positive tropism

positive tropism

movement towards the source of a stimulus.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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There was, however, positive tropism for fresh bones, mainly those with thin cortical bone, cancellous bone of epiphysis containing flesh, and marrow.
This microorganism has positive tropism for several human organs and tissues, with complex clinical implications.

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