New Rochelle, NY, October 9, 2008 The latest version of NASAs Astrobiology Roadmap and exciting reports on new strategies for detecting biosignatures in Earth rocks highlight the diverse content of the August 2008 (Volume 8, Number 4) issue of Astrobiology, a peer-reviewed journal published by Mary Ann Liebert, Inc. Several key papers in the issue are available free online at www.liebertpub.com/ast

The latest version of NASAs Astrobiology Roadmap, a comprehensive document intended to guide and integrate research and technology development across groups from academia, government, and private institutions, is highlighted in this issue. The Roadmap defines research objectives aimed at answering three main questions: how does life begin and evolve; does life exist elsewhere in the universe; and what is the future of life on Earth and beyond?

Understanding how microbial biosignatures form in modern environments will contribute to a better understanding of how they can be applied to the study of extraterrestrial rocks, says journal Editor, Sherry L. Cady, PhD, Associate Professor of Geology, Portland State University.

In the paper Silicifying Biofilm Exopolymers on a Hot-Spring Microstromatolite: Templating Nanometer-Thick Laminae, Kim Handley, Sue Turner, Kathleen Campbell, and Bruce Mountain, from the University of Manchester (U.K.), the University of Auckland, and the Wairkei Research Centre (Taupo), New Zealand, present findings on the mineralization of exopolymeric substances (EPS), which are components of microbial biofilms.

The complexities encountered when using the iron isotope record to search for biosignatures in geological materials are illustrated in a report entitled, Stable Iron Isotopes and Microbial Mediation in Red Pigmentation of the Rosso Ammonitico (Mid-Late Jurassic, Verona Area, Italy). Authors Alain Prat, Jeroen de Jong, Bernard Mamet, and Nadine Mattielli, from the Universit libre de Bruxelles (Brussels, Belgium), describe the first detailed iron isotope study performed in Phanerozoic limestone.

Challenges faced when working with samples similar in size to material that will be cached for a future Mars Sample Return mission are described in the report entitled, Discovery of a New Chert-Permineralized Microbiota in the Proterozoic Buxa Formation of the Ranjit Window, Sikkim, Northeast India, and its Astrobiological Implications. Authors J. William Schopf, Vinod Tewari, and Anatoliy Kudryavtsev demonstrate how morphological remains of microorganisms can be found even in minute amounts of rock from an ancient paleobiological repository.

Astrobiology is an authoritative peer-reviewed journal published bimonthly in print and online increasing to 10 issues per year in 2009. The Journal provides a forum for scientists seeking to advance our understanding of lifes origins, evolution, distribution, and destiny in the universe. A complete table of contents and a full text for this issue may be viewed online at www.liebertpub.com/ast Astrobiology is the leading peer-reviewed journal in its field. To promote this developing field, the Journal has teamed up with The Astrobiology Web to highlight one outstanding paper per issue of Astrobiology. These papers are available free online at www.liebertpub.com/ast and to visitors of The Astrobiology Web at www.astrobiology.com

Mary Ann Liebert, Inc. (www.liebertpub.com) is a privately held, fully integrated media company known for establishing authoritative peer-reviewed journals in many promising areas of science and biomedical research. Its biotechnology trade magazine, Genetic Engineering & Biotechnology News (GEN), was the first in its field and is today the industrys most widely read publication worldwide. A complete list of the firms 60 journals, books, and newsmagazines is available at www.liebertpub.com

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• Tribute to John F. Lindsay
• Introduction
• The NASA Astrobiology Roadmap
• Discovery of a New Chert-Permineralized Microbiota in the Proterozoic Buxa Formation of the Ranjit Window, Sikkim, Northeast India, and Its Astrobiolo
• Silicifying Biofilm Exopolymers on a Hot-Spring Microstromatolite: Templating Nanometer-Thick Laminae
• Amino Acids from Ion-Irradiated Nitrile-Containing Ices
• Using Electrical Impedance Spectroscopy to Detect Water in Planetary Regoliths
• Experiment LEND of the NASA Lunar Reconnaissance Orbiter for High-Resolution Mapping of Neutron Emission of the Moon
• Hairy Blobs: Microbial Suspects Preserved in Modern and Ancient Extremely Acid Lake Evaporites
• Was There a Late Archean Biospheric Explosion?
• Stable Iron Isotopes and Microbial Mediation in Red Pigmentation of the Rosso Ammonitico (Mid-Late Jurassic, Verona Area, Italy)
• Fluorescence Microscopy as a Tool for In Situ Life Detection