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https://www.readbyqxmd.com/read/28335375/assessing-the-spectral-properties-of-sunlit-and-shaded-components-in-rice-canopies-with-near-ground-imaging-spectroscopy-data
#1
Kai Zhou, Xinqiang Deng, Xia Yao, Yongchao Tian, Weixing Cao, Yan Zhu, Susan L Ustin, Tao Cheng
Monitoring the components of crop canopies with remote sensing can help us understand the within-canopy variation in spectral properties and resolve the sources of uncertainties in the spectroscopic estimation of crop foliar chemistry. To date, the spectral properties of leaves and panicles in crop canopies and the shadow effects on their spectral variation remain poorly understood due to the insufficient spatial resolution of traditional spectroscopy data. To address this issue, we used a near-ground imaging spectroscopy system with high spatial and spectral resolutions to examine the spectral properties of rice leaves and panicles in sunlit and shaded portions of canopies and evaluate the effect of shadows on the relationships between spectral indices of leaves and foliar chlorophyll content...
March 13, 2017: Sensors
https://www.readbyqxmd.com/read/28334690/intracellular-fluorescent-light-up-bioprobes-with-different-morphology-for-image-guided-photothermal-cancer-therapy
#2
Bangbang Li, Peng Zhang, Jianwei Du, Xiao Zhao, Youxiang Wang
Multifunctional nanoprobe was drawing increased attention in tumor diagnosis and therapy. The simple and effective establishment of the theranostic nanoplatforms was still under urgent need. Meanwhile, the targeting ability and morphology of nanoprobe were essential for the effective endocytosis, which could further affect the diagnosis. In this work, two morphologies of nanoprobes were fabricated using gold nanorods (AuNRs) and gold nanospheres (AuNSs). Thiolated-hyaluronic acid labeled with nile blue (HS-HA-NB), a near-infrared (NIR) fluorescence dye, was coated on the surface of the gold nanoparticles to form stable nanoprobes (AuNR@HS-HA-NB, AuNS@HS-HA-NB)...
March 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28333924/csl-encodes-a-leucine-rich-repeat-protein-implicated-in-red-violet-light-signaling-to-the-circadian-clock-in-chlamydomonas
#3
Ayumi Kinoshita, Yoshimi Niwa, Kiyoshi Onai, Takashi Yamano, Hideya Fukuzawa, Masahiro Ishiura, Takuya Matsuo
The green alga Chlamydomonas reinhardtii shows various light responses in behavior and physiology. One such photoresponse is the circadian clock, which can be reset by external light signals to entrain its oscillation to daily environmental cycles. In a previous report, we suggested that a light-induced degradation of the clock protein ROC15 is a trigger to reset the circadian clock in Chlamydomonas. However, light signaling pathways of this process remained unclear. Here, we screened for mutants that show abnormal ROC15 diurnal rhythms, including the light-induced protein degradation at dawn, using a luciferase fusion reporter...
March 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28332565/corrigendum-ocular-exposure-to-blue-enriched-light-has-an-asymmetric-influence-on-neural-activity-and-spatial-attention
#4
Daniel P Newman, Steven W Lockley, Gerard M Loughnane, Ana Carina P Martins, Rafael Abe, Marco T R Zoratti, Simon P Kelly, Megan H O'Neill, Shantha M W Rajaratnam, Redmond G O'Connell, Mark A Bellgrove
No abstract text is available yet for this article.
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332395/electrolyte-gated-red-green-and-blue-organic-light-emitting-diodes
#5
Jiang Liu, Dustin Yuan Chen, Xinning Luan, Kwing Tong, Fangchao Zhao, Chao Liu, Qibing Pei, Huaping Li
We report vertical, electrolyte-gated, red, green and blue phosphorescent small molecule organic light emitting diodes (OLED), in which light emission was modified by tuning the electron injection via electrochemical doping of the electron injection layer 4,4-bis(N-carbazolyl)-1,1-biphenyl (CBP) under the assistance of a polymer electrolyte. These devices comprise an electrolyte capacitor on top of a conventional OLED, with the interfacial contact between the electrolyte and electron injection layer CBP of OLEDs achieved through a porous cathode...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332311/characterization-of-blue-light-irradiation-effects-on-pathogenic-and-nonpathogenic-escherichia-coli
#6
Courtney M Abana, John R Brannon, Rebecca A Ebbott, Taryn L Dunigan, Kirsten R Guckes, Hubaida Fuseini, Jennifer Powers, Bridget R Rogers, Maria Hadjifrangiskou
Blue light irradiation (BLI) is an FDA-approved method for treating certain types of infections, like acne, and is becoming increasingly attractive as an antimicrobial strategy as the prevalence of antibiotic-resistant "superbugs" rises. However, no study has delineated the effectiveness of BLI throughout different bacterial growth phases, especially in more BLI-tolerant organisms such as Escherichia coli. While the vast majority of E. coli strains are nonpathogenic, several E. coli pathotypes exist that cause infection within and outside the gastrointestinal tract...
March 22, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28332207/the-eyes-and-vision-of-butterflies
#7
Kentaro Arikawa
Butterflies use colour vision when searching for flowers. Unlike the trichromatic retinas of humans (blue, green, and red cones; plus rods) and honeybees (ultraviolet, blue, and green photoreceptors), butterfly retinas typically have six or more photoreceptor classes with distinct spectral sensitivities. The eyes of the Japanese yellow swallowtail (Papilio xuthus) contain ultraviolet, violet, blue, green, red and broad-band receptors, with each ommatidium housing nine photoreceptor cells in one of three fixed combinations...
March 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28331379/smartphone-viewing-distance-and-sleep-an-experimental-study-utilizing-motion-capture-technology
#8
Michitaka Yoshimura, Momoko Kitazawa, Yasuhiro Maeda, Masaru Mimura, Kazuo Tsubota, Taishiro Kishimoto
There are studies reporting the negative impact of smartphone utilization on sleep. It is considered that reduction of melatonin secretion under the blue light exposure from smart-phone displays is one of the causes. The viewing distance may cause sleep disturbance, because the viewing distance determines the screen illuminance and/or asthenopia. However, to date, there has been no study closely investigating the impact of viewing distance on sleep; therefore, we sought to determine the relationship between smartphone viewing distance and subjective sleep status...
2017: Nature and Science of Sleep
https://www.readbyqxmd.com/read/28331281/the-involvement-of-atf4-and-s-opsin-in-retinal-photoreceptor-cell-damage-induced-by-blue-led-light
#9
Emi Ooe, Kazuhiro Tsuruma, Yoshiki Kuse, Saori Kobayashi, Masamitsu Shimazawa, Hideaki Hara
PURPOSE: Blue light is a high-energy emitting light with a short wavelength in the visible light spectrum. Blue light induces photoreceptor apoptosis and causes age-related macular degeneration or retinitis pigmentosa. In the present study, we investigated the roles of endoplasmic reticulum (ER) stress induced by blue light-emitting diode (LED) light exposure in murine photoreceptor cells. METHODS: The murine photoreceptor cell line was incubated and exposed to blue LED light (464 nm blue LED light, 450 lx, 3 to 24 h)...
2017: Molecular Vision
https://www.readbyqxmd.com/read/28331198/remote-control-of-glucose-homeostasis-in-vivo-using-photopharmacology
#10
Zenobia B Mehta, Natalie R Johnston, Marie-Sophie Nguyen-Tu, Johannes Broichhagen, Peter Schultz, Dean P Larner, Isabelle Leclerc, Dirk Trauner, Guy A Rutter, David J Hodson
Photopharmacology describes the use of light to precisely deliver drug activity in space and time. Such approaches promise to improve drug specificity by reducing off-target effects. As a proof-of-concept, we have subjected the fourth generation photoswitchable sulfonylurea JB253 to comprehensive toxicology assessment, including mutagenicity and maximum/repeated tolerated dose studies, as well as in vivo testing in rodents. Here, we show that JB253 is well-tolerated with minimal mutagenicity and can be used to optically-control glucose homeostasis in anesthetized mice following delivery of blue light to the pancreas...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28330935/the-role-of-enhanced-responses-to-aba1-era1-in-arabidopsis-stomatal-responses-is-beyond-aba-signaling
#11
Pirko Jalakas, Yi-Chun Huang, Yu-Hung Yeh, Laurent Zimmerli, Ebe Merilo, Hannes Kollist, Mikael Brosche
Proper stomatal responses are essential for plant function in an altered environment. The core signaling pathway for abscisic acid (ABA)-induced stomatal closure involves perception of the hormone that leads to the activation of guard cell anion channels by the protein kinase OPEN STOMATA1 (OST1). Several other regulators are suggested to modulate the ABA signaling pathway, including the protein ENHANCED RESPONSE TO ABA 1 (ERA1), that encodes the farnesyl transferase beta subunit. The era1 mutant is hypersensitive to ABA during seed germination and shows a more closed stomata phenotype...
March 22, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28328226/non-enzymatic-glucose-sensor-based-on-au-zno-core-shell-nanostructures-decorated-with-au-nanoparticles-and-enhanced-with-blue-and-green-light
#12
Cheng-Liang Hsu, Yu-Jui Fang, Ting-Jen Hsueh, Sin-Hui Wang, Shoou-Jinn Chang
Au/ZnO core-shell nanostructures decorated with Au nanoparticles were synthesized on ITO/glass substrate. The investigated sensor contains 2-D, 1-D, and 0-D nanostructures to provide a large surface-area-to-volume ratio, the catalytic quantum effect and avoid the issues inherent in heterojunction interface barriers. The sensitivities of the fabricated glucose sensors in the dark, and under blue and green LED illumination were 3371.9, 4410.9, and 4157.8 μA/cm2mM-1, respectively. The achieved sensitivities are higher than previous reports on Au nanostructure sensors by 2~100 times...
March 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28327463/optical-thickness-identification-of-transition-metal-dichalcogenide-nanosheets-on-transparent-substrates
#13
Hao Zhang, Feirong Ran, Xiaotong Shi, Xiangru Fang, Shiyu Wu, Yue Liu, Xianqiang Zheng, Peng Yang, Yang Liu, Lin Wang, Xiao Huang, Hai Li, Wei Huang
Transparent and flexible devices based on two-dimensional (2D) materials hold great potential for many electronic/optoelectronic applications. The direct and fast thickness identification of 2D materials on transparent substrates is therefore an essential step in such applications, but remains challenging. Here, we present a simple, rapid and reliable optical method to identify the thickness of 2D nanosheets on transparent substrates, such as polydimethylsiloxane, glass, and coverslip. Under reflection and transmission light, 1-20L MoS2 and 1-14L WSe2 nanosheets can be reliably identified by measuring the optical contrast difference between the 2D nanosheets and substrates in color, red, green or blue channels...
March 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28326852/sleep-outcomes-following-sleep-hygiene-related-interventions-for-individuals-with-traumatic-brain-injury-a-systematic-review
#14
Stefan Bogdanov, Sharon Naismith, Suncica Lah
BACKGROUND: Sleep disturbance is commonly reported following traumatic brain injury (TBI) and can adversely impact health and wellbeing and interfere with the rehabilitation process. As such, effective treatment of sleep disturbance is critical for overall recovery. Sleep hygiene, which is non-invasive, low cost, and low risk, could serve as a suitable first line of treatment for individuals experiencing sleep disturbance post-TBI. OBJECTIVE: To assess the efficacy of sleep hygiene on sleep outcomes post-TBI...
March 22, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28325941/blue-organic-light-emitting-diodes-realizing-external-quantum-efficiency-over-25-using-thermally-activated-delayed-fluorescence-emitters
#15
Takuya Miwa, Shosei Kubo, Katsuyuki Shizu, Takeshi Komino, Chihaya Adachi, Hironori Kaji
Improving the performance of blue organic light-emitting diodes (OLEDs) is needed for full-colour flat-panel displays and solid-state lighting sources. The use of thermally activated delayed fluorescence (TADF) is a promising approach to efficient blue electroluminescence. However, the difficulty of developing efficient blue TADF emitters lies in finding a molecular structure that simultaneously incorporates (i) a small energy difference between the lowest excited singlet state (S1) and the lowest triplet state (T1), ΔE ST, (ii) a large oscillator strength, f, between S1 and the ground state (S0), and (iii) S1 energy sufficiently high for blue emission...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28325907/photosensitization-of-tio2-nanofibers-by-ag2s-with-the-synergistic-effect-of-excess-surface-ti-3-states-for-enhanced-photocatalytic-activity-under-simulated-sunlight
#16
Samina Ghafoor, Sadia Ata, Nasir Mahmood, Salman Noshear Arshad
TiO2 nanofibers, with mean diameter ~200 nm, were fabricated by electrospinning and successfully photosensitized with low bandgap Ag2S nanoparticles of 11, 17, 23 and 40 nm mean sizes, with corresponding loading of 4, 10, 18 and 29 wt.% Ag2S, respectively. 17 nm Ag2S@TiO2 nanofibers exhibited optimal activity in the photodegradation of methylene blue under simulated sunlight with pseudo-first order rate constant of 0.019 min(-1) compared to 0.009 min(-1) for pure TiO2 nanofibers. In spite of greater visible-light absorption and reduced bandgap, larger than 17 nm Ag2S nanoparticles exhibited sluggish photodegradation kinetics probably due to less photo-induced carriers generation in TiO2 and reduced electron injection rates from the larger sized Ag2S into TiO2...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28325790/dopamine-terminals-from-the-ventral-tegmental-area-gate-intrinsic-inhibition-in-the-prefrontal-cortex
#17
William C Buchta, Stephen V Mahler, Benjamin Harlan, Gary S Aston-Jones, Arthur C Riegel
Spike frequency adaptation (SFA or accommodation) and calcium-activated potassium channels that underlie after-hyperpolarization potentials (AHP) regulate repetitive firing of neurons. Precisely how neuromodulators such as dopamine from the ventral tegmental area (VTA) regulate SFA and AHP (together referred to as intrinsic inhibition) in the prefrontal cortex (PFC) remains unclear. Using whole cell electrophysiology, we measured intrinsic inhibition in prelimbic (PL) layer 5 pyramidal cells of male adult rats...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28325764/the-vitamin-b12-dependent-photoreceptor-aerr-relieves-photosystem-gene-repression-by-extending-the-interaction-of-crtj-with-photosystem-promoters
#18
Mingxu Fang, Carl E Bauer
Purple nonsulfur bacteria adapt their physiology to a wide variety of environmental conditions often through the control of transcription. One of the main transcription factors involved in controlling expression of the Rhodobacter capsulatus photosystem is CrtJ, which functions as an aerobic repressor of photosystem genes. Recently, we reported that a vitamin B12 binding antirepressor of CrtJ called AerR is required for anaerobic expression of the photosystem. However, the mechanism whereby AerR regulates CrtJ activity is unclear...
March 21, 2017: MBio
https://www.readbyqxmd.com/read/28324936/a-preliminary-study-on-multi-wavelength-ppg-based-pulse-transit-time-detection-for-cuffless-blood-pressure-measurement
#19
Jing Liu, Yuan-Ting Zhang, Xiao-Rong Ding, Wen-Xuan Dai, Ni Zhao
Pulse transit time (PTT) has been widely studied as an index of blood pressure (BP) changes. In recent years, some prototypes of PTT-based wearable BP measurement devices have been developed, which can relieve users from the discomfort caused by the inflating cuff used in auscultatory and oscillometric BP measurement techniques. However, in the common practice for PTT detection, multi-site sensor implementation on human body is required, making it difficult for the integration of wearable devices. Since multi-wavelength (MW) photoplethysmogram (PPG) signals carry blood pulsation information of different blood vessels embedded in different skin depths, the time difference between different wavelength PPG signals collected at the same body site can be treated as a special PTT on a short length of blood vessels beneath the skin...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324762/chrysanthemum-morphology-photosynthetic-efficiency-and-antioxidant-capacity-are-differentially-modified-by-light-quality
#20
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
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