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https://www.readbyqxmd.com/read/28324762/chrysanthemum-morphology-photosynthetic-efficiency-and-antioxidant-capacity-are-differentially-modified-by-light-quality
#1
Liang Zheng, Marie-Christine Van Labeke
The effect of light quality on leaf morphology, photosynthetic efficiency and antioxidant capacity of leaves that fully developed under a specific spectrum was investigated in Chrysanthemum cv. Four light treatments were applied at 100μmolm(-2)s(-1) and a photoperiod of 14h using light-emitting diodes, which were 100% red (R), 100% blue (B), 75% red with 25% blue (RB) and white (W), respectively. Intraspecific variation was investigated by studying the response of eight cultivars. Overall, red light significantly decreased the leaf area while the thinnest leaves were observed for W...
March 11, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28324593/phosphorescent-neutral-iridium-iii-complexes-for-organic-light-emitting-diodes
#2
REVIEW
Abd Rashid Bin Mohd Yusoff, Aron J Huckaba, Mohammad Khaja Nazeeruddin
The development of transition metal complexes for application in light-emitting devices is currently attracting significant research interest. Among phosphorescent emitters, those involving iridium (III) complexes have proven to be exceedingly useful due to their relatively short triplet lifetime and high phosphorescence quantum yields. The emission wavelength of iridium (III) complexes significantly depends on the ligands, and changing the electronic nature and the position of the ligand substituents can control the properties of the ligands...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28320099/light-emitting-diode-led-therapy-improves-occipital-cortex-damage-by-decreasing-apoptosis-and-increasing-bdnf-expressing-cells-in-methanol-induced-toxicity-in-rats
#3
Amir Ghanbari, Majid Ghareghani, Kazem Zibara, Hamdallah Delaviz, Elham Ebadi, Mohammad Hossein Jahantab
Methanol-induced retinal toxicity, frequently associated with elevated free radicals and cell edema, is characterized by progressive retinal ganglion cell (RGC) death and vision loss. Previous studies investigated the effect of photomodulation on RGCs, but not the visual cortex. In this study, the effect of 670nm Light-Emitting Diode (LED) therapy on RGCs and visual cortex recovery was investigated in a seven-day methanol-induced retinal toxicity protocol in rats. Methanol administration showed a reduction in the number of RGCs, loss of neurons (neuronal nuclear antigen, NeuN+), activation of glial fibrillary acidic protein (GFAP+) expressing cells, suppression of brain-derived neurotrophic factor (BDNF+) positive cells, increase in apoptosis (caspase 3+) and enhancement of nitric oxide (NO) release in serum and brain...
March 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28319422/phototherapy-for-improvement-of-performance-and-exercise-recovery-comparison-of-3-commercially-available-devices
#4
Thiago De Marchi, Vinicius Mazzochi Schmitt, Carla Danúbia da Silva Fabro, Larissa Lopes da Silva, Juliane Sene, Olga Tairova, Mirian Salvador
CONTEXT:   Recent studies suggest the prophylactic use of low-powered laser/light has ergogenic effects on athletic performance and postactivity recovery. Manufacturers of high-powered lasers/light devices claim that these can produce the same clinical benefits with increased power and decreased irradiation time; however, research with high-powered lasers is lacking. OBJECTIVE:   To evaluate the magnitude of observed phototherapeutic effects with 3 commercially available devices...
March 20, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28319374/mechanisms-of-energy-transfer-and-enhanced-stability-of-carbidonitride-phosphors-for-solid-state-lighting
#5
Christopher Grieco, Kurt F Hirsekorn, Andrew T Heitsch, Alan C Thomas, Mark H McAdon, Britt A Vanchura, Michael M Romanelli, Lora L Brehm, Anne Leugers, Anatoliy Sokolov, John B Asbury
Phosphor-converted light emitting diodes (pcLEDs) produce white light through the use of phosphors that convert blue light emitted from the LED chip into green and red wavelengths. Understanding the mechanisms of degradation of the emission spectra and quantum yields of the phosphors used in pcLEDs is of critical importance to fully realize the potential of solid state lighting as an energy efficient technology. Toward this end, time-resolved photoluminescence spectroscopy was used to identify the mechanistic origins of enhanced stability and luminescence efficiency that can be obtained from a series of carbidonitride red phosphors with varying degree of substitutional carbon...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318234/light-absorbing-brown-carbon-aerosol-constituents-from-combustion-of-indonesian-peat-and-biomass
#6
Sri Hapsari Budisulistiorini, Matthieu Riva, Michael Williams, Jing Chen, Masayuki Itoh, Jason Douglas Surratt, Mikinori Kuwata
Light-absorbing brown carbon (BrC) constituents of organic aerosol (OA) have been shown to significantly absorb ultra-violet (UV) and visible light, and thus, impact radiative forcing. However, molecular identification of the BrC constituents is still limited. In this study, we characterize BrC constituents at the molecular level in: i) aerosols emitted by combustion of peat, fern/leaf, and charcoal from Indonesia and ii) ambient aerosols collected in Singapore during the 2015 haze episode. Aerosols were analyzed using ultra-performance liquid chromatography interfaced to a diode array detector and electrospray ionization high-resolution quadrupole time-of-flight mass spectrometer (UPLC/DAD-(-)ESI-HR-QTOFMS) operated in the negative ion mode...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28304161/syntheses-photoluminescence-and-electroluminescence-of-a-series-of-sublimable-bipolar-cationic-cuprous-complexes-with-thermally-activated-delayed-fluorescence
#7
Fuli Zhang, Yuqiao Guan, Xulin Chen, Shuangshuang Wang, Dong Liang, Yafei Feng, Shufen Chen, Suzhi Li, Zhongyi Li, Fuqiang Zhang, Canzhong Lu, Guangxiu Cao, Bin Zhai
Three thermally activated delayed fluorescence cationic cuprous complexes [Cu(POP) (ECAF)]PF6 (1, POP = bis(2-diphenylphosphinophenyl)ether, ECAF = 9,9-bis(9-ethylcarbazol-3-yl)-4,5-diazafluorene), [Cu(POP) (EHCAF)]PF6 (2, EHCAF = 9,9-bis(9-ethylhexylcarbazol-3-yl)-4,5-diazafluorene), and [Cu(POP) (PCAF)]PF6 (3, PCAF = 9,9-bis(9-phenylcarbazaol-3-yl)-4,5-diazafluorene) with bipolar 4,5-diazafluorene ligand substituted by bis-carbazole have been successfully prepared, and their UV absorption, photoluminescent properties, and electrochemical behaviors were investigated...
March 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28302857/epitaxial-lift-off-of-electrodeposited-single-crystal-gold-foils-for-flexible-electronics
#8
Naveen K Mahenderkar, Qingzhi Chen, Ying-Chau Liu, Alexander R Duchild, Seth Hofheins, Eric Chason, Jay A Switzer
We introduce a simple and inexpensive procedure for epitaxial lift-off of wafer-size flexible and transparent foils of single-crystal gold using silicon as a template. Lateral electrochemical undergrowth of a sacrificial SiO x layer was achieved by photoelectrochemically oxidizing silicon under light irradiation. A 28-nanometer-thick gold foil with a sheet resistance of 7 ohms per square showed only a 4% increase in resistance after 4000 bending cycles. A flexible organic light-emitting diode based on tris(bipyridyl)ruthenium(II) that was spin-coated on a foil exploited the transmittance and flexibility of the gold foil...
March 17, 2017: Science
https://www.readbyqxmd.com/read/28301082/ch3nh3pbbr3-perovskite-nanocrystals-as-efficient-light-harvesting-antenna-for-fluorescence-resonance-energy-transfer
#9
Vijayakumar C Nair, Chinnadurai Muthu, Anuja Vijayan
Hybrid perovskites have created enormous research interest as a low-cost material for high-performance photovoltaic devices, light-emitting diodes, photodetectors, memories and sensors. Perovskite materials in nanocrystal form, show intense luminescence due to quantum confinement effect, were found to be particularly suitable for most of these applications. However, the potential use of perovskite nanocrystals as a light harvesting antenna for possible applications in artificial photosynthesis systems is not yet explored...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28300754/effects-of-light-emitting-diode-irradiation-on-growth-characteristics-and-regulation-of-porphyrin-biosynthesis-in-rice-seedlings
#10
Lien Hong Tran, Sunyo Jung
We examined the effects of light quality on growth characteristics and porphyrin biosynthesis of rice seedlings grown under different wavelengths from light emitting diodes (LEDs). After 10 days of exposure to various wavelengths of LEDs, leaf area and shoot biomass were greater in seedlings grown under white and blue LEDs than those of green and red LEDs. Both green and red LED treatments drastically decreased levels of protoporphyrin IX (Proto IX) and Mg-porphyrins compared to those of white LED, while levels of Mg-Proto IX monomethyl ester and protochlorophyllide under blue LED were decreased by 21% and 49%, respectively...
March 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28300605/a-rapid-quantification-of-binocular-misalignment-without-recording-eye-movements-vertical-and-torsional-alignment-nulling
#11
Kara H Beaton, Mark J Shelhamer, Dale C Roberts, Michael C Schubert
BACKGROUND: Small, innate asymmetries between the left and right otolith organs can cause ocular misalignment with symptoms that include double vision and motion sickness. Additionally, ocular misalignment affects nearly 5% of the US population. We have developed a portable, non-invasive technology that uses subjective perception of binocular visual signals to estimate relative binocular alignment. NEW METHOD AND RESULTS: The Vertical Alignment Nulling (VAN) and Torsional Alignment Nulling (TAN) tests ask subjects to view one red and one blue line on a tablet computer while looking through color-matched red and blue filters so that each eye sees only one of the lines...
March 11, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28295740/green-light-inhibits-gnrh-i-expression-by-stimulating-the-melatonin-gnih-pathway-in-the-chick-brain
#12
Liwei Zhang, Funing Chen, Jing Cao, Yulan Dong, Zixu Wang, Man Hu, Yaoxing Chen
To study the mechanism by which monochromatic light affects gonadotropin-releasing hormone (GnRH) expression in chicken hypothalamus, a total of 192 newly hatched chicks were divided into intact, sham-operated and pinealectomy groups and exposed to white (WL), red (RL), green (GL) and blue (BL) lights using a light-emitting diode (LED) system for 2 wk. In the GL intact group, the mRNA and protein levels of GnRH-I in the hypothalamus, the mean cell area and mean cell optical density (OD) of the GnRH-I-ir cells of the nucleus commissurae pallii (nCPa) were decreased by 13...
March 14, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28294329/multidie-led-combined-with-homogenizing-optics-to-improve-frequency-response-and-intensity-for-flim-applications
#13
H-T Liu, W-L Lin, Y-L Feng, Y Lin, Y-C Chen
Application of light-emitting diodes (LEDs) in frequency-domain fluorescence lifetime imaging microscopy (FLIM) has been limited by the trade-off between modulation frequency and illumination intensity of LEDs, which affects the signal-to-noise ratio in fluorescence lifetime measurements. To increase modulation frequency without sacrificing output power of LEDs, we propose to use LEDs with multiple dice connected in series. The LED capacitance was reduced with series connection; therefore, the frequency response of multidie LED was significantly increased...
March 15, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28294166/effects-of-gan-algan-sputtered-aln-nucleation-layers-on-performance-of-gan-based-ultraviolet-light-emitting-diodes
#14
Hongpo Hu, Shengjun Zhou, Xingtong Liu, Yilin Gao, Chengqun Gui, Sheng Liu
We report on the demonstration of GaN-based ultraviolet light-emitting diodes (UV LEDs) emitting at 375 nm grown on patterned sapphire substrate (PSS) with in-situ low temperature GaN/AlGaN nucleation layers (NLs) and ex-situ sputtered AlN NL. The threading dislocation (TD) densities in GaN-based UV LEDs with GaN/AlGaN/sputtered AlN NLs were determined by high-resolution X-ray diffraction (XRD) and cross-sectional transmission electron microscopy (TEM), which revealed that the TD density in UV LED with AlGaN NL was the highest, whereas that in UV LED with sputtered AlN NL was the lowest...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28293941/rational-design-and-characterization-of-heteroleptic-phosphorescent-complexes-for-highly-efficient-deep-red-organic-light-emitting-devices
#15
Guomeng Li, Ping Li, Xuming Zhuang, Kaiqi Ye, Yu Liu, Yue Wang
Two new deep-red iridium(III) complexes, (fpiq)2Ir(dipba) (fIr1) and (f2piq)2Ir(dipba) (dfIr2), comprising two cyclometaling ligands of fluorophenyl-isoquinoline derivatives (fpiq and f2piq) and a N-heterocyclic carbene (NHC)-based ancillary ligand of N,N'-diisopropylbenzamidinate (dipba) are designed, synthesized and characterized. Given the unique four-membered Ir-N-C-N backbone built by the metal center and the ancillary ligand, both phosphors achieve significant improvement for their comprehensive optoelectronic characteristics...
March 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28293892/light-regulated-protein-kinases-based-on-the-cry2-cib1-system
#16
Wignand W D Mühlhäuser, Maximilian Hörner, Wilfried Weber, Gerald Radziwill
Optogenetic approaches enable the control of biological processes in a time- and space-resolved manner. These light-based methods are noninvasive and by using light as sole activator minimize side effects in contrast to chemical inducers. Here, we provide a protocol for the targeted control of the activity of protein kinases in mammalian cells based on the photoreceptor cryptochrome 2 (CRY2) of Arabidopsis thaliana and its interaction partner CIB1. Blue light (450 nm)-induced binding of CRY2 to CIB1 allows the recruitment of a chimeric cytosolic protein kinase AKT1 to the plasma membrane accompanied with stimulation of its kinase activity...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28291021/laser-patterning-of-highly-conductive-flexible-circuits
#17
Seok Young Ji, Muhammed Ajmal Chathanchira, Taehun Kim, Won Seok Chang, Seunghyun Baik
There has been considerable attention in highly conductive flexible adhesive (CFA) materials as electrodes and interconnectors for future flexible electronic devices. However, the patterning technology still needs to be developed to construct micro-scale electrodes and circuits. Here we developed the selective laser sintering technology where the pattering and curing were accomplished simultaneously without making additional masks. The CFA was composed of micro-scale Ag flakes, multiwalled carbon nanotubes decorated with Ag nanoparticles, and nitrile-butadiene-rubber matrix...
March 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28290591/self-planarized-quantum-disks-in-nanowires-ultraviolet-b-emitters-utilizing-pendeo-epitaxy
#18
B Janjua, H Sun, C Zhao, D H Anjum, F Wu, A A Alhamoud, X Li, A M Albadri, A Y Alyamani, M M El-Desouki, T K Ng, B S Ooi
The growth of self-assembled, vertically oriented and uniform nanowires (NWs) has remained a challenge for efficient light-emitting devices. Here, we demonstrate dislocation-free AlGaN NWs with spontaneous coalescence, which are grown by plasma-assisted molecular beam epitaxy on an n-type doped silicon (100) substrate. A high density of NWs (filling factor >95%) was achieved under optimized growth conditions, enabling device fabrication without planarization using ultraviolet (UV)-absorbing polymer materials...
March 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28290547/rare-metal-free-high-performance-ga-sn-o-thin-film-transistor
#19
Tokiyoshi Matsuda, Kenta Umeda, Yuta Kato, Daiki Nishimoto, Mamoru Furuta, Mutsumi Kimura
Oxide semiconductors have been investigated as channel layers for thin film transistors (TFTs) which enable next-generation devices such as high-resolution liquid crystal displays (LCDs), organic light emitting diode (OLED) displays, flexible electronics, and innovative devices. Here, high-performance and stable Ga-Sn-O (GTO) TFTs were demonstrated for the first time without the use of rare metals such as In. The GTO thin films were deposited using radiofrequency (RF) magnetron sputtering. A high field effect mobility of 25...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28290197/highly-conductive-and-uniform-alginate-silver-nanowire-composite-transparent-electrode-by-room-temperature-solution-processing-for-organic-light-emitting-diode
#20
Lu Lian, Dan Dong, Shuai Yang, Bingwu Wei, Gufeng He
A novel transparent electrode composed of Alginate/silver nanowire (AgNW) with high conductivity and low roughness is fabricated via solution process at room temperature. Sol-gel transition of the Alginate triggered by CaCl2 solution bonds the AgNWs to the substrate tightly. Meanwhile, Cl- in the solution can renovate the cracks on the AgNW surfaces created during the mechanical pressing, resulting in a great increase of the electrical conductivity. The Alginate/AgNW composite film can reach a sheet resistance of 2...
March 14, 2017: ACS Applied Materials & Interfaces
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