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https://www.readbyqxmd.com/read/28636959/the-enteric-network-interactions-between-the-immune-and-nervous-systems-of-the-gut
#1
REVIEW
Bryan B Yoo, Sarkis K Mazmanian
Interactions between the nervous and immune systems enable the gut to respond to the variety of dietary products that it absorbs, the broad spectrum of pathogens that it encounters, and the diverse microbiome that it harbors. The enteric nervous system (ENS) senses and reacts to the dynamic ecosystem of the gastrointestinal (GI) tract by translating chemical cues from the environment into neuronal impulses that propagate throughout the gut and into other organs in the body, including the central nervous system (CNS)...
June 20, 2017: Immunity
https://www.readbyqxmd.com/read/28634760/thiago-regis-longo-cesar-da-paix%C3%A3-o-and-subrayal-m-reddy-eds-materials-for-chemical-sensing
#2
Marco Giannetto
No abstract text is available yet for this article.
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28631380/a-highly-sensitive-enzymatic-catalysis-system-for-trace-detection-of-arsenic-in-water
#3
Yuanli Liu, Chuanbai Yu, Zhixin Cao, Daniel Shvarts, William C Trogler
Arsenic (As) is an extremely toxic element that exists in the environment in different chemical forms. The detection of arsenic in potable water remains a challenging task. This study presents a highly sensitive enzymatic catalysis system for trace sensing of inorganic arsenic in water. This is the first enzyme-catalyzed fluorescence assay capable of detecting arsenic at concentrations below the allowable level adopted by the World Health Organization (10 ppb in drinking water). The enzyme catalytically produces fluorescent NADH in the presence of arsenate, which enables facile detection of arsenate at concentrations in the 0 - 200 ppb range...
June 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28629024/electrospun-silk-fibroin-scaffolds-coated-with-reduced-graphene-promote-neurite-outgrowth-of-pc-12-cells-under-electrical-stimulation
#4
Salvador Aznar-Cervantes, Ana Pagán, Jose G Martínez, Antonia Bernabeu-Esclapez, Toribio F Otero, Luis Meseguer-Olmo, Juan I Paredes, Jose L Cenis
Novel approaches to neural research require biocompatible materials capable to act as electrode structures or scaffolds for tissue engineering in order to stimulate or restore the functionality of damaged tissues. This work offers promising results that indicate the potential use of electrospun silk fibroin (SF) scaffolds coated with reduced graphene oxide (rGO) in this sense. The coated material becomes conductor and electroactive. A complete characterisation of SF/rGO scaffolds is provided in terms of electrochemistry, mechanical behaviour and chemical conformation of fibroin...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628292/an-environment-sensitive-turn-on-fluorescent-polyamino-acid-fingerprinting-protein-populations-with-post-translational-modifications
#5
Shunsuke Tomita, Sayaka Ishihara, Ryoji Kurita
The identification of post-translational modifications (PTMs) in proteins has been of particular interest in the elucidation of human diseases and the improvement of therapeutic proteins. Herein, we report a novel strategy toward the construction of fingerprint-based PTM sensing systems as an alternative to conventional specific recognition tools. Our strategy is based on poly-L-lysine (PLL) derivatives with two distinct properties suitable to fingerprint-based protein sensing: i) a "turn-on" fluorescent signal upon binding to proteins, and ii) condition-dependent cross-reactivity toward proteins and PTMs...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28624619/quorum-sensing-signals-enhance-the-electrochemical-activity-and-energy-recovery-of-mixed-culture-electroactive-biofilms
#6
Shanshan Chen, Xianyue Jing, Jiahuan Tang, Yanlun Fang, Shungui Zhou
The impacts of exogenous or endogenous quorum sensing (QS) signaling molecules on mixed-culture electroactive biofilms (EABs), especially extracellular polymeric substances (EPS) and exoelectrogens using direct electron transfer mechanism inside EABs are poorly understood. This research focuses on the influence of acylhomoserine lactones (AHLs), the most common QS signaling molecules for gram negative bacteria, on mixed-culture EABs. Results indicated that both exogenous and endogenous AHLs played the role as regulators to improve the electrochemical activities of EABs...
June 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28623744/obtaining-sparse-distributions-in-2d-inverse-problems
#7
A Reci, A J Sederman, L F Gladden
The mathematics of inverse problems has relevance across numerous estimation problems in science and engineering. L1 regularization has attracted recent attention in reconstructing the system properties in the case of sparse inverse problems; i.e., when the true property sought is not adequately described by a continuous distribution, in particular in Compressed Sensing image reconstruction. In this work, we focus on the application of L1 regularization to a class of inverse problems; relaxation-relaxation, T1-T2, and diffusion-relaxation, D-T2, correlation experiments in NMR, which have found widespread applications in a number of areas including probing surface interactions in catalysis and characterizing fluid composition and pore structures in rocks...
May 25, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28623662/advances-in-the-analysis-of-water-and-wastewater-samples-using-various-sensing-protocols-and-microfluidic-devices-based-on-pad-and-%C3%AE-tas-systems
#8
Krzysztof Piaskowski, Renata Świderska-Dąbrowska, Aleksandra Kaleniecka, Paweł K Zarzycki
The main goal of this review is to summarize practical approaches concerning the application of microfluidic systems for the analysis of various biomarkers and pollutants, as well as microbes, in water and wastewater matrixes. This problem involves multidisciplinary expertise combining research knowledge from various areas, including wet chemistry, biochemistry, physical chemistry, molecular biology, genetics, signal processing, microelectronics material science, and separation science. It has been documented that fairly primitive but fast and inexpensive screening methods involving paper-based analytical devices (PADs) and micro total analytical systems (μTAS) can be considered as serious alternatives to their more advanced counterparts such as GC, HPLC, and capillary electrophoresis coupled to various sophisticated detectors (e...
June 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28623343/data-driven-nanomechanical-sensing-specific-information-extraction-from-a-complex-system
#9
Kota Shiba, Ryo Tamura, Gaku Imamura, Genki Yoshikawa
Smells are known to be composed of thousands of chemicals with various concentrations, and thus, the extraction of specific information from such a complex system is still challenging. Herein, we report for the first time that the nanomechanical sensing combined with machine learning realizes the specific information extraction, e.g. alcohol content quantification as a proof-of-concept, from the smells of liquors. A newly developed nanomechanical sensor platform, a Membrane-type Surface stress Sensor (MSS), was utilized...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621041/extraordinarily-stretchable-all-carbon-collaborative-nanoarchitectures-for-epidermal-sensors
#10
Yichen Cai, Jie Shen, Ziyang Dai, Xiaoxian Zang, Qiuchun Dong, Guofeng Guan, Lain-Jong Li, Wei Huang, Xiaochen Dong
Multifunctional microelectronic components featuring large stretchability, high sensitivity, high signal-to-noise ratio (SNR), and broad sensing range have attracted a huge surge of interest with the fast developing epidermal electronic systems. Here, the epidermal sensors based on all-carbon collaborative percolation network are demonstrated, which consist 3D graphene foam and carbon nanotubes (CNTs) obtained by two-step chemical vapor deposition processes. The nanoscaled CNT networks largely enhance the stretchability and SNR of the 3D microarchitectural graphene foams, endowing the strain sensor with a gauge factor as high as 35, a wide reliable sensing range up to 85%, and excellent cyclic stability (>5000 cycles)...
June 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28620784/inhibitory-effect-of-taurine-on-biofilm-formation-during-alkane-degradation-in-acinetobacter-oleivorans-dr1
#11
Hyo Jung Eom, Woojun Park
Taurine, 2-aminoethanesulfonate, is known to function as an antioxidant or membrane stabilizer in eukaryotic cells, but its role in bacteria has been poorly characterized. Biofilm formation of Acinetobacter oleivorans DR1 was significantly reduced by taurine only during alkane degradation, suggesting that taurine affects alkane-induced cell surface. Structurally similar compounds harboring an amine group such as hypotaurine or ethylenediamine have a similar effect, which was not observed with sulfonate-containing chemicals such as ethanesulfonic acid, hexanesulfonic acid...
June 15, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28620658/band-gap-modulation-of-srtio3-upon-co2-adsorption
#12
Kostiantyn V Sopiha, Oleksandr I Malyi, Clas Persson, Ping Wu
Herein, CO2 chemisorption on SrTiO3(001) surfaces is studied using ab initio calculations to establish new chemical sensing mechanisms. It was found that CO2 adsorption opens the band gap of the material. However, the mechanisms are different: the CO2 adsorption on the TiO2-terminated surface neutralizes the surface states at the valence band (VB) maximum, whereas for the SrO-terminated surface it suppresses the conduction band (CB) minimum. For the TiO2-terminated surface, the effect is explained by the passivation of dangling bonds, whereas for the SrO-terminated surface, the suppression is caused by surface relaxation...
June 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28618364/amyloid-like-protein-nanofibrous-membranes-as-a-sensing-layer-infrastructure-for-the-design-of-mass-sensitive-biosensors
#13
Gözde Kabay, Gizem Kaleli Can, Mehmet Mutlu
Quartz crystal microbalances (QCMs) have been used in the literature for mass sensitive biosensor applications. However, their performance, reliability and stability have been limited by the chemical treatment steps required for the functionalization and activation of the QCM surface, prior to antibody immobilization. Specifically, these steps cause increased film thickness, which diminishes performance by mass overload, and create a harsh environment, which reduces biological activity. In this work, we eliminated this chemical step by introducing a sensing layer modification using electrospun amyloid like-bovine serum albumin (AL-BSA) nanofibers on QCM surfaces...
June 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28618212/quantum-chemistry-in-environmental-pesticide-risk-assessment
#14
Juan J Villaverde, Carmen López-Goti, Manuel Alcamí, Al Mokhtar Lamsabhi, José L Alonso-Prados, Pilar Sandín-España
BACKGROUND: The scientific community and regulatory bodies worldwide, currently promote the development of non-experimental tests that produce reliable data for pesticide risk assessment. The use of standard quantum chemistry methods could allow the development of tools to perform a first screening of compounds to be considered for the experimental studies, improving the risk assessment. This fact results in a better distribution of resources and in better planning, allowing a more exhaustive study of the pesticides and their metabolic products...
June 15, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28617668/flexible-room-temperature-formaldehyde-sensors-based-on-rgo-film-and-rgo-mos2-hybrid-film
#15
Xian Li, Jiang Wang, Dan Xie, Jianlong Xu, Yi Xia, Weiwei Li, Lan Xiang, Zhemin Li, Shiwei Xu, Sridhar Komarneni
Gas sensors based on reduced graphene oxide (rGO) films and rGO/MoS2 hybrid films were fabricated on polyethylene naphthalate (PEN) substrates by a simple self-assembly method, which yielded flexible devices for detection of formaldehyde (HCHO) at room temperature. The sensing test results indicated that the rGO and rGO/MoS2 sensors were highly sensitive and fully recoverable to ppm-level of HCHO. The bending and fatigue test results revealed that the sensors were also mechanically robust, durable and effective for long-term...
June 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28615650/experimental-design-approach-for-deposition-optimization-of-rf-sputtered-chalcogenide-thin-films-devoted-to-environmental-optical-sensors
#16
E Baudet, M Sergent, P Němec, C Cardinaud, E Rinnert, K Michel, L Jouany, B Bureau, V Nazabal
The development of the optical bio-chemical sensing technology is an extremely important scientific and technological issue for diagnosis and monitoring of diseases, control of industrial processes, environmental detection of air and water pollutants. Owing to their distinctive features, chalcogenide amorphous thin films represent a keystone in the manufacture of middle infrared integrated optical devices for a sensitive detection of biological or environmental variations. Since the chalcogenide thin films characteristics, i...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614602/uv-ozone-interfacial-modification-in-organic-transistors-for-high-sensitivity-no2-detection
#17
Wei Huang, Xinming Zhuang, Ferdinand S Melkonyan, Binghao Wang, Li Zeng, Gang Wang, Shijiao Han, Michael J Bedzyk, Junsheng Yu, Tobin J Marks, Antonio Facchetti
A new type of nitrogen dioxide (NO2 ) gas sensor based on copper phthalocyanine (CuPc) thin film transistors (TFTs) with a simple, low-cost UV-ozone (UVO)-treated polymeric gate dielectric is reported here. The NO2 sensitivity of these TFTs with the dielectric surface UVO treatment is ≈400× greater for [NO2 ] = 30 ppm than for those without UVO treatment. Importantly, the sensitivity is ≈50× greater for [NO2 ] = 1 ppm with the UVO-treated TFTs, and a limit of detection of ≈400 ppb is achieved with this sensing platform...
June 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28613302/all-soft-battery-free-and-wireless-chemical-sensing-platform-based-on-liquid-metal-for-liquid-and-gas-phase-voc-detection
#18
Min-Gu Kim, Hommood Alrowais, Choongsoon Kim, Pyungwoo Yeon, Maysam Ghovanloo, Oliver Brand
Lightweight, flexible, stretchable, and wireless sensing platforms have gained significant attention for personal healthcare and environmental monitoring applications. This paper introduces an all-soft (flexible and stretchable), battery-free, and wireless chemical microsystem using gallium-based liquid metal (eutectic gallium-indium alloy, EGaIn) and poly(dimethylsiloxane) (PDMS), fabricated using an advanced liquid metal thin-line patterning technique based on soft lithography. Considering its flexible, stretchable, and lightweight characteristics, the proposed sensing platform is well suited for wearable sensing applications either on the skin or on clothing...
June 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28613299/cellulose-gold-nanoparticle-hybrid-materials
#19
REVIEW
Jonas Van Rie, Wim Thielemans
Cellulose and gold nanoparticles have exciting characteristics and new combinations of both materials may lead to promising functional nanocomposites with unique properties. We have reviewed current research on cellulose-gold nanoparticle composite materials, and we present an overview of the preparation methods of cellulose-gold composite materials and discuss their applications. We start with the nanocomposite fabrication methods, covering in situ gold reduction, blending, and dip-coating methods to prepare gold-cellulose nanocomposite hybrids...
June 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28613289/exploration-of-organic-inorganic-hybrid-perovskites-for-surface-enhanced-infrared-spectroscopy-of-small-molecules
#20
Jia Chen, Zhi-Hong Mo, Xiao Yang, Hai-Ling Zhou, Qin Gao
The organic-inorganic hybrid perovskites efficiently enhance the infrared absorption of small molecules. It is suggested that the quantum wells of perovskites enable the electrons of the perovskites to be excited by light in the infrared region. The exploration has opened a new path for chemical sensing through infrared spectroscopy.
June 22, 2017: Chemical Communications: Chem Comm
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