. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FRESHWATER MUSSEL PARACELLULAR PERMEABILITY 175. Figure 1. Transmission electron micrographs of gills from Corbicula Jiuminea (A-D) and Toxolasma texasensis (E-G) exposed to solutions containing mM lanthanum. All sections are unstained, and the apical surface is at the top of each micrograph. The calibration bar for all micrographs is at the bottom right comer. (A) Gill epithelium from a specimen that was exposed to lanthanum in pondwater for 12 h (control). A small deposit of electron-dense lanthanum precipit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FRESHWATER MUSSEL PARACELLULAR PERMEABILITY 175. Figure 1. Transmission electron micrographs of gills from Corbicula Jiuminea (A-D) and Toxolasma texasensis (E-G) exposed to solutions containing mM lanthanum. All sections are unstained, and the apical surface is at the top of each micrograph. The calibration bar for all micrographs is at the bottom right comer. (A) Gill epithelium from a specimen that was exposed to lanthanum in pondwater for 12 h (control). A small deposit of electron-dense lanthanum precipitate is in the lateral (paracellular) space between cells in the center of the micrograph (arrowhead); bar = ^m. (B) Gill epithelium from an animal that was exposed to 100 mM sucrose in pondwater for 2 h. Small amounts of lanthanum deposits are noticeable in the space between cells (arrowheads); bar = ^lm. (C) Gill epithelium from an animal that was exposed to 100 mM sucrose in pondwater for 12 h. Extensive electron-dense lanthanum deposits are present in the space between cells (arrowheads); bar = ^m. (D) A different region of the same tissue appears more condensed, and a series of lanthanum-containing "blisters" are seen in the lateral membrane region between the epithelial cells (arrows). These blisters may appear as vesicles that are incorporating portions of lateral membranes; bar = nm. (E) Gill epithelium from a T. texasensis specimen that was exposed to lanthanum in pondwater for 12 h (control). Close to the bottom of the micrograph are lanthanum deposits in the lateral space between cells (arrowheads); bar = (F) Gill epithelium from an animal that was exposed to 100 mM sucrose in pondwater for 2 h. Electron-dense lanthanum deposits are present in the paracellular space between cells (arrowheads); bar = fim. (G) Gill epithelium from an animal that was exposed to 100 mM sucrose in pondwater for 12 h. Extensive electron-dense prec
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