Reference (Ref ID : 4800-4899)

Ref ID : 4800
Ewa Przybos; Studies on the Paramecium aurelia Species Complex in Spain (Ciliophora). Arch.Protistenkd. 140:151-156, 1991
Ref ID : 4801
Hans-Jurgen Voss; [Die Morphogenese von Notohymena rubescens Blatterer & Foissner, 1988 (Ciliophora, Oxytrichidae)] (The Morphogenesis of Notohymena rubescens Blatterer & Foissner, 1988 (Ciliophora, Oxytrichidae)). Arch.Protistenkd. 140:219-236, 1991
Ref ID : 4802
Manfred Wanner; [Zur Okologie von Thekamoben (Protozoa: Rhizopoda) in suddeutschen Waldern] (Studies on the Ecology of Testate Amoebae (Protozoa: Rhizopoda) in Forests of Southern Germany). Arch.Protistenkd. 140:237-288, 1991
Ref ID : 4803
Karl G. Grell; Corallomyxa nipponica n. sp. and the Phylogeny of Plasmodial Protists. Arch.Protistenkd. 140:303-320, 1991
Ref ID : 4804
Roman Janisch; Response of the Cortical Cytoskeleton of Paramecium caudatum to Merotomy. Arch.Protistenkd. 140:321-333, 1991
Ref ID : 4805
Andrew Rogerson, M. Polne-Fuller, and A. Gibor; Lectin Binding Sites in Marine Amoebae. Arch.Protistenkd. 141:3-11, 1992
Ref ID : 4806
Carl T. Friz; Taxonomic Analysis of the Free-Living Amoeba Using Isozymic Analysis. Arch.Protistenkd. 141:13-26, 1992
Ref ID : 4807
Marina A. Frenkel; Fine Structure of the Macronucleus in the Resting Cysts of the Ciliate Tillina magna. Arch.Protistenkd. 141:27-40, 1992
Ref ID : 4808
Sato Katsuyuki; Factors for Reconjugation in Euplotes patella. Arch.Protistenkd. 141:41-46, 1992
Ref ID : 4809
C.A. Groliere, S. Sefrioui, and Janine Dupy-Blanc; Bioconversion of Thiram (TMTD) by Tetrahymena pyriformis. Arch.Protistenkd. 141:135-140, 1992
Ref ID : 4810
Colin G. Ogden; The Ultrastructure of the Freshwater Testate Amoeba Difflugia rubescens Penard (Protozoa, Rhizopoda). Arch.Protistenkd. 141:159-170, 1992
Ref ID : 4811
Barry G. Warner and Jerry G. Chmielewski; Testate Amoebae (Protozoa) as Indicators of Drainage in a Forested Mire, Northern Ontario, Canada. Arch.Protistenkd. 141:179-183, 1992
Ref ID : 4812
Wilfried Schonborn; Comparative Studies on the Production Biology of Protozoan Communities in Freshwater and Soil Ecosystems. Arch.Protistenkd. 141:187-214, 1992
Ref ID : 4813
Hannes Augustin and Wilhelm Foissner; [Morphologie und Okologie einiger Ciliaten (Potozoa: Ciliophora) aus dem Belebtschlamm] (Morphology and Ecology of some Ciliates (Protozoa: Ciliophora) from Activated Sludge). Arch.Protistenkd. 141:243-283, 1992
Ref ID : 4814
Henry Tamar; Four Marine Species of Mesodinium (Ciliophora: Mesodiniidae) II. Mesodinium pulex Clap. & Lachm., 1858. Arch.Protistenkd. 141:284-303, 1992
Ref ID : 4815
Louis Beyens, Didier Chardez, D. De Baere, and Paul De Bock; The Testate Amoebae from the Sondre Stromfjord Region (West-Greenland): Their Biogeographic Implications. Arch.Protistenkd. 142:5-13, 1992
Ref ID : 4816
Karl G. Grell; A Species of Thalassomyxa (Promycetozoida) from the North Coast of Jamaica. Arch.Protistenkd. 142:15-27, 1992
Ref ID : 4817
Carl T. Friz; Taxonomic Analyses of Seven Species of Family Amoebidae by Isozymic Characterization of Electrophoretic Patterns and the Descriptions of a New Genus and a New Species: Metamoeba n. gen. Amoeba amazonas n. sp. Arch.Protistenkd. 142:29-40, 1992
Ref ID : 4818
Ana Sola, Susana Serrano, A. Guinea, and J.F. Longas; The Infraciliature of two Sapropelic Heterotrich Ciliates, Cirranter mobilis and Saprodinium dentatum (Ciliophora, Heterotrichida). Arch.Protistenkd. 142:51-57, 1992
Ref ID : 4819
Hubert Blatterer and Wilhelm Foissner; Morphology and Infraciliature of Some Cyrtophorid Ciliates (Protozoa, Ciliophora) from Freshwater and Soil. Arch.Protistenkd. 142:101-118, 1992
Ref ID : 4820
Kimmo Tolonen, Barry G. Warner, and Harri Vasander; Ecology of Testaceans (Protozoa: Rhizopoda) in Mires in Southern Finland: I. Autecology. Arch.Protistenkd. 142:119-138, 1992
Ref ID : 4821
Wilfried Schonborn; Adaptive Polymorphism in Soil-Inhabiting Testate Amoebae (Rhizopoda): Its Importance for Delimitation and Evolution of Asexual Species. Arch.Protistenkd. 142:139-155, 1992
Ref ID : 4822
Iveta Stefanova and Thomas Kalina; New and Rare Species of Silicia-Scaled Chrysophytes from Eastern Bohemia (Czechoslovakia). Arch.Protistenkd. 142:167-178, 1992
Ref ID : 4823
J. Lukavsky and V. Cepak; DAPI Fluorescent Staining of DNA Material in Cyanelles of the Rhizopoda Paulinella chromatophora Lauterb. Arch.Protistenkd. 142:207-212, 1992
Ref ID : 4824
Karl G. Grell; Supplementary Observations on Thalassomyxa jamaicensis Grell. Arch.Protistenkd. 142:213-217, 1992
Ref ID : 4825
Konrad Wolowski; Euglena ettlii Wolowski sp. nova (Euglenophyceae). Arch.Protistenkd. 143:173-176, 1993
Ref ID : 4826
Patricia L. Walne and Nancy S. Dawson; A Comparison of Paraxial Rods in the Flagella of Euglenoids and Kinetoplastids. Arch.Protistenkd. 143:177-194, 1993
Ref ID : 4827
Hans Machemer, Sigrun Machemer-Rohnisch, and Richard Braucker; Velocity and Graviresponses in Paramecium during Adaptation and Varied Oxygen Concentrations. Arch.Protistenkd. 143:285-296, 1993
Ref ID : 4828
Liane D. Platt and Klaus Hausmann; On the Ultrastructure of Bresslauides australis Blatterer & Foissner, 1988 (Ciliophora, Colpodea). Arch.Protistenkd. 143:297-310, 1993
Ref ID : 4829
Manfred Freiburg; Identification of Cell Surface Polypeptides of the Hypotrich Ciliate Euplotes octocarinatus. Arch.Protistenkd. 143:311-318, 1993
Ref ID : 4830
Sergei Fokin and Hans-Dieter Gortz; Caedibacter macronucleorum sp. nov., a Bacterium Inhabiting the Macronucleus of Paramecium duboscqui. Arch.Protistenkd. 143:319-324, 1993
Ref ID : 4831
Hans-Werner Kuhlmann; Giants in Lembadion bullinum (Ciliophora, Hymenostomata) - General Morphology and Inducing Conditions. Arch.Protistenkd. 143:325-336, 1993
Ref ID : 4832
Peter Eigner and Wilhelm Foissner; Divisional Morphogenesis in Orthoamphisiella stramenticola Eigner & Foissner, 1991 and O. grelli nov. spec. (Ciliophora, Hypotrichida). Arch.Protistenkd. 143:337-345, 1993
Ref ID : 4833
Jurgen Kusch; The Cell Cycle of Euplotes aediculatus (Ciliophora) at Various Population Densities. Arch.Protistenkd. 144:1-6, 1994
Ref ID : 4834
Igor B. Raikov; Somatic Cortical and Endoplasmic Fine Structure of Remanella granulosa Kahl (Ciliophora, Karyorelictida). Arch.Protistenkd. 144:7-16, 1994
Ref ID : 4835
Marina A. Frenkel; The Cyst Wall Formation in Tillina magna (Ciliophora, Colpodidae). Arch.Protistenkd. 144:17-29, 1994
Ref ID : 4836
Carl T. Friz; An Analysis of the Phylogenetic Relationships of Fifteen Taxa of Family Amoebidae. Arch.Protistenkd. 144:31-46, 1994
Ref ID : 4837
Violetta A. Sopina; Polymorphism of Esterases in Free-living Amoebidae. Arch.Protistenkd. 144:47-53, 1994
Ref ID : 4838
Karl G. Grell; Reticulamoeba gemmipara n. gen., n. sp., an "Amoebo-flagellate" with Reticulopodia and Zoosporogenesis. Arch.Protistenkd. 144:55-61, 1994
Ref ID : 4839
Eberhard Schnepf; Light and Electron Microscopical Observations in Rhynchopus coscinodiscivorus spec. nov., a Colorless, Phagotrophic Euglenozoon with Concealed Flagella. Arch.Protistenkd. 144:63-74, 1994
Ref ID : 4840
P. Albertano, G. Pinto, and A. Pollio; Ecophysiology and Ultrastructure of an Acidophilic Species of Ochromonas (Chrysophyceae, Ochromonadales). Arch.Protistenkd. 144:75-82, 1994
Ref ID : 4841
Kimmo Tolonen, Barry G. Warner, and Harri Vasander; Ecology of Testaceans (Protozoa: Rhizopoda) in Mires in Southern Finland: II. Multivariate Analysis. Arch.Protistenkd. 144:97-112, 1994
Ref ID : 4842
Eugen Lehle; [Die Auswirkungen von Dungung und Kalkung auf die Bodenciliaten (Protozoa: Ciliophora) eines Fichten-bestandes im Schwarzwald (Suddeutschland)] (The Effects of Fertilization and Liming on the soil Ciliates (Protozoa: Ciliopohora) of a Spruce Stand in the Black Forest (Southern Germany)). Arch.Protistenkd. 144:113-125, 1994
Ref ID : 4843
Wilhelm Foissner and Ilse Foissner; Fine Structure of Cosmocolpoda naschbergeri (Ciliophora, Colpodida). Arch.Protistenkd. 144:129-136, 1994
Ref ID : 4844
Karl G. Grell; The Feeding Community of Synamoeba arenaria n. gen., n. sp. Arch.Protistenkd. 144:143-146, 1994
Ref ID : 4845
K.P. Gaffal and S. el-Gammal; Mode of Division and Fate of the Flagellar/Basal Apparatus During the First Round of Cell Division of Polytoma papillatum. Arch.Protistenkd. 144:409-423, 1994
Ref ID : 4846
Vassil G. Golemansky; On Some Ecological Preferences of Marine Interstitial Testate Amoebas. Arch.Protistenkd. 144:424-432, 1994
Ref ID : 4847
Karl G. Grell; Reticulamoeba minor n. sp. and its Reticulopodia. Arch.Protistenkd. 145:3-9, 1995
Ref ID : 4848
N.J. Bowers and James R. Pratt; Estimation of Genetic Variation among Soil Isolates of Colpoda inflata (Stokes) (Protozoa: Ciliophora) Using the Polymerase Chain Reaction and Restriction Fragment Length Polymorphism Analysis. Arch.Protistenkd. 145:29-36, 1995
Ref ID : 4849
Wolfgang Petz; Morphology and Morphogenesis of Strombidium kryalis nov. spec. (Ciliophora, Strombidiida) from Antarctic Sea Ice. Arch.Protistenkd. 144:185-195, 1994
Ref ID : 4850
Ewa Przybos and Zofia Komala; The Paramecium aurelia Species Complex in the Sudeten Mountains. Arch.Protistenkd. 144:197-200, 1994
Ref ID : 4851
M.G. Chessa and M. Umberta Delmonte-Corrado; Encystment and Excystment in Colpoda inflata: Macronuclear DNA and Total Protein Content Quantitative Variations. Arch.Protistenkd. 144:207-211, 1994
Ref ID : 4852
Nancy S. Dawson and Patricia L. Walne; Evolutionary Trends in Euglenoids. Arch.Protistenkd. 144:221-225, 1994
Ref ID : 4853
Giovanna Rosati; Entry of Foreign Bacteria and of its Own Epibionts (Epixenosomes) into an Hypotrichous Ciliate, Euplotidium itoi, by Cortical Invaginations. Arch.Protistenkd. 144:283-288, 1994
Ref ID : 4854
Wilhelm Foissner; Pentahymena corticicola nov. gen., nov. spec., a New Colpodid Ciliate (Protozoa, Ciliophora) from Bark of Acacia Trees in Costa Rica. Arch.Protistenkd. 144:289-295, 1994
Ref ID : 4855
M. Bamdad, C.A. Groliere, Janine Dupy-Blanc, and Lucien David; Toxicity of Two Pairs of Epimeric Ionophorous Antibiotics Towards Tetrahymena pyriformis. Structure-Activity Relationship. Arch.Protistenkd. 144:297-307, 1994
Ref ID : 4856
Vassil G. Golemansky; [Thecamoebiens (Rhizopoda: Testacea) d'Hygropsammon Littoral de Trois Lacs Macedoniens d'Origine Tectonique: Ohrid, Prespa et Doiran] (Testate Amoebas (Rhizopoda: Testacea) from the Hygropsammon Littoral of Three Tectonic Macedonian Lakes: Ohrid, Prespa and Doiran). Arch.Protistenkd. 144:309-313, 1994
Ref ID : 4857
Karl G. Grell; Thalassomyxa canariensis n. sp. from a Tide Pool of Tenerife (Canary Islands). Arch.Protistenkd. 144:319-324, 1994
Ref ID : 4858
Igor B. Raikov and Valentina G. Kovaleva; The Nuclear Complexes ("Composite Nuclei") in the Genus Tracheloraphis: a Comparative Ultrastructural Study. Arch.Protistenkd. 144:329-342, 1994
Ref ID : 4859
L. Arregui, Susana Serrano, and Almudena Guinea; Microtubular Elements of the Marine Antarctic Ciliate Euplotes focardii (Ciliophora, Hypotrichia). Arch.Protistenkd. 144:357-364, 1994
Ref ID : 4860
V. Balik; On the Soil Testate Amoebae Fauna (Protozoa: Rhizopoda) of the Spitsbergen Islands (Svalbard). Arch.Protistenkd. 144:365-372, 1994
Ref ID : 4861
Wilhelm Foissner; Tropical Protozoan Diversity: 80 Ciliate Species (Protozoa, Ciliophora) in a Soil Sample from a Tropical Dry Forest of Costa Rica, with Descriptions of four New Genera and seven New Species. Arch.Protistenkd. 145:37-79, 1995
Ref ID : 4862
Igor B. Raikov and Valentina G. Kovaleva; Comparative Ultrastructure of the Cytoplasm in Species of the Genus Tracheloraphis (Ciliophora: Karyorelictida) I. Somatic Cortex. Arch.Protistenkd. 145:80-93, 1995
Ref ID : 4863
Anatoly A. Bobrov, Sergei B. Yazvenko, and Barry G. Warner; Taxonomic and Ecological Implications of Shell Morphology of Three Testaceans (Protozoa: Rhizopoda) in Russia and Canada. Arch.Protistenkd. 145:119-126, 1995
Ref ID : 4864
Angelika Preisfeld and Hans Georg Ruppel; Detection of Sialic Acid and Glycosphingolipids in Euglena gracilis (Euglenozoa). Arch.Protistenkd. 145:251-260, 1995
Ref ID : 4865
Igor B. Raikov and Valentina G. Kovaleva; Comparative Ultrastructure of the Cytoplasm in Species of the Genus Tracheloraphis (Ciliophora: Karyorelictida) II. Endoplasmic Organelles and Genesis of Rhabdocysts. Arch.Protistenkd. 146:1-11, 1995
Ref ID : 4866
J.M. Balczon and James R. Pratt; A Comparison of Methods for Estimating Short-Term Feeding Rates of Algivorous Ciliated Protozoa. Arch.Protistenkd. 146:49-58, 1995
Ref ID : 4867
Mercedes Martin-Cereceda, Susana Serrano, and Almudena Guinea; Occurrence of Acineria uncinata in Activated Sludge Plants: Morphology and Relationship with Physico-Chemical Plant Parameters. Arch.Protistenkd. 146:79-84, 1995
Ref ID : 4868
Genoveva Esteban, Tom Fenchel, and Bland J. Finlay; Diversity of Free-Living Morphospecies in the Ciliate Genus Metopus. Arch.Protistenkd. 146:137-164, 1995
Ref ID : 4869
Igor B. Raikov and Valentina G. Kovaleva; Comparative Ultrastructure of the Cytoplasm in Species of the Genus Tracheloraphis (Ciliophora, Karyorelictida). III. Buccal Apparatus. Arch.Protistenkd. 146:181-190, 1995
Ref ID : 4870
I. Finger, A. Lynn, and M. Bernstein; Identification of Regulators of Paramecium Surface Antigen Expression and of Regulator-Antigen Complexes. Arch.Protistenkd. 146:207-218, 1995
Ref ID : 4871
Louis Beyens and Didier Chardez; An Annotated List of Testate Amoebae Observed in the Arctic between the Longitudes 27 degrees E and 168 degrees W. Arch.Protistenkd. 146:219-233, 1995
Ref ID : 4872
J. Ekebom, David J. Patterson, and N. Vors; Heterotrophic Flagellates from Coral Reef Sediments (Great Barrier Reef, Australia). Arch.Protistenkd. 146:251-272, 1995/96
Ref ID : 4873
T. Cavalier-Smith, E.E. Chao, C.E. Thompson, and S.L. Hourihane; Oikomonas, a Distinctive Zooflagellate Related to Chrysomonads. Arch.Protistenkd. 146:273-279, 1995/96
Ref ID : 4874
Alexey V. Smirnov; Stygamoeba regulata n. sp. (Rhizopoda) - a Marine Amoeba with an Unusual Combination of Light-Microscopical and Ultrastructural Features. Arch.Protistenkd. 146:299-307, 1995/96
Ref ID : 4875
Wilhelm Foissner; The Infraciliature of Cryptopharynx setigerus Kahl, 1928 and Apocryptopharynx hippocampoides nov. gen., nov. spec. (Ciliophora, Karyorelictea), with an Account on Evolution in Loxodid Ciliates. Arch.Protistenkd. 146:309-327, 1995/96
Ref ID : 4876
Pilar Calvo and M. De Miguel; Study of Histriculus cavicola Cyst Wall Using Different Lectins. Arch.Protistenkd. 146:329-339, 1995/96
Ref ID : 4877
I. Finger, D. Audi, M. Bernstein, S. Voremberg, K. Harkins, M. Birnbaum, A. Lynn, and M. Lawlor; Switching of Paramecium Surface Antigen Types with Purified Antigen and Conditioned Medium Containing 70 kD Proteins. Arch.Protistenkd. 146:373-381, 1995/96
Ref ID : 4878
Johanna Ikavalko, Helge Abildhauge Thomsen, and Marina Carstens; A Preliminary Study of NE Greenland Shallow Meltwater Ponds with Particular Emphasis on Loricate and Scale-covered Forms (Choanoflagellida, Chrysophyceae sensu lato, Synurophyceae, Heliozoea), Including the Descriptions of Epipyxis thamnoides sp. nov. and Pseudokephyrion poculiforme sp. nov. (Chrysophyceae). Arch.Protistenkd. 147:29-42, 1996
Ref ID : 4879
K.A. Mikrjukov; Revision of the Genera and Species Composition of Lower Centroheliozoa I. Family Heterophryidae Poche. Arch.Protistenkd. 147:107-113, 1996
Ref ID : 4880
Igor B. Raikov and Valentina G. Kovaleva; Fine Structure of the Nuclei of the Karyorelictean Ciliate Tracheloraphis flexuosus from the Japan Sea. Arch.Protistenkd. 147:173-180, 1996
Ref ID : 4881
Genoveva F. Esteban and Bland J. Finlay; Morphology and Ecology of the Cosmopolitan Ciliate Prorodon viridis. Arch.Protistenkd. 147:181-188, 1996
Ref ID : 4882
Alexey V. Smirnov and Tom Fenchel; Vahlkampfia anaerobica n. sp. and Vannella peregrinia n. sp. (Rhizopoda) - Anaerobic Amoebae from a Marine Sediment. Arch.Protistenkd. 147:189-198, 1996
Ref ID : 4883
Phillip E. Ryals; Protein Prenylation in Tetrahymena. Arch.Protistenkd. 147:199-204, 1996
Ref ID : 4884
K.A. Mikrjukov; Revision of Genera and Species Composition of Lower Centroheliozoa. II. Family Raphidiophryidae n. fam. Arch.Protistenkd. 147:205-212, 1996
Ref ID : 4885
Alastair G.B. Simpson, John Van Den Hoff, Catherine Bernard, Harry R. Burton, and David J. Patterson; The Ultrastructure and Systematic Position of the Euglenozoon Postgaardi mariagerensis, Fenchel et al. Arch.Protistenkd. 147:213-225, 1996/97
Ref ID : 4886
T. Cavalier-Smith and E.E. Chao; Sarcomonad Ribosomal RNA Sequences, Rhizopod Phylogeny, and the Origin of Euglyphid Amoebae. Arch.Protistenkd. 147:227-236, 1996/97
Ref ID : 4887
T. Cavalier-Smith; Amoeboflagellates and Mitochondrial Cristae in Eukaryote Evolution: Megasystematics of the New Protozoan Subkingdoms Eozoa and Neozoa. Arch.Protistenkd. 147:237-258, 1996/97
Ref ID : 4888
H. Norbert Lanners; Posttraumatic Somatic Macronuclear Reorganization in Heliophrya erhardi, Suctoria, Ciliata (With Notes on Regeneration of Tentacles and Pulsating Vacuoles). Arch.Protistenkd. 147:259-263, 1996/97
Ref ID : 4889
Weibo Song, Alan Warren, and Xiaozhong Hu; Morphology and Morphogenesis of Pseudoamphisiella lacazei (Maupas, 1883) Song, 1996 with Suggestion of Establishment of a New Family Pseudoamphisiellidae nov. fam. (Ciliophora, Hypotrichida). Arch.Protistenkd. 147:265-276, 1996/97
Ref ID : 4890
Stefanie F. Kuhn; Rhizamoeba schnepfii sp. nov., a Naked Amoeba Feeding on Marine Diatoms (North Sea, German Bight). Arch.Protistenkd. 147:277-282, 1996/97
Ref ID : 4891
Alexey V. Smirnov; Two New Species of Marine Amoebae: Hartmannella lobifera n. sp. and Korotnevella nivo n. sp. (Lobosea, Gymnamoebida). Arch.Protistenkd. 147:283-292, 1996/97
Ref ID : 4892
Paola Ramoino; Membrane Supply and Food Vacuole Formation in Paramecium primaurelia. Arch.Protistenkd. 147:323-329, 1996/97
Ref ID : 4893
Weibo Song and Gabriele Packroff; [Taxonomische Untersuchungen an marinen Ciliaten aus China mit Beschreibungen von zwei neuen Arten, Strombidium globosaneum nov. spec. und S. platum nov. spec. (Protozoa, Ciliophora)] (Taxonomy and Morphology of Marine Ciliates from China with Description of Two New Species, Strombidium globosaneum nov. spec. and S. platum nov. spec. (Protozoa, Ciliophora)). Arch.Protistenkd. 147:331-360, 1996/97
Ref ID : 4894
Helmut Berger and Wilhelm Foissner; Cladistic Relationships and Generic Characterization of Oxytrichid Hypotrichs (Protozoa, Ciliophora). Arch.Protistenkd. 148:125-155, 1997
Ref ID : 4895
Ewa Przybos and Sergei Fokin; Species of the Paramecium aurelia Complex Sonneborn in Germany. Arch.Protistenkd. 148:167-172, 1997
Ref ID : 4896
Jose Luis Olmo and Carmen Tellez; New Aspects of the Morphology and Morphogenesis of Gonostomum strenua Engelmann, 1862 (Ciliophora, Hypotrichida). Arch.Protistenkd. 148:191-197, 1997
Ref ID : 4897
Nicolae Dragos, Leontin Stefan Peterfi, and Cristina Popescu; Comparative Fine Structure of Pellicular Cytoskeleton in Euglena Ehrenberg. Arch.Protistenkd. 148:277-285, 1997
Ref ID : 4898
Alastair G.B. Simpson; The Identity and Composition of the Euglenozoa. Arch.Protistenkd. 148:318-328, 1997
Ref ID : 4899
Andre-Denis G. Wright and Denis H. Lynn; Maximum Ages of Ciliate Lineages Estimated Using a Small Subunit rRNA Molecular Clock: Crown Eukaryotes Date Back to the Paleoproterozoic. Arch.Protistenkd. 148:329-341, 1997