Leading researchers are specially invited to provide a complete understanding of a key topic within the multidisciplinary fields of physiology, biochemistry and pharmacology. In a form immediately useful to scientists, this periodical aims to filter, highlight and review the latest developments in these rapidly advancing fields. Chapter "Stationary and Non-Stationary Ion- and Water Flux Interactions in Kidney Proximal Tubule. Mathematical Analysis of Isosmotic Transport by a Minimalistic Model" is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.