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https://www.readbyqxmd.com/read/29145567/influence-of-airflow-rate-and-stimulus-concentration-on-olfactory-event-related-potentials-oerp-in-humans
#1
Pengfei Han, Valentin A Schriever, Per Peters, Heidi Olze, Florian C Uecker, Thomas Hummel
Although the association between odor concentration and olfactory event-related potential (OERP) has been studied, less is known about the influence of airflow on OERP. The aim of this study was to investigate the influence of airflow rate and stimulus concentration on OERP in humans. EEG data were collected from young healthy volunteers (n=17) in separate sessions where 2-phenylethanol (PEA) was delivered in the following conditions: 8L/min 50%v/v, 8L/min 30%v/v, 4L/min 100%v/v and 4L/min 60%v/v. Odor concentrations are referred to the %v/v achieved with air dilution and was not measured in the nose...
November 14, 2017: Chemical Senses
https://www.readbyqxmd.com/read/29145457/association-between-environmental-noise-and-subjective-symptoms-related-to-cardiovascular-diseases-among-elderly-individuals-in-japan
#2
Kenichi Azuma, Iwao Uchiyama
Noise in housing environments may increase the risk of cardiovascular diseases (CVDs); however, the most significant sources of noise among elderly individuals remain poorly understood. A nationwide cross-sectional study comprised of 6,181 elderly people (age ≥ 65 years) was conducted using a web-based self-reported questionnaire in 2014. Questions pertaining to CVD-related subjective symptoms within the past year addressed symptoms of chest pain, disturbances in pulse, acute impaired tongue movement, limb paralysis, and foot pain or numbness during walking...
2017: PloS One
https://www.readbyqxmd.com/read/29145455/association-of-polymorphisms-in-heat-shock-protein-70-genes-with-the-susceptibility-to-noise-induced-hearing-loss-a-meta-analysis
#3
Shimin Zong, Xue Zeng, Tianyi Liu, Fangmin Wan, Pan Luo, Hongjun Xiao
BACKGROUND: Several case-control studies reported the relationship between single nucleotide polymorphisms (SNPs) in HSP70 genes and noise-induced hearing loss (NIHL). However, their conclusions are conflicting. This meta-analysis aims to identify the association of HSP70 variants and NIHL susceptibility. METHOD: A systematical literature search was performed in PubMed, Web of Science, EMBASE, and Wanfang Chinese database. The pooled odds radio (OR), 95% confidence interval (CI) and p value were calculated in fixed- or random-effects model according to the I2 value in the heterogeneity test...
2017: PloS One
https://www.readbyqxmd.com/read/29145137/uncertainty-in-positive-matrix-factorization-solutions-for-pahs-in-surface-sediments-of-the-yangtze-river-estuary-in-different-seasons
#4
Ruimin Liu, Cong Men, Wenwen Yu, Fei Xu, Qingrui Wang, Zhenyao Shen
To examine the variabilities of source contributions in the Yangtze River Estuary (YRE), the uncertainty based on the positive matrix factorization (PMF) was applied to the source apportionment of the 16 priority PAHs in 120 surface sediment samples from four seasons. Based on the signal-to-noise ratios, the PAHs categorized as "Bad" might drop out of the estimation of bootstrap. Next, the spatial variability of residuals was applied to determine which species with non-normal curves should be excluded. The median values from the bootstrapped solutions were chosen as the best estimate of the true factor contributions, and the intervals from 5th to 95th percentile represent the variability in each sample factor contribution...
October 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145044/image-processing-for-precise-three-dimensional-registration-and-stitching-of-thick-high-resolution-laser-scanning-microscopy-image-stacks
#5
Chloé Murtin, Carole Frindel, David Rousseau, Kei Ito
The possible depth of imaging of laser-scanning microscopy is limited not only by the working distances of objective lenses but also by image degradation caused by attenuation and diffraction of light passing through the specimen. To tackle this problem, one can either flip the sample to record images from both sides of the specimen or consecutively cut off shallow parts of the sample after taking serial images of certain thickness. Multiple image substacks acquired in these ways should be combined afterwards to generate a single stack...
November 8, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29145024/direct-analysis-of-ethylene-glycol-in-human-serum-on-the-basis-of-analyte-adduct-formation-and-liquid-chromatography-tandem-mass-spectrometry
#6
Marek Dziadosz
The aim of this work was to develop a fast, cost-effective and time-saving liquid chromatography-tandem mass spectrometry (LC-MS/MS) analytical method for the analysis of ethylene glycol (EG) in human serum. For these purposes, the formation/fragmentation of an EG adduct ion with sodium and sodium acetate was applied in the positive electrospray mode for signal detection. Adduct identification was performed with appropriate infusion experiments based on analyte solutions prepared in different concentrations...
November 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29145020/evaluation-of-7-be-and-133-xe-atmospheric-radioactivity-time-series-measured-at-four-ctbto-radionuclide-stations
#7
Stefano Bianchi, Alessandro Longo, Wolfango Plastino, Pavel P Povinec
Time series analysis of (7)Be and (133)Xe atmospheric data and meteorological parameters measured at four CTBTO/IMS radionuclide stations have shown great variability in terms of noise structures, harmonic content, cross-correlation patterns and local Hurst exponent behaviour. This study focused on highlighting and characterising both differences and similarities expected for these radionuclides due to their different physical and chemical characteristics along with their different source terms. Detrended crosscorrelation analysis of different meteorological parameters influencing the residuals time series has shown that for Canadian and American stations the parameters mostly affecting radionuclide concentrations in the air seem to be wind direction and atmospheric pressure...
November 2, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29144792/effect-of-blood-collection-tube-type-and-time-to-processing-on-the-enumeration-and-high-content-characterization-of-circulating-tumor-cells-using-the-high-definition-single-cell-assay
#8
Mariam Rodríguez-Lee, Anand Kolatkar, Madelyn McCormick, Angel D Dago, Jude Kendall, Nils Anders Carlsson, Kelly Bethel, Emily J Greenspan, Shelley E Hwang, Kathryn R Waitman, Jorge J Nieva, James Hicks, Peter Kuhn
CONTEXT: - As circulating tumor cell (CTC) assays gain clinical relevance, it is essential to address preanalytic variability and to develop standard operating procedures for sample handling in order to successfully implement genomically informed, precision health care. OBJECTIVE: - To evaluate the effects of blood collection tube (BCT) type and time-to-assay (TTA) on the enumeration and high-content characterization of CTCs by using the high-definition single-cell assay (HD-SCA)...
November 16, 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/29144031/error-analysis-of-helmholtz-based-mr-electrical-properties-tomography
#9
Stefano Mandija, Alessandro Sbrizzi, Ulrich Katscher, Peter R Luijten, Cornelis A T van den Berg
PURPOSE: MR electrical properties tomography (MR-EPT) aims to measure tissue electrical properties by computing spatial derivatives of measured B1+ data. This computation is very sensitive to spatial fluctuations caused, for example, by noise and Gibbs ringing. In this work, the error arising from the computation of spatial derivatives using finite difference kernels (FD error) has been investigated. In relation to this FD error, it has also been investigated whether mitigation strategies such as Gibbs ringing correction and Gaussian apodization can be beneficial for conductivity reconstructions...
November 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29143446/realism-in-paediatric-emergency-simulations-a-prospective-comparison-of-in-situ-low-fidelity-and-centre-based-high-fidelity-scenarios
#10
Fenton O'Leary, Ioannis Pegiazoglou, Kathryn McGarvey, Ruza Novakov, Ingrid Wolfsberger, Jennifer Peat
OBJECTIVE: To measure scenario participant and faculty self-reported realism, engagement and learning for the low fidelity, in situ simulations and compare this to high fidelity, centre-based simulations. METHODS: A prospective survey of scenario participants and faculty completing in situ and centre-based paediatric simulations. RESULTS: There were 382 responses, 276 from scenario participants and 106 from faculty with 241 responses from in situ and 141 from centre-based simulations...
November 16, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/29143152/electrochemical-and-theoretical-studies-of-the-interactions-of-a-pyridyl-based-corrosion-inhibitor-with-iron-clusters-fe15-fe30-fe45-and-fe60
#11
Julian Cruz-Borbolla, Esteban Garcia-Ochoa, Jayanthi Narayanan, Pablo Maldonado-Rivas, Thangarasu Pandiyan, José M Vásquez-Pérez
The capacity of 2,6-bis[((2-pyridylmethyl)oxy)methyl)]pyridine (BPMMP) to inhibit the corrosion of mild carbon steel in HCl was analyzed. In a polarization study, both the cathodic and anodic currents were appreciably decreased in the presence of BPMMP, suggesting that this ligand is effective at inhibiting corrosion at the metal surface. This conclusion is consistent with the results of impedance analysis, where only one time constant corresponding to one depressed capacitive loop was detected, and the diameter of the impedance plot was directly related to the concentration of BPMMP...
November 15, 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29142590/birdcage-volume-coils-and-magnetic-resonance-imaging-a-simple-experiment-for-students
#12
Dwight E Vincent, Tianhao Wang, Thalia A K Magyar, Peni I Jacob, Richard Buist, Melanie Martin
Background: This article explains some simple experiments that can be used in undergraduate or graduate physics or biomedical engineering laboratory classes to learn how birdcage volume radiofrequency (RF) coils and magnetic resonance imaging (MRI) work. For a clear picture, and to do any quantitative MRI analysis, acquiring images with a high signal-to-noise ratio (SNR) is required. With a given MRI system at a given field strength, the only means to change the SNR using hardware is to change the RF coil used to collect the image...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29142343/calculating-gamma-camera-uniformity-parameters-beyond-the-vendor-specific-protocol
#13
Anil Kumar Pandey, Param Dev Sharma, Jay Prakash Kumar, Kartik Saroha, Chetan Patel, Chandra Sekhar Bal, Rakesh Kumar
Objectives: The aim of this study was to develop and verify a personal computer-based software tool for calculating uniformity indices of gamma camera. Materials and Methods: The program was developed in MATLAB R2013b under Microsoft Windows operating system. Noise-less digital phantoms with known uniformity parameters were used to verify the accuracy of the program. Two hundred and forty-four Co-57 flood source images were acquired on Symbia T6 and Discovery nuclear medicine/computed tomography 670...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29142279/modifying-response-times-in-the-simon-task-with-transcranial-random-noise-stimulation
#14
James Robert McIntosh, Carsten Mehring
Perceptual decisions pervade our every-day lives, and can align or conflict with inbuilt biases. We investigated these conflicting biases by applying transcranial random noise stimulation (tRNS) while subjects took part in a visual Simon task - a paradigm where irrelevant spatial cues influence the response times of subjects to relevant colour cues. We found that tRNS reduces the response time of subjects independent of the congruence between spatial and colour cues, but dependent on the baseline response time, both between subjects and across conditions within subjects...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29142267/in-vivo-characterization-of-the-electrophysiological-and-astrocytic-responses-to-a-silicon-neuroprobe-implanted-in-the-mouse-neocortex
#15
Katrien Mols, Silke Musa, Bart Nuttin, Liesbet Lagae, Vincent Bonin
Silicon neuroprobes hold great potential for studies of large-scale neural activity and brain computer interfaces, but data on brain response in chronic implants is limited. Here we explored with in vivo cellular imaging the response to multisite silicon probes for neural recordings. We tested a chronic implant for mice consisting of a CMOS-compatible silicon probe rigidly implanted in the cortex under a cranial imaging window. Multiunit recordings of cortical neurons with the implant showed no degradation of electrophysiological signals weeks after implantation (mean spike and noise amplitudes of 186 ± 42 µVpp and 16 ± 3...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29142116/indirectly-connected-simple-social-differences-can-explain-the-causes-and-apparent-consequences-of-complex-social-network-positions
#16
Josh A Firth, Ben C Sheldon, Lauren J N Brent
Animal societies are often structurally complex. How individuals are positioned within the wider social network (i.e. their indirect social connections) has been shown to be repeatable, heritable and related to key life-history variables. Yet, there remains a general lack of understanding surrounding how complex network positions arise, whether they indicate active multifaceted social decisions by individuals, and how natural selection could act on this variation. We use simulations to assess how variation in simple social association rules between individuals can determine their positions within emerging social networks...
November 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29142096/novel-ca-2-dependent-mechanisms-regulate-spontaneous-release-at-excitatory-synapses-onto-ca1-pyramidal-cells
#17
Walter E Babiec, Thomas J O'Dell
Although long thought to simply be a source of synaptic noise, spontaneous, action-potential independent release of neurotransmitter from presynaptic terminals has multiple roles in synaptic function. We explored whether and to what extent the two predominantly proposed mechanisms for explaining spontaneous release, stochastic activation of voltage-gated Ca(2+) channels (VGCCs) or activation of Ca(2+)-sensing receptors (CaSRs) by extracelluar Ca(2+), played a role in the sensitivity of spontaneous release to the level of extracellular Ca(2+) concentration at excitatory synapses at CA1 pyramidal cells of the adult, male mouse hippocampus...
November 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29142058/juvenile-female-rats-but-not-male-rats-show-renewal-reinstatement-and-spontaneous-recovery-following-extinction-of-conditioned-fear
#18
Chun Hui J Park, Despina E Ganella, Jee Hyun Kim
Anxiety disorders emerge early, and girls are significantly more likely to develop anxiety compared to boys. However, sex differences in fear during development are poorly understood. Therefore, we investigated juvenile male and female rats in the relapse behaviors following extinction of conditioned fear. In all experiments, 18-d-old rats first received three white-noise-footshock pairings on day 1. On day 2, extinction involved 60 white-noise alone trials. In experiment 1, we examined renewal by testing the rats in either the same or different context as extinction on day 3...
December 2017: Learning & Memory
https://www.readbyqxmd.com/read/29141776/evaluation-of-a-new-ensemble-learning-framework-for-mass-classification-in-mammograms
#19
Omid Rahmani Seryasat, Javad Haddadnia
BACKGROUND: Mammography is the most common screening method for diagnosis of breast cancer. MATERIALS AND METHODS: In this study, a computer-aided system for diagnosis of benignity and malignity of the masses was implemented in mammogram images. In the computer aided diagnosis system, we first reduce the noise in the mammograms using an effective noise removal technique. After the noise removal, the mass in the region of interest must be segmented and this segmentation is done using a deformable model...
May 22, 2017: Clinical Breast Cancer
https://www.readbyqxmd.com/read/29141772/acoustic-analysis-of-soccer-fans-in-acute-phonotrauma-after-the-match
#20
Mehmet Ozgur Pinarbasli, Ercan Kaya, Erkan Ozudogru, Melek Kezban Gurbuz, Ertugrul Colak, Mehmet Akif Aksoy, Leman Birdane, Fatma Ozgur Guney
OBJECTIVES: Acute phonotrauma is the result of sound production by shouting or straining one's voice. In this study, we aimed to investigate the acute changes in the vocal folds and voices of soccer fans who voluntarily applied to our clinic after the soccer match where they engaged in acute phonotrauma. There are no other studies in the literature conducted on a similar sample group. STUDY DESIGN: This is a case-control study. METHODS: Videolaryngostroboscopic (VLS) examination, acoustic voice analysis, and Voice Handicap Index (VHI) questionnaire were performed on 29 voluntary soccer fans included to the study before the match and at the first hour after the match...
November 13, 2017: Journal of Voice: Official Journal of the Voice Foundation
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