UNT Theses and Dissertations - 4 Matching Results

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Fate of Endothall in Aquatic Environments

Description: Hazard assessment of pesticides in aquatic environments requires accurate predictions of persistence and compartmentalization. A strategy for developing confidence in predictive fate models, such as the Exposure Analysis Modeling System (EXAMS) and the Simplified Lake and Stream Analysis model (SLSA), is to test the models using carefully chosen chemicals in semi-controlled and field situations. An objective of this approach would be to isolate the variability in a particular fate process and t… more
Date: December 1984
Creator: Reinert, Kevin H. (Kevin Howard)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Life History Energetics of The Red-Eared Turtle, Pseudemys scripta in North Central Texas

Description: A population of the red-eared slider, Pseudemys scripta, in north central Texas was studied from 1975 to 1980. A life history energy budget was developed for a typical individual in the population and the population dynamics were estimated. A growth model relating growth rate to mean plastron length (PL) was developed from recapture data and used to 1) establish age classes and 2) age individuals. Growth rate was highly variable in both sexes. Females grew more rapidly than males and attained a… more
Date: December 1984
Creator: Glidewell, Jerry Ray, 1945-
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Qualitative and Microcosm Predictions of Effects of Endothal for Control of Myriophyllum spicatum in Pat Mayse Lake, Texas

Description: Qualitative and microcosm models were used to predict effects of herbicide application for control of Myriophyllum spicatum. Predictions were compared to data from Pat Mayse Lake, a Texas reservoir, where localized areas were treated with endothall. Although milf oil was temporarily eliminated, when endothall was used according to manufacturer's directions, no ecologically significant direct or indirect effects were observed on nontarget species or abiotic water quality. Comparisons of the pred… more
Date: May 1984
Creator: Hinman, Mark L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Study of Polynuclear Aromatic Hydrocarbon Carcinogen Transport and Deoxyribonucleic Acid Repair

Description: This investigation addresses the interrelated problems of A) Uptake and vascular transport of lipophilic chemical carcinogens, and intracellular interactions between lipoproteins and carcinogens; B) Biochemical mechanisms by which polynuclear aromatic hydrocarbon carcinogens inhibit the replicative and repair DNA synthesis in cells. The results observed in this study suggest that ingested benzo(a)pyrene (BaP) enters the gastrointestinal lymphatic drainage sequestered within lymphatic lipoprotei… more
Date: December 1984
Creator: Joe, Cheol O., 1949-
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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