a fiber coating from polyaniline (pani) was electrochemically prepared and employed for solid phase micreoextraction (spme). the pani film was directly electrodeposited on the platinum wire surface using cyclic voltametry (cv) technique. the same method was applied for the preparation of spme fiber coated by polyaniline multiwalled carbon nanotubes (pani/mwcnts) composite. the concentration of ...

Efficient and selective electrical stimulation and recording of neural activity in peripheral, spinal, or central pathways requires multielectrode arrays at micrometer scale. At present, wire arrays in brain, flexible linear arrays in the cochlea and cuff arrays around nerve trunks are in experimental and/or clinical use. Twoand three-dimensional brush-like arrays and sieve arrays, with around ...

OBJECTIVE One patient with severe heart failure (LV 92 mm, EF 28%) was treated by cardiac resynchronization therapy (CRT). METHOD During the operation, it was found that double superior vena cava coexisted, and selective coronary venography cannot clearly show every branch. It was difficult to push ventriculus sinister electrode to sideward vein, so the electrode was released to far end of fr...

  Objective: Corrosion resistance is among the most important properties of metal alloys used in the oral cavity. Consumption of acidic foods reduces the salivary pH and intensifies the corrosion of brackets and orthodontic wires. This study aimed to compare electro galvanic corrosion of different orthodontic brackets and wires and determine the amount of ions released into acidic artifici...

Wireless electroencephalography (EEG) of small animal subjects typically utilizes miniaturized EEG devices which require a robust recording and electrode assembly that remains in place while also being well-tolerated by the animal so as not to impair the ability of the animal to perform normal living activities or experimental tasks. We developed simple and fast electrode assembly and method of...

New polymeric membrane (PME), modified carbon paste (MCPE), and coated wire (CWE) selenite ion-selective electrodes based on 5,10,15,20-tetrakis-(4-methoxyphenyl)-21H,23H-porphyrin-Co(II) (CoTMeOPP) are reported. The best composition was the electrode containing 2% CoTMeOPP as the active material and 49% TCP as plasticizer. The electrodes reveal a Nernstian behavior over a concentration range o...

As an alternative to the usual commercial reference and quasi-reference electrodes (QREs), we propose metal (Pt, stainless steel) coated with partially oxidized polypyrrole as a QRE. The electrode is easily fabricated by cyclic voltammetry (CV) with the metal electrode in an acetonitrile or CH2Cl2 solution of 10 mM pyrrole containing 0.1 M Bu4NPF6. These QREs were more stable than the widely us...

A simple, accurate and precise potentiometric method was developed for the determination of gemifloxacin mesylate (GFX). Three ion selective coated wire sensors have been constructed from the incorporation of (GFX) with the ion-pairing agents phosphotungstic acid (PTA), phosphomolybdic acid (PMA) and Ammonium reineckate salt (ARS). The three sensors show nearly Nernestian response over the conc...

The recording interface between neurons and an implanted microelectrode recording site is often compromised due to gliosis, rendering the implant non-functional under chronic conditions. The objective of this project is to design novel microelectrodes that will minimize gliosis under chronic implantation. We test the hypothesis that gliosis can be minimized or eliminated by reducing the cross-s...