Digital Commons Network^™

Leaf Litter Processing In Aquatic Systems Two Variable Model, Boyd Jay Hanson

Theses and Dissertations

The adequacy of the negative exponential model with one independent variable, days or accumulated time, as a descriptive equation for aquatic leaf litter processing was examined. The effect of adding a second independent variable, degree days or accumulated temperature, to the model was also examined. The two variable negative exponential model was shown to have at least two advantages over the single variable model. The two variable model adequately fits litter processing data for more cases than the single variable model. The expanded model also allows determination of rate coefficients for various temperature levels of the experiment rather than assuming …

The Accumulation And Metabolism Of Triphenyltin Hydroxide (Du-Ter) In Crayfish (Procambarus Clarkii) In A Model Ecosystem, John Gary Hollingshaus

Theses and Dissertations

Triphenyltin hydroxide (TPTH) appears to be relatively stable in soil. Only minor partitioning into water occurred because of the insolubility of TPTH in water and its adsorption to soil. Residues in the water were also relatively stable. The concentration. of TPTH in the tissues of crayfish exposed to 1.0 ppm of TPTH in the soil was 0.1 ppm or 10% that of the environment. Crayfish exposed to 0.01 ppm of TPTH in the soil had 0.005 ppm TPTH in their tissues or 50% that of the environment. Greater than 80% of the residue in the muscle tissue appeared to be …

The Relationship Of Social And Maturational Variables To Development Of Field-Dependence In Preschoolers: A Longitudinal Study, Elizabeth S. Baraga

Theses and Dissertations

This study was an initial attempt to relate theoretically and empirically three heretofore independent developmental concepts— differentiation, attachment and competence. Borrowing from Mahler's thesis of separation-individuation, differentiation is thought to be a process which begins when the child separates himself from mother. It is hypothesized that differentiation begins at about six months within the context of a mother-child symbiotic relationship.

Once the infant has formed initial body boundaries he is then capable of forming a specific bond to his primary caretaker. This mother-child bonding has been labelled attachment by other theorists and is hypothesized to occur at about 9 months. …

Discrimination Learning Sets In Children, Sandra Harrell Fenner

Theses and Dissertations

This study investigated the relationship between the formation of discrimination learning set and children's ability to use logical thinking as indicated by verbalization of the rule of the problem. Twenty-seven seven-year-olds and 27 nine-year-olds, all females, within the average IQ range, were presented four-trial object discrimination problems as a game. Each child was presented 20 problems per day for one to three days until she reached the criterion of two successive problems in which no error was made on trials 2, 3, and 4 of both problems. After every ten problems the experimenter asked the subject questions to determine whether …

The Role Of North Dakota Health Council In State Government, Terry Brosseau

Theses and Dissertations

No abstract provided.

The Plant Communities Of Arches National Park, John Stevens Allan

Theses and Dissertations

Arches National Park, located in southeastern Utah, lies in a transition zone between the southwestern hot desert and the western cold desert, but it is floristically most similar to the hot desert. The major plant communities are as follows: Juniper-pinyon, blackbrush, grasslands and sand dune association. Other community types occur but occupy very limited areas. All of the communities studied have a high degree of uniqueness and merit recognition as separate entities. Blackbrush showed the greatest overall similarity to other communities and was most similar to the sand dune communities. The hanging gardens were the most distinctive and covered the …

Self-Concept In Children Of Alcoholics, David J. Baraga

Theses and Dissertations

The progressive deterioration of an alcohol abuser is well documented. As the alcoholic continues to sink into a deeper dependency on alcohol, he experiences devastating physical and emotional repercussions. Not the least of the repercussions is the gradual breakdown of his family system. As the alcoholic moves toward the bottle, his family moves away from him, with the result that alcoholism ranks as one of the leading causes of broken homes. Alcoholism is double-edged; it affects not only the primary victim but it exerts a heavy toll on the spouse and children as well. Only recently has stress in research …

High Pressure Liquid Chromatographic Methods For The Separations Of Derivatized Alpha-Keto Acids And Thiamine Phosphate Esters, Bruce Clark Hemming

Theses and Dissertations

Improved methods have been developed for separation of a-keto acid derivatives and for thiamine and its phosphate esters. Linear gradient reverse phase chromatography using ion-pair formation provides baseline resolution for a seven-component homologous series of a-keto acid dinitrophenylhydrazones having increasing carbon chain lengths. Branched-chain keto acids can also be separated. Aldehyde derivatives were examined as possible interfering compounds. Peak identification in biological material was confirmed for pyruvate by an enzymic peak shift technique. Monitoring near 365 nm permits low nanogram detection. Preliminary studies of keto acids in biological material illustrate the method's applicability. The same system with slight changes separates …

Plant Dioecy, Ecology, Evolution And Sex Reversal, D. Carl Freeman

Theses and Dissertations

The distribution of dioecious species among forty-four plant communities of western United States was examined. The dioecious habit is most prevalent in harsh environments. In many communities, over 20 percent of the species and 40 percent of the individuals are dioecious. Dioecy is most common among woody species which are pollinated by wind. It is concluded that inbreeding depression alone is insufficient to account for all known facts concerning dioecy. Disruptive selection acting upon differential success of gametes produced on sites of differing quality appears to have played a major role in producing separate sexed individuals. Dioecious species reported to …

The Mammals Of Zion National Park With Emphasis On Ecology And Distribution Of Twelve Species Of Rodents, Paul A. Gardner

Theses and Dissertations

Information concerning the mammals of Zion National Park was needed for management purposes and general information. During the summers of 1975 and 1976, mammals observed throughout the park were recorded and habitat structure was measured for each animal at the immediate observation site. Ordinations based on stepwise discriminant analyses of the data on 12 rodent species were constructed and substantiated by Bray-Curtis analyses. The results showed that amounts of cover and boulders contrasted the habitats of Peromyscus eremicus, P. maniculatus, P. crinitus, P. boylii and P. truei. A second group of species--Eutamias minimus, E. umbrinus, Spermophilus variegatus, Tamiasciurus hudsonicus, Dipodomys …

Behavior And Age Class Structure Of Wintering Northern Bald Eagles (Haliaeetus Leucocephalus Alascanus) In Western Utah, Ronald A. Joseph

Theses and Dissertations

Bald Eagles in Cedar and Rush Valleys of western Utah were studied from 1975 to 1977. Arriving in mid-November, the eagles departed in mid-March. A statewide Bald Eagle census revealed 200 to 300 birds. Wintering eagle populations have remained stable for the past 10 years. Immatures comprised 35% of the population in 1975-76 and 33% in 1976-77. While Black-tailed jackrabbits are the primary food source of wintering eagles in western Utah, other mammalian carrion serve as supplementary food items. Eagles utilized 4 communal night roosts. Three day communal roosts were located on south facing slopes. The social existence of Bald …

Executive Compensation In The United States, James Clements

Theses and Dissertations

No abstract provided.

The Relationship Of Reduced Levels Of Atp To Inhibited Chondrogenesis In The Production Of Limb Deformity Induced By 6-Aminonicotinamide, Val C. Sheffield

Theses and Dissertations

6-aminonicotinamide (6-AN), an analogue and antagonist of nicotinamide, impairs cartilage formation and results in shortening of the limb when administered to chick embryos. 6-AN forms an abnormal NAD analogue (6-ANAD), which inhibits the activity of NAD-dependent enzymes associated with the production of ATP. The mechanism of action of 6-AN was studied by measuring the biosynthesis of protein and DNA, and the sulfation and glycosylation of chondroitin sulfate in control and 6-AN treated cartilage from 8-day chick embryos. The cartilage was also assayed for ATP levels. Incorporation of Na235SO4 was inhibited by 6 h treatment with 10 μg/ml 6-AN, whereas 3H-thymidine …

The Genus Haemolaelaps (Acarina: Laelapidae) In The Northwest Ethiopian Biogeographical Region, Calvin J. Sakamoto

Theses and Dissertations

This paper presents the results of a taxonomic stury of mites of the genus Haemolaelaps collected from small mammals of 8 political subdivisions of the northwest portion of the Ethiopian Biogeographical Region. Specimens taken from 2,863 small mammals from a wide variety of habitats and localities were examined. The Haemolaelaps fauna includes 23 species, 10 of which are described as new: H. bellasoma, H. caurinus, H. chaetospinicus, H. crocidura, H. desmodilliscus, He. ebsi, H. malachela, H. parahirsti, H. sikapusi and H. taterakempi. Numerical taxonomic and multicariate analyses were used to assess variation and clustering. A key for identification of females …

The Transvestitie Female Shakespearean Phenomenon: Charlotte Cushman's Romeo And Sar Bernhardt's Hamlet, Ellen Boyer

Theses and Dissertations

The purpose of this study is to investigate the transvestite female Shakespearean phenomenon of the theatre, determining why actresses chose to portray male Shakespearean heroes and how they were able to achieve notable levels of success in transvestite Shakespearean endeavors.

The initial stage of my study presents an historical overview of transvestite acting in the theatre and the relevant events leading up to the emergence of the first transvestite female Shakespearean actresses. This preliminary stage of my research relies primarily on George C.D. Dell's Annals of The New York Stage, Charles H. Shattuck's Shakespeare on the American Stage, theatre reviews …

An Exploratory Study Of Male Primary Teachers: Their Perceptions Of Professional Status And Potential For Increasing Their Number, Byron L. Meek

Theses and Dissertations

Procedure: The problem of this study was to identify and describe the perceptions male primary school teachers hold about themselves and their profession. Through this, the professional status and potential for increasing the number of male primary teachers was determined.

Procedure: The research population consisted of the. twenty male primary teachers in the public school systems of Minneapolis and St. Paul, Minnesota. The data for this study was obtained through in-depth personal interviews which were based on an original questionnaire designed for the specific purpose of this study. A summary of responses given to each question was followed by an …

The Differentiation Of Mercury Species In Submicrogram Quantities In Aqueous Solution, David A. Hildebrand

Theses and Dissertations

Although trace analysis procedures for the analysis of total mercury have been available for a number of years, a major shortcoming of the procedures has been the inability to differentiate between the exact chemical forms of mercury species in solution. This is needed due to the varlng toxicity of the different species. An investigation was made of the possible analytical procedures which could be used for a separation and quantitation of mercury (0), mercury(I), mercury(II), methyl- and phenylmercury(II). The method of flameless atomic absorption spectroscopy (PAA) was used to detect mercury vapor produced by reduction of all mercury species or …

Vice And Violence In Ward County, North Dakota: 1905-1920, Michael J. Martin

Theses and Dissertations

This thesis is the examination of Ward County as a violent and lawless county between the years of 1905 and 1920. A general history of the county prior to 1905 is presented along with a description of the major economic activities with in the county during this period of study.

A breakdown of the jurisdiction of the three courts located in the county is accomplished by using North Dakota legislative materials which originally gave them the jurisdiction The type of offense and the number of offenses tried in the three courts, along with a general review of the categories of …

Antonio Callado's Reflections Of The Ball And Some Reflections On Its Translation, Harriet S. Mcclelland

Theses and Dissertations

This thesis consists of a translation of Antonio Callado's Reflections of the Ball (Rio de Janeiro: Paz e Terra, 1976) from Portuguese to English, an analysis of some of the problems involved in the translation process with proposed solutions to the specific problems of this work, and a critical analysis of some of the literary aspects of the book.

The following procedure was followed: (1) a first draft translation was made, and a native speaker of Brazilian Portuguese was consulted to see if the meaning was retained in the target language at all points; (2) then, the translation was gone …

Pinnated Grouse (Tympanuchus Cupido Pinnatus) Movements And Habitat Utilization In The Northern Great Plains, Jeffrey P. Jorgenson

Theses and Dissertations

This paper discusses habitat availability and utilization and population changes of pinnat ?d grouse in the northern great plains. Three aspects of grouse ecology were examined in Grand Forks County, North Dakota, and Polk County, Minnesota, during March 197^ to March 1976: (1) habitat types of specific management units and the surrounding area, (2) past and present population levels and distribution within the study areas, and (3) spring home ranges, habitat utilization, and dispersal from the booming ground by males.

Two cover types, Cropland (75-8 percent) and Grass (20.9 percent), were abundant on the Grand Forks County study area. Cropland …

Accumulation And Metabolism Of Triphenyltin Hydroxide (Du-Ter) In Channel Catfish, Hal B. Jenson

Theses and Dissertations

The fate of ring-14C labeled triphenyltin hydroxide was studied in a model ecosystem consisting of soiI, water, and channel catfish (Ictalurus punctatus). Two initial levels of triphenyltin hydroxide concentration in soiI, 1.0 and 0.010 ppm, were compared. The soiI showed a gradual loss of 20 to 30% of the total 14C residues. Only about 33% of the remaining soil residues could be extracted and almost all of these were triphenyltin hydroxide. Total residues in the water were very low. Catfish muscle and viscera accumulated 14C residues continually throughout the treatment portion of the experiment. When the catfish were transferred to …

Partitioning Of Space And Time By The Western Jumping Mouse, Zapus Princeps Utahensis Hall, John M. Deacon

Theses and Dissertations

Intraspecific competition is important in determining habitat utilization by members of a single species. Effective use of habitat may involve partitioning the available resources: space, time and food among individuals of different age, sex, and/or reproductive state. Numerous publications deal with interspecific competition (McCloskey and Fieldwick 1975, Cody 1973, Rosenzweig 1973, Stewart and Levin 1973, Gaby 1972, Brown 1971, Koshkina 1971, Sheppe 1967, Caldwell and Gentry 1965, Cameron 1964, Clough 1964, Gause 1932), but little has been written on intraspecific competition among populations of organisms in nature.

Isolation, Purification, Scanning Electron Microscopy And Bacterial Dna Uptake Of Plant Protoplasts, Bronwyn G. Hughes

Theses and Dissertations

Protoplasts were isolated from tobacco and barley leaves in sucrose or mannitol using commercially available cellulases and macerozymes. Barley growth and protoplast isolation and purification conditions were optimized so that protoplasts were obtained in high yields free of unwanted debris and organelles. A technique for processing barley and tobacco protoplasts for examination by scanning electron microscopy was developed in which protoplasts seem to have maintained their structural integrity. Barley and tobacco protoplasts took up 3H-B. subtilis DNA, 125I-B. subtilis DNA or 125I-M. luteus DNA as a linear function of time (0-6 hr) and DNA concentration (0-200 μg/ml). Up to 16 …

Cytosol Binding Of Steroid Hormones In Sheep Brains And Pituitaries, David Carl Marcusen

Theses and Dissertations

The uptake and binding of tritiated cortisol, corticosterone, and dexamethasone in cytosols isolated from various regions of non-adrenalectomized (intact) and adrenalectomized sheep brains and pituitaries were studied. [3H]-cortisol and [3H]-corticosterone were bound preferentially by cytosols from the hippocampal and septal regions of the brain, whereas, [3H]-dexamethasone was preferentially bound by cytosol from the pituitary. Cytosols isolated from the brains of adrenalectomized sheep bound significantly more [3H]-corticosterone than did cytosol from the brains of intact animals. Pre-incubation of cytosols from the hippocampus of adrenalectomized animals with non-radioactive testosterone or estradiol did not significantly block the subsequent binding of [3H]-cortisol. Results of …

Utilization Of Nest Boxes By Birds In Three Vegetational Communities With Special Reference To The American Kestrel (Falco Sparverius), Laurence Barrett Mcarthur

Theses and Dissertations

This study was designed to determine if, by providing artificial nest sites, a raptorial predator could be attracted into an area where suitable sites are limited. The American Kestrel (Falco sparverius) was a common species in the area and nest boxes designed for their use were placed in three vegetational types in western Utah and eastern Nevada. Seventy boxes were available in 1975 and 110 in 1976. Kestrels nested both years in the salt-desert shrub community but were absent from the pinyon-juniper and riparian areas. Four other bird species nested in the latter two areas, however. In 1975 the nesting …

Certain Edaphic And Biotic Factors Affecting Vegetation In The Shadscale Community Of The Kaiparowits Area, Vane Orlan Campbell

Theses and Dissertations

A study area on the southern extensions of the Great Basin cold desert (Kaiparowits Basin, Utah) was selected which has had varying amounts of disturbance. Areas with similar slope and exposure in the Shadscale community were sampled. At each site, soil samples were collected and percent sand, percent clay, percent silt, soluble salts, and hydrogen ion concentrations were measured. Cluster analysis based on percent frequency of the perennial species showed that eight groups or sub-communities were definable within the area sampled. Patterns within the vegetation were shown to be independent with the use of cluster analysis. Discriminant analysis on soil …

Gender Role Of Male Pseudohermaphrodites In The Dominican Republic, Sara V. Mallea

Theses and Dissertations

This study introduces factors in the post-pubertal change of gender role in a group of male pseudohermaphrodites in the Dominican Republic. The individuals grow up as girls because of ambiguous genitalia at birth. Upon the onset of puberty, with development of scrotum and phallus, they generally select adult male models to emulate as their future role behavior. The essay describes the socio-cultural setting in which the children are raised and proposes a theory that differential socialization of boys and girls and adult access to resources are contributing elements in the decisions to switch gender roles. At the time of the …

An Analysis Of Neuromuscular Function At Hyperbaric Pressures., George Richard Athey

Theses and Dissertations

No abstract provided.

The Effect Of He-O₂ Hyperbaria Upon Aspirin-Induced Gastro-Intestinal Bleeding, Harley A. Pakola

Theses and Dissertations

No abstract provided.

The Role Of The Sympathetic Blockade In The Alteration Of Lung Protein And Cholesterol In A Hyperbaric-Hyperoxic Environment, Stephen R. Muza

Theses and Dissertations

No abstract provided.