CURRICULUM VITAE

Niels Kroer, PhD Director of Research Department National Environmental Research Institute Department of Environmental Chemistry and Microbiology Frederiksborgvej 399 DK-4000 Roskilde, Denmark Phone: +45 46 30 13 88 Fax: + 45 46 30 12 16 Email: nk@dmu.dk

 RESEARCH INTERESTS

Evolution of microbial communities, exchange of genetic material between bacteria, bacterial turnover of dissolved carbon and nitrogen in coastal and oceanic waters, regulation of bacterial growth efficiency, bacterial viruses, functional diversity of aquatic microbial communities.

CURRENT RESEARCH PROJECTS

• Effect of viral infection on the diversity and adaptation of marine bacterial communities
• Molecular and microcosm analyses of the potential for gene transfer in radionuclei and metal-contaminated subsurface environments
• Exchange of antibiotic resistance genes between microorganisms: Consequences for food safety

SELECTED RECENT PUBLICATIONS

Frette, L., N.O.G. Jørgensen, H. Irming, N. Kroer. 2002. Characterisation of Tenacibaculum cellulolyticum sp. Nov, a cellulose degrading bacterium isolated from the pelagic zone in Skagarrak, Denmark. Submitted to IJSEM.

Frette, L., K. Johnsen, N.O.G. Jørgensen, O. Nybroe and N. Kroer. 2002. Diversity and Functional Characteristics of Culturable Bacterioplankton from Marine and Estuarine Environments. Submitted to Microbial Ecology.

Schwaner, N. E. and N. Kroer. 2001. Effect of plant species on rates of conjugal gene transfer in the rhizosphere and relation to bacterial metabolic activity. Microb. Ecol. 42: 458-465.

Sengeløv, G., K.J. Kristensen, A.H.S Sørensen, N. Kroer and S.J. Sørensen. 2001. Effect of Genomic Location on Horizontal Transfer of a Recombinant Gene Cassette between Pseudomonas strains in the Rhizosphere and Spermosphere of Barley Seedlings. Curr. Microbiol. 42: 160-167.

Sengeløv, G, S. J. Sørensen, L. Frette and N. Kroer. 2000. A New Method for Determining the Metabolic Activity of Specific Bacterial Populations in Soil by Use of Incorporation of Tritiated Leucine and Immunomagnetic Separation. Biol. Fertil. Soils 32: 202-208.

Jørgensen, N.O.G., N. Kroer, R.B. Coffin and M.P. Hoch. 1999. Relations between nitrogen metabolism and growth efficiency in an estuarine and an open-water ecosystem. Aquatic Microb. Ecol. 18: 247-261. Normander, B., B. J. Christensen, S. Molin and N. Kroer. 1998. The Effect of Bacterial Distribution and Activity on Conjugal Gene Transfer on the Phylloplane of Bush Bean (Phaseolus vulgaris). Appl. Environ. Microbiol. 64: 1902-1909.

Kroer, N., S. J. Sørensen, T. Barkay and D. Weber. 1998. Effects of root exudates and bacterial activity on conjugal gene transfer in the rhizosphere of a marsh plant. FEMS Microbiol. Ecol. 25: 375-384.

Middelboe, M., N. Kroer, N.O.G. Jørgensen and D. Paculski. 1998. Influence of sediment on the pelagic carbon and nitrogen turnover in a shallow Danish estuary. Aquatic. Microbiol. Ecol. 14: 81-90.

Middelboe, M., N. O. G. Jørgensen and N. Kroer. 1996. Effects of viruses on nutrient turnover and growth efficiency of noninfected marine bacterioplankton. Appl. Environ. Microbiol. 62: 1991-1997.

Sørensen, S.J., N. Kroer, E. Sørensen, G. Sengeløv and T. Barkay 1996. Conjugation in aquatic environments. In: Molecular Microbial Ecology Manual (Eds. Akkermans, A.D.L., J.D. van Elsas and F.J. de Bruijn). Kluwer Academic Publishers. Molecular Microbial Ecology Manual 5.2.1: 1-29.

Barkay, T., N. Kroer, L.D. Rasmussen, and S.J. Sørensen. 1995. Conjugal transfer at natural population densities in a microcosm simulating an estuarine environment. FEMS Microbiol. Ecol. 16: 43-54.

Kroer, N., N.O.G. Jørgensen, and R.B. Coffin. 1994. Utilization of dissolved nitrogen by heterotrophic bacterioplankton: A comparison of three ecosystems. Appl. Environ. Microbiol. 60: 4116-4123.

Jørgensen, N.O.G., N. Kroer, and R.B. Coffin. 1994. Utilization of dissolved nitrogen by heterotrophic bacterioplankton: Effect of substrate C:N ratio. Appl. Environ. Microbiol. 60: 4124-4133.

Kroer, N., R.B. Coffin & N.O.G. Jørgensen. 1994. Microbial trophodynamics in aquatic microcosms designed for assessing fate and effects of introduced microorganisms. Environ. Toxicol. Chem. 13: 247-257.

Kroer, N. 1994. Relationships between biovolume and carbon and nitrogen content of bacterioplankton. FEMS Microbiol. Ecol. 13: 217-224.

Kroer, N. 1993. Bacterial growth efficiency on natural dissolved organic matter. Limnol. & Oceanogr. 38: 1282-1290.

Jørgensen, N.O.G., N. Kroer, R.B. Coffin, X-H. Yang, and C. Lee. 1993. Dissolved free amino acids, combined amino acids, and DNA as sources of carbon and nitrogen to marine bacteria. Mar. Ecol. Prog. Ser. 98: 135-148.

Kroer, N. & R.B. Coffin. 1992. Microbial trophic interactions in aquatic microcosms designed for testing of genetically engineered microorganisms: A field comparison. Microb. Ecol. 23: 143-157.