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Some flow cytometers have the ability to physically separate different sub-populations of interest (cell sorting) depending on their cytometric characteristics (stream-in-air), thus permitting the recovery and purification of cell subsets from a mixed population for further applications (Bergquist et al., 2009; Davey, 2010). In natural samples in particular, a very important advantage of FCM is the opportunity to analyze micro-organisms with minimal pre-treatment and without the need for cultivation steps, also taking into account that the most of natural bacteria are resistant to cultivation (Fig. 2). Furthermore, FCM is particularly well-suited for the investigation of natural picoplankton. This is because of their small size (. | METABOLOMICS Edited by Ute Roessner Metabolomics Edited by Ute Roessner Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Igor Babic Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published February 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Metabolomics Edited by Ute Roessner p. cm. 978-953-51-0046-1 INTECH open science I open minds free online editions of InTech Books and Journals can be found at .