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https://www.readbyqxmd.com/read/28749592/porphyrin-antennas-on-carbon-nanodots-excited-state-energy-and-electron-transduction
#1
Maurizio Prato, Francesca Arcudi, Volker Strauss, Luka Dordevic, Alejandro Cadranel, Dirk Guldi
We report the synthesis and electron donor-acceptor features of a novel nano-hybrid, in which the light harvesting and electron donating properties of a meso-tetraarylporphyrin (TArP) are combined with the electron accepting features of Nitrogen-Doped Carbon Nanodots (NCNDs). In particular, in a ultrafast process (> 1012 s-1), visible light excitation transforms the strongly quenched porphyrin singlet excited states into 225 ps lived charge separated states. On the other hand, ultraviolet light excitation triggers a non-resolvable transduction of singlet excited state energy from the NCNDs to the porphyrins, followed by the same charge separation observed upon visible light excitation...
July 27, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28749359/systolic-time-interval-estimation-using-continuous-wave-radar-with-on-body-antennas
#2
Dilpreet Buxi, Evelien Hermeling, Marco Mercuri, Fabian Beutel, Roberto Garcia van der Westen, Tom Torfs, Jean-Michel Redoute, Mehmet Rasit Yuce
The estimation of systolic time interval (STI)s is done using continuous wave (CW) radar at 2.45GHz with an on-body antenna. MOTIVATION: In the state of the art, typically bioimpedance, heart sounds and / or ultrasound is used to measure STIs. All three methods suffer from insufficient accuracy of STI estimation due to various reasons. CW radar is investigated for its ability to overcome the deficiencies in the state of the art. METHODS: Ten healthy male subjects aged 25-45 were asked to lie down at a 30 degree incline...
July 25, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28749146/rigid-dendritic-shaped-porphyrin-antennas-controlling-cas-cades-of-unidirectional-energy-funneling-and-charge-trans-fer
#3
Maximilian Wolf, Astrid Herrmann, Andreas Hirsch, Dirk M Guldi
Porphyrin arrays, which consist of three peripheral ZnPs and a central H2P - all rigidly linked to each other -serve as light harvesting antennas as well as electron donors and are flexibly coupled to an electron accepting C60 to realize the unidirectional flow of i) excited state energy from the ZnPs at the periphery to the H2P, ii) electrons to C60, and iii) holes to H2P and, subsequently, to ZnP. Dynamics following photoexcitation are elucidated by time resolved transient absorption measurements on the femto-, pico, nano-, and microsecond time scales and are examined by multiwavelength as well as target analyses...
July 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28748006/-effectiveness-of-vaccine-management-and-quality-of-immunization-services-in-the-expanded-programme-on-immunization-epi-antenna-in-the-kisangani-region-democratic-republic-of-congo
#4
Matthieu Betofe Labama, Eugène Basandja Longembe, Joris Losimba Likwela
INTRODUCTION: The quality of vaccines is critical for good immunization outcomes. It is dependent on the effectiveness of technical and logistics management system put in place. This study aimed to assess the effectiveness of vaccine management and to learn something from this. METHODS: We conducted a retrospective study of logistic management of vaccines in the Expanded Programme on Immunization (EPI) antenna in the Kisangani region over the period 2010-2014. A literature review completed by semi-structured interviews of immunization services managers and providers helped to evaluate vaccine management using the WHO GEV model in order to identify the gaps...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28747471/co-option-of-a-motor-to-sensory-histaminergic-circuit-correlates-with-insect-flight-biomechanics
#5
Phillip D Chapman, Samual P Bradley, Erica J Haught, Kassandra E Riggs, Mouaz M Haffar, Kevin C Daly, Andrew M Dacks
Nervous systems must adapt to shifts in behavioural ecology. One form of adaptation is neural exaptation, in which neural circuits are co-opted to perform additional novel functions. Here, we describe the co-option of a motor-to-somatosensory circuit into an olfactory network. Many moths beat their wings during odour-tracking, whether walking or flying, causing strong oscillations of airflow around the antennae, altering odour plume structure. This self-induced sensory stimulation could impose selective pressures that influence neural circuit evolution, specifically fostering the emergence of corollary discharge circuits...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28745638/localization-of-odorant-receptor-genes-in-locust-antennae-by-rna-in-situ-hybridization
#6
Xiao Xu, Yinwei You, Long Zhang
Insects have evolved sophisticated olfactory reception systems to sense exogenous chemical signals. These chemical signals are transduced by Olfactory Receptor Neurons (ORNs) housed in hair-like structures, called chemosensilla, of the antennae. On the ORNs' membranes, Odorant Receptors (ORs) are believed to be involved in odor coding. Thus, being able to identify genes localized to the ORNs is necessary to recognize OR genes, and provides a fundamental basis for further functional in situ studies. The RNA expression levels of specific ORs in insect antennae are very low, and preserving insect tissue for histology is challenging...
July 13, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28745059/an-nir-neodymium-tag-for-quantifying-targeted-biomarker-and-counting-its-host-circulating-tumor-cells
#7
Chunlan Liu, Shu Lu, Limin Yang, Peijie Chen, Peiming Bai, Qiuquan Wang
Quantitative information of targeted analyte in a complex biological system is the most basic premise for understanding its involved mechanisms, and thus precise diagnosis of a disease if it is a so-called biomarker. Here, we designed and synthesized a neodymium (Nd)-cored tag [1,4,7,10-tetraazacyclododecane-1,4,7-trisacetic acid (DOTA)-Nd complex together with a light-harvesting antenna aminofluorescein (AMF, λex/em = 494/520 nm), AMF-DOTA-Nd] with duplex signals, second near-infrared (NIR) window luminescence (λem = 1065 nm, 2...
July 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28740235/dendritic-optical-antennas-scattering-properties-and-fluorescence-enhancement
#8
Ke Guo, Alessandro Antoncecchi, Xuezhi Zheng, Mai Sallam, Ezzeldin A Soliman, Guy A E Vandenbosch, Victor V Moshchalkov, A Femius Koenderink
With the development of nanotechnologies, researchers have brought the concept of antenna to the optical regime for manipulation of nano-scaled light matter interactions. Most optical nanoantennas optimize optical function, but are not electrically connected. In order to realize functions that require electrical addressing, optical nanoantennas that are electrically continuous are desirable. In this article, we study the optical response of a type of electrically connected nanoantennas, which we propose to call "dendritic" antennas...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28737382/solid-state-plasmonic-solar-cells
#9
Kosei Ueno, Tomoya Oshikiri, Quan Sun, Xu Shi, Hiroaki Misawa
Metallic nanoparticles such as silver and gold show localized surface plasmon resonances (LSPRs), which are associated with near-field enhancement effects in the vicinity of nanoparticles. Therefore, strong light-matter interaction is induced by the near-field enhancement effects of LSPRs. Because the resonant wavelength of LSPRs can be easily controlled by the size and shape of the metallic nanoparticles in the visible and near-infrared wavelength range, LSPRs have received considerable attention as optical antennae for light energy conversion systems such as solar cells...
July 24, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28737037/polyimide-aerogels-using-tri-isocyanate-as-cross-linker
#10
Baochau N Nguyen, Mary Ann Babin Meador, Daniel A Scheiman, Linda S McCorkle
Cross-linked polyimide (PI) aerogels are highly porous, lightweight materials with low thermal conductivity and low dielectric constant. Depending on the backbone chemistry, the cross-linked polyimide aerogels can be molded into various size and shape or cast into flexible, thin film. They are excellent candidates for many applications including antenna-based substrate, thermal insulation for space suits or inflatable structures for entry, descent and landing, or industrial pipelines, protective clothing or building and construction...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28736530/identification-and-expression-profiling-of-chemosensory-genes-in-dendrolimus-punctatus-walker
#11
Su-Fang Zhang, Hui-Hui Liu, Xiang-Bo Kong, Hong-Bin Wang, Fu Liu, Zhen Zhang
Dendrolimus punctatus Walker is a serious pest affecting conifers in southern China. As extensive pesticide spraying is currently required to control D. punctatus, new control strategies are urgently needed. Chemosensory genes represent potential molecular targets for development of alternative pest control strategies, and the expression characteristics of these genes provide an indication of their function. To date, little information is available regarding chemosensory genes in D. punctatus or their expression profiles at different development stages and in various tissues...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28736172/early-integration-of-temperature-and-humidity-stimuli-in-the-drosophila-brain
#12
Dominic D Frank, Anders Enjin, Genevieve C Jouandet, Emanuela E Zaharieva, Alessia Para, Marcus C Stensmyr, Marco Gallio
The Drosophila antenna contains receptor neurons for mechanical, olfactory, thermal, and humidity stimuli. Neurons expressing the ionotropic receptor IR40a have been implicated in the selection of an appropriate humidity range [1, 2], but although previous work indicates that insect hygroreceptors may be made up by a "triad" of neurons (with a dry-, a cold-, and a humid-air-responding cell [3]), IR40a expression included only cold- and dry-air cells. Here, we report the identification of the humid-responding neuron that completes the hygrosensory triad in the Drosophila antenna...
July 13, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28734933/photosystem-ii-cyclic-electron-flow-powers-exceptional-photoprotection-and-record-growth-in-the-microalga-chlorella-ohadii
#13
Gennady Ananyev, Colin Gates, Aaron Kaplan, G Charles Dismukes
The desert microalga Chlorella ohadii was reported to grow at extreme light intensities with minimal photoinhibition, tolerate frequent de/re-hydrations, yet minimally employs antenna-based non-photochemical quenching for photoprotection. Here we investigate the molecular mechanisms by measuring Photosystem II charge separation yield (chlorophyll variable fluorescence, Fv/Fm) and flash-induced O2 yield to measure the contributions from both linear (PSII-LEF) and cyclic (PSII-CEF) electron flow within PSII. Cells grow increasingly faster at higher light intensities (μE/m(2)/s) from low (20) to high (200) to extreme (2000) by escalating photoprotection via shifting from PSII-LEF to PSII-CEF...
July 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28732060/formation-of-singlet-oxygen-by-decomposition-of-protein-hydroperoxide-in-photosystem-ii
#14
Vinay Pathak, Ankush Prasad, Pavel Pospíšil
Singlet oxygen (1O2) is formed by triplet-triplet energy transfer from triplet chlorophyll to O2 via Type II photosensitization reaction in photosystem II (PSII). Formation of triplet chlorophyll is associated with the change in spin state of the excited electron and recombination of triplet radical pair in the PSII antenna complex and reaction center, respectively. Here, we have provided evidence for the formation of 1O2 by decomposition of protein hydroperoxide in PSII membranes deprived of Mn4O5Ca complex...
2017: PloS One
https://www.readbyqxmd.com/read/28732030/identification-of-odorant-binding-proteins-and-chemosensory-proteins-in-microplitis-mediator-as-well-as-functional-characterization-of-chemosensory-protein-3
#15
Yong Peng, Shan-Ning Wang, Ke-Ming Li, Jing-Tao Liu, Yao Zheng, Shuang Shan, Ye-Qing Yang, Rui-Jun Li, Yong-Jun Zhang, Yu-Yuan Guo
Odorant binding proteins (OBPs) and chemosensory proteins (CSPs) play important roles in transporting semiochemicals through the sensillar lymph to olfactory receptors in insect antennae. In the present study, twenty OBPs and three CSPs were identified from the antennal transcriptome of Microplitis mediator. Ten OBPs (MmedOBP11-20) and two CSPs (MmedCSP2-3) were newly identified. The expression patterns of these new genes in olfactory and non-olfactory tissues were investigated by real-time quantitative PCR (qPCR) measurement...
2017: PloS One
https://www.readbyqxmd.com/read/28732011/proteomics-analysis-reveals-a-dynamic-diurnal-pattern-of-photosynthesis-related-pathways-in-maize-leaves
#16
Dan Feng, Yanwei Wang, Tiegang Lu, Zhiguo Zhang, Xiao Han
Plant leaves exhibit differentiated patterns of photosynthesis rates under diurnal light regulation. Maize leaves show a single-peak pattern without photoinhibition at midday when the light intensity is maximized. This mechanism contributes to highly efficient photosynthesis in maize leaves. To understand the molecular basis of this process, an isobaric tag for relative and absolute quantitation (iTRAQ)-based proteomics analysis was performed to reveal the dynamic pattern of proteins related to photosynthetic reactions...
2017: PloS One
https://www.readbyqxmd.com/read/28731722/dynamically-reconfigurable-metadevice-employing-nanostructured-phase-change-materials
#17
Zhihua Zhu, Philip Gareth Evans, Richard F Haglund, Jason Valentine
Mastering dynamic free-space spectral control and modulation in the near-infrared and optical regimes remains a challenging task that is hindered by the available functional materials at high frequencies. Here, we realize an efficient metadevice capable of spectral control by minimizing the thermal mass of a vanadium dioxide phase-change material (PCM) and placing the PCM at the feed gap of a bow-tie field antenna. The device has an experimentally measured tuning range up to 360 nm in the NIR and a modulation depth of 33% at the resonant wavelength...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28730637/identification-and-functional-characterization-of-an-odorant-receptor-in-pea-aphid-acyrthosiphon-pisum
#18
Rui-Bin Zhang, Yang Liu, Shan-Chun Yan, Gui-Rong Wang
The sensitive olfactory system is necessary for survival of insects. Odorant receptors (ORs) are located on the dendrites of olfactory receptor neurons and play a critical role in odor detection. Insect ORs are functionally analyzed via heterologous expression in a Xenopus oocyte system using a two-electrode voltage-clamp (TEVC) electrophysiological recording. Here, we have identified a novel OR in the pea aphid, Acyrthosiphon pisum, then we cloned and named it ApisOR4. We analyzed the ApisOR4 tissue expression patterns and found expression only in antennae tissues...
July 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28729645/nano-antenna-enhanced-two-focus-fluorescence-correlation-spectroscopy
#19
Lutz Langguth, Agata Szuba, Sander A Mann, Erik C Garnett, Gijsje H Koenderink, A Femius Koenderink
We propose two-focus fluorescence correlation spectroscopy (2fFCS) on basis of plasmonic nanoantennas that provide distinct hot spots that are individually addressable through polarization, yet lie within a single diffraction limited microscope focus. The importance of two-focus FCS is that a calibrated distance between foci provides an intrinsic calibration to derive diffusion constants from measured correlation times. Through electromagnetic modelling we analyze a geometry of perpendicular nanorods, and their inverse, i...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728442/an-integrated-platform-for-small-animal-hyperthermia-investigations-under-ultra-high-field-mri-guidance
#20
Sergio Curto, Pegah Faridi, Tej B Shrestha, Marla Pyle, Leila Maurmann, Deryl Troyer, Stefan H Bossmann, Punit Prakash
PURPOSE: Integrating small-animal experimental hyperthermia instrumentation with magnetic resonance imaging (MRI) affords real-time monitoring of spatial temperature profiles. This study reports on the development and preliminary in vivo characterisation of a 2.45 GHz microwave hyperthermia system for pre-clinical small animal investigations, integrated within a 14 T ultra-high-field MRI scanner. MATERIALS AND METHODS: The presented system incorporates a 3.5 mm (OD) directional microwave hyperthermia antenna, positioned adjacent to the small-animal target, radiating microwave energy for localised heating of subcutaneous tumours...
July 21, 2017: International Journal of Hyperthermia
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