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 Department: Department of Biology
 Collection: UNT Theses and Dissertations
Electron Microscopy of Vesicles Present in Bacterial Lysates of Escherichia Coli

Electron Microscopy of Vesicles Present in Bacterial Lysates of Escherichia Coli

Date: August 1966
Creator: Shaw, James Elwood
Description: It is the purpose of this thesis to report further studies on the vesicles appearing in phage lysates of Escherichia coli, phage attachment to these vesicles, and the presence of similar vesicles in lysozyme and penicillin lysed cultures.
Contributing Partner: UNT Libraries
Endogenous Levels of Indole-3-Acetic Acid in Synchronously Grown Chlorella Pyrenoidosa

Endogenous Levels of Indole-3-Acetic Acid in Synchronously Grown Chlorella Pyrenoidosa

Date: August 1971
Creator: Grotbeck, Laurence Merritt
Description: The purpose of this study was to determine the endogenous levels of indole-3-acetic acid throughout the life cycle of Chlorella pyrenoidosa, and to show a correlation between onset of cell division and IAA levels.
Contributing Partner: UNT Libraries
Estimated Extent and Fate of Chlorinated Solvent Contamination in the Soil of the Naval Air Station, Dallas, Texas

Estimated Extent and Fate of Chlorinated Solvent Contamination in the Soil of the Naval Air Station, Dallas, Texas

Date: August 1998
Creator: Trescott, Jill V. (Jill Virginia)
Description: This thesis estimates the spatial extent of chlorinated solvent contamination of the soil at the Naval Air Station, Dallas, then estimates the fate and transport of these contaminants, over time, using the Soil Transport and Fate database and the Vadose-Zone Interactive Processes (VIP) modeling software. Geostatistical analysis identifies two areas with serious chlorinated solvent contamination. Fate and transport modeling estimates that this contamination will degrade and disperse from the soil phase to below regulatory limits within one year, although there is a risk of groundwater contamination. Contaminants are estimated to persist in the water and air phases of the soil. Further sampling is recommended to confirm the results of this study.
Contributing Partner: UNT Libraries
Eutrophic Levels of Different Areas of a Reservoir: A Comparative Study

Eutrophic Levels of Different Areas of a Reservoir: A Comparative Study

Date: August 1970
Creator: Hendricks, Albert C.
Description: It was the purpose of this investigation to attempt to demonstrate if differences in eutrophic levels existed among selected areas of Garza-Little Elm, and to demonstrate the role that sediments play in affecting eutrophication.
Contributing Partner: UNT Libraries
Evaluation in Soil Moisture in Soil and Water Conservation Practices in Denton, Texas

Evaluation in Soil Moisture in Soil and Water Conservation Practices in Denton, Texas

Date: 1940
Creator: Rylander, Halley G.
Description: This investigation has attempted to show that soil and water conservation practices do increase the amount of soil moisture in five of Denton County, Texas soils: Denton clay, Durant clay, San Saba clay, Kirvin fine sandy loam, and Tabor fine sandy loam.
Contributing Partner: UNT Libraries
Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

Date: May 1996
Creator: Baerenklau, Amy L. (Amy Lyn)
Description: The City of Denton Pecan Creek Wastewater Treatment Facility has periodically failed effluent toxicity testing. A Toxicity Identification Evaluation has determined that Diazinon in the effluent is contributing to the observed toxicity. Chlorpyrifos is also implicated as a factor. The City of Denton constructed a half acre experimental wetland to remove Diazinon related toxicity. Results from spiking and microcosm experiments indicate that the wetland can reduce the Diazinon.
Contributing Partner: UNT Libraries
An Evaluation of the United States Soil Conservation Service Program of Grassland Recovery on the Land Utilization Project in Wise county, Texas

An Evaluation of the United States Soil Conservation Service Program of Grassland Recovery on the Land Utilization Project in Wise county, Texas

Date: August 1952
Creator: Hyman, Ruel Richard
Description: This investigation was undertaken in order to evaluate the United States Soil Conservation Service program of grassland recovery on the land utilization project in Wise County, Texas.
Contributing Partner: UNT Libraries
Examining the Shade/flood Tolerance Tradeoff Hypothesis in Bottomland Herbs Through Field Study and Experimentation

Examining the Shade/flood Tolerance Tradeoff Hypothesis in Bottomland Herbs Through Field Study and Experimentation

Date: May 2012
Creator: Sloop, Jordan
Description: While there is growing evidence that shade/flood tolerance tradeoffs may be important in distributions of bottomland hardwood trees and indications that they should apply to herbs, no studies have definitively explored this possibility. Four years of field data following historic flooding were supplemented with a greenhouse experiment designed to identify interactions congruent with tradeoffs. Fifteen bottomland species were grown in two levels of water availability and three levels of shade over 10 weeks. Results indicate responses of Fimbristylis vahlii and Ammannia robusta are consistent with tradeoffs. Modification of classical allometric responses to shade by substrate saturation indicates a potential mechanism for the tradeoff in A. robusta. Responses indicating potential for increased susceptibility to physical flooding disturbance are also discussed.
Contributing Partner: UNT Libraries
Extracts of Garden Vegetables as Sources of Nutrition for Various Microorganisms

Extracts of Garden Vegetables as Sources of Nutrition for Various Microorganisms

Date: January 1954
Creator: DuBois, Kenneth Guinn
Description: This study was undertaken in order to determine whether the extracts of common garden vegetables could be incorporated into simple, economical culture media which might be used for the growth and cultivation of at least some of the more commonly used microorganisms.
Contributing Partner: UNT Libraries
Extracts of Tree Leaves as Sources of Nutrition for Various Microorganisms

Extracts of Tree Leaves as Sources of Nutrition for Various Microorganisms

Date: 1952
Creator: Watkins, Bill Lewis
Description: The purpose of this investigation is to determine the possible presence and the extent of nutritional material in the extracts of the green leaves of a selected group of common trees in an effort to devise simpler and more economical, yet useful and satisfactory, culture media for the use in bacteriological laboratories, particularly those on the secondary level.
Contributing Partner: UNT Libraries