Journal of Voice
- Assessing and Quantifying Air Added to the Voice by Means of Laryngostroboscopic Imaging, EGG, and Acoustics in Vocally Trained SubjectsTo assess and quantify singers’ strategies for adding air to phonation to sound “breathy” in a healthy manner
- Exercise Science and the VocalistThe application of exercise science training knowledge has been of growing interest to voice professionals. This tutorial, derived from the authors’ invited presentations from the “Exercise and the Voice” Special Session at the 2018 Voice Foundation Symposium, proposes a foundational theoretical structure based in exercise science, clarifies the wide range of variables that may influence voice training, and summarizes our present understanding of
- Operative and Conservative Management of Laryngeal Contact Granuloma: A Network Analysis and Systematic ReviewLaryngeal contact granuloma is a disease of benign hypertrophic granulation tissue at the medial side of vocal process. Numerous studies of conservative and surgical management have reported effectiveness, yet optimal treatment has not been standardized. We compared primary and secondary outcomes of conservative and surgical treatment using endoscopic grading, Voice Handicap Index-10 (VHI-10), maximum phonation time (MPT), and recurrence rate.
- A computational study of the effects of vocal fold stiffness parameters on voice productionA three-dimensional flow-structure interaction model of voice production is used to investigate the effect of the stiffness parameters of vocal fold layers on voice production. The vocal fold is modeled as a three-layer structure consisting of the cover, ligament, and body layers. All the three layers are modeled as transversely isotropic materials for which the stiffness parameters include the transverse elastic modulus and longitudinal elastic
Medgadget
- Medtronic Launches Evolut Pro+ TAVR System: Interview with Dr. Pieter KappeteinLast month, Medtronic announced receipt of U.S. Food and Drug Administration (FDA) approval for and launch of the Evolut Pro+ TAVR (Transcatheter Aortic Valve Replacement) System to treat patients with symptomatic severe aortic stenosis. Aortic stenosis is characterized by stiff, often thickened aortic valve leaflets that struggle to open and close, requiring the heart to work harder to pump blood throughout the body. Chronic, untreated patients
- FDA Clears geko Muscle Pump Activator to Prevent VTEVenous thromboembolism (VTE) too often strikes bedridden patients in the hospital, and this is one of the main reasons that patients are put back on their feet as soon as possible. Inflatable wraps placed around the legs, which can raise the pressure, are a common way to prevent the condition. Now, a device called geko from Sky Medical Technology, a U.K. firm, has just been cleared by the FDA to stimulate the calf muscles, in turn increasing bloo
- 3D Liquid-Cell Electron Microscopy Imaging Now PossibleElectron microscopy revealed a world that exists at scales smaller than the wavelength of light. Advancements in this field have allowed scientists to visualize ever more objects and processes, but actually seeing living cells in 3D and within a liquid environment has been impossible. Now, a team of researchers from Penn State University, Virginia Tech, and a company called Protochips have developed a system that allows for an electron mic
- Peptide Particles Ferry Drugs Across Blood-Brain BarrierMost drugs, genetic materials, and other therapeutic agents are very difficult to use inside the brain because of the blood-brain barrier. There have been attempts to use ultrasound and microbubbles to create temporary passages through the barrier, including as a possible therapy for Alzheimer’s disease, but this is approach is not easy or ideal. Now, researchers from Newcastle University in the U.K. have used a peptide (chain of amino ac
Angewandte Chemie International Edition
- The quasi‐binary acetonitriletriide Sr3[C2N]2The first quasi‐binary acetonitriletriide Sr3[C2N]2 has been synthesised and characterised. The near colourless crystals were grown by a reaction of Sr metal, graphite and elemental N2, from decomposed Sr(N3)2, in a sealed Ni ampoule with the aid of an alkali metal flux. The structure of this compound was analysed via single crystal X‐ray diffraction and the identity of the [C2N]3− anion was confirmed by Raman spectroscopy and further investigate
- Organocatalytic Asymmetric Annulation of ortho‐Alkynylanilines: Synthesis of Axially Chiral Naphthyl‐C2‐indolesCertified organic: A chiral Brønsted base catalyzed asymmetric annulation of ortho‐alkynylanilines was developed to access axially chiral naphthyl‐C2‐indoles via vinylidene ortho‐quinone methide (VQM) intermediates. This strategy provides a unique organocatalytic atroposelective route to axially chiral aryl‐C2‐indole skeletons with excellent enantioselectivity and functional‐group tolerance. Abstract A chiral Brønsted base catalyzed asymmet
- From Bad Electrochemical Practices to an Environmental and Waste Reducing Approach for the Generation of Active Hydrogen Evolving ElectrodesThe use of a platinum counter electrode for the evaluation of non‐PGM based electrodes can be seen as bad electrochemical practice. Herein, it was done intentionally and this strategy turned out to be a zero‐waste‐approach for the generation of highly active and stable HER electrocatalysts. Abstract The electrodeposition of noble metals using corresponding dissolved metal salts represents an interesting process for the improvement of the el
- Bifunctional Phosphine Ligand Enabled Gold‐Catalyzed Alkynamide Cycloisomerization: Access to Electron‐Rich 2‐Aminofurans and Their Diels–Alder AdductsWhat a ligand! With bifunctional ligands specifically designed for gold catalysis, acetylenic amides are efficiently transformed into 2‐aminofurans in a single step. The highly electron‐rich nature of these furans makes them difficult to access by other means, but also endows them with exceptional synthetic value. D‐A=Diels–Alder, EWG=electron‐withdrawing group. Abstract By using biphenyl‐2‐ylphosphines functionalized with a remote tertiary
- Butenolide Derivatives of Biobased Furans: Sustainable Synthetic DyesTo dye for: Synthetic dyes are yet another industrial commodity that can be sustainably produced wholly from biomass‐derived platform molecules. The synthesis of biobased dyes containing strong chromophores that lead to bright colors in the yellow to red region of the visible spectrum is described. Abstract The dye and pigment manufacturing industry is one of the most polluting in the world. Each year, over one million tons of petrochemical
- Homochiral MOF–Polymer Mixed Matrix Membranes for Efficient Separation of Chiral MoleculesSuperior separation: Homochiral MOF–polymer mixed matrix membranes (MMMs) are synthesized by incorporation of amino acid functionalized MIL‐53‐NH2 into the polyethersulfone (PES) matrix. The homochiral MIL‐53‐NH‐amino acid‐PES MMM exhibits excellent enantioselectivity towards racemic 1‐phenylethanol with enantiomeric excess values up to 100 %. Abstract Homochiral metal–organic framework (MOF) membranes have been recently reported for chiral
- A Chiral Polycyclic Aromatic Hydrocarbon Monkey SaddleA contorted polycyclic aromatic hydrocarbon (PAH) in the shape of a monkey saddle has been synthesized in three steps from a readily available truxene precursor. The monkey saddle PAH is consisting of three five‐, seven six‐, and three eight‐membered rings and has been unambiguously characterized by single‐crystal X‐ray diffraction. Due to the three biaryl axes the monkey saddle PAH is inherently chiral. The inversion of the two enantiomeric stru
- A Carbene‐Extended ATRA Reaction2+1 ATRA: A three‐component radical addition reaction between alkyl halides, TMSCHN2, and alkynes under mild conditions (RT, 5 h) with a commercial catalyst (CoBr2, dppbz) has been developed. This constitutes a significant extension of conventional (two‐component) atom‐transfer radical addition (ATRA) reactions through the incorporation of a carbenoid precursor, which results in an overall 1,3‐functionalization. Abstract Atom‐transfer radic
- Controlling the White‐Light Generation of [(RSn)4E6]: Effects of Substituent and Chalcogenide VariationIn search of the preconditions for the generation of highly directed white‐light by means of amorphous molecular materials of the general formula [(RT)4E6] (R=organic group, T/E=Group 14/16 elements), nine new compounds were studied. Surprisingly, R does not need to be an aromatic ligand, in striking contrast to previous assumptions. Abstract Adamantane‐type organotin chalcogenide clusters of the general composition [(RT)4S6] (R=aromatic su
- Dispersed Nickel Cobalt Oxyphosphide Nanoparticles Confined in Multichannel Hollow Carbon Fibers for Photocatalytic CO2 ReductionNickel cobalt oxyphosphide nanoparticles (NiCoOP NPs) were confined in multichannel hollow carbon fibers (MHCFs) for CO2 photoreduction. The highly dispersed mixed metal oxyphosphide NPs provide abundant active sites for photoreduction, while the multichannel hollow carbon support prevents NPs from aggregation and facilitates electron‐hole transport, enabling efficient CO2 reduction under visible light. Abstract Materials for high‐efficienc
- Stepwise Evolution of Molecular Nanoaggregates Inside the Pores of a Highly Flexible Metal–Organic FrameworkSolvent‐to‐guest exchange and sliding nets trigger eugenol nanoaggregate formation inside the pores of a flexible pillared metal–organic framework. A detailed description of the different steps of guest aggregation in the nanoconfined environment is furnished by a series of unique crystallographic snapshots. Abstract The crystalline sponge method (CSM) is primarily used for structural determination by single‐crystal X‐ray diffraction of a s
- Ultrafast Intercalation Enabled by Strong Solvent–Host Interactions: Understanding Solvent Effect at the Atomic LevelA solvent effect is seen in the solution‐phase intercalation of ferrocene into layered vanadyl phosphate to form an organic–inorganic superlattice. The drastically different intercalation kinetics in primary alcohols following a volcano shape is understood at the atomic level as a result of solvent pre‐intercalation. Abstract Solvents play an essential role in many areas of chemistry and is the cornerstone of understanding reactivity in sol
- Dearomative Dual Functionalization of Aryl IodanesRoom for two: The success of a novel rearrangement/addition sequence for the dearomatization of aryl iodanes hinges on the rapid rearrangement (−78 °C, 10 min), which allows for the low‐temperature trapping of unstable dearomatized intermediates with an array of nucleophiles (see scheme). The introduction of an α‐stannyl nitrile and then a second nucleophile enabled the synthesis of a wide range of polysubstituted alicyclic compounds. Abstra
- Boosting Water Oxidation through In Situ Electroconversion of Manganese Gallide: An Intermetallic Precursor ApproachPartnership in action: Electrocorrosion and concomitant leaching of gallium from the structurally compelling intermetallic manganese gallide MnGa4 lead to a highly active electrocatalyst system for water oxidation in alkaline media. Under the electrochemical reaction conditions, three distinct crystalline and highly active MnOx phases result simultaneously with considerably low overpotentials and durability of over five days. Abstract For t
- The Feasibility of Electrochemical Ammonia Synthesis in Molten LiCl–KCl EutecticsThe key challenges and opportunities of using molten LiCl eutectics as media for the direct electrochemical reduction of N2 to ammonia are identified. By adding LiH, rather than Li3N, N2 can be reduced to N3− while stoichiometric amounts of H− are oxidised to H2. The H2 can then react spontaneously with N3− to form NH3, regenerating H− and closing the catalytic cycle. Abstract Molten LiCl and related eutectic electrolytes are known to permi
- The Simplest, Isolable, Alkynyl Isocyanate HC≡CNCO: Synthesis and CharacterizationThe simplest alkynyl isocyanate, namely HC≡CNCO, has been successfully isolated as neat substance. In sharp contrast to the previous described instability, HC≡CNCO is stable enough at room temperature for characterization with IR, UV/Vis, and NMR spectroscopy. Abstract Alkynyl isocyanates have been postulated as highly reactive intermediates in synthetic chemistry. Herein, the parent molecule HC≡CNCO is isolated for the first time. In sharp
- Transition‐Metal‐Free Acceptorless Decarbonylation of Formic Acid Enabled by a Liquid Chemical‐Looping StrategyIn the loop: Selective and acceptorless decarbonylation of formic acid was achieved for the first time under transition‐metal‐free conditions. The approach, inspired by chemical‐looping strategies, shuts down the thermodynamically favored dehydrogenation of formic acid, yielding a pure stream of CO without H2 or CO2 contamination. Abstract The selective decarbonylation of formic acid was achieved under transition‐metal‐free conditions. Usin
- Enzyme‐Mediated Endogenous and Bioorthogonal Control of a DNAzyme Fluorescent Sensor for Imaging Metal Ions in Living CellsLight up: Reported here is the endogenous and bioorthogonal activation of a DNAzyme fluorescent sensor containing an 18‐base pair recognition site of a homing endonuclease (I‐SceI). Once I‐SceI is expressed inside cells it cleaves at the recognition site, allowing the DNAzyme to adopt its active conformation and catalyze cleavage of a substrate strand in the presence of Mg2+ to release the fluorophore‐labeled DNA fragment and produce a fluorescen
- Multi‐Resonance Induced Thermally Activated Delayed Fluorophores for Narrowband Green OLEDsBy amplifying the influence of skeleton and the peripheral acceptor units, a series of highly efficient green‐emitting MR‐TADF materials were obtained. MR‐TADF emitters with photo‐luminance quantum yields of above 90 % with full width at half maxima of ≤25 nm were realized. The corresponding organic light‐emitting diodes show maximum external quantum efficiency/ power efficiency of 22.02 %/ 69.82 lm W−1 with excellent long‐term stability. Ab
- A Simple and Efficient Device and Method for Measuring the Kinetics of Gas‐Producing ReactionsBursting the bubble: Quick, easy and accurate Arrhenius plots from a single experiment were obtained. By using a new device for quantifying gases or gas mixtures based on the simple principle of bubble counting, it is possible to follow reaction kinetics down to volume step sizes of 8–12 μL. Abstract We present a new device for quantifying gases or gas mixtures based on the simple principle of bubble counting. With this device, we can follo
- Inorganic–Organic Hybrid Polyoxoniobates: Polyoxoniobate Metal Complex Cage and Cage FrameworkHybrid polyoxoniobate cages: A series of polyoxoniobate (PONb) metal complex cage materials have been made, thus fusing two areas, namely PONbs and MOFs. The cage materials are by far the largest inorganic–organic hybrid PONbs and hold promise for the developments of both novel cage materials and largely unexplored inorganic–organic hybrid PONb chemistry. Abstract The combination of polyoxoniobates (PONbs) with 3d metal ions, azoles, and or
- David William Lupton“My greatest achievement has been learning how to convert concepts to practice. My worst nightmare is a world in which change occurs without deep analysis of its impact …” Find out more about David W. Lupton in his Author Profile.
- Donor–Acceptor Nanocarbon Ensembles to Boost Metal‐Free All‐pH Hydrogen Evolution Catalysis by Combined Surface and Dual Electronic ModulationA metal‐free hydrogen evolution catalyst with low overpotentials and unprecedented durability in acidic, basic, and neutral media is presented by X. Chen, D. Yu et al. in their Research Article (DOI: https://doi.org/10.1002/anie.20190782610.1002/anie.201907826). An N‐doped porous carbon framework is coupled with carbon nanotubes into all‐carbon acceptor–donor ensembles, followed by subsequent surface modification with carboxy‐group‐rich polymers.
- Scalable Rhodium(III)‐Catalyzed Aryl C−H Phosphorylation Enabled by Anodic Oxidation Induced Reductive EliminationElectrochemically driven rhodium(III)‐catalyzed aryl C−H phosphorylation reactions proceed by H2 evolution without the need for sacrificial chemical oxidants, as described by T.‐B. Wen, H.‐J. Zhang, H.‐C. Xu, and co‐workers in their Communication (DOI: https://doi.org/10.1002/anie.20190995110.1002/anie.201909951). A key step of the electrosynthesis involves anodic oxidation of a rhoda(III)cycle to a higher oxidation state to induce reductive elim
- Enantiospecific Desorption Triggered by Circularly Polarized LightExposing racemic samples of 1,1′‐bi‐2‐naphthol (BINOL) coated onto achiral glass substrates to right or left circularly polarized light leads to preferential desorption of one or the other enantiomer. In their Communication (DOI: https://doi.org/10.1002/anie.20190663010.1002/anie.201906630), H. Iglev, A. Kartouzian and co‐workers show how this effect can be exploited for contamination‐free enantioenrichment. A simplified phenomenological model su
- Strong N−X···O−N Halogen Bonds: Comprehensive Study on N‐Halosaccharin Pyridine N‐oxide ComplexesA detailed study of the strong N−X⋯−O−N+ (X = I, Br) halogen bonding interactions in solution and in the solid‐state reports 2×27 donor×acceptor complexes of N‐halosaccharins and pyridine N‐oxides (PyNO). Density Functional Theory (DFT) calculations were used to investigate the X···O halogen bond (XB) interaction energies in 54 complexes. The XB interaction energies were found to vary from –47.5 to –120.3 kJ mol–1, with the strongest N−I⋯−O−N+ XB
- Asymmetric Synthesis of Oxa‐Bridged Oxazocines by Rh(II)/Zn(II) Relay Catalytic [4+3] Cycloaddition ReactionThe oxa‐bridged oxazocines bearing three chiral carbon centers were synthesized efficiently through a dual‐metallic catalytic asymmetric tandem reaction of β,γ‐unsaturated α‐ketoesters with diazoimides. The process contained a rhodium‐promoted in situ generation of isomünchnone from diazoimide decomposition, and a chiral N,N’ ‐dioxide‐Zn(II) complex‐catalyzed intermolecular [4+3]‐cycloaddition of β,γ‐unsaturated α‐ketoester. Ligand‐acceleration
- Photoinduced Deoxygenative Borylations of Aliphatic AlcoholsA photochemical method for converting aliphatic alcohols into boronic esters is described. Preactivation of the alcohol as a 2‐iodophenyl‐thionocarbonate enables a novel Barton‐McCombie‐type radical deoxygenation that proceeds efficiently with visible light irradiation and without the requirement for a photocatalyst, a radical initiator, or tin or silicon hydrides. The resultant alkyl radical is intercepted by bis(catecholato)diboron, furnishing
- Cyclic Alkenylsulfonyl Fluorides: Palladium‐Catalyzed Synthesis and Functionalization of Compact Multi‐functional ReagentsA series of low molecular weight, compact and multifunctional cyclic alkenylsulfonyl fluorides are efficiently prepared from the corresponding alkenyl triflates. Palladium catalyzed sulfur dioxide insertion, using the surrogate reagent DABSO, achieves sulfinate formation, before trapping with an F‐electrophile delivers the sulfonyl fluorides. A broad range of functional groups can be tolerated, and a correspondingly large collection of derivatiza
- Magnetic Field Directed Rare‐Earth SeparationsThe separation of rare‐earth ions from one another is challenging due to their chemical and physical similarities. Nearly all rare‐earth separations rely upon small changes in ionic radii to direct speciation or reactivity. Herein, we show that the intrinsic magnetic properties of the rare‐earth ions impact the separations of light/heavy and selected heavy/heavy binary mixtures. Using TriNOx 3− ({(2‐ t BuNO)C 6 H 4 CH 2 } 3 N] 3− )
- Characterization of a Citrulline 4‐Hydroxylase from GE81112 Biosynthesis and Engineering of Its Substrate Specificity for the Chemoenzymatic Synthesis of EnduracididineThe GE81112 tetrapeptides are a small family of unusual non‐ribosomal peptide congeners with potent inhibitory activity against prokaryotic translation initiation. With the exception of the 3‐hydroxy‐L‐pipecolic acid unit, little is known about the biosynthetic origins of the non‐proteinogenic amino acid monomers of the natural product family. Here, we elucidate the biogenesis of the 4‐hydroxy‐L‐citrulline unit and establish the role of an iron‐
- Highly Regio‐, Diastereo‐, and Enantioselective Synthesis of Tetrahydroazepines and Benzo[b]oxepines via Palladium‐Catalyzed [4+3] Cycloaddition ReactionsA novel Pd(0)‐catalyzed asymmetric [4+3] annulation reaction of two readily accessible starting materials has been developed for building seven‐membered heterocyclic architectures. The potential [3+2] side pathway could be suppressed though fine tuning of the conditions. A broad scope of cycloaddition donors and acceptors participated in the transformation with excellent chemo‐, regio‐, diastereo‐ and enantioselectivtities, leading to valuable t
- Mechanistic Divergence in the Hydrogenative Synthesis of Furans and Butenolides: Ruthenium Carbenes Formed by gem‐Hydrogenation or via Carbophilic Activation of AlkynesEnynes with a tethered carbonyl substituent are converted into substituted furan derivatives upon hydrogenation using [Cp*RuCl] 4 as the catalyst. Paradoxically, this transformation can occur along two distinct pathways, each of which proceeds via discrete pianostool ruthenium carbenes. In the first case, hydrogenation and carbene formation are synchronized (“gem‐hydrogenation”), whereas the second pathway comprises carbene formation via carbop
- Cooperative Capture of Uranyl Ion by a Carbonyl‐Bearing Hierarchical‐Porous Cu‐Organic FrameworkTo efficiently capture the toxic uranyl ions (UO22+), a new hierarchical micro‐macroporous metal‐organic framework was prepared under template‐free conditions, featuring interconnected multi‐nanocages bearing carbonyl groups derived from a semi‐rigid ligand. The material exhibits the unusually high UO22+sorption capacity of 562 mg/g,which occurs in an intriguing two‐steps process, on the macropore‐based crystal surface and in the inner nanocages.
- Iodide‐methylammonium interaction is responsible for ferroelectricity in CH3NH3PbI3Excellent conversion efficiencies of over 20% and facile cell production have placed hybrid perovskites at the forefront of novel solar cell materials with CH3NH3PbI3 being its archetypal compound. The question why CH3NH3PbI3 has such extraordinary characteristics, particularly a very efficient power conversion from absorbed light to electrical power, is hotly debated with ferroelectricity being a promising candidate. This does, however, afford t
- In vivo Bioimaging of Porous CuxCoyS Supraparticles with High Reactive Oxygen Species Performance and Telomerase ResponsivityIn this study, we successfully synthesized Cu x Co y S supraparticles (SPs) on the nanoscale featuring multiple pores inside and strong absorption from 400 to 900 nm. Porous Cu x Co y S SPs produced the highest reactive oxygen species (ROS) yield (1.39) when illuminated by near‐infrared (NIR) light. Furthermore, we demonstrated that Cu x Co y S SPs could be used to identify cancer cells via intracellular telomerase responsive fluoresc
- Atomic Arrangement in Metal Doped NiS2 Boosts Hydrogen Evolution Reaction in Alkaline MediaWe report a novel modulation strategy by introducing transition metals in NiS 2 nanosheets (NSs) to flexibly optimize the electronic configurations and atomic arrangement. The Co‐NiS 2 NSs exhibit excellent HER performance with an overpotential of 80 mV at j = 10 mA cm ‐2 and long‐term stability of 90 h in alkaline media. The TOFs of 0.55 and 4.1 s ‐1 at an overpotential of 100 and 200 mV also confirm their remarkable performance. DFT c
- Hydrotrifluoromethylthiolation of Unactivated Alkenes and Alkynes with Trifluoromethanesulfonic Anhydride through Deoxygenative Reduction and Photoredox Radical ProcessesAn ongoing challenge in trifluoromethylthiolation reaction is the use of less expensive and easily available trifluoromethylthio sources. Herein we disclose an unprecedented usage of trifluoromethanesulfonic anhydride (Tf 2 O) as radical trifluoromethylthiolating reagent. The hydrotrifluoromethylthiolation of unactivated alkenes and alkynes with Tf 2 O in the presence of PMePh 2 and H 2 O under visible‐light photoredox catalysis gave the
ΩτοΡινοΛαρυγγολόγος Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,
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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com,
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00302841026182,
00306932607174,
alsfakia@gmail.com,
Anapafseos 5 Agios Nikolaos 72100 Crete Greece,
Medicine by Alexandros G. Sfakianakis,
Telephone consultation 11855 int 1193
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