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https://www.readbyqxmd.com/read/28734871/the-role-of-temporal-contrast-and-blue-light-in-emmetropization
#1
Frances Rucker, Mark Henriksen, Tiffany Yanase, Christopher Taylor
A previous experiment showed that blue light (as a component of white light) protected against low temporal frequency dependent eye growth. This experiment investigated the role of temporal contrast. White leghorn chicks were exposed to white (with blue) or yellow (without blue) LED lighting modulated at either low (0.2 Hz) or high (10 Hz) temporal frequencies. Four cone contrast conditions were used: low (16%), medium (32%), medium-high (60%) and very-high (80%). Chicks were exposed to the lighting condition for 3 days (mean 680 lux)...
July 19, 2017: Vision Research
https://www.readbyqxmd.com/read/28734789/weathered-mc252-crude-oil-induced-anemia-and-abnormal-erythroid-morphology-in-double-crested-cormorants-phalacrocorax-auritus-with-light-microscopic-and-ultrastructural-description-of-heinz-bodies
#2
Kendal E Harr, Fred L Cunningham, Chris A Pritsos, Karen L Pritsos, Thivanka Muthumalage, Brian S Dorr, Katherine E Horak, Katie C Hanson-Dorr, Karen M Dean, Dave Cacela, Andrew K McFadden, Jane E Link, Katherine A Healy, Pete Tuttle, Steven J Bursian
Injury assessment of birds following the Deepwater Horizon (DWH) oil spill in 2010 was part of the Natural Resource Damage Assessment. One reported effect was hemolytic anemia with the presence of Heinz bodies (HB) in birds, however, the role of route and magnitude of exposure to oil is unknown. The purpose of the present study was to determine if double-crested cormorants (Phalacocorax auritis; DCCO) exposed orally and dermally to artificially weathered crude oil would develop hemolytic anemia including HB and reticulocytosis...
July 19, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28734286/communication-light-driven-remote-control-of-microgels-size-in-the-presence-of-photosensitive-surfactant-complete-phase-diagram
#3
Selina Schimka, Yulia D Gordievskaya, Nino Lomadze, Maren Lehmann, Regine von Klitzing, Artem M Rumyantsev, Elena Yu Kramarenko, Svetlana Santer
Here we report on a light triggered remote control of microgel size in the presence of photosensitive surfactant. The hydrophobic tail of the cationic surfactant contains azobenzene group that undergoes a reversible photo-isomerization reaction from a trans- to a cis-state accompanied by a change in the hydrophobicity of the surfactant. We have investigated light assisted behaviour and the complex formation of the microgels with azobenzene containing surfactant over the broad concentrational range starting far below and exceeding several times of the critical micelle concentration (CMC)...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28733412/schizosaccharomyces-japonicus-a-distinct-dimorphic-yeast-among-the-fission-yeasts
#4
Keita Aoki, Kanji Furuya, Hironori Niki
Genomic sequencing data and morphological properties demonstrate evolutionary relationships among groups of the fission yeast, Schizosaccharomyces Phylogenetically, S. japonicus is the furthest removed from other species of fission yeast. The basic characteristics of cell proliferation are shared among all fission yeast, including the process of binary fission during vegetative growth, conjugation and karyogamy with horsetail movement, mating-type switching, and sporulation. However, S. japonicus also exhibits characteristics that are unique to filamentous fungi...
July 21, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28733050/the-optical-imaging-of-an-idiopathic-paracentral-acute-middle-maculopathy-chinese-young-man-and-review-of-the-literatures
#5
REVIEW
Yanyan Chen, Yuedong Hu
We report a case of idiopathic paracentral acute middle maculopathy with typical optical imaging and clinical features. A 26-year-old Chinese policeman presented with a 20-day history of paracentral scotoma in the left eye after early wake-up and long-time working in front of computer the day before. He experienced sudden-onset strong flash in his left eye. Paracentral scotoma appeared in his left eye after 6hours of rest. The general history was negative. His best-corrected visual acuity was 20/20 OU. Anterior segment, dilated fundus examination, papillary evaluation and intraocular pressure were normal...
July 18, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28732968/simple-sonochemical-synthesis-of-ho2o3-sio2-nanocomposites-as-an-effective-photocatalyst-for-degradation-and-removal-of-organic-contaminant
#6
Sahar Zinatloo-Ajabshir, Sobhan Mortazavi-Derazkola, Masoud Salavati-Niasari
In this work, highly photocatalytically active Ho2O3-SiO2 nanocomposites have been designed and applied for decomposition of methylene blue pollutant. Ho2O3-SiO2 nanocomposites have been produced by new, quick and facile sonochemical process with the aid of tetramethylethylenediamine as a novel basic agent for the first time. The effect of the kind of basic agent, ultrasonic time and dosage of Ho source on the grain size, photocatalytic behavior and shape of the Ho2O3-SiO2 nanocomposites have been evaluated for optimization the production condition...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732160/color-encoded-assays-for-the-simultaneous-quantification-of-dual-cancer-biomarkers
#7
Jun Ma, Lei Zhan, Rong Sheng Li, Peng Fei Gao, Cheng Zhi Huang
For the first time, the scattering light of noble nanoparticles was applied for the simultaneous detection of dual cancer biomarkers. Two nanoprobes with dual scattering light colors were used for the simultaneous imaging of alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA) based on the sandwich-type immunoassay. Since AFP can combine anti-AFP-modified gold nanoparticles which have green scattering light under dark-field microscopic imaging (iDFM) technique while CEA can conjugate anti-CEA-immobilized silver nanoparticles which have blue scattering light, the simultaneous determination of AFP and CEA can be achieved by separately counting the number of green and blue light spots in iDFM technique...
July 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28732105/shining-a-light-on-the-arabidopsis-circadian-clock
#8
REVIEW
Rachael J Oakenfull, Seth J Davis
The circadian clock provides essential timing information to ensure optimal growth to prevailing external environmental conditions. A major time-setting mechanism (zeitgeber) in clock synchronisation is light. Differing light wavelengths, intensities and photoperiodic duration are processed for the clock-setting mechanism. Many studies on light-input pathways to the clock have focused on Arabidopsis thaliana. Photoreceptors are specific chromic proteins that detect light signals and transmit this information to the central circadian oscillator through a number of different signalling mechanisms...
July 21, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28731337/sky-blue-emitting-dendritic-alkynylgold-iii-complexes-for-solution-processable-organic-light-emitting-devices
#9
Chin-Ho Lee, Man-Chung Tang, Yi-Chun Wong, Mei-Yee Chan, Vivian Wing-Wah Yam
A new class of tridentate ligand-containing cyclometalated gold(III) complexes featuring dendritic alkynyl ligands with carbazole moieties as dendrons and peripheral groups has been synthesized up to the third generation. High-performance solution-processable organic light-emitting devices (OLEDs) with maximum current efficiency of up to 23.7 cd A(-1) and external quantum efficiency of up to 6.9% have been realized by a simple spin-coating technique. With the incorporation of bulky carbazole moieties to form higher generation dendrimers, the undesirable excimeric emission could be effectively reduced, allowing the fine-tuning of the emission color toward the blue region...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28731071/-potential-impact-of-colors-of-filters-used-in-sunglasses-on-the-melatonin-suppression-process
#10
Grzegorz Owczarek, Grzegorz Gralewicz, Agnieszka Wolska, Natalia Skuza, Piotr Jurowski
BACKGROUND: In this article the methods for determining spectral transmittance of optical radiation in the visible waveband range through selected materials used as optical filters against solar glare were described. MATERIAL AND METHODS: Transmittance coefficients specified for the fraction of light passing through tested filters, taking into account the mechanism of eye adaptation to daylight and night vision and the melatonin suppression process were compared for 4 dyed sunglass filters...
July 10, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28730816/multi-functional-octamethyltetrasila-2-2-cyclophanes-conformational-variations-circularly-polarized-luminescence-and-organic-electroluminescence
#11
Masaki Shimada, Yoshinori Yamanoi, Tatsuhiko Ohto, Song-Toan Pham, Ryo Yamada, Hirokazu Tada, Kenichiro Omoto, Shohei Tashiro, Mitsuhiko Shionoya, Mineyuki Hattori, Keiko Jimura, Shigenobu Hayashi, Hikaru Koike, Munetaka Iwamura, Koichi Nozaki, Hiroshi Nishihara
Both symmetrical and unsymmetrical cyclophanes containing disilane units, tetrasila[2.2]cyclophanes 1-9, were synthesized. The syn and anti conformation and the kinetics of inversion between two anti-isomers were investigated by X-ray diffraction and variable-temperature NMR analysis, respectively. The flipping motion of two aromatic rings was affected by the bulkiness of the aromatic moiety (1 vs 6), the phase (solid vs solution), and the inclusion by host molecules (1 vs 1⊂[Ag2L](2)(+)). The photophysical, electrochemical, and structural properties of the compounds were thoroughly investigated...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28729912/protection-of-the-biconcave-profile-of-human-erythrocytes-against-osmotic-damage-by-ultraviolet-a-irradiation-through-membrane-cytoskeleton-enhancement
#12
Cunbo Li, Zheming Li, Shuang Xun, Pengchong Jiang, Rui Yan, Mincai Chen, Fen Hu, Romano A Rupp, Xinzheng Zhang, Leiting Pan, Jingjun Xu
To perform various physiological functions, erythrocytes possess a unique biconcave shape provided by a special architecture of the membrane-skeleton system. In the present work, we use a simple irradiation method to treat human erythrocytes with 365 nm ultraviolet-A (UVA) light at the single-cell level in vitro. Depending on the irradiation dose, UVA show protection of the biconcave profile against the detrimental action of distilled water. This protective effect can also be confirmed for saponin that damages the membrane-skeleton by vesiculation and pore formation...
2017: Cell Death Discovery
https://www.readbyqxmd.com/read/28729789/in-vitro-evaluation-of-microleakage-under-orthodontic-brackets-bonded-with-different-adhesive-systems
#13
Ramin Atash, Ali Fneiche, Sibel Cetik, Babak Bahrami, Alain Balon-Perin, Maria Orellana, Régine Glineur
OBJECTIVE: Adhesives systems have a drawback when utilized for bonding orthodontic brackets: they shrink during photopolymerization creating microleakage. The aim of this study was to assess the stability of different orthodontic adhesives around brackets and enamel. MATERIALS AND METHODS: Sixty noncarious mandibular premolars extracted for orthodontic reasons were randomly divided into six groups of adhesives used for bonding brackets to dental enamel: NeoBond(®) Light Cure Adhesive Kit, Transbond™ Plus Self-Etching, Victory V-Slot APC PLUS(®) + Transbond™ MIP, Rely-A-Bond(®) Kit, Light Cure Orthodontic Adhesive Kit (OptiBond(®)), and Transbond™ MIP...
April 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28729530/achieving-ultrahigh-triboelectric-charge-density-for-efficient-energy-harvesting
#14
Jie Wang, Changsheng Wu, Yejing Dai, Zhihao Zhao, Aurelia Wang, Tiejun Zhang, Zhong Lin Wang
With its light weight, low cost and high efficiency even at low operation frequency, the triboelectric nanogenerator is considered a potential solution for self-powered sensor networks and large-scale renewable blue energy. As an energy harvester, its output power density and efficiency are dictated by the triboelectric charge density. Here we report a method for increasing the triboelectric charge density by coupling surface polarization from triboelectrification and hysteretic dielectric polarization from ferroelectric material in vacuum (P ~ 10(-6) torr)...
July 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28728913/considerations-in-repetitive-activation-of-light-sensitive-ion-channels-for-long-term-studies-channel-rhodopsin-in-the-drosophila-model
#15
Jake Higgins, Christina Hermanns, Cole Malloy, Robin L Cooper
Optogenetics is a technique used in various animal models and holds a potential for therapeutic possibilities in mammals. There are technical issues with the use of light sensitive ion channels: reproducible effects over time, controlling where the non-native proteins are targeted within the cell and changes in the biophysical properties of the cells they are expressed in. We used a variant of channel rhodopsin (ChR2-XXL) and targeted expression in neurons of larval Drosophila to investigate the acute and chronic activation, with light pulses, of the channels on synaptic function...
July 17, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28728538/effects-of-cataract-opacity-and-surgery-on-sleep-quality
#16
Aya Kokune, Masahiko Ayaki, Kazuo Tsubota, Kazuno Negishi
BACKGROUND: This study aimed to identify the type of cataract opacity associated with subjective sleep quality for cataract patients. METHODS: A total of 180 consecutive patients (average age 74.2 years) underwent cataract surgery with implantation of a UV-blocking or blue light-blocking intra ocular lens. The participants' subjective sleep quality was evaluated using the Pittsburgh sleep quality index (PSQI) before and at 2 months after surgery. Patients were divided into two groups for analysis: normal sleepers (preoperative PSQI ≤ 5) and poor sleepers (preoperative PSQI ≥ 6)...
July 20, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28728111/a-heteropoly-blue-as-environmental-friendly-material-an-excellent-heterogeneous-fenton-like-catalyst-and-flocculent
#17
Bao-Li Fei, Ni-Ping Deng, Jiang-Hong Wang, Qing-Bo Liu, Jian-Ying Long, Yang-Guang Li, Xiang Mei
The first 3D heteropoly blue Ba2Na4[SiW4(V)W8(VI)O40]·19H2O (1) as heterogeneous Fenton-like catalyst and flocculent was hydrothermally synthesized and fully characterized by various methods 1 was an efficient Fenton-like catalyst for degradation of phenol with degradation rate of 92.1% (visible light irradiation), and 89.0% (no light) in 90min, respectively. The degradation efficiency of anionic dye methyl orange was 97.0% in 5min, when 1 was used as photo-Fenton-like catalyst under visible light. And 1 was a nice flocculent for cationic dyes methylene blue and rhodamine B, the removal rates were both above 95%...
July 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28726908/mn-4-li-co-doped-srmgal10o17-phosphor-in-glass-application-in-high-power-warm-w-leds
#18
Jiasong Zhong, Wei Xu, Qingli Chen, Shuo Yuan, Zhengguo Ji, Daqin Chen
Currently, the shortage of red components and easy aging of organic silicone still remain challenges for high-power phosphor-converted warm white light-emitting diodes (w-LEDs). Aiming to alleviate these issues, phosphor-in-glass (PiG), fabricated by co-sintering red- and yellow-emitting phosphors and low-melting glass, has been regarded as a promising color converter for w-LEDs. In this study, a Li(+),Mn(4+) co-doped SrMgAl10O17 red phosphor was synthesized via a conventional solid-state reaction. The as-prepared phosphor exhibits a deep red emission, ascribed to Mn(4+):(2)Eg → (4)A2g spin-forbidden transition in the range of 600-700 nm with a narrow-band full width at half maximum of 55 nm, and provides an ideal broadband excitation extending from 250 to 530 nm...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28726875/time-resolved-spectroscopic-analysis-of-the-light-energy-harvesting-mechanism-in-carbazole-dendrimers-with-a-blue-phosphorescent-ir-complex-core
#19
Yang-Jin Cho, So-Yoen Kim, Mi Rang Son, Ho-Jin Son, Dae Won Cho, Sang Ook Kang
In order to investigate the light-energy harvesting mechanism, a series of dendrimers with a heteroleptic iridium(iii) complex core, [Ir(dmb)2(pic-Czn)] (Gn: n = 1, 2, and 3), with 2,6-difluoro-3-(4-methylpyridin-2-yl)benzonitrile (dmb) as the cyclometallating ligand and 3-hydroxypicolinate (pic) as the ancillary ligand, connected to carbazole-based dendrons (Czn: n = 2, 4, and 8) was synthesized. The Ir centred complex [Ir(dmb)2(pic-OCH3), G0] shows a blue emission at <500 nm, which is assigned to metal-to-ligand charge-transfer ((3)MLCT) phosphorescence...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726671/in-situ-decoration-of-plasmonic-au-nanoparticles-on-graphene-quantum-dots-graphitic-carbon-nitride-hybrid-and-evaluation-of-its-visible-light-photocatalytic-performance
#20
Biswajit Choudhury, Pravat Kumar Giri, Rajender Gone
This work spotlights the development of a plasmonic photocatalyst showing surface plasmon induced enhanced visible light photocatalytic performance. Plasmonic Au nanoparticles (NPs) are decorated over the hybrid nanosystem of graphitic carbon nitride (GCN) and graphene quantum dots (GQD) by citrate reduction method. Surface plasmon resonance (SPR) induced enhancement of Raman G and 2D band intensity is encountered on excitation of the Plasmonic hybrid at 514.5 nm, which is near to the 532 nm absorption band of Au nanoparticles...
July 20, 2017: Nanotechnology
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