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- W1996518051 abstract "The orientation of a body which has an anisotropic distribution of mass and which is suspended in water is biased by gravitational torque, so that the center of gravity lies below the center of buoyancy. Many species of unicellular swimming algae are gravitationally oriented in this manner. Their axis of propulsion is essentially fixed within their bodies, so that when the cells swim, they swim upwards. Gravitaxis is an exotaxis, which requires no sensory processing. Nevertheless, gravity affects the lives of these cells both individually and collectively. For single cells, gravity intervenes in the execution and mechanism of sense-dependent taxes, such as phototaxis, it provides for fail-safe locomotion toward the upper interface of their habitat, the source of light and air, and it may cause up-accumulation. Populations of single cells, swimming in the presence of gravity, are coupled through fluid- mechanical interactions which cause spatial and temporal patterns of fluid convection and cell concentration. These patterns modify the cell's environmental interactions, by facilitating downward migrations of cell populations, by mixing the embedding fluid and its contents, and by providing a collective mechanism for controlling light intensity at the individual cell level. Summarizing, gravity modulates the interaction of algal cells with each other and with their environment." @default.
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- W1996518051 date "1992-01-01" @default.
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- W1996518051 title "Theory and experimental results on gravitational effects on monocellular algae" @default.
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- W1996518051 doi "https://doi.org/10.1016/0273-1177(92)90261-u" @default.
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