We report herein experimental observations of the reciprocating motion of a self-propelled droplet floating on the surface of an aqueous surfactant solution and a simple reaction model capable of reproducing the observed behavior of the droplet.
Mammalian skin works as physical, chemical, and immunological defenses, keeping water inside and nuisances outside. Such barrier function is maintained in stratum corneum, the outermost layer composed of dead cells. We construct a mathematical model of the epidermal structure depending on dermal deformation in order to mathematically understand the mechanisms of homeostasis of the barrier function of the stratum corneum. Our mathematical model consists of Ca2+ dynamics, cells dynamics and basal membrane dynamics. Using these mathematical models, we aim at understanding of the homeostatic mechanism of the barrier function of the stratum corneum.