New Methods and Sensors for Membrane and Cell Volume Research, Volume 88 provides an overview of novel experimental approaches to study both the cell membrane and the under-membrane space – the cytosol, which have lately began drawing renewed attention. The book's overall emphasis is on fluorescent and FRET-based sensors, however, other optical (such as variants of transmission microscopy) and non-optical methods (neutron scattering and mass spectrometry) also have dedicated chapters. This volume provides a rare review of experimental approaches to study intracellular phase transitions, as well as anion channels, membrane tension and dynamics, and other topics of intense current interest.