نتایج جستجو برای: amperometry
تعداد نتایج: 456 فیلتر نتایج به سال:
Introduction: Catecholamines are charged neurotransmitters found in the neuroendocrine cells called chromaffins. The release of catecholamine, through a narrow fusion pore of a chromaffin cell requires a charge compensation by other ions to maintain an osmotic balance of charges. The aim of this research is to show that the exocytotic catecholamine release is not associated with the cation flux...
Halloysite is naturally occurring nanotubular clay with a phyllosilicate structure and widely used as solid support to modify various redox mediators. We prepared hemin modified halloysite (Hemin/HNT) by simple impregnation method, in which known amount of was dispersed ethanolic solution 1% reacted for 12 h. The resulting pure Hemin/HNT employed electrocatalyst the electrochemical oxidation ni...
The combination of hydrodynamic focusing with embedded capillaries in a microfluidic device is shown to enable both surface enhanced Raman scattering (SERS) and electrochemical characterization of analytes at nanomolar concentrations in flow. The approach utilizes a versatile polystyrene device that contains an encapsulated microelectrode and fluidic tubing, which is shown to enable straightfor...
Chromogranins/secretogranins (Cgs) are the major soluble proteins of large dense-core secretory vesicles (LDCVs). We have recently reported that the absence of chromogranin A (CgA) caused important changes in the accumulation and in the exocytosis of catecholamines (CAs) using a CgA-knock-out (CgA-KO) mouse. Here, we have analyzed a CgB-KO mouse strain that can be maintained in homozygosis. The...
Electric detection using a nanocomponent may lead to platforms for rapid and simple biosensing. Sensors composed of nanotips or nanodots have been described for highly sensitive amperometry enabled by confined geometry. However, both fabrication and use of nanostructured sensors remain challenging. This paper describes a dendritic nanotip used as an amperometric biosensor for highly sensitive d...
Voltammetric (electrochemical) methodologies such as differential pulse voltammetry and amperometry used together with electrically and chemically treated carbon fibre micro-electrodes (mCFE) allow selective monitoring of nitric oxide (NO). Preliminary in vitro studies have shown that the selective serotonin reuptake inhibitor (SSRI) antidepressant paroxetine inhibits constitutive nitric oxide ...
The Venus flytrap Dionaea muscipula captures insects and consumes their flesh. Prey contacting touch-sensitive hairs trigger traveling electrical waves. These action potentials (APs) cause rapid closure of the trap and activate secretory functions of glands, which cover its inner surface. Such prey-induced haptoelectric stimulation activates the touch hormone jasmonate (JA) signaling pathway, w...
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