1. Flagellates are positively chemotactic to a certain concentration of dissolved oxygen which is lower than that in water saturated with oxygen under atmospheric partial pressure. Consequently, when a small aquatic animal is held motionless between cover-slip and slide in a suspension of flagellates in water saturated with oxygen, the flagellates are attracted to those parts of the animal whic...

PCR analysis in two unusual occurrences of trichomoniasis, trichomonal empyema due to Trichomonas tenax and Trichomonas vaginalis in an infant urine sample, allowed us to obtain rapid and accurate trichomonad species identification. The weak sensitivity of wet preparations and the low viability of the flagellates can be remedied by the PCR method.

BACKGROUND The loss of photosynthesis has occurred often in eukaryotic evolution, even more than its acquisition, which occurred at least nine times independently and which generated the evolution of the supergroups Archaeplastida, Rhizaria, Chromalveolata and Excavata. This secondary loss of autotrophic capability is essential to explain the evolution of eukaryotes and the high diversity of pr...

Marine heterotrophic flagellates (HFs) form a diverse and ecologically relevant functional group of bacterial grazers nutrient remineralizers in oceanic waters. Despite playing crucial role marine biogeochemical cycles, there is still lack information on which specific taxa dominate HF assemblages what are their patterns distribution global context. In the present work, we addressed this issue ...