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Blue light

Imran Zada, Wang Zhang, Wangshu Zheng, Yuying Zhu, Zhijian Zhang, Jianzhong Zhang, Muhammad Imtiaz, Waseem Abbas, Di Zhang
The negative replica of biomorphic TiO2 with nano-holes structure has been effectively fabricated directly from nano-nipple arrays structure of cicada wings by using a simple, low-cost and highly effective sol-gel ultrasonic method. The nano-holes array structure was well maintained after calcination in air at 500 °C. The Ag nanoparticles (10 nm-25 nm) were homogeneously decorated on the surface and to the side wall of nano-holes structure. It was observed that the biomorphic Ag-TiO2 showed remarkable photocatalytic activity by degradation of methyl blue (MB) under UV-vis light irradiation...
December 8, 2017: Scientific Reports
Amalia Mira, C Reyes Mateo, Ricardo Mallavia, Alberto Falco
New biomaterials are sought for the development of bioengineered nanostructures. In the present study, electrospun nanofibers have been synthesized by using poly(methyl vinyl ether-alt-maleic acid) and poly(methyl vinyl ether-alt-maleic ethyl monoester) (PMVEMA-Ac and PMVEMA-ES, respectively) as building polymers for the first time. To further functionalize these materials, nanofibers of PMVEMA-Ac and PMVEMA-ES containing a conjugated polyelectrolyte (HTMA-PFP, blue emitter, and HTMA-PFNT, red emitter) were achieved with both forms maintaining a high solid state fluorescence yield without altered morphology...
December 8, 2017: Scientific Reports
Ana Paula Pinto, Isabela Bueno Rosseti, Moisés Lopes Carvalho, Bruna Graziele Marques da Silva, Carlos Alberto-Silva, Maricilia Silva Costa
BACKGROUND: Candida albicans is an opportunistic fungus producing both superficial and systemic infections, especially in immunocompromised individuals. It has been demonstrated that C. albicans ability to form biofilms is a crucial process for colonization and virulence. Furthermore, a correlation between the development of drug resistance and biofilm maturation at Candida biofilms has been shown. Photodynamic Antimicrobial Chemotherapy (PACT) is a potential antimicrobial therapy that combines visible light and a non-toxic dye, known as a photosensitizer, producing reactive oxygen species (ROS) that can kill the treated cells...
December 5, 2017: Photodiagnosis and Photodynamic Therapy
Leah Y Kuritzky, Andrew C Espenlaub, Benjamin P Yonkee, Christopher D Pynn, Steven P DenBaars, Shuji Nakamura, Claude Weisbuch, James S Speck
Commercial LEDs for solid-state lighting are often designed for operation at current densities in the droop regime (~35 A/cm2) to minimize costly chip area; however, many benefits can be realized by operating at low current density (J ≈1 - 5 A/cm2). Along with mitigation of droop losses and reduction of the operating voltage, low J operation of LEDs opens the design space for high light extraction efficiency (LEE). This work presents detailed ray tracing simulations of an LED design for low J operation with LEE ≈94%...
November 27, 2017: Optics Express
Hyuntai Kim, Jinseob Kim, Haechan An, Yohan Lee, Gun-Yeal Lee, Jeongkyun Na, Kyoungyoon Park, Seungjong Lee, Seung-Yeol Lee, Byoungho Lee, Yoonchan Jeong
We propose and investigate a metallic Fresnel zone plate (FZP/MFZP) implemented on a silver-coated optical fiber facet for super-variable focusing of light, the focal point of which can be drastically relocated by varying the wavelength of the incident light. We numerically show that when its nominal focal length is set to 20 μm at 550 nm, its effective focal length can be tuned by ~13.7 μm for 300-nm change in the visible wavelength range. This tuning sensitivity is over 20 times higher than that of a conventional silica-based spherical lens...
November 27, 2017: Optics Express
Jana Ryckaert, António Correia, Mickael D Tessier, Dorian Dupont, Zeger Hens, Peter Hanselaer, Youri Meuret
Quantum dots can be used in white LEDs for lighting applications to fill the spectral gaps in the combined emission spectrum of the blue pumping LED and a broad band phosphor, in order to improve the source color rendering properties. Because quantum dots are low scattering materials, their use can also reduce the amount of backscattered light which can increase the overall efficiency of the white LED. The absorption spectrum and narrow emission spectrum of quantum dots can be easily tuned by altering their synthesis parameters...
November 27, 2017: Optics Express
Chhabilal Regmi, Dipesh Dhakal, Soo Wohn Lee
Ag-loaded BiVO4 visible-light-driven photocatalyst was synthesized by microwave hydrothermal method followed by photodeposition. Photocatalytic performance of the synthesized samples were evaluated on the mixed dye (methylene blue and rhodamine B), as well as bisphenol A in aqueous solution. Similarly, the disinfection activities of synthesized samples towards the gram-negative Escherichia coli (E. coli) a model cell were investigated under visible light irradiation condition (λ≥420 nm). The synthesized samples have monoclinic-scheelite structure...
December 8, 2017: Nanotechnology
Jianwei Ma, Takahiro Hiratsuka, Tsuyoshi Etoh, Junko Akada, Hajime Fujishima, Norio Shiraishi, Yoshio Yamaoka, Masafumi Inomata
BACKGROUND AND AIM: Infection by Helicobacter pylori is implicated in a wide range of upper gastrointestinal diseases. Owing to the rapid emergence of antibiotic-resistant strains of H. pylori, the development of novel treatment modalities for antibiotic-resistant H. pylori infection is a key priority. Blue light-emitting diodes (LED) may represent a unique option owing to their antimicrobial effect. In this study, we aimed to evaluate the anti-proliferative effect of blue LED against antibiotic-resistant H...
December 7, 2017: Journal of Gastroenterology and Hepatology
Duo Pan, Shengsong Ge, Xiyu Zhang, Xianmin Mai, Shengyao Li, Zhanhu Guo
Indium oxide (In2O3) hollow microspheres were prepared using yeast as a bio-template with the aid of a precipitation method. The yeast provided a solid frame for the deposition of In(OH)3 to form the precursor. The resulting In2O3 hollow microspheres were obtained by calcining the precursor at 650 °C. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms and UV-Vis diffuse reflectance spectroscopy...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Yoshikazu Yoshifuku, Yoji Sanomura, Shiro Oka, Mio Kurihara, Takeshi Mizumoto, Tomohiro Miwata, Yuji Urabe, Toru Hiyama, Shinji Tanaka, Kazuaki Chayama
BACKGROUND: Blue laser imaging (BLI) and linked color imaging (LCI) are the color enhancement features of the LASEREO endoscopic system, which provide a narrow band light observation function and expansion and reduction of the color information, respectively. METHODS: We examined 82 patients with early gastric cancer (EGC) diagnosed between April 2014 and August 2015. Five expert and 5 non-expert endoscopists retrospectively compared images obtained on non-magnifying BLI bright mode (BLI-BRT) and LCI with those obtained via conventional white light imaging (WLI)...
December 8, 2017: BMC Gastroenterology
Ruijuan Ma, Skye R Thomas-Hall, Elvis T Chua, Faisal Alsenani, Eladl Eltanahy, Michael E Netzel, Gabriele Netzel, Yinghua Lu, Peer M Schenk
Haematococcus pluvialis is a green microalga of major interest to industry based on its ability to produce large amounts of astaxanthin. Biosynthesis of astaxanthin and its mono- and di-esters was significantly stimulated under 150 μmol m-2 s-1 of white LED (W-150) compared with lower light intensities, but the highest astaxanthin amounts were produced under 70 μmol m-2 s-1 of blue LED (B-70). Transcripts of astaxanthin biosynthesis genes psy, crtO, and bkt2 were upregulated under W-150, while psy, lcy, crtO, and crtR-B were upregulated by B-70...
December 4, 2017: Bioresource Technology
Tomáš Zavřel, Petra Očenášová, Jan Červený
Synechocystis sp. PCC 6803 is a widely used model cyanobacterium, whose substrains can vary on both genotype and phenotype levels. Previously described phenotypic variations include ability of mixotrophic growth, ability of movement on agar plates and variations in pigments composition or cell size. In this study, we report for the first time significant variation among Synechocystis substrains in complex cellular traits such as growth rate, photosynthesis efficiency, cellular dry weight and cellular composition (including protein or carbohydrates content)...
2017: PloS One
Sunil Kim, Fauzia Iqbal, Hyungsun Kim
SiO2-B2O3-ZnO-Li2O glass and four types of phosphors (Y3Al5O12:Ce3+, (Sr,Ba)Si2O2N2:Eu2+, CaAlSiN3:Eu2+, and Lu3Al5O12:Ce3+) with different spectral distributions and thermal properties were prepared to achieve the desired color point based on the relationship between the thermal properties of phosphors and the microstructure of the phosphor-in-glass (PIG). The glass frit was mixed with various contents of phosphors (2.5, 5.0, 7.5, and 10.0 vol%) and then sintered to form a PIG. It was confirmed that the different pore properties of each PIG, caused by the difference in phosphor thermal properties, have a strong influence on the optical properties of the PIG...
December 1, 2017: Applied Optics
Wen-Juan Ji, Rui-Qing Hao, Wei-Wei Pei, Lin Feng, Quan-Guo Zhai
Two novel isoreticular cadmium metal-organic frameworks (MOFs) with the framework formula of [Cd2(BPTC)(solvent)3] (H4BPTC = 3,3',5,5'-biphenyltetracarboxylic acid) have been constructed under diverse reaction conditions and characterized by single crystal X-ray diffraction, PXRD, IR and TGA. The neutral 3D frameworks of 1 and 2 with one-dimensional (1D) rhombic channels exhibit both distinct uptake and good selectivity for cationic methylene blue (MB) dye molecules. The adsorption capacity and adsorption kinetic constant of 2 are greater than those of 1, showing the importance of porosity and pore size during the adsorption...
December 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Gábor G Deák, Wolfgang M Schmidt, Reginald E Bittner, Georgios Mylonas, Philipp K Roberts, Stefan Zotter, Bernhard Baumann, Michael Pircher, Christoph K Hitzenberger, Ursula M Schmidt-Erfurth, Markus Ritter
PURPOSE: To examine the involvement of the retinal pigment epithelium (RPE) in the presence of vitelliform macular lesions (VML) in Best vitelliform macular dystrophy (BVMD), autosomal recessive bestrophinopathy, and adult-onset vitelliform macular degeneration using polarization-sensitive optical coherence tomography (PS-OCT). METHODS: A total of 35 eyes of 18 patients were imaged using a PS-OCT system and blue light fundus autofluorescence imaging. Pathogenic mutations in the BEST1 gene, 3 of which were new, were detected in all patients with BVMD and autosomal recessive bestrophinopathy...
December 5, 2017: Retina
Ali Mehrizad, Parvin Gharbani
Zinc sulfide nanoparticles (ZnS-NPs) were synthesized via a simple and facile co-precipitation method and were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and diffuse reflectance spectroscopy (DRS). Photocatalytic activity of synthesized nanoparticles was evaluated in removal of double azo dye Direct Blue 14 (DB14) from aqueous media. Optimization of photocatalytic removal of DB14 was studied using response surface methodology (RSM). Based on the results, DB14 removal efficiency increased with increasing intensity and duration of UV light irradiation, whereas the higher pH and higher initial dye concentration were unfavorable...
October 2017: Journal of Water and Health
Jingwei Wang, Rong Zheng, Huan Chen, Huimei Yao, Liyu Yan, Jie Wei, Zhenghuan Lin, Qidan Ling
Maleimide and benzene are employed as a dendron and a core, respectively, to construct two series of non-conjugate branched oligomers (B3G1 and B1G2) based on diarylmaleimide fluorophores by an alkylation reaction. Surface aryl groups are changed to tune the emissive color of branched oligomers from blue (λem = 480 nm) to red (λem = 651 nm), realizing full-color emission. The investigation on the photophysical properties of the oligomers indicates that they display intense emission in both solution and solid films, due to the suppression of intramolecular rotation and intermolecular interaction...
December 7, 2017: Organic & Biomolecular Chemistry
James N Bull, Michael S Scholz, Eduardo Carrascosa, Evan J Bieske
Substituted azobenzenes serve as chromophores and actuators in a wide range of molecular photoswitches. Here, tandem ion mobility spectrometry coupled with laser excitation is used to investigate the photoisomerisation of selected E and Z isomers of the charge-tagged azobenzene, methyl orange. Both isomers display a weak S1(nπ*) photoisomerisation response in the blue part of the spectrum peaking at 440 nm and a more intense S2(ππ*) photoisomerisation response in the near-UV with maxima at 370 and 310 nm for the E and Z isomers, respectively...
December 7, 2017: Physical Chemistry Chemical Physics: PCCP
Xinping Chen, Hana Hall, Jeffrey P Simpson, Walter D Leon-Salas, Donald F Ready, Vikki M Weake
Lipid peroxides are generated by oxidative stress in cells, and contribute to ageing and neurodegenerative disease. The eye is at special risk for lipid peroxidation because photoreceptors possess amplified sensory membranes rich in peroxidation-susceptible polyunsaturated fatty acids. Light-induced lipid peroxidation in the retina contributes to retinal degeneration, and lipid peroxidation has been implicated in the progression of age-associated ocular diseases such as age-related macular degeneration (AMD)...
2017: NPJ Aging and Mechanisms of Disease
Sahil Bajaj, John R Vanuk, Ryan Smith, Natalie S Dailey, William D S Killgore
Mild traumatic brain injury (mTBI) is a common and often inconspicuous wound that is frequently associated with chronic low-grade symptoms and cognitive dysfunction. Previous evidence suggests that daily blue wavelength light therapy may be effective at reducing fatigue and improving sleep in patients recovering from mTBI. However, the effects of light therapy on recovering brain structure remain unexplored. In this study, we analyzed white matter diffusion properties, including generalized fractional anisotropy, and the quantity of water diffusion in isotropic (i...
2017: Frontiers in Neurology
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