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Articles 4141 - 4170 of 4194
Full-Text Articles in Physical Sciences and Mathematics
Some Life History And Ecological Activites Of The Richardson Ground Squirrel In South Dakota, Dean Robert Gunderson
Some Life History And Ecological Activites Of The Richardson Ground Squirrel In South Dakota, Dean Robert Gunderson
Electronic Theses and Dissertations
Whenever man has gone he has changed his environment to suit his needs. Because of his need for food, man has plowed up the prairies and converted the grasslands to grain fields. Before white man settled the Great Plains, range rodents such as the prairie dog and the ground squirrel existed undisturbed and unmolested except by their natural predators. With the advent of cultivated crops, the range herbivores found a new and tasty source of food. Among these primary consumers which took advantage of man’s interference with the natural prairie was the Richardson ground squirrel, Citellus richardsoni (Figure 1). During …
Fall Food Habits Of The Merriams' Wild Turkey In Western South Dakota, Curtis Martin Twedt
Fall Food Habits Of The Merriams' Wild Turkey In Western South Dakota, Curtis Martin Twedt
Electronic Theses and Dissertations
The several varieties of wild turkey (Meleagris gallopavo) formerly ranged over much of what is now eastern, central and southwestern United States. A large portion of the species habitat was destroyed by logging and by clearing forest land for agricultural use. Wild turkey population, were also directly decimated because of bunting by early settlers. Edminister (1954) estimated present Wild turkey range to be approximately 1 per cent of the historic range. In the past few decades, wild turkey population have increased to the point where the species has begun to assume a prominent place among the game birds. . . …
Determination Of Minimum Lethal Level Of Toxaphene As A Piscicide In Lakes Of North Dakota, Dale L. Henegar
Determination Of Minimum Lethal Level Of Toxaphene As A Piscicide In Lakes Of North Dakota, Dale L. Henegar
Electronic Theses and Dissertations
Toxaphene as a piscicide for localized field application has not been widely used because minimum lethal concentrations have not been in the field. There is, however, considerable information gained from laboratory bio-assay studies (Surber, 1498; Duedoreff, et al. 1953; Hooper and Grzenda, 1955, et al. 1959). Concentrations indicated by such studies are not necessarily correct for field use. Prevost (1960) pointed out that results from controlled laboratory experiments do not always yield dosages exhibiting similar results in the field where a number of variables, both known and unknown, exist over which the field worker has little or no control. Gebhards …
Some Limnological Conditions Relative To Winter Kill Of Fish In Ice-Covered Representative Farm Ponds In Eastern South Dakota, Jerome L. Johnson
Some Limnological Conditions Relative To Winter Kill Of Fish In Ice-Covered Representative Farm Ponds In Eastern South Dakota, Jerome L. Johnson
Electronic Theses and Dissertations
An aquatic environment involves many complex relationships biologically, physically, and chemically. Many of these relationships are difficult to measure or are little understood. In nature, aquatic environments accommodate many types of aquatic life. Ecological disturbances may cause the environment to become unfit for economically important forms of life. Human interferences often causes polluted waters and naturally occurring disturbances are common. A disturbance of this kind is one of the major problems of fisheries management in the northern Great Plains area – seasonal anaerobosis of fish or other aquatic animals and plants, commonly known as winter kill. Winter kill is usually …
Wildlife Utilization Of Stock Ponds In Minnehaha County, South Dakota, James D. Swanson
Wildlife Utilization Of Stock Ponds In Minnehaha County, South Dakota, James D. Swanson
Electronic Theses and Dissertations
Introduction: Man’s agricultural activities in South Dakota have greatly altered environmental conditions for nearly all forms of wildlife. Draining and ditching in eastern South Dakota have decreased the acreage of wetlands available to waterfowl and furbearers. Results of conversation practices carried out under the Agricultural Conservation Program as reported by the U. S. Department of Agriculture (1) show that between 1936 and 1937 South Dakota farmers had drained 760,198 acres. Drainage of wetland areas changed once valuable wildlife habitat into drylands which are of little value to waterfowl and furbearers. Waterfowl breeding grounds have been so greatly reduced that few …
Nesting Of Mourning Doves In Eastern South Dakota, Lloyd E. Oldenburg
Nesting Of Mourning Doves In Eastern South Dakota, Lloyd E. Oldenburg
Electronic Theses and Dissertations
The mourning dove¹, not presently a game bird in South Dakota, is gaining support toward that status. During the 1959 state legislative season a bill sponsored by the Department of Game, Fish and Parks to place the mourning dove on the game bird list was passed by the House and defeated by the Senate. In a special dove issue of Outdoor California, January 1959, W.K. Kiel (9) stated there are currently 30 states which allow dove hunting. No state bordering South Dakota has an open dove season. However, in a special memorandum of March 7, 1958, the Nebraska Game, Forestation …
Analysis Of Summer Spotlighting For Determining Deer Populations Indices, Donald C. Duerre
Analysis Of Summer Spotlighting For Determining Deer Populations Indices, Donald C. Duerre
Electronic Theses and Dissertations
Man changes his environment to suit his needs. In doing so he has destroyed forests, plowed the land, and built cities. Deer have adopted themselves to these changes, and in many instances populations have erupted as a result. Their ability to survive advancement of civilization and increasing hunting pressure has made deer the most important big-game animal in America, The importance of deer as a game animal has caused game agencies to institute more intensive management programs. Proper management of this species has long been a problem of game technicians. In order to obtain an optimum annual harvest, the technician …
Age And Growth Determination Of The Black Bullhead From Soft Fin Rays, James W. Sprague
Age And Growth Determination Of The Black Bullhead From Soft Fin Rays, James W. Sprague
Electronic Theses and Dissertations
Introduction: Knowledge of the age of individuals comprising populations of fish is essential to the fishery biologist. From such information he is able to calculate the rate of growth, determine the age at which sexual maturity is attained and the longevity of the species. These calculations and determinations can be applied in the management of populations and in setting fishery regulations. There are numerous methods being used to determine the age of an individual fish. Of these, the scale method is the most important means of age determination being utilized with species of fish possessing scales (Cooper, 1951). This method …
Evaluation Of Walleye Fingerling Plants In Lake Darling, North Dakota, George L. Van Wyhe
Evaluation Of Walleye Fingerling Plants In Lake Darling, North Dakota, George L. Van Wyhe
Electronic Theses and Dissertations
The walleye, Stizostadion vitreum vitreum (Mitchell) is the largest American member of the perch family (Peraidae); it represents the subfamily Luciopercinae in our waters. The walleye has a wide range of distribution which, according to hubs and lagler (1949), extends “From Great Slave Lake, the Saskatchewan River system and the Hudson Bay region to Labrador; southward on the Atlantic slope to North Carolina, and west of the mountains, to the Alabama River system of Georgia to the Tennessee River drainage of Alabama and to northern Arkansas and Nebraska. Common through the Great Lakes and many of the inland lakes and …
An Investigation Of The Effects Of Wave Propagations In An Infinite Membrane Upon The Motions Of Salt Particles On The Surface, Robert Talmadge Maupin
An Investigation Of The Effects Of Wave Propagations In An Infinite Membrane Upon The Motions Of Salt Particles On The Surface, Robert Talmadge Maupin
Electronic Theses and Dissertations
No abstract provided.
Digestion Studies With Sheep And Wild Antelope On A Sagebrush Ration, Paul Harold Kohler
Digestion Studies With Sheep And Wild Antelope On A Sagebrush Ration, Paul Harold Kohler
Electronic Theses and Dissertations
Introduction: Those who are responsible for the management of antelope, range livestock, and the range seek to maintain such a balance that al may thrive and reproduce. This is inevitably a difficult objective since the balance in numbers of antelope and livestock may be changed annually, but range flora changes only in long-time cycles. Therefore, the balance between the wild and domestic species and the range must be adjusted frequently by range and livestock management. The adjustment of the number of domestic animals to fit the carrying capacity of the range may be accomplished by changing management and marketing practices …
The Reduction Of P-Tolyl Methyl Ether., Gustav Paul Dinga
The Reduction Of P-Tolyl Methyl Ether., Gustav Paul Dinga
Electronic Theses and Dissertations
No abstract provided.
Separation Of The Selenium Compounds In Seleniferous Plant Protein Hydrolysates By Paper Partition Chromatography, Arnold L. Smith
Separation Of The Selenium Compounds In Seleniferous Plant Protein Hydrolysates By Paper Partition Chromatography, Arnold L. Smith
Electronic Theses and Dissertations
In 1943 Franke reported that the protein of "allolied" or "toxic" wheat carried the toxicant, and Franke and Painter in 1935 reported that those "toxic" proteins contained selenium which was in organic combination in the protein. There has been much speculation regarding the possibility of selenium replacing sulfur in the amino acids cysteine and methionine. The toxicity of selenium in selenium analogs of these compounds is similar to that of selenium occurring naturally in proteins seleniferous cereals, which indicated that the selenium may be present in the proteins as the analogue of these sulfur amino acids.
Separation And Identification Of The 2,4-Dinitrophenylhydrazones Of The Oxidation Products Of Glycerol., Gwendolyn Parker Mcclure
Separation And Identification Of The 2,4-Dinitrophenylhydrazones Of The Oxidation Products Of Glycerol., Gwendolyn Parker Mcclure
Electronic Theses and Dissertations
No abstract provided.
Microchemical Identification Of Amidone., Robert C. Watson
Microchemical Identification Of Amidone., Robert C. Watson
Electronic Theses and Dissertations
No abstract provided.
Some Reactions Of Chloro-Cyclo-Hexanone And Its Derivatives And The Synthesis Of 1 Chloro-2 Methyl Cyclo Hexene., Elle Bolt
Electronic Theses and Dissertations
No abstract provided.
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Crude Oil Salts In Petroleum Refining., Thomas Porter Bailey 1914-2001
Electronic Theses and Dissertations
No abstract provided.
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
A Study Of The Synthesis Of 4-Chlorobutanal., Carl E. Moore 1915-2012
Electronic Theses and Dissertations
No abstract provided.
Thermochemical Studies Of Special Propellants., Frederick C. Damm
Thermochemical Studies Of Special Propellants., Frederick C. Damm
Electronic Theses and Dissertations
No abstract provided.
Occupational Chemical Hazards In Industries Of Louisville And Jefferson County., Morgan Brown Lewman
Occupational Chemical Hazards In Industries Of Louisville And Jefferson County., Morgan Brown Lewman
Electronic Theses and Dissertations
The facts and conclusions presented in the following pages are the results of figures gathered during two and one half years of work as an Industrial Hygiene Engineer for the Louisville and Jefferson County Health Department. The factual information was acquired from many sources including extensive reading to which reference is made of the more recent publications in the bibliography and also from correspondence and discussions with authorities in various fields. Much data was gained from "in-service training" received at the United States Public Health Service; Bureau of Industrial Hygiene, Bethesda, Maryland; University of Michigan; National Conference of Governmental Industrial …
A Study Of Factors Influencing The Hydrolysis Of Corn Amylopectin By Barley Malt Enzymes., Thelma Munsey Back 1918-2006
A Study Of Factors Influencing The Hydrolysis Of Corn Amylopectin By Barley Malt Enzymes., Thelma Munsey Back 1918-2006
Electronic Theses and Dissertations
No abstract provided.
An Improved Method For The Determination Of Vitamin B₁ And Vitamin B₂ By Spectrophotometric Means., Kenneth W. Smith
An Improved Method For The Determination Of Vitamin B₁ And Vitamin B₂ By Spectrophotometric Means., Kenneth W. Smith
Electronic Theses and Dissertations
No abstract provided.
The Potentiometric Determination Of Zinc In Dowmetal Alloys., James S. Goodman
The Potentiometric Determination Of Zinc In Dowmetal Alloys., James S. Goodman
Electronic Theses and Dissertations
No abstract provided.
A Reorganization In The Continuity Of Subject Matter In Mathematics, Beryl E. Warner
A Reorganization In The Continuity Of Subject Matter In Mathematics, Beryl E. Warner
Electronic Theses and Dissertations
This thesis considers a reorganization in the order of arrangement of certain topics in elementary and undergraduate mathematics; i.e. , arithmetic, algebra, plane geometry, solid geometry, trigonometry, analytic geometry, and calculus. Two terms important in the discussion are reorganization, the process of changing the relative position of topics or proofs in mathematics to an earlier or later place in the development of subject matter, and continuity, the logical order of topics arranged according to the need of one to explain the other.
The purpose of the thesis is two-fold; First, to show what arrangement of topics may be desirable; and, …
A Study Of Fermat's Last Theorem., Jerome L. Krumpelman
A Study Of Fermat's Last Theorem., Jerome L. Krumpelman
Electronic Theses and Dissertations
This work is intended primarily for the student of mathematics who may not necessarily wish to delve into the complete theory of the problem. but who may wish to get a picture of the work necessary to study and understand it. For a complete history of the problem until 1919, refer to Chapter XXVI of Dickson's History of the Theory of Numbers, II, and for the work primarily connected with Irregular Cyclotomic Fields and Fermat's Last Theorem through part of 1927, refer to Algebraic Numbers, II, National Research Council Bulletin, # 62. For a Short presentation of the problem refer …
A Study Of The True Fermentable Substances In Grain And The Development Of A Rapid Method For The Determination Of Pentosans., Marjorie M. Laning 1916-2010
A Study Of The True Fermentable Substances In Grain And The Development Of A Rapid Method For The Determination Of Pentosans., Marjorie M. Laning 1916-2010
Electronic Theses and Dissertations
No abstract provided.
The Relative Influence Of Raw Material Components Upon The Thermal Expansion Of Vitreous Enamel., Robert C. Boyd
The Relative Influence Of Raw Material Components Upon The Thermal Expansion Of Vitreous Enamel., Robert C. Boyd
Electronic Theses and Dissertations
No abstract provided.
A Study Of The Kjeldahl Method And A Modification For The Determination Of Nitrogen In Alcoholic Distillates., Margie M. Miller
A Study Of The Kjeldahl Method And A Modification For The Determination Of Nitrogen In Alcoholic Distillates., Margie M. Miller
Electronic Theses and Dissertations
No abstract provided.
Oxidation Potentials Of Ferric Ammonium Citrate., Daniel P. Knopf 1916-1991
Oxidation Potentials Of Ferric Ammonium Citrate., Daniel P. Knopf 1916-1991
Electronic Theses and Dissertations
No abstract provided.
Chemical Substitutes., Clarence Elmore Parks 1909-1987
Chemical Substitutes., Clarence Elmore Parks 1909-1987
Electronic Theses and Dissertations
No abstract provided.