Digital Commons Network^™

A Comparative Study Of A Salt Water Impoundment With Its Adjacent Tidal Creek Pertinent To Culture Of Crassostrea Virginica (Gmelin), William D. Anderson Iii

OES Theses and Dissertations

Certain physical, chemical and biological characteristics associated with the culture of subtidal Crassostrea virginica were assessed in a salt water impoundment and its adjacent tidal feeder creek. Large seed oysters (initial y = 57.3 mm) were transferred from a somewhat polluted estuary of Charleston Harbor to floating, mid-water, and bottom hardware cloth trays (200/tray) in a four hectare pond. Identical trays at comparable depths were placed in the tidal creek and each location was sampled monthly for growth and survival. Surface and bottom water samples were collected weekly throughout the study and hourly during four seasonal 25 hour stations. Standard …

Contribution Of The Electron Transport System To The Energetics Of Growth In Two Species Of Desulfovibrio, Burt D. Ensley

Biology ETDs

The growth of Desulfovibrio vulgaris and D. gigas on various electron donors and electron acceptors was measured in order to determine the influence of the donors and acceptors on energetics of growth. When using lactate, pyruvate, or formate as electron donors, and sulfate, sulfite, thiosulfate, or fumarate as electron acceptors, pyruvate-sulfate medium produced the most rapid growth, and intermediate levels of growth were observed on lactate­sulfate, with lowest levels on formate-sulfate. Both organisms grew best when sulfate was the electron acceptor regardless of electron donor. No growth occurred in cultures containing pyruvate and sulfite, and slight growth was observed in …

Cell-Mediated Cytotoxicity Of Jensen Tumor In Sprague-Dawley Rats, Theodore D. Masek

Loma Linda University Electronic Theses, Dissertations & Projects

An in vitro system for the study of the cell-mediated immune response to Jensen Sarcoma (JS) is described. The tumor grew unrestricted and lead to the demise of 80% of successfully challenged Sprague-Dawley rats (persistors) while 20% of challenged rats (regressors) destroyed the tumor by an unknown mechanism(s). Lymphocytes from both persistors and regressors were shown to be cytotoxic for tumor cells in vitro. Pretreatment of tumor target cells with "immune" serum from persistors or regressors had no effect on the in vitro cytotoxicity of lymphocytes from tumor-challenged rats. Pretreatment of lymphocytes with irmnune serum, however, was shown to reduce …

The Snowy Egret (Egretta Thula Brewsteri) A Life History Study At Utah Lake With Comments On The Subspecies Status, Gerald Leigh Gunnell

Theses and Dissertations

This study was conducted to augment the limited information available regarding the Snowy Egret in the Utah Lake area of Utah. Field observations included the following: nesting habits; egg and clutch sizes; sexual, defense, and feeding behaviors. Analysis was made of the distinguishing subspecies characteristics (culmen, tarsus, and wing length) of the Snowy Egrets and of the distribution of the birds. Field observations showed that growth measurements of the young varied from 16.75 g at hatching to 260.58 g after 17 days. Culmen and tarsus measurements were 15.41 mm and 14.12 mm to 53.18 mm and 62.18 mm, respectively, after …

Thermal Ecology And Movement In The Leopard Lizard, Gambelia Wislizeni, Baird And Girard, Marvin Lynn Abts

Dissertations and Theses

Thermal ecology and movement of the Leopard Lizard, G. wistizeniwere studied at Frog Spring, adjacent to the Alvord Desert, and at various locations throughout the Alvord Basin. Seasonal activity is known to occur from early May to mid-October, but abundance. gradually decreases after late July. During favorable late spring, and summer weather lizards exhibit a bimodal pattern of diel activity with some activity occurring at all hours of the day between 0600 and 1800 H. At other times activity was unimodal. Emergence was apparently largely temperature dependent and did not occur until sand temperature approximated 21°C. Retreat appeared to …

Defense Mechanism And Feeding Behavior Of Pteraster Tesselatus Ives (Echinodermata, Asteroidea), James Milton Nance

Theses and Dissertations

Pteraster tesselatus is noted for its external secretion of massive amounts of mucus. The mucus repels most animals, and fouls their respiratory physiology, if contact is maintained for any length of time. It provides protection essentially 100% of the time from Solaster dawsoni and Pycnopodia helianthoides, the only local stars that attempt to feed on Pteraster. The mucus, which is a simple mucopolysaccride, is produced in three different types of unicellular glands located in the epidermal tissues along the supradorsal membrane. Pores along the lateral walls of the ambulacral grooves provide fresh sea water for the dermal branchiae contained in …

Effects Of 2-Chloroethyl-Phosphonic Acid (Ethephon) As A Male Gametocide For Induction Of Sterility In Wheat And Barley, Jacqueline Taylor Martin

Doctoral Dissertations

Exploitation of induced male sterility has now become a potential tool in plant breeding. Ethephon (2-chloroethyl-phosphonic acid) has induced male sterility in winter cultivars of wheat and barley.

The purpose of this research was to further elucidate the response of winter wheat (Triticum aestivum L. em Thell), and winter barley (Hordeum vulgate L.) to foliar application of ethephon.

Ethephon was foliarly sprayed on winter cultivars of wheat and barley which were Arthur and Blueboy, and Barsoy and Volbar respectively, at 0.05, 0.10, and 0.20 and 0.40 percent active ingredient, when plants were in mid-boot and late boot stages in the …

Cortical And Subcortical Interhemispheric Interrelation In The Visual System, George C. Wagner

Masters Theses

No abstract provided.

The Modification By Temperature Of The Effects Of Mammalian Follicle Stimulating Hormone And 17b-Estradiol On The Process Of Vitellogenesis In The Lizard, Anolis Carolinensis, Susan Howard Early

Master's Theses

The effects of porcine follicle stimulating hormone, 17B-estradiol, and a combination of the two on the process of vitellogenesis were studied in Anolis carolinensis maintained at 15C with no light for one week, and then at 15C or 32C with 14 hours of light for two additional weeks.

At both temperatures, the control animals subjected to 14 hours of light possessed greater numbers of previtel­logenic follicles and lower liver weights than the control animals sacrificed after one week in the dark. Animals maintained at the higher temperature and given different hormonal treatments showed significant increases in ovary and oviduct weights, …

Seasonal Nearshore Distributions Of Fishes In A Piedmont Section Of The James River, Virginia, Eugene George Maurakis

Master's Theses

The seasonal nearshore distributions of 17 species of fishes were determined in natural and artificially heated areas in a 9.6 km stretch of the Piedmont section of the James River, Virginia from July, 1973 to June, 1974. Analyses of the seasonal distributions were based on abundance and percent frequency of occurrence data. The maximum abundance and percent occurrence of ten of the 17 species of fishes in natural temperature areas occurred in early autumn. Deviations from this pattern included Notropis analostanus, equally abundant throughout the year, and Lepisosteus osseus, Notropis amoenus, Notropis ardens, Notropis rubellus, Catostomus commersoni and Lepomis macrochirus, …

The Effects Of Prolonged Ultraviolet Irradiation On The Pigment System Of Pet/Wmr Mouse Epidermis, Penny Suzanne Nair

Master's Theses

Repeated exposure to ultraviolet radiation brings about an increase in the DOPA-positive melanocyte population of the human. However, there is an age-dependent decline in the melanocyte population regardless of UV irradiation. In the rhesus monkey, a drop in the DOPA-positive epidermal melanocyte population has been observed after prolonged UV irradiation. The population of DOPApositive epidermal melanocytes in PET/Wmr mice reaches a peak during the first post-natal week after which the number of cells declines, fading almost completely within 3 weeks. Their occurrence in adult mice is rare. With UV irradiation (300 nm) the melanocyte population of newborn and adult PET …

The Effect Of Photoperiod On The Regressive Phase Of The Ovarian Cycle Of The Lizard, Anolis Carolinensis., John Dickens Pinch

Master's Theses

The effects of constant photoperiod (14 hours of light) and decreasing photoperiod (13-8 hours of light) on the regressive phase of the ovarian cycle of the lizard Anolis carolinensis were investigated. Changes in body, liver, ovary and oviduct weights were measured and microscopic examinations of several ovarian parameters were made. In both light regimens body and liver weights decreased over the first four weeks of the experiment but both increased at the sixth week. In addition, ovary weight was highly variable but exhibited a decreasing trend and oviduct weight decreased. There were decreases in the number of previtellogonic follicles and …

Effect Of Recycling Cooking Liquor And Eliminating The Washing Stage During Chemical Deinking, Thomas H. Ollila

Paper Engineering Senior Theses

The purpose of this investigation was two-fold--first to determine what effects recycling the cooking liquor in varying percentages had upon the final pulp quality, and second to find out what effect eliminating the washing stage had upon the final pulp. The results are not as definite as would have been desired due to variation in the data. Generally, the results showed recycling the cooking liquor left more fines in the pulp resulting in higher tensile, burst, and fold strength. Eliminating the washing stage left more ink particles, pigments, and fines in the pulp which resulted in higher yields, better opacity, …

Lodging And Other Characteristics Of Seventy Corn Hybrids, Carl Andrew Ross

Masters Theses

In 1975, a lodging study was conducted on forty medium season and thirty full season corn hybrids at Knoxville and Crossville, Tennessee. Lodging and yields were determined at Knoxville and Crossville. Senescence over time, ear height, and number of days to silking and tasseling were determined at Knoxville.

Senescence, ear height and yield has little or no influence on lodging. Among all the factors evaluated, ear height, senescence, and number of days to silking and tasseling affected yields most in the medium season test. Ear height and number of days to silking and tasseling had the greatest effect on yields …

Effects Of Female Sex Hormones And Dietary Magnesium Levels In Sheep, Kenny S. Marbury

Masters Theses

The major objectives of this study were to evaluate (a) the effects of diet on magnesium, calcium and potassium metabolism in yearling wethers and (b) the effects of progesterone, estradiol and diethylstilbestrol (DES) on the metabolism of the minerals.

A two by two factorial design was selected whereby twelve yearling crossbred wether lambs were divided into four groups of three. One group was fed a basal diet plus magnesium along with hormones, one group was fed a basal diet plus magnesium without hormones, one group was fed a magnesium-deficient diet along with hormones, and one group was fed a magnesium-deficient …

Evergreen Tree Species For Urban Use In Eastern Tennessee, Vivian Orr Potter

Masters Theses

The objective of this study was to determine which of five tree species was best suited for urban conditions in eastern Tennessee with respect to certain criteria. The species included eastern white pine (Pinus strobus L.), eastern hemlock [Tsuga canadensis (L.) Carr.], Norway spruce [Picea abies (L.) Karst.], southern magnolia (Magnolia grandiflora L.), and eastern red-cedar (Juniperus virginiana L.). The criteria used for comparing the species were resistance to disease, resistance to insect pests, range of soil fertility adaptability, range of soil pH adaptability, and aesthetic appeal.

Questionnaires were sent to nurserymen …

Selected Characteristics Of High And Low Performance Rated Extension Agents Responsible For The Tennessee Agricultural Extension Special Program In Food For Youth, Beverly Daniels Kosoko

Masters Theses

The purposes of this study were to characterize High and Low performance rated Agents, to determine the relationship between performance rating level, attitude toward the assignment and other attributes of SPIFFY Agents in Tennessee. It was also proposed to identify selected aspects of the SPIFFY programs conducted by High and Low rated Agents.

The population of this study included all 37 SPIFFY Agents in the State of Tennessee. The data were collected by means of a mail questionnaire. A secondary source of data consisted in personnel records.

Results of the study indicated that level of performance was consequentially related to …

Relationships Between Bone Density And Dietary Intakes Of Energy And Protein In Older Female Vegetarians And Nonvegetarians, Mary Elizabeth Kunkel

Masters Theses

The purposes of this study were to compare differences in bone density, height, and weight among female vegetarians and nonvegetarians and to determine significant relationships between the physical measurements and dietary intake of calories and protein.

After obtaining informed consent, complete data were collected on 43 vegetarians and 36 nonvegetarians. Height, weight, and bone density measurements were taken. Dietary information was obtained from 7-day dietary records and diet histories. Dietary supplements were also recorded.

Daily intakes of calories, protein, and fat were calculated by computer using the food values in USDA Handbook No. 8. Percent of the total calories coming …

Consumer Acceptance And Evaluation Of Quality Attributes Of Beef Semimembranosus Roasts Heated At Three Oven Rates, Norma Pauline Ball

Masters Theses

Tenderness, an important quality attribute of meat, is affected by many factors including rate of heating. This quality attribute also has been reported as the single most important criterion for judging meat quality by the consumer. The purpose of this investigation was to evaluate selected quality attributes of beef semimembranosus roasts heated at three oven rates (93^oC, 149^oC, and a combination of 93^oC and 149^oC) using a consumer panel and instrumental measurements to determine whether tenderness is the most important meat quality attribute to the consumer and to study consumer habits and …

Effects Of Ethephon On The Pattern Of Flowering And Fruit Set Of Summer Squash, Carl Earnest Sams

Masters Theses

The plant growth regulator 2-chloroethylphosphonic acid (ethephon) was applied to summer squash to determine its effects on the flowering pattern. Treatments with all pistillate flowers pruned at anthesis, with and without ethephon applications were also compared to control plants to investigate the factors regulating flowering and fruit set of summer squash.

It was found that plants in the pruned treatments had a greater carbohydrate accumulation than plants in the nonpruned treatments, indicating that carbohydrate accumulation may be inversely associated with fruit development. Ethephon treatments produced more pistillate flowers per plant but also had a large number of aborted flowers. Thus, …

Induced Variability Of Resistance To Root-Knot Nematodes (Meloidogyne Incognita) In Soybeans (Glycine Max), Hendratno

Masters Theses

The purpose of this study was to determine the variability of resistance to root-knot nematodes (Meloidogyne incognita) in soybeans (Glycine max) induced by seed treatment with ethylmethane sulfonate (EMS).

Two soybean varieties, 'Essex' and 'Forrest,' were chosen as the experimental materials mainly on the basis of their distinct level of resistance; 'Essex' is susceptible and 'Forrest' is resistant. The M₂ and control populations were grown and tested for nematode resistance in the greenhouse. The number of gall developed on the roots was used to indicate the level of resistance.

The frequency distribution of the M …

Physiological Iron Deficiency Anemia In Suckling Beagle Pups, Timothy F. Porter

Masters Theses

No abstract provided.

Inhibition Of Gastric Secretion And Ulcer Formation By Lithium Chloride In The Rat, Thomas H. Adair

Masters Theses

No abstract provided.

Nutritional Efficiency Of Angus Cow-Calf Units, Dennis Owen Onks

Doctoral Dissertations

Angus cow-calf pairs were individually fed over a five-year period. Data from 62 mature cows and 114 calves were obtained. Cows varied in initial weight and production potential. Cows were fed grass silage, ad libitum, throughout gestation and lactation. Calves were fed a complete finishing and growing ration post weaning. Efficiency of cow-calf units was defined as the ratio of the yearly TDN intake of the cow plus the pre-and post weaning TDN intake of the calves. Second-order polynomials were fitted through the biweekly efficiency ratios for individual calves and solved to determine the most efficient point. This efficiency was …

A Study Of Ribosome Stability As A Function Of Ionic Conditions, Thomas G. Wood

Dissertations

No abstract provided.

Biota And Environment Of The Muskegon, Michigan, Combined Industrial And Municipal Wastewater Storage Lagoons, W. Randolph Frykberg

Dissertations

No abstract provided.

Partial Purification And Characterization Of Pectin Methyl Esterase In Southern Peas (Vigna Sinesis), Kun Kook Park

Masters Theses

The purposes of this study were to partially purify pectin methyl esterase (PME) of Southern peas (Vigna sinensis), to determine optimum pH and NaC1 concentration for maximum enzyme activity, to measure the energy of activation and kinetic reactions, and to ascertain the presence of multiple molecular forms of the enzyme and their isoelectric points.

PME was extracted from an acetone powder preparation and purified by a two-step ammonium sulfate fractionation and dialysis. The activity of the partially purified enzyme was significantly (p < 0.05) influenced by pH, NaC1 concentration, and the interaction between pH and NaC1 concentration. The optimum pH and NaC1 concentration were 7.9 and 0.25 M, respectively. The energies of activation were calculated to be 4,900, 5,950, and 6,900 calories/mole at pH 6.0, 7.0, and 7.0, respectively. PME had a K_m of 0.781% pectin N.F. and a V_max of 24.34 PME units.

Additional purification was …

Evaluation Of Anhydrous Ammonia As A Control Of Northern Pocket Gophers Thomomys Talpoides On Rangelands In The Wasatch Mountain, Utah, Marc C. Wride

Theses and Dissertations

Anhydrous ammonia (NH3) was tested as a potential replacement for residual, non specific toxicants as an effective control agent. It was postulated that NH3 would effectively control northern pocket gophers (Thomomys talpoides) and also act as a fertilizer for rangeland vegetation. Compound 1080 was selected as a standard for comparison of gopher control efficiency. Over 700 burrow systems were treated or monitored. Results showed compound 1080 to be 81 percent and NH3 45 percent efficient in controlling gophers. Although fertilizing effects of NH3 were positive, the low control efficiency and high application costs make NH3 an unlikely replacement for the …

The Cryptogamic Flora Of Desert Soil Crusts In Southern Utah, Davic C. Anderson

Theses and Dissertations

The cryptogamic flora of several soil crusts of arid regions in southern Utah was determined. Twenty-two lichens, Six mosses and fifty-four algal species were identified and their relative abundance estimated.

An Electrophysiological Analysis Of The Primary Input To The Cat Prepyriform Cortex, George Maeda

Loma Linda University Electronic Theses, Dissertations & Projects

Properties of the lateral olfactory tract (LOT) action potential and cortical evoked potential (EPSP) were studied using discrete stimuli applied to the tract in acute and chronic preparations. Stimulus response curves for both presynaptic (action) and postsynaptic (EPSP) potentials were sigmoidal and linearly related over the entire range. Simulated action potentials were used to determine the diameter to amplitude relationship, an intermediate step for finding the threshold as a function of tract axon diameter. Our results indicate that threshold is proportional to (diameter) ^-3.4 instead of (diameter) ^-1 as found by others in frog peripheral nerve. Further work is required …