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https://www.readbyqxmd.com/read/29346297/the-dynamic-performance-of-flexural-ultrasonic-transducers
#1
Andrew Feeney, Lei Kang, George Rowlands, Steve Dixon
Flexural ultrasonic transducers are principally used as proximity sensors and for industrial metrology. Their operation relies on a piezoelectric ceramic to generate a flexing of a metallic membrane, which delivers the ultrasound signal. The performance of flexural ultrasonic transducers has been largely limited to excitation through a short voltage burst signal at a designated mechanical resonance frequency. However, a steady-state amplitude response is not generated instantaneously in a flexural ultrasonic transducer from a drive excitation signal, and differences in the drive characteristics between transmitting and receiving transducers can affect the measured response...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29343739/qualitative-systematic-review-of-barriers-and-facilitators-to-self-management-of-chronic-obstructive-pulmonary-disease-views-of-patients-and-healthcare-professionals
#2
REVIEW
Siân Russell, Oladapo J Ogunbayo, James J Newham, Karen Heslop-Marshall, Paul Netts, Barbara Hanratty, Fiona Beyer, Eileen Kaner
Self-management interventions for chronic obstructive pulmonary disease (COPD) can improve quality of life, reduce hospital admissions, and improve symptoms. However, many factors impede engagement for patients and practitioners. Qualitative research, with its focus on subjective experience, can provide invaluable insights into such factors. Therefore, a systematic review and synthesis of qualitative evidence on COPD self-management from the perspective of patients, carers, and practitioners was conducted. Following a systematic search and screening, 31 studies were appraised and data extracted for analysis...
January 17, 2018: NPJ Primary Care Respiratory Medicine
https://www.readbyqxmd.com/read/29338881/infiltration-behaviour-of-elemental-mercury-dnapl-in-fully-and-partially-water-saturated-porous-media
#3
Andrea D'Aniello, Niels Hartog, Thomas Sweijen, Domenico Pianese
Mercury is a contaminant of global concern due to its harmful effects on human health and for the detrimental consequences of its release in the environment. Sources of liquid elemental mercury are usually anthropogenic, such as chlor-alkali plants. To date insight into the infiltration behaviour of liquid elemental mercury in the subsurface is lacking, although this is critical for assessing both characterization and remediation approaches for mercury DNAPL contaminated sites. Therefore, in this study the infiltration behaviour of elemental mercury in fully and partially water saturated systems was investigated using column experiments...
January 8, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29335556/thermodynamic-insight-into-stimuli-responsive-behaviour-of-soft-porous-crystals
#4
L Vanduyfhuys, S M J Rogge, J Wieme, S Vandenbrande, G Maurin, M Waroquier, V Van Speybroeck
Knowledge of the thermodynamic potential in terms of the independent variables allows to characterize the macroscopic state of the system. However, in practice, it is difficult to access this potential experimentally due to irreversible transitions that occur between equilibrium states. A showcase example of sudden transitions between (meta)stable equilibrium states is observed for soft porous crystals possessing a network with long-range structural order, which can transform between various states upon external stimuli such as pressure, temperature and guest adsorption...
January 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29335280/mapping-protein-interactions-of-sodium-channel-nav1-7-using-epitope-tagged-gene-targeted-mice
#5
Alexandros H Kanellopoulos, Jennifer Koenig, Honglei Huang, Martina Pyrski, Queensta Millet, Stéphane Lolignier, Toru Morohashi, Samuel J Gossage, Maude Jay, John E Linley, Georgios Baskozos, Benedikt M Kessler, James J Cox, Annette C Dolphin, Frank Zufall, John N Wood, Jing Zhao
The voltage-gated sodium channel NaV1.7 plays a critical role in pain pathways. We generated an epitope-tagged NaV1.7 mouse that showed normal pain behaviours to identify channel-interacting proteins. Analysis of NaV1.7 complexes affinity-purified under native conditions by mass spectrometry revealed 267 proteins associated with Nav1.7 in vivo The sodium channel β3 (Scn3b), rather than the β1 subunit, complexes with Nav1.7, and we demonstrate an interaction between collapsing-response mediator protein (Crmp2) and Nav1...
January 15, 2018: EMBO Journal
https://www.readbyqxmd.com/read/29334317/fluctuation-a-common-but-neglected-pattern-of-physical-activity-behaviour-an-exploratory-review-of-studies-in-recent-20-years
#6
Borui Shang, Yanping Duan, Wendy Yajun Huang, Walter Brehm
BACKGROUND: Regular physical activity (PA) is beneficial for physical and psychological well-being, yet many people do not achieve these health benefits due to irregular PA participation which is also known as fluctuation. Limited attention has been given to the phenomenon of fluctuation in the PA behaviour literature. OBJECTIVE: The aim of this review was to explore and to map definitions, measurements, behavioural evidence, and factors related to PA fluctuation...
January 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29332951/soil-seal-development-under-simulated-rainfall-structural-physical-and-hydrological-dynamics
#7
Elena Armenise, Robert W Simmons, Sujung Ahn, Amin Garbout, Stefan H Doerr, Sacha J Mooney, Craig J Sturrock, Karl Ritz
This study delivers new insights into rainfall-induced seal formation through a novel approach in the use of X-ray Computed Tomography (CT). Up to now seal and crust thickness have been directly quantified mainly through visual examination of sealed/crusted surfaces, and there has been no quantitative method to estimate this important property. X-ray CT images were quantitatively analysed to derive formal measures of seal and crust thickness. A factorial experiment was established in the laboratory using open-topped microcosms packed with soil...
January 2018: Journal of Hydrology
https://www.readbyqxmd.com/read/29331879/structural-and-quantum-mechanical-computations-to-elucidate-the-altered-binding-mechanism-of-metal-and-drug-with-pyrazinamidase-from-mycobacterium-tuberculosis-due-to-mutagenicity
#8
Nouman Rasool, Saima Iftikhar, Anam Amir, Waqar Hussain
Pyrazinamide is known to be the most effective treatment against tuberculosis disease and is known to have bacteriostatic action. By targeting the bacterial spores, this drug reduces the chances for the progression of the infection in organisms. In recent years, increased instances of the drug resistance of bacterial strains are reported. Pyrazinamidase, activator for pyrazinamide, leads to resistance against the drug due to mutagenicity across the world. The present study aimed at the quantum mechanistic analysis of mutations in pyrazinamidase to gain insights into the mechanism of this enzyme...
December 24, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29330362/dynamic-modelling-of-the-mtor-signalling-network-reveals-complex-emergent-behaviours-conferred-by-deptor
#9
Thawfeek M Varusai, Lan K Nguyen
The mechanistic Target of Rapamycin (mTOR) signalling network is an evolutionarily conserved network that controls key cellular processes, including cell growth and metabolism. Consisting of the major kinase complexes mTOR Complex 1 and 2 (mTORC1/2), the mTOR network harbours complex interactions and feedback loops. The DEP domain-containing mTOR-interacting protein (DEPTOR) was recently identified as an endogenous inhibitor of both mTORC1 and 2 through direct interactions, and is in turn degraded by mTORC1/2, adding an extra layer of complexity to the mTOR network...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29328973/feeding-inhibition-in-corbicula-fluminea-o-f-muller-1774-as-an-effect-criterion-to-pollutant-exposure-perspectives-for-ecotoxicity-screening-and-refinement-of-chemical-control
#10
Bruno Branco Castro, Carlos Silva, Inês Patrunilho Efe Macário, Bruno Oliveira, Fernando Gonçalves, Joana Luísa Pereira
Bivalves are commonly used in biomonitoring programs to track pollutants. Several features, including its filter-feeding abilities, cumulatively argue in favour of the use of the Asian clam (Corbicula fluminea) as a biosentinel and an ecotoxicological model. Filtration in bivalves is very sensitive to external stimuli and its control is dictated by regulation of the opening/closure of the valves, which may be used as an avoidance defence against contaminants. Here, we investigate the filter-feeding behaviour of the Asian clam as an endpoint for assessing exposure to pollutants, driven by two complementary goals: (i) to generate relevant and sensitive toxicological information based on the ability of C...
January 4, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29328058/behaviour-of-niobium-during-early-earth-s-differentiation-insights-from-its-local-structure-and-oxidation-state-in-silicate-melts-at-high-pressure
#11
Chrystele Sanloup, Benjamin Cochain, Charlotte de Grouchy, Konstantin Glazyrin, Zuzana Konopkova, Hanns-Peter Liermann, Innokenty Kantor, Raffaella Torchio, O Mathon, Tetsuo Irifune
Niobium (Nb) is one of the key trace elements used to understand Earth's formation and differentiation, and is remarkable for its deficiency relative to tantalum in terrestrial rocks compared to the building chondritic blocks. In this context, the local environment of Nb in silica-rich melts and glasses is studied by in situ X-ray absorption spectroscopy (XAS) at high pressure (P) up to 9.3 GPa and 1350 K using resistive-heating diamond-anvil cells. Nb is slightly less oxidized in the melt (intermediate valence between +4 and +5) than in the glass (+5), an effect evidenced from the shift of the Nb-edge towards lower energies...
January 12, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29327006/spectrochemical-analyses-of-growth-phase-related-bacterial-responses-to-low-environmentally-relevant-concentrations-of-tetracycline-and-nanoparticulate-silver
#12
Naifu Jin, Kirk T Semple, Longfei Jiang, Chunling Luo, Dayi Zhang, Francis L Martin
Exposure to environmental insults generally occurs at low levels, making it challenging to measure bacterial responses to such interactions. Additionally, microbial behaviour and phenotype varies in differing bacterial types or growth phases, likely giving rise to growth- or species-specific responses to environmental stimuli. The present study applied a spectrochemical tool, infrared (IR) spectral interrogation coupled with multivariate analysis, to investigate the growth- and species-specific responses of two bacterial strains, Gram-negative Pseudomonas fluorescens and Gram-positive Mycobacterium vanbaalenii, to low concentrations of tetracycline, nanoparticulate silver (AgNP) or mixtures thereof...
January 12, 2018: Analyst
https://www.readbyqxmd.com/read/29326466/a-study-of-oral-health-prevention-behaviours-for-patients-with-early-stage-dementia
#13
R Emanuel, A Sorensen
Background Thorough dental prevention provided at the diagnosis of early stage dementia may be able to reduce the risk of dental disease before the associated cognitive decline takes hold.Method A questionnaire was used to see how many patients with a recent diagnosis of dementia were registered with a dentist and if they were accessing preventative dental care. The questionnaire was administered to patients attending Memory Assessment Services (MAS), approximately ten weeks after initial diagnosis. A similar questionnaire was conducted among MAS staff providing insight into their own personal dental care knowledge and behaviours...
January 12, 2018: British Dental Journal
https://www.readbyqxmd.com/read/29325470/the-effect-of-shorter-exposure-versus-prolonged-exposure-on-treatment-outcome-in-tourette-syndrome-and-chronic-tic-disorders-an-open-trial
#14
Jolande M T M van de Griendt, Maarten K van Dijk, Cara W J Verdellen, Marc J P M Verbraak
BACKGROUND: Exposure and response prevention has shown to be an effective strategy and is considered a first-line intervention in the behavioural treatment of tic disorders. Prior research demonstrated significant tic reduction after 12 two hour sessions. OBJECTIVE: In this open trial, the question is addressed whether, relative to these prolonged sessions, exposure sessions of shorter duration yield differential outcome for patients with tic disorders. METHODS: A total of 29 patients diagnosed with Tourette syndrome (TS) or chronic tic disorder were treated with shorter exposure sessions (1 h), and these data were compared to the data from a study about prolonged exposure (2 h, n = 21)...
January 11, 2018: International Journal of Psychiatry in Clinical Practice
https://www.readbyqxmd.com/read/29324831/the-plantlibra-consumer-survey-findings-on-the-use-of-plant-food-supplements-in-italy
#15
Patrizia Restani, Chiara Di Lorenzo, Alicia Garcia-Alvarez, Gianfranco Frigerio, Francesca Colombo, Franco M Maggi, Raimon Milà-Villarroel, Lluis Serra-Majem
BACKGROUND: Food supplements, and in particular those containing botanicals (plant food supplements, PFS), have in recent decades been of great interest both to consumers and to food/pharmaceutical industries. OBJECTIVES: The aim of this paper is to examine replies by Italian consumers to the PlantLIBRA consumers' survey in order to: 1) assess the behaviour of an Italian population with respect to the use of PFS, and to compare it with that of other 5 countries involved in the whole survey; 2) identify different habits in the 4 Italian cities selected according to their geographical distribution; 3) collect independent information on the actual intake of PFS and consumers' behaviour...
2018: PloS One
https://www.readbyqxmd.com/read/29322329/in-vitro-validation-of-a-numerical-simulation-of-leaflet-kinematics-in-a-polymeric-aortic-valve-under-physiological-conditions
#16
Saleh Hassanzadeh Gharaie, Bobak Mosadegh, Yosry Morsi
This paper describes a computational method to simulate the non-linear structural deformation of a polymeric aortic valve under physiological conditions. Arbitrary Lagrangian-Eulerian method is incorporated in the fluid-structure interaction simulation, and then validated by comparing the predicted kinematics of the valve's leaflets to in vitro measurements on a custom-made polymeric aortic valve. The predicted kinematics of the valve's leaflets was in good agreement with the experimental results with a maximum error of 15% in a single cardiac cycle...
January 10, 2018: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29321474/magnetisation-process-in-the-rare-earth-tetraborides-ndb4-and-hob4
#17
D Brunt, G Balakrishnan, D A Mayoh, M R Lees, D Gorbunov, N Qureshi, O A Petrenko
A field-induced magnetisation process in the frustrated antiferromagnets is often much richer compared to the materials without competing interactions. The applied field tends to stabilise unusual spin configurations which frequently results in the appearance of magnetisation plateaux. Here we report a study into the field-induced magnetisation of the two frustrated rare earth tetraborides, HoB4 and NdB4. NdB4 shows a fractional magnetisation plateau occurring at M/M sat ≈ [Formula: see text] before saturating in a field of 33 kOe...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29319705/structure-thermodynamics-and-rearrangement-mechanisms-in-gold-clusters-insights-from-the-energy-landscapes-framework
#18
D Schebarchov, F Baletto, D J Wales
We consider finite-size and temperature effects on the structure of model AuN clusters (30 ≤ N ≤ 147) bound by the Gupta potential. Equilibrium behaviour is examined in the harmonic superposition approximation, and the size-dependent melting temperature is also bracketed using molecular dynamics simulations. We identify structural transitions between distinctly different morphologies, characterised by various defect features. Reentrant behaviour and trends with respect to cluster size and temperature are discussed in detail...
January 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/29317439/emergency-departments-and-minor-illness-some-behavioural-insights
#19
EDITORIAL
Mando Watson, Mitch Blair
No abstract text is available yet for this article.
January 9, 2018: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/29317242/cholesterol-supplementation-improves-growth-rates-of-histomonas-meleagridis-in-vitro
#20
Janine Gruber, Alena Pletzer, Michael Hess
Research on the energy metabolism of various protozoan parasites showed the essentiality and benefits of cholesterol in the cultivation of these organisms. However, not much is known about the energy metabolism of Histomonas meleagridis, although such information is of high importance to improve cultivation of the parasite for advancements in diagnostics, research and vaccine development. By supplementing a serum enriched cultivation medium with cholesterol, numbers of parasites could be doubled in comparison to unsupplemented negative controls...
January 6, 2018: Experimental Parasitology
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