An important question in the analysis of the electrical activity of a large population of neurons is the detection of families of neurons having a similar pattern of electrical activity, so that the original neuronal network can be decomposed into distinct clusters. This paper describes how it is possible to segment the activity of a neuronal network into clusters of sites with similar patterns of activity. Such a segmentation gives insight on how the network is organized, on how it functions and on its behavior as a dynamical system. Simulation and experiments on real data suggest that the correct approach to solve these problems must use multiresolution analysis. The method has been applied to both synthetic data and real data coming from a network of dissociated cortical neurons from neonatal rat brain.

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A new surgical procedure for aged burn victims: applications of dermolipectomy for burn wounds and donor sites.

A new surgical method for use on both burn wounds and donor sites of elderly patients with burns is presented. This procedure is based on dermolipectomy. During the period from January 1985 to December 1988, 20 operations were performed on 18 patients. This procedure was applied to 39 donor sites and to four burn wound sites. The most common donor site was the lateral trunk. There was only one postoperative death. Actual survival rates and predicted survival rates were compared, and in those patients with burns over 21% to 40% of total body surface area actual survival rates were better than the predicted rates.

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