Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Investigation of the Effects of DDT and Other Chlorinated Hydrocarbon on the Growth of Euryhaline Microalgae.
Author Vada, Robert L. ;
CORP Author Maine Univ., Orono.
Year Published 1972
Report Number OWRR-A-021-ME; 05407,; A-021-ME(1)
Stock Number PB-229 680
Additional Subjects Alage ; Chlorohydrocarbons ; Pesticides ; Aquatic plants ; Cytology ; DDT ; Dieldrin ; Insecticides ; Growth ; Tolerances(Physiology) ; Photosynthesis ; Salinity ; Experimental data ; Euryhaline ; Water pollution effects(Plants) ; Porphyridium ; Platymonas subcordiformis
Library Call Number Additional Info Location Last
NTIS  PB-229 680 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 51p
The research project was initiated to determine the effects of chlorinated hydrocarbons at various concentrations on the growth of euryhaline microalgae, to determine if resistance to DDT occurs in algae with short generation times and with wide tolerances to naturally occurring environmental conditions, and to determine photosynthetic rates for algae treated with chlorinated hydrocarbons. Extensive studies on the effects of DDT on the growth of Platymonas subcordiformis indicate that some degree of resistance occurs naturally in the alga and that depressions in the carrying capacities and in growth rates, especially, in the form of lags, are common at sublethal levels. Growth rates were adversely affected by DDT concentrations at 100 to 200 ppb. At 500 ppb cells never recovered within the experimental period (7 to 10 days). Studies on the effects of DDT at varying salinity levels suggest that cells are less resistant to DDT at higher salinities (22 to 30 PPT).