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https://www.readbyqxmd.com/read/29785608/reuse-of-organobentonites-with-a-carbon-dioxide-responsive-solvent
#1
Ling-Yu Luan, Li Zhang, Li-Hong Wang
Synthesized organobentonite (SOB), montmorillonite (MMT), and commercial organobentonite (COB) were used as adsorbents for paraffin oil, a model pollutant in land-based oil spills and oil pipeline rupture. The characterization of clays was carried out with scanning electron microscopy (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). After adsorption, oil was separated from adsorbents with a carbon dioxide responsive solvent N,N-dimethylcyclohexylamine (DMCHA), and DMCHA was subsequently separated from paraffin oil upon CO2 bubbling instead of distillation with high energy cost...
May 22, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785361/air-bubbles-in-the-urinary-tract-incidental-and-asymptomatic-combined-emphysematous-pyelitis-ureteritis-and-cystitis-a-rare-case-report-and-review-of-the-literature
#2
Ahmad Alenezi, Mohammed A K Al-Ruwaished, Ahmed Almujalhem
No abstract text is available yet for this article.
May 2018: Urology Case Reports
https://www.readbyqxmd.com/read/29784547/bubble-contrast-echocardiography-for-alcohol-septal-ablation
#3
Eduardo A Arias, Marco Antonio Peña-Duque, Marco Antonio Martínez-Ríos
No abstract text is available yet for this article.
May 18, 2018: Revista Española de Cardiología
https://www.readbyqxmd.com/read/29782336/a-review-of-small-incision-lenticule-extraction-complications
#4
Ronald R Krueger, Caio S Meister
PURPOSE OF REVIEW: As a flapless procedure, SMILE brings benefits to refractive surgery, such as lower corneal biomechanical impact, less dry eye risk and less stromal bed exposure. However, the longer learning curve can be a risk factor for complications. This article aims to discuss SMILE complications and proposes a categorized analysis of occurrences, dividing into two groups: intraoperative and postoperative complications. Among intraoperative, we also suggest a subdivision between those related to the laser (lenticule construction), tissue separation (lenticule dissection) and tissue removal (lenticule extraction)...
May 17, 2018: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29781622/flow-regimes-and-transition-criteria-during-passage-of-bubbles-through-a-liquid-liquid-interface
#5
Travis S Emery, Pruthvik A Raghupathi, Satish G Kandlikar
The passage of a single bubble or a stream of bubbles through a liquid-liquid interface is a highly dynamic process that can result in a number of different outcomes. Previous studies focused primarily on a single bubble and single flow regime, and very few investigations have considered bubble streams. In the present work, six different liquid combinations made up of water, ethanol, a perfluorocarbon liquid, PP1, and one of three different viscosity silicone oils are tested with air bubbles from 2-6 mm in diameter rising between 5-55 cm/s...
May 21, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29780961/myopic-shift-in-a-pseudophakic-eye-with-an-accommodating-iol-following-vitrectomy-with-gas-tamponade
#6
Jonathan Aker, Jessica Dowling, Lawrence Halperin
Purpose: To report the case of a patient with Crystalens, an accommodating posterior-chamber intraocular lens (IOL), who experienced a myopic shift following subsequent vitrectomy with gas tamponade. We propose a hypothesis as to why this myopic shift occurred and analyze its validity based on current literature. Observations: A patient had cataract surgery with implantation of a Crystalens AT-50AO +21D. Preoperative A-scan measured anterior chamber depth (ACD) to be 3...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29777972/adsorption-kinetics-of-heptadecafluoro-1-nonanol-phase-transition-and-mixed-control
#7
Alvin Casandra, Boris A Noskov, Min-Yu Hu, Shi-Yow Lin
HYPOTHESIS: The adsorption kinetics of heptadecafluoro-1-nonanol (C9 H2 F17 OH) onto a clean air-water interface at low surfactant concentrations (equilibrium surface tension, γ(C) > 65 mN/m) has been reported, and the controlling mechanism was found to be mixed diffusive-kinetic controlled (Kuo et al., JCIS 402 (2013) 131). However, it remains to be determined what the adsorption kinetics are at higher concentrations. Hence, the dynamic surface tension, γ(t) of C9 H2 F17 OH was measured and compared with the theoretical γ(t) curves predicted from phase transition model...
May 12, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29776103/liquid-phase-stabilization-versus-bubble-formation-at-a-nanoscale-curved-interface
#8
Jarrod Schiffbauer, Tengfei Luo
We investigate the nature of vapor bubble formation near a nanoscale-curved convex liquid-solid interface using two models: an equilibrium Gibbs model for homogenous nucleation, and a nonequilibrium dynamic van der Waals-diffuse-interface model for phase change in an initially cool liquid. Vapor bubble formation is shown to occur for sufficiently large radius of curvature and is suppressed for smaller radii. Solid-fluid interactions are accounted for and it is shown that liquid-vapor interfacial energy, and hence Laplace pressure, has limited influence over bubble formation...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776047/dynamic-evolution-of-rayleigh-taylor-bubbles-from-sinusoidal-w-shaped-and-random-perturbations
#9
Zhi-Rui Zhou, You-Sheng Zhang, Bao-Lin Tian
Implicit large eddy simulations of two-dimensional Rayleigh-Taylor instability at different density ratios (i.e., Atwood number A=0.05, 0.5, and 0.9) are conducted to investigate the late-time dynamics of bubbles. To produce a flow field full of bounded, semibounded, and chaotic bubbles, three problems with distinct perturbations are simulated: (I) periodic sinusoidal perturbation, (II) isolated W-shaped perturbation, and (III) random short-wave perturbations. The evolution of height h, velocity v, and diameter D of the (dominant) bubble with time t are formulated and analyzed...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776028/modeling-thermal-inkjet-and-cell-printing-process-using-modified-pseudopotential-and-thermal-lattice-boltzmann-methods
#10
Salman Sohrabi, Yaling Liu
Pseudopotential lattice Boltzmann methods (LBMs) can simulate a phase transition in high-density ratio multiphase flow systems. If coupled with thermal LBMs through equation of state, they can be used to study instantaneous phase transition phenomena with a high-temperature gradient where only one set of formulations in an LBM system can handle liquid, vapor, phase transition, and heat transport. However, at lower temperatures an unrealistic spurious current at the interface introduces instability and limits its application in real flow system...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775365/raman-spectral-band-oscillations-in-large-graphene-bubbles
#11
Yuan Huang, Xiao Wang, Xu Zhang, Xianjue Chen, Baowen Li, Bin Wang, Ming Huang, Chongyang Zhu, Xuewei Zhang, Wolfgang S Bacsa, Feng Ding, Rodney S Ruoff
Raman spectra of large graphene bubbles showed size-dependent oscillations in spectral intensity and frequency, which originate from optical standing waves formed in the vicinity of the graphene surface. At a high laser power, local heating can lead to oscillations in the Raman frequency and also create a temperature gradient in the bubble. Based on Raman data, the temperature distribution within the graphene bubble was calculated, and it is shown that the heating effect of the laser is reduced when moving from the center of a bubble to its edge...
May 4, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29772184/tuning-interfacial-properties-and-processes-by-controlling-the-rheology-and-structure-of-pnipam-particles-at-air-water-interfaces
#12
Armando Maestro, Daniel William Jones, Carmen S de Rojas Sanchez, Eduardo Guzmán, Michael H G Duits, Pietro Cicuta
In this work, by combining controlled experiments on single interfaces with measurements on solitary bubbles and liquid foams, we show that Poly N-Isopropyl Acrylamide (PNIPAM) microgels assembled at air/water interfaces exhibit a solid to liquid transition changing the temperature, and that this is associated with the change in the interfacial microstructure of the PNIPAM particles around their volume phase transition temperature VPTT. We show that the solid behaves as a soft 2D colloidal glass, and that the existence of this solid/liquid transition offers an ideal platform for tuning the permeability of air bubbles covered by PNIPAM and to control macroscopic foam properties such as drainage, stability and foamability...
May 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29771376/rna-dna-and-dna-dna-base-pairing-at-the-upstream-edge-of-the-transcription-bubble-regulate-translocation-of-rna-polymerase-and-transcription-rate
#13
Maria KIreeva, Cyndi Trang, Gayane Matevosyan, Joshua Turek-Herman, Vitaly Chasov, Lucyna Lubkowska, Mikhail Kashlev
Translocation of RNA polymerase (RNAP) along DNA may be rate-limiting for transcription elongation. The Brownian ratchet model posits that RNAP rapidly translocates back and forth until the post-translocated state is stabilized by NTP binding. An alternative model suggests that RNAP translocation is slow and poorly reversible. To distinguish between these two models, we take advantage of an observation that pyrophosphorolysis rates directly correlate with the abundance of the pre-translocated fraction. Pyrophosphorolysis by RNAP stabilized in the pre-translocated state by bacteriophage HK022 protein Nun was used as a reference point to determine the pre-translocated fraction in the absence of Nun...
May 16, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#14
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29771036/-3d-computed-tomographic-study-of-concha-bullosa-drainage-pathway
#15
W H Zhang, Y L Zhao, X D Li
Objective: The aim of this study is to study the related structures with concha bullosa drainage passway in inpatients with concha bullosa disease. Method: A total of 90 patients with peritubular middle turbinate (144 sides) were examined by 16-slice spiral CT. The distribution of the middle turbinate and the distribution of the drainage channel were analyzed by three-dimensional reconstruction technique and image workstation software. Result: The distribution of the morphology and drainage channel of 144 concha bullosa have statistically significant ( P <0...
May 20, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29768512/infant-cpap-for-low-income-countries-an-experimental-comparison-of-standard-bubble-cpap-and-the-pumani-system
#16
Markus Falk, Snorri Donaldsson, Thomas Drevhammar
INTRODUCTION: Access to inexpensive respiratory support to newborn infants improves survival in low-income countries. Standard bubble continuous positive airway pressure (CPAP) has been extensively used worldwide for more than 30 years. One project aimed at providing affordable CPAP is the Pumani system developed by Rice 360°. Compared to standard bubble CPAP the system has an unconventional design. The aim was to compare the Pumani system with two traditional bubble CPAP systems, focusing on in-vitro performance and safety...
2018: PloS One
https://www.readbyqxmd.com/read/29764542/-unfractionated-heparin-ameliorates-lipopolysaccharide-induced-expressions-of-nitric-oxide-and-reactive-oxygen-species-in-renal-microvascular-endothelial-cells
#17
Xin Li, Yingjian Liang, Xiaojuan Zhang, Xiaochun Ma
OBJECTIVE: To observe the effect of heparin on the cellular morphology and the expressions of nitric oxide (NO) and reactive oxygen species (ROS) in renal microvascular endothelial cells (RMVECs) stimulated by lipopolysaccharide (LPS). METHODS: The three step gradient screen method was used to primarily culture rat RMVECs, and the 3rd and 4th generation cells with excellent growth were collected. The cells were divided into blank control group, 10 mg/L LPS treatment group and 2...
May 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29763801/bubble-coalescence-suppression-driven-carbon-monoxide-co-water-mass-transfer-increase-by-electrolyte-addition-in-a-hollow-fiber-membrane-bioreactor-hfmbr-for-microbial-co-conversion-to-ethanol
#18
Nulee Jang, Muhammad Yasin, Hyunsoo Kang, Yeubin Lee, Gwon Woo Park, Shinyoung Park, In Seop Chang
This study investigated the effects of electrolytes (CaCl2 , K2 HPO4 , MgSO4 , NaCl, and NH4 Cl) on CO mass transfer and ethanol production in a HFMBR. The hollow fiber membranes (HFM) were found to generate tiny gas bubbles; the bubble coalescence was significantly suppressed in electrolyte solution. The volumetric gas-liquid mass transfer coefficients (kL a) increased up to 414% compared to the control. Saturated CO (C∗ ) decreased as electrolyte concentrations increased. Overall, the maximum mass transfer rate (Rmax ) in electrolyte solution ranged from 106% to 339% of the value obtained in water...
May 4, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29761964/-real-time-investigation-of-dynamic-morphology-of-live-platelets-and-generation-of-platelet-microparticles-using-hopping-probe-ion-conductance-microscopy
#19
Xiao Liu, Yufu Luo, Yanjun Zhang
Platelets are rapidly activated by activators and produce a large number of platelet microparticles (PMPs) with high coagulation activity, resulting in coagulation dysfunction. However, the generation mechanism of PMPs is still not clear. Hopping probe ion conductance microscopy (HPICM) has special technical advantages in non-contact, real-time, high-resolution imaging of living cells under physiological conditions. Using HPICM, this study monitored the processes of platelet activation and generation of PMPs in real time in the presence of calcium ionophore A23187 and cytochalasin D (CD), respectively...
August 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29758745/bursting-endemic-bubbles-in-an-adaptive-network
#20
N Sherborne, K B Blyuss, I Z Kiss
The spread of an infectious disease is known to change people's behavior, which in turn affects the spread of disease. Adaptive network models that account for both epidemic and behavioral change have found oscillations, but in an extremely narrow region of the parameter space, which contrasts with intuition and available data. In this paper we propose a simple susceptible-infected-susceptible epidemic model on an adaptive network with time-delayed rewiring, and show that oscillatory solutions are now present in a wide region of the parameter space...
April 2018: Physical Review. E
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