The Journal of Fluorescence s fourth Who s Who directory is to publish the names, contact details, specialty keywords, and a brief description of scientists employing fluorescence methodology and instrumentation in their working lives. In addition, the directory will provide company contact details with a brief list of fluorescence-related products. The directory will be edited by Chris D. Geddes and Joseph R. Lakowicz, editor and founding editor of the Journal of Fluorescence.

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This is the third volume in the Reviews in Fluorescence series. To date, two volumes have been both published and well received by the scientific community. Several book reviews have also favorably described the series as an "excellent compilation of material which is well balanced from authors in both the US and Europe." Of particular mention we note the recent book review in JACS by Gary Baker, Los Alamos. In this 3rd volume we continue the tradition of publishing leading edge and timely articles from authors around the world. We hope you find this volume as useful as past volumes, which...

This is the fourth volume in the Reviews in Fluorescence series. To date, three volumes have been both published and well received by the scienti c community. Several book reviews in the last few years have also favorably remarked on the series. In this fourth volume we continue the tradition of publishing leading edge and timely articles from authors around the world. We thank the authors for their timely and exciting contributions. We hope you nd this volume as useful as past volumes, which promises to be just as diverse with regard to uorescence-based content. Finally, in closing, I would...