SliK, a K+ channel encoded by the Streptomyces KcsA gene, was expressed, purified, and reconstituted in liposomes. A concentrative 86Rb+ flux assay was used to assess the ion transport properties of SliK. SliK-mediated ionic flux shows strong selectivity for K+ over Na+ and is inhibited by micromolar concentrations of Ba2+, mirroring the basic permeation characteristic of eukaryotic K+ channels...

We propose a method based on the K-means algorithm to recover correlated areas from MEG/EEG reconstructions at the source level. We use a mixt distance based on both anatomical and functional information in order to parcellise the cortex in several areas. We restrict our distance so that parcels are always of small extent and low dimensionality, and so that local correlations can be computed mo...

Thaddeus Tarpey and Eva Petkova 1 Department Mathematics and Statistics, Wright State University, Dayton, Ohio 45435, [email protected]. 2 Department of Child and Adolescent Psychiatry, New York University, New York, NY 10016-6023 Abstract Cluster analysis is a powerful tool for discovering sources of heterogeneity in data. However, clinically interesting sources of heterogeneity, such...

We present an algorithm for finding a system of recurrence relations for the number of k-ary words of length n that satisfy a certain set of conditions. A rewriting of these relations automatically gives a system of functional equations satisfied by the multivariate generating function that counts k-ary words by their length and the indices of the corresponding recurrence relations. We propose ...

The purpose of this paper is twofold. First we derive theoretically, using appropriate transformation on x(n), the closed-form solution of the nonlinear difference equation x(n+1) = 1/(±1 + x(n)), n ∈ N_0. The form of solution of this equation, however, was first obtained in [10] but through induction principle. Then, with the solution of the above equation at hand, we prove a case ...