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RECORD NUMBER: 578 OF 1675

OLS Field Name OLS Field Data
Main Title Effect of Prior Exposure on Sodium Uptake in Tadpoles Exposed to Low pH Water.
Author Freda, J. ; Dunson, W. A. ;
CORP Author Pennsylvania State Univ., University Park. Dept. of Biology.;Corvallis Environmental Research Lab., OR.
Year Published 1986
Report Number EPA/600/J-86/368;
Stock Number PB87-198826
Additional Subjects Acidity ; Exposure ; Frogs ; Water pollution ; Air pollution ; Sodium ; Concentration(Composition) ; pH ; Ion density(Concentration) ; Calcium ; Toxicity ; Reprints ; Rana catesbeiana ; Tadpoles ; Acid precipitation
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NTIS  PB87-198826 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 9p
Abstract Bullfrog tadpoles (Rana catesbeiana) were pre-exposed (7d) to 5 different solutions which varied in ionic composition and pH. Uni-directional sodium influx was then measured over a range of sodium concentrations (50-2000 micrometers) and at 2 pH's (4.0 and 5.8). Tadpoles pre-treated in either distilled water or pH 4.0 soft water exhibited higher sodium influx than animals pre-treated in pH 5.8 soft water. Pre-exposure to solutions high in calcium or sodium reduced sodium influx. Tadpoles pre-treated in pH 4.0 soft water exhibited an increased V sub max for sodium transport, while K sub m was unchanged relative to tadpoles pre-treated in pH 5.8 soft water. In contrast, K sub m was increased and V sub max was unchanged in tadpoles pre-exposed to high concentrations of calcium or sodium. Within each pre-exposure treatment, influx was inhibited in pH 4.0 test water relative to pH 5.8 test water. However, the magnitude of inhibition was lessened with increasing external concentrations of sodium. (Copyright (c) Springer-Verlag 1986.)
Supplementary Notes Pub. in Jnl. of Comparative Physiology B 156, p649-654 1986. Sponsored by Corvallis Environmental Research Lab., OR.
NTIS Title Notes Journal article.
Title Annotations Reprint: Effect of Prior Exposure on Sodium Uptake in Tadpoles Exposed to Low pH Water.
PUB Date Free Form c1986
Category Codes 68D; 68A; 57Z; 57Y
NTIS Prices PC A02/MF A01
Primary Description 600/02
Document Type NT
Cataloging Source NTIS/MT
Control Number 723226924
Origin NTIS
Type CAT