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https://www.readbyqxmd.com/read/29166048/symmetry-breaking-and-spectral-considerations-of-the-surprisingly-floppy-c-c3h-radical-and-the-related-dipole-bound-excited-state-of-c-c3h
#1
Matthew K Bassett, Ryan C Fortenberry
The C3H radical is believed to be prevalent throughout the interstellar medium and may be involved in the formation of polycyclic aromatic hydrocarbons. C3H exists as both a linear and a cyclic isomer. The C2v cyclopropenylidenyl radical isomer was detected in the dark molecular cloud TMC-1, and the linear propenylidenyl radical isomer has been observed in various dark molecular clouds. Even though the c-C3H radical has been classified rotationally, the vibrational frequencies of this seemingly important interstellar molecule have never been directly observed...
June 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29135004/floppy-molecules-as-candidates-for-achieving-optoelectronic-molecular-devices-without-skeletal-rearrangement-or-bond-breaking
#2
Ioan Bâldea
Molecular species investigated as possible candidates for molecular photoswitches often toggle between two (low and high conductance) conformations implying skeletal rearrangement, bond breaking, and substantial changes of molecular length. All these represent shortcomings that impede the switching speed and straightforward incorporation in nanodevices. In the present paper we propose a mechanism wherein the photoinduced switching is from a nonplanar conformation to a planar conformation, and involves neither skeletal rearrangement nor bond breaking or significant molecular length changes...
November 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29058918/spatial-factors-for-triplet-fusion-reaction-of-singlet-oxygen-photosensitization
#3
Shuming Bai, Mario Barbatti
First-principles quantum-chemical description of photosensitized singlet oxygen generation kinetics is challenging because of the intrinsic complexity of the underlying triplet fusion process in a floppy molecular complex with open-shell character. With a quantum-chemical kinetic model specifically tailored to deal with this problem, the reaction rates are investigated as a function of intermolecular incidence direction, orientation, and distance between O2 and the photosensitizer. The adopted photosensitizer, 6-azo-2-thiothymine, combines practical interest and prototypical variability...
October 25, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29045137/efficient-geometry-minimization-and-transition-structure-optimization-using-interpolated-potential-energy-surfaces-and-iteratively-updated-hessians
#4
Jingjing Zheng, Michael J Frisch
An efficient geometry optimization algorithm based on interpolated potential energy surfaces with iteratively updated Hessians is presented in this work. At each step of geometry optimization (including both minimization and transition structure search), an interpolated potential energy surface is properly constructed by using the previously calculated information (energies, gradients, and Hessians/updated Hessians), and Hessians of the two latest geometries are updated in an iterative manner. The optimized minimum or transition structure on the interpolated surface is used for the starting geometry of the next geometry optimization step...
October 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29038802/viscous-forces-and-bulk-viscoelasticity-near-jamming
#5
Karsten Baumgarten, Brian P Tighe
When weakly jammed packings of soft, viscous, non-Brownian spheres are probed mechanically, they respond with a complex admixture of elastic and viscous effects. While many of these effects are understood for specific, approximate models of the particles' interactions, there are a number of proposed force laws in the literature, especially for viscous interactions. We numerically measure the complex shear modulus G* of jammed packings for various viscous force laws that damp relative velocities between pairs of contacting particles or between a particle and the continuous fluid phase...
November 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/28956098/how-to-size-asds-for-percutaneous-closure
#6
Isabelle Boon, Katrien Vertongen, Bernard P Paelinck, Laurent Demulier, An Van Berendoncks, Catherine De Maeyer, Fabienne Marchau, Joseph Panzer, Kristof Vandekerckhove, Daniel De Wolf
Percutaneous closure is the treatment of choice for secundum-type atrial septal defects (ASD). Balloon sizing (BS) has been the method of choice for deciding on device size. Improved 2D- and 3D-transesophageal echocardiographic (TEE) imaging challenged the necessity of BS. Balloon sizing was performed with two additional techniques to measure the stretched dimension of the ASD. The 1st method uses a stiff guide wire which stretches the ASD and 2D TEE. The second technique uses 3D TEE. Two hundred and thirty-six patients with minimum 1-year follow-up were enrolled...
September 27, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28942764/ocular-manifestations-of-obstructive-sleep-apnea
#7
Matthew Santos, R Jeffrey Hofmann
STUDY OBJECTIVES: Obstructive sleep apnea (OSA) incurs a host of systemic side effects. The eyes are particularly susceptible to both mechanical and vascular sequelae of the disease. This paper outlines the ocular manifestations of sleep apnea. The authors hope to increase awareness of the ocular complications of this common disorder and increase communication and co-management between eye-care providers and sleep specialists alike. METHODS: Data were collected from PubMed and the Brown University Library Collection...
November 15, 2017: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/28937828/the-effects-of-systemic-alfuzosin-and-tamsulosin-hydrochloride-on-choroidal-thickness-and-pupil-diameter-sizes-in-cases-with-benign-prostatic-hyperplasia
#8
Mustafa Dogan, Bunyamin Kutluksaman, Ibrahim Keles, Mustafa Karalar, Ahmet Omer Halat
PURPOSE: To compare the effects of alfuzosin hydrochloride and tamsulosin hydrochloride on choroidal thickness (CT) and pupil diameter (PD) sizes in patients with benign prostatic hyperplasia. SUBJECTS AND METHODS: Sixty-three men patients with newly diagnosis of benign prostatic hyperplasia were randomly assigned to either alfuzosin hydrochloride or to tamsulosin hydrochloride groups in this prospective, randomized, parallel-group clinical trial. Enhanced depth imaging spectral-domain optical coherence tomography, pupillography were obtained at baseline, 1st and 3rd month, and choroidal thicknesses and pupil diameter sizes were compared between the two groups...
September 22, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28929061/drug-induced-sleep-endoscopy-as-a-selection-tool-for-surgical-management-of-obstructive-sleep-apnoea-syndrome-our-personal-experience
#9
M B Bharathi, J Rajendra Prasad, K Satish
The role of Drug-induced sleep endoscopy as a selection tool for surgical management of obstructive sleep apnoea syndrome. SOURCE OF DATA: Polysomnography proved OSA patients, who are planned for surgery in dept. of ENT AND HEAD& NECK, JSS Hospital, Mysore. STUDY DESIGN: A prospective clinical study. METHOD: 30 Polysomnography proved OSA patients, age between 20 and 60 years have been selected for Drug Induced Sleep Endoscopy (DISE) after taking informed consent for proposed surgery...
September 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/28910892/-study-on-pharyngeal-wall-floppiness-of-patients-with-obstructive-sleep-apnea-hypopnea-syndrome-attributable-to-non-structural-factors
#10
Z Q Lin, K L Jiang, L Zhao, S N Li, S Shao, W Qian, Z Z Tao
Objective: Acoustic pharyngealmetry technology is utilized to evaluate the change and clinical significance of obstructive sleep apnea-hypopnea syndrome (OSAHS) patients caused by non-upper airway structural factor and normal individuals' PWF(pharyngeal wall floppiness). Methods: Acoustic pharyngealmetry instrument of Ecconvision was utilized to examine 102 OSAHS patients and 50 normal individuals, separately recorded their volume of pharyngeal cavity in sit or supine position, calculated PWF in sit or supine position, and SPSS 12...
September 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28903962/an-evaluation-of-intracameral-mydriasis-for-routine-cataract-surgery
#11
Christopher B Schulz, Srini V Goverdhan, Roger C Humphry
BACKGROUND: Intracameral Mydrane might facilitate a more streamlined cataract service and improve the patient experience. There is limited 'real-world' evidence of its use in a UK setting. METHODS: As part of a local evaluation of cataract surgery using intracameral Mydrane (group 2; n=60), data were collected on intraoperative pupil size and postoperative visual acuity (VA), as well as the rate of mechanical pupil dilation, intraoperative floppy iris syndrome (IFIS) and complications...
September 13, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28901745/terminating-dna-tile-assembly-with-nanostructured-caps
#12
Deepak K Agrawal, Ruoyu Jiang, Seth Reinhart, Abdul M Mohammed, Tyler D Jorgenson, Rebecca Schulman
Precise control over the nucleation, growth, and termination of self-assembly processes is a fundamental tool for controlling product yield and assembly dynamics. Mechanisms for altering these processes programmatically could allow the use of simple components to self-assemble complex final products or to design processes allowing for dynamic assembly or reconfiguration. Here we use DNA tile self-assembly to develop general design principles for building complexes that can bind to a growing biomolecular assembly and terminate its growth by systematically characterizing how different DNA origami nanostructures interact with the growing ends of DNA tile nanotubes...
October 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28880982/association-between-eyelid-laxity-and-obstructive-sleep-apnea
#13
Timothy P Fox, Jeffrey A Schwartz, Aimee C Chang, Fatemeh P Parvin-Nejad, Cindi K Yim, Steven H Feinsilver, Albert Y Wu
Importance: While much has been reported on the relationship between floppy eyelid syndrome and obstructive sleep apnea (OSA), the diagnostic criteria of floppy eyelid syndrome are often subjective and vague. Objective: To evaluate the association between OSA and quantitative markers of eyelid laxity or secondary ocular surface disease in a sleep clinic population. Design, Setting, and Participants: This investigation was a cross-sectional observational study at the Center for Sleep Medicine at Icahn School of Medicine at Mount Sinai...
October 1, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28816914/congenital-hypotonia-in-toddlerhood
#14
Naomi Steiner, Alcy Torres, Arathi Reddy, Marilyn Augustyn
David is a 22-month-old boy who is new to your practice. He recently moved from a rural area in the Midwest. His father is in the United States Air Force, and his mother works as a full-time homemaker. Their household includes 5 older siblings. The family moves every year because of the father's Air Force placement.David was born full-term in Virginia, with no reported pregnancy complications and no alcohol, tobacco, or drug exposure. He was delivered vaginally, with Apgar scores of 7 and 9, respectively and no respiratory issues...
September 2017: Journal of Developmental and Behavioral Pediatrics: JDBP
https://www.readbyqxmd.com/read/28802364/the-reliability-of-flexible-nasolaryngoscopy-in-the-identification-of-vocal-fold-movement-impairment-in-young-infants
#15
Yi-Chun Carol Liu, Tyler McElwee, Mary Musso, Tara L Rosenberg, Julina Ongkasuwan
OBJECTIVE: Flexible nasolaryngoscopy (FNL) is considered the gold standard for evaluation of vocal fold mobility but there has been no data on the reliability of interpretation in the infant population. Visualization may be limited by excessive movement, secretions, or floppy supraglottic structures that prevent accurate diagnosis of vocal fold movement impairment (VFMI). We sought to evaluate the inter- and intra-rater reliability of FNL for the evaluation of VFMI in young infants. STUDY TYPE: Case-control...
September 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28777608/topological-control-on-the-structural-relaxation-of-atomic-networks-under-stress
#16
Mathieu Bauchy, Mengyi Wang, Yingtian Yu, Bu Wang, N M Anoop Krishnan, Enrico Masoero, Franz-Joseph Ulm, Roland Pellenq
Upon loading, atomic networks can feature delayed irreversible relaxation. However, the effect of composition and structure on relaxation remains poorly understood. Herein, relying on accelerated molecular dynamics simulations and topological constraint theory, we investigate the relationship between atomic topology and stress-induced structural relaxation, by taking the example of creep deformations in calcium silicate hydrates (C─S─H), the binding phase of concrete. Under constant shear stress, C─S─H is found to feature delayed logarithmic shear deformations...
July 21, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28771680/safety-and-efficacy-of-rescue-flexible-bronchoscopic-intubation-using-the-bentson-floppy-tip-guidewire-via-a-supraglottic-airway-in-critically-ill-children
#17
D Cross, A Nyman, P James, A Durward
Difficulty in tracheal intubation in paediatric intensive care patients is associated with increased morbidity and mortality. Delays to intubation and interruption to oxygenation and ventilation are poorly tolerated. We developed a safe and atraumatic tracheal intubation technique. A floppy-tipped guidewire and airway exchange catheter were placed to a pre-determined length under bronchoscopic guidance while oxygenation and ventilation was maintained via a supraglottic airway device (SAD). We performed a retrospective review of this technique on patients who were either known to have or who had an unexpected difficultly in intubation...
November 2017: Anaesthesia
https://www.readbyqxmd.com/read/28767116/a-surprising-way-to-control-the-charge-transport-in-molecular-electronics-the-subtle-impact-of-the-coverage-of-self-assembled-monolayers-of-floppy-molecules-adsorbed-on-metallic-electrodes
#18
Ioan Bâldea
Inspired by earlier attempts in organic electronics aiming at controlling charge injection from metals into organic materials by manipulating the Schottky energy barrier using self-assembled monolayers (SAMs), recent experimental and theoretical work in molecular electronics showed that metal-organic interfaces can be controlled via changes in the metal work function that are induced by SAMs. In this paper we indicate a different route to achieve interface-driven control over the charge transfer/transport at the molecular scale...
October 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28750369/matrix-metalloproteinase-polymorphisms-in-patients-with-floppy-mitral-valve-mitral-valve-prolapse-fmv-mvp-and-fmv-mvp-syndrome
#19
Sarah M Lima, Antonios A Pitsis, Timotheos G Kelpis, Mohamed H Shahin, Taimour Y Langaee, Larisa H Cavallari, Efstratios K Theofilogiannakos, Harisios Boudoulas, Konstantinos Dean Boudoulas
BACKGROUND: It has been suggested that collagen abnormalities of the mitral valve are present in patients with floppy mitral valve (FMV)/mitral valve prolapse (MVP). Genetic factors determining collagen synthesis and degradation have not been well defined in these patients. This study was undertaken to determine whether selective polymorphisms of matrix metalloproteinase-2 (MMP2) or transforming growth factor-β (TGFβ), with known or putative effects on collagen turnover, are more frequent in FMV/MVP...
July 28, 2017: Cardiology
https://www.readbyqxmd.com/read/28749055/a-failure-to-be-candid
#20
Jennifer McGuirl
I was a second-year neonatal-perinatal fellow in a meeting between other members of the neonatal intensive care team and parents who had just received devastating news about their planned-for and highly desired baby, born after what had been an uncomplicated pregnancy. At home, a little sister was waiting to meet her new brother. These conversations are never easy, but this one I found particularly disturbing. John had been born at term via emergency cesarean section after his mother, Muriel, had come for a routine obstetrical visit and reported decreased fetal movement...
July 2017: Hastings Center Report
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