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Blue light

Tinghong Tan, Yanni Sun, Shishuai Luo, Chao Zhang, Huapeng Zhou, Honghui Lin
Boea hygrometrica (B. hygrometrica) can tolerate severe desiccation and resume photosynthetic activity rapidly upon water availability. However, little is known about the mechanisms by which B. hygrometrica adapts to dehydration and resumes competence upon rehydration. Here we determined how B. hygrometrica to deal with oxidative stress, excessive excitation/electron pressures as well as photosynthetic apparatus modulation during dehydration/rehydration. By measuring ROS generation and scavenging efficiency, we found that B...
September 19, 2017: Plant & Cell Physiology
Ji Woong Lee, Gwang Hoon Kim
Plants and freshwater algae devoid of flagella evolved various photomovements to optimize their photosynthetic efficiency. The filaments of Spirogyra varians exhibit complex swaying and undulating movement and form a compact mat which enables them to adjust their light exposure. Photomovement of filament fragments (1-10 cells) was analyzed using various photoreceptor and cytoskeleton inhibitors under monochromatic light. Different patterns of movement were observed under red and blue light. The filaments showed positive phototropism under blue light...
September 27, 2017: Plant & Cell Physiology
Masahiro Fujiwara, Masaki Kikuchi
The production of purified water by seawater desalination is now a significant countermeasure against recent severe water shortage. As the global warming is thought to be a dominant cause of the water scarcity problem, the energy employed for the desalination should be free from fossil fuels. We recently reported a simple membrane desalination combining the harvesting of solar energy and the membrane permeation of vaporized water. Water on a PTFE (polytetrafluoroethylene) membrane modified with disperse red 1 (DR1) as an azobenzene dye that photo-isomerizes with visible light permeates through it under visible light irradiation...
October 9, 2017: Water Research
Rajendra Kumar Konidena, K R Justin Thomas, Deepak Kumar Dubey, Snehasis Sahoo, Jwo-Huei Jou
A deep-blue emitter was developed by modifying carbazole nuclear positions C2 & C7 with a triphenylamine donor and C3 & C6 with a cyano acceptor. The molecular design features cross-conjugated localized and charge transfer chromophores which results in a hybridized local charge transfer (HLCT) excited state. An organic light emitting diode (OLED) using this material exhibited high external quantum efficiency (6.5%) with excellent color saturation (CIEy ∼ 0.06) and small full-width at half maximum (48 nm).
October 16, 2017: Chemical Communications: Chem Comm
Md Shakir Uddin Ahmed, Ahmad Bin Salam, Clayton Yates, Kyle Willian, Jesse Jaynes, Timothy Turner, Mohamed O Abdalla
As an alternative therapeutic treatment to reduce or eliminate the current side effects associated with advanced prostate cancer (PCa) chemotherapy, a multifunctional double-receptor-targeting iron oxide nanoparticles (IONPs) (luteinizing hormone-releasing hormone receptor [LHRH-R] peptide- and urokinase-type plasminogen activator receptor [uPAR] peptide-targeted iron oxide nanoparticles, LHRH-AE105-IONPs) drug delivery system was developed. Two tumor-targeting peptides guided this double-receptor-targeting nanoscale drug delivery system...
2017: International Journal of Nanomedicine
Xiaoqiong Peng, Wei Qian, Jiangang Hou
This report aims to evaluate the usefulness of 5-aminolevulinic acid (5-ALA) fluorescence-guided Mohs surgery resection of penile-scrotal extramammary Paget's disease for achieving maximum tumor resection. Between January 2014 and December 2015, 5 patients underwent surgical resection of a penile-scrotal extramammary Paget's disease in department of urology, Huashan hospital, Fudan University. All patients were coated with 5-ALA (concentration of 20%) throughout the scrotum and the visible range of the lesion plus a 2cm margin 3 hours before the induction of anesthesia...
October 16, 2017: Bioscience Trends
Jessica Hartwig Duarte, Jorge Alberto Vieira Costa
LEDs have narrow wavelength bands, which can influence microalgae biomass. This study pioneers the evaluation of blue LEDs as an energy source in Chlorella fusca and Synechococcus nidulans cultures. Blue LEDs increased the specific growth rate in Synechococcus nidulans LEB 115 cultures by 80% compared to the standard light used in indoor cultivations. Moreover, blue LEDs also induced lipid accumulation in Chlorella fusca LEB 111 cells, yielding concentrations of this bioproduct of up to 23% (ww(-1)). The chlorophylls and carotenoids were photostimulated proportionally to the LED light intensity...
September 23, 2017: Bioresource Technology
Shaomin Liu, Dinglong Zhu, Jinglin Zhu, Qing Yang, Huijun Wu
A cube-like Ag@AgCl-doped TiO2/sepiolite (denoted Ag@AgCl-TiO2/sepiolite) was successfully synthesized via a novel method. X-ray diffraction, scanning electron microscopy, energy dispersion X-ray fluorescence, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and diffuse reflectance ultraviolet-visible spectroscopy were performed to determine the structure and physicochemical properties of Ag@AgCl-TiO2/sepiolite. SEM micrographs revealed that Ag@AgCl nanoparticles and TiO2 film are well deposited on the surface of tube-like sepiolite...
October 2017: Journal of Environmental Sciences (China)
T Chatzisideri, S Thysiadis, S Katsamakas, P Dalezis, I Sigala, T Lazarides, E Nikolakaki, D Trafalis, O A Gederaas, M Lindgren, V Sarli
A cancer-targeting conjugate 4 of a cyclometalated [N,C,N-Pt(II)] complex bearing a NˆCˆN 1,3-di(2-pyridyl)-benzene with c(RGDyK) peptide as guiding molecule was designed and synthesized for real-time drug delivery monitoring in cancer cells and photodynamic therapy (PDT). This conjugate demonstrates a mild cytostatic effect to six cancer cell lines expressing integrins at different extent, while possessing promising features for PDT. Conjugate 4 demonstrated rapid cell uptake by receptor-mediated endocytosis and efficient generation of (1)O2 upon irradiation...
September 28, 2017: European Journal of Medicinal Chemistry
Yuan Pu, Lifeng Lin, Dan Wang, Jie-Xin Wang, Jun Qian, Jian-Feng Chen
We report a simple, low cost and environmentally friendly method to prepare NaYF4:Yb(3+), Tm(3+) upconversion microphosphors (UCMPs) by thermal decomposition of rare earth-trifluoroacetate precursors using paraffin as the high boiling non-coordinating solvent. The UCMPs exhibited cubic phase with defined shape and bright upconversion luminescence. After coating with amphiphilic polymers of phospholipid-polyethylene glycol, the NaYF4:Yb(3+), Tm(3+) UCMPs were highly dispersed in aqueous solutions and exhibited low cytotoxicity...
October 7, 2017: Journal of Colloid and Interface Science
Hitoshi Nakashima, Jyunya Takahashi, Nobuyuki Fujii, Tsutomu Okuno
Objectives: The objective was to quantify the blue-light hazard from gas metal arc welding (GMAW) of aluminum alloys. The exposure level is expected to depend on the welding conditions. Therefore, it is important to identify the blue-light hazard under various welding conditions. Methods: We experimentally conducted GMAW of aluminum alloys under various welding conditions and measured the spectral radiance of the arcs. The effective blue-light radiance, which the American Conference of Governmental Industrial Hygienists has defined to quantify the exposure level of blue light, was calculated from the measured spectral radiance...
October 1, 2017: Annals of Work Exposures and Health
Pierre Pichon, Adrien Barbet, Jean-Philippe Blanchot, Frédéric Druon, François Balembois, Patrick Georges
Taking advantage of light-emitting-diode (LED) performance breakthrough driven by the lighting market, we report, to the best of our knowledge, the first LED-pumped chromium-doped crystal laser oscillator and amplifier based on alexandrite crystals (Cr(3+):BeAl2O4). We developed a Ce:YAG concentrator as the pumped source, illuminated by blue LEDs that can be easily power scaled. With 2200 LEDs (450 nm), the Ce:YAG concentrator can deliver to the gain medium up to 268 mJ at 10 Hz at 550 nm with a irradiance of 8...
October 15, 2017: Optics Letters
Ruilin Zheng, Qi Zhang, Kehan Yu, Chunxiao Liu, Jianyong Ding, Peng Lv, Wei Wei
A kind of Sn(2+)/Mn(2+) co-doped fluorphosphate (FP) glasses that served as single-component continuous tunable broadband emitting multi-chromatic phosphors are developed for the first time. Importantly, these FP glasses have high thermal conductivity (3.25-3.70  W/m·K) and good chemical stability in water (80°C). By combining with commercially available UV-LEDs directly, the emission colors can be tuned from blue/cold-white to warm-white/red through the energy transfer from Sn(2+) to Mn(2+), and the broadband spectra covering the whole visible region from 380 nm to 760 nm...
October 15, 2017: Optics Letters
Lei Wang, Anca Mazare, Imgon Hwang, Seulgi So, Nhat Truong Nguyen, Patrik Schmuki
We report on free-standing Ta3N5 nanotubular membranes with open top and bottom, used as visible-light-active, flow-through photocatalytic micro-reactors. We grow first a robust anodic Ta2O5 layer, lift-off a membrane and convert to Ta3N5. Such membranes can easily, in a flow-through mode, degrade methylene blue under visible light (wavelength >400 nm) or solar illumination.
October 13, 2017: Chemical Communications: Chem Comm
R A Mukhamadiyarov, N V Rutkovskaya, I V Milto, O D Sidopova, Yu А Kudryavtseva, L S Barbarash
AIM: to investigate the cellular composition of a functionally intact xenopericardial valve in a recipient with acquired mitral defect after long-term implantation. MATERIAL AND METHODS: A Uniline bioconduit (BC) ('Neocor', Kemerovo) removed from the heart in the mitral position at 7.2 years after implantation was investigated. Heart valve leaflets were fixed in a buffered 4% paraformaldehyde solution and imbedded in paraffin or epoxy resin. Slices made from the paraffin samples were stained with hematoxylin and eosin or underwent immunohistochemical (IHC) examination for typing endothelial cells, smooth muscle cells, macrophages, fibroblasts, and T and B lymphocytes...
2017: Arkhiv Patologii
Jenny Lindström, Wiebke Grebner, Kristie Rigby, Erik Selander
Short flashes of blue light (bioluminescence) from dinoflagellates can reduce copepod grazing of light-emitting cells. Other protective strategies against grazing are toxicity, reduced cell chain length and altered swimming patterns in different phytoplankton. Both toxicity and bioluminescence capacity in dinoflagellates decrease in copepod-free cultures, but toxin production can be restored in response to chemical alarm signals from copepods, copepodamides. Here we show that strains of the dinoflagellates Lingulodinium polyedra and Alexandrium tamarense, kept in culture for 14 and 9 years respectively, are capable of increasing their total bioluminescence capacity in response to copepodamides...
October 12, 2017: Scientific Reports
Nathália Bandeira de Melo, Letícia Fernanda Moreira Dos Santos, Mayara Santos de Castro, Raquel Lopes Martins Souza, Marcos José Marques, Aline Pereira Castro, Andreísa Teixeira de Castro, Marina Lara de Carli, João Adolfo Costa Hanemann, Matheus Siqueira Silva, Gabriel de Oliveira Isac Moraes, Luiz Alberto Beijo, Maísa Ribeiro Pereira Lima Brigagão, Felipe Fornias Sperandio
The purpose of this study was to assess, for the very first time, the effects of photodynamic therapy (PDT) on Schistosoma mansoni in vitro by measuring reactive oxygen species (ROS) generation throughout the treatment, as well as the behavior of the parasites (mating, motility and contraction/shortening), and damage to their tegument and excretory systems. The parasites were divided into 4 groups: control, photosensitizer, laser and PDT. Light irradiation was delivered with an InGaAlP low-level laser device operating at 660nm, with 40mW and 100J/cm(2)...
September 22, 2017: Journal of Photochemistry and Photobiology. B, Biology
Andreas Rennhack, Elena Grahn, Benjamin U Kaupp, Thomas K Berger
The voltage-gated proton channel Hv1 is expressed in various human cell types, including macrophages, epithelial cells, and sperm. Hv1 opening leads to proton efflux that alkalizes the cytosol. Here, we describe light-activated Hv1 inhibitors (photoswitches) that allow controlling its activity with high spatiotemporal precision. The photoswitches comprise a light-sensitive azobenzene moiety and 2-guanidinobenzimidazole (2GBI), a known Hv1 inhibitor. In the dark, photoGBI inhibits heterologously expressed Hv1 channels...
October 12, 2017: ACS Chemical Biology
Zhijun Chen, Raweewan Thiramanas, Mischa Schwendy, Chaoming Xie, Sapun H Parekh, Volker Mailänder, Si Wu
Enzyme activity is important for metabolism, cell functions, and treating diseases. However, remote control of enzyme activity in deep tissue remains a challenge. This study demonstrates near-infrared (NIR) light-regulated enzyme activity in living cells based on upconverting nanoparticles (UCNPs) and a photoactivatable Ru complex. The Ru complex is a caged enzyme inhibitor that can be activated by blue light. To prepare a nanocarrier for NIR photoinhibition of enzyme activity, a UCNP and the caged enzyme inhibitors are encapsulated in a hollow mesoporous silica nanoparticle...
October 12, 2017: Small
Patrícia Michelassi Carrinho, Dora Inés Kozusny Andreani, Vislaine de Aguiar Morete, Shizumi Iseri, Ricardo Scarparo Navarro, Antonio Balbin Villaverde
INTRODUCTION: Diabetes Mellitus is a chronic disease that can lead to lower-limb ulceration. The photodynamic therapy (PDT) is based on light interaction with a photosensitizer capable to promote bacterial death and acceleration of wound healing. This study aims to accomplish a macroscopic morphometry evaluation on diabetic ulcer area in humans that were under PDT. MATERIALS AND METHODS: A clinical study was conducted by convenience sample, experimental, controlled, and blinded, composed of 12 patients of both sexes with diabetic ulcers in lower limbs that were divided into two groups, control (n = 6) and PDT (n = 6)...
October 9, 2017: Photomedicine and Laser Surgery
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