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Sheila N Myatra, Rupali S Kalkundre, Jigeeshu V Divatia
PURPOSE OF REVIEW: The last 2 decades have seen a vast change in the science and technology of airway management. As a result, there is an increasing need to equip anesthesiologists with the new knowledge and skills for the safe management of a difficult airway. RECENT FINDINGS: In addition to knowledge and expertise, human factors and nontechnical skills (NTS), including situational awareness, communication and team work, play an important role during difficult airway management and contribute to the outcome...
September 21, 2017: Current Opinion in Anaesthesiology
Sezin Erarpat, Gözde Özzeybek, Dotse Selali Chormey, Sezgin Bakırdere
In this study, dispersive liquid-liquid microextraction (DLLME) and slotted quartz tube (SQT) were coupled to flame atomic absorption spectrometry (FAAS) to increase the sensitivity of lead. Conditions such as the formation of the lead-dithizone complex, efficiency of the DLLME method and the output of the SQT were systematically optimized to improve the detection limit for the analyte. The conventional FAAS system was improved upon by about 3.0 times with SQT-FAAS, 32 times with DLLME-FAAS and 142 times with DLLME-SQT-FAAS...
September 17, 2017: Chemosphere
L Mehrvar, M Sadeghipari, S H Tavassoli, S Mohajerzadeh, M Fathipour
Surface enhanced Raman scattering (SERS) systems with large number of active sites exhibit superior capability in detection of low concentration analytes. In this paper, we present theoretical as well as experimental studies on the optical properties of a unique hybrid nanostructure, Ag NPs decorated silicon double nanocones (Si-DNCs) array, which provide high density of hot spots. The Si-DNC array is fabricated by employing electron beam lithography together with plasma etching process. Multipole analysis of the scattering spectra, based on the multipole expansion theory, confirms that the toroidal dipole moment dominates over other electric and magnetic multipole moments in the Si-DNCs array...
September 21, 2017: Scientific Reports
Maor Mutzafi, Ido Kaminer, Gal Harari, Mordechai Segev
The wave-like nature of electrons has been known for almost a century, but only in recent years has the ability to shape the wavefunction of EBeams (Electron-Beams) become experimentally accessible. Various EBeam wavefunctions have been demonstrated, such as vortex, self-accelerating, Bessel EBeams etc. However, none has attempted to manipulate multi-electron beams, because the repulsion between electrons rapidly alters the beam shape. Here, we show how interference effects of the quantum wavefunction describing multiple electrons can be used to exactly balance both the repulsion and diffraction-broadening...
September 21, 2017: Nature Communications
Sooraj Nizamani, Tasneem G Kazi, Hassan I Afridi, Sehrish Talpur, Ayaz Lashari, Anjum Lashari, Jamshed Ali
A simple vortex-assisted modified dispersive liquid–liquid microextraction procedure is proposed forthe enrichment of cadmium (Cd(+2)) in surface (stored rainwater) and groundwater of the Tharparkar district in Pakistan, before analysis by flame atomic absorption spectrometry. Ammonium pyrrolidinedithiocarbamate was used as a ligand to make a hydrophobic complex of Cd(+2), which was extracted in an ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate), and the nonionic surfactant Triton X-114 was applied as a dispersing medium...
September 21, 2017: Journal of AOAC International
Cong Tian, Leona H Gagnon, Chantal Longo-Guess, Ron Korstanje, Susan M Sheehan, Kevin K Ohlemiller, Angela D Schrader, Jaclynn M Lett, Kenneth R Johnson
Mutations of the human ATP6V1B1 gene cause distal renal tubular acidosis (dRTA; OMIM #267300) often associated with sensorineural hearing impairment; however, mice with a knockout mutation of Atp6v1b1 were reported to exhibit a compensated acidosis and normal hearing. We discovered a new spontaneous mutation (vortex, symbol vtx) of Atp6v1b1 in an MRL/MpJ (MRL) colony of mice. In contrast to the reported phenotype of the knockout mouse, which was developed on a primarily C57BL/6 (B6) strain background, MRL-Atp6v1b1vtx/vtx mutant mice exhibit profound hearing impairment, which is associated with enlarged endolymphatic compartments of the inner ear...
October 1, 2017: Human Molecular Genetics
Hasnain Mehdi Jafri, Xingqiao Ma, Congpeng Zhao, Deshan Liang, Houbing Huang, Zhuhong Liu, Long-Qing Chen
Time dependent Ginzburg-Landau equations were solved by finite difference scheme for a superconducting sample in steady and oscillating magnetic fields for three-dimensional geometry. Dynamic behaviour of penetrating and leaving magnetic vortices in superconductor with the oscillating magnetic field was simulated. Carrier concentration density and the average magnetization of the sample were studied as a function of external oscillating magnetic field. Anomalies in carrier concentration at certain magnetic field values were observed and discussed...
September 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Xin Shen, Susanne Schnell, Alex J Barker, Kenichiro Suwa, Lingzi Tashakkor, Kelly Jarvis, James C Carr, Jeremy D Collins, Shyam Prabhakaran, Michael Markl
BACKGROUND: Complex and reverse flow in the aorta has been implicated in aneurysm development and stroke via retrograde embolization. PURPOSE: To evaluate global and regional differences between standard 2D plane-based and volumetric voxel-based quantification of regional forward/reverse flow, and reverse flow fraction (RFF) in the aorta. STUDY TYPE: Retrospective. SUBJECTS: In all, 35 subjects: 10 healthy controls (age: 57 ± 7 years, nine male), nine patients without aortic valve regurgitation (AR) (age: 63 ± 10 years, seven male), six patients with mild AR (age: 66 ± 6 years, five male), and 10 with moderate or severe AR (age: 60 ± 16 years, eight male)...
September 18, 2017: Journal of Magnetic Resonance Imaging: JMRI
Somying Somsubsin, Ketsarin Seebunrueng, Suthasinee Boonchiangma, Supalax Srijaranai
This paper describes the development of a simple solvent based microextraction, namely vortex assisted low density solvent-microextraction (VALDS-ME), followed by high performance liquid chromatography-fluorescence detection (HPLC-FD) for the simultaneous determination of four aflatoxins (AFs) including AFB1, AFB2, AFG1 and AFG2 in rice samples. In VALDS-ME, a mixture of low density solvents (1-octanol and toluene) was used as the extraction solvent. The extraction was rapidly achieved with the assistance of vortex agitation and phase separation was easily obtained after the addition of Na2SO4...
January 1, 2018: Talanta
P Guillamat, J Ignés-Mullol, F Sagués
Active matter embraces systems that self-organize at different length and time scales, often exhibiting turbulent flows apparently deprived of spatiotemporal coherence. Here, we use a layer of a tubulin-based active gel to demonstrate that the geometry of active flows is determined by a single length scale, which we reveal in the exponential distribution of vortex sizes of active turbulence. Our experiments demonstrate that the same length scale reemerges as a cutoff for a scale-free power law distribution of swirling laminar flows when the material evolves in contact with a lattice of circular domains...
September 15, 2017: Nature Communications
Wiktor Walasik, Salih Z Silahli, Natalia M Litchinitser
Recently, we have predicted that the modulation instability of optical vortex solitons propagating in nonlinear colloidal suspensions with exponential saturable nonlinearity leads to formation of necklace beams (NBs). Here, we investigate the dynamics of NB formation and propagation, and demonstrate a variety of optical beam structures emerging upon vortex beam propagation in engineered nonlinear colloidal medium. In particular, we show that the distance at which the NB is formed depends on the input power of the vortex beam...
September 15, 2017: Scientific Reports
S Amat, D Baines, T W Alexander
The objectives of this study were to develop a new assay for the evaluation of the antimicrobial activities of essential oils (EOs) in vapor-phase and to demonstrate the antimicrobial activities of commercial EOs against BRPs. To achieve the first objective, a microtube cap containing 100 μl of EO was embedded in an agar plate. An agar plug (diameter 13 mm) inoculated with a bacterial suspension containing10(8) CFU ml(-1) was then placed over the cap and incubated at 37 °C for 24 h. Subsequently, bacteria were recovered from the agar plug by immersion in 5 ml of broth for 10 min, followed by vortexing for 30 s, and the broths were then plated for enumeration...
September 15, 2017: Letters in Applied Microbiology
A Aadhi, Varun Sharma, R P Singh, G K Samanta
We report on a high-power, continuous-wave source of optical vortices tunable in the mid-infrared (mid-IR) wavelength range. Using the orbital angular momentum (OAM) conservation of the parametric processes and the threshold conditions of the cavity modes of the singly resonant optical parametric oscillator (SRO), we have transferred the OAM of the pump beam at the near-infrared wavelength to the idler beam tunable in the mid-IR. Pumped with a vortex beam of order lp=1 at 1064 nm, the SRO, configured in a four curved mirror-based ring cavity with a 50 mm long MgO-doped periodically poled LiNbO3 crystal, produces an idler beam with an output power in excess of 2 W in a vortex spatial profile with the order li=1, tunable across 2217-3574 nm and corresponding signal beam in Gaussian intensity distribution across 1515-2046 nm...
September 15, 2017: Optics Letters
E Berganza, M Jaafar, C Bran, J A Fernández-Roldán, O Chubykalo-Fesenko, M Vázquez, A Asenjo
Cylindrical nanowires synthesized by controlled electrodeposition constitute excellent strategic candidates to engineer magnetic domain configurations. In this work, multisegmented CoNi/Ni nanowires are synthesized for tailoring a periodic magnetic structure determined by the balance between magnetocrystalline and magnetostatic energies. High-resolution Transmission Electron Microscopy confirms the segmented growth and the sharp transition between layers. Although both CoNi and Ni segments have similar fcc cubic crystal symmetry, their magnetic configuration is quite different as experimentally revealed by Magnetic Force Microscopy (MFM) imaging...
September 14, 2017: Scientific Reports
Vassilios Papapostolou, Daniel H Wacks, Nilanjan Chakraborty, Markus Klein, Hong G Im
Enstrophy is an intrinsic feature of turbulent flows, and its transport properties are essential for the understanding of premixed flame-turbulence interaction. The interrelation between the enstrophy transport and flow topologies, which can be assigned to eight categories based on the three invariants of the velocity-gradient tensor, has been analysed here. The enstrophy transport conditional on flow topologies in turbulent premixed flames has been analysed using a Direct Numerical Simulation database representing the corrugated flamelets (CF), thin reaction zones (TRZ) and broken reaction zones (BRZ) combustion regimes...
September 14, 2017: Scientific Reports
Razwan Baber, Luca Mazzei, Nguyen Thi Kim Thanh, Asterios Gavriilidis
In this work we present a detailed study of flow technology approaches that could open up new possibilities for nanoparticle synthesis. The synthesis of gold and silver nanoparticles (NPs) in a flow device based on a coaxial flow reactor (CFR) was investigated. The CFR comprised of an outer glass tube of 2 mm inner diameter (I.D.) and an inner glass tube whose I.D. varied between 0.142 and 0.798 mm. A split and recombine (SAR) mixer and coiled flow inverter (CFI) were further employed to alter the mixing conditions after the CFR...
September 14, 2017: Nanoscale
Marco Demori, Marco Ferrari, Arianna Bonzanini, Pietro Poesio, Vittorio Ferrari
In this paper an energy harvesting system based on a piezoelectric converter to extract energy from airflow and use it to power battery-less sensors is presented. The converter is embedded as a part of a flexure beam that is put into vibrations by von Karman vortices detached from a bluff body placed upstream. The vortex street has been investigated by Computational Fluid Dynamics (CFD) simulations, aiming at assessing the vortex shedding frequency as a function of the flow velocity. From the simulation results the preferred positioning of the beam behind the bluff body has been derived...
September 13, 2017: Sensors
Zhongyan Wang, Chunhui Liang, Fang Shi, Tao He, Changyang Gong, Ling Wang, Zhimou Yang
Inflammatory responses play crucial roles in the development and progression of tumors. Tumor-associated inflammation not only promotes tumor growth but also induces the suppression of immune responses against tumors. We demonstrate in this study that hydrogels of nonsteroidal anti-inflammatory drug (NSAID) modified D-tetrapeptides (G(D)F(D)F(D)Y) are promising cancer vaccine adjuvants, especially for Fbp-gel and Car-gel. The hydrogels allow easy incorporation of a protein OVA antigen by vortexing. Our results indicate that vaccines based on Fbp-gel and Car-gel increase IgG production by 1476- and 929-fold, compared with the OVA group, respectively...
September 12, 2017: Nanoscale
Hongwei Bao, Yuhong Huang, Zhi Yang, Yaping Miao, Yunjin Sun, Yu Bai, Kewei Xu, Fei Ma
Molecular dynamics (MD) simulations are conducted to study the deformation behavior and strain distribution in two-dimensional (2D) nano-rings of graphene, single-layer black phosphorus (SLBP) and single-layer MoS2 (SLMoS2) under circular torsion. Interestingly, fan-blade shaped wrinkling is generated, in which the maximum torsion angle (Δθ) and the potential energy change per atom (ΔPe) increase with increasing inner radius but decrease with increasing temperature. As the inner radius is increased, the wave number of wrinkling increases but the wave amplitude decreases...
September 12, 2017: Physical Chemistry Chemical Physics: PCCP
Mohammad Asadi
A rapid, simple, and green vortex-assisted emulsification microextraction method based on solidification of floating organic drop was developed for the extraction and determination of ochratoxin A (OTA) with high-performance liquid chromatography. Some factors influencing the extraction efficiency of OTA such as the type and volume of extraction solvent, sample pH, salt concentration, vortex time, and sample volume were optimized. Under optimized conditions, the calibration curve exhibited linearity in the range of 50...
September 10, 2017: Mycotoxin Research
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