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Formation of Scales in Paraphysomonas vestita and the Inhibition of Growth by Germanium Dioxide *
Author(s) -
LEE ROBERT EDWARD
Publication year - 1978
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.1550-7408.1978.tb04389.x
Subject(s) - flagellate , euryhaline , chemistry , distilled water , salinity , biophysics , vesicle , seawater , biology , biochemistry , botany , ecology , membrane , chromatography
SYNOPSIS Paraphysomonas vestita (Stokes), a colorless flagellate, has silicified external scales. In this study EDAX analysis of the scales confirmed earlier experimental evidence that silicon is the major component of the scales. The scales are formed in the endoplasmic reticulum of the cytoplasm and carried to the plasmalemma in vesicles. The flagellate is euryhaline growing in a range from 2.6X seawater to near distilled water. From the salinity data it appears that Paraphysomonas vestita is the same as Paraphysomonas imperforata Lucas. A GeO 2 concentration of 2.0 mg l ‐1 (19.2 μM Ge) results in complete inhibition of growth.