and 16 years of age with > 10 years follow-up were compared to 22 healthy age- and gender-matched controls (age 30 ± 3...
December 5, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29209242/patterns-of-eye-movements-when-observers-judge-female-facial-attractiveness
#11
Yan Zhang, Xiaoying Wang, Juan Wang, Lili Zhang, Yu Xiang
The purpose of the present study is to explore the fixed model for the explicit judgments of attractiveness and infer which features are important to judge the facial attractiveness. Behavioral studies on the perceptual cues for female facial attractiveness implied three potentially important features: averageness, symmetry, and sexual dimorphy. However, these studies did not explained which regions of facial images influence the judgments of attractiveness. Therefore, the present research recorded the eye movements of 24 male participants and 19 female participants as they rated a series of 30 photographs of female facial attractiveness...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29205626/feasibility-and-reproducibility-of-feature-tracking-based-strain-and-strain-rate-measures-of-the-left-ventricle-in-different-diseases-and-genders
#12
Alicia M Maceira, Luis Tuset-Sanchis, Miguel López-Garrido, Marta San Andres, M Pilar López-Lereu, Jose V Monmeneu, M Pilar García-González, Laura Higueras
BACKGROUND: The measurement of myocardial deformation by strain analysis is an evolving tool to quantify regional and global myocardial function. PURPOSE: To assess the feasibility and reproducibility of myocardial strain/strain rate measurements with magnetic resonance feature tracking (MR-FT) in healthy subjects and in patient groups. STUDY TYPE: Prospective study. POPULATION: Sixty patients (20 hypertensives with left ventricular (LV) hypertrophy (H); 20 nonischemic dilated cardiomyopathy (D); 20 ischemic heart disease (I); as well as 20 controls (C) were included, 10 men and 10 women in each group...
December 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29203414/complement-activation-in-vitro-and-reactogenicity-of-low-molecular-weight-dextran-coated-spions-in-the-pig-carpa-model-correlation-with-physicochemical-features-and-clinical-information
#13
Tamás Fülöp, Réka Nemes, Tamás Mészáros, Rudolf Urbanics, Robbert Jan Kok, Joshua A Jackman, Namjoon Cho, Gert Storm, János Szebeni
The unique magnetic properties of superparamagnetic iron oxide nanoparticles (SPIONs) have led to their increasing use in drug delivery and imaging applications. Some polymer-coated SPIONs, however, share with many other nanoparticles the potential of causing hypersensitivity reactions known as complement (C) activation-related pseudoallergy (CARPA). In order to explore the roles of iron core composition and particle surface coating in SPION-induced CARPA, we measured C activation by 6 different SPIONs in a human serum that is known to react to nanoparticles (NPs) with strong C activation...
December 1, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29196523/dna-replication-timing-alterations-identify-common-markers-between-distinct-progeroid-diseases
#14
Juan Carlos Rivera-Mulia, Romain Desprat, Claudia Trevilla-Garcia, Daniela Cornacchia, Hélène Schwerer, Takayo Sasaki, Jiao Sima, Tyler Fells, Lorenz Studer, Jean-Marc Lemaitre, David M Gilbert
Progeroid syndromes are rare genetic disorders that phenotypically resemble natural aging. Different causal mutations have been identified, but no molecular alterations have been identified that are in common to these diseases. DNA replication timing (RT) is a robust cell type-specific epigenetic feature highly conserved in the same cell types from different individuals but altered in disease. Here, we characterized DNA RT program alterations in Hutchinson-Gilford progeria syndrome (HGPS) and Rothmund-Thomson syndrome (RTS) patients compared with natural aging and cellular senescence...
December 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29194379/isolation-and-characterization-of-serum-extracellular-vesicles-evs-from-atlantic-salmon-infected-with-piscirickettsia-salmonis
#15
Leidy Lagos, Julia Tandberg, Alexander Kashulin-Bekkelund, Duncan J Colquhoun, Henning Sørum, Hanne C Winther-Larsen
Secretion of extracellular vesicles (EVs) is a common feature of both eukaryotic and prokaryotic cells. Isolated EVs have been shown to contain different types of molecules, including proteins and nucleic acids, and are reported to be key players in intercellular communication. Little is known, however, of EV secretion in fish, or the effect of infection on EV release and content. In the present study, EVs were isolated from the serum of healthy and Piscirickettsia salmonis infected Atlantic salmon in order to evaluate the effect of infection on EV secretion...
December 1, 2017: Proteomes
https://www.readbyqxmd.com/read/29193826/validation-of-eye-tracking-measures-of-social-attention-as-a-potential-biomarker-for-autism-clinical-trials
#16
Michael Murias, Samantha Major, Katherine Davlantis, Lauren Franz, Adrianne Harris, Benjamin Rardin, Maura Sabatos-DeVito, Geraldine Dawson
Social communication impairments are a core feature of autism spectrum disorder (ASD), and this class of symptoms is a target for treatments for the disorder. Measures of social attention, assessed via eye-gaze tracking (EGT), have been proposed as an early efficacy biomarker for clinical trials targeting social communication skills. EGT measures have been shown to differentiate children with ASD from typical children; however, there is less known about their relationships with social communication outcome measures that are typically used in ASD clinical trials...
November 29, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/29188403/maternal-acceptance-moderates-fear-ratings-and-avoidance-behavior-in-children
#17
Yaara Shimshoni, Wendy K Silverman, Simon P Byrne, Eli R Lebowitz
Avoidance is a hallmark feature of anxiety disorders, and avoidance-related impairment is often key to meeting diagnostic criteria. In children and adolescents with anxiety disorders, levels of avoidance vary considerably. Using a novel motion-tracking measure of avoidance behavior, we examined whether maternal acceptance, characterized by warm and accepting responses to child feelings and behaviors, moderates the association between fear of spiders and behavioral avoidance of spider stimuli in 103 clinically anxious children...
November 29, 2017: Child Psychiatry and Human Development
https://www.readbyqxmd.com/read/29188318/myocardial-strain-using-cardiac-mr-feature-tracking-and-speckle-tracking-echocardiography-in-duchenne-muscular-dystrophy-patients
#18
Bryan Siegel, Laura Olivieri, Heather Gordish-Dressman, Christopher F Spurney
Duchenne muscular dystrophy (DMD) is an inherited X-linked disorder with an incidence of 1 in 3500 male births, and cardiomyopathy is becoming the leading cause of death. While Cardiac MRI (CMR) and late gadolinium enhancement (LGE) are important tools in recognizing myocardial involvement, myocardial strain imaging may demonstrate early changes and allow patients to avoid gadolinium contrast. We performed CMR feature tracking (FT) and echo-based speckle tracking (STE) strain measures on DMD patients and age/sex matched controls who had received a CMR with contrast and transthoracic echocardiogram...
November 29, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29187619/photoreceptor-signalling-is-sufficient-to-explain-the-detectability-threshold-of-insect-aerial-pursuers
#19
Elisa Rigosi, Steven D Wiederman, David C O'Carroll
An essential biological task for many flying insects is the detection of small, moving targets, such as when pursuing prey or conspecifics. Neural pathways underlying such 'target-detecting' behaviours have been investigated for their sensitivity and tuning properties (size, velocity). However, which stage of neuronal processing limits target detection is not yet known. Here, we investigated several skilled, aerial pursuers (males of four insect species), measuring the target-detection limit (signal-to-noise ratio) of light-adapted photoreceptors...
December 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29185579/subnanometer-structure-and-function-from-ion-beams-through-complex-fluidics-to-fluorescent-particles
#20
Kuo-Tang Liao, Joshua Schumacher, Henri J Lezec, Samuel M Stavis
The vertical dimensions of complex nanostructures determine the functions of diverse nanotechnologies. In this paper, we investigate the unknown limits of such structure-function relationships at subnanometer scales. We begin with a quantitative evaluation of measurement uncertainty from atomic force microscopy, which propagates through our investigation from ion beam fabrication to fluorescent particle characterization. We use a focused beam of gallium ions to subtractively pattern silicon surfaces, and silicon nitride and silicon dioxide films...
November 29, 2017: Lab on a Chip
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