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https://www.readbyqxmd.com/read/28412810/ultraviolet-light-makes-dgmp-floppy-femtosecond-stimulated-raman-spectroscopy-of-2-deoxyguanosine-5-monophosphate
#1
Joohyun Lee, J Reddy Challa, David W McCamant
The ultrafast dynamics of 2'-deoxyguanosine 5'-monophosphate (dGMP) after excitation with ultraviolet light has been studied with femtosecond transient absorption (TA) and femtosecond stimulated Raman spectroscopy (FSRS). TA kinetics and transient anisotropy spectra reveal a rapid relaxation from the Franck-Condon region, producing an extremely red-shifted stimulated emission band at ~440-nm that is formed after 200 fs and subsequent relaxation 0.8-1.5 ps, consistent with prior studies. Viscosity dependence shows that the initial relaxation, prior to 0...
April 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28374870/transoral-robotic-surgery-tors-a-new-tool-for-high-risk-tracheostomy-decannulation
#2
F Montevecchi, G Cammaroto, G Meccariello, P T Hoff, R M Corso, C Galletti, M F H Al-Rawashdeh, C Vicini
Tracheostomy decannulation has always been considered a procedure with an attendant risk, especially in patients with a reduced upper airway diameter as is commonly observed in the obstructive sleep apnoea (OSA) population. We report on 4 cases where transoral robotic surgery (TORS) helped in the management of long-term cannulated patients. The aims of our paper are: 1. To demonstrate how the otolaryngology team can help identify patients at high risk for decannulation failure; and 2. To demonstrate how TORS may aid in the decannulation process of patients at high risk for failure due to severe tongue base hypertrophy...
February 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28330990/on-the-growth-and-form-of-shoots
#3
Raghunath Chelakkot, L Mahadevan
Growing plant stems and shoots exhibit a variety of shapes that embody growth in response to various stimuli. Building on experimental observations, we provide a quantitative biophysical theory for these shapes by accounting for the inherent observed passive and active effects: (i) the active controllable growth response of the shoot in response to its orientation relative to gravity, (ii) proprioception, the shoot's growth response to its own observable current shape, and (iii) the passive elastic deflection of the shoot due to its own weight, which determines the current shape of the shoot...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28323432/electronic-structures-and-oh-induced-atmospheric-degradation-of-cf3nsf2-a-potential-green-dielectric-replacement-for-sf6
#4
Lin Cheng, Xiaojuan Yu, Kun Zhao, Hua Hou, Baoshan Wang
Electronic structures of [(trifluoromethyl)imino]sulfur difluoride (CF3NSF2) and degradation mechanisms by hydroxyl radical have been investigated using density functional theory (M06-2X), the complete basis set quadratic CBS-Q, and the explicitly correlated coupled-cluster methods [CCSD(T)-F12]. The d-function augmented correlation-consistent basis sets including triple- and quadruple-ξ were employed for the sulfur-containing species. It was found that CF3NSF2 exists as two conformations connected by the internal rotation of CF3 around the central NS bond...
March 28, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28317682/intraocular-lens-scaffold-technique-to-prevent-posterior-capsule-rupture-in%C3%A2-cases%C3%A2-of-morgagnian-cataract
#5
Rohit Om Parkash, Shruti Mahajan, Tushya Om Parkash, Vittal Nayak
We describe a technique for performing safe phacoemulsification of a Morgagnian cataract using the intraocular lens (IOL) scaffold. An IOL scaffold has been used in cases in which posterior capsule rupture has occurred, leaving nonemulsified nuclear pieces. The scaffold provides a barrier that prevents the nuclear fragments from falling posteriorly into the vitreous cavity. Our technique uses the IOL as a scaffold to prevent the vulnerable posterior capsule from rupturing during nuclear emulsification in Morgagnian cataract...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28270403/floppy-eyelid-syndrome-delayed-diagnosis-is-not-desired
#6
Amar Pujari, Mandeep S Bajaj, Srikant Kumar Padhy, Divya Agarwal
No abstract text is available yet for this article.
March 7, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28257133/phytotherapy-and-intraoperative-floppy-iris-syndrome-the-implications
#7
M Tsatsos, C MacGregor, I Athanasiadis, M Moschos, A Mataftsi, N Ziakas
No abstract text is available yet for this article.
March 3, 2017: Eye
https://www.readbyqxmd.com/read/28230164/dynamical-majorana-edge-modes-in-a-broad-class-of-topological-mechanical-systems
#8
Emil Prodan, Kyle Dobiszewski, Alokik Kanwal, John Palmieri, Camelia Prodan
Mechanical systems can display topological characteristics similar to that of topological insulators. Here we report a large class of topological mechanical systems related to the BDI symmetry class. These are self-assembled chains of rigid bodies with an inversion centre and no reflection planes. The particle-hole symmetry characteristic to the BDI symmetry class stems from the distinct behaviour of the translational and rotational degrees of freedom under inversion. This and other generic properties led us to the remarkable conclusion that, by adjusting the gyration radius of the bodies, one can always simultaneously open a gap in the phonon spectrum, lock-in all the characteristic symmetries and generate a non-trivial topological invariant...
February 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28208546/re-assessment-of-urologists-knowledge-of-intraoperative-floppy-iris%C3%A2-syndrome
#9
David S Wang
No abstract text is available yet for this article.
March 2017: Journal of Urology
https://www.readbyqxmd.com/read/28176044/lens-management-of-cataract-surgery-cataract-prevention-and-floppy-iris-syndrome
#10
Joao Crispim, Wallace Chamon
According to the World Health Organization, cataract is the major cause of reversible visual impairment in the world. It is present as the cause of decreased visual acuity in 33% of the visual impaired citizens. With the increase of life expectancy in the last decades, the number of patients with cataract is expected to grow for the next 20 years. Nowadays, the only effective treatment for cataracts is surgery and its surgical outcomes have been increasingly satisfactory with the technological advancement...
February 8, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28162794/corrigendum-to-combined-medial-canthopexy-and-lateral-tarsal-strip-for-floppy-eyelid-syndrome-am-j-otolaryngol-37-2016-240-244
#11
Christopher J Compton, Andrew T Melson, Jeremy D Clark, Taha Z Shipchandler, William R Nunery, H B Harold Lee
No abstract text is available yet for this article.
February 2, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28138983/a-floppy-hat-shaped-reconstruction-for-giant-coronary-ostial-aneurysms-after-a-bentall-operation
#12
Seok In Lee, Chang Hyu Choi, Kook Yang Park, Chul-Hyun Park
No abstract text is available yet for this article.
January 30, 2017: Journal of Cardiac Surgery
https://www.readbyqxmd.com/read/28112155/transformable-topological-mechanical-metamaterials
#13
D Zeb Rocklin, Shangnan Zhou, Kai Sun, Xiaoming Mao
Mechanical metamaterials are engineered materials whose structures give them novel mechanical properties, including negative Poisson's ratios, negative compressibilities and phononic bandgaps. Of particular interest are systems near the point of mechanical instability, which recently have been shown to distribute force and motion in robust ways determined by a nontrivial topological state. Here we discuss the classification of and propose a design principle for mechanical metamaterials that can be easily and reversibly transformed between states with dramatically different mechanical and acoustic properties via a soft strain...
January 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28112140/a-rare-case-of-pachydermoperiostosis-associated-with-blepharoptosis-and-floppy-eyelids
#14
Bipasha Mukherjee, Md Shahid Alam
Pachydermoperiostosis (PDP) is a multisystem disorder of mesenchymal origin. It is a form of hypertrophic osteoarthropathy. The typical clinical features include pachydermia, cutis verticus gyrata, digital clubbing, and periostosis. Patients present with mechanical ptosis resulting from markedly thickened eye lids. Floppy eye lids have rarely been reported in association with PDP. We describe a rare case of PDP associated with ptosis and floppy eye lids in an adult male. Meibomian gland dysfunction was documented by meibography...
December 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28093089/atrial-septal-defect-with-right-to-left-shunt-in-the-absence-of-pulmonary-hypertension
#15
Devi A Manuel, Gopal C Ghosh, Anoop G Alex
We describe the case of a 27-year-old gentleman who developed late-onset clubbing and cyanosis. Transoesophageal echocardiography revealed a 27-mm ostium secundum atrial septal defect and a large, floppy Eustachian valve directing right atrial blood to the left side of the heart.
January 17, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28003734/debs-a-unification-theory-for-dry-eye-and-blepharitis
#16
James M Rynerson, Henry D Perry
For many years, blepharitis and dry eye disease have been thought to be two distinct diseases, and evaporative dry eye distinct from aqueous insufficiency. In this treatise, we propose a new way of looking at dry eye, both evaporative and insufficiency, as the natural sequelae of decades of chronic blepharitis. Dry eye is simply the late form and late manifestation of one disease, blepharitis. We suggest the use of a new term in describing this one chronic disease, namely dry eye blepharitis syndrome (DEBS)...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28000820/stability-of-2-3-and-3-5-cyclic-nucleotides-in-formamide-and-in-water-a-theoretical-insight-into-the-factors-controlling-the-accumulation-of-nucleic-acid-building-blocks-in-a-prebiotic-pool
#17
Giuseppe Cassone, Jiří Šponer, Franz Saija, Ernesto Di Mauro, A Marco Saitta, Judit E Šponer
Synthesis of the first RNAs represents one of the cornerstones of the emergence of life. Recent studies demonstrated powerful scenarios of prebiotic synthesis of cyclic nucleotides in aqueous and formamide environments. This raised a question about their thermodynamic stability, a decisive factor determining their accumulation in a prebiotic pool. Here we performed ab initio molecular dynamics simulations at various temperatures in formamide and water to study the relative stabilities of the 2',3' and 3',5' isomers of cyclic nucleotides...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27999697/modified-surgical-techniques-for-managing-intraoperative-floppy-iris-syndrome
#18
Pornchai Simaroj, Kaevalin Lekhanont, Puwat Charukamnoetkanok
Purpose. To report a modified surgical strategy in the management of intraoperative floppy iris syndrome-associated iris prolapse. Methods. Prolapsed iris is left as is and a new corneal incision near the original wound but at a different site is created. Depending on the location of the original incision and the surgeon's preference, this additional incision can be used as a new port for phacoemulsification tip or can be the new site for the iris to securely prolapse, allowing for the surgery to proceed safely...
2016: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/27910450/first-order-reversal-curves-forc-analysis-of-individual-magnetic-nanostructures-using-micro-hall-magnetometry
#19
Merlin Pohlit, Paul Eibisch, Maryam Akbari, Fabrizio Porrati, Michael Huth, Jens Müller
Alongside the development of artificially created magnetic nanostructures, micro-Hall magnetometry has proven to be a versatile tool to obtain high-resolution hysteresis loop data and access dynamical properties. Here we explore the application of First Order Reversal Curves (FORC)-a technique well-established in the field of paleomagnetism for studying grain-size and interaction effects in magnetic rocks-to individual and dipolar-coupled arrays of magnetic nanostructures using micro-Hall sensors. A proof-of-principle experiment performed on a macroscopic piece of a floppy disk as a reference sample well known in the literature demonstrates that the FORC diagrams obtained by magnetic stray field measurements using home-built magnetometers are in good agreement with magnetization data obtained by a commercial vibrating sample magnetometer...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27878578/the-double-guidewire-approach-for-transcoronary-pacing-in-a%C3%A2-porcine-model
#20
K M Heinroth, S Unverzagt, D Mahnkopf, S Frantz, R Prondzinsky
BACKGROUND: Transcoronary pacing is used for treatment of unheralded bradycardias in the setting of percutaneous coronary interventions (PCI). OBJECTIVES: In the present study we introduced a new concept - the double guidewire approach - for transcoronary pacing in a porcine model. METHODS: Transcoronary pacing was applied in 16 adult pigs under general anaesthesia in an animal catheterization laboratory. A special guidewire with electrical insulation by PTFE coating except for the distal part of the guidewire was positioned in the periphery of a coronary artery serving as the cathode...
November 23, 2016: Medizinische Klinik, Intensivmedizin und Notfallmedizin
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