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Blue light

Doekele G Stavenga, Hein L Leertouwer, Andrej Meglič, Kazimir Drašlar, Martin F Wehling, Primož Pirih, Gregor Belušič
The palm borer moth Paysandisia archon (Castniidae; giant butterfly-moths) has brown dorsal forewings and strikingly orange-coloured dorsal hindwings with white spots surrounded by black margins. Here, we have studied the structure and pigments of the wing scales in the various coloured wing areas, applying light and electron microscopy and (micro)spectrophotometry, and we analysed the spatial reflection properties with imaging scatterometry. The scales in the white spots are unpigmented, those in the black and brown wing areas contain various amounts of melanin, and the orange wing scales contain a blue-absorbing ommochrome pigment...
2018: PeerJ
Sabyasachi Pramanik, Satyapriya Bhandari, Uday Narayan Pan, Shilaj Roy, Arun Chattopadhyay
The interaction of the neurotransmitter dopamine is reported with a single particle white light-emitting (WLE) quantum dot complex (QDC). The QDC is composed of yellow emitting ZnO quantum dots (Qdots) and blue emitting Zn(MSA)2 complex (MSA = N-methylsalicylaldimine) synthesized on their surfaces. Sensing is achieved by the combined changes in the visual luminescence color from white to blue, chromaticity color coordinates from (0.31, 0.33) to (0.24, 0.23) and the ratio of the exponents (αon /αoff ) of on/off probability distribution (from 0...
April 17, 2018: Small
Charles Mignon, Natallia E Uzunbajakava, Irene Castellano-Pellicena, Natalia V Botchkareva, Desmond J Tobin
BACKGROUND OBJECTIVES: The past decade has witnessed a rapid expansion of photobiomodulation (PBM), demonstrating encouraging results for the treatment of cutaneous disorders. Confidence in this approach, however, is impaired not only by a lack of understanding of the light-triggered molecular cascades but also by the significant inconsistency in published experimental outcomes, design of the studies and applied optical parameters. This study aimed at characterizing the response of human dermal fibroblast subpopulations to visible and near-infrared (NIR) light in an attempt to identify the optical treatment parameters with high potential to address deficits in aging skin and non-healing chronic wounds...
April 17, 2018: Lasers in Surgery and Medicine
Cong You, Fang Xia, Yue Zhao, Yin Zhang, Yongjian Sheng, Yipei Wu, Xiao-Chun Hang, Fei Chen, Huili Ma, Kang Shen, Zhengyi Sun, Takahiro Ueba, Satoshi Kera, Cong Zhang, Hong-Hai Zhang, Zhi-Kuan Chen, Wei Huang
The structural and photophysical properties of well-selected tetradentate Pt(II) frames including Pt(ppzOppz), Pt(ppzOpopy), Pt(ppzOczpy) and Pt(czpyOczpy) have been experimentally and theoretically explored in detail. Single crystal diffraction measurements of the four complexes provided accurate bond lengths, angles and other integrate structural information. Their characteristic electrochemical and photophysical information clearly revealed internal electronic levels in ground and excited states. Time dependent density functional theory (TD-DFT) uncovered electron distributions in transition process of excitation (S0→S1) and radiation (S1→T1→S0)...
April 17, 2018: Journal of Physical Chemistry Letters
Hasan Raboui, Alan J Lough, Anjuli M Szawiola, Timothy P Bender
Tetrabenzotriazacorroles (Tbcs) are a family of molecules related to phthalocyanines but have the unique ability to intensely absorb both blue and red light. Here, we report the synthesis of four novel silicon tetrabenzotriazacorrole derivatives (SiTbcs) with varying sized axial ligands. SiTbcs are formed starting from bis(hydroxy) silicon phthalocyanine ((OH)2 -SiPc) via a simple in situ axial functionalization and reductive chemical process using magnesium metal and the respective chlorosilane in pyridine...
April 17, 2018: Inorganic Chemistry
Rareş Căpitan, Carlo Schievano, Chiara Noli
BACKGROUND: Direct examination of the hair is a simple diagnostic test for the diagnosis of dermatophytosis; training is needed to use this test. HYPOTHESIS/OBJECTIVES: To evaluate whether use of modified Wright-Giemsa blue stain and/or photographic images of infected and uninfected hairs improved the user's ability to identify infected or uninfected hairs. ANIMALS: Ten cats with, and 10 cats without, dermatophytosis due to Microsporum canis (n = 20)...
April 17, 2018: Veterinary Dermatology
Biao Yuan, Shanyue Guan, Xingming Sun, Xiaoming Li, Haibo Zeng, Zheng Xie, Ping Chen, Shuyun Zhou
Carbon dots (CDs) have potentials to be utilized in optoelectronic devices, bioimaging and photocatalysis. The majority of the current CDs with high quantum yield to date were limited in the blue light emission region. Herein, based on the surface electron state engineering, we report a kind of CDs with reversibly switching ability between green and red photoluminescence with quantum yield both up to 80%. Highly efficient green and red solid state luminescence are realized by doping CDs into highly transparent matrix methyltriethoxysilane and 3-Triethoxysilylpropylamine to form CDs/gel-glasses composites with quantum yield of 80% and 78%...
April 17, 2018: ACS Applied Materials & Interfaces
Aneta Slodek, Anna Maroń, Michał Pająk, Marek Matussek, Iwona Grudzka-Flak, Jan Grzegorz Małecki, Anna Świtlicka, Stanisław Krompiec, Witold Danikiewicz, Małgorzata Grela, Izabela Gryca, Mateusz Penkala
Six novel fluoranthene derivatives, three terminally substituted and three bis(fluoranthenes) with fluorene, bithiophene and carbazole spacers were obtained via [2+2+2] cycloaddition and thoroughly characterized. Based on the conducted studies, the obtained derivatives can be classified as D-A (donor-acceptor) and A-D-A (acceptor-donor-acceptor) systems, where fluoranthene unit acts as an electron-withdrawing unit. The optical results revealed that novel fluoranthene derivatives absorb light in the range of 236-417 nm originating from ππ* transition within the conjugated system...
April 16, 2018: Chemistry: a European Journal
Kayla Marra, Ethan P LaRochelle, M Shane Chapman, P Jack Hoopes, Karina Lukovits, Edward V Maytin, Tayyaba Hasan, Brian W Pogue
Daylight-mediated photodynamic therapy (d-PDT) as a treatment for actinic keratosis (AK) is an increasingly common technique due to a significant reduction in pain, leading to better patient tolerability. While past studies have looked at different light sources and delivery methods, this study strives to provide equivalent PpIX-weighted light doses with the hypothesis that artificial light sources could be equally as effective as natural sunlight if their PpIX-weighted fluences were equalized. Normal mouse skin was used as the model to compare blue LED light, metal halide white light, and natural sunlight, with minimal incubation time between topical ALA application and the onset of light delivery...
April 16, 2018: Photochemistry and Photobiology
Tao Peng, Jian Zhang, Srimanta Ray, Houssam Fakhouri, Xu Xu, Farzaneh Arefi-Khonsari, Jerald A Lalman
Enhanced TiO2 nanorods (TNRs) with partially reduced graphene oxide (RGO) (designated as GT) were prepared for degrading aqueous hazardous pollutants. The degree of RGO oxidation had an important role in affecting the photoelectronic and photocatalytic activities of GT composites. The study examined the impact of the degree of RGO oxidation on the photocatalytic activities. The photocatalytic activity of the materials was investigated for degrading rhodamine b (RhB), methyl orange (MO), methylene blue (MB), and phenol by using ultraviolet (UV) light...
April 16, 2018: Environmental Science and Pollution Research International
R Perkins, C Williamson, J Lavaud, J-L Mouget, D A Campbell
Photoacclimation by strains of Haslea "blue" diatom species H. ostrearia and H. silbo sp. nov. ined. was investigated with rapid light curves and induction-recovery curves using fast repetition rate fluorescence. Cultures were grown to exponential phase under 50 µmol m-2  s-1 photosynthetic available radiation (PAR) and then exposed to non-sequential rapid light curves where, once electron transport rate (ETR) had reached saturation, light intensity was decreased and then further increased prior to returning to near growth light intensity...
April 16, 2018: Photosynthesis Research
Wen-Cheng Chen, Yi Yuan, Ze-Lin Zhu, Shao-Fei Ni, Zuo-Quan Jiang, Liang-Sheng Liao, Fu-Lung Wong, Chun-Sing Lee
A novel host material featuring a spiro-annulated benzimidazole configuration is exploited for blue phosphorescent organic light-emitting devices (PhOLEDs). The new material exhibits a high triplet energy (3.07 eV) and a bipolar characteristic and is effective as the host for FIrpic-, FIr6- and FK306-based blue PhOLEDs with high performances.
April 17, 2018: Chemical Communications: Chem Comm
Hui-Juan Li, Peng-Yun Li, Li-Ying Li, Abdul Haleem, Wei-Dong He
Narrowly distributed poly(l-lysine- b - N -isopropylacrylamide) (PLL- b -PNIPAM) was prepared through ring-opening polymerization of ε-benzyloxycarbonyl-l-lysine N -carboxy-α-amino anhydride and atom transfer radical polymerization of NIPAM, followed with the removal of ε-benzyloxycarbonyl group. Then gold nanoparticles (AuNPs) grafted with PLL- b -PNIPAM (PNIPAM-PLL-AuNPs) were obtained by the reduction of chloroauric acid with sodium citrate in the presence of PLL- b -PNIPAM...
April 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Shihao Chen, Yang Xiao, Yinhai Wang, Zhengfa Hu, Hui Zhao, Wei Xie
Black TiO₂ has triggered worldwide research interest due to its excellent photocatalytic properties. However, the understanding of its structure–property relationships and a more effective, facile and versatile method to produce it remain great challenges. We have developed a facile approach to synthesize black TiO₂ nanoparticles with significantly improved light absorption in the visible and infrared regions. The experimental results show that oxygen vacancies are the major factors responsible for black coloration...
April 16, 2018: Nanomaterials
Mohammad Ali Shahtalebi, Gholam Reza Asghari, Farideh Rahmani, Fatemeh Shafiee, Ali Jahanian-Najafabadi
Background: Antirrhinum majus contains aurone with excellent antibacterial and antifungal activities. In addition, visible light activates the endogenous porphyrins of Propionibacterium acne , which results in bacterial death. Therefore, considering the above-mentioned facts, the aim of the present study was to prepare a topical herbal gel of A. majus hydroalcoholic extract and to evaluate its antiacne effects with or without blue light combination as an activator of the porphyrins. Materials and Methods: Antibacterial activity of the shoot or petal extracts was evaluated by disc diffusion method and the minimum inhibitory concentration (MIC) was calculated...
2018: Advanced Biomedical Research
M P J Aarts, A L P Rosemann
BACKGROUND: For treating affective disorders like SAD, light therapy is used although the underlying mechanism explaining this success remains unclear. To accelerate the research on defining the light characteristics responsible for inducing a specific effect a uniform manner for specifying the irradiance at the eye should be defined. This allows a genuine comparison between light-affect studies. An important factor impacting the irradiance at the eye are the radiant characteristics of the used light therapy device...
April 5, 2018: Journal of Affective Disorders
David Hanigan, Lisa Truong, Jared Schoepf, Takayuki Nosaka, Anjali Mulchandani, Robert L Tanguay, Paul Westerhoff
Both nanoparticulate (nZnO and nTiO2 ) and organic chemical ultraviolet (UV) filters are active ingredients in sunscreen and protect against skin cancer, but limited research exists on the environmental effects of sunscreen release into aquatic systems. To examine the trade-offs of incorporating nanoparticles (NPs) into sunscreens over the past two decades, we targeted endpoints sensitive to the potential risks of different UV filters: solar reactive oxygen production in water and disruption of zebrafish embryo development...
March 27, 2018: Water Research
Junzhe Dong, Junzhi Ye, Dessy Ariyanti, Yixuan Wang, Shanghai Wei, Wei Gao
The modification of titanium dioxide (TiO2 ) using noble metal nanoparticles is considered as a promising technique to make electrode with outstanding photocatalytic performance. In this paper, self-organized anodic TiO2 nanotube arrays were decorated with well-distributed small Cu nanoparticles through a novel technique that combines magnetron sputtering and thermal dewetting. The obtained nanocomposite catalyst exhibited 4-fold increase in the photodegradation rate of methylene blue aqueous solution under solar light irradiation than anatase TiO2 prepared with same anodization conditions...
April 9, 2018: Chemosphere
Christoph Witzel, Karl R Gegenfurtner
This study investigated categorical perception for unique hues in order to establish a relationship between color appearance, color discrimination, and low-level (second-stage) mechanisms. We tested whether pure red, yellow, green, and blue (unique hues) coincide with troughs, and their transitions (binary hues) with peaks of sensitivity in DKL-space. Results partially confirmed this idea: JNDs demarcated perceptual categories at the binary hues around green, blue and less clearly around yellow, when colors were isoluminant with the background and when accounting for the overall variation of sensitivity by fitting an ellipse...
April 10, 2018: Vision Research
Olena S Iadlovska, Graham R Maxwell, Greta Babakhanova, Georg H Mehl, Christopher Welch, Sergij V Shiyanovskii, Oleg D Lavrentovich
Selective reflection of light by oblique helicoidal cholesteric (ChOH ) can be tuned in a very broad spectral range by an applied electric field. In this Letter, we demonstrate that the peak wavelength of the selective reflection can be controlled by the surface alignment of the director in sandwich cells. The peak wavelength is blue-shifted when the surface alignment is perpendicular to the bounding plates and red-shifted when it is planar. The effect is explained by the electric field redistribution within the cell caused by a spatially varying heliconical ChOH structure...
April 15, 2018: Optics Letters
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