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We have analyzed the RNA polymerase density on the Leishmania donovani clpB gene locus. Our results show an even distribution of RNA polymerase over the clpB locus indicating an undiscriminative transcription. We conclude that, unlike the hsp70 genes, the clpB gene is not transcribed individually, but rather as part of a larger, polycistronic transcription unit.
Two new oceanic free-living heterotrophic Heterokonta species with picoplanktonic size (< 2 μm) are described. Symbiomonas scintillans Guillou et Chretiennot-Oinet gen. et sp. nov. was isolated from samples collected both in the equatorial Pacific Ocean and the Mediterranean Sea. This new species possesses ultrastructural features of the bicosoecids, such as the absence of a helix in the flagellar...
Complete nuclear-encoded SSU rRNA sequences have been obtained from three taxa of streptophyte green algae (Klebsormidium nitens, Nitella capillaris, Chaetosphaeridium globosum) and two strains of the scaly green flagellate Mesostigma viride. Phylogenetic analyses of 70 taxa of Viridiplantae (Chlorophyta and Streptophyta) and 57 taxa of streptophyte green algae and embryophyte plants using distance,...
Laboratory experiments were carried out to investigate the effect of food quality, measured as surface charge of the particles, on capture efficiency and ingestion rate by the heterotrophic dinoflagellate Oxyrrhis marina. Fluorescent particles in two size classes of around 1 and 4μm and of 7 different qualities were offered to the flagellate: carbohydrate and albumin particles, the algae Synechocystis...
Evidence is presented for the ubiquity of protist species. Using the example of protists that leave traces (siliceous scales) of their recent population growth, we show that most – perhaps all species in the genus Paraphysomonas, are ubiquitous. Of the species recorded in surveys carried out worldwide, we have identified 78% of their number in 0.1 cm 2 of sediment collected from a freshwater...
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