Dictyostelium discoideum is used extensively as a model organism for the study of chemotaxis. In recent years, an increasing number of studies of Dictyostelium chemotaxis have made use of fluorescence-based techniques. One of the major factors that can interfere with the application of these techniques in cells is the cellular autofluorescence. In this study, the spectral properties of Dictyost...

Applications of nanowires into future generation nanodevices require a complete understanding of the mechanical properties of the nanowires. A great research effort has been made in the past two decades to understand the deformation physics and mechanical behaviors of nanowires, and to interpret the discrepancies between experimental measurements and theoretical predictions. This review focused...

We present a method for a complete characterization of a femtosecond ultraviolet pulse when a fundamental near-infrared beam is also available. Our approach relies on generation of second harmonic from the pre-characterized fundamental, which serves as a reference against which an unknown pulse is measured using spectral interference (SI). The characterization apparatus is a modified second har...

Exponential monomials are the basic building bricks of spectral analysis and spectral synthesis on Abelian groups. Recently there have been some attempts to extend the most important spectral analysis and spectral synthesis results from groups to hypergroups. For this purpose it is necessary to introduce a reasonable concept of exponential monomials. In this work we reconsider this problem, and...

The syntheses, spectral and structural characterization of metallocenes incorporated normal and expanded calixphyrins are reported.

An important aspect of community analysis is not only determining the communities within the network, but also sub-communities and hierarchies. We present an approach for finding hierarchies in social networks that uses work from random matrix theory to estimate the number of clusters. The method analyzes the spectral fingerprint of the network to determine the level of hierarchy in the network...

Various approaches have been proposed in the literature for texture characterization of images. Some of them are based on statistical properties, others on fractal measures and some more on multi-resolution analysis. Basically, these approaches have been applied on mono-band images. However, most of them have been extended by including the additional information between spectral bands to deal w...

Earth-observing satellite sensors are calibrated in the laboratory against blackbody and lamp-based uniform optical radiation standards. These sources and additional characterization tests fail to approximate the spatially, spectrally, and temporally complex scenes viewed on-orbit by these sensors. The lack of appropriate diagnostic tools limits the ability of researchers to fully characterize ...

The paper shows that there is no finite set of forbidden minors which characterizes classes of independence models that are representable by Gaussian, discrete and binary distributions, respectively. In addition, a way to prove the nonexistence of a finite characterization for any other class of independence models is suggested. MSC 2000: 60A99, 68T30, 94A15

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