The current aspects related to the technology of flow cytometry are discussed in this book. It is a compilation of complete reviews and unique technical researches. The data demonstrates the continuously developing application of flow cytometry in a varied number of technical fields as well as its wide-scale utilization evident from the global composition of the group of contributing authors. The book deals with the employment of cytometry methodology in fundamental sciences and covers many diverse fields of aquatic and plant ecology. This book intends to present some useful information to students and experts dealing with flow cytometry.