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Nelson Pereira Marques, Camila Soares Lopes, Nádia Carolina Teixeira Marques, Leopoldo Cosme-Silva, Thais Marchini Oliveira, Cristiane Duque, Vivien Thiemy Sakai, João Adolfo Costa Hanemann
The aim of this preliminary study was to compare the effects of different energy densities from red and infrared low-level laser (LLL) on viability and proliferation of stem cells from human exfoliated deciduous teeth (SHED). SHED were irradiated with red laser (R) or infrared laser (IR) set with the following dosimetry: 1.2 J/cm2 (0.05 J), 2.5 J/cm2 (0.1 J), 5.0 J/cm2 (0.2 J), and 7.5 J/cm2 (0.3 J). Positive (C+) and negative (C-) control groups comprised non-irradiated cells. Data were analyzed by two-way ANOVA followed by Tukey's test (P < 0...
August 18, 2018: Lasers in Medical Science
Özlem Güzel Tunçcan, Ayşe Kalkancı, Elif Ayca Unal, Olkar Abdulmajed, Merve Erdoğan, Murat Dizbay, Kayhan Çağlar
Background/aim: This study was designed to evaluate the effect of antimicrobial photodynamic treatment (APDT) in a biofilm model using combinations of various dyes (rose bengal, riboflavin, and methylene blue) as photosensitizers and light sources (LED and UVA) against staphylococcal and candidal biofilms. Materials and methods: Sterile microtiter plates were used for the development and quantification of the biofilms. APDT was carried out using combinations of the light sources and dyes...
August 16, 2018: Turkish Journal of Medical Sciences
Yuanying Zhang, Jikang Wang, Wuhong Zhang, Shuting Chen, Lixiang Chen
Twisted light has recently gained enormous interest in communication systems ranging from fiber-optic to radio frequency regimes. Thus far, the light-emitting diode (LED) has not yet been exploited for orbital angular momentum (OAM) encoding to transmit data, which, however, could open up an opportunity towards a new model of secure indoor communication. Here, by multiplexing and demultiplexing red, green and blue (RGB) twisted beams derived from a white light emitting diode, we build a new visible light communication system with RGB colors serving as independent channels and with OAM superposition modes encoding the information...
June 25, 2018: Optics Express
Stefano Pergoloni, Mauro Biagi, Roberto Cusani, Gaetano Scarano
In the emerging framework of visible light communications, the limitation of modulation bandwidth of light emitting diodes (LEDs) transmitters is counterbalanced by the use of red-green-blue (RGB) LEDs since they exhibit higher modulation bandwidth. Using RGB LEDs allows to exploit the spatial multiplexing aspects, that is obtaining parallel channels for transmission. In this context, we used at the receiver RGB-tuned photodiodes (PDs). Hence each PD can, in principle, detect only the information its tuning is matched to...
August 6, 2018: Optics Express
Lili Fan, Rui Yin, Ting Lan, Michael R Hamblin
BACKGROUND: Rosacea is a common chronic cutaneous disorder which is characterized by flushing, erythema, papulopustules and telangiectasia. The pathogenesis of the disease is still unknown. A multifaceted approach is necessary to control the disease because of its tendency to relapse. New more effective treatment options are desirable to achieve a complete remission. Aminolevulinic acid-photodynamic therapy (ALA-PDT) is a well-established treatment for non-melanoma skin cancer and precancerous lesions...
August 14, 2018: Photodiagnosis and Photodynamic Therapy
Paul Olusegun Bankole, Adedotun Adeyinka Adekunle, Sanjay Prabhu Govindwar
Efficient decolorization of cibracron brilliant red 3B-A dye by novel white rot fungal consortium was studied in static and shaking conditions using solid state fermentation technology. Daldinia concentrica (DC) and Xylaria polymorpha (XP) consortium showed dye removal efficiency than the individual strains within 5 days. The enzymes analysis revealed significant inductions in laccase (84%), lignin peroxidase (78%) and manganese peroxidase (65%) by the fungal co-culture (DC + XP), Xylaria polymorpha (XP) and Daldinia concentrica (DC) respectively...
August 15, 2018: International Journal of Biological Macromolecules
Yujin Park, Erik S Runkle
Arrays of blue (B, 400-500 nm) and red (R, 600-700 nm) light-emitting diodes (LEDs) used for plant growth applications make visual assessment of plants difficult compared to a broad (white, W) spectrum. Although W LEDs are sometimes used in horticultural lighting fixtures, little research has been published using them for sole-source lighting. We grew seedlings of begonia (Begonia ×semperflorens), geranium (Pelargonium ×horturum), petunia (Petunia ×hybrida), and snapdragon (Antirrhinum majus) at 20°C under six sole-source LED lighting treatments with a photosynthetic photon flux density (PPFD) of 160 μmol∙m-2∙s-1 using B (peak = 447 nm), green (G, peak = 531 nm), R (peak = 660 nm), and/or mint W (MW, peak = 558 nm) LEDs that emitted 15% B, 59% G, and 26% R plus 6 μmol∙m-2∙s-1 of far-red radiation...
2018: PloS One
Caiyan Ye, Erlong Wang, Shengyu He, Kaiyu Wang, Yi Geng, Qiyao He, Qian Yang, Tao Liu, Heng Xie
Olaquindox as one of the effective antimicrobial agents and growth-promoting feed additives, had been widely used in animal and fish production. However, few studies have been done to unveil its possible toxic effect and tissue injury on aquatic animal. In this study, the toxic effect and underlying mechanisms of olaquindox toxicity were investigated in common carp when feed with different doses of olaquindox for 90 days. The morbidity and mortality, pathological changes, hematology parameters, residue concentration in the tissues of common carp were assessed, hepatocyte apoptosis was detected through ultrastructural observation and flow cytometry methods...
August 10, 2018: Ecotoxicology and Environmental Safety
Karamjyoti Panigrahi, Subhajit Saha, Sumanta Sain, Rituparna Chatterjee, Antika Das, Uttam Kumar Ghorai, Nirmalya Sankar Das, Kalyan Kumar Chattopadhyay
Feeble white emission with a low Colour Rendering Index (CRI) has become the principal gridlock for the extensive commercialization of phosphor converted white LEDs (pc-WLEDs). Fusion of red, green and blue emitting rare-earth (RE) ions in a suitable host can overcome these drawbacks but the energy migration between multiple RE ions at single excitation wavelength defines the key standpoint in designing such white light emitting phosphors. Apart from the abovementioned obstacles, recently traditional optical temperature sensors based on RE ions have faced difficulties due to their low relative sensitivity and large detection error...
August 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Lee W Cohnstaedt, Jordan C Disberger, Eric Paulsen, Adrian J Duehl
Optimized visual attractants will increase insect trapping efficiency by using the target insect's innate behaviors (positive photo-taxis) as a means to lure the insect into a population control or monitoring trap. Light emitting diodes (LEDs) have created customizable lighting options with specific wavelengths (colors), intensities, and bandwidths, all of which can be customized to the target insects. Photo-attraction behavioral bioassays can use LEDs to optimize the attractive color(s) for an insect species down to specific life history stages or behaviors (mating, feeding, or seeking shelter)...
July 26, 2018: Journal of Visualized Experiments: JoVE
Theresa Greupner, Laura Kutzner, Svenja Pagenkopf, Heike Kohrs, Andreas Hahn, Nils Helge Schebb, Jan Philipp Schuchardt
There is a debate about the optimal dietary ratio of the parent n6 fatty acid linoleic acid (LA) and n3 fatty acid alpha-linolenic acid (ALA) to promote an efficient conversion of ALA to EPA and DHA, which have implications for human health. The aim of the present study was to compare the effects of a low-LA/high-ALA (loLA/hiALA) diet with a high-LA/low-ALA (hiLA/loALA) diet on fatty acid concentrations in red blood cells (RBCs). Fifteen omnivore healthy men (mean age 26.1 ± 4.5 years) with a low initial EPA/DHA status (sum (∑) EPA + DHA% of total fatty acids in RBC at baseline: 4...
August 13, 2018: Food & Function
Andrés Felipe Torres Franco, Scarlet da Encarnação Araújo, Fabiana Passos, Carlos Augusto de Lemos Chernicharo, César Rossas Mota Filho, Cleber Cunha Figueredo
Anaerobic digestion of food wastes coupled with digestate post-treatment using microalgae-based systems could recover large amounts of energy and nutrients worldwide. However, the development of full-scale implementations requires overcoming microalgae inhibition by high ammonia concentrations and low light transmittances affecting photosynthesis. This study evaluated the potential of microalgae-based reactors supplied with red light-emitting diodes (LEDs) at low intensity (660 nm and 15 µmol·m-2 ·s-1 ) to treat food waste digestate...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Jessica M Waite, Chris Dardick
Light serves as an important environmental cue in regulating plant architecture. Previous work had demonstrated that both photoreceptor-mediated signaling and photosynthesis play a role in determining the orientation of plant organs. TILLER ANGLE CONTROL 1 (TAC1) was recently shown to function in setting the orientation of lateral branches in diverse plant species, but the degree to which it plays a role in light-mediated phenotypes is unknown. Here, we demonstrated that TAC1 expression was light dependent, as expression was lost under continuous dark or far-red growth conditions, but did not drop to these low levels during a diurnal time course...
August 7, 2018: Journal of Experimental Botany
Henrico Badaoui Strazzi Sahyon, Paloma Pereira da Silva, Murilo Silva de Oliveira, Luciano Tavares Angelo Cintra, João Eduardo Gomes-Filho, Paulo Henrique Dos Santos, Gustavo Sivieri-Araujo
STATEMENT OF PROBLEM: The use of photosensitizers in photodynamic therapy promotes intraradicular microbial reduction during nonsurgical endodontic therapy. However, studies are lacking on the consequences of the application of these agents on the mechanical properties of intraradicular dentin and on the bond strength of glass-fiber posts. PURPOSE: The purpose of this in vitro study was to evaluate the influence of photodynamic therapy on the bond strength of glass-fiber posts using a push-out test and, additionally, to measure the Martens hardness (MH) and elastic indentation modulus (Eit) of intraradicular dentin when different photosensitizers are used...
August 2018: Journal of Prosthetic Dentistry
Koju Kamoi, Manabu Mochizuki, Kyoko Ohno-Matsui
RATIONALE: Dengue fever is a notable emerging infectious disease that is now seen worldwide, with an estimated incidence of approximately 390 million cases per year. Although ocular complications are uncommon among dengue fever-infected patients, caution is needed to prevent vision loss. Here we report a potentially serious sight-threatening complication of dengue fever, dengue fever-associated necrotizing scleritis. PATIENT CONCERNS AND DIAGNOSIS: After being bitten by mosquitoes, a 60-year-old Japanese female exhibited positive serologic tests of immunoglobulin M and G enzyme immunoassays for dengue viral infection along with a decrease of leukocytes and platelets...
August 2018: Medicine (Baltimore)
Yunting Zhang, Wenjie Hu, Xiaorui Peng, Bo Sun, Xiaorong Wang, Haoru Tang
LED-based light sources that can provide narrowly-centered spectrum have been frequently applied to manipulate the plant growth, development and metabolism in recent years. This study aimed to find out the effect of different light qualities on the production of anthocyanins and proanthocyanidins. The results showed RL (red light), BL (blue light), RBL (red light: blue light = 1:1) induced the strawberry fruit coloration earlier by increasing the content of total anthocyanins as a result of high expression of related genes, which was also concluded from a⁎ , C⁎ , h° values in 'Tokun' at 28 DAF, and RBL significantly promoted anthocyanin and proanthocyanidin biosynthesis in these two strawberry genotypes during fruit development...
July 29, 2018: Journal of Photochemistry and Photobiology. B, Biology
Long Ma, Jun-Yi Liu, Jia-Xin Dong, Qi Xiao, Jie Zhao, Feng-Lei Jiang
Pb2+ exposure in humans occurs mainly through air inhalation, food and water uptake which has been shown to be generally associated with numerous body functions such as the central and peripheral nervous systems, the red blood cells, the kidneys and the liver. It has been reported that the liver is the storage site and an important primary target in Pb2+ toxicity, and the hepatotoxicity of Pb2+ could be resulted from the impairment of the liver mitochondria. In this study, several mitochondrial dysfunctions following the addition of Pb2+ (10-160 μM) were investigated...
November 1, 2017: Toxicology Research
Alice M Stamatakis, Mike J Schachter, Srishti Gulati, Kevin T Zitelli, Sam Malanowski, Arash Tajik, Christopher Fritz, Mark Trulson, Stephani L Otte
The ability to precisely monitor and manipulate neural circuits is essential to understand the brain. Advancements over the last decade in optical techniques such as calcium imaging and optogenetics have empowered researchers to gain insight into brain function by systematically manipulating or monitoring defined neural circuits. Combining these cutting-edge techniques enables a more direct mechanism for ascribing neural dynamics to behavior. Here, we developed a miniaturized integrated microscope that allows for simultaneous optogenetic manipulation and cellular-resolution calcium imaging within the same field of view in freely behaving mice...
2018: Frontiers in Neuroscience
Yuhua Yao, Qian Sun, Zhaoyang Chen, Rui Huang, Weibing Zhang, Junhong Qian
A near infrared fluorescent probe YSP for sulfite was synthesized, in which a julolidine fused with a pyran-2-one was employed as the fluorophore and the vinyl activated by an indole salt as the receptor. The introduction of julolidine and indole salt strengthens the electron push-pull effect of the probe and allows it to absorb (597 nm) and emit (681 nm) in red wavelength region. The addition of sulfite to the C˭C bond led to prominent blue-shifts in both absorption (171 nm) and emission (165 nm) spectra, which made it possible for colorimetric and ratiometric fluorescent detection of sulfite...
November 1, 2018: Talanta
Gabriela Russo Soeiro Campos, Kátia Margareth Bitton de Moura, Ana Maria Barbosa, Luis Fernando Zamuner, Nikele Nadur-Andrade, Camila Squarzoni Dale, José María Gutiérrez, Maria Cristina Chavantes, Stella Regina Zamuner
The therapeutic effect of the Light Emitting Diode (LED) treatment in two wavelengths (635 or 945 nm) was evaluated in the local pathological alterations induced by Bothrops asper snake venom. Mice received irradiation of infrared LED (120 mW, 945 nm) or red LED (110 mW, 635 nm) applied immediately, 1 and 2 h after venom injection. LED treatment reduced edema formation in the plantar region and gastrocnemius muscle and significantly reduced neutrophil migration and hyperalgesia after the venom injection...
August 3, 2018: Toxicon: Official Journal of the International Society on Toxinology
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