Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Effects of Nitrate and Phosphate Limitation on Cyclostat Growth of Two Freshwater Diatoms (Journal Version).
Author Gotham, Ivan J. ; Rhee, G-Yull ;
CORP Author New York State Dept. of Health, Albany. Div. of Labs. and Research.;Environmental Research Lab.-Duluth, MN.
Year Published 1982
Report Number EPA-R-804689; EPA-600/J-82-366;
Stock Number PB83-243550
Additional Subjects Diatoms ; Nitrates ; Phosphates ; Toxicology ; Cells(Biology) ; Fresh water ; Reprints ; Asterionella formosa ; Fragilaria crotonensis ; Cyclostat
Library Call Number Additional Info Location Last
NTIS  PB83-243550 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 9p
The effects of N and P limitation on cell division and on cellular contents of limiting and non-limiting nutrients were examined in cyclostat cultures of the freshwater diatoms Asterionella formosa and Fragilaria crotonensis. Nutrient-limited cell cycles of both species were readily entrained by a 14 h/10 h light/dark cycle. In F. crotonensis, the maxima relative to the onset of the light phase of the photocycle occurred at approximately -1 to +1 h for cell division, + or - 11 to 13 h for cell N, and +21 to 23 h for cell P. In A. formosa the maxima occurred at approximately +3 to 10 h for cell division and +2 to 4 h for cell N and cell P. Changes in culture dilution rate (integrated growth) and in the type of nutrient limiting growth did not significantly alter these times for either species.