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https://www.readbyqxmd.com/read/29666691/internal-laryngocele-unusual-onset-in-a-91-year-old-female-patient
#1
Maria C Spinosi, Chiara Mezzedimi, Giovanni Monciatti, Desiderio Passali
While internal laryngoceles rarely cause major clinical complaints, they may lead to airway obstruction and require emergency intervention on rare occasions. We report a 91-year-old patient who was referred to the Ear, Nose & Throat Clinic of the Policlinico Santa Maria alle Scotte, Siena, Italy, in 2017 due to recurrent episodes of severe dyspnoea. A flexible nasopharyngolaryngoscopic examination revealed an internal laryngocele of approximately 1.5 cm in diameter that moved up and down the glottic plane, occasionally invading the subglottic space during inspiration and impeding airflow...
February 2018: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/29663004/synchronization-in-pairs-of-rotating-active-biomotors
#2
Neus Oliver, Christina Alpmann, Álvaro Barroso, Lena Dewenter, Mike Woerdemann, Cornelia Denz
Although synchronization is a well-known physical phenomenon, experimental studies of its emergence in living bacterial cells are still scarce. The difficulty in generating a controlled scenario to detect synchronization has limited the experimental outcomes so far. We present a realization based on holographic optical tweezers in which adhered pairs of self-propelled bacteria rotate in a plane. The separation distance between the bacteria determines the strength of the hydrodynamic coupling. Despite the noisy environment and autonomous dynamics of the living bacteria, we find evidence of phase locking and frequency entrainment in their rotation...
April 17, 2018: Soft Matter
https://www.readbyqxmd.com/read/29651496/plasmonic-sphere-on-plane-systems-with-semiconducting-polymer-spacer-layers
#3
Binxing Yu, Jill I Tracey, Zhongkai Cheng, Martin Vacha, Deirdre M O'Carroll
The optical properties of metal-film-coupled nanoparticles (NPs) are highly sensitive to physical and optical interactions between the NPs and the spacer medium in the gap between the NP and metal film. Here, we investigate the physical and optical interactions between gold NPs (AuNPs) and semiconducting conjugated polymer thin-film spacers in a "sphere-on-plane" type metal-film-coupled NP system, and their influence on the plasmonic scattering of individual AuNPs. We choose two different conjugated polymers: one with an absorption spectrum that is resonant with the plasmonic modes of the AuNPs and another that is non-resonant...
April 13, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29651116/angular-flux-creep-contributions-in-yba-2-cu-3-o-7-%C3%AE-nanocomposites-from-electrical-transport-measurements
#4
F Vallès, A Palau, V Rouco, B Mundet, X Obradors, T Puig
The shape of the electric-field-current-density (E-J) curve is determined by flux pinning and also by dynamics of vortices. Here, we propose a novel methodology to study the normalized flux creep rate S in YBa2 Cu3 O7-δ measured from E-J curves obtained by electrical transport measurements that provides a fast and versatile way to foresee the flux magnetic relaxation in films and disentangle angular flux creep contributions by the scaling of the isotropic contribution of S. After a detailed comparison of various pristine and nanocomposite films with differentiated nanostructures, we focus on the roles that intrinsic pinning and stacking faults (YBa2 Cu4 O8 -intergrowths) play when the magnetic field is applied parallel to the superconducting CuO2 planes...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29649559/ultrafast-doppler-for-neonatal-brain-imaging
#5
REVIEW
Charlie Demene, Jérôme Mairesse, Jérôme Baranger, Mickael Tanter, Olivier Baud
The emergence of functional neuroimaging has dramatically accelerated our understanding of the human mind. The advent of functional Magnetic Resonance Imaging paved the way for the next decades' major discoveries in neuroscience and today remains the "gold standard" for deep brain imaging. Recent improvements in imaging technology have been somewhat limited to incremental innovations of mature techniques instead of breakthroughs. Recently, the use of ultrasonic plane waves transmitted at ultrafast frame rates was shown to highly increase Doppler ultrasound sensitivity to blood flows in small vessels in rodents...
April 9, 2018: NeuroImage
https://www.readbyqxmd.com/read/29628547/ultrasound-guided-combined-fascial-plane-blocks-as-an-intervention-for-pain-management-after-laparoscopic-cholecystectomy-a-randomized-control-study
#6
Seshadri Ramkiran, Mathews Jacob, Manish Honwad, Desiraju Vivekanand, Mathangi Krishnakumar, Seema Patrikar
Background: Pain associated with laparoscopic cholecystectomy is most severe during the first 24 h and the port sites are the most painful. Recent multimodal approaches target incisional pain instead of visceral pain which has led to the emergence of abdominal fascial plane blocks. This study embraces a novel combination of two independently effective fascial plane blocks, namely rectus sheath block and subcostal transversus abdominis plane (TAP) block to alleviate postoperative pain...
January 2018: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29584424/controlling-the-recognition-and-reactivity-of-alkyl-ammonium-guests-using-an-anion-coordination-based-tetrahedral-cage
#7
Wenyao Zhang, Dong Yang, Jie Zhao, Lekai Hou, Jonathan L Sessler, Xiao-Juan Yang, Biao Wu
Caged structures have found wide application in a variety of areas, including guest encapsulation and catalysis. Although metal-based cages have dominated the field, anion-coordination-based cages are emerging as a new type of supramolecular ensemble with interesting host-guest properties. In the current work, we report a C3-symmetric tris-bis(urea) ligand based on the 2,4,6-triphenyl-1,3,5-triazine spacer, which assembles with phosphate anions to form an A4L4-type (A = anion, L = ligand) tetrahedral cage, 3, with unusually high packing coefficients (up to 99...
March 27, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29581514/structure-and-dynamics-of-polymeric-canopies-in-nanoscale-ionic-materials-an-electrical-double-layer-perspective
#8
Zhou Yu, Fengchang Yang, Sheng Dai, Rui Qiao
Nanoscale ionic materials (NIMs) are an emerging class of materials consisting of charged nanoparticles and polymeric canopies attaching to them dynamically by electrostatic interactions. Using molecular simulations, we examine the structure and dynamics of the polymeric canopies in model NIMs in which the canopy thickness is much smaller than the nanoparticle diameter. Without added electrolyte ions, the charged terminal groups of polymers adsorb strongly on charged walls, thereby electrostatically "grafting" polymers to the wall...
March 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29581183/how-cells-sense-their-own-shape-mechanisms-to-probe-cell-geometry-and-their-implications-in-cellular-organization-and-function
#9
REVIEW
Armin Haupt, Nicolas Minc
Cells come in a variety of shapes that most often underlie their functions. Regulation of cell morphogenesis implies that there are mechanisms for shape sensing that still remain poorly appreciated. Global and local cell geometry features, such as aspect ratio, size or membrane curvature, may be probed by intracellular modules, such as the cytoskeleton, reaction-diffusion systems or molecular complexes. In multicellular tissues, cell shape emerges as an important means to transduce tissue-inherent chemical and mechanical cues into intracellular organization...
March 26, 2018: Journal of Cell Science
https://www.readbyqxmd.com/read/29558623/giant-mechano-optoelectronic-effect-in-an-atomically-thin-semiconductor
#10
Wei Wu, Jin Wang, Peter Ercius, Nicomario Courtney Wright, Danielle Marie Leppert-Simenauer, Robert A Burke, Madan Dubey, Avinash M Dongare, Michael Thompson Pettes
Transition metal dichalcogenides (TMDs) are particularly sensitive to mechanical strain as they are capable of experiencing high atomic displacements without nucleating defects to release excess energy. Promising for photonic applications, it has been shown that as certain phases of layered TMDs MX2 (M=Mo, W; X=S, Se, Te) are scaled to a thickness of one monolayer, the photoluminescence response is dramatically enhanced due to the emergence of a direct electronic band gap, compared with their multi-layer or bulk counterparts which typically exhibit indirect band gaps...
March 20, 2018: Nano Letters
https://www.readbyqxmd.com/read/29555992/massive-dirac-fermions-in-a-ferromagnetic-kagome-metal
#11
Linda Ye, Mingu Kang, Junwei Liu, Felix von Cube, Christina R Wicker, Takehito Suzuki, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, David C Bell, Liang Fu, Riccardo Comin, Joseph G Checkelsky
The kagome lattice is a two-dimensional network of corner-sharing triangles that is known to host exotic quantum magnetic states. Theoretical work has predicted that kagome lattices may also host Dirac electronic states that could lead to topological and Chern insulating phases, but these states have so far not been detected in experiments. Here we study the d-electron kagome metal Fe3 Sn2 , which is designed to support bulk massive Dirac fermions in the presence of ferromagnetic order. We observe a temperature-independent intrinsic anomalous Hall conductivity that persists above room temperature, which is suggestive of prominent Berry curvature from the time-reversal-symmetry-breaking electronic bands of the kagome plane...
March 19, 2018: Nature
https://www.readbyqxmd.com/read/29541508/impact-of-errors-in-experimental-parameters-on-reconstructed-breast-images-using-diffuse-optical-tomography
#12
Bin Deng, Mats Lundqvist, Qianqian Fang, Stefan A Carp
Near-infrared diffuse optical tomography (NIR-DOT) is an emerging technology that offers hemoglobin based, functional imaging tumor biomarkers for breast cancer management. The most promising clinical translation opportunities are in the differential diagnosis of malignant vs. benign lesions, and in early response assessment and guidance for neoadjuvant chemotherapy. Accurate quantification of the tissue oxy- and deoxy-hemoglobin concentration across the field of view, as well as repeatability during longitudinal imaging in the context of therapy guidance, are essential for the successful translation of NIR-DOT to clinical practice...
March 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29536996/atomistic-investigations-on-the-mechanical-properties-and-fracture-mechanisms-of-indium-phosphide-nanowires
#13
Turash Haque Pial, Tawfiqur Rakib, Satyajit Mojumder, Mohammad Motalab, M A Salam Akanda
The mechanical properties of indium phosphide (InP) nanowires are an emerging issue due to the promising applications of these nanowires in nanoelectromechanical and microelectromechanical devices. In this study, molecular dynamics simulations of zincblende (ZB) and wurtzite (WZ) crystal structured InP nanowires (NWs) are presented under uniaxial tension at varying sizes and temperatures. It is observed that the tensile strengths of both types of NWs show inverse relationships with temperature, but are independent of the size of the nanowires...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29515514/progressive-abduction-loading-therapy-with-horizontal-plane-viscous-resistance-targeting-weakness-and-flexion-synergy-to-treat-upper-limb-function-in-chronic-hemiparetic-stroke-a-randomized-clinical-trial
#14
Michael D Ellis, Carolina Carmona, Justin Drogos, Julius P A Dewald
Background: Progressive abduction loading therapy has emerged as a promising exercise therapy in stroke rehabilitation to systematically target the loss of independent joint control (flexion synergy) in individuals with chronic moderate/severe upper-extremity impairment. Preclinical investigations have identified abduction loading during reaching exercise as a key therapeutic factor to improve reaching function. An augmentative approach may be to additionally target weakness by incorporating resistance training to increase constitutive joint torques of reaching with the goal of improving reaching function by "overpowering" flexion synergy...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29504764/uv-light-induced-vibrational-coherences-the-key-to-understand-kasha-rule-violation-in-trans-azobenzene
#15
Artur Nenov, Rocio Borrego-Varillas, Aurelio Oriana, Lucia Ganzer, Francesco Segatta, Irene Conti, Javier Segarra-Martí, Junko Omachi, Maurizio Dapor, Simone Taioli, Cristian Manzoni, Shaul Mukamel, Giulio Cerullo, Marco Garavelli
We combine sub-20-fs transient absorption spectroscopy with state-of-the-art computations to study the ultrafast photoinduced dynamics of trans-azobenzene (AB). We are able to resolve the lifetime of the ππ* state, whose decay within ca. 50 fs is correlated to the build-up of the nπ* population and to the emergence of coherences in the dynamics, to date unobserved. Nonlinear spectroscopy simulations call for the CNN in-plane bendings as the active modes in the sub-ps photoinduced coherent dynamics out of the ππ* state...
March 5, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29495599/a-custom-approach-for-a-flexible-real-time-and-reliable-software-defined-utility
#16
Agustín Zaballos, Joan Navarro, Ramon Martín De Pozuelo
Information and communication technologies (ICTs) have enabled the evolution of traditional electric power distribution networks towards a new paradigm referred to as the smart grid. However, the different elements that compose the ICT plane of a smart grid are usually conceived as isolated systems that typically result in rigid hardware architectures, which are hard to interoperate, manage and adapt to new situations. In the recent years, software-defined systems that take advantage of software and high-speed data network infrastructures have emerged as a promising alternative to classic ad hoc approaches in terms of integration, automation, real-time reconfiguration and resource reusability...
February 28, 2018: Sensors
https://www.readbyqxmd.com/read/29494139/air-stable-in-plane-anisotropic-gese2-for-highly-polarization-sensitive-photodetection-in-short-wave-region
#17
Yusi Yang, Shun-Chang Liu, Wei Yang, Zongbao Li, Yang Wang, Xia Wang, Shishu Zhang, Yun Zhang, Mingsheng Long, Gengmin Zhang, Ding-Jiang Xue, Jin-Song Hu, Li-Jun Wan
In-plane anisotropic layered materials such as black phosphorus (BP) have emerged as an important class of two-dimensional (2D) materials that bring a new dimension to the properties of 2D materials, hence providing a wide range of opportunities for developing conceptually new device applications. However, all of recently reported anisotropic 2D materials are relatively narrow-bandgap semiconductors (< 2 eV), and there has been no report about this type materials with wide bandgap, restricting the relevant applications such as polarization-sensitive photodetection in short wave region...
March 1, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29492394/pre-transplant-ventricular-assist-device-explant
#18
REVIEW
Espeed Khoshbin, Stephan Schueler
Explantation of a left ventricular assist device (LVAD) may be challenging even in the most experienced hands. We aim to describe the technique for explantation of an LVAD together with the heart as applicable to all contemporary implantable mechanical assist devices. In order to ensure safe explantation, particular care must be taken at three distinct stages: at the time of LVAD implantation, at pre-transplant assessment and at the time of heart transplantation. The preparation for a safe explantation at LVAD implantation includes positioning the driveline and the outflow graft away from the back of the sternum to ensure protection from injury during re-entry into the chest...
January 2018: Annals of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29491482/a-new-pleistocene-hominin-tracksite-from-the-cape-south-coast-south-africa
#19
Charles W Helm, Richard T McCrea, Hayley C Cawthra, Martin G Lockley, Richard M Cowling, Curtis W Marean, Guy H H Thesen, Tammy S Pigeon, Sinèad Hattingh
A Late Pleistocene hominin tracksite has been identified in coastal aeolianite rocks on the Cape south coast of South Africa, an area of great significance for the emergence of modern humans. The tracks are in the form of natural casts and occur on the ceiling and side walls of a ten-metre long cave. Preservation of tracks is of variable quality. Up to forty hominin tracks are evident. Up to thirty-five hominin tracks occur on a single bedding plane, with potential for the exposure of further tracks. Five tracks are apparent on a second hominin track-bearing bedding plane...
February 28, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29487359/fabrication-and-characterization-of-a-magnetic-drilling-actuator-for-navigation-in-a-three-dimensional-phantom-vascular-network
#20
Sunkey Lee, Seungmin Lee, Sangwon Kim, Chang-Hwan Yoon, Hun-Jun Park, Jin-Young Kim, Hongsoo Choi
Intravascular microrobots have emerged as a promising tool for vascular diseases. They can be wirelessly and precisely manipulated with a high degree of freedom. Previous studies have evaluated their drilling performance and locomotion, and showed the feasibility of using microrobots for biomedical applications in two-dimensional space. However, it is critical to validate micro-drillers in a three-dimensional (3D) environment because gravity plays an important role in a 3D environment and significantly affects the performance of the micro-drillers in vascular networks...
February 27, 2018: Scientific Reports
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