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https://www.readbyqxmd.com/read/28719739/graphene-electronic-tattoo-sensors
#1
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics owing to their thinness and softness. While most of them are based on thin metal films, silicon membrane, or nanoparticle-based printable inks, we report a sub-micron thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed with filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ~85%, and a stretchability of more than 40%...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719616/analytical-network-process-based-optimum-cluster-head-selection-in-wireless-sensor-network
#2
Haleem Farman, Huma Javed, Bilal Jan, Jamil Ahmad, Shaukat Ali, Falak Naz Khalil, Murad Khan
Wireless Sensor Networks (WSNs) are becoming ubiquitous in everyday life due to their applications in weather forecasting, surveillance, implantable sensors for health monitoring and other plethora of applications. WSN is equipped with hundreds and thousands of small sensor nodes. As the size of a sensor node decreases, critical issues such as limited energy, computation time and limited memory become even more highlighted. In such a case, network lifetime mainly depends on efficient use of available resources...
2017: PloS One
https://www.readbyqxmd.com/read/28719577/physical-limits-to-biomechanical-sensing-in-disordered-fibre-networks
#3
Farzan Beroz, Louise M Jawerth, Stefan Münster, David A Weitz, Chase P Broedersz, Ned S Wingreen
Cells actively probe and respond to the stiffness of their surroundings. Since mechanosensory cells in connective tissue are surrounded by a disordered network of biopolymers, their in vivo mechanical environment can be extremely heterogeneous. Here we investigate how this heterogeneity impacts mechanosensing by modelling the cell as an idealized local stiffness sensor inside a disordered fibre network. For all types of networks we study, including experimentally-imaged collagen and fibrin architectures, we find that measurements applied at different points yield a strikingly broad range of local stiffnesses, spanning roughly two decades...
July 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28719195/fluorinated-boronic-acid-appended-pyridinium-salts-and-19f-nmr-spectroscopy-for-diol-sensing
#4
Jörg Axthelm, Sven H C Askes, Martin Elstner, Upendar Reddy Gandra, Helmar Görls, Peter Bellstedt, Alexander Schiller
The identification and discrimination of diols is of fundamental importance in medical diagnostics, such as measuring the contents of glucose in the urine of diabetes patients. Diol sensors are often based on fluorophore-appended boronic acids, but these severely lack discrimination power and their response is one-dimensional. As an alternative strategy, we present the use of fluorinated boronic acid-appended pyridinium salts in combination with 19F NMR spectroscopy. A pool of 59 (bio)analytes was screened, containing monosaccharides, phosphorylated and N-acetylated sugars, polyols, carboxylic acids, nucleotides and amines...
July 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28719176/investigation-on-the-electrocatalytic-determination-and-photocatalytic-degradation-of-neurotoxicity-drug-clioquinol-by-sn-moo4-2-nanoplates
#5
Raj Karthik, Jeyaraj Vinoth Kumar, Shen-Ming Chen, Kumar Seerangan, Chelladurai Karuppiah, Tse Wei Chen, Velluchamy Muthuraj
Transition metal molybdates have concerned enormous curiosity as supercapacitors, photocatalysts and electrocatalysts. These materials are best alternative to noble metal based catalysts which are generally show a limited photocatalytic and electrocatalytic activity. As well, the anti-protozoal drug can usually pollute the environment through improper disposable/incomplete metabolism and it is very dangerous to the human as well as aquatic animals. Therefore, here, we have studied the electrochemical determination and photodegradation of neurotoxicity clioquinol (CQL) drug by nanoplates-like tin molybdate (Sn(MoO4)2; denoted as SnM), which is played as both electro and photocatalyst...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28719145/preparation-of-carbon-dot-based-ratiometric-fluorescent-probes-for-cellular-imaging-from-curcuma-longa
#6
Zihnil Adha Islamy Mazrad, Eun Bi Kang, Insik In, Sung Young Park
This work derived biocompatible and stable probes based on fluorescent nanoparticles (FNPs) from a natural source, Curcuma longa. The multi-color fluorescence emissions from carbonized Curcuma longa (C-FNPs) obtained through defined dehydration conditions are soluble in water and have a small particle size (~17 nm). The surface passivation with polyethylene glycol (PEG) capped with amine groups in FNPs (P-FNPs) generated a probe with a higher quantum yield and longer fluorescence lifetime than obtained with C-FNPs...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28719069/inaccuracy-of-a-continuous-arterial-pressure-waveform-monitor-when-used-for-congenital-cardiac-catheterization
#7
Michael D Seckeler, Katri Typpo, Jendar Deschenes, Ruth Higgins, Ricardo Samson, Peter Lichtenthal
OBJECTIVE: To determine the accuracy of a continuous cardiac output monitor (FloTrac sensor) for measuring cardiac index in children with congenital heart disease undergoing cardiac catheterization. Cardiac index is a critical hemodynamic parameter measured during catheterizations in children with congenital heart disease. This has been challenging to measure accurately and many clinicians rely on predictive equations for calculating cardiac index. DESIGN: Prospective, nonrandomized trial...
July 18, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28718924/preliminary-study-of-a-novel-puborectalis-like-artificial-anal-sphincter
#8
Wentian Jin, Guozheng Yan, Hao Wu, Shan Lu, Zerun Zhou
Artificial anal sphincter (AAS) is an in situ implanted device that acts as a treatment for fecal incontinence regardless of etiology by augmenting the incompetent sphincteric structures. However, AAS is impeded from becoming a valid therapy by its high rate of ischemic complication and malfunction. This article presents an original puborectalis-like artificial anal sphincter (PAAS) that features a low risk of ischemia necrosis and rectal perception remodeling. The device retains continence by reproducing the action, including the pulling and angulating the rectum, of the puborectalis muscle, which forms the anorectal angle and reduces the required clamping pressure...
July 18, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28718841/development-of-an-immunosensor-for-pfhrp-2-as-a-biomarker-for-malaria-detection
#9
Aver Hemben, Jon Ashley, Ibtisam E Tothill
Plasmodium falciparum histidine-rich protein 2 (PfHRP 2) was selected in this work as the biomarker for the detection and diagnosis of malaria. An enzyme-linked immunosorbent assay (ELISA) was first developed to evaluate the immunoreagent's suitability for the sensor's development. A gold-based sensor with an integrated counter and an Ag/AgCl reference electrode was first selected and characterised and then used to develop the immunosensor for PfHRP 2, which enables a low cost, easy to use, and sensitive biosensor for malaria diagnosis...
July 18, 2017: Biosensors
https://www.readbyqxmd.com/read/28718826/enhanced-strain-measurement-range-of-an-fbg-sensor-embedded-in-seven-wire-steel-strands
#10
Jae-Min Kim, Chul-Min Kim, Song-Yi Choi, Bang Yeon Lee
FBG sensors offer many advantages, such as a lack of sensitivity to electromagnetic waves, small size, high durability, and high sensitivity. However, their maximum strain measurement range is lower than the yield strain range (about 1.0%) of steel strands when embedded in steel strands. This study proposes a new FBG sensing technique in which an FBG sensor is recoated with polyimide and protected by a polyimide tube in an effort to enhance the maximum strain measurement range of FBG sensors embedded in strands...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718804/electromagnetic-differential-measuring-method-application-in-microstrip-sensors-developing
#11
Francisco Javier Ferrández-Pastor, Juan Manuel García-Chamizo, Mario Nieto-Hidalgo
Electromagnetic radiation is energy that interacts with matter. The interaction process is of great importance to the sensing applications that characterize material media. Parameters like constant dielectric represent matter characteristics and they are identified using emission, interaction and reception of electromagnetic radiation in adapted environmental conditions. How the electromagnetic wave responds when it interacts with the material media depends on the range of frequency used and the medium parameters...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718793/detection-of-guanine-and-adenine-using-an-aminated-reduced-graphene-oxide-functional-membrane-modified-glassy-carbon-electrode
#12
Di Li, Xiao-Lu Yang, Bao-Lin Xiao, Fang-Yong Geng, Jun Hong, Nader Sheibani, Ali Akbar Moosavi-Movahedi
A new electrochemical sensor based on a Nafion, aminated reduced graphene oxide and chitosan functional membrane-modified glassy carbon electrode was proposed for the simultaneous detection of adenine and guanine. Fourier transform-infrared spectrometry (FTIR), transmission electron microscopy (TEM), and electrochemical methods were utilized for the additional characterization of the membrane materials. The prepared electrode was utilized for the detection of guanine (G) and adenine (A). The anodic peak currents to G and A were linear in the concentrations ranging from 0...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718788/implementation-of-an-imu-aided-image-stacking-algorithm-in-a-digital-camera-for-unmanned-aerial-vehicles
#13
Ahmad Audi, Marc Pierrot-Deseilligny, Christophe Meynard, Christian Thom
Images acquired with a long exposure time using a camera embedded on UAVs (Unmanned Aerial Vehicles) exhibit motion blur due to the erratic movements of the UAV. The aim of the present work is to be able to acquire several images with a short exposure time and use an image processing algorithm to produce a stacked image with an equivalent long exposure time. Our method is based on the feature point image registration technique. The algorithm is implemented on the light-weight IGN (Institut national de l'information géographique) camera, which has an IMU (Inertial Measurement Unit) sensor and an SoC (System on Chip)/FPGA (Field-Programmable Gate Array)...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718778/tailoring-of-magnetic-orderings-in-fe-substituted-gdmno-sub-3-sub-bulk-samples-towards-room-temperature
#14
Arnab Pal, C Dhana Sekhar, Adyam Venimadhav, Pattukkannu Murugavel
The evolution of various magnetic ordering has been studied for orthorhombic perovskite GdMn<sub>1-<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>3</sub> (0 ≤ <i>x</i> ≤ 0.7) system to get its comprehensive magnetic phase diagram. We observed that the substitution of Fe in GdMnO<sub>3</sub> increases the antiferromagnetic Neel temperature (T<sub>N</sub>) from 40 K to above 400 K and importantly induces a spin-reorientation transition (T<sub>SR</sub>) for <i>x</i> ≥ 0...
July 18, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28718763/a-theory-of-working-memory-without-consciousness-or-sustained-activity
#15
Darinka Trübutschek, Sébastien Marti, Andrés Ojeda, Jean-Rémi King, Yuanyuan Mi, Misha Tsodyks, Stanislas Dehaene
Working memory and conscious perception are thought to share similar brain mechanisms, yet recent reports of non-conscious working memory challenge this view. Combining visual masking with magnetoencephalography, we investigate the reality of non-conscious working memory and dissect its neural mechanisms. In a spatial delayed-response task, participants reported the location of a subjectively unseen target above chance-level after several seconds. Conscious perception and conscious working memory were characterized by similar signatures: a sustained desynchronization in the alpha/beta band over frontal cortex, and a decodable representation of target location in posterior sensors...
July 18, 2017: ELife
https://www.readbyqxmd.com/read/28718633/tio2-nanorods-decorated-with-pd-nanoparticles-for-enhanced-liquefied-petroleum-gas-sensing-performance
#16
Dattatray S Dhawale, Tanaji Pralhad Gujar, Chandrakant D Lokhande
The development of highly sensitive and selective semiconductor based metal oxide sensor devices to detect toxic, ex-plosive, flammable and pollutant gases is still a challenging research topic. In the present work, we systematically en-hanced the liquefied petroleum gas (LPG) sensing performance of chemical bath deposited (CBD) TiO2 nanorods by decorating Pd nanoparticle catalyst. Surface morphology with elemental mapping, crystal structure, composition and oxidation states and surface area measurements of pristine TiO2 and Pd:TiO2 nanorods were examined by high resolu-tion transmission electron microscopy (HR-TEM) equipped with an EDS detector, X-ray diffraction (XRD), X-ray pho-toelectron spectroscopy (XPS) and nitrogen adsorption-desorption characterization techniques...
July 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28718466/exploring-viscosity-polarity-and-temperature-sensitivity-of-bodipy-based-molecular-rotors
#17
Aurimas Vyšniauskas, Ismael López-Duarte, Nicolas Duchemin, Thanh-Truc Vu, Yilei Wu, Ekaterina M Budynina, Yulia A Volkova, Eduardo Peña Cabrera, Diana E Ramírez-Ornelas, Marina K Kuimova
Microviscosity is a key parameter controlling the rate of diffusion and reactions on the microscale. One of the most convenient tools for measuring microviscosity is by fluorescent viscosity sensors termed 'molecular rotors'. BODIPY-based molecular rotors in particular proved extremely useful in combination with fluorescence lifetime imaging microscopy, for providing quantitative viscosity maps of living cells as well as measuring dynamic changes in viscosity over time. In this work, we investigate several new BODIPY-based molecular rotors with the aim of improving on the current viscosity sensing capabilities and understanding how the structure of the fluorophore is related to its function...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718456/graphene-oxide-and-dna-aptamer-based-sub-nanomolar-potassium-detecting-optical-nanosensor
#18
Debopam Datta, Ketaki Sarkar, Souvik Mukherjee, Xenia Meshik, Michael A Stroscio, Mitra Dutta
Quantum-dot (QD) based nanosensors are frequently used by researchers to detect small molecules, ions and different biomolecules. In this article, we present a sensor complex/system comprised of deoxyribonucleic acid (DNA) aptamer, gold nanoparticle and semiconductor QD, attached to a graphene oxide (GO) flake for detection of potassium. As reported herein, it is demonstrated that QD-aptamer-quencher nanosensor functions even when tethered to GO, opening the way to future applications where sensing can be accomplished simultaneously with other previously demonstrated applications of GO such as serving as a nanocarrier for drug delivery...
July 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28718028/predicting-attenuation-of-solar-radiation-uv-b-uv-a-and-par-in-waste-stabilization-ponds-under-sahelian-climatic-conditions
#19
Ynoussa Maiga, Joseph Wethé, Aboubakar Sidiki Ouattara, Alfred S Traoré
Because of its importance in pathogen removal and algal productivity in waste stabilization ponds, sunlight penetration was measured in microcosms and in situ under Sahelian climatic conditions. The different wavelengths were detected using a submersible radiometer equipped with three sensors: UV-B (311 nm), UV-A (369 nm) and photosynthetically available radiation (PAR, 400-700 nm). UV-B was more attenuated than UV-A and PAR. Facultative pond was more light-attenuating than maturation pond. The mean euphotic depths for UV-B were 0...
July 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28718001/a-new-device-for-fiducial-registration-of-image-guided-navigation-system-for-liver-rfa
#20
Nobutaka Doba, Hiroyuki Fukuda, Kazushi Numata, Yoshiteru Hao, Kouji Hara, Akito Nozaki, Masaaki Kondo, Makoto Chuma, Katsuaki Tanaka, Shigeo Takebayashi, Norihiro Koizumi, Akira Kobayashi, Junichi Tokuda, Shin Maeda
PURPOSE: Radiofrequency ablation for liver tumors (liver RFA) is widely performed under ultrasound guidance. However, discriminating between the tumor and the needle is often difficult because of cavitation caused by RFA-induced coagulation. An unclear ultrasound image can lead to complications and tumor residue. Therefore, image-guided navigation systems based on fiducial registration have been developed. Fiducial points are usually set on a patient's skin. But the use of internal fiducial points can improve the accuracy of navigation...
July 17, 2017: International Journal of Computer Assisted Radiology and Surgery
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