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https://www.readbyqxmd.com/read/28737268/comparison-of-two-minimally-invasive-techniques-for-liver-biopsy-collection-in-dogs
#1
N Fernandez, J Del-Pozo, D Shaw, A I C Marques
OBJECTIVES: High-quality biopsy is an essential factor for the successful diagnosis of canine liver disease. The aim of this study was to compare various aspects of biopsies obtained by two different techniques: pretied ligating loop and cup biopsy forceps. MATERIALS AND METHODS: Fifteen client-owned dogs underwent laparoscopic liver biopsies for diagnosis of liver disease. Biopsies were obtained from the same liver lobe using a pre-tied ligating loop and cup biopsy forceps...
July 24, 2017: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/28736704/visualization-of-photoacoustic-images-in-a-limited-view-measuring-system-using-eigenvalues-of-a-photoacoustic-transmission-matrix
#2
Hiroshi Abe, Tsuyoshi Shiina
Photoacoustic imaging is a unique imaging method that involves extracting information from points at different depths, an advantage of ultrasound imaging, while maintaining functional information, a key feature of conventional photo imaging. This makes it easy to add functional images to ultrasound images by adding a laser pulse source to the conventional ultrasound imaging device and detecting a photo-ultrasound signal via a conventional ultrasound probe. One challenge when using normal one-dimensional (1D) probes and generating photoacoustic images is the limited-view problem, in which artefacts are observed due to the positions of the ultrasound transducers...
December 2017: Photoacoustics
https://www.readbyqxmd.com/read/28732554/microbial-ecology-and-process-technology-of-sourdough-fermentation
#3
Luc De Vuyst, Simon Van Kerrebroeck, Frédéric Leroy
From a microbiological perspective, sourdough is to be considered as a specific and stressful ecosystem, harboring yeasts and lactic acid bacteria (LAB), that is used for the production of baked goods. With respect to the metabolic impact of the sourdough microbiota, acidification (LAB), flavor formation (LAB and yeasts), and leavening (yeasts and heterofermentative LAB species) are most noticeable. Three distinct types of sourdough fermentation processes can be discerned based on the inocula applied, namely backslopped ones (type 1), those initiated with starter cultures (type 2), and those initiated with a starter culture followed by backslopping (type 3)...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/28728567/settings-and-artefacts-relevant-for-doppler-ultrasound-in-large-vessel-vasculitis
#4
REVIEW
L Terslev, A P Diamantopoulos, U Møller Døhn, W A Schmidt, S Torp-Pedersen
Ultrasound is used increasingly for diagnosing large vessel vasculitis (LVV). The application of Doppler in LVV is very different from in arthritic conditions. This paper aims to explain the most important Doppler parameters, including spectral Doppler, and how the settings differ from those used in arthritic conditions and provide recommendations for optimal adjustments. This is addressed through relevant Doppler physics, focusing, for example, on the Doppler shift equation and how angle correction ensures correctly displayed blood velocity...
July 20, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28728442/an-integrated-platform-for-small-animal-hyperthermia-investigations-under-ultra-high-field-mri-guidance
#5
Sergio Curto, Pegah Faridi, Tej B Shrestha, Marla Pyle, Leila Maurmann, Deryl Troyer, Stefan H Bossmann, Punit Prakash
PURPOSE: Integrating small-animal experimental hyperthermia instrumentation with magnetic resonance imaging (MRI) affords real-time monitoring of spatial temperature profiles. This study reports on the development and preliminary in vivo characterisation of a 2.45 GHz microwave hyperthermia system for pre-clinical small animal investigations, integrated within a 14 T ultra-high-field MRI scanner. MATERIALS AND METHODS: The presented system incorporates a 3.5 mm (OD) directional microwave hyperthermia antenna, positioned adjacent to the small-animal target, radiating microwave energy for localised heating of subcutaneous tumours...
July 21, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28728054/an-artificial-neural-network-system-to-identify-alleles-in-reference-electropherograms
#6
Duncan Taylor, Ash Harrison, David Powers
Electropherograms are produced in great numbers in forensic DNA laboratories as part of everyday criminal casework. Before the results of these electropherograms can be used they must be scrutinised by analysts to determine what the identified data tells them about the underlying DNA sequences and what is purely an artefact of the DNA profiling process. This process of interpreting the electropherograms can be time consuming and is prone to subjective differences between analysts. Recently it was demonstrated that artificial neural networks could be used to classify information within an electropherogram as allelic (i...
July 8, 2017: Forensic Science International. Genetics
https://www.readbyqxmd.com/read/28726833/human-occupation-of-northern-australia-by-65-000-years-ago
#7
Chris Clarkson, Zenobia Jacobs, Ben Marwick, Richard Fullagar, Lynley Wallis, Mike Smith, Richard G Roberts, Elspeth Hayes, Kelsey Lowe, Xavier Carah, S Anna Florin, Jessica McNeil, Delyth Cox, Lee J Arnold, Quan Hua, Jillian Huntley, Helen E A Brand, Tiina Manne, Andrew Fairbairn, James Shulmeister, Lindsey Lyle, Makiah Salinas, Mara Page, Kate Connell, Gayoung Park, Kasih Norman, Tessa Murphy, Colin Pardoe
The time of arrival of people in Australia is an unresolved question. It is relevant to debates about when modern humans first dispersed out of Africa and when their descendants incorporated genetic material from Neanderthals, Denisovans and possibly other hominins. Humans have also been implicated in the extinction of Australia's megafauna. Here we report the results of new excavations conducted at Madjedbebe, a rock shelter in northern Australia. Artefacts in primary depositional context are concentrated in three dense bands, with the stratigraphic integrity of the deposit demonstrated by artefact refits and by optical dating and other analyses of the sediments...
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28722117/a-single-probe-heat-pulse-method-for-estimating-sap-velocity-in%C3%A2-trees
#8
Álvaro López-Bernal, Luca Testi, Francisco J Villalobos
Available sap flow methods are still far from being simple, cheap and reliable enough to be used beyond very specific research purposes. This study presents and tests a new single-probe heat pulse (SPHP) method for monitoring sap velocity in trees using a single-probe sensor, rather than the multi-probe arrangements used up to now. Based on the fundamental conduction-convection principles of heat transport in sapwood, convective velocity (Vh ) is estimated from the temperature increase in the heater after the application of a heat pulse (ΔT)...
July 19, 2017: New Phytologist
https://www.readbyqxmd.com/read/28721492/peristaltic-like-motion-of-the-human-fetal-right-ventricle-and-its-effects-on-fluid-dynamics-and-energy-dynamics
#9
Hadi Wiputra, Guat Ling Lim, Khong Chun Chua, R Nivetha, Sanah Merchant Soomar, Arijit Biwas, Citra Nurfarah Zaini Mattar, Hwa Liang Leo, Choon Hwai Yap
In both adult human and canine, the cardiac right ventricle (RV) is known to exhibit a peristaltic-like motion, where RV sinus (inflow region) contracts first and the infundibulum (outflow region) later, in a wave-like contraction motion. The delay in contraction between the sinus and infundibulum averaged at 15% of the cardiac cycle and was estimated to produce an intra-ventricular pressure difference of 15 mmHg. However, whether such a contractile motion occurs in human fetuses as well, its effects on hemodynamics remains unknown, and are the subject of the current study...
July 18, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28720523/sensory-attenuation-of-self-initiated-sounds-maps-onto-habitual-associations-between-motor-action-and-sound
#10
Nathan G Mifsud, Thomas J Whitford
Sensory attenuation refers to reduced brain responses to self-initiated sensations relative to those produced by the external world, a distinction that is vital for dynamic motor control and our sense of agency. Typically, willed vocalizations elicit larger N1 reduction of the auditory evoked potential compared to indirectly evoked sounds, such as tones generated by button-presses, which is attributed to the prediction and cancellation of incoming signals enabled by speech motor commands. However, physical confounds exist, including different stimuli and the increased motor artefact associated with mouth vs...
July 15, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28716683/trimmed-autocalibrating-k-space-estimation-based-on-structured-matrix-completion
#11
Mark Bydder, Stanislas Rapacchi, Olivier Girard, Maxime Guye, Jean-Philippe Ranjeva
PURPOSE: Parallel imaging allows the reconstruction of undersampled data from multiple coils. This provides a means to reject and regenerate corrupt data (e.g. from motion artefact). The purpose of this work is to approach this problem using the SAKE parallel imaging method. THEORY AND METHODS: Parallel imaging methods typically require calibration by fully sampling the center of k-space. This is a challenge in the presence of corrupted data, since the calibration data may be corrupted which leads to an errors-in-variables problem that cannot be solved by least squares or even iteratively reweighted least squares...
July 15, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28710583/prototype-metal-artefact-reduction-algorithm-in-flat-panel-computed-tomography-evaluation-in-patients-undergoing-transarterial-hepatic-radioembolisation
#12
Qeumars Mustafa Hamie, Adrian Raoul Kobe, Leif Mietzsch, Michael Manhart, Gilbert Dominique Puippe, Thomas Pfammatter, Roman Guggenberger
OBJECTIVE: To investigate the effect of an on-site prototype metal artefact reduction (MAR) algorithm in cone-beam CT-catheter-arteriography (CBCT-CA) in patients undergoing transarterial radioembolisation (RE) of hepatic masses. METHODS AND MATERIALS: Ethical board approved retrospective study of 29 patients (mean 63.7±13.7 years, 11 female), including 16 patients with arterial metallic coils, undergoing CBCT-CA (8s scan, 200 degrees rotation, 397 projections)...
July 14, 2017: European Radiology
https://www.readbyqxmd.com/read/28709122/tms-evoked-long-lasting-artefacts-a-new-adaptive-algorithm-for-eeg-signal-correction
#13
Elias P Casula, Alessandra Bertoldo, Vincenza Tarantino, Michele Maiella, Giacomo Koch, John C Rothwell, Gianna M Toffolo, Patrizia S Bisiacchi
OBJECTIVE: During EEG the discharge of TMS generates a long-lasting decay artefact (DA) that makes the analysis of TMS-evoked potentials (TEPs) difficult. Our aim was twofold: (1) to describe how the DA affects the recorded EEG and (2) to develop a new adaptive detrend algorithm (ADA) able to correct the DA. METHODS: We performed two experiments testing 50 healthy volunteers. In experiment 1, we tested the efficacy of ADA by comparing it with two commonly-used independent component analysis (ICA) algorithms...
June 17, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28707782/exchanging-implements-the-micro-materialities-of-multidisciplinary-work-in-the-operating-theatre
#14
Christian Heath, Paul Luff, Marcus Sanchez-Svensson, Maxim Nicholls
Surgical procedures rely upon an array of commonplace tools, implements and materials that mediate practice and disciplinary collaboration within the operating theatre. Substantial time is dedicated to the issue and provision of these artefacts and their timely exchange is critical to the successful accomplishment of surgical procedures. In this article, we consider the practice, knowledge and agency that informs how particular implements and materials are passed by the scrub nurse to the surgeon that in turn enables their deployment with regard to the particular procedure and the contingencies 'at hand'...
July 14, 2017: Sociology of Health & Illness
https://www.readbyqxmd.com/read/28701729/bias-in-recent-mirbase-annotations-potentially-associated-with-rna-quality-issues
#15
Nicole Ludwig, Meike Becker, Timo Schumann, Timo Speer, Tobias Fehlmann, Andreas Keller, Eckart Meese
Although microRNAs are supposed to be stable in-vivo, degradation processes potentially blur our knowledge on the small oligonucleotides. We set to quantify the effect of degradation on microRNAs in mouse to identify causes for distorted microRNAs patterns. In liver, we found 298, 99 and 8 microRNAs whose expression significantly correlated to RNA integrity, storage time at room temperature and storage time at 4 °C, respectively. Expression levels of 226 microRNAs significantly differed between liver samples with high RNA integrity compared to liver samples with low RNA integrity by more than two-fold...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28701181/fastq_brew-module-for-analysis-preprocessing-and-reformatting-of-fastq-sequence-data
#16
Damien M O'Halloran
BACKGROUND: Next generation sequencing datasets are stored as FASTQ formatted files. In order to avoid downstream artefacts, it is critical to implement a robust preprocessing protocol of the FASTQ sequence in order to determine the integrity and quality of the data. RESULTS: Here I describe fastQ_brew which is a package that provides a suite of methods to evaluate sequence data in FASTQ format and efficiently implements a variety of manipulations to filter sequence data by size, quality and/or sequence...
July 12, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28699261/npq-t-a-chlorophyll-fluorescence-parameter-for-rapid-estimation-and-imaging-of-non-photochemical-quenching-of-excitons-in-photosystem-ii-associated-antenna-complexes
#17
Stefanie Tietz, Christopher C Hall, Jeffrey A Cruz, David M Kramer
In photosynthesis, light energy is absorbed by light-harvesting complexes and used to drive photochemistry. However, a fraction of absorbed light is lost to non-photochemical quenching (NPQ) that reflects several important photosynthetic processes to dissipate excess energy. Currently, estimates of NPQ and its individual components (qE , qI , qZ and qT ) are measured from pulse-amplitude-modulation (PAM) measurements of chlorophyll fluorescence yield and require measurements of the maximal yield of fluorescence in fully dark-adapted material (Fm ), when NPQ is assumed to be negligible...
August 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28698944/petra-msvat-space-and-semac-sequences-for-metal-artefact-reduction-in-dental-mr-imaging
#18
Tim Hilgenfeld, Marcel Prager, Alexander Heil, Franz Sebastian Schwindling, Mathias Nittka, David Grodzki, Peter Rammelsberg, Martin Bendszus, Sabine Heiland
OBJECTIVES: Dental MRI is often impaired by artefacts due to metallic dental materials. Several sequences were developed to reduce susceptibility artefacts. Here, we evaluated a set of sequences for artefact reduction for dental MRI for the first time. METHODS: Artefact volume, signal-to-noise ratio (SNR) and image quality were assessed on a 3-T MRI for pointwise encoding time reduction with radial acquisition (PETRA), multiple-slab acquisition with view angle tilting gradient, based on a sampling perfection with application-optimised contrasts using different flip angle evolution (SPACE) sequence (MSVAT-SPACE), slice-encoding for metal-artefact correction (SEMAC) and compared to a standard SPACE and a standard turbo-spin-echo (TSE) sequence...
July 11, 2017: European Radiology
https://www.readbyqxmd.com/read/28697768/identifying-inequitable-healthcare-in-older-people-systematic-review-of-current-research-practice
#19
REVIEW
Sarah M Salway, Nick Payne, Melanie Rimmer, Stefanie Buckner, Hannah Jordan, Jean Adams, Kate Walters, Sarah L Sowden, Lynne Forrest, Linda Sharp, Mira Hidajat, Martin White, Yoav Ben-Shlomo
BACKGROUND: There is growing consensus on the importance of identifying age-related inequities in the receipt of public health and healthcare interventions, but concerns regarding conceptual and methodological rigour in this area of research. Establishing age inequity in receipt requires evidence of a difference that is not an artefact of poor measurement of need or receipt; is not warranted on the grounds of patient preference or clinical safety; and is judged to be unfair. METHOD: A systematic, thematic literature review was undertaken with the objective of characterising recent research approaches...
July 11, 2017: International Journal for Equity in Health
https://www.readbyqxmd.com/read/28696007/comparison-of-conventional-cytology-and-surepath-in-split-thyroid-fine-needle-aspiration-materials
#20
D Sahin, D Yilmazbayhan, P Firat, U P Hacisalihoglu, S H Kirimlioglu, E Celenk, R Arslan
OBJECTIVE: The aim of the present study was to compare the cytomorphological features and cytopathological diagnoses in thyroid aspiration materials prepared by SurePath® (SP) and conventional cytology (CC). MATERIALS AND METHODS: Fine needle aspiration (FNA) materials from 180 thyroid nodules were divided into two groups to prepare three conventional smears and one SP slide. Twenty-nine cytomorphological features of thyroid lesions were compared in the CC and SP slides...
July 11, 2017: Cytopathology: Official Journal of the British Society for Clinical Cytology
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