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Articles 1 - 30 of 88
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A Polyperiod Analysis Of Profit Maximizing Strategies With Beef Cow Herds Under Variable Weather Conditions In North Central South Dakota, David H. Jibben
A Polyperiod Analysis Of Profit Maximizing Strategies With Beef Cow Herds Under Variable Weather Conditions In North Central South Dakota, David H. Jibben
Electronic Theses and Dissertations
This study used three polyperiod linear programming models to analyze the effects of several management strategies on the organization of a hypothetical 2,560 acre ranch in North Central South Dakota. Two models including three-year drought periods and one model with no drought were constructed. In building the two drought models, several assumptions concerning drought assistance to cattle producers were made and incorporated into the models. The major findings of the study were as follows: 1. A land use program using 620 acres of cropland and 1,800 acres of pasture land resulted in greater total profit than a land use program …
The Columnar Junipers Of Western North Dakota (An Investigation Into The Cause Of Their Columnarity), James M. Murphy
The Columnar Junipers Of Western North Dakota (An Investigation Into The Cause Of Their Columnarity), James M. Murphy
Electronic Theses and Dissertations
The objective of this report is to focus on the evaluation of the presence and amount of ethylene in the burning lignite fumes and to search for morphogenetic factors in the lignite at the Slope County site. The former was considered to be more important and was investigated more thoroughly.
The Cost Of Transporting Grain By Truck In South Dakota With Special Reference To Proposed Rail Line Abandonment, Kenneth W. Keehn
The Cost Of Transporting Grain By Truck In South Dakota With Special Reference To Proposed Rail Line Abandonment, Kenneth W. Keehn
Electronic Theses and Dissertations
The objectives of this thesis are: 1. Estimate the cost equations of transporting grain by farm truck and semi-trailer truck in South Dakota, 2. Estimate the cost of transporting grain by farm truck in the Watertown to Doland and Watertown to Stratford branch line market areas, and 3. Use the results of objectives 1 and 2 to evaluate various alternatives if branch line abandonment occurs in the above market areas. The alternatives to be studied are: a. Trucking grain to the nearest elevator without rail service and receiving less for grain, b. Trucking grain to the nearest elevator with rail …
Nucleophilic Substitution At Phosphorus In Six-Membered Ring Phosphate Esters, Mike Bauman
Nucleophilic Substitution At Phosphorus In Six-Membered Ring Phosphate Esters, Mike Bauman
Electronic Theses and Dissertations
From these results the following conclusions may be drawn: 1. The stereochemistry of nucleophilic substitution at phosphorus is influenced by the basicity of the leaving group with the more basic leaving group favoring retention. 2. Lithium ion diverts the reaction to retention by forming an intimate ion-pair with the nucleophile which then attacks phosphorus. This associated ion is less reactive than the unassociated nucleophile. 3. For the retention mechanism the leaving group participates in the rate determining step. 4. The mechanism for retention entails a more sterically unfavorable configuration than for inversion.
Listeria Monocytogenes In The Environment Of Livestock In South Dakota, James W. Neiles
Listeria Monocytogenes In The Environment Of Livestock In South Dakota, James W. Neiles
Electronic Theses and Dissertations
The purpose of this investigation is to study the incidence of Listeria monocytogenes in the environment of livestock in South Dakota. The data accumulated from these studies will provide information as to its natural habitat, mode of transmission and factors responsible for its incidence.
Bearing Capacity Of Eccentrically Loaded Surface Footings On A Sand Layer Resting On A Rough Rigid Base, Roland Dale Maynard
Bearing Capacity Of Eccentrically Loaded Surface Footings On A Sand Layer Resting On A Rough Rigid Base, Roland Dale Maynard
Electronic Theses and Dissertations
The purpose of this investigation is to present the results of some recent laboratory model testing of the ultimate load carrying capacity of eccentrically loaded strip, surface footings on sand, with a rigid base located at varying depths. It is expected that these results will. lend to a better quantatative [sic] understanding of the problems encountered in these situations.
Methods Of Analysis Of Yield From Antecedent Winter Water, Charles Gregg Carlson
Methods Of Analysis Of Yield From Antecedent Winter Water, Charles Gregg Carlson
Electronic Theses and Dissertations
This investigation is an evaluation of methods of analysis of water conserved during off-season periods and evaluation of the effect on the subsequent crop. Energy and water shortages during the midsummer peak irrigation season have forced farmers to consider the possibility of irrigation at times other than peak growth stages as an alternative practice. Dryland farmers are interested in the benefit of water conserving cultural practices such as summer fallow and snow trapping. To evaluate the benefit of these off-season practices, a yield function based upon water availability is necessary. In order to better understand the effects of off-season irrigation …
Effects Of Ay On Preimplantation Embryo Lethalities (Ay/Ay) And On Abnormal Mating Behavior (Ay/A) In Strain C57bl/6j Mice, Kevin Thomas Brock
Effects Of Ay On Preimplantation Embryo Lethalities (Ay/Ay) And On Abnormal Mating Behavior (Ay/A) In Strain C57bl/6j Mice, Kevin Thomas Brock
Electronic Theses and Dissertations
The immediate objectives of the studies to be presented were (1) to establish the presence and characterize the morphology of the Ay/Ay homozygotes before and after implantation, (2) describe the relationship between embryo and uterus, (3) characterize prenatal and neonatal losses occurring to the Ay/a mouse, and (4) test the randomness of mating selection of the Ay/a mouse. To meet the objectives, data collected from the complete serial section of embryos in utero at 90 and 132 hours post coitum (hpc) from matings of yellow females (Ay/a) by yellow males (A …
Ground Water Quality Variation At A Rapid Infiltration Land Treatment System Used For Tertiary Wastewater Treatment, Thomas W. Drake
Ground Water Quality Variation At A Rapid Infiltration Land Treatment System Used For Tertiary Wastewater Treatment, Thomas W. Drake
Electronic Theses and Dissertations
Based on the need to monitor nitrates because of the 1977 modifications, as well as upon the original EPA provisions for ground water monitoring, the studies reported in this thesis were initiated. The objectives of this investigation were as follows: 1. To monitor four wells within the influence of the rapid infiltration pilot units, as well as two control wells located beyond the influence of the units, to determine any substantial changes in ground water quality, which might be attributed to the rapid infiltration pilot unit operation; 2. To specifically examine the nitrogen data collected from the perforated drains in …
The Effect Of Potassium Permanganate On The Removal Of Iron And Manganese From Ground Water, Mohammad Reza Farvardin
The Effect Of Potassium Permanganate On The Removal Of Iron And Manganese From Ground Water, Mohammad Reza Farvardin
Electronic Theses and Dissertations
For the past three years or so, a gradual migration of iron and manganese deposits has been observed in the water mains to the west of the East Water Treatment Plant of Brookings, South Dakota. These deposits have been gradually migrating further westward from the plant (8). Routine analyses of the treated water from the East Plant indicate that the iron and manganese levels are within the USPHS recommended limits (9). Consequently, conclusive evidence that this plant is the source of the problem does not exist. However, the analyses are normally conducted on samples collected shortly before backwashing the filters. …
Specificity Of Antisera Against Hordeum Vulgare Ribonuclease And Serological Quantitation Of The Enzyme In Tissue Extracts, Steven Bryan Hawthorne
Specificity Of Antisera Against Hordeum Vulgare Ribonuclease And Serological Quantitation Of The Enzyme In Tissue Extracts, Steven Bryan Hawthorne
Electronic Theses and Dissertations
Specific rabbit antisera against purified seedling RNase I from both a hardy (Dicktoo) and less-hardy (Tennessee Winter) cultivar of winter barley was obtained using a 1 mg injection schedule. Both antisera formed a single precipitin band on double immunodiffusion and immunoelectrophoresis when reacted with the homologous crude tissue extract. RNase antigen from either cultivar was highly cross-reactive with both antisera. Passive hemagglutination inhibition was used in an attempt to distinguish purified RNase from both cultivars. A consistent difference in anti-RNase serum specificity between cultivars was shown, but the difference observed by this method was not sufficient to conclude structural differences …
First Year Corn Damage - Northern Corn Rootworm Ovipositional Studies, Thomas W. Hedrick
First Year Corn Damage - Northern Corn Rootworm Ovipositional Studies, Thomas W. Hedrick
Electronic Theses and Dissertations
The purpose of this study was to determine the factors involved in first year corn damage by corn rootworm beetles and to sample small grain stubble for adult dispersion and oviposition.
A Study Of Residential Water Demand In And Around The Big Sioux River Basin, Jeffrey Platek
A Study Of Residential Water Demand In And Around The Big Sioux River Basin, Jeffrey Platek
Electronic Theses and Dissertations
The objectives of this study were to: (1) derive a demand function for residential water use for spring and summer quarters which would be representative of the average household within the Big Sioux River Basin and adjacent areas. The function was based on variables for price, number of persons per household, average annual income per capita, and average monthly rainfall; (2) determine significant variables which affect residential water consumption; and (3) derive price and income elasticities which will show the response in water consumption to changes in the price of water and per capita income.
Cell Surface Changes During Early Mouse Development, James Thomas Rector
Cell Surface Changes During Early Mouse Development, James Thomas Rector
Electronic Theses and Dissertations
Objectives of this thesis were to further characterize cell surface properties of preimplantation mouse embryos. A study was conducted to determine latent effects of varying pulses of CB on early postimplantation mouse embryos by comparing their abilities to hatch, to attach and to sustain growth and differentiation of ICM and trophoblast tissue. CB treatment was begun at the 8-cell stage. Objectives of the studies involving Con A were to determine (1 ) whether agglutinability with Con A changes during compaction of 8-cell embryos, (2) if changes in numbers of binding sites parallel changes in agglutinability during preimplantation development, (3) whether …
Treatment Capabilities Of A Rapid Infiltration Pilot Unit Treating Stabilization Pond Effluent, Richard G. Seas
Treatment Capabilities Of A Rapid Infiltration Pilot Unit Treating Stabilization Pond Effluent, Richard G. Seas
Electronic Theses and Dissertations
In October, 1972, Congress passed PL 92-500, "Federal Water Pollution Control Act Amendments of 1972 1; which is designed to upgrade the quality of the nation's water. The act requires the formulation of effluent standards that would require use of “best practicable treatment”. The effluent standards are to require use of the "best available" technology by July 1, 1983 (1). PL 92-500 requires the Environmental Protection Agency Administrator to publish information explaining which treatment techniques may be used to meet the requirement of "best practicable treatment". Land application of wastewater has been designated as a viable alternative to traditional treatment …
Observations On Attachment And Spreading Of Zonaless Tw32/Tw32 (Brachyury Locus) And Control Icr Preimplantation Mouse Embryos, Ker Hwa Tung
Observations On Attachment And Spreading Of Zonaless Tw32/Tw32 (Brachyury Locus) And Control Icr Preimplantation Mouse Embryos, Ker Hwa Tung
Electronic Theses and Dissertations
The objective of the first part of this thesis is to test, in vitro, the adhesiveness of different stages of denuded preimplantation ICR mouse embryos for the substratum. In the second part, experiments are conducted to determine if there are differences in the attachment and spreading potential between tw32 homozygotes and normal embryos. Studies by Spiegelman (1976), Calarco and Brown (1968), Granholm and Johnson (1978), and others indicate that t12, tw32 and other lethal t alleles of the Brachyury or T-complex may affect cell surface properties. Thus, the objectives of this thesis include the acquisition of …
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Plant Availability Of Aqueous Phosphates Removed By Fly Ash, Paul D. Weeldreyer
Electronic Theses and Dissertations
Recycling non-renewable resources has become increasingly. important as man has continuously expected more and more from his environment. As stated by Spendlove (1976): "Recycling certainly is not new. It appears, in fact, to be one of the most obvious laws of nature, much like the seasons, the tides, and the life and death processes. It is not surprising, therefore, that the greatest motivating force behind present recycling efforts is the worldwide concern for the deteriorating natural environment." This ever-increasing demand for more production has created the need for more stringent pollution controls to maintain an acceptable quality of life. Pollution …
Utilization Of Whole Aspen Tree Material As A Ruminant Feed Component, Mahendra Singh
Utilization Of Whole Aspen Tree Material As A Ruminant Feed Component, Mahendra Singh
Electronic Theses and Dissertations
A series of three separate experiments were conducted to determine the value of aspen tree (Populus tremuloides Michx.) as a ruminant feed component in growing, finishing and wintering rations. The entire tree, including the branches, leaves and bark, was fed to Hereford steers and commercial bred stock cows. In experiment 1, sixty steers were randomly allotted to six treatments of ten each. The six treatment rations were: 93% alfalfa as control, 12% aspen, 24% aspen, 36% aspen, 48% aspen and 48% aspen (with 4% sodium hydroxide). Soybean meal was included in aspen rations in a ratio of 40% soybean meal …
The Transfer Of Resistance To Wheat Streak Mosaic Virus (Wsmv) From Wheatgrass (Agropyron Intermedium (Host.) Beauv.) To Common Wheat (Triticum Aestivum L. Em. Thell.) By Irradiation, Harnek S. Sandhu
Electronic Theses and Dissertations
A virus disease, wheat streak mosaic, has been an important, unsolved problem of winter wheat which is a major crop in South Dakota. F1BC3 monosomic alien addition seeds having three doses of Centurk were irradiated with fast neutrons to translocate a segment of the alien chromosome accounting for immunity from wheat streak mosaic virus to a Centurk chromosome. Immune plants from the irradiated seeds were used as male parents onto Centurk and about 2,000 F1BC4 seeds obtained. Cytological examination of pollen mother cells of 151 resistant F1BC4 plants indicated that the …
Feeding Value Of Brown-Midrib Corn Silage For Lactating Dairy Cows, Joel Leigh Sommerfeldt
Feeding Value Of Brown-Midrib Corn Silage For Lactating Dairy Cows, Joel Leigh Sommerfeldt
Electronic Theses and Dissertations
A 14 wk lactation trial was conducted to evaluate the feeding value of brown-midrib (bm3) corn silage and its normal (N) genetic counterpart using ten Holstein cows per group averaging 6 wk post-partum at the start of the experiment. The cow were fed corn silage (bm3 or N) ad libitum, 2.25 kg alfalfa hay/hd and grain (1 kg/3 kg milk produced) dairy. The bm3 and N, respectively. Milk production for cows fed bm3 and N was 25.0 and 25.5 kg/day. Fat corrected milk and solids corrected milk were similar for both groups. A total collection …
Methodology Development For The Study Of The Anaerobic Bacterial Flora Of Bovine Feces, Donald G. Kirsch
Methodology Development For The Study Of The Anaerobic Bacterial Flora Of Bovine Feces, Donald G. Kirsch
Electronic Theses and Dissertations
The intestinal bacterial flora of an animal has a considerable influence on the physiology of that animal. Some bacteria of the intestine are pathogenic and can initiate infections if they gain access to a susceptible individual. Some of the intestinal bacteria can produce potent carcinogens in vitro and can presumably do this also in vivo. Food passing through the alimentary tract of an animal is also chemically modified through the enzymatic action of the bacterial flora. The animal is also protected from some enteric infections through the antagonistic and competitive actions of the established organisms of the normal bacterial flora. …
Midwestern Mosaic: A Study Of The Homogeneity Of Ethnic Populations In Omaha, Nebraska, 1880, Kathleen Louise Fimple
Midwestern Mosaic: A Study Of The Homogeneity Of Ethnic Populations In Omaha, Nebraska, 1880, Kathleen Louise Fimple
Electronic Theses and Dissertations
The aim of this study is to delimit neighborhoods in an urban setting using the ethnic homogeneity of the population as the major criteria. The study will seek to compile data at a very large scale--i.e., city blocks or streets--and present cartographically an accurate delimitation of community and neighborhood. In addition, some analysis of the ethnic homogeneity of such areas will be carried out in order to assess the selective inclination of certain national groups to concentrate spatially. The specific study area is Omaha, Nebraska, in the year, 1880.
Dietary Intake And Influence Of Nutrition Education For Selected Elderly In The Congregate Meals Program, Grace E. Anderson
Dietary Intake And Influence Of Nutrition Education For Selected Elderly In The Congregate Meals Program, Grace E. Anderson
Electronic Theses and Dissertations
Nationally, the elderly know fewer facts about nutrition as compared to younger people (41). Senior citizens have relatively poor diets and many are at nutritional risk. The Congregate Meals Program (CMP) provides one low-cost meal a day, five days a week for participants over 60 years of age and their spouses. The meal is to provide one-third of the RDA for the elderly. Based on these generalities, the questions investigated in three eastern South Dakota nutrition sites, with this research are: 1) What is the contribution of the CMP in the total dietary pattern of participants as recorded on a …
Flumethasone Induction Of Parturition In The Ewe, Donald H. Rommereim
Flumethasone Induction Of Parturition In The Ewe, Donald H. Rommereim
Electronic Theses and Dissertations
The idea of controlling the time of parturition in domestic mammals has arisen in the last 15 years from the development of techniques of estrous synchronization and from studies achieved on the mechanism of birth. Controlling the time of parturition is a management technique by which a producer might reduce livestock losses at birth and/or cut production costs. Birth for the new-born, or parturition for the mother is a critical time. Controlling the time of parturition allows the producer to exercise a constrained supervision at this critical time, and therefore limit possible losses. Being present at birth allows the producer: …
Studies On The Gas Given Off By Yeast When It Goes From An Anaerobic To Aerobic Metabolism, David C. Potts
Studies On The Gas Given Off By Yeast When It Goes From An Anaerobic To Aerobic Metabolism, David C. Potts
Electronic Theses and Dissertations
Several investigators have observed that when yeast cells (yeast) go from a strictly anaerobic environment to an aerobic oner and glucose is added a negative value is recorded on the manometer. This phenomenon indicates that a gas has been given off by the yeast. The purpose of this research was to identify the gas and determine how it arises.
Application Analysis Of A Cellular Geographic Information System, Michael Edward Wehde
Application Analysis Of A Cellular Geographic Information System, Michael Edward Wehde
Electronic Theses and Dissertations
AREAS, the Area REsource Analysis System, was developed by the author as an analytical tool for resource data manipulation in a spatial context. The data base and processing software design factors relevant to economical application are reviewed. The investigation seeks to define a procedure for selection and justification of the grid cell size used to quantify the spatial domain. The performance of a cellular information system is measured in terms of mapping and inventory accuracy. These measures of performance are evaluated for various cellularizations of a single map. The interboundary distance distribution is justified as the only unique characterization of …
Bird Utilization Of Woodland Habitat In The Eastern Quarter Of South Dakota, John M. Emmerich
Bird Utilization Of Woodland Habitat In The Eastern Quarter Of South Dakota, John M. Emmerich
Electronic Theses and Dissertations
Bird utilization of narrow, riparian woodland; riparian; block-like, tree claim; and linear, single-row windbreak habitats in the eastern quarter of South Dakota were studied during the spring migration, reproductive, and winter seasons. The relative importance of these three habitats and multi-row shelterbelt habitat was evaluated using bird species diversity (BSD), bird population density, and habitat preferences of individual bird species. Cluster analysis delineated distinctive vegetation cover types in each of the three habitats studied. Bird communities associated with each cover type were tabulated for comparison purposes and predication capabilities. Multiple regression analysis predicted physical and vegetation features of each habitat …
The Effects Of Added Dry Whey On Yield And Acceptability Of Cheddar Cheese, James M. Wingfield
The Effects Of Added Dry Whey On Yield And Acceptability Of Cheddar Cheese, James M. Wingfield
Electronic Theses and Dissertations
Cheese production and sales are a major part of the U.S. dairy industry. Total hard cheese sales have increased 60% in the past 10 yr. Per capita consumption of cheese for the same period has risen from 2.81 kilograms (kg) to 4.03 kg for a 43% increase. In response to greater consumer demand the amount of milk utilized in cheese production has increased markedly during the past quarter century rising from the low of 10% of annual milk production in 1950 to 24% in 1976. This recent increase in cheese production emphasizes the importance of achieving maximum yields of cheese …
Pregnancy Diagnosis In The Ewe, Michael J. Trapp
Pregnancy Diagnosis In The Ewe, Michael J. Trapp
Electronic Theses and Dissertations
The ability to diagnose pregnancy accurately, rapidly and economically before the last six weeks of gestation in the ewe could be of real value as a sheep management tool. An efficient non-surgical pregnancy test could enable the producer to reduce feed costs, increase percent lamb crop and select for fertility. It is important to the health of the ewe and to the survival of the lamb that highly productive animals should be adequately fed. About 75% of the fetus' growth occurs during the last trimester of pregnancy. Therefore undernutrition of the ewe during this part of pregnancy leads to the …
An In-Plant Waste Survey Of An Egg-Processing Plant, James R. Schultz
An In-Plant Waste Survey Of An Egg-Processing Plant, James R. Schultz
Electronic Theses and Dissertations
The total number of eggs produced.in the United States has increased from 40 billion in 1940 to approximately 70 billion in 196 7 (1-265). It is expected that the demand for processed eggs will increase from ten percent of the total production in the 1960's to over 30 percent in the 1970's (2-805). The increase in use of processed eggs will undoubtedly result in an increase in production wastes. To estimate the water pollution potential of egg wastes and to provide the information necessary for procurement of waste discharge permits, knowledge of the volume, strength and treatability of egg-processing wastes …