30 research outputs found
(R.R.) Holloway The archaeology of ancient Sicily.London: Routledge, 1991. Pp. xx + 211 + maps + illus. £45.
Integration of Central and Peripheral Respiratory Chemoreflexes
AnesthesiologyPerioperative Medicine: Efficacy, Safety and Outcom
Egypt's export diversification Benefits and constraints
SIGLELD:9349.04(60) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Simultaneous multisite recordings and stimulation of single isolated leech neurons using planar extracellular electrode arrays
Planar extracellular electrode arrays provide a non-toxic, non-invasive method of making long-term, multisite recordings with moderately high spatial frequency (recording sites per unit area). This paper reports advances in the use of this approach to record from and stimulate single identified leech neurons in vitro. A modified enzyme treatment allowed identified neurons to be extracted with very long processes. Multisite extracellular recordings from the processes of such isolated neurons revealed both the velocity and direction of action potential propagation. Propagation in two cell types examined was from the broken stump towards the cell body (antidromic). This was true for spontaneous action potentials, action potentials produced by injecting current into the cell body and extracellular stimulation of the extracted process via a planar extracellular electrode. These results extend previous findings which have shown that the tip of the broken stump of extracted neurons has a high density of voltage-activated sodium channels. Moreover they demonstrate the applicability of extracellular electrode arrays for recording the electrical excitability of single cells