In this paper we present a technique for the Spin tool, inspired by practical experiences with Spin and a FireWire protocol. We show how to guide simulations with Spin, by constructing a special guide process that limits the behaviour of the original system. We set up a theoretical framework in which we prove under some sufficient conditions that the adjusted system (with the added guide proces...

INTRODUCTION Recent studies have reported the efficacy of sheathless percutaneous coronary intervention (PCI) using hydrophilic-coated 5-Fr guiding catheters that are one to two Fr sizes smaller in diameter than the corresponding introducer sheath (virtual 3-Fr PCI). However, the limited number of shapes of hydrophilic-coated guiding catheters occasionally makes them difficult to engage and con...

Neuronal migration is, along with axon guidance, one of the fundamental mechanisms underlying the wiring of the brain. As other organs, the nervous system has acquired the ability to grow both in size and complexity by using migration as a strategy to position cell types from different origins into specific coordinates, allowing for the generation of brain circuitries. Guidance of migrating neu...

Thin glass fibers imbedded into a glass cladding of slightly lower refractive index represent a promising medium for optical communication. This article presents simple formulas and functions for the fiber parameters as a help for practical design work. It considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section. Plots vs fr...

We show how optical flow estimates can be combined with boundary estimation to improve estimates of motion. The improvement is associated with blending of estimates from complementary bases of operation. The paper combines a phase-based method for optical flow with a time extended version of the phase congruency operator. By evaluation on synthetic and real image sequences, the combination of t...

In the endocytic pathway, early endosomes are converted into late endosomes by exchange of their associated Rab GTPases. In this issue, Poteryaev et al. (2010) identify the SAND-1/Mon1 protein as a switch that shuts off the recruitment of one Rab (Rab5) and facilitates the activation of the next (Rab7).