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Fast scan cyclic voltammetry

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https://www.readbyqxmd.com/read/27919729/noradrenergic-modulation-of-evoked-dopamine-release-and-ph-shift-in-the-mouse-dorsal-hippocampus-and-ventral-striatum
#1
Adam Z Weitemier, Thomas J McHugh
Rapid monoamine release in the dorsal hippocampus is not well characterized, despite its postulated role in modulating fast hippocampal circuit dynamics. We measured monoamine release in the dorsal hippocampus upon stimulation of the ventral tegmental area (VTA) with fast-scan cyclic voltammetry in anesthetized norepinephrine-depleted and non-depleted mice. Within the hippocampus, norepinephrine depletion altered the ability of α2 adrenergic compounds and transporter blockers to modulate the small, evoked monoamine signal...
December 2, 2016: Brain Research
https://www.readbyqxmd.com/read/27916553/nio-hedgehog-like-nanostructures-au-polyaniline-nanofibers-reduced-graphene-oxide-nanocomposite-with-electrocatalytic-activity-for-non-enzymatic-detection-of-glucose
#2
Kh Ghanbari, F Ahmadi
A novel sensitive non-enzymatic glucose sensor was fabricated based on nickel oxide hedgehog-like nanostructures decorated ternary gold nanoparticles/polyaniline nanofibers/reduced graphene oxide nanocomposites (NiO/Au/PANI/rGO). The morphology and structure of NiO/Au/PANI/rGO nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FT-IR). Electrochemical impedance spectroscopy (EIS) data also indicated the charge transfer of each layer decreased compared to the underneath layer...
December 1, 2016: Analytical Biochemistry
https://www.readbyqxmd.com/read/27900618/3d-carbon-nanofiber-microelectrode-arrays-fabricated-by-plasma-assisted-pyrolysis-to-enhance-sensitivity-and-stability-of-real-time-dopamine-detection
#3
Wenwen Yi, Yuanyuan Yang, Parastoo Hashemi, Mark Ming-Cheng Cheng
In this paper, we have fabricated 3D carbon nanofiber microelectrode arrays (MEAs) with highly reproducible and rich chemical surface areas for fast scan cyclic voltammetry (FSCV). Carbon nanofibers are created from negative photoresist by a new process called dual O2 plasma-assisted pyrolysis. The proposed approach significantly improves film adhesion and increases surface reactivity. We showcase our sensor's compatibility with FSCV analysis by demonstrating highly sensitive and stable FSCV dopamine measurements on a prototype 4-channel array...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27845670/an-electrochemical-ph-sensor-based-on-the-amino-functionalized-graphene-and-polyaniline-composite-film
#4
Wenqiong Su, Jiamei Xu, Xianting Ding
Conventional glass-based pH sensors are usually fragile and space consuming. Herein, a miniature electrochemical pH sensor based on amino-functionalized graphene fragments and polyaniline (NH2-G/PANI) composite film is developed via simply one-pot electrochemical polymerization on the ITO-coated glass substrates. Cyclic Voltammetry (CV), Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Raman Spectra are involved to confirm the successful synthesis and to characterize the properties of the NH2-G/PANI composite film...
November 7, 2016: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/27844054/subsecond-sensory-modulation-of-serotonin-levels-in-a-primary-sensory-area-and-its-relation-to-ongoing-communication-behavior-in-a-weakly-electric-fish
#5
Haleh Fotowat, Erik Harvey-Girard, Joseph F Cheer, Rüdiger Krahe, Leonard Maler
Serotonergic neurons of the raphe nuclei of vertebrates project to most regions of the brain and are known to significantly affect sensory processing. The subsecond dynamics of sensory modulation of serotonin levels and its relation to behavior, however, remain unknown. We used fast-scan cyclic voltammetry to measure serotonin release in the electrosensory system of weakly electric fish, Apteronotus leptorhynchus. These fish use an electric organ to generate a quasi-sinusoidal electric field for communicating with conspecifics...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27822508/clozapine-n-oxide-administration-produces-behavioral-effects-in-long-evans-rats-implications-for-designing-dreadd-experiments
#6
Duncan A A MacLaren, Richard W Browne, Jessica K Shaw, Sandhya Krishnan Radhakrishnan, Prachi Khare, Rodrigo A España, Stewart D Clark
Clozapine N-oxide (CNO) is a ligand for a powerful chemogenetic system that can selectively inhibit or activate neurons; the so-called Designer Receptors Exclusively Activated by Designer Drugs (DREADD) system. This system consists of synthetic G-protein-coupled receptors, which are not believed to be activated by any endogenous ligand, but are activated by the otherwise inert CNO. However, it has previously been shown that the administration of CNO in humans and rats leads to detectable levels of the bioactive compounds clozapine and N-desmethylclozapine (N-Des)...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27808288/fast-voltammetry-of-metals-at-carbon-fiber-microelectrodes-towards-an-online-speciation-sensor
#7
Pavithra Pathirathna, Thushani Siriwardhane, Shawn P McElmurry, Stephen L Morgan, Parastoo Hashemi
Speciation controls the chemical behavior of trace metals. Thus, there is great demand for rapid speciation analysis in a variety of fields. In this study, we describe the application of fast scan cyclic voltammetry (FSCV) and fast scan adsorption controlled voltammetry (FSCAV) to trace metal speciation analysis. We show that Cu(2+) can be detected using FSCAV in different matrices. We find that matrices with different Cu(2+) binding ability do not affect the equilibrium of Cu(2+) adsorption onto CFMs, and thus are an excellent predictor for free Cu(2+) ([Cu(2+)]free) in solution...
November 3, 2016: Analyst
https://www.readbyqxmd.com/read/27774784/monitoring-in-vivo-changes-in-tonic-extracellular-dopamine-level-by-charge-balancing-multiple-waveform-fast-scan-cyclic-voltammetry
#8
Yoonbae Oh, Cheonho Park, Do Hyoung Kim, Hojin Shin, Yu Min Kang, Mark DeWaele, Jeyeon Lee, Hoon-Ki Min, Charles D Blaha, Kevin Bennet, In Young Kim, Kendall H Lee, Dong Pyo Jang
Dopamine (DA) modulates central neuronal activity through both phasic (second to second) and tonic (minutes to hours) terminal release. Conventional fast-scan cyclic voltammetry (FSCV), in combination with carbon fiber microelectrodes, has been used to measure phasic DA release in vivo by adopting a background subtraction procedure to remove background capacitive currents. However, to-date, measuring tonic changes in DA concentrations using conventional FSCV has been difficult because background capacitive currents are inherently unstable over long recording periods...
October 24, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27752541/terminal-dopamine-release-kinetics-in-the-accumbens-core-and-shell-are-distinctly-altered-after-withdrawal-from-cocaine-self-administration
#9
Michael P Saddoris
Repeated self-administration of cocaine is associated with impairments in motivated behaviors as well as alterations in both dopamine (DA) release and neural signaling within the nucleus accumbens (NAc). These impairments are present even after several weeks of abstinence from drug taking, suggesting that the self-administration experience induces long-lasting neuroplastic alterations in the mesolimbic DA circuit. To understand these changes at the terminal level, rats were allowed to self-administer either cocaine intravenously (∼1 mg/kg per infusion) or water to a receptacle (control) in 2-h sessions over 14 days, followed by 30 days of enforced abstinence...
September 2016: ENeuro
https://www.readbyqxmd.com/read/27733628/modafinil-activates-phasic-dopamine-signaling-in-dorsal-and-ventral-striata
#10
Martin J Bobak, Matthew W Weber, Melissa A Doellman, Douglas R Schuweiler, Jeana M Athens, Steven A Juliano, Paul A Garris
Modafinil (MOD) exhibits therapeutic efficacy for treating sleep and psychiatric disorders, but its mechanism is incompletely understood. Compared to other psychostimulants inhibiting dopamine (DA) uptake, MOD weakly interacts with the dopamine transporter (DAT) and modestly elevates striatal dialysate DA, suggesting additional targets besides DAT. However, the ability of MOD to induce wakefulness is abolished with DAT knockout, conversely suggesting that DAT is necessary for MOD action. Another psychostimulant target, but one not established for MOD, is activation of phasic DA signaling...
October 12, 2016: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/27722568/detection-of-evoked-acetylcholine-release-in-mouse-brain-slices
#11
R Asri, B O'Neill, J C Patel, K A Siletti, M E Rice
The study of transmitter interactions in reward and motor pathways in the brain, including the striatum, requires methodology to detect stimulus-driven neurotransmitter release events. Such methods exist for dopamine, and have contributed to the understanding of local and behavioral factors that regulate dopamine release. However, factors that regulate release of another key transmitter in these pathways, acetylcholine (ACh), are unresolved, in part because of limited temporal and spatial resolution of current detection methods...
October 3, 2016: Analyst
https://www.readbyqxmd.com/read/27711862/electrochemistry-at-single-bimetallic-nanoparticles-using-nano-impacts-for-sizing-and-compositional-analysis-of-individual-agau-alloy-nanoparticles
#12
En Ning Saw, Viktoria Grasmik, Christian Rurainsky, Matthias Epple, Kristina Tschulik
The increasing interest in producing bimetallic nanoparticles and utilizing them in modern technologies sets the demand for fast and affordable characterization of these materials. To date Scanning Transmission Electron Microscopy (STEM) coupled to energy dispersive X-ray spectroscopy is usually used to determine the size and composition of alloy nanoparticles, which is time-consuming and expensive. Here electrochemical single nanoparticle analysis is presented as an alternative approach to infer the particle size and composition of alloy nanoparticles, directly in a dispersion of these particles...
September 15, 2016: Faraday Discussions
https://www.readbyqxmd.com/read/27622391/glucose-biosensor-based-on-functionalized-zno-nanowire-graphite-films-dispersed-on-a-pt-electrode
#13
P Gallay, E Tosi, R Madrid, M Tirado, D Comedi
We present a glucose biosensor based on ZnO nanowire self-sustained films grown on compacted graphite flakes by the vapor transport method. Nanowire/graphite films were fragmented in water, filtered to form a colloidal suspension, subsequently functionalized with glucose oxidase and finally transferred to a metal electrode (Pt). The obtained devices were evaluated using scanning electron microscopy, energy-dispersive x-ray spectroscopy, cyclic voltammetry and chronoamperometry. The electrochemical responses of the devices were determined in buffer solutions with successive glucose aggregates using a tripolar electrode system...
October 21, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27617735/medullary-norepinephrine-projections-release-norepinephrine-into-the-contralateral-bed-nucleus-of-the-stria-terminalis
#14
Megan E Fox, Elizabeth S Bucher, Justin A Johnson, R Mark Wightman
Central norepinephrine signaling influences a wide range of behavioral and physiological processes, and the ventral bed nucleus of the stria terminalis (vBNST) receives some of the densest norepinephrine innervation in the brain. Previous work describes norepinephrine neurons as projecting primarily unilaterally; however, recent evidence for cross-hemispheric catecholamine signaling challenges this idea. Here, we use fast-scan cyclic voltammetry and retrograde tracing to characterize cross-hemispheric norepinephrine signaling in the vBNST...
September 27, 2016: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/27616984/ventral-midbrain-nmda-receptor-blockade-from-enhanced-reward-and-dopamine-inactivation
#15
Giovanni Hernandez, Marie-Pierre Cossette, Peter Shizgal, Pierre-Paul Rompré
Glutamate stimulates ventral midbrain (VM) N-Methyl-D-Aspartate receptors (NMDAR) to initiate dopamine (DA) burst firing activity, a mode of discharge associated with enhanced DA release and reward. Blockade of VM NMDAR, however, enhances brain stimulation reward (BSR), the results can be explained by a reduction in the inhibitory drive on DA neurons that is also under the control of glutamate. In this study, we used fast-scan cyclic voltammetry (FSCV) in anesthetized animals to determine whether this enhancement is associated with a change in phasic DA release in the nucleus accumbens...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27616012/one-month-of-cocaine-abstinence-potentiates-rapid-dopamine-signaling-in-the-nucleus-accumbens-core
#16
Courtney M Cameron, R Mark Wightman, Regina M Carelli
Cocaine addiction is a chronic relapsing disorder that is difficult to treat in part because addicts relapse even after extended periods of abstinence. Given the importance of the mesolimbic dopamine (DA) system in drug addiction, we sought to characterize cocaine abstinence induced changes in rapid DA signaling in the nucleus accumbens (NAc). Here, rats were trained to self-administer cocaine for 14 consecutive days, then divided into two groups. Day 1 rats (D1; n = 7) underwent 24 h of abstinence; Day 30 rats (D30; n = 7) underwent one month of abstinence...
December 2016: Neuropharmacology
https://www.readbyqxmd.com/read/27597763/spatial-and-activity-dependent-catecholamine-release-in-rat-adrenal-medulla-under-native-neuronal-stimulation
#17
Kyle Wolf, Georgy Zarkua, Shyue-An Chan, Arun Sridhar, Corey Smith
Neuroendocrine chromaffin cells of the adrenal medulla in rat receive excitatory synaptic input through anterior and posterior divisions of the sympathetic splanchnic nerve. Upon synaptic stimulation, the adrenal medulla releases the catecholamines, epinephrine, and norepinephrine into the suprarenal vein for circulation throughout the body. Under sympathetic tone, catecholamine release is modest. However, upon activation of the sympathoadrenal stress reflex, and increased splanchnic firing, adrenal catecholamine output increases dramatically...
September 2016: Physiological Reports
https://www.readbyqxmd.com/read/27574306/bold-and-its-connection-to-dopamine-release-in-human-striatum-a-cross-cohort-comparison
#18
Terry Lohrenz, Kenneth T Kishida, P Read Montague
Activity in midbrain dopamine neurons modulates the release of dopamine in terminal structures including the striatum, and controls reward-dependent valuation and choice. This fluctuating release of dopamine is thought to encode reward prediction error (RPE) signals and other value-related information crucial to decision-making, and such models have been used to track prediction error signals in the striatum as encoded by BOLD signals. However, until recently there have been no comparisons of BOLD responses and dopamine responses except for one clear correlation of these two signals in rodents...
October 5, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/27566978/cortical-control-of-striatal-dopamine-transmission-via-striatal-cholinergic-interneurons
#19
Polina Kosillo, Yan-Feng Zhang, Sarah Threlfell, Stephanie J Cragg
Corticostriatal regulation of striatal dopamine (DA) transmission has long been postulated, but ionotropic glutamate receptors have not been localized directly to DA axons. Striatal cholinergic interneurons (ChIs) are emerging as major players in striatal function, and can govern DA transmission by activating nicotinic receptors (nAChRs) on DA axons. Cortical inputs to ChIs have historically been perceived as sparse, but recent evidence indicates that they strongly activate ChIs. We explored whether activation of M1/M2 corticostriatal inputs can consequently gate DA transmission, via ChIs...
August 27, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27548680/dopamine-dynamics-during-continuous-intracranial-self-stimulation-effect-of-waveform-on-fast-scan-cyclic-voltammetry-data
#20
Nathan T Rodeberg, Justin A Johnson, Elizabeth S Bucher, R Mark Wightman
The neurotransmitter dopamine is heavily implicated in intracranial self-stimulation (ICSS). Many drugs of abuse that affect ICSS behavior target the dopaminergic system, and optogenetic activation of dopamine neurons is sufficient to support self-stimulation. However, the patterns of phasic dopamine release during ICSS remain unclear. Early ICSS studies using fast-scan cyclic voltammetry (FSCV) rarely observed phasic dopamine release, which led to the surprising conclusion that it is dissociated from ICSS...
September 1, 2016: ACS Chemical Neuroscience
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