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O-Demethylating Enzyme System Of Clostridium Thermoaceticum / By Zhongren Wu, Zhongren Wu Jan 1988

O-Demethylating Enzyme System Of Clostridium Thermoaceticum / By Zhongren Wu, Zhongren Wu

Electronic Theses and Dissertations

No abstract provided.

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The Effect Of Grass Carp Introduction On Aquatic Vegetation And Existing Fish Populations In Two Small Prairie Lakes, David L. Bauer Jan 1988

The Effect Of Grass Carp Introduction On Aquatic Vegetation And Existing Fish Populations In Two Small Prairie Lakes, David L. Bauer

Electronic Theses and Dissertations

Within two years after triploid grass carp introduction in 2.3 hectare Prior Lake in South Dakota, aquatic vegetation coverage and height in the water column were significantly lower (P<0.005). During the same two year period, triploid grass carp did not significantly reduce aquatic vegetation coverage or height in the water column in 11.4 hectare East Lake Eureka, also in South Dakota. Stocking densities were 49 fish/hectare and 61 fish/hectare (229 mm mean total length) in Prior Lake and East Lake Eureka, respectively. The biomass of prey fish in East Lake Eureka in 1986 was quite high with 88.3, 85.3 and 17.3 kg/hectare for black bullhead (Ictalurus melas), yellow perch (Perea flavescens), and bluegill (Lepomis macrochirus), respectively. The biomass of northern pike (Esox lucius) was also high at 13.8 kg/hectare. A Proportional Stock Density (PSD) of 11 and Relative Weight (WK) of 117 indicated a relatively healthy bluegill population in East Lake Eureka. However, the PSD value for black bullheads was lower (8) while their condition was relatively good (K=l.58). The yellow perch population appeared to be over-populated in East Lake Eureka with a PSD of only 5 and a relatively low condition factor (K=l.14). The northern pike population in East Lake Eureka had a PSD value of 53, but a slightly low Wr of 94. Available prey/predator ratio indicated that there was an excess of prey fish for most size classes of predators. Because no significant vegetation reduction occurred in East Lake Eureka, no changes in existing fish populations could be attributed to grass carp introduction or aquatic vegetation reduction. Data gathered on existing fish populations in East Lake Eureka will serve as a pre-treatment data set to be compared to future conditions if aquatic vegetation is reduced. Fish sampling in Prior Lake was greatly reduced due to a winterkill which occurred in the late winter of 1986. Bluegill and largemouth bass (Micropterus salmoides) were the most abundant fish species found in Prior Lake in 1987. Bluegill appeared to be overpopulated as their PSD value was 1; a high Wr of 109 may have indicated improved conditions immediately following the winterkill. Results for the largemouth bass in Prior Lake were similar with a low PSD (7) and a high w~ (112). Winterkill (Prior Lake) and lack of aquatic vegetation control by grass carp (East Lake Eureka) prohibited making conclusions about the effect of grass carp introduction on the existing fish populations in the two lakes. Further research needs to be conducted in South Dakota to determine appropriate grass carp stocking rates for South Dakota waters, and to evaluate what effect grass carp introduction and aquatic vegetation reduction has on existing fish populations.

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Electrophoretic, Morphometric, And Meristic Comparisons Of Walleye Broodstock In South Dakota, Chantel M. Waltner Jan 1988

Electrophoretic, Morphometric, And Meristic Comparisons Of Walleye Broodstock In South Dakota, Chantel M. Waltner

Electronic Theses and Dissertations

Electrophoretic and morphological variability among walleyes collected from three upper Missouri River tributaries and a glacial lake in South Dakota was investigated, and an upper Mississippi River stock was electrophoretically compared to the South Dakota stocks. Allele frequencies of two (MDH-3, GMP-3) of the twenty-one loci examined differed significantly (P<0. 05) between South Dakota and Mississippi River walleyes. Contingency chi-square tests of allele frequencies showed homogeneity among walleyes from the Missouri River tributaries, and significant (P<0.001) heterogeneity (P<0.001) at the GMP-3 locus between Missouri River and glacial lake stocks. A dendogram derived from Nei unbiased genetic identity values produced separate branchings for the South Dakota and Mississippi River walleyes. All four walleye stocks in South Dakota were morphologically variable, although no one character could be used as a diagnostic tool to separate the stocks visually. Discriminant function analysis of eight of the most powerful discriminatory characters was successful in correctly classifying walleyes by origin with 83-97% accuracy.

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Growth, Survival, And Vulnerability To Predation Of Stocked Walleye (Stizostedion Vitreum) Fingerlings, James D. Wolters Jan 1988

Growth, Survival, And Vulnerability To Predation Of Stocked Walleye (Stizostedion Vitreum) Fingerlings, James D. Wolters

Electronic Theses and Dissertations

In laboratory tanks, largemouth bass (Micropterus salmoides) and northern pike (Esox Lucius consumed fathead minnows (Pimephales promelas) 2.6 times more frequently than walleye (Stizostedion vitreum) and 5.7 times more than lepomids. Prey were more vulnerable in circular than rectangular tanks. In field studies, walleye fingerlings averaging 35 mm and 53 mm (mean total length) were stocked in two ponds (3- and 7- hectares) respectively: both contained largemouth bass, northern pike, yellow perch (Perca flavescenes), green sunfish (Lepomis cyanellus), and fathead minnows. Aquatic insects dominated the diet of largemouth bass for 3 days after walleye were stocked, indicating that walleye fingerlings …

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Waterfowl Production On Three Types Of Artificial Nesting Structures In South Dakota Wetlands, Marcy Haworth Jan 1988

Waterfowl Production On Three Types Of Artificial Nesting Structures In South Dakota Wetlands, Marcy Haworth

Electronic Theses and Dissertations

Artificial nesting structures are currently being used by various agencies to offset the decline in waterfowl production due to predation losses and degradation of nesting habitats. However, the various structure types available are not equally attractive to nesting waterfowl. This study looked at 3 types of artificial nesting structures – open topped cone baskets, round hay bales, and concrete culverts – and evaluated their used, success, and production in South Dakota. Structure type and site characteristics were correlated to occupancy rates and nesting success. Sixty-eight baskets and 205 bales were monitored during 1986, and 154 baskets, 200 bales, and 20 …

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Forage Potential Of Seasonal Wetlands, Daniel Edward Hubbard Jan 1988

Forage Potential Of Seasonal Wetlands, Daniel Edward Hubbard

Electronic Theses and Dissertations

Investigations on aspects of seasonal wetland forage potential were conducted in eastern South Dakota. The quantity and quality of the standing crop of vegetation in 6 seasonal wetland communities were assessed at the end of the growing season in 1983 and in 2 seasonal-wetland-dominated basins and their associated uplands (native mixed-grass prairie) over the growing season in 1985. Crude protein (CP), ash, detergent fiber, and in vitro digestible dry matter (IVDDM) values were measured on the above-ground material of whitetop [Scolochloas festucacea (Willd.) Link], slough sedge (Carex atherodes Spreng.), burred (Spargnaium eurycarpum Engelm.), and smartweed (Polygonum amphibium L. var. emersum …

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Productivity, Movements, And Habitat Use Of Nesting And Brooding Wild Turkey Hens In Gregory County, South Dakota, Keith Stephen Day Jan 1988

Productivity, Movements, And Habitat Use Of Nesting And Brooding Wild Turkey Hens In Gregory County, South Dakota, Keith Stephen Day

Electronic Theses and Dissertations

Radio-equipped wild turkey (Meleagris gallopavo) hens (n=53) were monitored in a prairie river breaks environment in south-central South Dakota during 1986 and 1987. Seventy percent (36 of 47 adults and 1 of 6 juveniles) of the monitored hens nested. Hens that nested prior to 7 May selected nest sites in woodland habitats, while hens nesting later than 7 May selected nest sites in grassland habitats. Hens nested at sites with higher (P<0.05) percent visual obstruction, percent shrub cover, presence of overhanging vegetation, and habitat diversity than found at random control sites. Nest sites also allowed greater field of vision and opportunities for escape than random controls. Discriminant models developed from variables measured at nest and control sites were effective in distinguishing between the 2 categories. Seventeen of 39 (43.6%) clutches hatched, and 11 broods survived to mid-August. Poult survival in 1986 was 42.9%, with all poult mortality occurring during the first 2 weeks post-hatch. Accurate data for poult survival was not obtainable during 1987, but survival appeared to be similar to 1986. Broods moved up to 3.5 km from nest sites before establishing definite ranges. Broods ranges were composed of ≥50% woodland types, while woodlands comprised only 30.8% of the study area. Mean range size increased 3-fold from the 0-4 week age class (Age 1) to the 4+ week age class (Age 2). Broods used habitats in proportion to availability within ranges. However, grasslands were used more than expected (P<0.05) between 0631 hr and 1130 hr over the summer, and less than expected (P<0.05) by Age 2 broods between 1131 hr and 1630 hr. Woodlands were used more than expected between 1131 hr and 1630 hr over the summer, but not significantly so. Seventy-seven percent of all brood sightings made between 0631 hr and 1130 hr, and 67% of all sightings made between 1631 hr and 2030 hr were in grassland habitats. Seventy-two percent of all brood sightings made between 1131 hr and 1630 hr were in woodlands. Grassland brood use sites had greater forb cover, less grass cover, and were closer to habitat edges than random control sites (P<0.05). Discriminant analysis effectively reclassified grassland brood use sites, but not control sites. Age 1 broods sued grassland sites with greater overhead (> 30 cm) shrub cover, and nearer habitat edges than sites used by Age 2 broods (P<0.05). Woodland brood use sites were nearer (P<0.05) habitat edges than random controls. No significant differences could be found between woodland sites used by Age 1 and Age 2 broods. Discriminant analysis was ineffective in distinguishing between classes for woodland brood use sites or between ages for either woodland or grassland brood use sites.

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Lactational Evaluation Of Recombinant Bovine Somatotropin With Corn And Barley Diets, Wade Arthur Eisenbeisz Jan 1988

Lactational Evaluation Of Recombinant Bovine Somatotropin With Corn And Barley Diets, Wade Arthur Eisenbeisz

Electronic Theses and Dissertations

Forty-eight Holstein cows were randomly assigned wk 3 postpartum to a corn or barley diet from wk 4 through 44 postpartum. Cows within diets at wk 14 were randomly assigned to receive 0 (control), 10.3, 20.6, and 30.9 mg/hd/d of recombinant bovine somatotropin injected wk 15 through 44 postpartum. Forage dry matter was 80% corn silage and 20% alfalfa hay. Forage to concentrate ratio in total mixed diets varied from 50:50 to 70:30 with milk production. For the entire lactation, milk production of (29.7 and 29.1 kg/d) and 4% FCM (27.3 and ·25.9 kg/d) was lower for cows fed barley …

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Characteristics Of Milk And Butter From Cows Fed Sunflower Seeds, Robert Paul Middaugh Jan 1988

Characteristics Of Milk And Butter From Cows Fed Sunflower Seeds, Robert Paul Middaugh

Electronic Theses and Dissertations

Composition of milk and butter was evaluated from cows fed either control, or experimental diets containing added added fat of partially unsaturated fatty acid composition. The control diet concentrate mix consisted mainly of corn and soybean meal. The two experimental diets substituted either 20% high oleic acid sunflower seeds () 79% of fatty acids as oleic acid) or 20% regular sunflower seeds () 67% of fatty acids as linoleic acid) for part of the corn and soybean meal in the concentrate -mix. Milk protein concentration was similar for the control (3.3%) and high oleic sunflower seeds (3.3%), but increased in …

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Forced Vibrations Of Hollow Cylindrical Structures, Douglas Jose Nunez Briceno Jan 1988

Forced Vibrations Of Hollow Cylindrical Structures, Douglas Jose Nunez Briceno

Electronic Theses and Dissertations

Whereas the pioneers of vibration investigations sought the understanding of the natural phenomena and the derivation of mathematical models to better describe the vibration of physical systems, the researchers in this century have strived to apply the knowledge gained in the past to make new discoveries, so that vibration analysis can be applied to practical engineering problems. Hence, today's engineers have become aware of the fact that many engineering systems are subjected to vibrations either because of external excitations (forced vibrations) or because of the system's ability to store energy as a result of its elastic properties (free vibrations). Being …

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Effects Of Dietary Crude Protein And Fiber On The Digestibility Of Diets For The Young Weaned Pig, Barton S. Borg Jan 1988

Effects Of Dietary Crude Protein And Fiber On The Digestibility Of Diets For The Young Weaned Pig, Barton S. Borg

Electronic Theses and Dissertations

Three experiments were conducted using a total of 30 young weaned pigs, surgically fitted with simple T-cannula at the terminal ileum, to evaluate the effects of dietary crude protein (CP) and fiber on the ileal and fecal digestibilities of various dietary fractions. Pigs (avg wt, 7.9 kg) were rotated through a series of diets in crossover designs. Experiment 1 addressed the effect of 12.2, 17.2 and 20.8% dietary CP on ileal and fecal digestibilities of dietary dry matter (DM), nitrogen, amino acids, neutral detergent fiber (NDF), acid detergent fiber, crude fiber, cellulose, hemicellulose lignin and ash. With increasing dietary CP …

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Evaluation Of Groundwater Monitoring Data At The Madison Infiltration-Percolation Wastewater System, Byung-Chun Choi Jan 1988

Evaluation Of Groundwater Monitoring Data At The Madison Infiltration-Percolation Wastewater System, Byung-Chun Choi

Electronic Theses and Dissertations

The first community in South Dakota to construct and operate an infiltration-percolation (1/P) system was the City of Madison. The present wastewater facility consists pretreatment (aerated grit chamber), primary clarification (circular clarifier), aeration basin (oxidation ditch), final clarification (circular clarifier), 27-acre storage basin, infiltration basins, and anaerobic digestion. Construction of the 1/P system took place during 1983. The system consists of 4 cell, each 3.6 acres. The site was stripped and leveled, 12 inches of topsoil were laid back over the exposed gravel areas, and dikes capable of containing 5 feet of liquid depth were constructed. A new lift station …

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Iris Murdoch's "Learning Protagonists" : Toward Contingency, Responsibility And Reality, Patrice J. Coleman Jan 1988

Iris Murdoch's "Learning Protagonists" : Toward Contingency, Responsibility And Reality, Patrice J. Coleman

Electronic Theses and Dissertations

For over thirty years Iris Murdoch has continuously provided entertaining and thought-provoking novels. This prolific Irish-born English novelist has also sparked contention and controversy. She is accused of overtly manipulating her characters, placing them in extreme and implausible situations, sacrificing the realism which she admires and espouses. The world of literary criticism remains divided regarding their evaluation of Murdoch's intentions and achievements. While some steadfastly deny her a place among writers of the first rank, others proclaim her the greatest author writing in England today. Because she was born in Dublin and raised and educated in. London, both Ireland and …

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The Development And Initial Public Relations Efforts Of The Tyrone Guthrie Theatre, Sandra K. Cudmore Jan 1988

The Development And Initial Public Relations Efforts Of The Tyrone Guthrie Theatre, Sandra K. Cudmore

Electronic Theses and Dissertations

In New York City theatrical creativity and opportunities were being stifled by economic pressure. Over-crowding, over-cautious producers and over-priced productions were destroying theatre as it had been recognized for the past two decades. Sir Tyrone Guthrie and his staff began searching for an ideal city for a repertory theatre. They believed a repertory theatre could be an outlet or an expansion of New York theatre which would help the theatrical situation of the country. They found the location in Minneapolis/St. Paul, Minnesota. The year 1988 marks the twenty-fifth anniversary of the Tyrone Guthrie Theatre. It is an opportune time to …

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Response Of Oat To Chloride Fertilization, Paul E. Gaspar Jan 1988

Response Of Oat To Chloride Fertilization, Paul E. Gaspar

Electronic Theses and Dissertations

Several studies conducted in South Dakota have shown significant yield increases in wheat and barley due to chloride (Cl) fertilization. The effects of Cl on oat were evaluated in the greenhouse and two field experiments. Five cultivars and 3 KC1 fertilizer levels (0, 58, and 117 Kg ha-1) were tested in a factorial arrangement. In a second experiment, five N fertilizer levels (0, 34, 68, 102, 136 kg ha-1) and 2 KC1 fertilizer levels (0 and 135 kg ha-1) on oat (Benson) were tested in a factorial arrangement. The greenhouse study had 4 levels of Cl (0, 10, 20, and …

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A Comparison Of Three Sit-Up Exercises For Improving Abdominal Strength And Endurance, Brent L. Dunford Jan 1988

A Comparison Of Three Sit-Up Exercises For Improving Abdominal Strength And Endurance, Brent L. Dunford

Electronic Theses and Dissertations

Yessis claims that a sit-up which will bring greater muscle development to the entire abdominal wall ls the bench sit-up. In this sit-up, the abdominal muscles are responsible for flexion of the lower spine and involves the movement of the upper body toward the lower body. To perform the bench sit-up, the person sits crosswise on a bench with the pelvic girdle well supported and the feet on the floor. With the feet supported and the arms across the chest, the individual slowly leans backward until the trunk is slightly below horizontal, creating a slight hyperextension of the spine. The …

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Quantitative Genetic Analysis Of Stalk Quality Characteristics In A Corn Synthetic, Maria Magdalena Held Jan 1988

Quantitative Genetic Analysis Of Stalk Quality Characteristics In A Corn Synthetic, Maria Magdalena Held

Electronic Theses and Dissertations

Considerable progress has been made in improving the standability of corn (tea mays L.). Further improvement of stalk lodging resistance is still necessary because of increased plant populations and fertilizer inputs. Also, with increased yields and rising drying costs, late season stalk strength will become even more important in the future. Stalk rots are the most important diseases of corn in the U.S. corn belt and associated lodging leads to losses in yield and quality. The most economical way to minimize losses is to improve stalk lodging resistance. However, lodging is subject to substantial genotype x environment interaction. Stalk quality …

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Learning Needs Of Ostomy Patients: A Comparison Of Nurse And Patient Perceptions, Linda K. Burdette Jan 1988

Learning Needs Of Ostomy Patients: A Comparison Of Nurse And Patient Perceptions, Linda K. Burdette

Electronic Theses and Dissertations

The study will attempt to identify areas of agreement and disagreement between the ostomy patient's perception and the nurse's perception of learning needs. In order to achieve this purpose, the objectives of the study were:
,1. Determine the different perceptions regarding the importance of content items offered in an ostomy patient education program when comparing:
a. Medical-surgical nurses and ostomy patients;
b. E.T. nurses and ostomy patients;
c. Medical-surgical nurses and E.T. nurses.
2. Determine the different perceptions regarding time placement of patient education content items when comparing:
a. Medical-surgical nurses and ostomy patients;
b. E.T. nurses and ostomy patients; …

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Impact Of Perceived Mandatory Continued Formal Education On Professional Attitudes Of Licensed Practical Nurse Associate Degree Upward Mobility Students, Kathy Hankel Jan 1988

Impact Of Perceived Mandatory Continued Formal Education On Professional Attitudes Of Licensed Practical Nurse Associate Degree Upward Mobility Students, Kathy Hankel

Electronic Theses and Dissertations

This study examines the effects of perceived mandatory continued education on professional attitudes of Licensed Practical Nurse Associate Degree Upward Mobility Students. The results indicate a statistically significant difference in the professional attitude of self-regulation. Those Licensed Practical Nurse Associate Degree Upward Mobility Students who perceived continued education as mandatory had a more positive attitude regarding self-regulation than those who chose to continue their education. Age and size of city were variables that also influenced professional attitudes.

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Perceptions Of Health Status Of Rural Elderly, Colleen Miller Jan 1988

Perceptions Of Health Status Of Rural Elderly, Colleen Miller

Electronic Theses and Dissertations

Questionnaires were designed and administered to a nonrandom sample of 18 rural elderly residents in a midwestern state. The questionnaires obtained information which attempted to describe perceptions of current health status and self-care capability, to determine the relationship between perceptions of health status and type of residence or senior citizen center attendance. The dependent variables were definitions of perceived health status as derived from the Health Perceptions Questionnaire. Health status included factors of current health, prior health, health outlook, resistance to illness, health worry/concern and sickness orientation. The independent variables were selected personal factors, self-care capability, desire for self-care and …

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Control Of Yellow Foxtail Postharvest In Small Grain, Reed Eugene Froseth Jan 1988

Control Of Yellow Foxtail Postharvest In Small Grain, Reed Eugene Froseth

Electronic Theses and Dissertations

This research was conducted to determine: a) if the control of yellow foxtail Setaria lutescens by mechanical or chemical means post-harvest in small grain would affect the weed infestation potential of the subsequent crop, b) whether or not tillage influenced corn yield, C0 the effect of carrier volume and addition of ammonium sulfate on the above herbicides, and d0 the relative toxicities of the above herbicides for control of yellow foxtail.

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Structural Differentiation, Technology, And Employee Fringe Benefits : A Model Of Formal Organization, Paul Eric Krueger Jan 1988

Structural Differentiation, Technology, And Employee Fringe Benefits : A Model Of Formal Organization, Paul Eric Krueger

Electronic Theses and Dissertations

This study investigated the extent to which the structural differentiation and the technology of private industry organizations were related to employee fringe benefits in South Dakota. This was accomplished through the development and testing of a theoretical framework and model which represented the modification and synthesis of Max Weber's theory of bureaucracy and Peter Blau's theory of structural differentiation. Using a mailed questionnaire, data were obtained on measures of structural differentiation, technology, and employee fringe benefits from a sample of the population of all private industry organizations in South Dakota which had 10 or more employees. The measurement of unionization …

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The Effect Of Participating In A Fitness And Lifetime Skills Program On Attitude Toward Physical Activity, Paul C. Konrad Jan 1988

The Effect Of Participating In A Fitness And Lifetime Skills Program On Attitude Toward Physical Activity, Paul C. Konrad

Electronic Theses and Dissertations

The purpose of this investigation was to determine if student attitude toward physical activity changed following exposure to one semester of fitness and lifetime skills instruction. The study specifically examined attitude difference and change by gender and class level for 343 college aged males and females. Subjects for the study were selected via a stratified random sample of courses offered within the Physical Education 100 Fitness and Lifetime Skills Program. Attitude measurements were obtained utilizing Kenyon's multi-dimensional Attitude Toward Physical Activity and Body Image Inventory administered in a test-retest procedure. A two-way analysis of variance (ANOVA) revealed significant pretest differences …

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A Profile Of Rosebud Sioux Indians Involved In A Diabetes Education Intervention Program, Mary L. Kramlich Jan 1988

A Profile Of Rosebud Sioux Indians Involved In A Diabetes Education Intervention Program, Mary L. Kramlich

Electronic Theses and Dissertations

A convenience sample of 91 Rosebud Sioux diabetics involved in the Rosebud Diabetes Education Program were interviewed while attending diabetes clinics. Information was collected concerning diabetics' health attitudes, knowledge of diabetes, compliance to prescribed diabetic therapy, weight, height, fasting blood sugar (FBS), and blood pressure. A profile developed of the Rosebud diabetics revealed that 88 percent were considered obese, with Body Mass Index (BMI) values ≥26 kg/m. Approximately 43 percent of the subjects had acceptable FBS levels of i180 mg/dl. Average questionnaire scores of the diabetics were 44 percent for positive health attitudes, 71 percent for diabetes knowledge and 63 …

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Investigation Of The Causes Of Observed Translations In A Series Of Abutments Of Concrete Box Girder Bridges, Craig Richard Lenning Jan 1988

Investigation Of The Causes Of Observed Translations In A Series Of Abutments Of Concrete Box Girder Bridges, Craig Richard Lenning

Electronic Theses and Dissertations

In 1980, at the request of the South Dakota Department of Transportation (SDDOT), a study was undertaken to determine the probable cause of a specific type of cracking that was observed in a series of concrete box girder bridges. The study, "Investigation of the Cause of Observed Cracks in a Series of Concrete Box Girder Bridges", was conducted by Dr. Arden B. Sigl and Steven M. Bjordahll. In addition to the cracking, the end abutments had shifted in a translatory mode toward the girders. The abutments were analyzed to determine if the abutment movements_ observed could be expected for the …

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Expression Of Leptospira Biflexa Serovar Patoc Antigens In Escherichia Coli Ja221, Joann Willgohs Mogard Jan 1988

Expression Of Leptospira Biflexa Serovar Patoc Antigens In Escherichia Coli Ja221, Joann Willgohs Mogard

Electronic Theses and Dissertations

The genus Leptospira belongs to the order Spirochaetales and the family Leptospiraceae. Currently, there are two Leptospira species: L. interrogans, which includes the pathogenic or parasitic organisms; and L. biflexa, all of which are saphrophytic, free-living leptospires. Approximately 240 different serovars, the final taxonomic subdivision of these organisms, have been reported based on antigenic analysis via microscopic agglutination and cross-agglutination absorption tests. These serovars are categorized into serogroups (approximately 60) due to antigenic cross-reactivity. In addition to antigenic analysis, a number of biological and biochemical tests are used to distinguish the two species including: growth at low temperatures, sensitivity to …

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Analysis Of The Herbicides Chlorsulfuron, Sulfometuron Methyl And Metsulfuron Methyl In Soil And Water, Fei-Wen Mao Jan 1988

Analysis Of The Herbicides Chlorsulfuron, Sulfometuron Methyl And Metsulfuron Methyl In Soil And Water, Fei-Wen Mao

Electronic Theses and Dissertations

Chlorsulfuron, sulfometuron methyl and metsulfuron methyl are new herbicides. They are effective in controlling weeds in different areas. Generally, they are applied at very low levels. Their decomposition rates vary with soil moisture, pH, etc. Since they may be used year after year and their decomposition rates are not very rapid in this climate, the persistence can be a problem with herbicide carryover harming crops in the following years. Therefore, there is a need for a method to measure very low levels of these herbicides in soil and water to ensure that the quantities which might be present are not …

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Growth Of Campylobacter Jejuni In Autoclaved And Irradiated Media, Todd Richard Mcaloon Jan 1988

Growth Of Campylobacter Jejuni In Autoclaved And Irradiated Media, Todd Richard Mcaloon

Electronic Theses and Dissertations

Campylobacters are found in the reproductive organs, intestinal tract and oral cavity of man and animals. The organism was first isolated over 75 years ago and Campylobacter jejuni is now recognized as a pathogen of increasing importance, occasionally causing fatal acute and subacute gastrointestinal illness in humans. From 1973 to 1981, C. jejuni was isolated as frequently as Salmonellae and over three times as often as Shigellae from patients with diarrhea. The number of isolations of C. jejuni from feces of patients with diarrhea increases yearly and the number of cases reported are believed to be an underestimation of the …

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Comparison Of Immunologic Responses Between Mice Differing At The Agouti Locus : Immunologic Abnormalities In Lethal Yellow (Ay) Mice Are Augmented By Obesity, Nancee L. Oien Jan 1988

Comparison Of Immunologic Responses Between Mice Differing At The Agouti Locus : Immunologic Abnormalities In Lethal Yellow (Ay) Mice Are Augmented By Obesity, Nancee L. Oien

Electronic Theses and Dissertations

The agouti locus, located on chromosome 2 of the house mouse (mus musclus), functions in the complex regulation of pigment synthesis. The complexity of its regulatory role is revealed through the aberrations that become manifest when a mutation, specifically the lethal yellow (AY) mutation, occurs at the agouti locus. The lethal yellow mutation is associated with an alteration in pigment synthesis, onset of obesity at approximately 120 days, and an increased susceptibility to cancer. Based on the putative relationship between cancer and immunity, this mutation may be correlated with altered immune mechanisms. This correlation was investigated by comparing a delayed-type …

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South Dakota Elevator's Winter Wheat Marketing Practices And Seasonality Of Cash Wheat Prices, Boyd Milton Ober Jan 1988

South Dakota Elevator's Winter Wheat Marketing Practices And Seasonality Of Cash Wheat Prices, Boyd Milton Ober

Electronic Theses and Dissertations

South Dakota is among 12 states which consistently produce both spring and winter wheat. Since 1983, South Dakota and two other states have produced approximately equal amounts of spring and winter wheat. Historically, South Dakota has predominantly produced spring wheat. From 1977 through 1982 spring wheat production in South Dakota averaged 48.4 million bushels per year. Winter wheat production during the same period averaged 22.4 million bushels. However, since 1983 South Dakota winter wheat production has been slightly larger than spring wheat production. Increased acreage was the major reason for the increase in winter wheat production. South Dakota acreage used …

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