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  Partner: UNT Libraries
 Degree Discipline: Biology
 Collection: UNT Theses and Dissertations
Studies on the Morphology and Biology of Cotton Rats (Sigmodon hispidus) from Northern Mexico to Southern Nebraska

Studies on the Morphology and Biology of Cotton Rats (Sigmodon hispidus) from Northern Mexico to Southern Nebraska

Date: December 1971
Creator: Cleveland, Arthur Gordon
Description: This investigation was designed to evaluate the need for retaining both Sigmodon hispidus texianus and Sigmodon hispidus berlandieri as subspecific designations. An attempt was made to demonstrate bioclimatic variation and reproductive seasonality in cotton rats. The validity of applying the results of isolated studies of cotton rat populations to the species as a whole was examined.
Contributing Partner: UNT Libraries
Phosphatides of Atypical Mycobacteria

Phosphatides of Atypical Mycobacteria

Date: May 1968
Creator: Hollingsworth, Russell C.
Description: The purpose of this investigation was to extract, separate, partially characterize and compare the individual phospholipids of the atypical mycobacteria.
Contributing Partner: UNT Libraries
Heat Resistance in Vegetative Cells and Cysts of Azotobacter

Heat Resistance in Vegetative Cells and Cysts of Azotobacter

Date: August 1969
Creator: Rosenthal, Raoul S.
Description: The purpose of the current study is to determine something of the nature of the heat resistance in Azotobacter, if in fact this is found to exist. An attempt is made to determine the specific physiological state associated with heat resistance as well as to resolve this resistance quantitatively.
Contributing Partner: UNT Libraries
Isolation, Purification, and Characterization of Aldolase from Human Heart

Isolation, Purification, and Characterization of Aldolase from Human Heart

Date: August 1972
Creator: Allen, Benja L.
Description: Aldolase from human heart has been purified 128-fold to a final specific activity of 11.52 units per mg. The purification procedure employed column chromatography on phosphocellulose.
Contributing Partner: UNT Libraries
Observations on the Life History of the Brown Spider, Loxosceles Reclusa Gertsch and Muliak

Observations on the Life History of the Brown Spider, Loxosceles Reclusa Gertsch and Muliak

Date: August 1967
Creator: Horner, Norman
Description: This research was undertaken primarily to further elucidate the life history of this medically important spider. Special attention was given to rearing experimental spiders under as near-natural environmental conditions as possible.
Contributing Partner: UNT Libraries
Pleomorphism in Selected Genera of Algae

Pleomorphism in Selected Genera of Algae

Date: June 1967
Creator: Bruton, Barbara A.
Description: It is the purpose of this study to ascertain what environmental factors might cause morphological changes exhibited by certain algae, also to determine if this variation in morphology is vegetative, reproductive, or artifactual in nature, and to show what effects these changes in morpohology might have on classification of the organisms in question.
Contributing Partner: UNT Libraries
Some Effects of X-Irradiaion on the Adrenal Response to Hypothalamic Stimulation in Rats

Some Effects of X-Irradiaion on the Adrenal Response to Hypothalamic Stimulation in Rats

Date: January 1967
Creator: Agnew, Robert Laing
Description: Exactly where in the hypothalamus is the adrenal-pituitary response to X-irradiation "triggered" or initiated? Moreover, does ionizing radiation act directly on specific centers in the brain or does it act indirectly via the production of some humoral agents? Finally, what role does the hypothalamus play in the radiation-syndrome? The purpose of the present study was to attempt to answer these questions by determining the effects of two stressor agents, X-irradiation and electrical stimulation applied either singly or together, on the activity of the adrenal-pituitary axis. The parameters measured were changes in plasma corticosterone, in circulating eosinopihils, and in adrenal gland weight.
Contributing Partner: UNT Libraries
Serological Characteristics of Morphologically and Biochemically Similar Streptomyces Species

Serological Characteristics of Morphologically and Biochemically Similar Streptomyces Species

Date: August 1969
Creator: Kocsis, Imre J.
Description: It is the purpose of this investigation to test for serological characteristics of six Streptomyces species which exhibit identical and/or very closely similar morphological and biochemical characteristics.
Contributing Partner: UNT Libraries
The Production of Fragile Cysts by an Aberrant Strain of Azotobacter Chroococcum Isolated from Soil

The Production of Fragile Cysts by an Aberrant Strain of Azotobacter Chroococcum Isolated from Soil

Date: May 1969
Creator: Cagle, Gerald D.
Description: The purpose of this study is to determine if a strain of Azotobacter chroococcum isolated from the soil in northern Louisiana produces cysts which are as resistant to deleterious agents as those produced by previously reported strains os Azotobacter.
Contributing Partner: UNT Libraries
A Screening of Fungi for Metabolites Inhibitory to the Growth of Bloom-Forming Blue-Green Algae

A Screening of Fungi for Metabolites Inhibitory to the Growth of Bloom-Forming Blue-Green Algae

Date: December 1970
Creator: Hardcastle, Ronald V.
Description: Since many approaches to dealing with algal blooms are inefficient, expensive, or harmful, it was concluded that a biologically-synthesized chemical agent, specifically inhibitory to pre-bloom algal cells, might prove helpful in controlling algal blooms. Fungi were chosen as the biological entities to investigate for such a chemical.
Contributing Partner: UNT Libraries
Photoreactivation Studies on Azotobacter vinelandii ATCC 12837

Photoreactivation Studies on Azotobacter vinelandii ATCC 12837

Date: August 1968
Creator: Peterson, Johnny Wayne
Description: This thesis was written to study photoreactivation in different physiological conditions of the vegetative cell as well as the photoreactivation of the two morphological states of the Azotobacter cell: the vegetative cell and the cyst.
Contributing Partner: UNT Libraries
The Autecology of Celtis Laevigata in Flood Plain Forests of Denton County, Texas

The Autecology of Celtis Laevigata in Flood Plain Forests of Denton County, Texas

Date: January 1970
Creator: Hander, Lecil B.
Description: This thesis describes the present nature of one facet of some of the flood plain forest stands in Denton County, Texas. The specific purpose was to demonstrate the presence or absence of difference between the Celtis laevigata (commonly known as the hackberry, southern hackberry or sugarberry) populations in stands on Denton Creek and Elm Fork of the Trinity River.
Contributing Partner: UNT Libraries
A Study of Malate Dehydrogenase Isoenzymes in the Midge Larva Glyptotendipes barbipes

A Study of Malate Dehydrogenase Isoenzymes in the Midge Larva Glyptotendipes barbipes

Date: May 1972
Creator: Jones, Vicki E.
Description: Two isoenzymes of malate dehydrogenase were isolated and partially purified from the midge larva Glyptotendipes barbipes. Differential centrifugation followed by cellulose acetate and polyacrylamide gel electrophoresis revealed one isoenzyme associated with the mitochondrial fraction and another form found only in the cytoplasm.
Contributing Partner: UNT Libraries
Some Acute Effects of X-Irradiation (LD100) on Plasma and Adrenal Tissue Histamine in Rats

Some Acute Effects of X-Irradiation (LD100) on Plasma and Adrenal Tissue Histamine in Rats

Date: May 1972
Creator: Ferguson, James L.
Description: The effects of a lethal dose (1380 r) of X-irradiation on plasma and adrenal tissue histamine levels of rats were studied. The plasma histamine response was triphasic (increase at 1-3 hours, decrease at 5 and 9 hours and return to control at 24 hours post-irradiation). The adrenal tissue histamine response was found to be biphasic (decrease at 1 to 9 hours and a return to control level at 24 hours post-irradiation).
Contributing Partner: UNT Libraries
Actinoplanes Philippinensis: Effect of Carbon Sources on Zoospore Production

Actinoplanes Philippinensis: Effect of Carbon Sources on Zoospore Production

Date: May 1968
Creator: White, Olivia
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 influence.
Contributing Partner: UNT Libraries
Ultrastructural Changes of Tumor Implants in Mice

Ultrastructural Changes of Tumor Implants in Mice

Date: January 1970
Creator: Abrams, Joe A.
Description: The purpose of this investigation was to observe the sequential ultrastructural changes in tumor implants of a well established tumor line in isologous mice.
Contributing Partner: UNT Libraries
Factors Affecting Slime Formation in a Spray Irrigation Waste Disposal System

Factors Affecting Slime Formation in a Spray Irrigation Waste Disposal System

Date: August 1970
Creator: Jorgensen, James H.
Description: It was the purpose of this investigation to determine (1) what organisms are associated with the formation of this slime layer, (2) if certain chemical factors in the environment either enhance or retard formation of the slime layer, (3) whether or not there are certain chemical factors which are detrimental to slime formation, yet not detrimental to purification, or that perhaps enhance purification, (4) whether or not there are chemical factors which enhance purification of the effluent without preventing slime formation, and (5) what effects the chemical treatments have on the microbial flora of the soil system.
Contributing Partner: UNT Libraries
A Study of a Branchiobdellid from Denton County, Texas

A Study of a Branchiobdellid from Denton County, Texas

Date: May 1970
Creator: Koepp, Stephen J.
Description: In this study, branchiobdellids were collected from crayfish captured from two adjacent sites in Denton County, Texas. Identification of the branchiobdellid, Cambarincola vitrea Ellis, was first made and then work was extended to include several topics of ecological interest.
Contributing Partner: UNT Libraries
Purification and Characterization of Ascaris Suum Aldolase : An Initial Phylogenetic Study of Aldolases

Purification and Characterization of Ascaris Suum Aldolase : An Initial Phylogenetic Study of Aldolases

Date: August 1972
Creator: Dedman, John R., 1947-
Description: An efficient purification procedure of Ascaris suum muscle utilizing ion exchange column chromatography has been developed.
Contributing Partner: UNT Libraries
Nitrogen Accretion on a Lacustrine Plain

Nitrogen Accretion on a Lacustrine Plain

Date: May 1972
Creator: Davis, Karla S.
Description: The purpose of the investigation was to locate the plant population which had the greatest impact on soil nitrogen in a successional sequence from newly deposited alluvia to a mature streamside forest, and to evaluate the pioneer populations in terms of their annual nitrogen contribution.
Contributing Partner: UNT Libraries
Obligately Thermophilic Nitrogen-Fixation in Some Soil Bacteria

Obligately Thermophilic Nitrogen-Fixation in Some Soil Bacteria

Date: August 1971
Creator: Milam, Mary
Description: In the work presented here, it is claimed that bacteria have been isolated which are capable of growth at high temperatures utilizing molecular nitrogen as their sole nitrogen source. Soil bacteria were isolated which grew at 55 C in nitrogen-free media. They were found to be obligatory thermophiles in nitrogen-free media and facultative thermophiles in media containing organically bound nitrogen.
Contributing Partner: UNT Libraries
The Larval Lipids of the Chironomid Midge Glyptotendipes Barbipes (Staeger)

The Larval Lipids of the Chironomid Midge Glyptotendipes Barbipes (Staeger)

Date: December 1971
Creator: Talent, John M.
Description: This problem was concerned with determining the total lipid content and individual lipid composition of the larvae of a local chironomid, Glyptotendipes barbipes (Staeger).
Contributing Partner: UNT Libraries
The Biological Elimination of Phenols in the Effluent of a Wood Preserving Plant

The Biological Elimination of Phenols in the Effluent of a Wood Preserving Plant

Date: August 1971
Creator: Rainey, John G.
Description: The removal of phenols from the waste waters of wood preserving plants has always presented problems. The purpose of this paper is to investigate the possibility of employing a biological system to reduce the phenol content of effluent from these plants.
Contributing Partner: UNT Libraries
Effects of High Altitude Exposure on Capillary Permeability

Effects of High Altitude Exposure on Capillary Permeability

Date: December 1971
Creator: Reaves, Troy Albert
Description: Observations of decreases in plasma volume, shifts in plasma and lymph protein concentrations, and increases in capillary permeability at high altitude have been reported in the literature by several investigators. This investigation was begun in an attempt to elucidate the possible significance of these phenomena in future space exploration, and because of the lack of knowledge concerning the underlying mechanisms. The purpose of this investigation was to determine the effects of exposure to hypobaric pressures on the capillary permeability to the normal plasma and lymph proteins.
Contributing Partner: UNT Libraries