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https://www.readbyqxmd.com/read/28535487/nerve-excitability-changes-related-to-muscle-weakness-in-chronic-progressive-external-ophthalmoplegia
#1
Antoine Gueguen, Claude Jardel, Marc Polivka, S Veronica Tan, Françoise Gray, Catherine Vignal, Anne Lombès, Olivier Gout, Hugh Bostock
OBJECTIVE: To explore potential spreading to peripheral nerves of the mitochondrial dysfunction in chronic progressive external ophthalmoplegia (CPEO) by assessing axonal excitability. METHODS: CPEO patients (n=13) with large size deletion of mitochondrial DNA and matching healthy controls (n=22) were included in a case-control study. Muscle strength was quantified using MRC sum-score and used to define two groups of patients: CPEO-weak and CPEO-normal (normal strength)...
April 26, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28535413/controllable-synthesis-and-luminescent-properties-of-rare-earth-doped-gd2-moo4-3-nanoplates
#2
Lei Zhang, Bohua Dong, Guohua Wang, Rongjie Gao, Ge Su, Wei Wang, Lixin Cao
For the first time, we have successfully synthesized rare-earth doped Gd2(MoO4)3: RE(3+) (RE=Eu, Tb) nanoplates by solvothermal method. The morphology of Gd2(MoO4)3 can be manipulated by changing the reaction times and reaction temperatures. The composition and surface morphology have been investigated by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), respectively. Under the excitation of UV, Photoluminescence (PL) has been used to explore the excellent luminescence properties of the synthesized nanophosphors...
April 21, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28535355/effect-of-composition-asymmetry-on-the-phase-separation-and-crystallization-in-double-crystalline-binary-polymer-blends-a-dynamic-monte-carlo-simulation-study
#3
Ashok Kumar Dasmahapatra
Polymer blends offer an exciting material for various potential applications due to their tunable properties by varying constituting components and their relative composition. Our simulation results unravel an intrinsic relationship between crystallization behavior and composition asymmetry. We report simulation results for non-isothermal and isothermal crystallization with weak and strong segregation strength to elucidate the composition dependent crystallization behavior. With increasing composition of low melting B-polymer, macrophase separation temperature changes non-monotonically, which is attributed to the non-monotonic change in diffusivity of both the polymers...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28535349/solitary-oxygen-dopant-emission-from-carbon-nanotubes-modified-by-dielectric-metasurfaces
#4
Xuedan Ma, Anthony R James, Nicolai F Hartmann, Jon K Baldwin, Jason Dominguez, Michael B Sinclair, Ting S Luk, Omri Wolf, Sheng Liu, Stephen K Doorn, Han Htoon, Igal Brener
All-dielectric metasurfaces made from arrays of high index nanoresonators supporting strong magnetic dipole modes have emerged as a low-loss alternative to plasmonic metasurfaces. Here we use oxygen-doped single-walled carbon nanotubes (SWCNTs) as quantum emitters and couple them to silicon metasurfaces to study effects of the magnetic dipole modes of the constituent nanoresonators on the photoluminescence (PL) of individual SWCNTs. We find that when in resonance, the magnetic mode of the silicon nanoresonators can lead to a moderate average PL enhancement of 0...
May 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535334/maximizing-the-photocatalytic-activity-of-metal-organic-frameworks-with-aminated-functionalized-linkers-sub-stoichiometric-effects-in-mil-125-nh2
#5
Matthew Chambers, Xia Wang, Laura Ellezam, Ovidiu Ersen, Marc Fontecave, Clément Sanchez, Laurence Rozes, Caroline Mellot-Draznieks
Despite the promise of utilizing metal-organic frameworks (MOFs) as highly tunable photocatalytic materials, systematic studies that interrogate the relationship between their catalytic performances and the amount of function-alized linkers are lacking. Aminated linkers are known to enhance the absorption of light and afford photocatalysis with MOFs under visible-light irradiation. However, the manner in which the photocatalytic performances are impacted by the amount of such linkers is poorly understood. Here, we assess the photocatalytic activity of MIL-125, a TiO2/1,4-benzenedicarboxylate (bdc) MOF for the oxidation of benzyl alcohol to benzaldehyde when increasing amounts of bdc-NH2 linkers (0%, 20%, 46%, 70% and 100%) are incorporated in the framework...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28535291/invited-commentary-continuing-to-loosen-the-constraints-on-epidemiology-in-an-age-of-change-a-comment-on-mcmichael-s-prisoners-of-the-proximate
#6
Sandro Galea
Published in 1999, McMichael's "Prisoners of the Proximate: Loosening the Constraints on Epidemiology in an Age of Change" (Am J Epidemiol. 1999;149(10):887-897) outlined an exciting vision for epidemiology as the field that that can help us better understand the drivers of population health so that we may intervene, paving the way for healthier populations. McMichael's paper remains today what it was when it was first published: clear, thoughtful, provocative, and usefully prescriptive in its call to action...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28534917/charge-stabilizing-tris-triphenylamine-zinc-porphyrin-carbon-nanotube-hybrids-synthesis-characterization-and-excited-state-charge-transfer-studies
#7
Luis M Arellano, Myriam Barrejón, Habtom B Gobeze, María J Gómez-Escalonilla, José Luis G Fierro, Francis D'Souza, Fernando Langa
Functionalization of single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs) with a charge stabilizing zinc porphyrin functionalized with triphenylamine entities has been accomplished. The synthetic approach involved the reaction of tris-(triphenylamine)porphyrinato zinc(ii) with iodobenzene functionalized nanotubes through a Sonogashira C-C cross coupling reaction under microwave irradiation conditions. Evidence of covalent functionalization and the extent of functionalization was obtained from systematic studies carried out by AFM, TGA, XPS and Raman spectroscopy techniques...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534900/interplay-between-many-body-effects-and-coulomb-screening-in-the-optical-bandgap-of-atomically-thin-mos2
#8
Youngsin Park, Sang Wook Han, Christopher C S Chan, Benjamin P L Reid, Robert A Taylor, Nammee Kim, Yongcheol Jo, Hyunsik Im, Kwang S Kim
Due to its unique layer-number dependent electronic band structure and strong excitonic features, atomically thin MoS2 is an ideal 2D system where intriguing photoexcited-carrier-induced phenomena can be detected in excitonic luminescence. We perform micro-photoluminescence (PL) measurements and observe that the PL peak redshifts nonlinearly in mono- and bi-layer MoS2 as the excitation power is increased. The excited carrier-induced optical bandgap shrinkage is found to be proportional to n(4/3), where n is the optically-induced free carrier density...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534896/coupling-between-the-photo-excited-cyclic-%C3%AF-system-and-the-4f-electronic-system-in-a-lanthanide-single-molecule-magnet
#9
K Kizaki, H Ozawa, T Kobayashi, R Matsuoka, Y Sakaguchi, A Fuyuhiro, T Fukuda, N Ishikawa
A new type of electronic interaction which couples two angular momenta, i.e. the angular momentum of a localized 4f system (J) and an orbital angular momentum generated in a cyclic π conjugated system by irradiation with a circularly-polarized light, has been identified in a lanthanide single molecule magnet.
May 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28534813/synthesis-and-characterization-of-dual-sensitive-fluorescent-nanogels-for-enhancing-drug-delivery-and-tracking-intracellular-drug-delivery
#10
Szu-Yuan Wu, Tilahun Ayane Debele, Yu-Chih Kao, Hsieh-Chih Tsai
Here, dual-sensitive fluorescent branched alginate-polyethyleneimine copolymer (bAPSC) nanogels were synthesized from thiolated alginate and stearoyl-derivatized branched polyethyleneimine. The formation of bAPSC conjugates was confirmed through proton nuclear magnetic resonance and Fourier transform infrared spectroscopy, whereas dynamic light scattering was used to measure the particle size and ζ potential of the nanogels. The fluorescent properties of the nanogels were confirmed through fluorescent spectroscopy and microscopy...
May 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28534679/laser-induced-photofragmentation-fluorescence-imaging-of-alkali-compounds-in-flames
#11
Tomas Leffler, Christian Brackmann, Marcus Aldén, Zhongshan Li
Laser-induced photofragmentation fluorescence has been investigated for the imaging of alkali compounds in premixed laminar methane-air flames. An ArF excimer laser, providing pulses of wavelength 193 nm, was used to photodissociate KCl, KOH, and NaCl molecules in the post-flame region and fluorescence from the excited atomic alkali fragment was detected. Fluorescence emission spectra showed distinct lines of the alkali atoms allowing for efficient background filtering. Temperature data from Rayleigh scattering measurements together with simulations of potassium chemistry presented in literature allowed for conclusions on the relative contributions of potassium species KOH and KCl to the detected signal...
June 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28534631/photochemical-formation-of-anthracene-quinone-methide-derivatives
#12
Djani Skalamera, Kata Mlinarić-Majerski, Irena Martin Kleiner, Marijeta Kralj, Jessy Oake, Peter Wan, Cornelia Bohne, Nikola Basaric
Anthrols 2-7 were synthesized and their photochemical reactivity investigated by irradiations in aq. CH3OH. Upon excitation with visible light (λ > 400 nm) in methanolic solutions they undergo photodehydration or photodeamination and deliver methyl ethers, most probably via quinone methides (QMs), with methanolysis quantum efficiencies ΦR = 0.02-0.3. Photophysical properties of 2-7 were determined by steady-state fluorescence and time-correlated single photon counting. Generally, anthrols 2-7 are highly fluorescent in aprotic solvents (ΦF = 0...
May 23, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28534587/light-induced-relaxation-dynamics-of-the-ferricyanide-ion-revisited-by-ultrafast-xuv-photoelectron-spectroscopy
#13
Nicholas Engel, Sergey I Bokarev, Alexandre Moguilevski, Azhr A Raheem, Ruba Al-Obaidi, Tobias Möhle, Gilbert Grell, Katrin R Siefermann, Bernd Abel, Saadullah G Aziz, Oliver Kühn, Mario Borgwardt, Igor Yu Kiyan, Emad F Aziz
Photoinduced charge transfer in transition-metal coordination complexes plays a prominent role in photosynthesis and is fundamental for light-harvesting processes in catalytic materials. However, revealing the relaxation pathways of charge separation remains a very challenging task because of the complexity of relaxation channels and ultrashort time scales. Here, we employ ultrafast XUV photoemission spectroscopy to monitor fine mechanistic details of the electron dynamics following optical ligand-to-metal charge-transfer excitation of ferricyanide in aqueous solution...
May 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28534489/long-term-mutual-phase-locking-of-picosecond-pulse-pairs-generated-by-a-semiconductor-nanowire-laser
#14
B Mayer, A Regler, S Sterzl, T Stettner, G Koblmüller, M Kaniber, B Lingnau, K Lüdge, J J Finley
The ability to generate phase-stabilized trains of ultrafast laser pulses by mode-locking underpins photonics research in fields, such as precision metrology and spectroscopy. However, the complexity of conventional mode-locked laser systems has hindered their realization at the nanoscale. Here we demonstrate that GaAs-AlGaAs nanowire lasers are capable of emitting pairs of phase-locked picosecond laser pulses with a repetition frequency up to 200 GHz when subject to incoherent pulsed optical excitation. By probing the two-pulse interference spectra, we show that pulse pairs remain mutually coherent over timescales extending to 30 ps, much longer than the emitted laser pulse duration (≤3 ps)...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28534474/influence-of-nanoscale-topology-on-bactericidal-efficiency-of-black-silicon-surfaces
#15
Denver P Linklater, Huu Khuong Duy Nguyen, Chris M Bhadra, Saulius Juodkazis, Elena P Ivanova
The nanostructuring of materials to create bactericidal and antibiofouling surfaces presents an exciting alternative to common methods of preventing bacterial adhesion. The fabrication of synthetic bactericidal surfaces has been inspired by the anti-wetting and anti-biofouling properties of insect wings, and other topologies found in nature. Black silicon is one such synthetic surfaces which has established bactericidal properties. In this study we show that time-dependent plasma etching of silicon wafers using 15, 30, and 45 min etching intervals, is able to produce different surface geometries with linearly increasing heights of approximately 280, 430, and 610 nm, respectively...
May 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28534406/relationships-between-exciton-dissociation-and-slow-recombination-within-znse-cds-and-cdse-cds-dot-in-rod-heterostructures
#16
Amanda N Grennell, James K Utterback, Orion M Pearce, Molly B Wilker, Gordana Dukovic
Type-II and quasi type-II heterostructure nanocrystals are known to exhibit extended excited-state lifetimes compared to their single material counterparts because of reduced wavefunction overlap between the electron and hole. However, due to fast and efficient hole trapping and non-uniform morphologies, the photophysics of dot-in-rod heterostructures are more rich and complex than this simple picture. Using transient absorption spectroscopy, we observe that the behavior of electrons in the CdS "rod" or "bulb" regions of non-uniform ZnSe/CdS and CdSe/CdS dot-in-rods is similar regardless of the "dot" material, which supports previous work demonstrating that hole trapping and particle morphology drive electron dynamics...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28534262/inflammatory-changes-in-paravertebral-sympathetic-ganglia-in-two-rat-pain-models
#17
Ai-Ling Li, Jing-Dong Zhang, Wenrui Xie, Judith A Strong, Jun-Ming Zhang
Injury to peripheral nerves can lead to neuropathic pain, along with well-studied effects on sensory neurons, including hyperexcitability, abnormal spontaneous activity, and neuroinflammation in the sensory ganglia. Neuropathic pain can be enhanced by sympathetic activity. Peripheral nerve injury may also damage sympathetic axons or expose them to an inflammatory environment. In this study, we examined the lumbar sympathetic ganglion responses to two rat pain models: ligation of the L5 spinal nerve, and local inflammation of the L5 dorsal root ganglion (DRG), which does not involve axotomy...
May 22, 2017: Neuroscience Bulletin
https://www.readbyqxmd.com/read/28533620/benefits-of-using-transcranial-magnetic-stimulation-as-a-tool-to-facilitate-the-chronic-knee-injury-rehabilitation
#18
Jae-Moo Lee, Ji-Hang Lee
[Purpose] While primary motor cortex activation has been implicated as a key factor in the arthrogenic muscle inhibition after knee joint injury, no viable rehabilitation protocol has been developed to accommodate this factor. In this study, transcranial magnetic stimulation was applied as a means of dissipating arthrogenic muscle inhibition by introducing temporary motor cortex excitation prior to the rehabilitation. [Subjects and Methods] Twenty-four subjects who have underwent the surgery due to knee injury were recruited, and randomly assigned to the control or the simulation groups...
April 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28533379/learned-response-sequences-in-cerebellar-purkinje-cells
#19
Dan-Anders Jirenhed, Anders Rasmussen, Fredrik Johansson, Germund Hesslow
Associative learning in the cerebellum has previously focused on single movements. In eyeblink conditioning, for instance, a subject learns to blink at the right time in response to a conditional stimulus (CS), such as a tone that is repeatedly followed by an unconditional corneal stimulus (US). During conditioning, the CS and US are transmitted by mossy/parallel fibers and climbing fibers to cerebellar Purkinje cells that acquire a precisely timed pause response that drives the overt blink response. The timing of this conditional Purkinje cell response is determined by the CS-US interval and is independent of temporal patterns in the input signal...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533267/the-kv1-associated-molecules-tag-1-and-caspr2-are-selectively-targeted-to-axon-initial-segment-in-hippocampal-neurons
#20
Delphine Pinatel, Bruno Hivert, Margaux Saint-Martin, Nelly Noraz, Maria Savvaki, Domna Karagogeos, Catherine Faivre-Sarrailh
Caspr2 and TAG-1 are cell adhesion molecules (CAMs) associated with the voltage-gated potassium channels Kv1.1/1.2 at regions controlling axonal excitability, the axon initial segment (AIS) and juxtaparanodes of myelinated axons. The distribution of Kv1 at juxtaparanodes requires axo-glial contacts mediated by Caspr2 and TAG-1. In the present study, we showed that TAG-1 strongly co-localizes with Kv1.2 at the AIS of cultured hippocampal neurons whereas Caspr2 is uniformly expressed along the axolemma. Live-cell imaging revealed that Caspr2 and TAG-1 are sorted together in axonal transport vesicles...
May 22, 2017: Journal of Cell Science
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