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Flagellar Activity of the Colony Members of Volvox aureus Ehrbg. during Light Stimulation *
Author(s) -
HAND WILLIAM G.,
HAUPT WOLFGANG
Publication year - 1971
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1971.tb03333.x
Subject(s) - stimulation , microbiology and biotechnology , suspension (topology) , biology , biophysics , mechanism (biology) , neuroscience , physics , mathematics , quantum mechanics , homotopy , pure mathematics
SYNOPSIS. The flagellar behavior of the colonial Volvox aureus Ehrbg. was examined by placing 1.01 μ polystyrene particles in suspension with Volvox , and recording particle movement photomicrographically. When directional light stimulation was given, flagellar activity ceased in the anterior cells of the stimulated side. Such responses create unequal driving forces on the 2 sides of the colony, so that the colony turns toward the stimulated side. Dose response studies indicated a photoresponse gradient from front to rear in the colony, anterior cells being most responsive. The mechanism of gradient formation has yet to be determined.