Diffusion and Transport in Cells

This lecture covers the concepts of diffusion and transport in cells, focusing on the relationship between the microscopic features of molecules and the diffusion constant. It explains how molecules move by thermal fluctuations and the role of drift velocity in directional transport. The lecture also delves into the challenges faced by cells in transporting materials, such as proteins and signaling molecules, to specific locations within the cell. Additionally, it discusses the mechanisms behind directional transport, including the use of transport motors and the importance of energy extraction for cellular processes.