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https://www.readbyqxmd.com/read/28186213/multifunctional-biocompatible-and-ph-responsive-carbon-nanotube-and-graphene-oxide-tectomer-hybrid-composites-and-coatings
#1
Rosa Garriga, Izabela Jurewicz, Shayan Seyedin, Niki Bardi, Stella Totti, Brigitta Matta-Domjan, Eirini G Velliou, Mohammed A Alkhorayef, Vicente L Cebolla, Joselito M Razal, Alan B Dalton, Edgar Muñoz
Here we present a route for non-covalent functionalization of carboxylated multi-walled carbon nanotubes and graphene oxide with novel two-dimensional peptide assemblies. We show that self-assembled amino-terminated biantennary and tetraantennary oligoglycine peptides (referred to as tectomers) effectively coat carboxylated multi-walled carbon nanotubes and also strongly interact with graphene oxide due to electrostatic interactions and hydrogen bonding as the driving force, respectively. The resulting hybrids can be made into free-standing conducting composites or applied in the form of thin, pH-switchable bioadhesive coatings onto graphene oxide fibers...
February 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28181720/organic-bioelectronics-in-medicine
#2
S Löffler, K Melican, K P R Nilsson, A Richter-Dahlfors
A major challenge in the growing field of bioelectronic medicine is the development of tissue interface technologies promoting device integration with biological tissues. Materials based on organic bioelectronics show great promise due to a unique combination of electronic and ionic conductivity properties. In this review, we outline exciting developments in the field of organic bioelectronics and demonstrate the medical importance of these active, electronically controllable materials. Importantly, organic bioelectronics offer a means to control cell-surface attachment as required for many device-tissue applications...
February 9, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28152485/soft-conformal-bioelectronics-for-a-wireless-human-wheelchair-interface
#3
Saswat Mishra, James J S Norton, Yongkuk Lee, Dong Sup Lee, Nicolas Agee, Yanfei Chen, Youngjae Chun, Woon-Hong Yeo
There are more than 3 million people in the world whose mobility relies on wheelchairs. Recent advancement on engineering technology enables more intuitive, easy-to-use rehabilitation systems. A human-machine interface that uses non-invasive, electrophysiological signals can allow a systematic interaction between human and devices; for example, eye movement-based wheelchair control. However, the existing machine-interface platforms are obtrusive, uncomfortable, and often cause skin irritations as they require a metal electrode affixed to the skin with a gel and acrylic pad...
January 25, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28150491/electrically-controlled-sponge-effect-of-pedot-pss-governs-membrane-potential-and-cellular-growth
#4
Fabrizio Amorini, Isabella Zironi, Marco Marzocchi, Isacco Gualandi, Maria Calienni, Tobias Cramer, Beatrice Fraboni, Gastone Castellani
PSS is a highly conductive material with good thermal and chemical stability and enhanced biocompatibility that make it suitable for bioengineering applications. The electrical control of the oxidation state of PEDOT:PSS films allows modulation of peculiar physical and chemical properties of the material, such as topography, wettability, and conductivity, and thus offers a possible route for controlling cellular behavior. Through the use of (i) the electrophysiological response of the plasma membrane as a biosensor of the ionic availability; (ii) relative abundance around the cells via X-ray spectroscopy; and (iii) atomic force microscopy to monitor PEDOT:PSS film thickness relative to its oxidation state, we demonstrate that redox processes confer to PEDOT:PSS the property to modify the ionic environment at the film-liquid interface through a "sponge-like" effect on ions...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28145712/nanoscale-on-silico-electron-transport-via-ferritins
#5
Sudipta Bera, Jayeeta Kolay, Siddhartha Banerjee, Rupa Mukhopadhyay
Silicon is a solid-state semi-conducting material, which has long been recognized as a technologically useful one, especially in electronics industry. However, its application in the next-generation metalloprotein-based electronics approaches has been limited. In this work, applicability of silicon as a solid support for anchoring the iron-storage protein ferritin, which has a semiconducting iron nanocore, and probing electron transport via the ferritin molecules trapped between silicon substrate and a conductive scanning probe, has been investigated...
February 1, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28096491/expressing-the-geobacter-metallireducens-pila-in-geobacter-sulfurreducens-yields-pili-with-exceptional-conductivity
#6
Yang Tan, Ramesh Y Adhikari, Nikhil S Malvankar, Joy E Ward, Trevor L Woodard, Kelly P Nevin, Derek R Lovley
: The electrically conductive pili (e-pili) of Geobacter sulfurreducens serve as a model for a novel strategy for long-range extracellular electron transfer. e-pili are also a new class of bioelectronic materials. However, the only other Geobacter pili previously studied, which were from G. uraniireducens, were poorly conductive. In order to obtain more information on the range of pili conductivities in Geobacter species, the pili of G. metallireducens were investigated. Heterologously expressing the PilA gene of G...
January 17, 2017: MBio
https://www.readbyqxmd.com/read/28092663/neural-regulation-of-immunity-molecular-mechanisms-and-clinical-translation
#7
REVIEW
Valentin A Pavlov, Kevin J Tracey
Studies bridging neuroscience and immunology have identified neural pathways that regulate immunity and inflammation. Recent research using methodological advances in molecular genetics has improved our understanding of the neural control of immunity. Here we outline mechanistic insights, focusing on translational relevance and conceptual developments. We also summarize findings from recent clinical studies of bioelectronic neuromodulation in inflammatory and autoimmune diseases.
February 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28092361/designed-cell-consortia-as-fragrance-programmable-analog-to-digital-converters
#8
Marius Müller, Simon Ausländer, Andrea Spinnler, David Ausländer, Julian Sikorski, Marc Folcher, Martin Fussenegger
Synthetic biology advances the rational engineering of mammalian cells to achieve cell-based therapy goals. Synthetic gene networks have nearly reached the complexity of digital electronic circuits and enable single cells to perform programmable arithmetic calculations or to provide dynamic remote control of transgenes through electromagnetic waves. We designed a synthetic multilayered gaseous-fragrance-programmable analog-to-digital converter (ADC) allowing for remote control of digital gene expression with 2-bit AND-, OR- and NOR-gate logic in synchronized cell consortia...
March 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28089199/bioelectronic-nose-an-emerging-tool-for-odor-standardization
#9
REVIEW
Manki Son, Ji Youn Lee, Hwi Jin Ko, Tai Hyun Park
Odors are perceived differently as a function of individual human experience, and communicating about odors between individuals is therefore very difficult. There is a need to classify and standardize odors, but appropriate tools have not yet been developed. A bioelectronic nose mimics human olfaction and detects target molecules with high sensitivity and selectivity. This new tool has great potential in many applications and is expected to accelerate odor classification and standardization. In particular, a multiplexed bioelectronic nose can provide complex odor information using pattern recognition techniques, and could even reproduce odors via an integrated olfactory display system...
January 11, 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/28054656/fabrication-of-enzyme-based-coatings-on-intact-multi-walled-carbon-nanotubes-as-highly-effective-electrodes-in-biofuel-cells
#10
Byoung Chan Kim, Inseon Lee, Seok-Joon Kwon, Youngho Wee, Ki Young Kwon, Chulmin Jeon, Hyo Jin An, Hee-Tae Jung, Su Ha, Jonathan S Dordick, Jungbae Kim
CNTs need to be dispersed in aqueous solution for their successful use, and most methods to disperse CNTs rely on tedious and time-consuming acid-based oxidation. Here, we report the simple dispersion of intact multi-walled carbon nanotubes (CNTs) by adding them directly into an aqueous solution of glucose oxidase (GOx), resulting in simultaneous CNT dispersion and facile enzyme immobilization through sequential enzyme adsorption, precipitation, and crosslinking (EAPC). The EAPC achieved high enzyme loading and stability because of crosslinked enzyme coatings on intact CNTs, while obviating the chemical pretreatment that can seriously damage the electron conductivity of CNTs...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28030766/boosted-sensor-performance-by-surface-modification-of-bifunctional-rht-type-metal-organic-framework-with-nanosized-electrochemically-reduced-graphene-oxide
#11
Cong Li, Tingting Zhang, Jingyu Zhao, He Liu, Bo Zheng, Yue Gu, Xiaoyi Yan, Yaru Li, Nannan Lu, Zhiquan Zhang, Guodong Feng
The surface and interface could be designed to enhance properties of electrocatalysts, and they are regarded as the key characteristics. This report describes surface modification of a bifunctional rht-type metal-organic framework (MOF, Cu-TDPAT) with nanosized electrochemically reduced graphene oxide (n-ERGO). The hybrid strategy results in a Cu-TDPAT-n-ERGO sensor with sensitive and selective response toward hydrogen peroxide (H2O2). Compared with Cu-TDPAT, Cu-TDPAT-n-ERGO exhibits significantly enhanced electrocatalytic activities, highlighting the importance of n-ERGO in boosting their electrocatalytic activity...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28026927/pegylated-polyaniline-nanofibers-antifouling-and-conducting-biomaterial-for-electrochemical-dna-sensing
#12
Ni Hui, Xiaotian Sun, Shuyan Niu, Xiliang Luo
Biofouling arising from nonspecific adsorption is a substantial outstanding challenge in diagnostics and disease monitoring, and antifouling sensing interfaces capable of reducing the nonspecific adsorption of proteins from biological complex samples are highly desirable. We present herein the preparation of novel composite nanofibers through the grafting of polyethylene glycol (PEG) polymer onto polyaniline (PANI) nanofibers and their application in the development of antifouling electrochemical biosensors...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28025564/versatile-flexible-graphene-multielectrode-arrays
#13
Dmitry Kireev, Silke Seyock, Mathis Ernst, Vanessa Maybeck, Bernhard Wolfrum, Andreas Offenhäusser
Graphene is a promising material possessing features relevant to bioelectronics applications. Graphene microelectrodes (GMEAs), which are fabricated in a dense array on a flexible polyimide substrate, were investigated in this work for their performance via electrical impedance spectroscopy. Biocompatibility and suitability of the GMEAs for extracellular recordings were tested by measuring electrical activities from acute heart tissue and cardiac muscle cells. The recordings show encouraging signal-to-noise ratios of 65 ± 15 for heart tissue recordings and 20 ± 10 for HL-1 cells...
December 23, 2016: Biosensors
https://www.readbyqxmd.com/read/28002672/hybrid-nanowire-ion-to-electron-transducers-for-integrated-bioelectronic-circuitry
#14
D J Carrad, A B Mostert, A R Ullah, A M Burke, H J Joyce, H H Tan, C Jagadish, P Krogstrup, J Nygård, P Meredith, A P Micolich
A key task in the emerging field of bioelectronics is the transduction between ionic/protonic and electronic signals at high fidelity. This is a considerable challenge since the two carrier types exhibit intrinsically different physics and are best supported by very different materials types-electronic signals in inorganic semiconductors and ionic/protonic signals in organic or bio-organic polymers, gels, or electrolytes. Here we demonstrate a new class of organic-inorganic transducing interface featuring semiconducting nanowires electrostatically gated using a solid proton-transporting hygroscopic polymer...
January 5, 2017: Nano Letters
https://www.readbyqxmd.com/read/27999616/bioelectronic-nose-and-its-application-to-smell-visualization
#15
REVIEW
Hwi Jin Ko, Tai Hyun Park
There have been many trials to visualize smell using various techniques in order to objectively express the smell because information obtained from the sense of smell in human is very subjective. So far, well-trained experts such as a perfumer, complex and large-scale equipment such as GC-MS, and an electronic nose have played major roles in objectively detecting and recognizing odors. Recently, an optoelectronic nose was developed to achieve this purpose, but some limitations regarding the sensitivity and the number of smells that can be visualized still persist...
2016: Journal of Biological Engineering
https://www.readbyqxmd.com/read/27989919/electrically-conductive-graphene-polyacrylamide-hydrogels-produced-by-mild-chemical-reduction-for-enhanced-myoblast-growth-and-differentiation
#16
Hyerim Jo, Myeongbu Sim, Semin Kim, Sumi Yang, Youngjae Yoo, Jin-Ho Park, Tae Ho Yoon, Min-Gon Kim, Jae Young Lee
: Graphene and graphene derivatives, such as graphene oxide (GO) and reduced GO (rGO), have been extensively employed as novel components of biomaterials because of their unique electrical and mechanical properties. These materials have also been used to fabricate electrically conductive biomaterials that can effectively deliver electrical signals to biological systems. Recently, increasing attention has been paid to electrically conductive hydrogels that have both electrical activity and a tissue-like softness...
October 27, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27974769/the-rise-of-plastic-bioelectronics
#17
Takao Someya, Zhenan Bao, George G Malliaras
Plastic bioelectronics is a research field that takes advantage of the inherent properties of polymers and soft organic electronics for applications at the interface of biology and electronics. The resulting electronic materials and devices are soft, stretchable and mechanically conformable, which are important qualities for interacting with biological systems in both wearable and implantable devices. Work is currently aimed at improving these devices with a view to making the electronic-biological interface as seamless as possible...
December 14, 2016: Nature
https://www.readbyqxmd.com/read/27960435/fabricating-metallic-circuit-patterns-on-polymer-substrates-through-laser-and-selective-metallization
#18
Jihai Zhang, Tao Zhou, Liang Wen, Aiming Zhang
Nowadays, with the rapid development of portable electronics, wearable electronics, LEDs, microelectronics, and bioelectronics, the fabrication of metallic circuits onto polymer substrates with strong adhesion property is an ever-increasing challenge. In this study, the high-resolution and well-defined metallic circuits were successfully prepared on the polymer surface via laser direct structuring (LDS) based on copper hydroxyl phosphate [Cu2(OH)PO4], and the key mechanism of the selective metallization was systematically investigated...
December 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27934196/a-facile-approach-for-constructing-conductive-polymer-patterns-for-application-in-electrochromic-devices-and-flexible-microelectrodes
#19
Dabum Kim, Jeonghun Kim, Youngsang Ko, Kyubin Shim, Jung Ho Kim, Jungmok You
We developed a novel strategy for fabricating poly(3,4-ethylenedioxythiophene) (PEDOT) patterns on various substrates, including hydrogels, via sequential solution procedure without multistep chemical etching or lift-off processes. First, PEDOT nanothin films were prepared on a glass substrate by solution phase monomer casting and oxidative polymerization. As a second step, after UV-induced poly(ethylene glycol) (PEG) photolithography at the PEDOT/PEG interface through a photomask, the hydrogel was peeled away from the PEDOT-coated glass substrate to detach the UV-exposed PEDOT region, which left the UV nonexposed PEDOT region intact on the glass substrate, resulting in PEDOT patterns...
December 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27934112/bioelectronic-nose-using-odorant-binding-protein-derived-peptide-and-carbon-nanotube-field-effect-transistor-for-the-assessment-of-salmonella-contamination-in-food
#20
Manki Son, Daesan Kim, Jinkyung Kang, Jong Hyun Lim, Seung Hwan Lee, Hwi Jin Ko, Seunghun Hong, Tai Hyun Park
Salmonella infection is the one of the major causes of food borne illnesses including fever, abdominal pain, diarrhea, and nausea. Thus, early detection of Salmonella contamination is important for our healthy life. Conventional detection methods for the food contamination have limitations in sensitivity and rapidity; thus, the early detection has been difficult. Herein, we developed a bioelectronic nose using a carbon nanotube (CNT) field-effect transistor (FET) functionalized with Drosophila odorant binding protein (OBP)-derived peptide for easy and rapid detection of Salmonella contamination in ham...
December 6, 2016: Analytical Chemistry
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