The complexity of the visibility region formed by a point light source after k diffuse reflections in a simple n-sided polygon is O(n 9), which is the first result polynomial in n, with no dependence on k. This bound is an exponential improvement over the previous bound of O(n 2(k+1)/2+1) due to Prasad et al. .
To maintain tissue homeostasis, some organs are able to replace dying cells with additional proliferation of surviving cells. Such proliferation can be localized (e.g., a regeneration blastema) or diffuse (compensatory growth). The relationship between such growth and the growth that occurs during development has not been characterized in detail. Drosophila… (More)
Changes of intracellular and extracellular pH are involved in a variety of physiological and pathological processes, in which regulation of the Ca(2+) release activated Ca(2+) channel (I CRAC) by pH has been implicated. Ca(2+) entry mediated by I CRAC has been shown to be regulated by acidic or alkaline pH. Whereas several amino acid residues have been… (More)