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• W1979133035 startingPage "18" @default.
• W1979133035 abstract "The effects of copper, mercury, cadmium and lead on the gravitactic orientation of the photosynthetic flagellate Euglena gracilis were investigated. The first two heavy metals reverse the direction of downward swimming (positive gravitaxis) in young cultures (up to 8 days) to an upward swimming (negative gravitaxis); cadmium produced a less pronounced effect. Higher concentrations of heavy metals decrease the precision of orientation as compared to the control due to frequent deviations of the cells from straight paths. Higher concentrations also decrease the swimming velocity of the populations. When the cells were growing in the presence of the heavy metal, copper was effective at > or = 50 microM, cadmium at > or = 3 microM and mercury at > or = 1 microM. Since lead formed insoluble precipitations with the acetate in the growth medium it was tested after the cells were transferred into Tris buffer. Under these conditions lead did not affect the direction of movement or the precision of orientation up to a concentration of 300 microM in the time up to 24 h after the addition of the heavy metal. However, high concentrations of lead strongly decreased the swimming speed of the cells, which was partially reversed with time." @default.
• W1979133035 created "2016-06-24" @default.
• W1979133035 creator A5008376263 @default.
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• W1979133035 date "1994-02-01" @default.
• W1979133035 modified "2023-10-16" @default.
• W1979133035 title "Effects of heavy metals on motility and gravitactic orientation of the flagellate, Euglena gracilis" @default.
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• W1979133035 doi "https://doi.org/10.1016/s0932-4739(11)80194-x" @default.
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• W1979133035 hasPublicationYear "1994" @default.
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