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By R. Allen Dyer

This article is a pictorial presentation and incorporates a key to genera and species.

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Rillmann, B. D. (1997) Applied and Environmental Microbiology, 63, 2397–2402. Steenhoudt, O. and Vanderleyden, J. (2000) FEMS Microbiology Reviews, 24, 487–506. , Holguin, G. E. (2004) Canadian Journal of Microbiology, 50, 521–577. K. (2003) Plant and Soil, 255, 571–586. j15 16 j 1 Ecology, Genetic Diversity and Screening Strategies 64 Reinhold-Hurek, B. and Hurek, T. (2000) International Journal of Systematic Evolutionary Microbiology, 50, 649–659. 65 Hurek, T. and Reinhold-Hurek, B. (2003) Journal of Biotechnology, 106, 169–178.

Thus, A. brasilense GS appears to be most structured among all bacterial GSs known to date, with about 70% of its polypeptide chain being structured (a-helices þ b-structural elements) in both unadenylylated and partly adenylylated enzyme. Upon removal of cations from the active centers, the proportions of the secondary structure elements change, but the protein remains similarly highly structured. 1 Methodological Outlines and Prerequisites The aforementioned reversible loss of the GS activity upon removal of native cations, with its restoration upon subsequent addition of a new cation, makes it possible, in principle, to replace the native cations by EMS-active 57 Co2þ under physiologically similar conditions [36].

3–20. Campbell, R. P. (1990) Anatomy and community structure of the rhizosphere in The Rizosphere (ed. M. Lynch), John Wiley & Sons, Ltd, Essex, pp. 11–34. R. A. (1989) Soil Biology & Biochemistry, 21, 789. , Bååth, E. and Tunlid, A. (1993) Soil Biology & Biochemistry, 25 (6), 723–730. D. D. (2001) Soil Biology & Biochemistry, 33, 533–551. Tunlid, A. C. (1990) Use of lipid biomarkers in environmental samples, in Analytical Microbiology Methods (eds A. ), Plenum Press, New York, pp. 259–274. Tunlid, A.

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