منابع مشابه
Cxli. the Technique of Glass Electrode Measurements
IN the course of an investigation into the value of the glass electrode as a means of making continuous records of the hydrogen ion concentration of circulating blood, it was found, in the preliminary experiments in which estimations were made on single samples, that there were several sources of serious error. The difficulties encountered in devising a satisfactory apparatus for measuring glas...
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The Graham Steell murmur of relative pulmonary regurgitation has been reassessed using a direct technique involving injection of ascorbic acid into the pulmonary artery by needle puncture and sensing with a platinum electrode in the right ventricle. When this technique was used in 5 cases of suspected Graham Steell murtnur, pulmonary regurgitation was found in all 5, while aortic regurgitation ...
متن کاملTechnique for chronic electrode or cannula implantation in decorticate animals.
A surgical technique is described which enables chronic recording of electrophysiological activity and chemical or electrical stimulation in the decorticated animal. This procedure circumvents the problems of inadequate electrode/cannula patency and of the short-term debilitating consequences of cortical ablation. These features make it possible to analyze the relationships between neuroelectr...
متن کاملThe "double-collar" technique for EEG electrode preparation and placement.
For accurate and reliable EEG recording, electrode resistances must be kept relatively low and constant. To ensure that these conditions are met, a fixing agent, collodian, is usually used to fix the electrodes 6rmly to the scalp. Collodian, however, produces m y unwanted side effects. A “double-collar” method of electrode placement is described whereby electrodes may be fumly fixed to the scal...
متن کاملThe impact of electrode resistance on the biogalvanic characterisation technique
Measurement of a tissue-specific electrical resistance may offer a discriminatory metric for evaluation of tissue health during cancer surgery. With a move toward minimally-invasive procedures, applicable contact sensing modalities must be scalable, fast and robust. A passive resistance characterisation method utilising a biogalvanic cell as an intrinsic power source has been proposed as a pote...
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ژورنال
عنوان ژورنال: Experientia
سال: 1980
ISSN: 0014-4754,1420-9071
DOI: 10.1007/bf01969579