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1.              Katkevica, S., Held, A., and M.A. Horn. 2016. Quantification of environmentally important [12C]- and [13C]-low molecular weight organic acids in peat extracts by reversed-phase high performance liquid chromatography coupled with mass spectrometry using post column phase pH increase. Journal of Chromatography A: In revision.

2.              Borken, W., Horn, M.A., Bahamonde, N., and K.-H. Knorr. 2016. Symbiotic nitrogen fixation by the Podocarpaceae Lepidothamnus fonckii and Beijerinckiaceae. New Phytologist: In revision.

3.              Palmer, K., Köpp, J., Gebauer, G., and M.A. Horn. 2016. Drying-rewetting and flooding impact denitrifier activity rather than community structure in a moderately acidic fen. Frontiers in Microbiology: In press.

4.              Schmidt, O., Hink, L., Horn, M.A., and H.L. Drake. 2016. Peat: Home to novel syntrophic species that feed acetate- and hydrogen-scavenging methanogens. ISME Journal: doi: 10.1038/ismej.2015.256.

5.              Borken, W., Horn, M.A., and K.-H. Knorr. 2015. Significant non-symbiotic nitrogen fixation in Patagonian ombrotrophic bogs. Global Change Biology: 21: 2357-2365.

6.              Palmer, K., and Horn, M.A. 2015. Denitrification activity of a remarkably diverse fen denitrifier community in Finnish Lapland is nitrate limited. PLOSone 10: e0123123.

7.              Schmidt, O., Horn, M.A., Kolb, S., and H.L. Drake. 2015. Temperature impacts differentially on prokaryotes involved in the intermediary ecosystem metabolism in cellulose-supplemented methane-emitting peatland soil. Environmental Microbiology 17: 720-734.

8.              Härtig, C., Lohmayer, R., Kolb, S., Horn, M.A., Inskeep, W.P., and B. Planer-Friedrich. 2014. Chemolithotrophic growth of the aerobic hyperthermophilic bacterium Thermocrinis ruber OC 14/7/2 on monothioarsenate and arsenite. FEMS Microbiology Ecology 90: 747-760.

9.              Dallinger, A., and M.A. Horn. 2014. Agricultural soil and drilosphere as reservoirs of new and unusual assimilators of 2,4-dichlorophenol carbon. Environmental Microbiology 16: 84-100 (Special Issue: Metabolism & Biodegradation).

10.          Liu, Y.-J., Liu, S.-J., Drake, H.L., and M.A. Horn. 2013. Consumers of 4-chloro-2-methylphenoxyacetic acid from agricultural soil and drilosphere harbour cadA, r/spdA, and tfdA-like gene encoded oxygenases. FEMS Microbiology Ecology 86: 114-129 (Special Issue: Microbial ecology of biogeochemical interfaces – diversity, structure and function of microhabitats in soil).

11.          Ditterich, F., Poll, C., Pagel, H., Babin, D., Smalla, K., Horn, M.A., Streck, T., and E. Kandeler. 2013. Succession of bacterial and fungal MCPA degraders at the soil-litter interface. FEMS Microbiology Ecology 86: 85-100.

12.          Depkat-Jakob, P.S., Brown, G.G., Tsai, S.M., Horn, M.A., and H.L. Drake. 2013. Emission of denitrification-derived nitrous oxide and dinitrogen by diverse earthworm families from Brazil. FEMS Microbiology Ecology 83: 375-391.

13.          Palmer, K., and M.A. Horn. 2012. Actinobacterial nitrate reducers and Proteobacterial denitrifiers are abundant in N2O metabolizing palsa peat. Applied and Environmental Microbiology 78: 5584-5596.

14.          Palmer, K., Biasi, C., and M.A. Horn. 2012. Contrasting denitrifier communities relate to contrasting N2O emission patterns from acidic peat soils in arctic tundra. ISME Journal 6: 1058-1077.

15.          Schmidt, O., Wüst, P.K., Hellmuth, S., Borst, K., Horn, M.A., and H.L. Drake. 2011. Novel [NiFe]- and [FeFe]-hydrogenase gene transcripts indicative of active facultative aerobes and obligate anaerobes in earthworm gut contents. Applied and Envrionmental Microbiology 77: 5842-5850.

16.          Hämmerle, M., Hilgarth, K., Horn, M.A., and R. Moos.  2011.  Determination of volatile alcohols in apple juices by an electrochemical biosensor measuring in the headspace above the liquid. Sensors and Actuators B 158: 313-318.

17.          Hunger, S., Schmidt, O., Hilgarth, M., Horn, M.A., Kolb, S., Conrad, R., and H.L. Drake. 2011. Competing formate- and carbon dioxide-utilizing prokaryotes in an anoxic methane-emitting fen soil. Applied and Environmental Microbiology 77: 3773-3785.

18.          Kador, M., Horn, M.A., and K. Dettner.  2011.  Novel oligonucleotide probes for in situ detection of pederin-producing endosymbionts of Paederus riparius rove beetles (Coleoptera: Staphylinidae). FEMS Letters 319: 73-81.

19.          Wüst, P.K., M.A. Horn, and H.L. Drake.  2011. Clostridiaceae and Enterobacteriaceae as active fermenters in earthworm gut content. ISME Journal 5: 92-106.

20.          Liu, Y.J., A. Zaprasis, S.-J. Liu, H.L. Drake, and M.A. Horn. 2011. The earthworm Aporrectodea caliginosa stimulates abundance and activity of phenoxyalkanoic acid herbicide degraders. ISME Journal 5: 473-485.

21.          Liu, Y.J., S.-J. Liu, H.L. Drake, and M.A. Horn. 2011. Alphaproteobacteria dominate active 2-methyl-4-chlorophenoxyacetic acid herbicide degraders in agricultural soil and drilosphere. Environmental Microbiology 13: 991-1009.

22.          Zaprasis, A., Y.J. Liu, S.-J. Liu, H.L. Drake, and M.A. Horn. 2010. Novel and diverse tfdA-like genes encoding putative phenoxyalkanoic acid herbicide degrading dioxygenases are abundant in soil. Applied and Environmental Microbiology 76: 119-128.

23.          Schmidt, O., H.L. Drake, and M.A. Horn. 2010. Hitherto unknown [Fe-Fe]-hydrogenase gene diversity in anaerobes and anoxic enrichments from a moderately acidic fen. Applied and Environmental Microbiology 76: 2027-2031.

24.          Palmer, K., H.L. Drake, and M.A. Horn2010.  Association of novel and highly diverse acid-tolerant denitrifiers with N2O fluxes of an acidic fen. Applied and Environmental Microbiology 76: 1125-1134.

25.          Kotzerke, A., S. Klemer, K. Kleineidam, M.A. Horn, H.L. Drake, M. Schloter, and B.-M. Wilke. 2010. Manure contaminated with the antibiotic sulfadiazine impairs the abundance of nirK- and nirS-type denitrifiers in the gut of the earthworm Eisenia fetida. Biology and Fertility of Soils 46: 415-418.

26.          Depkat-Jakob, P.S., M. Hilgarth, M.A. Horn, and H. L. Drake. 2010. Effect of earthworm feeding guild on ingested dissimilatory nitrate reducers and denitrifiers in the alimentary canal of earthworms. Applied and Environmental Microbiology 76: 6205-6214.

27.          Wüst, P.K., M.A. Horn, G. Henderson, P.H. Janssen, B. Rehm, and H.L. Drake.  2009.  Gut-associated denitrification and in vivo emission of nitrous oxide by the earthworm families Megascolecidae and Lumbricidae in New Zealand. Applied and Environmental Microbiology 75: 3430-3436.

28.          Wüst, P.K., M.A. Horn, and H.L. Drake.  2009.  In situ hydrogen (H2) and nitrous oxide (N2O) as indicators of concomitant fermentation and denitrification in the alimentary canal of the earthworm Lumbricus terrestris. Applied and Environmental Microbiology 75: 1852-1859.

29.          Wüst, P.K., M.A. Horn, and H.L. Drake.  2009.  Trophic links between fermenters and methanogens in a moderately acidic fen soil. Environmental Microbiology 11: 1395-1409.

30.          Palmer, K., H.L. Drake, and M.A. Horn.  2009.  Genome derived criteria for assigning environmental narG and nosZ sequences to operational taxonomic units of nitrate reducers. Applied and Environmental Microbiology 75: 5170-5174.

31.          Hamberger, A., M.A. Horn, M.G. Dumont, J.C. Murrell, and H.L. Drake.  2008.  Anaerobic consumers of monosaccharides in a moderately acidic fen.  Applied and Environmental Microbiology 74: 3112-3120.

32.          Horn, M.A., R. Mertel, M. Kästner, M. Gehre, and H.L. Drake.  2006.  In vivo emission of dinitrogen (N2) by earthworms via denitrifying bacteria in the gut. Applied and Environmental Microbiology 72: 1013-1018.

33.          Horn, M.A., H.L. Drake, and A. Schramm.  2006.  Nitrous oxide reductase genes (nosZ) of denitrifying populations in soil and the earthworm gut are phylogenetically similar. Applied and Environmental Microbiology 72: 1019-1026.

34.          Ihssen, J., M.A. Horn, C. Matthies, A. Gößner, A. Schramm, and H.L. Drake. 2003. N2O-producing microorganisms in the gut of the earthworm Aporrectodea caliginosa are indicative of ingested soil bacteria. Applied and Environmental Microbiology 69: 1655-1661.

35.          Horn, M.A., J. Ihssen, C. Matthies, A. Schramm, G. Acker, and H.L. Drake.  2005. Dechloromonas denitrificans sp. nov., Flavobacterium denitrificans sp. nov., Paenibacillus anaericanus, and Paenibacillus terrae Strain MH72, N2O-producing bacteria isolated from the gut of the earthworm Aporrectodea caliginosa.  International Journal of Systematic and Evolutionary Microbiology 55: 1255-1265.

36.          Horn, M.A., A. Schramm, and H.L. Drake. 2003. The earthworm gut: an ideal habitat for ingested N2O-producing microorganisms. Applied and Environmental Microbiology 69: 1662-1669.

37.          Horn, M.A., C. Matthies, K. Küsel, A. Schramm, and H.L. Drake. 2003.  Hydrogenotrophic methanogenesis by moderately acid-tolerant methanogens of a methane-emitting acidic peat. Applied and Environmental Microbiology 69: 74-83.


Buchkapitel und Übersichtsartikel

38.          Kolb, S., and M.A. Horn. 2012. Microbial CH4 and N2O consumption in acidic wetlands. Frontiers in Terrestrial Microbiology 3: 78 (doi: 10.3389/fmicb.2012.00078).

39.          Horn, M.A., P.K Wüst, and H.L. Drake. 2009. Der Regenwurmdarm – ein mobiles Schlaraffenland für Bodenanaerobier. Biospektrum 04/09, S. 377-379.

40.          Drake, H.L., M.A. Horn, and P.K. Wüst. 2009. Intermediary ecosystem metabolism as a main driver of methanogenesis in acidic wetland soil. Environmental Microbiology Reports 1: 307-318.

41.          Drake, H.L., and M.A. Horn.  2007.  As the worm turns:  the earthworm gut as a transient habitat for soil microbial biomes. Annual Reviews in Microbiology 61: 169–189.

42.          Drake, H.L., and M.A. Horn.  2006.  Earthworms as a transient heaven for terrestrial denitrifying microbes: a review.  Engeneering in Life Sciences. 6: 261-265.

43.          Drake, H.L., A. Schramm, and M.A. Horn.  2006.  Earthworm gut microbial biomes: Their importance to soil microorganisms, denitrification, and the terrestrial production of the greenhouse gas N2O, p. 65-87.  In:  König, H, Varma, A. (eds.), Intestinal microorganisms of termites and other invertebrates.  Springer-Verlag, New York, New York.