Personal profile

My main interest is the investigation of mutualistic and parasitic protists from insects. Using light, transmission and scanning electron microscopy, I analyze the biodiversity, biology (e.g. life cycle stages) and structure of protists. In collaborative projects, molecular methods support the analysis of e.g. phylogeny and host specificity of the protists. One major field of interest are the symbiotic gut flagellates of lower termites (e.g., description and phylogeny of new flagellate species and genera, or of the associations of the flagellates and their bacterial symbionts). A second field of interest are spore-forming protists from cockroaches and beetles. Present work focuses on infections with the unicellular fungal taxon Nephridiophagales (phylogeny, impact on the host, life cycle details). Further investigated pathogen taxa are microsporidia and coccidia.

Current collaborations

Termite flagellates: Prof. Dr. Andreas Brune, Max-Planck-Institute for Terrestrial Microbiology, Marburg. Insect pathogens: Prof. Dr. Mustafa Yaman, Bolu Abant Izzet Baysal University, Turkey. Prof. Dr. Andreas Linde, University of Applied Sciences Eberswalde, Germany. Dr. Jürgen Strassert, Freie Universität Berlin, Germany.

Third-party funds

DFG-Project „The multiple symbioses of flagellates and their bacterial endo- and ectobionts in dry wood termites: an analysis of ultrastructure, phylogeny and cospeciation“ together with Prof. Dr. A. Brune, MPI Marburg (2007 – 2011).
DFG-Project „Host-parasite interaction in the endobiotic basal fungal lineage Nephridiophagidae and its insect hosts“ (2017 – 2022).

Editorial board member

Acta Protozoologicasince2005, European Journal of Protistology since 2005, Journal of Eukaryotic Microbiology since 2012, Turkish Journal of Zoology since 2022

Involvement in the organisation of meetings

IX International Congress of Protozoology, 1993 in Berlin
25. Scientific Meeting of the German Society for Protozoology, 2006 in Liebenwalde (close to Berlin)
VI European Congress of Protistology, 2011 in Berlin as Secretary General

Member in learned societies

Berlin Microscopical Society (BMG)
German Society for Protozoology (DGP)
International Society of Protistologists (ISOP)

Publications

1. Bell, R., Scholtyseck, E., Elwasila, M. (1986): Blood parasites of the common African toad Bufo regularis in the Sudan. Sudan Journal of Science 2, 71-82.
2. Bell, R., Achenbach, F. (1987): Reactivation of cytoplasmic acto­myosin in Physarum plasmodia extracted with glycerol and dimethylsulfoxide. Journal of Cell Science 87, 231-239. https://doi.org/10.1242/jcs.87.2.231
3. Bell, R., Scholtyseck, E. (1987): Developmental stages of Haemo­gregarina faiyumensis in the toad Bufo regularis in the Sudan. Archiv für Protisten­kunde 133, 277-283.
4. Bell, R. (1987): Untersuchungen zum Regulationsmechanismus der Kontraktion von cytoplasmatischem Aktomyosin in Zellmodellen von Physarum polycephalum. Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn, S. 1-225.
5. Bell, R. (1988): Reactivation of cell-free models of Physarum plasmodia after myosin reconstitution. European Journal of Cell Biology 47, 7-13.
6. Radek, R., Hausmann, K. (1991): Mikroorganismen in extremen Lebensräumen. Symbiontische Flagellaten in der Gärkammer von Termiten. Biologie in unserer Zeit 21, 160-162.
7. Radek, R., Hügelmeyer, P., Stockem, W. (1992): Studies on microplasmodia of Physarum polycephalum. VIII. Visualization of a membrane skeleton and characterization of membrane proteins. European Journal of Protistology 28, 305-315. https://doi.org/10.1016/s0932-4739(11)80237-3
8. Radek, R., Hausmann, K., Breunig, A. (1992): Ectobiotic and endobiotic bacteria associated with the termite flagellate Joenia annectens. Acta Protozoologica 31, 93-107.
9. Radek, R. (1993): Methan-produzierende Einzeller in Müllkippen. Mikrokosmos 82, 207-208.
10. Radek, R., Hausmann, K. (1994): Placojoenia sinaica n. g. n. sp., a symbiotic flagellate from the termite Kalotermes sinaicus. European Journal of Protistology 30, 25-37. https://doi.org/10.1016/S0932-4739(11)80195-1
11. Radek, R. (1994): Oxymonadida: Eine kleine Ordnung darmbewohnender Flagellaten. Mikrokosmos 83, 97-101.
12. Radek, R. (1994): Monocercomonoides termitis n. sp., an oxymonad from the lower termite Kalotermes sinaicus. Archiv für Protistenkunde 144, 373-382. https://doi.org/10.1016/S0003-9365%2811%2980240-X
13. Radek, R., Hausmann, K. (1994): Endocytosis, digestion, and defecation in flagellates (review). Acta Protozoologica 33, 127-147.
14. Radek, R. (1994): Symbiontische Beziehungen zwischen Termiten und Flagellaten. Mitteilungen der Deutschen Gesellschaft für angewandte und allgemeine Entomologie 9, 369-377.
15. Hausmann, K., Radek, R., Gradias, M. (1995): Joenia paradoxa n. sp. (Heteroflagellata, nov. subphyl.), a protozoan metakaryote with extraordinary axonemal and kinetosomal features. Naturwissenschaften 82, 188-189.
16. Radek, R. (1996): Lectine. Ihre Bedeutung in Natur und Wissenschaft. Mikrokosmos 85, 93-99.
17. Rösel, J., Radek, R., Hausmann, K. (1996): Ultrastructure of the trichomonad flagellate Stephanonympha nelumbium. Eukaryotic Journal of Microbiology 43, 505-511. https://doi.org/10.1111/j.1550-7408.1996.tb04511.x
18. Radek, R., Rösel, J., Hausmann, K. (1996): Light and electron microscopic study of the bacterial adhesion to termite flagellates applying lectin cytochemistry. Protoplasma 193, 105-122.
19. Radek, R. (1996/97): Monocercomonoides hausmanni nom. nov., a new species name for M. termitis Radek, 1994. Archiv für Protistenkunde 147, 411.
20. Radek, R. (1997): Spirotrichonympha minor n. sp., a new hypermastigote termite flagellate. European Journal of Protistology 33, 360-374. https://doi.org/10.1016/S0932-4739(97)80048-X
21. Radek, R. (1998): Symbiosen von Tieren mit Mikroorganismen. I. Teil: Endocytosymbiosen. Mikrokosmos 87, 157-162.
22. Radek, R. (1998): Symbiosen von Tieren mit Mikroorganismen. II. Teil: Symbiosen in pflanzenfressenden Insekten und Wirbeltieren. Mikroskosmos 87, 205-210.
23. Rother, A., Radek, R., Hausmann, K. (1999): Characterization of surface structures covering termite flagellates of the family Oxymonadidae with special consideration of Microrhopalodina multinucleata and Oxymonas sp. European Journal of Protistology 35, 1-16. https://doi.org/10.1016/S0932-4739(99)80018-2
24. Radek, R., Herth, W. (1999): Ultrastructural investigation of the spore-forming protist, Nephridiophaga blattellae, in the Malpighian tubules of the German cockroach, Blattella germanica. Parasitology Research 85, 216-231. https://doi.org/10.1007/s004360050538
25. Radek, R., Tischendorf, G. (1999): Bacterial adhesion to termite flagellates: Characterization of the attachment sites by treatment with chemicals and by freeze-etching. Protoplasma 207, 43-53.
26. Radek, R. (1999): Wirtstier-spezifische Artengemeinschaften von symbiontischen Flagellaten in Niederen Termiten. Courier Forschungsinstitut Senckenberg 215, 157-161.
27. Radek, R. (1999): Flagellates, bacteria, and fungi associated with termites: Diversity and function in nutrition - a review. Ecotropica 5, 183-196.
28. Radek, R., Fabel, P. (2000): A new entomopoxvirus from a cockroach: Light and electron microscopy. Journal of Invertebrate Pathology 75, 19-27. https://doi.org/10.1006/jipa.1999.4896
29. Radek, R. (2000): Light and electron microscopic study of a Rickettsiella species from the cockroach Blatta orientalis. Journal of Invertebrate Pathology 76, 249-256. https://doi.org/10.1006/jipa.2000.4984
30. Fabel, P., Radek, R., Storch, V. (2000): A new spore-forming protist, Nephridiophaga blaberi sp. nov., in the death´s head cockroach Blaberus craniifer. European Journal of Protistology 36, 387-395. https://doi.org/10.1016/S0932-4739(00)80044-9
31. Radek, R., Hausmann, K. (2001): Lorenz Oken: Naturwissenschaftler und Naturphilosoph. Mikrokosmos 90, 257-260.
32. Simpson, A. G. B., Radek, R., Dacks, J. B., O´Kelly, C. J. (2002): How oxymonads lost their groove: An ultrastructural comparison of Monocercomonoides and excavate taxa. The Journal of Eukaryotic Microbiology 49, 239-248. https://doi.org/10.1111/j.1550-7408.2002.tb00529.x
33. Radek, R., Klein, G., Storch, V. (2002): The spore of the unicellular organism Nephridiophaga blattellae: Ultrastructure and substances of the spore wall. Acta Protozoologica 41, 169-181.
34. Wenzel, M., Radek, R., Brugerolle, G., König, H. (2003): Identification of the ectosymbiotic bacteria of Mixotricha paradoxa involved in movement symbiosis. European Journal of Protistology 39, 11-23. https://doi.org/10.1078/0932-4739-00893
35. Yaman, M., Radek, R. (2003): Nosema chaetocnemae sp. n. (Microspora: Nosematidae), a microsporidian parasite of Chaetocnema tibialis (Coleoptera: Chrysomelidae). Acta Protozoologica 42, 231-237.
36. Hausmann, K., Radek, R. (2003): Die sonderbaren Extrusomen der Microthoraciden (Ciliaten). Mikrokosmos 92, 211-217.
37. Stingl, U., Maass, A., Radek, R., Brune, A. (2004): Symbionts of the gut flagellate Staurojoenina sp. from Neotermes cubanus represent a novel, termite-associated lineage of Bacteroidales: Description of 'Candidatus Vestibaculum illigatum. Microbiology 150, 2229-2235. http://dx.doi.org/10.1099/mic.0.27135-0
38. Wylezich, C., Radek, R., Schlegel, M. (2004): Phylogenetische Analyse der 18S rRNA identifiziert den parasitischen Protisten Nephridiophaga blattellae (Nephridiophagidae) als Vertreter der Zygomycota (Fungi). Denisia 13, 435-442.
39. Yaman, M., Radek, R. (2005): A new microsporidian parasite record of Phyllotreta undulata (Chrysomelidae, Coleoptera). Turkish Journal of Zoology 29, 67-69.
40. Stingl, U., Radek, R., Yang, H., Brune, A. (2005): “Endomicrobia”: Cytoplasmic symbionts of termite gut protozoa form a separate phylum of prokaryotes. Applied and Environmental Microbiology 71, 1473-1479. https://doi.org/10.1128/aem.71.3.1473-1479.2005
41. Yaman, M., Radek, R., Aslan, İ., Ertürk, Ö. (2005): Characteristic features of Nosema phyllotretae Weiser 1961, a microsporidian parasite of Phyllotreta atra (Coleoptera: Chrysomelidae) in Turkey. Zoological Studies 44, 368-372.
42. Yaman, M., Radek, R. (2005): Helicosporidium infection of the great spruce bark beetle, Dendroctonus micans (Coleoptera: Scolytidae). European Journal of Protistology 41, 203-207. https://doi.org/10.1016/j.ejop.2005.04.002
43. Yaman, M., Aslan, İ., Radek, R. (2005): Phyllotreta nigripens (Coleoptera: Chrysomelidae), a new host of Nosema phyllotretae Weiser 1961 in Turkey. Journal of Pest Science 78, 239-242. http://dx.doi.org/10.1007/s10340-005-0100-y
44. Dröge, S., Fröhlich, J., Radek, R., König, H. (2006): Spirochaeta coccoides, a novel coccoid spirochete from the hindgut of the termite Neotermes castaneus. Applied and Environmental Microbiology 72, 392-397. https://doi.org/10.1128/AEM.72.1.392-397.2006
45. Maaß, A., Radek, R. (2006): The gut flagellate community of the termite Neotermes cubanus with special reference to Staurojoenina and Trichocovina hrdyi nov. gen. nov. spec. European Journal of Protistology 42, 125–141. https://doi.org/10.1016/j.ejop.2006.03.001
46. Corsaro, D., Thomas, V., Goy, G., Venditti, D., Radek, R., Greub, G. (2007): ‘Candidatus Rhabdochlamydia crassificans’, an intracellular bacterial pathogen of the cockroach Blatta orientalis (Insecta: Blattodea). Systematic and Applied Microbiology 30, 221–228. https://doi.org/10.1016/j.syapm.2006.06.001
47. König, H., Fröhlich, J., Li, L., Wenzel, M., Dröge, S., Breunig, A., Pfeiffer, P., Radek, R., Brugerolle, G. (2007): The flagellates of the Australian termite Mastotermes darwiniensis: Identifi­cation of their symbiotic bacteria and cellulases. Symbiosis 44, 51–65.
48. Radek, R., Nitsch, G. (2007): Ectobiotic spirochetes of flagellates from the termite Mastotermes darwiniensis: Attachment and cyst-formation. European Journal of Protistology 43, 281-294. https://doi.org/10.1016/j.ejop.2007.06.004
49. Yaman, M., Radek, R. (2007): Infection of the predator beetle Rhizophagus grandis Gyll. (Coleoptera, Rhizophagidae) with the insect pathogenic alga Helicosporidium sp. (Chlorophyta: Trebouxiophyceae). Biological Control 41, 384-388. https://doi.org/10.1016/j.biocontrol.2007.03.001
50. Radek, R. (2008): Mikroskosmos: Leser, Autoren und Themenbereiche. Mikrokosmos 97, Sonderheft, 11-13.
51. Yaman, M., Radek, R. (2008): Pathogens and parasites of the great European spruce bark beetle, Dendroctonus micans (Kugelann) (Coleoptera: Scolytidae). Journal of Pest Science 81, 91-97.
52. Dröge, S., Rachel, R., Radek, R., König, H. (2008): Treponema isoptericolens sp. nov., a novel spirochete from the hindgut of the termite Incisitermes tabogae. International Journal of Systematic and Evolutionary Microbiology 58, 1079-1083. https://doi.org/10.1099/ijs.0.64699-0
53. König, H., Fröhlich, J., Li, L., Wenzel, M., Dröge, S., Breunig, A., Pfeiffer, P., Radek, R., Brugerolle, G. (2008): Identification of the endo- and ectosymbiotic bacteria and cellulolytic activities of the symbiotic flagellates of the Australian termite Mastotermes darwiniensis. Mitteilungen der Deutschen Gesellschaft für Allgemeine und Angewandte Entomologie 16, 211-218.
54. Yaman, M., Radek, R. (2008): Identification, distribution and occurrence of the ascomycete Metschnikowia typographi from the great spruce bark beetle, Dendroctonus micans. Folia Microbiologica 53, 427-432.
55. Yaman, M., Radek, R., Toguebaye, B. S. (2008): A new microsporidian of the genus Nosema, parasite of Chaetocnema tibialis (Coleoptera: Chrysomelidae) from Turkey. Acta Protozoologica 47, 279-285.
56. Hausmann, K., Radek, R. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil1: Symphorismus, Kommensalismus und Parasitismus. Mikrokosmos 98, 176-180.
57. Radek, R., Hausmann, K. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil 2: Symbiontische Termitenflagellaten. Mikrokosmos 98, 213-220.
58. Hausmann, K., Radek, R. (2009): Einzeller im Zusammenleben mit Vielzellern. Teil 3: Pansenciliaten. Mikrokosmos 98, 273-280.
59. Radek, R. (2009): Acidocalcisomen, Mitosomen und Apicoplasten als neue Zellorganellen. Biologie in unserer Zeit 4/2009 (39), 242-248.
60. Radek, R. (2009): Neue Zellorganellen: Acidocalcisomen, Mitosomen, Apicoplasten. Mikrokosmos 98, 342-346.
61. Mater, A., Radek, R. (2009): Diversität von Pansenciliaten aus einem Rind.     Mikrokosmos 98, 369-376.
62. Yaman, M., Radek, R., Aydın, Ç., Tosun, O., Ertürk, Ö. (2009): First record of the insect pathogenic alga Helicosporidium sp. (Chlorophyta: Trebouxiophyceae) infection in larvae and pupae of Rhizophagus grandis Gyll. (Coleoptera, Rhizophaginae) from Turkey. Journal of Invertebrate Pathology 102, 182-184. http://dx.doi.org/10.1016/j.jip.2009.07.006
63. Strassert, J.F.H., Desai, M.S., Brune, A., Radek, R. (2009): The true diversity of devescovinid flagellates in the termite Incisitermes marginipennis. Protist 160, 522-535. https://doi.org/10.1016/j.protis.2009.04.002
64. Yaman, M., Radek, R., Tosun, O., Ünal, S. (2009): Nosema raphidiae sp.n. (Microsporida, Nosematidae), a microsporidian pathogen of the predatory snake-fly Raphidia ophiopsis (Raphidioptera:Raphidiidae). Acta Protozoologica 48, 353-358.
65. Yaman, M., Radek, R., Weiser, J. (2010): Unikaryon phyllotretae sp. n. (Protista, Microspora), a new microsporidian pathogen of Phyllotreta undulata (Coleoptera; Chrysomelidae). European Journal of Protistology 46, 10-16. https://doi.org/10.1016/j.ejop.2009.07.001
66. Radek, R., Aydin, Ç, Tosun, O., Ertürk, Ö., Linde, A., Yaman, M. (2010) Pathogens of the bark beetle Dendroctonus micans and its predator Rhizophagus grandis from Turkey. Proceedings of the 43 Annual Meeting of the Society for Invertebrate Pathology, 11.-15.7.2010, Trabzon, Turkey, S. 22-31 in Symposium “Microsporidia and other pathogens in arthropods from the Eastern Mediterranean Region”.
67. Linde, A., Radek, R., Yaman, M. (2010): An overview on entomopathogenic protists from Turkey. Proceedings of the 43 Annual Meeting of the Society for Invertebrate Pathology, 11.-15.7.2010, Trabzon, Turkey, S. 14-21 in Symposium “Microsporidia and other pathogens in arthropods from the Eastern Mediterranean Region”.
68. Strassert, J. F. H., Desai, M. S., Radek, R., Brune, A. (2010): Identification and localization of the multiple bacterial symbionts of the termite gut flagellate Joenia annectens. Microbiology 156, 2068-2079. https://doi.org/10.1099/mic.0.037267-0
69. Desai, M. S., Strassert, J. F. H., Meuser, K., Hertel, H., Ikeda-Ohtsubo, W., Radek, R., Brune, A. (2010): Strict cospeciation of devescovinid flagellates and Bacteroidales ectosymbionts in the gut of dry-wood termites (Kalotermitidae). Environmental Microbiology 12, 2120-2132. https://doi.org/10.1111/j.1462-2920.2009.02080.x
70. Yaman, M., Radek, R., Weiser, J., Aydin, Ç. (2010): A microsporidian pathogen of the predatory beetle Rhizophagus grandis (Coleoptera: Rhizophagidae). Folia Parasitologica 57, 233-236.
71. Könecke, M., Radek, R. (2011): Gregarinen in Schaben. Mikrokosmos 100, 105-111.
72. Yaman, M. Radek, R., Özcan, N., Linde, A., Lipa, J. J. (2011): Ultrastructure, characteristic features and occurrence of Nosema leptinotarsae Lipa 1968, a microsporidian pathogen of Leptinotarsa decemlineata (Coleoptera: Chrysomelidae). Acta Parasitologica 56, 1-7.
73. Radek, R., Krüger, J., Yaman, M. (2011): Virenbefall von Kleidermottenlarven. Mikrokosmos 100, 311-317.
74. Radek, R., Wellmanns, D., Wolf, A. (2011): Two new species of Nephridiophaga (Zygomycota) in the Malpighian tubules of cockroaches. Parasitology Research 109, 473-482. https://doi.org/10.1007/s00436-011-2278-7
75. Yaman, M., Bekircan, Ç., Radek, R., Linde, A. (2012): The first record of nucleopolyhedrovirus isolated from the gypsy moth, Lymantria dispar (Lepidoptera, Lymantriidae) in Turkey. Türkiye Parazitoloji Dergisi 36, 92-95. http://dx.doi.org/10.5152/tpd.2012.22
76. Yaman, M., Radek, R. (2012): Menzbieria chalcographi, a new pathogen of the great spruce bark beetle, Dendroctonus micans (Kugelann) (Curculionidae, Scolytinae). Acta Parasitologica 57, 216-220. https://doi.org/10.2478/s11686-012-0033-6
77. Yaman, M., Radek, R., Linde, A. (2012): A new neogregarine pathogen of Rhizophagus grandis (Coleoptera: Monotomidae). North-Western Journal of Zoology 8, 353-357.
78. Strassert, J.F.H., Köhler, T., Wienemann, T.H.G., Ikeda-Ohtsubo, W., Faivre, N., Franckenberg, S., Plarre, R., Radek, R., Brune, A. (2013):‘Candidatus Ancillula trichonymphae’, a novel lineage of endosymbiotic Actinobacteria in termite gut flagellates of the genus Trichonympha. Environmental Microbiology14, 3259–3270 (2013). https://doi.org/10.1111/1462-2920.12012
79. Tamschick, S., Radek, R. (2013): Colonization of termite hindgut walls by oxymonad flagellates and prokaryotes in Incisitermes tabogae, I. marginipennis and Reticulitermes flavipes. European Journal of Protistology 49, 1-14. https://doi.org/10.1016/j.ejop.2012.06.002
80. Krämer, J., Radek, R. (2014): Pansenciliaten aus Schafen – Eine qualitative und quantitative Analyse. Mikrokosmos 103, 65-73.
81. Radek,R., StrassertJ. F. H., Krüger, J., Meuser,K., Scheffrahn, R. H., Brune,A. (2014): Phylogeny and ultrastructure of Oxymonas jouteli, a rostellum-free species, and Opisthomitus longiflagellatus sp. nov., oxymonadid flagellates from the gut of Neotermes jouteli. Protist 165, 384-399. https://doi.org/10.1016/j.protis.2014.04.003
82. Ndomo-Moualeu, A. F., Ulrichs, C., Radek, R., Adler, C. (2014): Structure and distribution of antennal sensilla in the Indianmeal moth, Plodia interpunctella (Hübner, 1813) (Lepidoptera: Pyralidae). Journal of Stored Product Research 59, 66-75. https://doi.org/10.1016/j.jspr.2014.05.003
83. Yaman, M., Becirkan, Ç., Radek, R. Linde, A. (2014): Nosema pieriae sp. n. (Microsporida, Nosematidae): A new microsporidian pathogen of the cabbage butterfly Pieris brassicae L. (Lepidoptera: Pieridae). Acta Protozoologica 53, 223-232.
84. Pilarska, D., Radek, R., Huang, W.-F., Takov, D., Linde, A., Solter, L.F. (2014):Review of the genus Endoreticulatus (Microsporidia, Encephalitozoonidae) with description of a new species isolated from the grasshopper Poecilimon thoracicus (Orthoptera: Tettigoniidae) and transfer of Microsporidium itiiti Malone to the genus. Journal of Invertebrate Pathology 124, 23-30. https://doi.org/10.1016/j.jip.2014.09.007
85. Radek, R., Kariton, M., Dabert, J., Alberti, G. (2015): Ultrastructural characterization of Acarispora falculifera n. gen., n. sp., a new microsporidium (Opisthokonta: Chytridiopsida) from the feather mite Falculifer rostratus (Astigmata: Pterolichoidea). Acta Parasitologica 60, 200-210.
86. Yaman, M., Radek, R. (2015): Mattesia weiseri sp. nov., a new neogregarine pathogen of the great spruce bark beetle, Dendroctonus micans (Coleoptera: Curculionidae, Scolytinae). Parasitology Research 114, 2951–2958. https://doi.org/10.1007/s00436-015-4497-9
87. Yaman, M., Acar, K.F., Radek, R. (2015): A nucleopolyhedrovirus from the Mediterranean flour moth, Ephestia kuehniella (Lepidoptera: Pyralidae).Applied Entomology and Zoology 50, 355-359. https://doi.org/10.1007/s13355-015-0342-y
88. Hausmann, K., Günther, G., Lehmann, D., Radek, R. (2016): On the enigmatic hook of the metaradiophryids (Alveolata, Ciliophora). Acta Protozoologica 55, 1-5. https://doi.org/10.4467/16890027AP.16.001.4042
89. Zheng, H., Dietrich, C., Radek, R., Brune, A. (2016): Endomicrobium proavitum, the first isolate of Endomicrobia class. nov. (phylum Elusimicrobia) – an ultramicrobacterium with an unusual cell cycle that fixes nitrogen with a Group IV nitrogenase. Environmental Microbiology 18, 191-204. https://doi.org/10.1111/1462-2920.12960/pdf
90. Yaman, M., Güngör, F. P., Güner, B. G., Radek, R., Linde, A (2016): First report and spore ultrastructure of Vairiomorpha plodiae (Opisthokonta: Microspora), from Plodia interpunctella (Lepidoptera: Pyralidae) in Turkey. Acta Parasitologica 61, 228-231. https://doi.org/10.1515/ap-2016-0032
91. Yaman, M., Eroğlu, M., Radek, R. (2016): Occurrence of a microsporidian infection in the predatory beetle Calosoma sycophanta L. (Coleoptera: Carabidae). Turkish Journal of Agriculture and Forestry 40, 420-424. https://doi.org/10.3906/tar-1507-42
92. Tegtmeier, D., Riese, C., Geissinger, O., Radek, R., Brune, A. (2016): Breznakia blatticola gen. nov. sp. nov. and Breznakia pachnodae sp. nov., two fermenting bacteria isolated from insect guts, and emended description of Erysipelotrichaceae. Systematic and Applied Microbiology 39, 319-329. http://dx.doi.org/10.1016/j.syapm.2016.05.003
93. Ikeda-Ohtsubo,W., Strassert,J.F.H., Köhler,T., Mikaelyan,A., Gregor, I., McHardy,A., Green Tringe, S., Hugenholtz, P., Radek, R., Brune, A. (2016): ‘Candidatus Adiutrix intracellularis’, an endosymbiont of termite gut flagellates, is the first representative of a deep-branching clade of ‘Deltaproteobacteria’ and a putative homoacetogen. Environmental Microbiology 18, 2548-2564. https://doi.org/10.1111/1462-2920.13234
94. Melina,S., Martono,E., Trisyono,Y. A., Moechtar, S., Radek,R. (2016): Morphology of adult Helopeltis bradyi (Heteroptera: Miridae) of Java, resolving a longstanding species uncertainty. North Western Journal of Zoology 12, 110-121.
95. Yaman, M., Radek, R. (2017): Ophryocystis anatoliensis sp. nov., a new neogregarine pathogen of the chrysomelid beetle Chrysomela populi. European Journal of Protistology 59, 26-33. https://doi.org/10.1016/j.ejop.2017.01.003
96. Pilarska, D., Takov, D., Hylis, M., Radek, R., Fiala, I., Solter, L., Linde, A. (2017): Natural occurrence of microsporidia infecting lepidoptera in Bulgaria. Acta Parasitologica 62, 858-869. https://doi.org/10.1515/ap-2017-0104
97. Radek, R., Wurzbacher, C., Gisder, S., Nilsson, H.R., Owerfeldt, A., Genersch, E., Kirk, P.M., Voigt, K. (2017): Morphologic and molecular data help adopting the insect-pathogenic nephridiophagids (Nephridiophagidae) among the early diverging fungal lineages, close to the Chytridiomycota.Mycokeys 25, 31-50.https://doi.org/10.3897/mycokeys.@.12446
98. Radek, R., Meuser, K., Strassert, J.F.H., Arslan, O., Teßmer, A., Šobotník, J., Sillam-Dussès, D., Nink, R.A., Brune, A. (2018): Exclusive gut flagellates of Serritermitidae suggest a major transfaunation event in lower termites: Description of Heliconympha glossotermitis gen. nov. spec. nov. Journal of Eukaryotic Microbiology 65, 77-92. https://doi.org/10.1111/jeu.12441
99. Tegtmeier, D., Belitz, A., Radek, R., Heimerl, T., Brune, A. (2018): Ereboglobus luteus gen. nov. sp. nov. from cockroach guts, and new insights into the oxygen relationships of the genera Opitutus and Didymococccus (Verrucomicrobia: Opitutaceae). Systematic and Applied Microbiology 41, 101-112. https://doi.org/10.1016/j.syapm.2017.10.005
100. Kobel-Höller, K., Gley, K., Jochinke, J., Heider, K., Fritsch, V.N., Nguyen, H.V.D., Lischke, T., Radek, R., Baumgrass, R., Mutzel, R., Thewes, S. (2018): Calcineurin silencing in Dictyostelium discoideum leads to cellular alterations affecting mitochondria, gene expression, and oxidative stress response. Protist 169, 584-602. https://doi.org/10.1016/j.protis.2018.04.004
101. González-Tortuero,E.,Rodríguez-Beltran, J., Radek, R., Blázquez J., Rodríguez-Rojas, A. (2018): Clay-induced DNA breaks as a path for genetic diversity, antibiotic resistance, and asbestos carcinogenesis. Scientific Reports 8, 1-10. https://doi.org/10.1038/s41598-018-26958-5
102. Davis,H. E., Meconcelli, S., Radek, R, McMahon, D.P. (2018): Termites shape their collective behavioural response based on stage of infection. Scientific Reports 8, 14433. https://doi.org/10.1038/s41598-018-32721-7
103. Wijayawardene, N.N., Pawlowska, J., Letcher, P.M., Kirk, P.M., Humber, R.A., Schüßler, A., Wrzosek, M., Muszewska, A., Okrasińska, A., Istel, Ł., Geşiorska, A., Mungai, P., Lateef, A.A., Rajeshkumar, K.C:, Singh, R.V., Radek, R., Walther, G., Wagner, L., Walker, C., Wijesundara, D.S.A., Papizadeh, M., Dolatabadi, S., Shenoy, B.D., Tokarev, Y.S., Lumyong, S., Hyde, K.D. (2018): Notes for genera: basal clades of Fungi (including Aphelidiomycota, Basidiobolomycota, Blastocladiomycota, Calcarisporiellomycota, Caulochytriomycota, Chytridiomycota, Entomophthoromycota, Glomeromycota, Kickxellomycota, Monoblepharomycota, Mortierellomycota, Mucoromycota, Neocallimastigomycota, Olpidiomycota, Rozellomycota and Zoopagomycota). Fungal Diversity 92, 43-129, https://doi.org/10.1007/s13225-018-0409-5
104. Yaman, M., Algi, G., Radek, R. (2019): Morphological, ultrastructural, and molecular identification of a new microsporidian pathogen isolated from Crepidodera aurata (Coleoptera, Chrysomelidae). Turkish Journal of Zoology 43, 407-415, https://doi.org/10.3906/zoo-1902-4
105. Radek, R., Meuser,K., Altinay,S., Lo,N., Brune, A. (2019): Novel lineages of oxymonad flagellates from the termite Porotermes adamsoni (Stolotermitidae): the new genera Oxynympha and Termitimonas. Protist 170, 125683, https://doi.org/10.1016/j.protis.2019.125683
106. Wijayawardene, N. N., K. D. Hyde, L. K. T. Al-Ani, L. Tedersoo, Danny Haelewaters, K. C. Rajeshkumar, R. L. Zhao, A. Aptroot, V Leontyev, D., R. K. Saxena, Y. S. Tokarev, D. Q. Dai, P. M. Letcher, S. L. Stephenson, D. Ertz, H. T. Lumbsch, M. Kukwa, V Issi, I., H. Madrid, A. J. L. Phillips, L. Selbmann, W. P. Pfliegler, E. Horvath, K. Bensch, P. M. Kirk, K. Kolarikova, H. A. Raja, R. Radek, V Papp, B. Dima, J. Ma, E. Malosso, S. Takamatsu, G. Rambold, P. B. Gannibal, D. Triebel, A. K. Gautam, S. Avasthi, S. Suetrong, E. Timdal, S. C. Fryar, G. Delgado, M. Reblova, M. Doilom, S. Dolatabadi, J. Z. Pawlowska, R. A. Humber, R. Kodsueb, I Sanchez-Castro, B. T. Goto, D. K. A. Silva, F. A. de Souza, F. R. Oehl, G. A. da Silva, I. R. Silva, J. Blaszkowski, K. Jobim, L. C. Maia, F. R. Barbosa, P. O. Fiuza, P. K. Divakar, B. D. Shenoy, R. F. Castaneda-Ruiz, S. Somrithipol, A. A. Lateef, S. C. Karunarathna, S. Tibpromma, P. E. Mortimer, D. N. Wanasinghe, R. Phookamsak, J. Xu, Y. Wang, F. Tian, P. Alvarado, D. W. Li, I Kusan, N. Matocec, A. Masic, Z. Tkalcec, S. S. N. Maharachchikumbura, M. Papizadeh, G. Heredia, F. Wartchow, M. Bakhshi, E. Boehm, N. Youssef, V. P. Hustad, J. D. Lawrey, A. L. C. M. A. Santiago, J. D. P. Bezerra, C. M. Souza-Motta, A. L. Firmino, Q. Tian, J. Houbraken, S. Hongsanan, K. Tanaka, A. J. Dissanayake, J. S. Monteiro, H. P. Grossart, A. Suija, G. Weerakoon, J. Etayo, A. Tsurykau, V. Vazquez, P. Mungai, U. Damm, Q. R. Li, H. Zhang, S. Boonmee, Y. Z. Lu, A. G. Becerra, B. Kendrick, F. Q. Brearley, J. Motiejunaite, B. Sharma, R. Khare, S. Gaikwad, D. S. A. Wijesundara, L. Z. Tang, M. Q. He, A. Flakus, P. Rodriguez-Flakus, M. P. Zhurbenko, E. H. C. McKenzie, M. Stadler, D. J. Bhat, J. K. Liu, M. Raza, R. Jeewon, E. S. Nassonova, M. Prieto, R. G. U. Jayalal, M. Erdogdu, A. Yurkov, M. Schnittler, O. N. Shchepin, Y. K. Novozhilov, A. G. S. Silva-Filho, E. Gentekaki, P. Liu, J. C. Cavender, Y. Kang, S. Mohammad, L. F. Zhang, R. F. Xu, Y. M. Li, M. C. Dayarathne, A. H. Ekanayaka, T. C. Wen, C. Y. Deng, O. L. Pereira, S. Navathe, D. L. Hawksworth, X. L. Fan, L. S. Dissanayake, E. Kuhnert, M. Thines (2020): Outline of Fungiand fungus-like taxa. Mycosphere 11(1), 1060–1456, ISSN 2077 7019, https://doi.org/10.5943/mycosphere/11/1/8
107. Strassert, J.F.H., Wurzbacher, C., Hervé, V., Antany, T., Brune, A., Radek, R. (2021): Long rDNA amplicon sequencing of insect‑infecting nephridiophagids reveals their affiliation to the Chytridiomycota and a potential to switch between hosts. Sci. Rep. 11, 396. https://doi.org/10.1038/s41598-020-79842-6 (open access)
108. Radek, R. (2021): Obituary. In memoriam: Norbert Hülsmann (1945–2020). European Journal of Protistology. 79, 125764. https://doi.org/10.1016/j.ejop.2020.125764
109. Yaman, M., Radek, R. (2021):Characteristic light and electron microscopic features of Adelina melolonthae, a coccidian pathogen of the European cockchafer, Melolontha melolontha ( Coleoptera: Scarabaeidae). Acta Parasitologica 66, 925-931. https://doi.org/10.1007/s11686-021-00363-x
110. Song, Y., Hervé, V., Radek, R., Pfeiffer, F., Zheng, H., Brune, A. (2021): Termite gut treponemes evolved from ancestral non-acetogenic spirochetes in cockroaches: description of Breznakiella homolactica gen. nov. sp. nov. (fam. ‘Termitinemataceae’). Environmental Microbiology 23, 4228–4245. https://doi.org/10.1111/1462-2920.15600
111. Voigt, K., James, T.Y., Kirk, P.M., Santiago, A.L.C.M. de A., Waldman, B., Griffith, G.W., Fu, M., Radek, R., Strassert, J.F.H., Wurzbacher, C., Jerônimo, G.H., Simmons, D.R., Seto, K., Gentekaki, E., Hurdeal, V.G., Hyde, K.D., Nguyen, T.T.T., Lee, H.B. (2021): Early-diverging fungal phyla: Taxonomy, species concept, ecology, distribution, anthropogenic impact, and novel phylogenetic proposals. Fungal Diversity 109, 59-98 (review in Special Issue). https://doi.org/10.1007/s13225-021-00480-y
112. Radek, R., Voigt, K., Kirk, P.M., Strassert, J.F.H., Lee, H.M. (2022): (2878) Proposal to conserve the name Nephridiophaga (Chytridiomycota) with a conserved type. Taxon 71, 471-472. https://doi.org/10.1002/tax.12698
113. Strassert, J.F.H., Rodríguez-Rojas, A., Kuropka, B., Krahl, J., Kaya, C., Pulat, H.-C., Nurel, M., Radek, R.(2022): Impact of Nephridiophaga (Chytridiomycota) infection on the fitness and immune response of the cockroach Blattella germanica. Journal of Invertebrate Pathology 192, 107769. https://doi.org/10.1016/j.jip.2022.107769
114. Song, Y., Pfeiffer, F., Radek, R., Hearne, C., Hervé, V., Brune, A. (2022): Comparative analysis of Brucepasteria parasyntrophica gen. nov., sp. nov. and Teretinema zuelzerae gen. nov., comb. nov. (Treponemataceae) reveals the importance of interspecies hydrogen transfer in the energy metabolism of spirochetes.Applied and Environmental Microbiology 8(14):e0050322. https://doi.org/10.1128/aem.00503-22
115. Yaman, M., Aydin, Ç., Linde, A., Radek, R. (2022): A new microsporidian pathogen, Vairimorpha gastrophysae sp. nov., isolated from Gastrophysa viridula (Coleoptera: Chrysomelidae). European Journal of Protistology 86, 125913. https://doi.org/10.1016/j.ejop.2022.125913
116. Radek, R., Walochnik, J. (2022): Die „Deutsche Gesellschaft für Protozoologie e. V." (DGP). Rundschau für Fleischhygiene und Lebensmittelüberwachung 7/2022, 247-249.
117. Radek, R., Platt, K., Öztas, D., Šobotník, J., Sillam-Dusses, D., Hanus, R., Brune, A. (2023): New insights into the coevolutionary history of termites and their gut flagellates: Description of Retractinympha glossotermitis gen. nov. sp. nov. (Retractinymphidae fam. nov.). Frontiers in Ecology and Evolution 11, 1111484. https://doi.org/10.3389/fevo.2023.1111484
118. Aumont, C., Beránková, T., McMahon, D.P. Radek, R., Akama, P.D., Sillam-Dussès, D., Šobotník, J. (2023): The ultrastructure of the rostral gland in soldiers of Verrucositermes tuberosus (Blattodea: Termitidae: Nasutitermitinae). Arthropod Structure & Development 73, 101238. https://doi.org/10.1016/j.asd.2023.101238
119. Noda, S., Kitade, O., Jasso-Selles, D., Taerum, S.J., Takayanagi, M., Radek, R., Lo, N., Ohkuma, M., Gile, G. (2023): Molecular phylogeny of Spirotrichonymphea (Parabasalia) with emphasis on Spironympha, Spirotrichonympha, and three new genera Pseudospironympha, Nanospironympha, and Brugerollina. Journal of Eukaryotic Microbiology XX, e12967. https://doi.org/10.1111/jeu.12967

Book chapters

1. Hausmann, K., Radek, R. (1993): A comparative survey on phagosome formation in protozoa. In: Membrane Traffic in Protozoa (H. Plattner, ed.), pp. 259-282, JAI Press Inc., Greenwich, Conneticut, USA.
2. Radek, R., Hausmann, K. (1994): Symbiontische Flagellaten im Termitendarm. In: Extremophile. Mikroorganismen in ausgefallenen Lebensräumen (K. Hausmann und B.P. Kremer, Hrsg.), pp. 325-339. VCH Verlagsgesellschaft, Weinheim.
3. Radek, R., Hausmann, K. (1995): Symbiontische Flagellaten im Darm von niederen Termiten. In: Biologie der Protozoen. Ein Praktikum zur Vielfalt der Formen und Lebensräume der Einzeller (R. Röttger, Hrsg.), pp. 74-79. Gustav Fischer Verlag, Stuttgart.
4. Radek, R., Hausmann, K. (1996): Chapter 6: Phagotrophy. In: Ciliates: Cells as organisms (K. Hausmann, P. Bradbury, eds.), pp. 197-219. Gustav Fischer Verlag, Stuttgart.
5. Brugerolle, G. Radek, R. (2006): Symbiotic protozoa of termites (chapter 13). In: Intestinal microorganisms of termites and other invertebrates (Series: Soil Biology) (H. König, A.Varma, eds.), pp. 243-269.Springer Verlag, Berlin.
6. Hausmann, K., Hülsmann, N., Radek, R. (2006): „Einzellige Eukaryota“, Einzeller. In: Westheide, W. und Rieger, R. (Hrsg.) Spezielle Zoologie, Teil 1: Einzeller und Wirbellose Tiere, S. 2–65, Elsevier, München.
7. Radek, R., Hausmann, K. (2009): Symbiotic flagellates in the gut of lower termites. In: Röttger, R., Foissner, W. (eds.) Courses in Protozoology, pp. 72-79, Shaker Verlag, Aachen.
8. Radek, R., Hausmann, K., Stockem, W. (2009): Amoeba proteus. In: Röttger, R., Foissner, W. (eds.) Courses in Protozoology, pp. 92-96, Shaker Verlag, Aachen.
9. Radek, R. (2010): Adhesion of bacteria to protists. In: König, H., Claus, H., Varma, A. (eds.) Prokaryotic cell wall compounds – Structure and biochemistry, pp. 429-456, Springer-Verlag, Berlin, Heidelberg.
10. Radek, R., Strassert, J.F.H., Brune, A. (in preparation): Symbionts of symbionts: Termite flagellates and their bacterial associations. In: Hausmann, K., Radek, R.: Cilia/flagella, ciliates/flagelles. Five decades of basic research. Schweitzerbart Science Publishers, Stuttgart

Books and Special Volumes of Journals

1. Hausmann, K., Hülsmann, N., Radek, R. (2003): Protistology. E. Schweitzerbart’sche Verlagsbuchhandlung, Stuttgart, S. 1–379. Chinesische Auflage 2007, Russische Auflage 2010, Koreanische Auflage 2011
2. Hausmann, K., Radek, R. (2006): Festschrift – 25 Jahre Deutsche Gesellschaft für Protozoologie. E. Schweitzerbart’sche Verlagsbuchhandlung, Stuttgart, S. 1–277.
3. Hausmann, K., Radek, R. (Hrsg.) (2008): 100 Jahre Mikrokosmos. Mikrokosmos 97, special volume, Elsevier, S. 1-64.

Film with publication

1. Radek, R., Hausmann, K., Haarhaus, D. (1994): Symbiotic Flagellates in Termites. Publication for the Scientific Film Biology 21, 153-171. Film C 1790 (1992) in cooperation with the Institute for the Scientific Film (IWF), Göttingen.