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in place name: "United States - Texas - Denton County - Denton"  
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Evaluation of a Constructed Wetland to Reduce Toxicity from Diazinon at the Pecan Creek Wastewater Treatment Plant, Denton, TX

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.
Date: May 1996
Creator: Baerenklau, Amy L. (Amy Lyn)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Primary Productivity and Nutrient Relationships in Garza-Little Elm Reservoir

Description: A large, multi-basin, reservoir (Garza-Little Elm Reservoir) in north central Texas was studied to determine the relative effects of various parameters on primary productivity. The basins were impounded several years apart,thus allowing the influence of age on water chemistry and biota to be considered. Another principal influence on water quality was secondary sewage effluent that entered one basin from a nearby source.
Date: May 1973
Creator: Smith, Jerry Allen
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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The Effects of Organic Surface Amendments on Soil Nutrients and Initial Tree Establishment

Description: This study examined the effects of replicating woodland soil surface horizonation on the nutrient status of underlying soils and the initial establishment and growth of trees. A total of 283 container grown trees were planted in a bufferzone around a future landfill site. Control amendments consisted of an 8 cm layer (0.5 m3) of wood chips applied in a circular area of 4.6 m2 around the trees' planting pit. For the treatment, a 2.5 cm layer of composted biosolids (0.15 m3 or 80 Mg/ha) was appli… more
Date: May 1999
Creator: Thuesen, Kevin (Kevin Andrew)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Sanitary Aspects of the Swimming Pool of North Texas State Teachers College, Denton, Texas

Description: This investigation was conducted in order to show that insanitary conditions may exist in the swimming pool at North Texas State Teachers College provided the proper precautions are not taken; and, in contrast that this pool can be sanitary and entirely safe when operated and used according to the necessary sanitary specifications.
Date: 1943
Creator: Self, Louise
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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The Dynamics of a Planktonic Microcrustacean Community in a Small North Central Texas Pond Ecosystem

Description: Seven species of planktonic microcrustacea were identified from the North Texas State University Golf Course Pond. Total adult microcrustacean community density, biomass and biocontent, and seasonal cycles of each species were compared with northern populations. Species diversity and evenness indices were highest in summer and lowest in spring. Variations in microcrustacean density showed a positive correlation with density of phytoplankton. Temperature had a direct effect on metabolic rates of… more
Date: December 1976
Creator: Smith, George Arthur
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Microflora Found in a Selected Group of Food Products Enclosed in a Protective Wrapper

Description: The purposes of this study are, first, to determine relative numbers and predominant types of bacterial organisms in the various food products studied; second, to evaluate the efficiency of the paper coverings of these foods; and third, to determine whether these products are potential sources of food poisoning.
Date: 1949
Creator: Ogden, William H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Solution for High Bacterial Counts in a Local Dairy, Denton, Texas

Description: It is the aim of this investigation to determine through routine checks if the bacterial count in the milk from Brooks Dairy Company is high and if so to determine the source. If it is found that the laboratory plate counts are unnecessarily high, it is the further purpose of this paper to make recommendations for improvements in the quality of milk produced by this dairy plant.
Date: 1949
Creator: Simonds, Thomas Hugh
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Qualitative Survey of the Airborne Algae, Protozoa, and Bacteria at the Denton Sewage Treatment Plant

Description: This study had a three-fold purpose. First, it was decided to determine if algae and protozoa were emitted to the air at the Denton sewage treatment plant. The information obtained could be of future importance in the fields of algal and protozoan ecology and public health. Second, it was decided to make a survey of the airborne bacteria at this plant. Some researchers have described bacterial air contamination at similar sewage treatment plants, but the one in Denton has not been studied. Thir… more
Date: May 1968
Creator: Mahoney, Joseph L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Assimilation of Inorganic Nitrogen by Aquatic Actinomycetes

Description: It was the purpose of this investigation to present laboratory data concerning the assimilation of inorganic nitrogen by the aquatic actinomycetes. The strains of aquatic actinomycetes under consideration represented a cross section of those currently under culture at North Texas State University.
Date: August 1962
Creator: Davis, Ernst M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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A Study of Selected Factors Related to Permanency in Science Teaching

Description: The purpose of this study is to gather information related to some factors which are considered to be characteristic of science teaching; to attempt to identify some elements of permanency in science teaching; and to analyze some relationships between the results of the above two criteria with the view of establishing some factors which may be useful as predictors of permanency, or indicative of patterns of permanency, in science teaching.
Date: August 1958
Creator: Lovelace, Allen J.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Actinoplanes Philippinensis: Effect of Carbon Sources on Zoospore Production

Description: Actinomycetes are able to utilize a great variety of carbohydrates, like sugar. The particular kind of sugar and its concentration has decisive effect on the growth of microorganisms. The proper nutritional media aids also in the production of spores. Based on this generalization, that the growth and sporulation of microorganisms are greatly influenced by the nature and the concentration of carbohydrates, an attempt has been made to study Actinoplanes philippinensis with respect to this influ… more
Date: May 1968
Creator: White, Olivia
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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A Quantitative and Qualitative Bacterial Analysis of Pecan Creek

Description: Since Pecan Creek receives sewage wastes from an obviously inadequate disposal system, it seemed possible that it could receive pathogenic bacteria. The fact that these might be present in numbers sufficient to cause epidemics, provided the proper natural vectors were present, stimulated an interest in and the pursuance of this study.
Date: 1946
Creator: Cook, Vernice
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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The Incidence of Escherichia Coli and other Coliform Organisms on Seventy-One Samples of Fresh Fruits and Vegetables Purchased from Eight Grocery Stores in Denton, Texas

Description: This investigation has for its aim the explanation of the incidence of colon bacteria on a number of food samples purchased in grocery stores of Denton, Texas, by an analysis of correlative sanitary factors.
Date: 1945
Creator: Scoggin, Frances Grammar
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Primary Productivity and Community Metabolism in a Small North Central Texas Pond Ecosystem

Description: Rates of primary production and community metabolism were monitored over a one year period using the diurnal oxygen method. Certain physico-chemical parameters were also measured, and autotrophic standing crops were estimated. An in-depth study was made of the phytoplankton community and various diversity indicies were calculated. Simple correlations were run between all parameters measured (biotic and abiotic), and their inter-relationships examined. Multiple linear regression analyses were us… more
Date: August 1975
Creator: Kelly, Martin H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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