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https://www.readbyqxmd.com/read/28646225/a-high-power-broadband-terahertz-source-enabled-by-three-dimensional-light-confinement-in-a-plasmonic-nanocavity
#1
Nezih Tolga Yardimci, Semih Cakmakyapan, Soroosh Hemmati, Mona Jarrahi
The scope and potential uses of time-domain terahertz imaging and spectroscopy are mainly limited by the low optical-to-terahertz conversion efficiency of photoconductive terahertz sources. State-of-the-art photoconductive sources utilize short-carrier-lifetime semiconductors to recombine carriers that cannot contribute to efficient terahertz generation and cause additional thermal dissipation. Here, we present a novel photoconductive terahertz source that offers a significantly higher efficiency compared with terahertz sources fabricated on short-carrier-lifetime substrates...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28644493/photoelectrochemical-devices-for-solar-water-splitting-materials-and-challenges
#2
Chaoran Jiang, Savio J A Moniz, Aiqin Wang, Tao Zhang, Junwang Tang
It is widely accepted within the community that to achieve a sustainable society with an energy mix primarily based on solar energy we need an efficient strategy to convert and store sunlight into chemical fuels. A photoelectrochemical (PEC) device would therefore play a key role in offering the possibility of carbon-neutral solar fuel production through artificial photosynthesis. The past five years have seen a surge in the development of promising semiconductor materials. In addition, low-cost earth-abundant co-catalysts are ubiquitous in their employment in water splitting cells due to the sluggish kinetics of the oxygen evolution reaction (OER)...
June 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28643176/a-promising-tool-in-retina-regeneration-current-perspectives-and-challenges-when-using-mesenchymal-progenitor-stem-cells-in-veterinary-and-human-ophthalmological-applications
#3
REVIEW
Anna Cislo-Pakuluk, Krzysztof Marycz
Visual impairment is a common ailment of the current world population, with more exposure to CCD screens and fluorescent lighting, approximately 285 billion people suffer from this deficiency and 13% of those are considered clinically blind. More common causes for visual impairment include age-related macular degeneration (AMD), glaucoma and diabetic retinopathy (Zhu et al. Molecular Medicine Reports, 2015; Kolb et al. 2007; Machalińska et al. Current Eye Research, 34(9),748-760, 2009) among a few. As cases of retinal and optic nerve diseases rise, it is vital to find a treatment, which has led to investigation of the therapeutic potential of various stem cells types (Bull et al...
June 22, 2017: Stem Cell Reviews
https://www.readbyqxmd.com/read/28638388/using-in-situ-symbiotic-seed-germination-to-restore-over-collected-medicinal-orchids-in-southwest-china
#4
Shi-Cheng Shao, Kevin S Burgess, Jennifer M Cruse-Sanders, Qiang Liu, Xu-Li Fan, Hui Huang, Jiang-Yun Gao
Due to increasing demand for medicinal and horticultural uses, the Orchidaceae is in urgent need of innovative and novel propagation techniques that address both market demand and conservation. Traditionally, restoration techniques have been centered on ex situ asymbiotic or symbiotic seed germination techniques that are not cost-effective, have limited genetic potential and often result in low survival rates in the field. Here, we propose a novel in situ advanced restoration-friendly program for the endangered epiphytic orchid species Dendrobium devonianum, in which a series of in situ symbiotic seed germination trials base on conspecific fungal isolates were conducted at two sites in Yunnan Province, China...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28633528/the-binding-space-concept-a-new-approach-to-enhance-the-reliability-of-docking-scores-and-its-application-to-predicting-butyrylcholinesterase-bche-hydrolytic-activity
#5
Giulio Vistoli, Angelica Mazzolari, Bernard Testa, Alessandro Pedretti
Docking simulations are very popular approaches able to assess the capacity of a given ligand to interact with a target. Docking simulations are usually focused on a single best complex even though many studies showed that ligands retain a significant mobility within a binding pocket by assuming different binding modes all of which may contribute to the monitored ligand affinity. The present study describes an innovative concept, the binding space, which allows an exploration of the ligand mobility within the binding pocket by simultaneously considering several ligand poses as generated by docking simulations...
June 20, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28631933/a-salt-reduction-smartphone-app-supports-lower-salt-food-purchases-for-people-with-cardiovascular-disease-findings-from-the-saltswitch-randomised-controlled-trial
#6
Helen Eyles, Rebecca McLean, Bruce Neal, Yannan Jiang, Robert N Doughty, Rachael McLean, Cliona Ni Mhurchu
Background SaltSwitch is an innovative smartphone application (app) that enables shoppers to scan the barcode of a packaged food and receive an immediate, interpretive, traffic light nutrition label on the screen, along with suggestions for lower salt alternatives. Our aim was to determine the effectiveness of SaltSwitch to support people with cardiovascular disease to make lower salt food choices. Design Six-week, two-arm, parallel, randomised controlled trial in Auckland, New Zealand (2 weeks baseline and 4 weeks intervention)...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28630913/an-innovative-biologic-system-for-photon-powered-myocardium-in-the-ischemic-heart
#7
Jeffrey E Cohen, Andrew B Goldstone, Michael J Paulsen, Yasuhiro Shudo, Amanda N Steele, Bryan B Edwards, Jay B Patel, John W MacArthur, Michael S Hopkins, Casey E Burnett, Kevin J Jaatinen, Akshara D Thakore, Justin M Farry, Vi N Truong, Alexandra T Bourdillon, Lyndsay M Stapleton, Anahita Eskandari, Alexander S Fairman, William Hiesinger, Tatiana V Esipova, William L Patrick, Keven Ji, Judith A Shizuru, Y Joseph Woo
Coronary artery disease is one of the most common causes of death and disability, afflicting more than 15 million Americans. Although pharmacological advances and revascularization techniques have decreased mortality, many survivors will eventually succumb to heart failure secondary to the residual microvascular perfusion deficit that remains after revascularization. We present a novel system that rescues the myocardium from acute ischemia, using photosynthesis through intramyocardial delivery of the cyanobacterium Synechococcus elongatus...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28628725/dendronized-semiconducting-polymer-as-photothermal-nanocarrier-for-remote-activation-of-gene-expression
#8
Yan Lyu, Dong Cui, He Sun, Yansong Miao, Hongwei Duan, Kanyi Pu
Regulation of transgene systems is imperative to develop innovative medicines. However, noninvasive remote control of gene expression has been rarely developed and remains elusive. We herein synthesize a near-infrared (NIR) absorbing dendronized semiconducting polymer (DSP) and utilize it as a photothermal nanocarrier not only to efficiently deliver genes but also to spatiotemporally control gene expression in conjunction with heat-inducible promoter. DSP has a high photothermal conversion efficiency (44.2%) at 808 nm, permitting fast transduction of NIR light into heat signals for intracellular activation of transcription...
June 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28627118/optical-microresonators-for-sensing-and-transduction-a-materials-perspective
#9
REVIEW
Kevin D Heylman, Kassandra A Knapper, Erik H Horak, Morgan T Rea, Sudheer K Vanga, Randall H Goldsmith
Optical microresonators confine light to a particular microscale trajectory, are exquisitely sensitive to their microenvironment, and offer convenient readout of their optical properties. Taken together, this is an immensely attractive combination that makes optical microresonators highly effective as sensors and transducers. Meanwhile, advances in material science, fabrication techniques, and photonic sensing strategies endow optical microresonators with new functionalities, unique transduction mechanisms, and in some cases, unparalleled sensitivities...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28619089/light-manipulation-of-mosquito-behaviour-acute-and-sustained-photic-suppression-of-biting-activity-in-the-anopheles-gambiae-malaria-mosquito
#10
Aaron D Sheppard, Samuel S C Rund, Gary F George, Erin Clark, Dominic J Acri, Giles E Duffield
BACKGROUND: Host-seeking behaviours in anopheline mosquitoes are time-of-day specific, with a greater propensity for nocturnal biting. We investigated how a short exposure to light presented during the night or late day can inhibit biting activity and modulate flight activity behaviour. RESULTS: Anopheles gambiae (s.s.), maintained on a 12:12 LD cycle, were exposed transiently to white light for 10-min at the onset of night and the proportion taking a blood meal in a human biting assay was recorded every 2 h over an 8-h duration...
June 16, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28617604/directional-emission-from-dielectric-leaky-wave-nanoantennas
#11
Manuel Peter, Andre Hildebrandt, Christian Schlickriede, Kimia Gharib, Thomas Zentgraf, Jens Förstner, Stefan Linden
An important source of innovation in nanophotonics is the idea to scale down known radio wave technologies to the optical regime. One thoroughly investigated example of this approach are metallic nanoantennas which employ plasmonic resonances to couple localized emitters to selected far-field modes. While metals can be treated as perfect conductors in the microwave regime, their response becomes Drude-like at optical frequencies. Thus, plasmonic nanoantennas are inherently lossy. Moreover, their resonant nature requires precise control of the antenna geometry...
June 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28617006/ethnographic-case-study-of-a-community-day-center-for-asylum-seekers-as-early-stage-mental-health-intervention
#12
Liana E Chase, Cécile Rousseau
Clinical guidelines in refugee mental health increasingly advocate phased approaches to intervention that foreground the provision of pragmatic and social support in contexts of ongoing instability. However, the impact of such interventions has rarely been explored from the perspective of refugees themselves. We conducted ethnographic research on the experiences and perceptions of users of an intervention embodying this approach: a community Day Center for asylum seekers in Montreal. Data comprising 15 interviews and field notes from 50 participant observation visits were analyzed using an established theoretical framework to identify mechanisms supporting self-perceived wellbeing among users in the domains of safety, social networks, justice, identity/roles, and existential meaning...
June 15, 2017: American Journal of Orthopsychiatry
https://www.readbyqxmd.com/read/28609733/a-novel-approach-for-acid-mine-drainage-pollution-biomonitoring-using-rare-earth-elements-bioaccumulated-in-the-freshwater-clam-corbicula-fluminea
#13
Estefanía Bonnail, Rafael Pérez-López, Aguasanta M Sarmiento, José Miguel Nieto, T Ángel DelValls
Lanthanide series have been used as a record of the water-rock interaction and work as a tool for identifying impacts of acid mine drainage (lixiviate residue derived from sulphide oxidation). The application of North-American Shale Composite-normalized rare earth elements patterns to these minority elements allows determining the origin of the contamination. In the current study, geochemical patterns were applied to rare earth elements bioaccumulated in the soft tissue of the freshwater clam Corbicula fluminea after exposure to different acid mine drainage contaminated environments...
June 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28605195/flexible-and-lightweight-fuel-cell-with-high-specific-power-density
#14
Fandi Ning, Xudong He, Yangbin Shen, Hehua Jin, Qingwen Li, Da Li, Shuping Li, Yulu Zhan, Ying Du, Jingjing Jiang, Hui Yang, Xiaochun Zhou
Flexible devices have been attracting great attention recently due to their numerous advantages. But the energy densities of current energy sources are still not high enough to support flexible devices for a satisfactory length of time. Although proton exchange membrane fuel cells (PEMFCs) do have a high-energy density, traditional PEMFCs are usually too heavy, rigid, and bulky to be used in flexible devices. In this research, we successfully invented a light and flexible air-breathing PEMFC by using a new design of PEMFC and a flexible composite electrode...
June 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28597220/the-value-of-darkness-a-moral-framework-for-urban-nighttime-lighting
#15
Taylor Stone
The adverse effects of artificial nighttime lighting, known as light pollution, are emerging as an important environmental issue. To address these effects, current scientific research focuses mainly on identifying what is bad or undesirable about certain types and uses of lighting at night. This paper adopts a value-sensitive approach, focusing instead on what is good about darkness at night. In doing so, it offers a first comprehensive analysis of the environmental value of darkness at night from within applied ethics...
June 8, 2017: Science and Engineering Ethics
https://www.readbyqxmd.com/read/28595193/the-economic-consequences-of-acute-kidney-injury
#16
Samuel A Silver, Glenn M Chertow
Acute kidney injury (AKI) is an increasingly common condition associated with poor health outcomes. Combined with its rising incidence, AKI has emerged as a major public health concern with high human and financial costs. In England, the estimated inpatient costs related to AKI consume 1% of the National Health Service budget. In the United States, AKI is associated with an increase in hospitalization costs that range from $5.4 to $24.0 billion. The most expensive patients are those with AKI of sufficient severity to require dialysis, where cost increases relative to patients without AKI range from $11,016 to $42,077 per hospitalization...
June 9, 2017: Nephron
https://www.readbyqxmd.com/read/28594467/biochemical-characterization-of-lr769-a-new-recombinant-factor-viia-bypassing-agent-produced-in-the-milk-of-transgenic-rabbits
#17
G Chevreux, N Tilly, Y Leblanc, C Ramon, V Faid, M Martin, F Dhainaut, N Bihoreau
BACKGROUND: The bypassing agent factor VII (FVIIa) is a first-line therapy for the treatment of acute bleeding episodes in patients with haemophilia and high-titre inhibitors. FVIIa is a highly post-translationally modified protein that requires eukaryotic expression systems to produce a fully active molecule. A recombinant FVIIa was produced in the milk of transgenic rabbits to increase expression and provide an efficient, safe and affordable product after purification to homogeneity (LR769)...
June 8, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28590035/interindividual-epigenetic-variability-sound-or-noise
#18
REVIEW
J Ramón Tejedor, Mario F Fraga
Interindividual variability is an inherent characteristic of biological systems. Whereas the underlying molecular sources of interindividual variability remain poorly understood, recent work by Ecker et al. (Ecker S, Chen L, Pancaldi V, Bagger FO, et al. 2017. Genome Biol 18: 18.) sheds light on the characterization of this phenomenon in a complex biological scenario. By combining data from the BLUEPRINT Epigenome Project with a novel analytical approach, these authors were able to measure the degree of transcriptional and epigenetic variability across a wide panel of samples and types of immune cell...
June 7, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28587301/bridging-plant-and-human-radiation-response-and-dna-repair-through-an-in-silico-approach
#19
Zacharenia Nikitaki, Athanasia Pavlopoulou, Marcela Holá, Mattia Donà, Ioannis Michalopoulos, Alma Balestrazzi, Karel J Angelis, Alexandros G Georgakilas
The mechanisms of response to radiation exposure are conserved in plants and animals. The DNA damage response (DDR) pathways are the predominant molecular pathways activated upon exposure to radiation, both in plants and animals. The conserved features of DDR in plants and animals might facilitate interdisciplinary studies that cross traditional boundaries between animal and plant biology in order to expand the collection of biomarkers currently used for radiation exposure monitoring (REM) in environmental and biomedical settings...
June 6, 2017: Cancers
https://www.readbyqxmd.com/read/28579827/optogenetic-modulation-of-intracellular-signalling-and-transcription-focus-on-neuronal-plasticity
#20
REVIEW
Cyril Eleftheriou, Fabrizia Cesca, Luca Maragliano, Fabio Benfenati, Jose Fernando Maya-Vetencourt
Several fields in neuroscience have been revolutionized by the advent of optogenetics, a technique that offers the possibility to modulate neuronal physiology in response to light stimulation. This innovative and far-reaching tool provided unprecedented spatial and temporal resolution to explore the activity of neural circuits underlying cognition and behaviour. With an exponential growth in the discovery and synthesis of new photosensitive actuators capable of modulating neuronal networks function, other fields in biology are experiencing a similar re-evolution...
2017: Journal of Experimental Neuroscience
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