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Articles 8221 - 8250 of 8968
Full-Text Articles in Entire DC Network
Evaluation Of The Effects Of Low Temperature On The Anaerobic Digestion Of Animal Wastes, Anthony Thomas Voell
Evaluation Of The Effects Of Low Temperature On The Anaerobic Digestion Of Animal Wastes, Anthony Thomas Voell
Electronic Theses and Dissertations
The history of anaerobic sludge digestion has shown an ever increasing body of knowledge concerning the causes and operation of anaerobic organic wastes. Two of the earliest methods used in he anaerobic treatment of organicwastes were cesspools and septic tanks. The theory of the design of these units was based upon retaining the waste material and allowing it to undergo bacterial decomposition. An improvement in the anaerobic treatment process was made with the advent of the Imhoff tank. In this unit the sedimentation and digestion portions were separated so that the sludge digestion unit was not in contact with the …
A Comparison Of Corn Silage And Forage Sorghum Silage In The Production Of Beef, Herbert Lawrence Sorbel
A Comparison Of Corn Silage And Forage Sorghum Silage In The Production Of Beef, Herbert Lawrence Sorbel
Electronic Theses and Dissertations
Production of silage per acre varies in different areas of the United States. The type of forage used has a large effect on the tonnage of silage produced. Two of the common crops used for high production of silage in South Dakota are corn and forage sorghum. When stored as silage, sorghum has produced as high as 27 tons of feed yielded on and one-half to two times as many tons of silage per acre of corn. Ruminant animals are well adapted to utilizing large amounts of roughages in their rations. These animals have the capacity to consume three to …
Aflatoxin Formation On Selected Human Foods By Strains Of Aspergillus Flavus, Link, And Penicillium Rubrum, Stroll, Ronald Arlyn Sonstegard
Aflatoxin Formation On Selected Human Foods By Strains Of Aspergillus Flavus, Link, And Penicillium Rubrum, Stroll, Ronald Arlyn Sonstegard
Electronic Theses and Dissertations
The occasional contamination of foods by biologically active compounds arising from metabolic processes of mold contamination represents a situation which has probably existed since prehistoric times. This is due in part to the ubiquitous distribution of fungi and the frequent opportunity for their growth during the harvest and subsequent storage of foods, and the recognized capabilities of these organisms to produce complex molecules. Within the last decade an increasing body of knowledge has become available concerning the effects of carious deleterious biological metabolites on the health of animals and man. Increased sophistication of methods and approaches to biological problems and …
The Feasibility Of Establishing Beef Processing Facilities In South Central South Dakota And North Central Nebraska, David Tong-Yong Lee
The Feasibility Of Establishing Beef Processing Facilities In South Central South Dakota And North Central Nebraska, David Tong-Yong Lee
Electronic Theses and Dissertations
The sale of livestock is an important source of farm income for both South Dakota and Nebraska producers. In 1964 cash income derived from livestock sales by producers included 68.1 percent of South Dakota’s total cash farm income. (1) The average for the four year period 1960 to 1963 was 479 million dollars per year. During the ten year period, 1956 to 1965, beef cow numbers in South Dakota increased from 1,320,000 to 1,724,000. The relative proportion of beef cows in the United States that was on hand in the states of South Dakota and Nebraska for the years 1956 …
An Analysis And Evaluation Of Chemical Education Selected South Dakota Secondary Schools, Bernal A. Kiser
An Analysis And Evaluation Of Chemical Education Selected South Dakota Secondary Schools, Bernal A. Kiser
Electronic Theses and Dissertations
In the past fifty years, numerous achievements have been made in the science of chemistry. Such achievements have required changes, both in industrial chemistry and in the teaching of chemistry. Traditionally, beginning chemistry has been taught as a descriptive science. Even presently, many secondary schools, colleges, and universities, offer a factual course emphasizing the factual data rather than the basic principles. Although teaching chemistry descriptively has appeared adequate in the past, because of the extensive volume of knowledge available today, such a method of instruction seem questionable. More than ever before there seems to be a need for a logical …
Guidelines For The Establishment Of Private Game Management Areas As An Alternate Use Of Cropland To Supplement Farm Income In South Dakota, Galen L. Kelsey
Guidelines For The Establishment Of Private Game Management Areas As An Alternate Use Of Cropland To Supplement Farm Income In South Dakota, Galen L. Kelsey
Electronic Theses and Dissertations
The wealth that flows into South Dakota from nonresident hunter purchases of license, equipment and supplies, room and board, gasoline, and various other hunting services is an important addition to the state’s economy. Is 1953 is was estimated the average nonresident pheasant hunter spent a total of $131 (1,2). A 1959 estimate placed per capita spending of the nonresident hunter at $203.39. (3) In 1963, 204,210 small game licenses were sold; 68,901 or 37.7 per cent were to nonresidents. Total spending by nonresidents for licenses that year was $1,722,525.
Chlorinated Hydrocarbon Residues In Representative Wild Ruminants Of South Dakota, Raymond J. Greenwood
Chlorinated Hydrocarbon Residues In Representative Wild Ruminants Of South Dakota, Raymond J. Greenwood
Electronic Theses and Dissertations
Insecticides play a major role in the economy of South Dakota which is basically an agricultural state. Large tracts of land in cultivation and pasture offer unlimited propagating areas for injurious plant insects. Natural control measures are not always adequate to ward off frequent outbreaks of these insects. As a result steps have been taken to minimize the chance of these outbreaks developing into epidemic proportions. The application of chlorinated hydrocarbon insecticides has been among the control measures employed. (see more in text)
A Histological Study Of The Various Tissue Components Of Raw And Cooked Longissimus Dorsi Muscle In Pork, Dorothy E. Deethardt
A Histological Study Of The Various Tissue Components Of Raw And Cooked Longissimus Dorsi Muscle In Pork, Dorothy E. Deethardt
Electronic Theses and Dissertations
Muscle fibers and connective tissue are known to affect tenderness. The partitioning of these two structures was first attempted by Lehman as early as 1897 (Wilson, et, al, 1954). Since that time chemical and histological work has been examined extensively to relate tissue components to tenderness. This study was undertaken to evaluate: (1) the effect of fixatives on (a) the reticular, collagenous, and elastic connective tissue of raw and cooked pork muscle and (b) the fiber diameter in the raw state; (2) the type and amount of connective tissue in pork muscle and the effect of heat on the various …
Helminth Parasites Of Wild Ruminants In South Dakota, Major L. Boddicker
Helminth Parasites Of Wild Ruminants In South Dakota, Major L. Boddicker
Electronic Theses and Dissertations
Reports of mass and local mortalities caused or influenced by helminth infestations indicate that helminth parasites are natural control agents. Little is known concerning the limiting effects helminths have on ruminant populations. It is known that helminths have on wild ruminant populations. It is known that helminths parasitic in domestic livestock often infest wild ruminants. Swales (1935) and various other workers indicated that serious pathogens in livestock may cause little or no harm in wild ruminants. Thysanosoma actinioides, the fringed tapeworm, which obstructs the bile ducts of sheep, has never been reported as a serious pathogen in wild ruminants. Game …
Hydrologic Aspects Of Water Harvesting, Sidney W. Black
Hydrologic Aspects Of Water Harvesting, Sidney W. Black
Electronic Theses and Dissertations
As is most Midwestern states, livestock consumption, human consumption, irrigation, recreation, and wildlife are all in competition for the available water supplies in South Dakota. It is the purpose of this study to develop design criteria for a more efficient system of collection water to assist in satisfying the vast demands of livestock consumption. A moisture shortage can be the downfall of any livestock producer. There are roughly 728 million acres of rangeland in the continental United States with 26.7 million acres in South Dakota (18). Most of this area is available for domestic livestock grazing, but a large portion …
Dieldrin Residues In Eggs And Fat Of Penned Pheasant Hens, Donald Wayne Lamb
Dieldrin Residues In Eggs And Fat Of Penned Pheasant Hens, Donald Wayne Lamb
Electronic Theses and Dissertations
At present, there is considerable interest in the effects of insecticides upon our wildlife populations. It is well known that chlorinated hydrocarbon insecticides are present in tissues and eggs of birds that receive these chemicals in their diets. Some workers, for example Gene11y and Rudd (1956) and DeWitt (1956), studied the effects of different levels of ingested insecticides on the reproduction of game birds. Additional studies are needed to relate the amount of insecticide in the diet to the level in the egg and that in turn to reproduction and effects on young birds. Work on pheasants is of special …
Population Distribution And Mobility Of Deer In Eastern South Dakota, Rollin De Mers Sparrowe
Population Distribution And Mobility Of Deer In Eastern South Dakota, Rollin De Mers Sparrowe
Electronic Theses and Dissertations
Population distribution and mobility of deer were studied intensively along a 15-mile stretch of the Big Sioux River, and less intensively on an expanse of 1400 square miles in central eastern South Dakota. Objectives were to determine relative population numbers and distribution of deer, the extent of their daily and seasonal movements, and the principal factors influencing these populations and movements, and to test winter hard counts as a population index. Deer were captured in Clover traps or with a Cap-Chur gun and were marked individually with ear tags, ear streamers, and collars. Some deer were tracked by radio telemetry. …
Robert Browning And His Literary Father / By Frances Landrum Tyler, Frances Landrum Tyler
Robert Browning And His Literary Father / By Frances Landrum Tyler, Frances Landrum Tyler
Electronic Theses and Dissertations
No abstract provided.
Limnology Of Three Farm Ponds In South-Central South Dakota, Larry Kim Graham
Limnology Of Three Farm Ponds In South-Central South Dakota, Larry Kim Graham
Electronic Theses and Dissertations
Physical, chemical, and biological aspects of three farm ponds in south-central South Dakota were studied from June 1964 until December 1965. Maximum water temperature at the surface reached 25.2 C, while water temperatures at the bottom of the ponds were about 2 to 4C lower than the surface. Light transmission was influenced by turbidity but generally penetrated to the bottom of the ponds except during periods of cloudy ice and snow cover. Dissolved oxygen was near saturation during periods of open water. Most chemical ions in the ponds increased annually from a winter minimum to a spring maximum. Total dissolved …
Factors Influencing Anaerobic Pond Treatment Of Meat Packing Waste, Tracy James Tofflemire
Factors Influencing Anaerobic Pond Treatment Of Meat Packing Waste, Tracy James Tofflemire
Electronic Theses and Dissertations
The objectives if the research were threefold: 1. To determine the effect of increased kill and loading on an anaerobic pond system treating meat packing wastes. 2. To determine the effect of recirculation in an anaerobic pond system treating meat packing wastes. 3. To determine the insulating effect of a meat waste grease-scum. The extent of the research was limited to the anaerobic system.
Samples and records were taken at the MID Packing Company from November 1965 through March 1966. During the first period of sampling, data were collected which made possible an evaluation of the effect of higher kill. …
Lipid And Amino Acid Studies Of Selenium Toxicity With The Rat, Mary Jane Abraham
Lipid And Amino Acid Studies Of Selenium Toxicity With The Rat, Mary Jane Abraham
Electronic Theses and Dissertations
Selenium exhibits unusual biological properties in that it is a micro nutrient for animals (1) and some plants (2) and yet at slightly higher levels it may be very toxic (3,4). Neither the active forms of selenium nor the mechanisms by which its biological effects are produced are well understood. Thus, many aspects remain to the investigated in this area. Franke (9), while working with the affected grain at South Dakota State College, produced the toxic symptoms experimentally. Following the discovery by Robinson (10) of selenium in toxic forages and grains. Franke (12) further deduced that plants incorporate soil selenium …
Increasing Income On 240 And 400 Acre Farms In Lac Qui Parle County, Minnesota, George M. Gehant
Increasing Income On 240 And 400 Acre Farms In Lac Qui Parle County, Minnesota, George M. Gehant
Electronic Theses and Dissertations
The purpose of this study is to evaluate alternative farm organizations for future modal-sized farms in Lac qui Parle County, Minnesota. The evaluation, to be made by farm managers, will be based on a complete operating statements. The summary data is presented in a tabular form so the all of the alternatives may be readily compared. The trend toward the substitution of capital for labor to decrease the cost per unit of production is observable on farms in Lac qui Parle County. This capital is represented in improved methods and new technology. Both of these may save labor by themselves, …
The Effect Of Methods Of Storage On The Gross Energy, Chemical Composition And Feeding Value Of Alfalfa, Guru Prasad Mohanty
The Effect Of Methods Of Storage On The Gross Energy, Chemical Composition And Feeding Value Of Alfalfa, Guru Prasad Mohanty
Electronic Theses and Dissertations
Production of good quality hay or silage and its proper storage without loss of the nutritive value is an important problem for dairy farmers. They are particularly interested in meeting the energy needs in feeding their herds for milk production. During the past decade there has been a substantial increase in the volume and intensity of research towards the nutritional and calorimetric aspects of cattle feeds. A number of unavoidable problems come in the way of their application causing financial disaster in today’s competitive economy of dairy farming. To increase milk production or to maintain a high level of production, …
The Athenian Theatre : The Religious Nature Of Its Development, Organization, Production / By Nathaniel Vick Robbins, Iii, Nathaniel Vick Robbins Iii
The Athenian Theatre : The Religious Nature Of Its Development, Organization, Production / By Nathaniel Vick Robbins, Iii, Nathaniel Vick Robbins Iii
Electronic Theses and Dissertations
No abstract provided.
Cytogenetic Effects Of X-Irradiation In The Male Mouse, Daniel White Bath Jr
Cytogenetic Effects Of X-Irradiation In The Male Mouse, Daniel White Bath Jr
Electronic Theses and Dissertations
No abstract provided.
The Application Of Section 1231 To Cattle Operations, Anthony E. Hale
The Application Of Section 1231 To Cattle Operations, Anthony E. Hale
Electronic Theses and Dissertations
No abstract provided.
A Subjective Visualization Of Three Natural Energetic Phenomena Electricity, Magnetism, And Atomism, As Depicted In The Forms Of Charts, Graphs, And Diagrams, James Gordon Hargett
A Subjective Visualization Of Three Natural Energetic Phenomena Electricity, Magnetism, And Atomism, As Depicted In The Forms Of Charts, Graphs, And Diagrams, James Gordon Hargett
Electronic Theses and Dissertations
No abstract provided.
A Study Of Teaching Experiences In Relation To The Development Of Certain Scientific Concepts By Nursery School Children, Cylian Skinner Law
A Study Of Teaching Experiences In Relation To The Development Of Certain Scientific Concepts By Nursery School Children, Cylian Skinner Law
Electronic Theses and Dissertations
No abstract provided.
A Study Of Role Conflicts Between White And Negro Employees In The Jackson, Mississippi, Head Start Project, June-August, 1965, Meighan George Johnson
A Study Of Role Conflicts Between White And Negro Employees In The Jackson, Mississippi, Head Start Project, June-August, 1965, Meighan George Johnson
Electronic Theses and Dissertations
No abstract provided.
Stark Young : A Study Of His Interest In Italy And The Influence Of Italy On His Life And His Works, Ann Appleton Laster
Stark Young : A Study Of His Interest In Italy And The Influence Of Italy On His Life And His Works, Ann Appleton Laster
Electronic Theses and Dissertations
No abstract provided.
Discrimination Learning As A Function Of Intensity Of Reinforcing Stimuli, James Cooper Brown
Discrimination Learning As A Function Of Intensity Of Reinforcing Stimuli, James Cooper Brown
Electronic Theses and Dissertations
No abstract provided.
Prophecy And Prophetic Elements In Shakespeare's Plays, Emory Davis Jones
Prophecy And Prophetic Elements In Shakespeare's Plays, Emory Davis Jones
Electronic Theses and Dissertations
No abstract provided.
A Comparison Of Animism Conceptualization Of Four- And Five-Yearold Children Of Upper Socio-Economic Status And Of Poverty Status, Rosemary Latimer Fisher
A Comparison Of Animism Conceptualization Of Four- And Five-Yearold Children Of Upper Socio-Economic Status And Of Poverty Status, Rosemary Latimer Fisher
Electronic Theses and Dissertations
No abstract provided.
Ecology And Partial Characterization Of Bacteriophages In Wastewater, Thomas Kent Donovan
Ecology And Partial Characterization Of Bacteriophages In Wastewater, Thomas Kent Donovan
Electronic Theses and Dissertations
No abstract provided.
3-Aminoalkyl-2-Benzoalinones / By Jimmie Lloyd Valentine, Jimmie Lloyd Valentine
3-Aminoalkyl-2-Benzoalinones / By Jimmie Lloyd Valentine, Jimmie Lloyd Valentine
Electronic Theses and Dissertations
No abstract provided.