keyword
MENU ▼
Read by QxMD icon Read
search

artefact

keyword
https://www.readbyqxmd.com/read/28229407/assessment-of-energy-metabolic-changes-in-adipose-tissue-derived-stem-cells
#1
Ghazaleh Hajmousa, Martin C Harmsen
Adipose tissue-derived stem cells (ADSC) are promising candidates for therapeutic applications in cardiovascular regenerative medicine. By definition, the phenotype ADSCs, e.g., the ubiquitous secretion of growth factors, cytokines, and extracellular matrix components is not met in vivo, which renders ADSC a culture "artefact." The medium constituents therefore impact the efficacy of ADSC. Little attention has been paid to the energy source in medium, i.e., glucose, which feeds the cell's power plants: mitochondria...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28226721/overcoming-spatio-temporal-limitations-using-dynamically-scaled-in-vitro-pc-mri-a-flow-field-comparison-to-true-scale-computer-simulations-of-idealized-stented-and-patient-specific-left-main-bifurcations
#2
Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan, Susann Beier, John Ormiston, Mark Webster, John Cater, Stuart Norris, Pau Medrano-Gracia, Alistair Young, Kathleen Gilbert, Brett Cowan, Stuart Norris, Brett Cowan, Pau Medrano-Gracia, Kathleen Gilbert, Mark Webster, Alistair Young, Susann Beier, John Cater, John Ormiston
The majority of patients with angina or heart failure have coronary artery disease. Left main bifurcations are particularly susceptible to pathological narrowing. Flow is a major factor of atheroma development, but limitations in imaging technology such as spatio-temporal resolution, signal-to-noise ratio (SNRv), and imaging artefacts prevent in vivo investigations. Computational fluid dynamics (CFD) modelling is a common numerical approach to study flow, but it requires a cautious and rigorous application for meaningful results...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226689/patient-movement-compensation-for-3d-echocardiography-fusion
#3
Abhilash R Hareendranathan, Michelle Hanbidge, Allen He, Michelle Noga, Pierre Boulanger, Harald Becher, Kumaradevan Punithakumar, Abhilash R Hareendranathan, Michelle Hanbidge, Allen He, Michelle Noga, Pierre Boulanger, Harald Becher, Kumaradevan Punithakumar, Allen He, Pierre Boulanger, Harald Becher, Michelle Noga, Kumaradevan Punithakumar, Michelle Hanbidge, Abhilash R Hareendranathan
Limited field of view (FOV) is a major problem for 3D real-time echocardiography (3DRTE), which results in an incomplete representation of cardiac anatomy. Various image registration techniques have been proposed to improve the field of view in 3DRTE by fusing multiple image volumes. However, these techniques require significant overlap between the individual volumes and rely on high image resolution and high signal-to-noise ratio. Changes in the heart position due to patient movement during image acquisition can also reduce the quality of image fusion...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226664/channel-interpolation-in-tms-eeg-a-quantitative-study-towards-an-accurate-topographical-representation
#4
S Petrichella, L Vollere, F Ferreri, A Guerra, S Maatta, M Kononen, V Di Lazzaro, G Iannello, S Petrichella, L Vollere, F Ferreri, A Guerra, S Maatta, M Kononen, V Di Lazzaro, G Iannello, S Petrichella, M Kononen, G Iannello, A Guerra, S Maatta, V Di Lazzaro, F Ferreri
The co-registration of transcranial magnetic stimulation and electroencephalography (TMS-EEG) is emerging as a successful technique for causally exploring cortical mechanisms and connections. However, various artefacts could affect TMS-EEG signals. Correct artefacted channels reconstruction is crucial to obtain accurate topographical representation and consequently accurate inverse problem solution, in order to map in a proper way the global brain responses after the stimulation of one particular brain region of interest...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226605/semi-automated-image-analysis-of-gel-electrophoresis-of-cerebrospinal-fluid-for-oligoclonal-band-detection
#5
S Boudet, L Peyrodie, Z Wang, G Forzy, S Boudet, L Peyrodie, Z Wang, G Forzy, Z Wang, L Peyrodie, S Boudet, G Forzy
Detection of oligoclonal electrophoretic bands in cerebrospinal fluid (CSF) is an important diagnostic tool for Multiple Sclerosis (MS). Electrophoretic profiles are difficult to interpret due to low contrast and artefacts. A semi-automated method to ease analysis and to reduce subjectivity is presented. The method sequentially converts color images to grayscale, realigns bands, removes artifacts, then converts 2D images to a signal, before detecting, thresholding and editing peaks to optimize profiles. Such treated profiles (21 positive and 15 negative) are compared to ground truth analysis of an expert biologist...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226588/robust-estimation-of-respiratory-rate-via-ecg-and-ppg-derived-respiratory-quality-indices
#6
Drew A Birrenkott, Marco A F Pimentel, Peter J Watkinson, David A Clifton, Drew A Birrenkott, Marco A F Pimentel, Peter J Watkinson, David A Clifton, Peter J Watkinson, Marco A F Pimentel, Drew A Birrenkott, David A Clifton
Respiratory rate (RR) is one of the most informative indicators of a patient's health status. However, automated, non-invasive measurements of RR are insufficiently robust for use in clinical practice. A number of methods have been described in the literature to estimate RR from both photo-plethysmography (PPG) and electrocardiography (ECG) based on three physiological modulations of respiration: amplitude modulation (AM), frequency modulation (FM), and baseline wander (BW). However, the quality of the respiratory information acquired is highly patient-dependent and often too noisy to be used...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226529/shearlet-transform-a-good-candidate-for-compressed-sensing-in-optical-coherence-tomography
#7
Lesley-Ann Duflot, Alexandre Krupa, Brahim Tamadazte, Nicolas Andreff, Lesley-Ann Duflot, Alexandre Krupa, Brahim Tamadazte, Nicolas Andreff, Alexandre Krupa, Lesley-Ann Duflot, Brahim Tamadazte, Nicolas Andreff
This paper deals with the development of a fast and smart acquisition technique of Optical Coherence Tomography (OCT) data that has the capability to reconstruct missing data of OCT image. The main objective is to reduce the acquisition time (i.e., increase the frame rate) of an OCT-scan system by choosing a trajectory that covers entirely the image but that does not take all the measurements. The reconstruction of the missing data is achieved by applying an updated Fast Iterative Soft-Thresholding Algorithm (FISTA) on a sparse representation of the image...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222912/induced-circularly-polarized-luminescence-for-revealing-dna-binding-with-fluorescent-dyes
#8
Marcin Górecki, Francesco Zinna, Tarita Biver, Lorenzo Di Bari
To the best of our knowledge this is the first report on the application of induced circularly polarized luminescence (CPL) for sensing the binding of fluorescent dyes to double stranded DNA. Using Thiazole Orange (TO) and 4',6-diamidino-2-phenylindole (DAPI) as models, we show utility and limitations of CPL in DNA binding studies. The results obtained indicate that CPL can be used as a new chiroptical tool for this purpose, however, special attention while recording CPL data must be used, in order to exclude measurement artefacts caused by linear polarization components...
February 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28218854/long-range-dispersion-effects-on-the-water-vapor-interface-simulated-using-the-most-common-models
#9
Marcello Sega, Christoph Dellago
The long-range contribution to dispersion forces is known to have a major impact on the properties of inhomogeneous fluids, and its correct treatment is increasingly recognized as being a necessary requirement to avoid cutoff-related artefacts. Although analytical corrections for quantities like the surface tension are known, these can not take into account the structural changes induced by the long-range contributions. Here, we analyze the interfacial properties of seven popular water models, comparing the results with the cut-off version of the dispersion potential...
February 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28209016/the-dismal-state-of-pathology-laboratories-in-dental-colleges-a-stitch-in-time-can-save-nine
#10
Priyanka Kardam, Shweta Rehani, Sneha Sethi
Being a pathologist, we all are aware of the protocols which need to be followed in the histopathology laboratories. However, quite often due to our carelessness or busy schedules we tend to skip one or two steps in the protocol. These steps may appear to be insignificant at that time but later on they may take a toll on the diagnosis by creating an artefact. Here, we have presented a case of a similar artefact which tried to mask our diagnostic ability.
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28199902/refinement-of-clinical-x-ray-computed-tomography-ct-scans-containing-metal-implants
#11
Graham Treece
X-ray computed tomography (CT) data contains artefacts from many sources, with sufficient prominence to affect diagnostic utility when metal is present in the scans. These artefacts can be reduced, usually by the removal and in-filling of any sinogram data which has been affected by metal, and several such techniques have been proposed. Most of them are prone to introducing new artefacts into the CT data or may take a long time to correct the data. It is the purpose of this paper to introduce a new technique which is fast, yet can effectively remove most artefacts without introducing significant new ones...
February 1, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28199635/late-mitochondrial-origin-is-an-artefact
#12
William F Martin, Mayo Roettger, Chuan Ku, Sriram G Garg, Shijulal Nelson-Sathi, Giddy Landan
No abstract text is available yet for this article.
February 11, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28196473/2-7-million-samples-genotyped-for-hla-by-next-generation-sequencing-lessons-learned
#13
Gerhard Schöfl, Kathrin Lang, Philipp Quenzel, Irina Böhme, Jürgen Sauter, Jan A Hofmann, Julia Pingel, Alexander H Schmidt, Vinzenz Lange
BACKGROUND: At the DKMS Life Science Lab, Next Generation Sequencing (NGS) has been used for ultra-high-volume high-resolution genotyping of HLA loci for the last three and a half years. Here, we report on our experiences in genotyping the HLA, CCR5, ABO, RHD and KIR genes using a direct amplicon sequencing approach on Illumina MiSeq and HiSeq 2500 instruments. RESULTS: Between January 2013 and June 2016, 2,714,110 samples largely from German, Polish and UK-based potential stem cell donors have been processed...
February 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28194871/engineering-of-optically-encoded-microbeads-with-fret-free-spatially-separated-quantum-dot-layers-for-multiplexed-assays
#14
Igor Nabiev, Regina S Bilan, Viktor A Krivenkov, Mikhail A Berestovoy, Anton Efimov, Igor I Agapov, Pavel S Samokhvalov, Alyona V Sukhanova
Quantum dot (QD)-encoded microbeads are emerging for multiplexed analysis of biological markers. Quantitative encoding of the microbeads prepared with the different concentrations of QDs of different colors suffers from the resonance energy transfer from the QDs fluorescing at the shorter wavelengths to the QDs fluorescing at the longer wavelengths. Here, we have used the layer-by-layer deposition technique to spatially separate QDs of different colors with several polymer layers, so that the distance between them would be larger than the Förster energy transfer radius...
February 13, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28194506/treatment-of-type-ii-endoleaks-with-a-novel-agent-precipitating-hydrophobic-injectable-liquid-phil
#15
Amir Helmy, Nadeem Shaida
OBJECTIVE: Endovascular aortic aneurysm repair has become the principle technique used to treat abdominal aortic aneurysms. However, its long-term success is limited by complications, including type II endoleaks from lumbar arteries and the inferior mesenteric artery. Treatment of these endoleaks can be difficult. The most commonly performed procedure is embolisation via mesenteric or iliolumbar vessels. Embolic agents currently used include coils, glue and Onyx, all of which have their limitations...
February 13, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28193912/the-effects-of-graded-levels-of-calorie-restriction-viii-impact-of-short-term-calorie-and-protein-restriction-on-basal-metabolic-rate-in-the-c57bl-6-mouse
#16
Sharon E Mitchell, ZhanHui Tang, Celine Kerbois, Camille Delville, Davina Derous, Cara L Green, Yingchun Wang, Jackie J D Han, Luonan Chen, Alex Douglas, David Lusseau, Daniel E L Promislow, John R Speakman
Under calorie restriction (CR) animals need to lower energy demands. Whether this involves a reduction in cellular metabolism is an issue of contention. We exposed C57BL/6 mice to graded CR for 3 months, measured BMR and dissected out 20 body compartments. From a separate age-matched group (n=57), we built 7 predictive models for BMR. Unadjusted BMR declined with severity of restriction. Comparison of measured and predicted BMR from the simple models suggested suppression occurred. The extent of 'suppression' was greater with increased CR severity...
February 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28192977/matrix-assisted-laser-desorption-ionization-mass-fingerprinting-for-identification-of-acacia-gum-in-microsamples-from-works-of-art
#17
Clara Granzotto, Ken Sutherland
This paper reports an improved method for the identification of Acacia gum in cultural heritage samples using matrix assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) after enzymatic digestion of the polysaccharide component. The analytical strategy was optimized using a reference Acacia gum (gum arabic, sp. A. senegal) and provided an unambiguous MS profile of the gum, characterized by specific and recognized oligosaccharides, from as little as 0.1 μg of material. The enhanced experimental approach with reduced detection limit was successfully applied to the analysis of naturally aged (∼80 year) gum arabic samples, pure and mixed with lead white pigment, and allowed the detection of gum arabic in samples from a late painting (1949/1954) by Georges Braque in the collection of the Art Institute of Chicago...
February 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28190972/object-view-in-spatial-system-dynamics-a-grassland-farming-example
#18
REVIEW
Christian Neuwirth, Barbara Hofer, Andreas Schaumberger
Spatial system dynamics (SSD) models are typically implemented by linking stock variables to raster grids while the use of object representations of human artefacts such as buildings or ownership has been limited. This limitation is addressed by this article, which demonstrates the use of object representations in SSD. The objects are parcels of land that are attributed to grassland farms. The model simulates structural change in agriculture, i.e., change in the size of farms. The aim of the model is to reveal relations between structural change, farmland fragmentation and variable farmland quality...
July 2, 2016: J Spat Sci
https://www.readbyqxmd.com/read/28187332/elimination-of-digital-and-analog-artefacts-from-time-domain-signals
#19
Günter Hempel
A method is described for the elimination of artefacts that arise in time-domain signals because of the presence of digital and analogous filters. Such artefacts are mostly located at the beginning of the free-induction decay (FID). The procedure introduced here is particularly important if at least one signal component decays rather quickly, i.e. if there is only a small number of data containing this component (as for solid-state (1)H or (2)H FIDs). The method is able to restore the original signal by deconvolution of the spectrometer output from the transfer function of the spectrometer console...
February 3, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28185867/an-experimental-evaluation-of-the-role-of-the-stress-axis-in-mediating-predator-prey-interactions-in-wild-marine-fish
#20
Michael J Lawrence, Erika J Eliason, Jacob W Brownscombe, Kathleen M Gilmour, John W Mandelman, Steven J Cooke
The hypothalamic-pituitary-interrenal (HPI) axis, through corticosteroid secretion, is an integral mechanism regulating internal homeostasis when vertebrates are faced with a stressor. However, continued HPI-axis stimulation can produce homeostatic overload, where corticosteroids are detrimental to organismal function. This overload condition may play an important role in mediating predator-prey interactions, because chronically/previously stressed animals may have higher rates of predator-induced mortality...
February 7, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
keyword
keyword
89938
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"