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Fluid kinetics

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https://www.readbyqxmd.com/read/27913147/electro-kinetically-driven-peristaltic-transport-of-viscoelastic-physiological-fluids-through-a-finite-length-capillary-mathematical-modelling
#1
Dharmendra Tripathi, Ashu Yadav, O Anwar Bég
Analytical solutions are developed for the electro-kinetic flow of a viscoelastic biological liquid in a finite length cylindrical capillary geometry under peristaltic waves. The Jefferys' non-Newtonian constitutive model is employed to characterize rheological properties of the fluid. The unsteady conservation equations for mass and momentum with electro-kinetic and Darcian porous medium drag force terms are reduced to a system of steady linearized conservation equations in an axisymmetric coordinate system...
November 29, 2016: Mathematical Biosciences
https://www.readbyqxmd.com/read/27911548/phase-controlled-bistability-of-a-dark-soliton-train-in-a-polariton-fluid
#2
V Goblot, H S Nguyen, I Carusotto, E Galopin, A Lemaître, I Sagnes, A Amo, J Bloch
We use a one-dimensional polariton fluid in a semiconductor microcavity to explore the nonlinear dynamics of counterpropagating interacting Bose fluids. The intrinsically driven-dissipative nature of the polariton fluid allows us to use resonant pumping to impose a phase twist across the fluid. When the polariton-polariton interaction energy becomes comparable to the kinetic energy, linear interference fringes transform into a train of solitons. A novel type of bistable behavior controlled by the phase twist across the fluid is experimentally evidenced...
November 18, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27911381/a-novel-approach-for-the-administration-of-medications-and-fluids-in-emergency-scenarios-and-settings
#3
Akilesh Honasoge, Neal Lyons, Kathleen Hesse, Braden Parker, Robert Mokszycki, Kelly Wesselhoff, Rolla Sweis, Erik B Kulstad
The available routes of administration commonly used for medications and fluids in the acute care setting are generally limited to oral, intravenous, or intraosseous routes, but in many patients, particularly in the emergency or critical care settings, these routes are often unavailable or time-consuming to access. A novel device is now available that offers an easy route for administration of medications or fluids via rectal mucosal absorption (also referred to as proctoclysis in the case of fluid administration and subsequent absorption)...
November 9, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910599/synthetic-plasma-edge-diagnostics-for-emc3-eirene-highlighted-for-wendelstein-7-x
#4
H Frerichs, F Effenberg, O Schmitz, C Biedermann, Y Feng, M Jakubowski, R König, M Krychowiak, J Lore, H Niemann, T S Pedersen, L Stephey, G A Wurden
Interpretation of spectroscopic measurements in the edge region of high-temperature plasmas can be a challenge since line of sight integration effects make direct interpretation in terms of quantitative, local emission strengths often impossible. The EMC3-EIRENE code-a 3D fluid edge plasma and kinetic neutral gas transport code-is a suitable tool for full 3D reconstruction of such signals. A versatile synthetic diagnostic module has been developed recently which allows the realistic 3D setup of various plasma edge diagnostics to be captured...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910508/a-particle-x-ray-temporal-diagnostic-pxtd-for-studies-of-kinetic-multi-ion-effects-and-ion-electron-equilibration-rates-in-inertial-confinement-fusion-plasmas-at-omega-invited
#5
H Sio, J A Frenje, J Katz, C Stoeckl, D Weiner, M Bedzyk, V Glebov, C Sorce, M Gatu Johnson, H G Rinderknecht, A B Zylstra, T C Sangster, S P Regan, T Kwan, A Le, A N Simakov, W T Taitano, L Chacòn, B Keenan, R Shah, G Sutcliffe, R D Petrasso
A Particle X-ray Temporal Diagnostic (PXTD) has been implemented on OMEGA for simultaneous time-resolved measurements of several nuclear products as well as the x-ray continuum produced in High Energy Density Plasmas and Inertial Confinement Fusion implosions. The PXTD removes systematic timing uncertainties typically introduced by using multiple instruments, and it has been used to measure DD, DT, D(3)He, and T(3)He reaction histories and the emission history of the x-ray core continuum with relative timing uncertainties within ±10-20 ps...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27906393/geometric-control-of-active-collective-motion
#6
Maxime Theillard, Roberto Alonso-Matilla, David Saintillan
Recent experimental studies have shown that confinement can profoundly affect self-organization in semi-dilute active suspensions, leading to striking features such as the formation of steady and spontaneous vortices in circular domains and the emergence of unidirectional pumping motions in periodic racetrack geometries. Motivated by these findings, we analyze the two-dimensional dynamics in confined suspensions of active self-propelled swimmers using a mean-field kinetic theory where conservation equations for the particle configurations are coupled to the forced Navier-Stokes equations for the self-generated fluid flow...
December 1, 2016: Soft Matter
https://www.readbyqxmd.com/read/27892449/otorrhagia-and-nosebleed-as-first-signs-of-intravascular-absorption-syndrome-during-hysteroscopy-from-bench-to-bedside
#7
V Giacobbe, D Rossetti, S G Vitale, A M C Rapisarda, F Padula, A S Laganà, V I Palmara
Hysteroscopic surgery is indicated for the treatment of several intrauterine diseases. The surgeon needs to be aware of, and know how to prevent, possible complications related to these procedures. In the case of operative hysteroscopy, the systemic effects of low-viscosity fluid uptake must be considered in order to prevent the complications in the patient. We report on two unusual clinical signs of intravascular absorption syndrome (IAS) that developed during an operative hysteroscopy with glycine 1.5% as the fluid of distension...
January 2016: Kathmandu University Medical Journal (KUMJ)
https://www.readbyqxmd.com/read/27891066/in-situ-evaluation-of-calcium-phosphate-nucleation-kinetics-and-pathways-during-intra-and-extrafibrillar-mineralization-of-collagen-matrices
#8
Doyoon Kim, Byeongdu Lee, Stavros Thomopoulos, Young-Shin Jun
We revealed that nucleation sites within collagen fibrils determined pathways for calcium phosphate (CaP) nucleation and its transformation, from amorphous species to crystalline plates, during the biomineralization process. Using in situ small-angle X-ray scattering (SAXS), we examined the nucleation and growth of CaP within collagen matrices and elucidated how a nucleation inhibitor, polyaspartic acid (pAsp), governs mineralization kinetics and pathways at multiple length scales. Mineralization without pAsp led initially to spherical aggregates of CaP in the entire extrafibrillar spaces...
2016: Crystal Growth & Design
https://www.readbyqxmd.com/read/27889614/competitive-replication-kinetics-and-pathogenicity-in-pigs-co-infected-with-historical-and-newly-invading-classical-swine-fever-viruses
#9
Yu-Liang Huang, Ming-Chung Deng, Kuo-Jung Tsai, Hsin-Meng Liu, Chin-Cheng Huang, Fun-In Wang, Chia-Yi Chang
Classical swine fever (CSF), an economically important and highly contagious disease of pigs, is caused by classical swine fever virus (CSFV). In Taiwan, CSFVs from field outbreaks belong to two distinct genotypes. The historical genotype 3.4 dominated from the 1920s to 1996, and since 1996, the newly invading genotype 2.1 has dominated. To explain the phenomenon of this virus shift in the field, representative viruses belonging to genotypes 2.1 and 3.4 were either inoculated alone (single infection) or co-inoculated (co-infection), both in vivo and in vitro, to compare the virus replication and pathogenesis...
November 23, 2016: Virus Research
https://www.readbyqxmd.com/read/27889125/analysis-of-pasture-supplementation-strategies-by-means-of-a-mechanistic-model-of-ruminal-digestion-and-metabolism-in-the-dairy-cow
#10
J P McNamara, M J Auldist, L C Marett, P J Moate, W J Wales
Effective pasture supplementation is critical to the efficiency of resource management in milk production. We understand a great deal about ruminal and metabolic processes in dairy cattle that control efficiency but we need to improve our ability to predict effects of practical feeding strategies based on the basic biological processes of the cow. Therefore, a large-scale pasture supplementation study was used to explore the details of both practical management and the underlying biological principles and processes involved...
November 23, 2016: Journal of Dairy Science
https://www.readbyqxmd.com/read/27883029/helicity-within-the-vortex-filament-model
#11
R Hänninen, N Hietala, H Salman
Kinetic helicity is one of the invariants of the Euler equations that is associated with the topology of vortex lines within the fluid. In superfluids, the vorticity is concentrated along vortex filaments. In this setting, helicity would be expected to acquire its simplest form. However, the lack of a core structure for vortex filaments appears to result in a helicity that does not retain its key attribute as a quadratic invariant. By defining a spanwise vector to the vortex through the use of a Seifert framing, we are able to introduce twist and henceforth recover the key properties of helicity...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27856755/controlling-dna-nanoparticle-serum-interactions
#12
Kyryl Zagorovsky, Leo Y T Chou, Warren C W Chan
Understanding the interaction of molecularly assembled nanoparticles with physiological fluids is critical to their use for in vivo delivery of drugs and contrast agents. Here, we systematically investigated the factors and mechanisms that govern the degradation of DNA on the nanoparticle surface in serum. We discovered that a higher DNA density, shorter oligonucleotides, and thicker PEG layer increased protection of DNA against serum degradation. Oligonucleotides on the surface of nanoparticles were highly resistant to DNase I endonucleases, and degradation was carried out exclusively by protein-mediated exonuclease cleavage and full-strand desorption...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27847940/heterogeneity-of-crowded-cellular-fluids-on-the-meso-and-nanoscale
#13
Olivia Stiehl, Matthias Weiss
Cellular fluids are complex media that are crowded with macromolecules and membrane-enclosed organelles on several length scales. Many studies have shown that crowding can significantly alter transport and reaction kinetics in biological but also in bio-mimetic fluids. Yet, experimental insights on how well bio-mimetic fluids can capture the complexity of cellular fluids are virtually missing. Therefore, we have combined fluorescence correlation spectroscopy (FCS) and fluorescence lifetime imaging microscopy (FLIM) to compare the spatial heterogeneities of biological and simple bio-mimetic crowded fluids...
November 16, 2016: Soft Matter
https://www.readbyqxmd.com/read/27847690/release-of-moxifloxacin-from-contact-lenses-using-an-in-vitro-eye-model-impact-of-artificial-tear-fluid-composition-and-mechanical-rubbing
#14
Chau-Minh Phan, Magdalena Bajgrowicz-Cieslak, Lakshman N Subbaraman, Lyndon Jones
PURPOSE: The aim of this study was to evaluate and compare the release of moxifloxacin from a variety of daily disposable (DD) contact lenses (CLs) under various conditions using a novel in vitro eye model. METHODS: Four commercially available DD conventional hydrogel (CH) CLs (nelfilcon A, omafilcon A, etafilcon A, and ocufilcon B) and three silicone hydrogel (SH) CLs (somofilcon A, narafilcon A, and delefilcon A) were evaluated. These lenses were incubated in moxifloxacin for 24 hours...
November 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27843312/formulation-characterization-and-tissue-distribution-of-a-novel-ph-sensitive-long-circulating-liposome-based-theranostic-suitable-for-molecular-imaging-and-drug-delivery
#15
Yin Duan, Lihui Wei, Julia Petryk, Terrence D Ruddy
PURPOSE: When designing liposome formulas for treatment and diagnostic purposes, two of the most common challenges are 1) the lack of a specific release mechanism for the encapsulated contents and 2) a short circulation time due to poor resistance to biological fluids. This study aimed to create a liposome formula with prolonged in vivo longevity and pH-sensitivity for cytoplasmic drug delivery. MATERIALS AND METHODS: Liposomal particles were generated using hydrogenated soy (HS) phosphatidylcholine, cholesteryl hemisuccinate (CHEM), polyethylene glycol (PEG) and diethylenetriaminepentaacetic acid-modified phosphatidylethanolamine with film hydration and extrusion methods...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27832312/penetration-and-distribution-of-gadolinium-based-contrast-agents-into-the-cerebrospinal-fluid-in-healthy-rats-a-potential-pathway-of-entry-into-the-brain-tissue
#16
Gregor Jost, Thomas Frenzel, Jessica Lohrke, Diana Constanze Lenhard, Shinji Naganawa, Hubertus Pietsch
OBJECTIVE: Signal hyperintensity on unenhanced MRI in certain brain regions has been reported after multiple administrations of some, but not all, gadolinium-based contrast agents (GBCAs). One potential initial pathway of GBCA entry into the brain, infiltration from blood into the cerebrospinal fluid (CSF), was systematically evaluated in this preclinical study. METHODS: GBCA infiltration and distribution in the CSF were investigated in healthy rats using repeated fluid-attenuated MRI up to 4 h after high-dose (1...
November 10, 2016: European Radiology
https://www.readbyqxmd.com/read/27828286/scintillations-of-led-sources-in-oceanic-turbulence
#17
Yahya Baykal
The scintillation index of light emitting diode (LED) sources is evaluated when such sources are employed in oceanic wireless optical communication (UWOC) links. In the formulation, LED source radiation is taken to be perfectly incoherent with a Gaussian field distribution. We have utilized the scintillation index solution of an incoherent source in atmospheric turbulence, together with our recently obtained expression that expresses the structure constant of atmospheric turbulence in terms of the oceanic turbulence and UWOC link parameters...
November 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27825244/catalytic-conversion-in-nanoporous-materials-concentration-oscillations-and-spatial-correlations-due-to-inhibited-transport-and-intermolecular-interactions
#18
Andrés García, James W Evans
We show that steady-state catalytic conversion in nanoporous materials can occur in a quasi-counter-diffusion mode with the reactant (product) concentration strongly decaying (growing) into the pore, but also with oscillations in the total concentration. These oscillations reflect the response of the fluid to the transition from an extended to a confined environment near the pore opening. We focus on the regime of strongly inhibited transport in narrow pores corresponding to single-file diffusion. Here, limited penetration of the reactant into the pores and the associated low reaction yield is impacted by strong spatial correlations induced by both reaction (non-equilibrium correlations) and also by intermolecular interactions (thermodynamic correlations)...
November 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27821742/abiotic-methane-formation-during-experimental-serpentinization-of-olivine
#19
Thomas M McCollom
Fluids circulating through actively serpentinizing systems are often highly enriched in methane (CH4). In many cases, the CH4 in these fluids is thought to derive from abiotic reduction of inorganic carbon, but the conditions under which this process can occur in natural systems remain unclear. In recent years, several studies have reported abiotic formation of CH4 during experimental serpentinization of olivine at temperatures at or below 200 °C. However, these results seem to contradict studies conducted at higher temperatures (300 °C to 400 °C), where substantial kinetic barriers to CH4 synthesis have been observed...
November 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27821120/pro-inflammatory-cytokines-and-structural-biomarkers-are-effective-to-categorize-osteoarthritis-phenotype-and-progression-in-standardbred-racehorses-over-five-years-of-racing-career
#20
Andrea Bertuglia, Eleonora Pagliara, Elena Grego, Alessandro Ricci, Nika Brkljaca-Bottegaro
BACKGROUND: Joint impact injuries initiate a progressive articular damage finally leading to post-traumatic osteoarthritis (PTOA). Racehorses represent an ideal, naturally available, animal model of the disease. Standardbred racehorses developing traumatic osteoarthritis of the fetlock joint during the first year of their career were enrolled in our study. Age-matched controls were contemporarily included. Biomarker levels of equine osteoarthritis were measured in serum and synovial fluid (SF) at baseline, and repeated yearly over the next 4 years of training (from T1 to T4)...
November 8, 2016: BMC Veterinary Research
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