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https://www.readbyqxmd.com/read/28212416/the-variability-of-multisensory-processes-of-natural-stimuli-in-human-and-non-human-primates-in-a-detection-task
#1
Cécile Juan, Céline Cappe, Baptiste Alric, Benoit Roby, Sophie Gilardeau, Pascal Barone, Pascal Girard
BACKGROUND: Behavioral studies in both human and animals generally converge to the dogma that multisensory integration improves reaction times (RTs) in comparison to unimodal stimulation. These multisensory effects depend on diverse conditions among which the most studied were the spatial and temporal congruences. Further, most of the studies are using relatively simple stimuli while in everyday life, we are confronted to a large variety of complex stimulations constantly changing our attentional focus over time, a modality switch that can impact on stimuli detection...
2017: PloS One
https://www.readbyqxmd.com/read/28212348/an-electromagnetic-sensor-for-the-autonomous-running-of-visually-impaired-and-blind-athletes-part-ii-the-wearable-device
#2
Marco Pieralisi, Valentina Di Mattia, Valerio Petrini, Alfredo De Leo, Giovanni Manfredi, Paola Russo, Lorenzo Scalise, Graziano Cerri
Currently, the availability of technology developed to increase the autonomy of visually impaired athletes during sports is limited. The research proposed in this paper (Part I and Part II) focuses on the realization of an electromagnetic system that can guide a blind runner along a race track without the need for a sighted guide. In general, the system is composed of a transmitting unit (widely described in Part I) and a receiving unit, whose components and main features are described in this paper. Special attention is paid to the definition of an electromagnetic model able to faithfully represent the physical mechanisms of interaction between the two units, as well as between the receiving magnetic sensor and the body of the user wearing the device...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28211793/a-novel-field-emission-microscopy-method-to-study-field-emission-characteristics-of-freestanding-carbon-nanotube-array
#3
Yunhan Li, Yonghai Sun, David Jaffray, John T W Yeow
Field emission (FE) uniformity and mechanism of emitter failure of freestanding carbon nanotube (CNT) arrays have not been well studied due to the difficulty of observing and quantifying FE performance of each emitter in CNT arrays. Herein a field emission microscopy (FEM) method based on Poly(methyl methacrylate) (PMMA) thin film is proposed to study the FE uniformity and CNT emitter failure of freestanding CNT arrays. FE uniformity of freestanding CNT arrays and different levels of FE current contributions from each emitter in the arrays are recorded and visualized...
February 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211591/magnetic-resonance-imaging-of-the-knee-an-overview-and-update-of-conventional-and-state-of-the-art-imaging
#4
Nicholas C Nacey, Matthew G Geeslin, Grady Wilson Miller, Jennifer L Pierce
: Magnetic resonance imaging (MRI) has become the preferred modality for imaging the knee to show pathology and guide patient management and treatment. The knee is one of the most frequently injured joints, and knee pain is a pervasive difficulty that can affect all age groups. Due to the diverse pathology, complex anatomy, and a myriad of injury mechanisms of the knee, the MRI knee protocol and sequences should ensure detection of both soft tissue and osseous structures in detail and with accuracy...
February 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28210998/on-t%C3%AF-he-distinction-between-value-driven-attention-and-selection-history-evidence-from-individuals-with-depressive-symptoms
#5
Brian A Anderson, Michelle Chiu, Michelle M DiBartolo, Stephanie L Leal
When predictive of extrinsic reward as targets, stimuli rapidly acquire the ability to automatically capture attention. Attentional biases for former targets of visual search also can develop without reward feedback but typically require much longer training. These learned biases towards former targets often are conceptualized within a single framework and might differ merely in degree. That is, both are the result of the reinforcement of selection history, with extrinsic reward for correct report of the target providing greater reinforcement than correct report alone...
February 16, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28210001/visualization-of-au-nanoparticles-buried-in-a-polymer-matrix-by-scanning-thermal-noise-microscopy
#6
Atsushi Yao, Kei Kobayashi, Shunta Nosaka, Kuniko Kimura, Hirofumi Yamada
Several researchers have recently demonstrated visualization of subsurface features with a nanometer-scale resolution using various imaging schemes based on atomic force microscopy. Since all these subsurface imaging techniques require excitation of the oscillation of the cantilever and/or sample surface, it has been difficult to identify a key imaging mechanism. Here we demonstrate visualization of Au nanoparticles buried 300 nm into a polymer matrix by measurement of the thermal noise spectrum of a microcantilever with a tip in contact to the polymer surface...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28209898/treadmilling-by-ftsz-filaments-drives-peptidoglycan-synthesis-and-bacterial-cell-division
#7
Alexandre W Bisson-Filho, Yen-Pang Hsu, Georgia R Squyres, Erkin Kuru, Fabai Wu, Calum Jukes, Yingjie Sun, Cees Dekker, Seamus Holden, Michael S VanNieuwenhze, Yves V Brun, Ethan C Garner
The mechanism by which bacteria divide is not well understood. Cell division is mediated by filaments of FtsZ and FtsA (FtsAZ) that recruit septal peptidoglycan-synthesizing enzymes to the division site. To understand how these components coordinate to divide cells, we visualized their movements relative to the dynamics of cell wall synthesis during cytokinesis. We found that the division septum was built at discrete sites that moved around the division plane. FtsAZ filaments treadmilled circumferentially around the division ring and drove the motions of the peptidoglycan-synthesizing enzymes...
February 17, 2017: Science
https://www.readbyqxmd.com/read/28209521/impaired-visual-competition-in-patients-with-homonymous-visual-field-defects
#8
A C Geuzebroek, A V van den Berg
Intense visual training can lead to partial recovery of visual field defects caused by lesions of the primary visual cortex. However, the standard visual detection and discrimination tasks, used to assess this recovery process tend to ignore the complexity of the natural visual environment, where multiple stimuli continuously interact. Visual competition is an essential component for natural search tasks and detecting unexpected events. Our study focused on visual decision-making and to what extent the recovered visual field can compete for attention with the 'intact' visual field...
February 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28208772/transcriptional-and-behavioral-responses-of-zebrafish-larvae-to-microcystin-lr-exposure
#9
Eleni Tzima, Iliana Serifi, Ioanna Tsikari, Ainhoa Alzualde, Ioannis Leonardos, Thomais Papamarcaki
Microcystins are cyclic heptapeptides that constitute a diverse group of toxins produced by cyanobacteria. One of the most toxic variants of this family is microcystin-LR (MCLR) which is a potent inhibitor of protein phosphatase 2A (PP2A) and induces cytoskeleton alterations. In this study, zebrafish larvae exposed to 500 μg/L of MCLR for four days exhibited a 40% reduction of PP2A activity compared to the controls, indicating early effects of the toxin. Gene expression profiling of the MCLR-exposed larvae using microarray analysis revealed that keratin 96 (krt96) was the most downregulated gene, consistent with the well-documented effects of MCLR on cytoskeleton structure...
February 9, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28208719/micro-computed-tomography-detection-of-gold-nanoparticle-labelled-mesenchymal-stem-cells-in-the-rat-subretinal-layer
#10
Pooi Ling Mok, Sue Ngein Leow, Avin Ee-Hwan Koh, Hairul Harun Mohd Nizam, Suet Lee Shirley Ding, Chi Luu, Raduan Ruhaslizan, Hon Seng Wong, Wan Haslina Wan Abdul Halim, Min Hwei Ng, Ruszymah Binti Hj Idrus, Shiplu Roy Chowdhury, Catherine Mae-Lynn Bastion, Suresh Kumar Subbiah, Akon Higuchi, Abdullah A Alarfaj, Kong Yong Then
Mesenchymal stem cells are widely used in many pre-clinical and clinical settings. Despite advances in molecular technology; the migration and homing activities of these cells in in vivo systems are not well understood. Labelling mesenchymal stem cells with gold nanoparticles has no cytotoxic effect and may offer suitable indications for stem cell tracking. Here, we report a simple protocol to label mesenchymal stem cells using 80 nm gold nanoparticles. Once the cells and particles were incubated together for 24 h, the labelled products were injected into the rat subretinal layer...
February 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28208700/role-of-protein-quality-control-failure-in-alcoholic-hepatitis-pathogenesis
#11
REVIEW
Samuel W French, Maryam Masouminia, Sara Samadzadeh, Brittany C Tillman, Alejandro Mendoza, Barbara A French
: The mechanisms of protein quality control in hepatocytes in cases of alcoholic hepatitis (AH) including ufmylation, FAT10ylation, metacaspase 1 (Mca1), ERAD (endoplasmic reticulum-associated degradation), JUNQ (juxta nuclear quality control), IPOD (insoluble protein deposit) autophagocytosis, and ER stress are reviewed. The Mallory-Denk body (MDB) formation develops in the hepatocytes in alcoholic hepatitis as a consequence of the failure of these protein quality control mechanisms to remove misfolded and damaged proteins and to prevent MDB aggresome formation within the cytoplasm of hepatocytes...
February 8, 2017: Biomolecules
https://www.readbyqxmd.com/read/28208588/depicting-binding-mediated-translocation-of-hiv-1-tat-peptides-in-living-cells-with-nanoscale-pens-of-tat-conjugated-quantum-dots
#12
Chien Y Lin, Jung Y Huang, Leu-Wei Lo
Cell-penetrating peptides (CPPs) can translocate across cell membranes, and thus have great potential for the cellular delivery of macromolecular cargoes. However, the mechanism of this cellular uptake process is not yet fully understood. In this study, a time-lapse single-particle light-sheet microscopy technique was implemented to obtain a parallel visualization of the translocating process of individual human immunodeficiency virus 1 (HIV-1) transactivator of transcription (Tat) peptide conjugated quantum dots (TatP-QDs) in complex cellular terrains...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28207827/replication-of-snp-associations-with-keratoconus-in-a-czech-cohort
#13
Petra Liskova, Lubica Dudakova, Anna Krepelova, Jiri Klema, Pirro G Hysi
INTRODUCTION: Keratoconus is a relatively frequent disease leading to severe visual impairment. Existing therapies are imperfect and clinical management may benefit from improved understanding of mechanisms leading to this disease. We aim to investigate the replication of 11 single nucleotide polymorphisms (SNPs) with keratoconus. METHODS: SNPs from loci previously found in association with keratoconus were genotyped in 165 keratoconus cases of Caucasian Czech origin (108 males and 57 females) and 193 population and gender-matched controls...
2017: PloS One
https://www.readbyqxmd.com/read/28206989/il-4-mediated-by-hsv-vector-suppresses-morphine-withdrawal-response-through-decreasing-tnf%C3%AE-nr2b-and-pc-ebp%C3%AE-in-the-periaqueductal-gray-in-rats
#14
H Yi, T Iida, S Liu, D Ikegami, Q Liu, A Iida, D A Lubarsky, S Hao
Chronic opiates induce the development of physical dependence. Opioid physical dependence characterized by withdrawal symptoms, may have very long-lasting effects on the motivation for reward, including the incubation of cue-induced drug-seeking behavior. Elucidation of the mechanisms involved in physical dependence is crucial to developing more effective treatment strategies for opioid dependence. Chronic morphine induces production of proinflammatory cytokines in regional-specific sites of the brain. Interleukin-4 (IL-4) is a prototypical anti-inflammatory cytokine that globally suppresses proinflammatory cytokines...
February 16, 2017: Gene Therapy
https://www.readbyqxmd.com/read/28205497/critical-motor-involvement-in-prediction-of-human-and-non-biological-motion-trajectories
#15
Matthieu M de Wit, Laurel J Buxbaum
OBJECTIVES: Adaptive interaction with the environment requires the ability to predict both human and non-biological motion trajectories. Prior accounts of the neurocognitive basis for prediction of these two motion classes may generally be divided into those that posit that non-biological motion trajectories are predicted using the same motor planning and/or simulation mechanisms used for human actions, and those that posit distinct mechanisms for each. Using brain lesion patients and healthy controls, this study examined critical neural substrates and behavioral correlates of human and non-biological motion prediction...
February 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28203269/bionic-vision-based-intelligent-power-line-inspection-system
#16
Qingwu Li, Yunpeng Ma, Feijia He, Shuya Xi, Jinxin Xu
Detecting the threats of the external obstacles to the power lines can ensure the stability of the power system. Inspired by the attention mechanism and binocular vision of human visual system, an intelligent power line inspection system is presented in this paper. Human visual attention mechanism in this intelligent inspection system is used to detect and track power lines in image sequences according to the shape information of power lines, and the binocular visual model is used to calculate the 3D coordinate information of obstacles and power lines...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28202573/alteration-of-the-microsaccadic-velocity-amplitude-main-sequence-relationship-after-visual-transients-implications-for-models-of-saccade-control
#17
Antimo Buonocore, Chih-Yang Chen, Xiaoguang Tian, Saad Idrees, Thomas Muench, Ziad M Hafed
Microsaccades occur during gaze fixation in order to correct for miniscule foveal motor errors. The mechanisms governing such fine oculomotor control are still not fully understood. In this study, we explored microsaccade control by analyzing the impacts of transient visual stimuli on these movements' kinematics. We found that such kinematics can be altered in systematic ways depending on the timing and spatial geometry of visual transients relative to the movement goals. In two male rhesus macaques, we presented peripheral or foveal visual transients during an otherwise stable period of fixation...
February 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28202254/robust-interactions-between-the-effects-of-auditory-and-cutaneous-electrical-stimulations-on-cell-activities-in-the-thalamic-reticular-nucleus
#18
Akihisa Kimura
The thalamic reticular nucleus (TRN), a cluster of GABAergic cells, is thought to regulate bottom-up and top-down streams of sensory processing in the loop circuitry between the thalamus and cortex. Provided that sensory inputs of different modalities interact in the TRN, the TRN could contribute to fast and flexible cross-modal modulation of attention and perception that incessantly takes place in our every day life. Indeed, diverse subthreshold interactions of auditory and visual inputs have been revealed in TRN cells (Kimura, 2014)...
February 12, 2017: Brain Research
https://www.readbyqxmd.com/read/28201999/effect-of-myeloid-differentiation-primary-response-gene-88-on-expression-profiles-of-genes-during-the-development-and-progression-of-helicobacter-induced-gastric-cancer
#19
Ivonne Lozano-Pope, Arnika Sharma, Michael Matthias, Kelly S Doran, Marygorret Obonyo
BACKGROUND: Gastric cancer is one of the most common and lethal type of cancer worldwide. Infection with Helicobacter pylori (H. pylori) is recognized as the major cause of gastric cancer. However, it remains unclear the mechanism by which Helicobacter infection leads to gastric cancer. Furthermore, the underlying molecular events involved during the progression of Helicobacter infection to gastric malignancy are not well understood. In previous studies, we demonstrated that that H. felis-infected Myd88 (-/-) mice exhibited dramatic pathology and an accelerated progression to gastric dysplasia; however, the MyD88 downstream gene targets responsible for this pathology have not been described...
February 15, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28199731/proteomic-profiling-analysis-reveals-a-link-between-experimental-autoimmune-uveitis-and-complement-activation-in-rats
#20
Dadong Guo, Bing Hu, Hongying Tang, Yuanyuan Sun, Bin Liu, Qingmei Tian, Hongsheng Bi
Uveitis is an autoimmune disease that usually damages the vision function, leading to poor visual quality in patients. As an autoimmune ocular inflammatory disease, the pathogenesis of uveitis is associated with abnormal expression of some proteins and aberrant regulation of multiple signaling pathways. Nevertheless, the detailed mechanism remains unclear. In this study, we induced an experimental autoimmune uveitis (EAU) model in rats. We determined the levels of C3a and membrane attack complex C5b-9 (soluble C5b-9, sC5b-9) in both plasma and aqueous humor, identified the differentially expressed proteins in plasma by liquid chromatography-tandem mass spectrometry, and employed bioinformatics algorithms to analyze differentially expressed proteins in EAU rat plasma...
February 15, 2017: Scandinavian Journal of Immunology
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