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Reversal of ciliary action in paramecium caudatum
Author(s) -
Mast S. O.,
Nadler J. Ernest
Publication year - 1926
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050430106
Subject(s) - paramecium caudatum , salt (chemistry) , biophysics , bivalent (engine) , biology , paramecium , cilium , salt solution , adsorption , metal , chemistry , biochemistry , genetics , organic chemistry
1 Monovalent cation salts induce reversal in the direction of the stroke of the cilia; bivalent and trivalent cation salts with a few exceptions do not. Some acids induce reversal, others do not. 2 The duration of reversed action varies with the kind of salt and with the concentration. As the concentration increases, the duration of reversed action increases to a maximum and then decreases to zero. 3 Bivalent and trivalent cation salts neutralize the effect of monovalent cation salts. The relative amount required varies with the kind of salt used and with the concentration. 4 The amount of a given salt required to neutralize another salt is not proportional to the concentration of the salt neutralized. Weber's law does not hold. 5 The results seem to indicate that ciliary reversal is associated with differential adsorption and consequent changes in electric potential, but that there are also other factors involved.