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Articles 1 - 30 of 41
Full-Text Articles in Life Sciences
Zinc Uptake In Loblolly Pine Seedlings, Victor Zillmer
Zinc Uptake In Loblolly Pine Seedlings, Victor Zillmer
Electronic Theses and Dissertations
Zinc concentrations in the root, terminal growth, stem, and needles of loblolly pine (Pinus taeda L.) were measured in 72 seedlings grown in washed sand, fertilized with Zn(N03)2. Zinc treatment periods were early spring, late spring, and summer. Zinc uptake was the greatest in early spring. Zinc nitrate fertilizer and remaining soil zinc at treatments end had no effect on mycorrhizae, height, or diameter growth. Linear and multiple regressions were derived using residual soil zinc and treatment zinc that can predict zinc concentrations in different plant parts that have r values from .7440 to .8170. Linear regressions for the prediction …
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.
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.
Primary Productivity In Lake Cochrane, South Dakota, During And After Sediment-Control Dam Construction, Randall Francis Brich
Primary Productivity In Lake Cochrane, South Dakota, During And After Sediment-Control Dam Construction, Randall Francis Brich
Electronic Theses and Dissertations
Lake Cochrane was selected for this study because of its history of superior water transparency (Haertel 1972, 1976b). Significant amounts of silt and chemicals enter the lake with runoff at 3 locations (Haertel unpublished data). Restriction or impediment of runoff at these locations should result in improved water transparency (Haertel 1976b, Siegel 1975). Therefore, East Dakota Conservancy Sub-District and the South Dakota Department of Wildlife, Parks, and Forestry decided to impede runoff waters by means of 3 sediment-control dams incorporated into the perimeter road system of the lake and financed through a grant from the Environmental Protection Agency (Siegel 1975) …
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 …
Anatomical Studies During Floral Induction, Evocation And Initiation In Eucharis Grandiflora, Planch., The Amazon Lily, Raphael T. Deba
Anatomical Studies During Floral Induction, Evocation And Initiation In Eucharis Grandiflora, Planch., The Amazon Lily, Raphael T. Deba
Electronic Theses and Dissertations
Several questions were posed at this point which led to the hypotheses to be tested in this investigation. The experimental design was divided into 3 phases. For a detailed description of the design, see Appendix A. Phase I of this study involved a comparative study of the anatomy of the apices of plants of Eucharis grandflora, the Amazon lily, exposed to heat (27-29° C) for one, two, three, four or five weeks, in an effort to see if manifestations of floral evocation and/or initiation are in evidence when compared to the control. Since the time from the end of heat …
Partial Characterization And Comparison Of Rhizobia From Astragalus Flexuosus Glycyrrhiza Lepidota, And Trifolium Spp., Elmer L. Eide
Partial Characterization And Comparison Of Rhizobia From Astragalus Flexuosus Glycyrrhiza Lepidota, And Trifolium Spp., Elmer L. Eide
Electronic Theses and Dissertations
Biological nitrogen fixation, a means of alleviating our increasing dependence on synthesized nitrogen fertilizers, is being studied with renewed interest. Production of nitrogen fertilizer requires large amounts of natural gas and other non-renewable energy sources, while the energy for biological nitrogen fixation is derived either directly or indirectly from photosynthesis. With only limited supplies of natural gas and an increasing population, and thus increasing demand for food, the advantages and even necessity of understanding and enhancing biological nitrogen is obvious. The nitrogenase enzyme complex which catalyzes the reduction of dinitrogen to ammonia is possessed by a limited number of species …
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
The Effect Of Foliar Fertilization On Soybean Yield And Leaf Necrosis, Robert Jay Goos
Electronic Theses and Dissertations
The soybean (Glycine max (L.) Merrill) is a very important world crop. The seed is rich in both protein and oil, making it a valuable human food resource. Many scientists believe that there are physiological barriers preventing increased soybean yields. Any agronomic discovery that would consistently increase soybean yields would be important to world food production. One possible yield barrier in soybeans concerns the mineral nutrition of the plant during the seed-filling stages of growth. During this period of growth, translocation of N, P, K, and S from the plant foliage to the developing seed occurs, accompanied by a virtual …
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.
Nonsporing Anaerobic Bacteria In Foods, Sylvia M. Huppler
Nonsporing Anaerobic Bacteria In Foods, Sylvia M. Huppler
Electronic Theses and Dissertations
Anaerobic non spore forming bacteria are not detected in routine food examinations, and their occurrences in foods has seldom been reported in the literature. The purpose of this study is to determine the occurrence of non-spore forming anaerobes, the identification of the isolates found, and the possible growth and multiplication in foods which might contribute to spoilage or food illness.
Discharge Measurement And Energy Efficiency Evaluation Of Irrigation Pumping Plants, Bruce A. Jennings
Discharge Measurement And Energy Efficiency Evaluation Of Irrigation Pumping Plants, Bruce A. Jennings
Electronic Theses and Dissertations
No information has been available regarding efficiencies of electric irrigation pumping plants in South Dakota. Pumping plant discharge, a key parameter in the calculation of pumping plant efficiency, is often difficult to measure in the field. A project was initiated at South Dakota State University in 1976 to investigate field pumping plant efficiencies. The following objectives were established for the project. 1. To investigate various methods of measuring irrigation pumping plant discharge. 2. To develop a suitable field procedure for determining electric irrigation pumping plant efficiency. 3. To measure energy efficiency of selected electric irrigation pumping plants in South Dakota.
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 …
Partial Purification Of Heat Stable Enterotoxin Produced By Escherichia Coli Isolated From A Case Of Porcine Colibacillosis, Lee Ann Zochert Swanson
Partial Purification Of Heat Stable Enterotoxin Produced By Escherichia Coli Isolated From A Case Of Porcine Colibacillosis, Lee Ann Zochert Swanson
Electronic Theses and Dissertations
Colibacillosis (CB) in livestock is an economically important disease caused by the bacterium Escherichia coli. It is estimated that nearly one third of all baby pigs born in South Dakota die prior to weaning, and one fourth of these deaths is believed to be caused by CB (62). Similarly, it has been stated that 6 to 20% of calves born alive die from this disease (3). The term colibacillosis encompasses a group of diseases caused by E. coli in neonatal and weaned animals and humans (3). The several different types of CB are due to the differences in tissue localization …
Blood Gases And Certain Energy Metabolite Concentrations In Ammonia Intoxicated Sheep, George E. Romkema
Blood Gases And Certain Energy Metabolite Concentrations In Ammonia Intoxicated Sheep, George E. Romkema
Electronic Theses and Dissertations
The objectives of this study were to measure the changes occurring in certain blood parameters during acute ammonia intoxication. It was hoped that these changes would reflect and thereby provide insight into the effects of acute ammonia intoxication on metabolic processes. Blood pH, p02, and pC02 were measured in order to observe possible metabolic disturbances as reflected in the acid-base balance. Glucose was measured due to its importance as a basic energy source and metabolic intermediate. Volatile fatty acids were measured because they serve as an important energy source in ruminants. Non-esterified fatty acids and triglycerides were …
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 …
The Influence Of Isotonic And Isokinetic Weight Training On Vertical Jumping Proficiency, Jeffrey Thomas Spielman
The Influence Of Isotonic And Isokinetic Weight Training On Vertical Jumping Proficiency, Jeffrey Thomas Spielman
Electronic Theses and Dissertations
The purpose of this study was to determine the influence of isotonic and isokinetic weight training on vertical jumping proficiency as measured by a modified vertical jump. The subjects were college students enrolled in the Fitness and Lifetime Activities Program at South Dakota State University in Brookings, South Dakota. Isotonic and isokinetic training were assigned to the two experimental groups with the third group serving as controls. Training for the experimental groups consisted of isotonic circuit training on a Universal weight machine and isokinetic training on a Leaper machine. Data analysis included a reliability and reproducibility assessment, and a one-way …
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. …
Rotaviral Enteritis In Gnotobiotic Pigs: A Scanning Electron Microscopic Study, Marcus W. Johnshoy
Rotaviral Enteritis In Gnotobiotic Pigs: A Scanning Electron Microscopic Study, Marcus W. Johnshoy
Electronic Theses and Dissertations
The objectives of this study were: 1. To experimentally reproduce rotaviral diarrhea in gnotobiotic pigs. 2. To determine the appearance of the normal intestine by scanning electron and light microscopy. 3. To compare by scanning electron and light microscopy the appearance of segments from different areas of intestine and to determine the development, location, and severity of rotaviral lesions in gnotobiotic pigs.
Effects Of Gamma Radiation On The Southern Corn Rootworm, Denise Gayle Hanson
Effects Of Gamma Radiation On The Southern Corn Rootworm, Denise Gayle Hanson
Electronic Theses and Dissertations
Insects continue to be one of the major problems of man. It is, however, becoming more and more difficult to find substances that are effective in controlling insects and that are environmentally safe. It has become apparent that to control or eliminate harmful insects, alternate methods of control must be developed to replace or reduce the use of insecticides. One possible alternate method of control is to use insects against themselves in a process called the sterile male technique. This technique generally uses gamma radiation to induce sterility in males. When they are released into the native population and mate …
Effects Of Strain On Response Of Laying Hens To Low Protein Diets And Amino Acid Supplements, Ali B. Kashani
Effects Of Strain On Response Of Laying Hens To Low Protein Diets And Amino Acid Supplements, Ali B. Kashani
Electronic Theses and Dissertations
Corn is by far the most widely used cereal grain in the United States for poultry feeding. In addition to its high energy content, corn provides adequate amounts of the essential fatty acids for maximum rates of growth and egg production. Palatability and ample xanthophyll and provitamin A contents of fresh corn are some o the other contributing factors for its popularity in livestock feeding. The most serious limitation in the nutritional value of corn as well as other cereal grains lies in the fact that they are low in both quantity and quality of protein. It has been a …
Monensin, Protein Supplementation And Tylosin For Feedlot Cattle, Roger N. Gates
Monensin, Protein Supplementation And Tylosin For Feedlot Cattle, Roger N. Gates
Electronic Theses and Dissertations
Scientific research has made substantial contributions to the efficiency of American agriculture. Livestock producers in particular have benefited from the extensive study of animal nutrition. Nutrient requirements of animals and the nutrient composition of feeds are essential to efficient and economical feeding of farm animals. Research over many years has provided considerable information on animal requirements and feed composition. While there are still many gaps of knowledge in those areas, available information allows wise choice in selecting feedstuffs and using them in various combinations to meet animal requirements for various productive purposes. Feed costs represent the single largest expenditure in …
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: …
Performance Of A Diurnally Tracking Solar Energy-Intensifier, Calvin E. Siegel
Performance Of A Diurnally Tracking Solar Energy-Intensifier, Calvin E. Siegel
Electronic Theses and Dissertations
The United States agricultural system provides numerous opportunities in which solar energy can be utilized. Low to moderate temperature rise collectors can provide a large percentage of the energy requirements normally met by using high quality fossil fuels. As world demand for food production increases due to a growing population, alternative sources of energy need to be developed and applied as substitutes for these increasingly scarce fossil fuels. Agriculture offers practical advantages for the use of solar heat energy because there exists sufficient area for solar collectors and a wide range of temperature applications on most farmsteads. Demand for energy …
Water And Nitrogen Husbandry For Irrigated Corn In Central South Dakota, Stanley Eugene Papendick
Water And Nitrogen Husbandry For Irrigated Corn In Central South Dakota, Stanley Eugene Papendick
Electronic Theses and Dissertations
The purpose of this study was to evaluate the effects of supplemental water and nitrogen on corn yields. Central South Dakota was chosen as the location for this study because of its existing irrigation and the limited research data available from that part of the state. The objectives were: (1) to determine corn yield response to various water regimes, (2) to determine corn yield response to nitrogen applications, and (3) to determine corn yield response to nitrogen application methods.
An Electron Microscopic Investigation Of Bovine Abortion, Hans A. Draayer
An Electron Microscopic Investigation Of Bovine Abortion, Hans A. Draayer
Electronic Theses and Dissertations
Bovine abortion continues to cause economic loss to farmers and ranchers. In South Dakota, monetary loss from bovine abortion has been estimated at 4 to 4.8 million dollars annually. (31) Brucellosis was once considered the major cause of bovine abortion. Since the prevalence of brucellosis has been reduced to less than 1% of the total United States cattle population, there has been an increase in demand for laboratory assistance in the diagnosis of the causes of bovine abortion. With the present day technology in microbiology, histology, and serology, a confirmed identification of the causative agent of bovine abortion can be …