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Pulsed light OR IPL

Fei Tong, Maram Al-Haidar, Lingyan Zhu, Rabih O Al-Kaysi, Christopher J Bardeen
Block-like microcrystals composed of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate are grown from aqueous surfactant solutions. A pulse of 405 nm light converts a fraction of molecules to the trans isomer, creating an amorphous mixed layer that peels off the parent crystal. This photoinduced delamination can be repeated multiple times on the same block.
February 18, 2019: Chemical Communications: Chem Comm
Xiangjun Pu, Huiming Wang, Dong Zhao, Hanxi Yang, Xinping Ai, Shunan Cao, Zhongxue Chen, Yuliang Cao
The increasing demands for renewable energy to substitute traditional fossil fuels and related large-scale energy storage systems (EES) drive developments in battery technology and applications today. The lithium-ion battery (LIB), the trendsetter of rechargeable batteries, has dominated the market for portable electronics and electric vehicles and is seeking a participant opportunity in the grid-scale battery market. However, there has been a growing concern regarding the cost and resource availability of lithium...
February 18, 2019: Small
Mamoru Nagano, Keisuke Ikegami, Yoichi Minami, Yuji Kanazawa, Satoshi Koinuma, Mitsugu Sujino, Yasufumi Shigeyoshi
The suprachiasmatic nucleus (SCN) is the center of the mammalian circadian system. Environmental photic signals shifts the phase of the circadian rhythm in the SCN except during the dead zone, when the photic signal is gated somewhere on the way from the retina to the neurons in the SCN. Here we examined the phase of the dead zone after an abrupt delay of the LD cycles for several days by observing the mc-Fos induction in the SCN by light pulses. After an abrupt shift of the LD cycles, the dead zone showed a slow phase shift, about two hours per day, which was well corresponded with the slow phase shift of the rest-activity cycles...
February 13, 2019: Brain Research
D Schmidt, B Berger, M Kahlert, M Bayer, C Schneider, S Höfling, E S Sedov, A V Kavokin, M Aßmann
Dark excitons are of fundamental importance for a wide variety of processes in semiconductors but are difficult to investigate using optical techniques due to their weak interaction with light fields. We reveal and characterize dark excitons nonresonantly injected into a semiconductor microcavity structure containing InGaAs/GaAs quantum wells by a gated train of eight 100 fs pulses separated by 13 ns by monitoring their interactions with the bright lower polariton mode. We find a surprisingly long dark exciton lifetime of more than 20 ns, which is longer than the time delay between two consecutive pulses...
February 1, 2019: Physical Review Letters
B Barrett, P Cheiney, B Battelier, F Napolitano, P Bouyer
We propose new multidimensional atom optics that can create coherent superpositions of atomic wave packets along three spatial directions. These tools can be used to generate light-pulse atom interferometers that are simultaneously sensitive to the three components of acceleration and rotation, and we discuss how to isolate these inertial components in a single experimental shot. We also present a new type of atomic gyroscope that is insensitive to parasitic accelerations and initial velocities. The ability to measure the full acceleration and rotation vectors with a compact, high-precision, low-bias inertial sensor could strongly impact the fields of inertial navigation, gravity gradiometry, and gyroscopy...
February 1, 2019: Physical Review Letters
Alice Dal Fovo, George J Tserevelakis, Athanasia Papanikolaou, Giannis Zacharakis, Raffaella Fontana
In this Letter, we present a combined photoacoustic imaging method, based on consecutive excitation using either the fundamental or the second-harmonic wavelength of a pulsed Nd:YAG laser for the stratigraphy of painted artworks. Near-infrared excitation was employed for the imaging of hidden underdrawings in mock-up samples, whereas visible light was used for the thickness mapping of the overlying paint through the detection of photoacoustic signal attenuation. The proposed methodology was proven effective in measuring thick and strongly absorbing layers, which would not be possible by means of other pure optical techniques, while also enabling the visualization of features underneath the painted surface...
February 15, 2019: Optics Letters
Wei Gao, Hiroki Ota, Daisuke Kiriya, Kuniharu Takei, Ali Javey
Wearable sensors play a crucial role in realizing personalized medicine, as they can continuously collect data from the human body to capture meaningful health status changes in time for preventive intervention. However, motion artifacts and mechanical mismatches between conventional rigid electronic materials and soft skin often lead to substantial sensor errors during epidermal measurement. Because of its unique properties such as high flexibility and conformability, flexible electronics enables a natural interaction between electronics and the human body...
February 15, 2019: Accounts of Chemical Research
Thiago C Moulin, Lyvia L Petiz, Danielle Rayêe, Jessica Winne, Roberto G Maia, Rafael V Lima da Cruz, Olavo B Amaral, Richardson N Leão
Prolonged increases in excitation can trigger cell-wide homeostatic responses in neurons, altering membrane channels, promoting morphological changes, and ultimately reducing synaptic weights. However, how synaptic downscaling interacts with classical forms of Hebbian plasticity is still unclear. In this study, we investigated whether chronic optogenetic stimulation of hippocampus CA1 pyramidal neurons in freely moving mice could (a) cause morphological changes reminiscent of homeostatic scaling, (b) modulate synaptic currents that might compensate for chronic excitation, and (c) lead to alterations in Hebbian plasticity...
February 15, 2019: Hippocampus
A Adamow, L Sznitko, E Chrzumnicka, J Stachera, A Szukalski, T Martynski, J Mysliwiec
One of the most important drawback of organic dyes is their low photo-stability which reduces possibility of their commercial utilization. In this article we employ the strategy of dye re-crystallization from oversaturated matrix in order to enhance material's durability. One of the main advantages of perylene derivative is ability to form emissive j-aggregates, good miscibility and incorporation into liquid crystalline matrix. Investigation of perylene-based dye and LC matrix brought as the result very efficient light amplification modulation by applied external electric field...
February 14, 2019: Scientific Reports
Muhammad Arshad Kamran
Tunable single-mode lasers are attractive for their potential applications in signal processing, optical communication, and displays. Here we present the Mn(II) ions assisted single-mode lasing occurring at near-infrared (NIR) band instead of the green emission band of CdS nanobelts (NBs) for the first time. Successful substation of Mn(II) ions at the tetrahedral Cd2+ cites in the CdS matrix were confirmed by EPR. Light Mn(II) doping (≤1%) in CdS belts not only red-shifted the Raman modes but also increased crystallinity compared to pure CdS NBs due to strong excitons-phonon couplings...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Xiaoli Li, Yunfei Hao, Rong Xue, Xueting Qi, Zhigang Ma
RATIONALE: Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) and anti-glomerular basement membrane (GBM) antibody disease are both rare autoimmune diseases. Monoclonal gammopathy of undetermined significance (MGUS) is one of the most common causes of plasma cell dyscrasias (PCD). The three entities can cause renal lesions via different mechanisms and, however, they have not been reported in a single patient with renal lesion. PATIENT CONCERNS: Here, we describe a patient with half-year fatigue and 40-day nausea and vomiting...
February 2019: Medicine (Baltimore)
Susan P Krumdieck, Raphaël Boichot, Rukmini Gorthy, Johann G Land, Sabine Lay, Aleksandra J Gardecka, Matthew I J Polson, Alibe Wasa, Jack E Aitken, Jack A Heinemann, Gilles Renou, Grégory Berthomé, Frédéric Charlot, Thierry Encinas, Muriel Braccini, Catherine M Bishop
TiO2 photocatalyst is of interest for antimicrobial coatings on hospital touch-surfaces. Recent research has focused on visible spectrum enhancement of photocatalytic activity. Here, we report TiO2 with a high degree of nanostructure, deposited on stainless steel as a solid layer more than 10 μm thick by pulsed-pressure-MOCVD. The TiO2 coating exhibits a rarely-reported microstructure comprising anatase and rutile in a composite with amorphous carbon. Columnar anatase single crystals are segmented into 15-20 nm thick plates, resulting in a mille-feuilles nanostructure...
February 13, 2019: Scientific Reports
Ines Verner, Hadas Prag Naveh, Dario Bertossi
An increasing number of minimally invasive cosmetic procedures, such as filler or botulinum toxin injections, are performed annually. These procedures are associated with a high risk of post-procedure bruising or ecchymosis. Ecchymoses arise following hemorrhage and extravasation of red blood cells into the subcutaneous tissue, leading to local skin discoloration. Although ecchymoses generally resolve within 14 days, their appearance is cosmetically bothersome, and they may be painful and cause major distress to patients...
February 13, 2019: Dermatologic Therapy
Melissa M Toyos
No abstract text is available yet for this article.
February 6, 2019: Cornea
João Jorge, Charlotte Bouloc, Lucie Bréchet, Christoph M Michel, Rolf Gruetter
Electroencephalography (EEG) recordings performed in magnetic resonance imaging (MRI) scanners are affected by complex artifacts caused by heart function, often termed pulse artifacts (PAs). PAs can strongly compromise EEG data quality, and remain an open problem for EEG-fMRI. This study investigated the properties and mechanisms of PA variability across heartbeats, which has remained largely unaddressed to date, and evaluated its impact on PA correction approaches. Simultaneous EEG-fMRI was performed at 7T on healthy participants at rest or under visual stimulation, with concurrent recordings of breathing and cardiac activity...
February 8, 2019: NeuroImage
Takashige Fujiwara, Tohru Kobayashi, Katsumi Midorikawa
We achieve a considerable improvement in proposed schemes for the selective photoionization of odd mass zirconium isotopes. The technique implements intermediate-state alignment for isotope-selective laser excitation by broadband pulsed lasers, which incorporates the spectroscopic selection rules for the absorption of polarized light. The improvement includes newly found intermediate levels, where J = 0 character as a third excited-state intermediate, in cooperation with four-step photoexcitation (J = 2-1-1-0 scheme)...
February 11, 2019: Scientific Reports
A A Serkov, H V Snelling, S Heusing, T Martins Amaral
Tin doped indium oxide (ITO) thin films provide excellent transparency and conductivity for electrodes in displays and photovoltaic systems. Current advances in producing printable ITO inks are reducing the volume of wasted indium during thin film patterning. However, their applicability to flexible electronics is hindered by the need for high temperature processing that results in damage to conventional polymer substrates. Here, we detail the conditions under which laser heating can be used as a replacement for oven and furnace treatments...
February 11, 2019: Scientific Reports
Meng Jin, Xiuna Ji, Baoyue Zhang, Wenlong Sheng, Rongchun Wang, Kechun Liu
Pollutant discharges to the aquatic environment often contain multiple environmental stressors, affecting aquatic organisms. To mimic the discharges from nuclear and industry facilities, the combined effects of two independent types of stressors, heavy metal Pb and repeated heat pulse were addressed in this study. We investigated the developmental toxicity of combined treatment, especially its toxic effects on zebrafish neurodevelopment. The normal embryos at 4 hpf were exposed to 0.2 mM of Pb dissolved in the bathing medium with different temperatures (30, 32, and 34 °C) and then maintained in an incubator at 28 °C...
February 5, 2019: Ecotoxicology and Environmental Safety
Michael Chang, Suzie Dufour, Peter L Carlen, Taufik A Valiante
Controlling seizures remains a challenging issue for the medical community. To make progress, researchers need a way to extensively study seizure dynamics and investigate its underlying mechanisms. Acute seizure models are convenient, offer the ability to perform electrophysiological recordings, and can generate a large volume of electrographic seizure-like (ictal) events. The promising findings from acute seizure models can then be advanced to chronic epilepsy models and clinical trials. Thus, studying seizures in acute models that faithfully replicate the electrographic and dynamical signatures of a clinical seizure will be essential for making clinically relevant findings...
January 19, 2019: Journal of Visualized Experiments: JoVE
Erin Morgan, Dominik Wupperfeld, Demosthenes P Morales, Norbert O Reich
Plasmon-resonant nanoparticles provide unprecedented spatio-temporal control over the release of diverse cargoes into cells. Here we compare the loading, release and internalization efficiencies, and effectiveness of post transcriptional gene silencing of hollow gold nanoshells, hollow gold nanocages, and gold nanorods with plasmons tuned to absorb near-infrared light at 800 nm. The hollow gold nanoshells can be loaded with up to three times more siRNA cargo compared to nanocages and nanorods; however, nanorods exhibit the highest efficiency of release of attached siRNA strands when exposed to pulsed 800 nm laser excitation...
February 8, 2019: Bioconjugate Chemistry
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