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https://www.readbyqxmd.com/read/28230354/chemical-modification-of-semiconductor-surfaces-for-molecular-electronics
#1
Ayelet Vilan, David Cahen
Inserting molecular monolayers within metal/semiconductor interfaces provides one of the most powerful expressions of how minute chemical modifications can affect electronic devices. This topic also has direct importance for technology as it can help improve the efficiency of a variety of electronic devices such as solar cells, LEDs, sensors, and possible future bioelectronic ones. The review covers the main aspects of using chemistry to control the various aspects of interface electrostatics, such as passivation of interface states and alignment of energy levels by intrinsic molecular polarization, as well as charge rearrangement with the adjacent metal and semiconducting contacts...
February 23, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28227720/can-we-make-a-carpet-smart-enough-to-detect-falls
#2
Fadi Muheidat, Harry W Tyrer, Fadi Muheidat, Harry W Tyrer, Harry W Tyrer, Fadi Muheidat
In this paper, we have enhanced smart carpet, which is a floor based personnel detector system, to detect falls using a faster but low cost processor. Our hardware front end reads 128 sensors, with sensors output a voltage due to a person walking or falling on the carpet. The processor is Jetson TK1, which provides more computing power than before. We generated a dataset with volunteers who walked and fell to test our algorithms. Data obtained allowed examining data frames (a frame is a single scan of the carpet sensors) read from the data acquisition system...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227608/a-triboelectric-motion-sensor-in-wearable-body-sensor-network-for-human-activity-recognition
#3
Hui Huang, Xian Li, Ye Sun, Hui Huang, Xian Li, Ye Sun, Ye Sun, Hui Huang, Xian Li
The goal of this study is to design a novel triboelectric motion sensor in wearable body sensor network for human activity recognition. Physical activity recognition is widely used in well-being management, medical diagnosis and rehabilitation. Other than traditional accelerometers, we design a novel wearable sensor system based on triboelectrification. The triboelectric motion sensor can be easily attached to human body and collect motion signals caused by physical activities. The experiments are conducted to collect five common activity data: sitting and standing, walking, climbing upstairs, downstairs, and running...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226889/dual-mode-cmos-analog-front-end-afe-for-electrical-impedance-spectroscopy-eis-systems
#4
Virgilio Valente, Dai Jiang, Andreas Demosthenous, Virgilio Valente, Dai Jiang, Andreas Demosthenous, Dai Jiang, Andreas Demosthenous, Virgilio Valente
This paper presents the operation of a dual-mode wideband CMOS analog front-end (AFE) for electrical impedance spectroscopy. The chip combines two current-readout (CR) channels and four voltage-readout (VR) channels suitable for both bipolar and tetrapolar EIS analysis. The chip addresses the need for flexible readout units for real-time simultaneous single-cell and large scale tissue/organ analysis. Postlayout simulations show that the VR channel is capable of wideband operation up to 12 MHz with noise floor as low as 16...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220076/actions-and-mechanisms-of-polyunsaturated-fatty-acids-on-voltage-gated-ion-channels
#5
REVIEW
Fredrik Elinder, Sara I Liin
Polyunsaturated fatty acids (PUFAs) act on most ion channels, thereby having significant physiological and pharmacological effects. In this review we summarize data from numerous PUFAs on voltage-gated ion channels containing one or several voltage-sensor domains, such as voltage-gated sodium (NaV), potassium (KV), calcium (CaV), and proton (HV) channels, as well as calcium-activated potassium (KCa), and transient receptor potential (TRP) channels. Some effects of fatty acids appear to be channel specific, whereas others seem to be more general...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28219725/planar-implantable-sensor-for-in-vivo-measurement-of-cellular-oxygen-metabolism-in-brain-tissue
#6
Vassiliy Tsytsarev, Fatih Akkenti, Elena Pumbo, Qinggong Tang, Yu Chen, Reha S Erzurumlu, Dmitri B Papkovsky
BACKGROUND: Brain imaging methods are continually improving. Imaging of the cerebral cortex is widely used in both animal experiments and charting human brain function in health and disease. Among the animal models, the rodent cerebral cortex has been widely used because of patterned neural representation of the whiskers on the snout and relative ease of activating cortical tissue with whisker stimulation. NEW METHOD: We tested a new planar solid-state oxygen sensor comprising a polymeric film with a phosphorescent oxygen-sensitive coating on the working side, to monitor dynamics of oxygen metabolism in the cerebral cortex following sensory stimulation...
February 17, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28218797/ultrasensitive-2d-zno-piezotronic-transistor-array-for-high-resolution-tactile-imaging
#7
Shuhai Liu, Longfei Wang, Xiaolong Feng, Zheng Wang, Qi Xu, Suo Bai, Yong Qin, Zhong Lin Wang
In this paper, a new kind of 2D piezotronic transistor (PT) with the highest sensitivity till date has been designed and demonstrated, and the 2DPT array with ultrahigh spatial resolution has been developed through assembling ZnO nanoplatelets into ordered nanoplatelet array. As active sensors by directly converting applied mechanical actuations into electrical control signals without applying gate voltage, the ZnO 2DPT array has a great advantage as a fundamental component of piezotronics. The 2DPT array paves the way for a large-scale and integrated production of two terminal vertical transistors, which will contribute to its application in many fields such as human-machine interfacing, smart sensor, and processor systems...
February 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28218673/a-high-performance-piezoelectric-sensor-for-dynamic-force-monitoring-of-landslide
#8
Ming Li, Wei Cheng, Jiangpan Chen, Ruili Xie, Xiongfei Li
Due to the increasing influence of human engineering activities, it is important to monitor the transient disturbance during the evolution process of landslide. For this purpose, a high-performance piezoelectric sensor is presented in this paper. To adapt the high static and dynamic stress environment in slope engineering, two key techniques, namely, the self-structure pressure distribution method (SSPDM) and the capacitive circuit voltage distribution method (CCVDM) are employed in the design of the sensor...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28208693/a-miniature-magnetic-force-based-three-axis-ac-magnetic-sensor-with-piezoelectric-vibrational-energy-harvesting-functions
#9
Chiao-Fang Hung, Po-Chen Yeh, Tien-Kan Chung
In this paper, we demonstrate a miniature magnetic-force-based, three-axis, AC magnetic sensor with piezoelectric/vibrational energy-harvesting functions. For magnetic sensing, the sensor employs a magnetic-mechanical-piezoelectric configuration (which uses magnetic force and torque, a compact, single, mechanical mechanism, and the piezoelectric effect) to convert x-axis and y-axis in-plane and z-axis magnetic fields into piezoelectric voltage outputs. Under the x-axis magnetic field (sine-wave, 100 Hz, 0.2-3...
February 8, 2017: Sensors
https://www.readbyqxmd.com/read/28208296/ultrasensitive-self-powered-aptasensor-based-on-enzyme-biofuel-cell-and-dna-bioconjugate-a-facile-and-powerful-tool-for-antibiotic-residue-detection
#10
Panpan Gai, Chengcheng Gu, Ting Hou, Feng Li
Herein, we reported a novel ultrasensitive one-compartment enzyme biofuel cells (EBFCs)-based self-powered aptasensing platform for antibiotic residue detection. By taking full advantage of the unique features of both EBFCs-based self-powered sensors and aptamers, the as-proposed aptasensing platform has the merits of simple instrumentation, anti-interference ability, high selectivity, and low cost. In this study, DNA bioconjugate, i.e., SiO2@gold nanoparticles-complementary strand of aptamer (SiO2@AuNPs-csDNA), was elaborately designed and played a key role in blocking the mass transport of glucose to the bioanode...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28205548/the-complete-structure-of-an-activated-open-sodium-channel
#11
Altin Sula, Jennifer Booker, Leo C T Ng, Claire E Naylor, Paul G DeCaen, B A Wallace
Voltage-gated sodium channels (Navs) play essential roles in excitable tissues, with their activation and opening resulting in the initial phase of the action potential. The cycling of Navs through open, closed and inactivated states, and their closely choreographed relationships with the activities of other ion channels lead to exquisite control of intracellular ion concentrations in both prokaryotes and eukaryotes. Here we present the 2.45 Å resolution crystal structure of the complete NavMs prokaryotic sodium channel in a fully open conformation...
February 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28202723/mapping-of-voltage-sensor-positions-in-resting-and-inactivated-mammalian-sodium-channels-by-lret
#12
Tomoya Kubota, Thomas Durek, Bobo Dang, Rocio K Finol-Urdaneta, David J Craik, Stephen B H Kent, Robert J French, Francisco Bezanilla, Ana M Correa
Voltage-gated sodium channels (Navs) play crucial roles in excitable cells. Although vertebrate Nav function has been extensively studied, the detailed structural basis for voltage-dependent gating mechanisms remain obscure. We have assessed the structural changes of the Nav voltage sensor domain using lanthanide-based resonance energy transfer (LRET) between the rat skeletal muscle voltage-gated sodium channel (Nav1.4) and fluorescently labeled Nav1.4-targeting toxins. We generated donor constructs with genetically encoded lanthanide-binding tags (LBTs) inserted at the extracellular end of the S4 segment of each domain (with a single LBT per construct)...
February 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28197074/the-first-extracellular-linker-is-important-for-several-aspects-of-the-gating-mechanism-of-human-trpa1-channel
#13
Lenka Marsakova, Ivan Barvik, Vlastimil Zima, Lucie Zimova, Viktorie Vlachova
Transient receptor potential ankyrin 1 (TRPA1) is an excitatory ion channel involved in pain, inflammation and itching. This channel gates in response to many irritant and proalgesic agents, and can be modulated by calcium and depolarizing voltage. While the closed-state structure of TRPA1 has been recently resolved, also having its open state is essential for understanding how this channel works. Here we use molecular dynamics simulations combined with electrophysiological measurements and systematic mutagenesis to predict and explore the conformational changes coupled to the expansion of the presumptive channel's lower gate...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28196879/deletion-of-cytosolic-gating-ring-decreases-gate-and-voltage-sensor-coupling-in-bk-channels
#14
Guohui Zhang, Yanyan Geng, Yakang Jin, Jingyi Shi, Kelli McFarland, Karl L Magleby, Lawrence Salkoff, Jianmin Cui
Large conductance Ca(2+)-activated K(+) channels (BK channels) gate open in response to both membrane voltage and intracellular Ca(2+) The channel is formed by a central pore-gate domain (PGD), which spans the membrane, plus transmembrane voltage sensors and a cytoplasmic gating ring that acts as a Ca(2+) sensor. How these voltage and Ca(2+) sensors influence the common activation gate, and interact with each other, is unclear. A previous study showed that a BK channel core lacking the entire cytoplasmic gating ring (Core-MT) was devoid of Ca(2+) activation but retained voltage sensitivity (Budelli et al...
February 14, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/28192090/optogenetic-control-of-ca-2-and-voltage-dependent-large-conductance-bk-potassium-channels
#15
Thomas Mager, Phillip G Wood, Ernst Bamberg
Ca(2+) concentration jumps for the activation of Ca(2+)-dependent ion channels or transporters can be obtained either by fast solution exchange or by the use of caged Ca(2+). Here, we report on an alternate optogenetic method for the activation of Ca(2+) and voltage-dependent large conductance (BK) potassium channels. This was achieved through the use of the light-gated channelrhodopsin 2 variant, CatCh(Calcium translocating Channelrhodopsin) with enhanced Ca, which produces locally [Ca(2+)] in the μM range on the inner side of the membrane, without significant [Ca(2+)] increase in the cytosol...
February 10, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28183067/acoustic-power-delivery-to-pipeline-monitoring-wireless-sensors
#16
M E Kiziroglou, D E Boyle, S W Wright, E M Yeatman
The use of energy harvesting for powering wireless sensors is made more challenging in most applications by the requirement for customization to each specific application environment because of specificities of the available energy form, such as precise location, direction and motion frequency, as well as the temporal variation and unpredictability of the energy source. Wireless power transfer from dedicated sources can overcome these difficulties, and in this work, the use of targeted ultrasonic power transfer as a possible method for remote powering of sensor nodes is investigated...
January 23, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28181792/epitaxial-growth-of-mof-thin-film-for-modifying-the-dielectric-layer-in-organic-field-effect-transistors
#17
Zhi-Gang Gu, Shan-Ci Chen, Wen-Qiang Fu, Qingdong Zheng, Jian Zhang
Metal-organic framework (MOF) thin films are important in the application of sensors and devices. However, the application of MOF thin films in organic field effect transistors (OFETs) is still a challenge to date. Here, we first use the MOF thin film prepared by a liquid-phase epitaxial (LPE) approach (also called SURMOFs) to modify the SiO2 dielectric layer in the OFETs. After the semiconductive polymer of PTB7-Th (poly[4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b:4,5-b']dithiophene-co-3-fluorothieno[3,4-b]thiophene-2-carboxylate]) was coated on MOF/SiO2 and two electrodes on the semiconducting film were deposited sequentially, MOF-based OFETs were fabricated successfully...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28177929/one-step-fabrication-of-single-crystalline-zns-nanotubes-with-a%C3%A2-novel-hollow-structure-and-large-surface-area-for-photodetector-devices
#18
Qinwei An, Xianquan Meng, Ke Xiong, Yunlei Qiu, Weihua Lin
ZnS nanotubes (NTs) were successfully prepared via a one-step thermal evaporation process without using any templates. The resulting NTs were single crystalline and structurally uniform. Based on experimental analysis, a tube-growth vapor-liquid-solid process was proposed as the growth mechanism of ZnS NTs. A metal-semiconductor-metal full-nanostructured ultraviolet (UV) photodetector with ZnS NTs as the active layer, and Ag nanowires of low resistivity and high transmissivity as electrodes, was fabricated and characterized...
March 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28158008/independently-tunable-dual-band-plasmonically-induced-transparency-based-on-hybrid-metal-graphene-metamaterials-at-mid-infrared-frequencies
#19
Chen Sun, Zhewei Dong, Jiangnan Si, Xiaoxu Deng
A tunable dual-band plasmonically induced transparency (PIT) device based on hybrid metal-graphene nanostructures is proposed theoretically and numerically at mid-infrared frequencies, which is composed of two kinds of gold dolmen-like structures with different sizes placed on separate graphene interdigitated finger sets respectively. The coupled Lorentz oscillator model is used to explain the physical mechanism of the PIT effect at multiple frequency domains. The finite-difference time-domain (FDTD) solutions are employed to simulate the characteristics of the hybrid metal-graphene dual-band PIT device...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157964/fringe-tunable-electrothermal-fresnel-mirror-for-use-in-compact-and-high-speed-diffusion-sensor
#20
Yuki Kiuchi, Yoshihiro Taguchi, Yuji Nagasaka
This paper reports the development of an electrothermal microelectromechanical systems (MEMS) mirror with serpentine shape actuators. A micro Fresnel mirror with fringe-spacing tunability is required to realize a compact and high-speed diffusion sensor for biological samples whose diffusion coefficient changes significantly because of a conformational change. In this case, the measurement time-constant is dependent on the fringe-spacing and diffusion coefficient of the sample. In this study, a fringe-tunable MEMS mirror with an actuation voltage less than 10 V was developed...
January 23, 2017: Optics Express
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