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Concrétions Minérales Intracytoplasmiques chez les Ciliés
Author(s) -
FauréFremiet E.,
Gauchery M.
Publication year - 1957
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.1550-7408.1957.tb02493.x
Subject(s) - sponge spicule , calcium carbonate , cytoplasm , calcification , isotropy , calcium , carbonate , mineralogy , mineral , geology , biology , chemistry , paleontology , ecology , physics , optics , microbiology and biotechnology , pathology , medicine , organic chemistry
SUMMARY. Various species of ciliates are characterized by the formation and accumulation in the cytoplasm of mineral concretions which are refringent, isotropic or anisotropic. These cytoplasmic inclusions most often are composed of calcium carbonate; in several species, however, their nature remains partially or even totally undetermined. The isotropic calcium‐containing concretions often exhibit a definite shape; the calcium carbonate in this case appears to be bound to an organic substrate. The physiological role of the calcic concretions is not known; their characteristic presence in a given species is not necessarily related to ecological conditions. In a few species the calcification is localized in definite structures: spicules, skeletal plates, or otoliths of organelles supposedly sensory in nature.