A process and apparatus is disclosed for characterizing an ensemble of microparticles and monitoring their response to environmental factors such as chemically and biologically active agents. The apparatus permits the very accurate measurement of light or radiation intensity scattered by the microparticles...http://www.google.de/patents/US4541719?utm_source=gb-gplus-sharePatent US4541719 - Method and apparatus for characterizing microparticles and measuring their response to their environment
