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https://www.readbyqxmd.com/read/28926270/an-ultra-thin-nanoporous-membrane-evaporator
#1
Zhengmao Lu, Kyle L Wilke, Daniel John Preston, Ikuya Kinefuchi, Elizabeth F Chang-Davidson, Evelyn N Wang
Evaporation is a ubiquitous phenomenon found in nature and widely used in industry. Yet fundamental understanding of interfacial transport during evaporation remains limited to date owing to the difficulty of characterizing the heat and mass transfer at the interface, especially at high heat fluxes ( > 100 W/cm(2)). In this work, we elucidated evaporation into an air ambient with an ultra-thin (≈ 200 nm thick) nanoporous (≈ 130 nm pore diameter) membrane. With our evaporator design, we accurately monitored the temperature of the liquid-vapor interface, reduced the thermal-fluidic transport resistance and mitigated the clogging risk associated with contamination...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28920186/investigation-of-cis-trans-isomer-dependent-dermatotoxicokinetics-of-uv-filter-ethylhexyl-methoxycinnamate-through-stratum-corneum-in-vivo
#2
Anežka Sharma, Katarína Bányiová, Branislav Vrana, Ivan Justan, Pavel Čupr
2-Ethylhexyl methoxycinnamate (EHMC) is one of the most used ultraviolet filters in personal care products. It undergoes cis/trans isomerization in sunlight, and there is limited toxicological understanding of the effects of the cis-isomer. It is known that two geometric isomers of one compound can have different physico-chemical properties and effects. However, there are no studies focusing on toxicokinetics of EHMC isomerization products to compare their potential difference in dermal exposure to cis-EHMC and trans-EHMC due to the difference in their dermatotoxicokinetics...
September 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28917121/a-formal-description-of-middle-ear-pressure-regulation
#3
William J Doyle
INTRODUCTION: Middle ear (ME) pressure-regulation (MEPR) is a homeostatic mechanism that maintains the ME-environment pressure-gradient (MEEPG) within a range optimized for "normal" hearing. OBJECTIVE: Describe MEPR using equations applicable to passive, inter-compartmental gas-exchange and determine if the predictions of that description include the increasing ME pressure observed under certain conditions and interpreted by some as evidencing gas-production by the ME mucosa...
August 24, 2017: Hearing Research
https://www.readbyqxmd.com/read/28898586/transcerebral-net-exchange-of-vasoactive-peptides-and-catecholamines-during-lipopolysaccharide-induced-systemic-inflammation-in-healthy-humans
#4
Ronan M G Berg, Sarah Taudorf, Damian Miles Bailey, Rasmus Holmboe Dahl, Carsten Lundby, Kirsten Møller
The systemic inflammatory response triggered by lipopolysaccharide (LPS) is associated with cerebral vasoconstriction, but the underlying mechanisms are unknown. We therefore examined whether a four-hour intravenous LPS infusion (0.3 ng kg<sup>-1</sup>) induces any changes in the transcerebral net exchange of the vasoactive peptides endothelin-1 (ET-1) and calcitonin-gene related peptide (CGRP) and catecholamines in human volunteers. Cerebral blood flow was measured by the Kety-Schmidt technique, and paired arterial-to-jugular venous blood samples were obtained for estimating the transcerebral exchange of ET-1, CGRP and catecholamines by the Fick principle in twelve volunteers before and after LPS...
September 12, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28878185/effects-of-hyporheic-water-fluxes-and-sediment-grain-size-on-the-concentration-and-diffusive-flux-of-heavy-metals-in-the-streambed
#5
Qi Liu, Jinxi Song, Guotao Zhang, Weize Wang, Weiqiang Guo, Bin Tang, Feihe Kong, Aidi Huo
The hyporheic zone regulates physicochemical processes in surface-groundwater systems and can be an important source of heavy metals in fluvial systems. This study assesses the pore water concentrations and diffusive fluxes of heavy metals with respect to the vertical water exchange flux (VWEF) and sediment grain size. Water and sediment samples were collected on August 2016 from upstream Site 1 and downstream Site 2 along the Juehe River in Shaanxi Province, China. Streambed vertical hydraulic conductivity (Kv) and the VWEF were estimated via the standpipe permeameter test method and Darcy's law...
September 6, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28877293/thermodilution-vs-estimated-fick-cardiac-output-measurement-in-clinical-practice-an-analysis-of-mortality-from-the-veterans-affairs-clinical-assessment-reporting-and-tracking-va-cart-program-and-vanderbilt-university
#6
Alexander R Opotowsky, Edward Hess, Bradley A Maron, Evan L Brittain, Anna E Barón, Thomas M Maddox, Laith I Alshawabkeh, Bradley M Wertheim, Meng Xu, Tufik R Assad, Jonathan D Rich, Gaurav Choudhary, Ryan J Tedford
Importance: Thermodilution (Td) and estimated oxygen uptake Fick (eFick) methods are widely used to measure cardiac output (CO). They are often used interchangeably to make critical clinical decisions, yet few studies have compared these approaches as applied in medical practice. Objectives: To assess agreement between Td and eFick CO and to compare how well these methods predict mortality. Design, Setting, and Participants: This investigation was a retrospective cohort study with up to 1 year of follow-up...
September 6, 2017: JAMA Cardiology
https://www.readbyqxmd.com/read/28863993/impact-of-shear-stress-and-impeller-design-on-the-production-of-biogas-in-anaerobic-digesters
#7
Aline Lebranchu, Stéphane Delaunay, Philippe Marchal, Fabrice Blanchard, Stéphane Pacaud, Michel Fick, Eric Olmos
Today, intensification of anaerobic digestion is still a scientific and technical challenge. The present study proposed combined experimental and computational fluid dynamics simulations to characterize the impact of shear stress and impeller design on the biogas production after sequential additions of substrate. Liquid phase (cattle manure digestate) rheological law was experimentally determined and input in numerical simulations. The results showed that the original use of a double helical ribbon in digester allowed a significantly faster dispersion of fresh substrate than the use of a classical Rushton turbine, leading to a 50% higher methane production rate...
July 23, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28856352/letter-to-the-editor-pronator-teres-myotendinous-tear
#8
Brooks W Ficke, Brent A Ponce
No abstract text is available yet for this article.
July 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28844632/patient-dissatisfaction-following-total-knee-arthroplasty-a-systematic-review-of-the-literature
#9
Rajitha Gunaratne, Dylan N Pratt, Joseph Banda, Daniel P Fick, Riaz J K Khan, Brett W Robertson
BACKGROUND: Dissatisfaction following total knee arthroplasty (TKA) is common. Approximately 20% of patients report dissatisfaction following primary TKA. This systematic literature review explores key factors affecting patient dissatisfaction following TKA. METHODS: Six literature databases published between 2005 and 1 January 2016 were searched using 3 key search phrases. Papers were included if the study investigated patient dissatisfaction in primary unilateral or bilateral TKA...
July 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28841218/when-it-comes-to-older-adults-language-matters
#10
EDITORIAL
Donna M Fick, Nancy E Lundebjerg
No abstract text is available yet for this article.
September 1, 2017: Journal of Gerontological Nursing
https://www.readbyqxmd.com/read/28839102/the-beginnings-of-cardiac-catheterization-and-the-resulting-impact-on-pulmonary-medicine
#11
John B West
The early history of cardiac catheterization has many interesting features. First, although it would be natural to assume that the procedure was initiated by cardiologists, two of the three people who shared the Nobel Prize for the discovery were pulmonologists, while the third was a urologist. The primary objective of the pulmonologists, André Cournand and Dickinson Richards, was to obtain mixed venous blood from the right heart so that they could use to use the Fick principle to calculate total pulmonary blood flow...
August 24, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28831765/validation-of-transpulmonary-thermodilution-variables-in-hemodynamically-stable-patients-with-heart-diseases
#12
Matthias Peter Hilty, Daniel Peter Franzen, Christophe Wyss, Patric Biaggi, Marco Maggiorini
BACKGROUND: Transpulmonary thermodilution is recommended in the treatment of critically ill patients presenting with complex shock. However, so far it has not been validated in hemodynamically stable patients with heart disease. METHODS: We assessed the validity of cardiac output, global end-diastolic volume index (GEDVI), an established marker of preload thought to reflect the volume of all four heart chambers, global ejection fraction (GEF) and cardiac function index (CFI) as variables of cardiac function, and extravascular lung water index (EVLWI) as indicator of pulmonary edema in 29 patients undergoing elective left and right heart catheterization including left ventricular angiography with stable coronary heart disease and normal cardiac function (controls, n = 11), moderate-to-severe aortic valve stenosis (AS, n = 10), or dilated cardiomyopathy (DCM, n = 8)...
August 22, 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28831004/hydrodynamic-and-entropic-effects-on-colloidal-diffusion-in-corrugated-channels
#13
Xiang Yang, Chang Liu, Yunyun Li, Fabio Marchesoni, Peter Hänggi, H P Zhang
In the absence of advection, confined diffusion characterizes transport in many natural and artificial devices, such as ionic channels, zeolites, and nanopores. While extensive theoretical and numerical studies on this subject have produced many important predictions, experimental verifications of the predictions are rare. Here, we experimentally measure colloidal diffusion times in microchannels with periodically varying width and contrast results with predictions from the Fick-Jacobs theory and Brownian dynamics simulation...
August 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28829722/environmental-relevant-levels-of-a-benzodiazepine-oxazepam-alters-important-behavioral-traits-in-a-common-planktivorous-fish-rutilus-rutilus
#14
Tomas Brodin, Johanna Nordling, Annelie Lagesson, Jonatan Klaminder, Gustav Hellström, Bent Christensen, Jerker Fick
Environmental pollution by pharmaceuticals is increasingly recognized as a major threat to aquatic ecosystems worldwide. A complex mix of pharmaceuticals enters waterways via treated wastewater effluent and many remain biochemically active after the drugs reach aquatic systems. However, to date little is known regarding the ecological effects that might arise following pharmaceutical contamination of aquatic environments. One group of particular concern is behaviorally modifying pharmaceuticals as seemingly minor changes in behavior may initiate marked ecological consequences...
August 22, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28825984/bioaccumulation-of-psychoactive-pharmaceuticals-in-fish-in-an-effluent-dominated-stream
#15
Katerina Grabicova, Roman Grabic, Ganna Fedorova, Jerker Fick, Daniel Cerveny, Jitka Kolarova, Jan Turek, Vladimir Zlabek, Tomas Randak
The treated effluent from sewage treatment plants (STP) is a major source of active pharmaceutical ingredients (APIs) that enter the aquatic environment. Bioaccumulation of 11 selected psychoactive pharmaceuticals (citalopram, clomipramine, haloperidol, hydroxyzine, levomepromazine, mianserin, mirtazapine, paroxetine, sertraline, tramadol and venlafaxine) was examined in Zivny Stream (tributary of the Blanice River, the Czech Republic), which is a small stream highly affected by effluent from the Prachatice STP...
August 8, 2017: Water Research
https://www.readbyqxmd.com/read/28800324/fluid-in-the-tissue-channels-of-vascular-adventitia-investigated-by-afm-and-tem
#16
Xinxiao Han, Hongyi Li, Wenda Hua, Luru Dai, Zhuo Ao, Fulong Liao, Dong Han
BACKGROUND: Tissue channels as a part of microcirculation system have been proposed over three decade, playing an important role in fluid transportation as reported. Adventitia of inferior vena cava (IVC) is a typical hierarchical porous media with abundant tissue channels. Its fluid transportation behaviors attract massive research interest. However, the mechanism of the driving force and microstructure was lack of deep research. OBJECTIVE: This study was to investigate the microstructural basis of fluid transportation within inferior vena cava (IVC)...
August 11, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28782304/primary-treatment-for-oropharyngeal-squamous-cell-carcinoma-in-alberta-canada-a-population-based-study
#17
Amy J Hobbs, Nigel T Brockton, T Wayne Matthews, Shamir P Chandarana, Pinaki Bose, Kelly Guggisberg, Gordon H Fick, Joseph C Dort
BACKGROUND: The incidence of human papillomavirus (HPV)-related oropharyngeal squamous cell carcinoma (SCC) is increasing and has better survival than non-HPV related oropharyngeal SCC. This study compared surgical to nonsurgical treatments and demographic, clinical, and survival differences in patients with oropharyngeal SCC, stratified by p16 status. METHODS: We assembled a cohort of adult patients with oropharyngeal SCC diagnosed between 2000 and 2008 in Alberta...
August 7, 2017: Head & Neck
https://www.readbyqxmd.com/read/28764343/generalized-model-for-the-diffusion-of-solvents-in-glassy-polymers-from-fickian-to-super-case-ii
#18
Jiayuan Miao, Mesfin Tsige, Philip L Taylor
The diffusion of small solvent molecules in glassy polymers may take on a variety of different forms. Fickian, anomalous, Case II and Super Case II diffusion have all been observed, and theoretical models exist that describe each specific type of behavior. Here we present a single generalized kinetic model capable of yielding all these different types of diffusion on the basis of just two parameters. The principal determinant of the type of diffusion is observed to be a dimensionless parameter, γ, that describes the influence of solvent-induced swelling in lowering the potential barriers separating available solvent sites...
July 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28750642/cmr-fluoroscopy-right-heart-catheterization-for-cardiac-output-and-pulmonary-vascular-resistance-results-in-102-patients
#19
Toby Rogers, Kanishka Ratnayaka, Jaffar M Khan, Annette Stine, William H Schenke, Laurie P Grant, Jonathan R Mazal, Elena K Grant, Adrienne Campbell-Washburn, Michael S Hansen, Rajiv Ramasawmy, Daniel A Herzka, Hui Xue, Peter Kellman, Anthony Z Faranesh, Robert J Lederman
BACKGROUND: Quantification of cardiac output and pulmonary vascular resistance (PVR) are critical components of invasive hemodynamic assessment, and can be measured concurrently with pressures using phase contrast CMR flow during real-time CMR guided cardiac catheterization. METHODS: One hundred two consecutive patients underwent CMR fluoroscopy guided right heart catheterization (RHC) with simultaneous measurement of pressure, cardiac output and pulmonary vascular resistance using CMR flow and the Fick principle for comparison...
July 27, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28742518/severe-hypertriglyceridemia-at-new-onset-type-1-diabetes-mellitus
#20
Tyler Fick, Julie Jack, Amy L Pyle-Eilola, Rohan K Henry
BACKGROUND: Severe hypertriglyceridemia (HTG) as well as diabetic ketoacidosis (DKA) are complications of type 1 diabetes (T1DM). HTG is an exceedingly rare complication in the pediatric population and herein we report a case of HTG at new-onset T1DM in DKA and discuss management and potential complications. CASE PRESENTATION: An 11-year-old previously well patient with a history of fatigue and weight loss presented with: glucose >600 mg/dL, venous blood gas: pH 7...
August 28, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
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