Posterior antebrachial cutaneous nerve conduction studies in normal subjects
CLINICAL NEUROPHYSIOLOGY
Authors: Prakash, KM; Leoh, TH; Dan, YF; Nurjannah, S; Tan, YE; Xu, LQ; Lo, YL
Abstract
Objective: The posterior antebrachial cutaneous (PABC) nerve is a sensory nerve that branches out from the radial nerve at the level of the spiral groove. Thus it can be affected in a radial nerve lesion at or proximal to its origin in the spiral groove. However, there has been limited knowledge about the normal values of PABC nerve conduction studies. This study was done to determine these normal values. Methods: Sixty-three healthy adults (23 males) with a mean age of 41.5 +/- 10.6 (range, 20-90) years were recruited with informed consent. A total of 126 nerves were studied. The nerve conduction studies were performed using a Dantec Counterpoint EMG machine (Dantec, Skovlunde, Denmark). Results: The mean standard deviation values for the onset as well as peak latency, conduction velocity, amplitude and side-to-side amplitude ratio were 2.07 +/- 0.16 (range, 1.80-2.60) ms, 2.35 +/- 0.15 (range, 2.05-2.90) ms, 58.21 +/- 4.29 (range, 46.15-66.67) m/s, 6.10 +/- 2.11 (range, 2.90-13.00) muV and 0.83 +/- 0.12 (range, 0.60-0.99), respectively. There was a significant correlation between the subject age and the PABC onset and peak latencies as well as the amplitudes. Conclusions: The PABC nerve is assessable for nerve conduction studies and these normal values may be useful in evaluation of patients with suspected radial nerve lesions. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
Investigation of thermoelectric parameters of solid solutions Pb1-xSnxTe < Cd > and determination of their applications
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Authors: Aroutiounian, VM; Vahanyan, AI; Baghiyan, EM; Yepremyan, AO; Abrahamian, YA
Abstract
A new modified Bridgman method of the growth of volumetric solid solutions of the A(4)B(6) compounds is developed. Experimental investigations of thermoelectric parameters of four compositions, grown by the mentioned method, are carried out. The iso-structural transition for all compositions at T 300 K in the form of sharp peak in the electrical conductivity was observed, its explanation is given. High values of thermal e.m.f. coefficient (400-450 muV/K) have detected for the n-Pb1-xSnxTe(Cd) samples. On the basis of experimental data and calculations, it is shown that there is enough wide temperature range, where the mentioned high values kept save. It opens possibilities to use these materials as sensors of thermal radiation. It is shown that due to features of band structure, under certain conditions, it is possible to increase the efficiency of the p-Pb1-xSnxTe(Cd) composition up to 4 x 10(-3) to 6 x 10(-3) K-1. (C) 2003 Elsevier B.V. All rights reserved.