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Articles 8011 - 8040 of 8968
Full-Text Articles in Entire DC Network
Ground Water Treatment At A Refuse Landfill With An Intercepting Trench, David Charles Nelson
Ground Water Treatment At A Refuse Landfill With An Intercepting Trench, David Charles Nelson
Electronic Theses and Dissertations
The objectives of the research presented herein were to continue the previous studies and to evaluate the treatment effects of the intercepting trench. This investigation afforded sufficient time after the construction of the trench for the entire landfill area to reflect the influence of the trench. In conducting this investigation, the direction of the ground water flow was defined and various chemical analyses of the ground water were made to attain these objectives.
Dna Base Composition Of Actinomyces And Related Anaerobic Diphtheroids, Patricia A. Campbell
Dna Base Composition Of Actinomyces And Related Anaerobic Diphtheroids, Patricia A. Campbell
Electronic Theses and Dissertations
The taxonomy of the anaerobic bacteria known as diphtheroids is a subject of study by the Subgroup on Taxonomy of Microaerophilic Actinomycetes, an authorized Subgroup of the Subcommittee on Taxonomy of the Actinomycetales of the International Committee on Nomenclature of Bacteria, International Association of Microbiological Societies. Dr. Gordon Robertstad, a member of this committee, has stimulated a series of studies on these organisms. At present, the species differentiation coupled with genus differentiation among anaerobic diphtheroids is in a state of flux. Tests which were previously thought to be indisputable are now not entirely reliable. Fermentation reactions, catalase tests, serology, and …
Organic Degradation Of The Ground Water In The Proximity Of A Refuse Disposal Site, Wayne Evan Mohler
Organic Degradation Of The Ground Water In The Proximity Of A Refuse Disposal Site, Wayne Evan Mohler
Electronic Theses and Dissertations
Ground water degradation resulting from refuse deposition in or near the ground water table has in recent years, become increasingly important. Although about 95 percent of the total fresh water reserves are underground sources, they presently provide only approximately 17 percent of the total amount of water used for all purposes in the country (1). There is much interest in developing ground water sources to a greater extent to supply our ever increasing demands. Not enough information is presently available to delineate accurately the effect that refuse disposal in or near the ground water has upon the quality of the …
The Ionic Requirement For Isolation Of Stable Polyribosomes From Cereal Plants And Its Relation To Sulfhydryl Protection, Merlin Dennis Breen
The Ionic Requirement For Isolation Of Stable Polyribosomes From Cereal Plants And Its Relation To Sulfhydryl Protection, Merlin Dennis Breen
Electronic Theses and Dissertations
Early attempts to isolate polyribosomes from barley tissue by the procedure of Lin and Key were unsuccessful. When analyzed by sucrose gradient centrifugation such preparations showed a particle distribution predominately in the monomer region of the gradient similar to data of Srivastava and Arglebe . Similar difficulties were also encountered with certain animal tissues. They were resolved by the addition of higher levels of KC1 to the extraction medium than used initially by Wettstein. The beneficial effects of monovalent ions can be explained In various ways. Petermann and Pavlovec suggested that high salt levels prevented the binding of extraneous proteins, …
A Study Of The Relationship Between Ceratocystis Ulmi And Elm Callus In Vitro, Charles R. Mcmullen
A Study Of The Relationship Between Ceratocystis Ulmi And Elm Callus In Vitro, Charles R. Mcmullen
Electronic Theses and Dissertations
In the course of studies dealing with the Dutch elm disease, it has become apparent that there.is a need for a rapid, efficient screening method for determining disease resistance. Tissue culture is a discipline that is now well accepted in the field of plant physiology, but is a rather new technique in the field of plant pathology. The investigations of diseased tissue, until recently, has been done with the intact plant. This study has investigated the possibility of studying the growth of the fungus on host tissue cultures as a screening technique.
The Production And Behavior Of Callus Tissue From Sorghum Vulgare, Vance J. Masteller
The Production And Behavior Of Callus Tissue From Sorghum Vulgare, Vance J. Masteller
Electronic Theses and Dissertations
The history of plant tissue culture dates back to the early 1900’s with the research of Gottleib Haberlandt in Germany. However, it was not until 1939 that any real success was achieved. Three independent scientists, Gautberet, Nobecourt, and White simultaneously through their work set the pace for plant tissue culture. Plant tissue culture is the isolation of cell or tissues from their association with other cells and tissues in the plant to one in which nutrients are supplied artificially and the cell or tissue acts as an individual. Once the plant cells or tissues have been studied at the individual …
Pharmacodynamics Of Dieldrin-C14 In Pheasants, Donald Wayne Lamb
Pharmacodynamics Of Dieldrin-C14 In Pheasants, Donald Wayne Lamb
Electronic Theses and Dissertations
The distribution, excretion, and metabolism of dieldrin-c14 in hen pheasants were studied. Eighteen laying hen pheasants were administered a gelatin capsule containing 1. 4 mg of dieldrin labelled with 5. 5 microcuries of carbon-14. Groups of three birds were killed at intervals of 2, 6, and 12 hours, and 3, 6, and 35 days following treatment. Concentrations of dieldrin residues in brain, fat, heart, liver, muscle, ovary, eggs, and feces were determined by gas chromatography and liquid scintillation counting. Dieldrin residues were present in tissues of one bird killed 2 hours after treatment. The highest average level of residues occurred …
A Food Habits Study Of Whitetail Deer In The Black Hills, James Carl Schneeweis
A Food Habits Study Of Whitetail Deer In The Black Hills, James Carl Schneeweis
Electronic Theses and Dissertations
Food habits of whitetail deer (Odocoileus virginianus) in the northern Black Hills were studied during fall and winter 1966067 and 1967-68 and also during summer 1967. Summer study was confined to aspen (Populus tremuloides) areas and involved stomach analysis and a pasture study. Fall and winter food habits were determined by stomach analysis only. Associated aspen vegetation was sampled to find a representative site for construction of a 0.7 acre enclosure. Two deer were placed in a utilization section of the enclosure for 18 days during mid-summer. Annual growth was clipped in a control section of the pasture to estimate …
Indoor Versus Outdoor Calf Rearing At Three Weaning Ages, Larry J. Jorgenson
Indoor Versus Outdoor Calf Rearing At Three Weaning Ages, Larry J. Jorgenson
Electronic Theses and Dissertations
In order to be profitable, a dairy herb must have good heifers to meet replacement needs. According to USDA (51), these needs are substantial because 25% of the cows in an average herd must be replaced each year as they no longer return a profit. Meeting these herd replacement needs has long been a serious problem of the dairyman. Nation-wide calf loss estimates ranged between 8 and 25% with an estimated annual loss to the industry of $50 million (10). South Dakota dairymen are not immune to these mortality losses and some studies (28, 52) indicate that their losses may …
Certain Blood Parameters Effected By Acute Ammonia Toxicity In Pregnant Rabbits, James P. Apland
Certain Blood Parameters Effected By Acute Ammonia Toxicity In Pregnant Rabbits, James P. Apland
Electronic Theses and Dissertations
The purpose of this investigation was to study relevant physiological events prior to and during ammonia toxicity. Blood ammonium-nitrogen (BAN) was utilized to monitor progression and intensity of toxicity. Blood pH, PC02 and P02 were measured to determine effects of ammonia toxicity on acid base balance. Total serum cholesterol was also determined. Steroid hormones and cholesterol can be synthesized from active acetate, according to Oser (1965). It was hoped that any gross changes in steroid concentrations would be reflected in a total serum cholesterol change. Juhasz (1962) found that blood cholesterol increases during starvation paralleled those of blood urea-nitrogen. He …
Factors Influencing Urinary Calculi In Lambs, Donald W. Hoar
Factors Influencing Urinary Calculi In Lambs, Donald W. Hoar
Electronic Theses and Dissertations
Two experiments were conducted to determine the interrelationships between various dietary calcium and phosphorus levels and acid-base-forming effects of the diet concerning feedlot performance and ovine phosphatic urolithiasis. Another experiment involved the interrelationships between calcium, phosphorus and potassium. All lambs used in these experiments were Texas feeder lambs of mixed breeding weighing approximately 27-30 kg. In experiment I, the treatment variables incorporated into an all concentrate, corn-soybean meal diet included 0.28 and 0.55% phosphorus, 0.14 and 0.28%-calcium and O and 2% sodium bicarbonate in a factorial design. For Experiment II, a 15% hay diet and an incomplete factorial design were …
Roughage Levels And Roughage Substitutes In High Concentrate Diets For Finishing Beef Cattle And Lambs, William M. Larson
Roughage Levels And Roughage Substitutes In High Concentrate Diets For Finishing Beef Cattle And Lambs, William M. Larson
Electronic Theses and Dissertations
Experiments were conducted with yearling beef cattle and feeder lambs to determine the effects of adding 3% oyster shells or various levels of hay to an all-concentrate diet of rolled corn grain adequately supplemented with protein, minerals and vitamins A and E. Criteria used for evaluating diets with varying amounts of roughage included feedlot performance, carcass characteristics, rumen fermentation, digestibility and concentrate replacement value of hay. In experiments with beef cattle, steers fed an all-concentrate diet gained 1.30 kg. daily with 6.79 kg. feed required per kg. gain. Adding 3% oyster shells to this diet resulted in only small effects …
A Study Of South Dakota Future Farmers Of America Who Obtained The American Farmer Degree During The Years 1951 Through 1967, Lester Wayne Mason
A Study Of South Dakota Future Farmers Of America Who Obtained The American Farmer Degree During The Years 1951 Through 1967, Lester Wayne Mason
Electronic Theses and Dissertations
This study was conducted to determine the activities of the vocational agriculture students since they received the American Farmer Degree. Are former American Farmers exhibiting leadership in their communities? Have they made progress in their occupational fields? What are their occupations? Which FFA activities are the most useful and most valuable? The purpose of this study is to answer these and similar questions. The names and local chapters of the 50 South Dakota FFA members who received American Farmer Degrees from 1951 through 1967 were secured from the State Adviser by means of a letter (Appendix A). Letters {Appendix B) …
Biological Activity Of Trimethylselenonium-Selenium And Influence Of Vitamin E On Its In Vivo Formation In Rats Using A Torula Yeast Diet, David Ding Tsair Tsay
Biological Activity Of Trimethylselenonium-Selenium And Influence Of Vitamin E On Its In Vivo Formation In Rats Using A Torula Yeast Diet, David Ding Tsair Tsay
Electronic Theses and Dissertations
During recent times, many efforts have been extended to investigate the metabolism of selenium compounds-in microorganisms, animals and plants. Several investigators (1-3) have proposed some hypothetical metabolic pathways for selenium. However, the role of selenium in the life function of animals remains unknown. Liver necrosis, as induced by the feeding of a Torula yeast diet which is unsupplemented with vitamin E and selenium, is known to be a fatal symptom in rats (4-6). The addition of either vitamin E or selenium to the diet is associated with the prevention of this condition. Schwarz (7) has suggested that vitamin E and …
The Integration Of The Sculptured Angel Motif With Religious Architecture As Influenced By Historical Precedents In France / By Nancy Anita Richardson, Nancy Anita Richardson
The Integration Of The Sculptured Angel Motif With Religious Architecture As Influenced By Historical Precedents In France / By Nancy Anita Richardson, Nancy Anita Richardson
Electronic Theses and Dissertations
No abstract provided.
The Love Ethic Of Ernest Hemingway / By Jo Harriet Strickler, Jo Harriet Strickler
The Love Ethic Of Ernest Hemingway / By Jo Harriet Strickler, Jo Harriet Strickler
Electronic Theses and Dissertations
No abstract provided.
Effects Of Aldrin On Young Pheasants Under Semi-Natural Conditions, Ronald Eugene Thill
Effects Of Aldrin On Young Pheasants Under Semi-Natural Conditions, Ronald Eugene Thill
Electronic Theses and Dissertations
Effects of aldrin on young pheasants were studied under semi-natural conditions in four one-acre enclosures during the summer of 1968. The center two-thirds of each plot was planted in corn; remaining peripheral cover was maintained in smooth brome and alfalfa. Prior to planting, center portions of two plots were sprayed with 2 pounds of aldrin per acre on Hay 20, while remaining plots served as controls. On June 12, four family units consisting of two broody pheasant hens and two bantam hens with 15 three-day-old chicks each were confined in plots. Hens and broods were given free run 10 days …
A Comparison Of Cheese Yields Produced From Normal And Abnormal Milk, Raymond L. Rennich
A Comparison Of Cheese Yields Produced From Normal And Abnormal Milk, Raymond L. Rennich
Electronic Theses and Dissertations
Mastitis has long been a problem to the Dairy Industry. All milk constituents are affected. Abnormal milk usually has a slightly higher total nitrogen and a lower casein content than does normal milk. Since the percent casein is believed to have the greatest influence on the yield of cheese, it is postulated a lower casein content in milk will produce a proportionately smaller amount of cheese for a given volume of milk. Cheese factories presently buy milk on the basis of fat percentage and weight with no regard to the amount of total protein or casein present. Therefore, it would …
Naturalism In Dreiser's Female Characters, Ann Jackson Arnold
Naturalism In Dreiser's Female Characters, Ann Jackson Arnold
Electronic Theses and Dissertations
No abstract provided.
The Quest For Identity In The Novels Of Carson Mccullers / By Regina Reese, Regina Reese
The Quest For Identity In The Novels Of Carson Mccullers / By Regina Reese, Regina Reese
Electronic Theses and Dissertations
No abstract provided.
Hawthorne's Use Of Art In The Marble Faun, Janis S. Meeks
Hawthorne's Use Of Art In The Marble Faun, Janis S. Meeks
Electronic Theses and Dissertations
No abstract provided.
An Evaluation Of Soil Surveys For Urban Land Use Planning, Paul Jonathan Barlow
An Evaluation Of Soil Surveys For Urban Land Use Planning, Paul Jonathan Barlow
Electronic Theses and Dissertations
No abstract provided.
Keat's Attributive Adjectives As An Index Of His Originality, Edith Margaret Haynes
Keat's Attributive Adjectives As An Index Of His Originality, Edith Margaret Haynes
Electronic Theses and Dissertations
No abstract provided.
Madame De Stael's De L'Allemagne : An Analysis, Richard Snow Lybarger
Madame De Stael's De L'Allemagne : An Analysis, Richard Snow Lybarger
Electronic Theses and Dissertations
No abstract provided.
A Survey Of The Use Of Convenience Foods By A Selected Group Ofhomemakers In The Westwood School District With Implications Forthe Teaching Of Foods On A High School Level, Jerry Strickland Pierce
A Survey Of The Use Of Convenience Foods By A Selected Group Ofhomemakers In The Westwood School District With Implications Forthe Teaching Of Foods On A High School Level, Jerry Strickland Pierce
Electronic Theses and Dissertations
No abstract provided.
The Histology And Fine Structure Of The Fowl Ureter (Gallus Domesticus), Harold Fred Halstead
The Histology And Fine Structure Of The Fowl Ureter (Gallus Domesticus), Harold Fred Halstead
Electronic Theses and Dissertations
No abstract provided.
Distribution Of The Fishes Of Toby Tubby Creek And Clear Creek, Tributaries Of Sardis Reservoir, Arnold Jackie Herring
Distribution Of The Fishes Of Toby Tubby Creek And Clear Creek, Tributaries Of Sardis Reservoir, Arnold Jackie Herring
Electronic Theses and Dissertations
No abstract provided.
An Investigation Of Applications Of Plastics For Women's Fashiondesigns, Elizabeth Ann Prichard
An Investigation Of Applications Of Plastics For Women's Fashiondesigns, Elizabeth Ann Prichard
Electronic Theses and Dissertations
No abstract provided.
Experimental Research In The Metamorphosis Of Figure And Environment, David Earl Burkett
Experimental Research In The Metamorphosis Of Figure And Environment, David Earl Burkett
Electronic Theses and Dissertations
No abstract provided.
Thomas Babington Macaulay : The Style Of His Essays, Sharon Robinson Bolton
Thomas Babington Macaulay : The Style Of His Essays, Sharon Robinson Bolton
Electronic Theses and Dissertations
No abstract provided.