ABSTRACT
To begin, let us get a clear definition of what we will be discussing in this chapterdo you have a ‘‘clean room,’’ or do you have a ‘‘cleanroom?’’ Of course as we know from growing up, when it is separated into two different words-clean and room-that is what your mother always wanted to have. As one word, it lays the foundation of our current desire for a controlled environment in which we are trying to minimize detriment caused by particulate, either viable or nonviable.
