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https://www.readbyqxmd.com/read/28644874/position-and-orientation-inference-via-on-board-triangulation
#1
Madhu Advani, Daniel S Weile
This work proposes a new approach to determine the spatial location and orientation of an object using measurements performed on the object itself. The on-board triangulation algorithm we outline could be implemented in lieu of, or in addition to, well-known alternatives such as Global Positioning System (GPS) or standard triangulation, since both of these correspond to significantly different geometric pictures and necessitate different hardware and algorithms. We motivate the theory by describing situations in which on-board triangulation would be useful and even preferable to standard methods...
2017: PloS One
https://www.readbyqxmd.com/read/28644712/comparative-analysis-of-behavioral-and-transcriptional-variation-underlying-co2-sensory-neuron-function-and-development-in-drosophila
#2
Jia Wern Pan, Joi McLaughlin, Haining Yang, Charles Leo, Paula Rambarat, Sumie Okuwa, Anaïs Monroy-Eklund, Sabrina Clark, Corbin D Jones, Pelin Cayirlioglu Volkan
Carbon dioxide is an important environmental cue for many insects, regulating many behaviors including some that have direct human impacts. To further improve our understanding of how this system varies among closely related insect species, we examined both the behavioral response to CO2 as well as the transcriptional profile of key developmental regulators of CO2 sensory neurons in the olfactory system across the Drosophila genus. We found that CO2 generally evokes repulsive behavior across most of the Drosophilids we examined, but this behavior has been lost or reduced in several lineages...
June 23, 2017: Fly
https://www.readbyqxmd.com/read/28643169/in-vitro-enzymatic-assays-of-photosynthetic-bacterial-3-vinyl-hydratases-for-bacteriochlorophyll-biosyntheses
#3
Misato Teramura, Jiro Harada, Hitoshi Tamiaki
A chlorosome is a large and efficient light-harvesting antenna system found in some photosynthetic bacteria. This system comprises self-aggregates of bacteriochlorophyll (BChl) c, d, or e possessing a chiral 1-hydroxyethyl group at the 3-position, which plays a key role in the formation of the supramolecule. Biosynthesis of chlorosomal pigments involves stereoselective conversion of 3-vinyl group to 3-(1-hydroxyethyl) group facilitated by a 3-vinyl hydratase. This 3-vinyl hydration also occurs in BChl a biosynthesis, followed by oxidation that introduces an acetyl group at the 3-position...
June 22, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28643168/self-aggregation-of-synthetic-zinc-methyl-20-substituted-3-hydroxymethyl-pyropheophorbides-as-models-of-bacteriochlorophyll-c
#4
Ayaka Wada, Hitoshi Tamiaki
Zinc 3-hydroxymethyl-13(1)-oxo-chlorins bearing a variety of primary alkyl groups at the 20-position were prepared as models of bacteriochlorophyll-c by chemical modification of naturally occurring chlorophyll-a. The synthetic chlorophyll-a derivatives self-aggregated in an aqueous Triton X-100 solution to afford large oligomers whose Soret and Qy bands were red-shifted and broadened, compared with the bands of their monomers in tetrahydrofuran. The oligomeric bands are similar to those of bacteriochlorophyll-c self-aggregates in chlorosomes, the main light-harvesting antennae of photosynthetic green bacteria...
June 22, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28643084/influence-of-knockout-of-at4g20990-gene-encoding-%C3%AE-ca4-on-photosystem-ii-light-harvesting-antenna-in-plants-grown-under-different-light-intensities-and-day-lengths
#5
Natalia N Rudenko, Tatyana P Fedorchuk, Daria V Vetoshkina, Elena M Zhurikova, Lyudmila K Ignatova, Boris N Ivanov
Effect of knockout of the At4g20990 gene encoding α-carbonic anhydrase 4 (α-CA4) in Arabidopsis thaliana in plants grown in low light (LL, 80 μmol photons m(-2) s(-1)) or in high light (HL, 400 μmol photons m(-2) s(-1)) under long (LD, 16 h) or short (SD, 8 h) day length was studied. In α-CA4 knockout plants, under all studied conditions, the non-photochemical quenching was lower; the decrease was more pronounced under HL. This pointed to α-CA4 implication in the processes leading to energy dissipation in PSII antenna...
June 22, 2017: Protoplasma
https://www.readbyqxmd.com/read/28640198/experimental-investigation-of-magnetic-nanoparticle-enhanced-microwave-hyperthermia
#6
Brogan T McWilliams, Hongwang Wang, Valerie J Binns, Sergio Curto, Stefan H Bossmann, Punit Prakash
The objective of this study was to evaluate microwave heating enhancements offered by iron/iron oxide nanoparticles dispersed within tissue-mimicking media for improving efficacy of microwave thermal therapy. The following dopamine-coated magnetic nanoparticles (MNPs) were considered: 10 and 20 nm diameter spherical core/shell Fe/Fe₃O₄, 20 nm edge-length cubic Fe₃O₄, and 45 nm edge-length/10 nm height hexagonal Fe₃O₄. Microwave heating enhancements were experimentally measured with MNPs dissolved in an agar phantom, placed within a rectangular waveguide...
June 22, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/28640188/novel-concrete-temperature-monitoring-method-based-on-an-embedded-passive-rfid-sensor-tag
#7
Yongsheng Liu, Fangming Deng, Yigang He, Bing Li, Zhen Liang, Shuangxi Zhou
This paper firstly introduces the importance of temperature control in concrete measurement, then a passive radio frequency identification (RFID) sensor tag embedded for concrete temperature monitoring is presented. In order to reduce the influences of concrete electromagnetic parameters during the drying process, a T-type antenna is proposed to measure the concrete temperature at the required depth. The proposed RFID sensor tag is based on the EPC generation-2 ultra-high frequency (UHF) communication protocol and operates in passive mode...
June 22, 2017: Sensors
https://www.readbyqxmd.com/read/28638073/plasmon-induced-selective-carbon-dioxide-conversion-on-earth-abundant-aluminum-cuprous-oxide-antenna-reactor-nanoparticles
#8
Hossein Robatjazi, Hangqi Zhao, Dayne F Swearer, Nathaniel J Hogan, Linan Zhou, Alessandro Alabastri, Michael J McClain, Peter Nordlander, Naomi J Halas
The rational combination of plasmonic nanoantennas with active transition metal-based catalysts, known as 'antenna-reactor' nanostructures, holds promise to expand the scope of chemical reactions possible with plasmonic photocatalysis. Here, we report earth-abundant embedded aluminum in cuprous oxide antenna-reactor heterostructures that operate more effectively and selectively for the reverse water-gas shift reaction under milder illumination than in conventional thermal conditions. Through rigorous comparison of the spatial temperature profile, optical absorption, and integrated electric field enhancement of the catalyst, we have been able to distinguish between competing photothermal and hot-carrier driven mechanistic pathways...
June 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28635267/cytochrome-c-provides-an-electron-funneling-antenna-for-efficient-photocurrent-generation-in-a-reaction-center-biophotocathode
#9
Vincent Morris Friebe, Diego Millo, David Swainsbury, Michael R Jones, Raoul N Frese
The high quantum efficiency of photosynthetic reaction centers make them attractive for bioelectronic and biophoto-voltaic applications. However, much of the native reaction center efficiency is lost in communication between surface bound reaction centers and electrode materials. State of the art biophotoelectrodes utilizing cytochrome c (cyt c) as a biological wiring agent have at best approached 32% retained RC quantum efficiency. However, bottlenecks in cyt c -mediated electron transfer have not been fully elucidated...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632334/functional-analysis-of-female-biased-odorant-binding-protein-6-for-volatile-and-nonvolatile-host-compounds-in-adelphocoris-lineolatus-goeze
#10
L Sun, Q Wang, S Yang, Q Wang, Z Zhang, A Khashaveh, Y-J Zhang, Y-Y Guo
The polyphagous mirid bug Adelphocoris lineolatus relies heavily on olfactory cues to track suitable host plants. Thus, a better understanding of the molecular basis of its olfactory detection could contribute to the development of effective pest management strategies. In the present study, we report the expression profile of the odorant binding protein gene A. lineolatus odorant binding protein 6 (AlinOBP6). Quantitative real-time PCR experiments suggest that AlinOBP6 is female adult antennae-biased. Cellular immunolocalization analyses show that AlinOBP6 is highly expressed in the lymph of both multiporous sensilla basiconica and uniporous sensilla chaetica...
June 20, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28631337/a-method-to-assess-the-loss-of-a-dipole-antenna-for-ultra-high-field-mri
#11
Gang Chen, Christopher M Collins, Daniel K Sodickson, Graham C Wiggins
PURPOSE: To describe a new bench measurement based on quality (Q) factors to estimate the coil noise relative to the sample noise of dipole antennas at 7 T. METHODS: Placing a dipole antenna close to a highly conductive sample surrogate (HCSS) greatly reduces radiation loss, and using QHCSS gives a more accurate estimate of coil resistance than Qunloaded . Instead of using the ratio of unloaded and sample-loaded Q factors, the ratio of HCSS-loaded and sample-loaded Q factors should be used at ultra-high fields...
June 19, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28629577/comparison-of-ultrasonography-guided-percutaneous-microwave-ablation-for-subcapsular-and-nonsubcapsular-hepatocellular-carcinoma
#12
Fangyi Liu, Xiaoling Yu, Zhigang Cheng, Zhiyu Han, Ya Sun, Ping Liang, Fubo Zhou
PURPOSE: To compare the prognosis of subcapsular and nonsubcapsular hepatocellular carcinoma (HCC) after ultrasonography (US)-guided percutaneous microwave ablation (MWA). MATERIALS AND METHODS: From January 2012 to December 2015, 463 enrollment patients (382 men, 81 women; age range, 24-95 years) with a single HCC underwent US-guided percutaneous MWA. The patients were divided into two groups according to tumor location: subcapsular (n=224) and nonsubcapsular (n=239)...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28629134/fabrication-of-circuits-on-flexible-substrates-using-conductive-su-8-for-sensing-applications
#13
Carlos D Gerardo, Edmond Cretu, Robert Rohling
This article describes a new low-cost rapid microfabrication technology for high-density interconnects and passive devices on flexible substrates for sensing applications. Silver nanoparticles with an average size of 80 nm were used to create a conductive SU-8 mixture with a concentration of wt 25%. The patterned structures after hard baking have a sheet resistance of 11.17 Ω /□. This conductive SU-8 was used to pattern planar inductors, capacitors and interconnection lines on flexible Kapton film. The conductive SU-8 structures were used as a seed layer for a subsequent electroplating process to increase the conductivity of the devices...
June 17, 2017: Sensors
https://www.readbyqxmd.com/read/28628172/trichomes-as-a-natural-biophysical-barrier-for-plants-and-their-bioinspired-applications
#14
Han Liu, Shaobao Liu, Jiaojiao Jiao, Tian Jian Lu, Feng Xu
Nature has inspired mankind to create novel inventions with biomimetic structures and materials, where plants provide a significant source of inspiration. Plants have evolved a range of effective appendages, among which trichomes have attracted extensive research interest due to their enormous functions. It is important to understand trichome functions and corresponding mechanisms for their bioinspired applications. In this review, we provide a comprehensive overview of the diverse functions of trichomes, with emphasis placed upon their roles as biophysical barriers that can create a complex three-dimensional (3D) network to help the plant adapt to severe environments...
June 19, 2017: Soft Matter
https://www.readbyqxmd.com/read/28625917/the-cholangiocyte-primary-cilium-in-health-and-disease
#15
REVIEW
Adrian P Mansini, Estanislao Peixoto, Kristen M Thelen, Cesar Gaspari, Sujeong Jin, Sergio A Gradilone
Cholangiocytes, like most cells, express primary cilia extending from their membranes. These organelles function as antennae which detect stimuli from bile and transmit the information into cells regulating several signaling pathways involved in secretion, proliferation and apoptosis. The ability of primary cilia to detect different signals is provided by ciliary associated proteins which are expressed in its membrane. Defects in the structure and/or function of these organelles lead to cholangiociliopathies that result in cholangiocyte hyperproliferation, altered fluid secretion and absorption...
June 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28624684/photoprotection-regulated-by-phosphorus-application-can-improve-photosynthetic-performance-and-alleviate-oxidative-damage-in-dwarf-bamboo-subjected-to-water-stress
#16
Chenggang Liu, Yanjie Wang, Yanqiang Jin, Kaiwen Pan, Xingmei Zhou, Na Li
Water and nutrients, particularly phosphorus (P), are the two most limiting factors for dwarf bamboo growth in tropical and subtropical areas. Dwarf bamboo is highly sensitive to water stress and often causes severe P deficiency in its growing soils due to the characteristics of shallower roots and expeditious growth. However, little is known about its photoprotective response to soil water deficit and the underlying mechanisms regulated by P application. In this study, a completely randomized design with two factors of two water regimes (well-watered and water-stressed) and two P levels (with and without P application) was arranged to investigate this issue in dwarf bamboo (Fargesia rufa) plants...
June 8, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28623797/phenotypic-defects-in-newborn-gammarus-fossarum-amphipoda-following-embryonic-exposure-to-fenoxycarb
#17
Hélène Arambourou, Arnaud Chaumot, Emmanuelle Vulliet, Gaëlle Daniele, Nicolas Delorme, Khédidja Abbaci, Vincent Debat
During morphogenesis numerous morphogenetic factors ensure the production of a target phenotype. By disrupting these processes, a toxic exposure during this period could cause an increase of phenotypic defects. In the present study, embryos of the freshwater amphipod Gammarus fossarum were exposed throughout the embryogenesis to increasing concentrations of fenoxycarb (0, 0.5µgL(-1), 5µgL(-1) and 50µgL(-1)), a growth regulator insecticide analog of the insect juvenile hormone. In addition, to identify morphogenesis' sensitive period, embryos were exposed during either early or late embryonic development to 5µgL(-1) of fenoxycarb...
June 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28622614/desirable-difficulties-during-the-development-of-active-inquiry-skills
#18
George Kachergis, Marjorie Rhodes, Todd Gureckis
This study explores developmental changes in the ability to ask informative questions, hypothesizing a link between the ability to update beliefs in light of evidence and the ability to ask informative questions. Five- to ten-year-old children played an iPad game asking them to identify a hidden insect. Learners could either ask about individual insects, or make a series of feature queries (e.g., "Does the hidden insect have antenna?") that could more efficiently narrow the hypothesis space. Critically, the task display either helped children integrate evidence with the hypothesis space or required them to perform this operation themselves...
June 13, 2017: Cognition
https://www.readbyqxmd.com/read/28619535/evolution-and-regulation-of-bigelowiella-natans-light-harvesting-antenna-system
#19
Jonathan A D Neilson, Pattarasiri Rangsrikitphoti, Dion G Durnford
Bigelowiella natans is a mixotrophic flagellate and member of the chlorarachniophytes (Rhizaria), whose plastid is derived from a green algal endosymbiont. With the completion of the B. natans nuclear genome we are able to begin the analysis of the structure, function and evolution of the photosynthetic apparatus. B. natans has undergone substantial changes in photosystem structure during the evolution of the plastid from a green alga. While Photosystem II (PSII) composition is well conserved, Photosystem I (PSI) composition has undergone a dramatic reduction in accessory protein subunits...
May 31, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28617604/directional-emission-from-dielectric-leaky-wave-nanoantennas
#20
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
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