In the cochlea, endolymph is a K-rich and Na-poor fluid. The purpose of the present study was to check the presence and to assess the role of epithelial Na channel (ENaC) in this organ. alpha-, beta-, and gamma-ENaC subunit mRNA, and proteins were detected in rat cochlea by RT-PCR and Western blot. alpha-ENaC subunit mRNA was localized by in situ hybridization in both epithelial (stria vascular...

The complex, so called meandering, dynamics of spiral waves in excitable media is examined from the point of view of bifurcation theory. A computational bifurcation analysis is made of spiral dynamics. It is shown that spiral meandering is organized in parameter space around a codimension-two point where a Hopf bifurcation from rotating waves interacts with symmetries on the plane. A simple mod...

Spiral Architecture is a relatively new and powerful approach to general purpose machine vision system. Using Spiral Multiplication and Spiral Addition, two special mathematical operations on Spiral Architecture, a uniform image partitioning method was proposed earlier. In this paper, preliminary research of image compression based on such a novel image partitioning is presented. It is demonstr...

Spiral Architecture is a relatively new and powerful approach to general purpose machine vision system. Using Spiral Multiplication and Spiral Addition, two special mathematical operations on Spiral Architecture, a uniform image partitioning method was proposed earlier. In this paper, preliminary research of image compression based on such a novel image partitioning is presented. It is demonstr...

Existence of the theoretically predicted spiral waves of excitation in intact two-dimensional networks of excitable elements has been experimentally confirmed in the isolated chicken retina. The preparation supports the waves of Leão's spreading depression (SD) the concentric propagation of which from the point of origin can be directly observed as a change of the optical properties of the reti...

The purpose of this study is to understand the effect of pitch on raw data interpolation in multislice spiral/helical computed tomography (CT) and provide guidelines for scanner design and protocol optimization. Multislice spiral CT is mainly characterized by the three parameters: the number of detector arrays, the detector collimation, and the table increment per x-ray source rotation. The pit...

Evidence from summation near threshold psychophysical experiments using compound Glass patterns is presented which supports the existence of mechanisms in the human visual system tuned for coherence in radial and concentric, and +45 degrees and -45 degrees spiral orientations. It is suggested that sensitivity to +45 degrees and -45 degrees logarithmic spirals serves to disambiguate the sense of...

We investigate recent claims that the Hubble sequence of spiral galaxies is scale-free. Fundamental to this investigation is the fact that within the photometric data of 86 spiral galaxies from de Jong & van der Kruit (1994) from which these claims were made a trend exists between morphological type and bulge profile shape. While late-type spiral bulges are described by an exponential luminosit...

We describe new methods for the construction of spiral toolpaths for high-speed machining. In the simplest case, our method takes a polygon as input and a number δ > 0 and returns a spiral starting at a central point in the polygon, going around towards the boundary while morphing to the shape of the polygon. The spiral consists of linear segments and circular arcs, it is G continuous, it has n...