Life Sciences Commons^™

The Factors Affecting The Method Of Branching In Ailanthus Glandulosa., Emory W. Theiss

Electronic Theses and Dissertations

No abstract provided.

The Organic Acid Content Of Normal And Pathological Blood By The Use Of The Quinhydrone Electrode., Letitia Green

Electronic Theses and Dissertations

No abstract provided.

A Key To Differentiate Nymphal Stages Of Melanoplus Differentialis (Thomas) From Those Of Melanoplus Bivittatus (Say), (Orthoptera); Also, Descriptions Of Instars And A Key For Identification Of Nymphal Stages Of These Two Species, Gerald Bishop Spawn

Electronic Theses and Dissertations

During the past few years South Dakota and neighboring states have been confronted with serious outbreaks of locusts. Whole crops of small grain and corn have been destroyed by the voracious insect hordes which at times left only bare ground where once had stood waving fields of grain. Chief among the aggressors have been the two species, Melanoplus differentialis (Thomas), the Differential Locust, and Melanoplus bivittatus (Say), the Two-Striped Locust. The contents of this paper include studies of these two species.

Reliability And Adequacy Of South Dakota Farm Price Data, John Muehlbeier

Electronic Theses and Dissertations

The reliability and adequacy of South Dakota farm price data cannot be stated with any great degree of precision. The statistical measures of reliability in this analysis are based upon the conditions of simple sampling of which the conclusions cannot be stated in absolute terms but must be expressed in probability. The sampling as done by the Division of Crop and Livestock Estimates is known as weighted stratified sampling, a departure from simple sampling, but considered to result in greater representativeness. Recognizing the limitations of the measures in this study, certain conclusions can still be drawn concerning the reliability of …

The Influence Of Feed And Sunshine On The Vitamin D Content Of Cow’S Milk, Ben L. Robinson

Electronic Theses and Dissertations

For the past several years there has been a growing tendency among dairymen, particularity those located near the large cities, to keep their cows in the barn much of the time. Under such a system of management the cows receive but little direct sunshine. In some localities it is also possible to find many cows which are fed the year around on dry feed receiving very little, if any, green food, either as soiling crops or as pasture. From many standpoints such practices are, of course, necessary and desirable, but from the standpoint of the nutritional value of the milk …

The Latex System In The Root Of Taraxacum Officinale, Eleanor Kelton Evenson

Electronic Theses and Dissertations

In 1930 Mr. Emil Madsen of this laboratory began some experimental work upon the roots of dandelions, for the purpose of determining the means by which a dandelion root, which has been cut off below the surface of the ground, regenerates new shoots. He found that such roots form adventitious buds in exposed pericycle and secondary phloem. Several such buds may be formed in a single root. They grow and appear above the ground as leafy shoot.

Autobiography Of Proteins In Nutrients, Marguerite Jones

Electronic Theses and Dissertations

This thesis, submitted to Xavier University in 1933, surveys the chemical classification of proteins and their role in human nutrition, with the stated aim of preparing home economics students to understand protein's function in the diet. Jones organizes proteins into three major classes: simple proteins, including albumins, globulins, glutelins, protamins, and histones; conjugated proteins, including nucleo-proteins, glyco-proteins, phospho-proteins, and hemoglobins; and derived proteins, including albumoses, peptones, and peptids, describing the chemical composition, solubility properties, and sources of each.

The thesis then examines amino acids as the end products of protein digestion, identifying those essential for growth and maintenance, including tryptophane, …

The Development Of The Floral Organs Of Glycyrrhiza Lepidota, Richard L. Matteson

Electronic Theses and Dissertations

This is the first of a proposed series of papers, coming from the Botanical Laboratory of South Dakota State College, on the developmental anatomy of the prairie legumes. The recorded investigations of the legumes deal mostly with the cultivated species, and the greater part of this work considers the taxonomy and cytology of flowers. These papers proposed above deal with the floral development and the floral vascular anatomy of this family.

The Morphology Of The Seminal Vesicles, Accessory Glands, And The Ejaculatory Canal Of Melanoplus Differentialis (Thomas) And An External Morphological And A Histological Study Of The Seminal Vesicles, Accessory Glands, And Ejaculatory Canal Of This Grasshopper, Wilbur T. Reierson

Electronic Theses and Dissertations

The purpose of this thesis is to record the results of an investigation, by the writer, upon the reproductive system of Melanoplus differentialis (Thomas) with special emphasis placed upon the external morphology and the histological study of the seminal vesicles, accessory glands, and the ejaculatory duct; and also to record conclusions as to the probable function of these organs.

Some Effects Of A Constant Temperature And Different Relative Humidities Upon Egg Laying Of Melanoplus Bivittatus Scudder., Millard Jewell Hatten

Electronic Theses and Dissertations

Of the various species of grasshoppers occurring in rather extensive numbers year after year in the northwestern plains states, Melanoplus bivittatus is one of the most prevalent and destructive. It was thought that a study of the influence of different temperatures and relative humidities upon the reproductive potential of this species might reveal some information and that this information might be of some value in an attempt to forecast the abundance of this grasshopper in years following others in which the factors of temperature and relative humidity were known.

Farm Mortgage Experience Of Life Insurance Companies Lending In South Dakota, Harry Allan Steele

Electronic Theses and Dissertations

Life insurance funds play an important part in supplying farm mortgage credit. This source of credit has increased rapidly during the last twenty years and is now one of the principal sources of farm mortgage loans in the United States. Because of the nature of the institution of life insurance, its investments should be conservative. It is with this view in mind that the state insurance laws are designed to regulate the investments of the life insurance companies. Investments of the well established life insurance companies have generally been made on a conservative basis.

Anatomical Study Of Water Shoots And Ordinary Twigs, Dorothea I. Bingham

Electronic Theses and Dissertations

Water shoots or long shoots are those which appear low on the trunks of trees, or about stumps of trees recently cut down. The ordinary twigs are those found at the ends of branches. Interest in the cooperative study of water shoots and ordinary shoots on trees was aroused by the very marked differences, even in a single years growth, in length and the diameter of two types. The former is greater in diameter , much longer, and with more nodes, longer internodes and longer leaves than the twigs which grew ordinarily at the ends of branches. The object of …

The Effect Of Sodium Chloride Upon The Fission Rate Within A Single Clone Of Paramecium Caudatum And The Heritability Of That Effect., Mary C. Adolph

Electronic Theses and Dissertations

No abstract provided.

The Alkaloids, Felix F. Barre

Electronic Theses and Dissertations

This thesis, presented for the degree of Bachelor of Science, provides a systematic chemical study of the alkaloids, a class of complex nitrogenous plant substances possessing basic properties. Barre opens by defining the alkaloids and surveying the various systems used to classify them, whether by natural versus artificial origin, chemical nucleus (pyridine, quinoline, or isoquinoline), volatility, or botanical family of origin, and outlines their general physical and chemical properties, including solubility, optical activity, and characteristic reactions with precipitating and color-test reagents.

The thesis details standard laboratory methods for the extraction and separation of alkaloids from plant material, including a step-by-step …

The Vitamin B Content Of Kale Greens., Virginia Lee Smith

Electronic Theses and Dissertations

No abstract provided.

The Effect Of Potassium-Iodide On The Embryological Development Of The Chick With Special Reference To The Growth Of The Long Bones., David M. Polot 1904-1978

Electronic Theses and Dissertations

No abstract provided.

Certain Cultural Characteristics Of Digitalis Pupurea, (Linne) With A Proposed Chemical Assay, Clark W, Eidsmoe

Electronic Theses and Dissertations

Since its introduction into modern medicine digitalis has occupied a very important position in our material medica. Its widespread use as a remedy in conditions of failing heart, and its effectiveness as a diuretic in certain dropsical conditions have gained for it a reputation which is equaled by few other drugs. The opinion of pharmacologiate and physicians as to its mode of action and its field of clinical usefulness has been revised a number of times, and there is much diversity of teaching as to its use in special ailments. Among some workers there is a tendency to restrict its …

Comparative Metabolism Of Several Calcareous Minerals In Poultry Feeding, John T. Tripp

Electronic Theses and Dissertations

In part one of this study it was found that chickens when given oyster shells, in addition to their regular diet, produced a greater number of eggs and eggs of greater shell strength than did the chickens that were given the other calcareous materials used in this experiment. Oyster shell was followed in the order of their effectiveness by clam shells, Black Hills limestone, Nenno chalk stone, and Wisconsin dolomitie limestone.

A General Discussion Of Trichinella Spiralis (Owen), An Investigation Of Infection Of The Brown Rat, And A Life History Study Of The Parasite In The White Rat, Carl A. Johnson

Electronic Theses and Dissertations

The purpose of this treatise is threefold: first, to present a general discussion of Trichinella spiralis,; second, to present the results of an investigation of infection with trichinae of 100 brown rats; and third, to present the results of infecting white rats under laboratory conditions.

Studies In The Life History Of The Croton Bug, Blatella Germanica (Linnaeus), Laurence Adams Carruth

Electronic Theses and Dissertations

The Croton bug, or German Roach as it is commonly called, has been widely known for centuries. In the past, a considerable amount of work was done in attempting to find methods of controlling this insect, but relatively little attention was given to a study of its morphology, time of development, or to the finer details of the life history. this lack of information is probably due, in part to the fact that there are several similar common species of roaches and also because the Croton bug has probably received less attention than the other roaches, at least from a …

The Effect Of A Varying Moisture Supply At Different Periods Of Growth On The Development, Yield And Quality Of Flax, William K. Soule

Electronic Theses and Dissertations

In the flaxseed producing section of the United States consisting of the states of North Dakota, South Dakota, and Minnesota and Montana, periods of drought frequently occur during some part of the growing season. The time of occurrence varies from early spring to fall. Such periods have a profound effect on the normal growth of the plant.

Greenhouse Studies On The Relationship Of Age Of Wheat Plants To Infection By Puccinia Graminis Tritici, George W. Eade

Electronic Theses and Dissertations

The resistance of wheat to the stem-rust organism (Puccinia graminis tritei) has been under investigation for a number of years. Although rust resistance has been investigated from various angles, there still remains a question as to the nature of resistance, the time when resistance first appears in plants and whether or not it is of a stable character. Peltier found that environmental conditions could change the degree and type of stem rust infection on wheat plants; Miss Hart proved that stomatal behavior was very important in the rust resistance, and Harrington and Aamodt studied the inheritance of rust resistance and …

The Natural Factors In The Selection Of Diet., Lamar William Neblett

Electronic Theses and Dissertations

No abstract provided.

A Study Of The Farm Shop Curriculum, Robert B. Fall

Electronic Theses and Dissertations

The building of a course to teach the principles underlying mechanical operations on farms has been and still is under criticism, and probably will continue to be for some time to come; but it is such an important brench, or part, of farming that was thought that any contribution which could be made to assist in a better understanding of the problem would be worth while, hence this study.

The Anatomy Of The Germinating Bulbil Of Lilium Tigrinum, Katherine Harris Tripp

Electronic Theses and Dissertations

Apparently very little, if any, anatomical investigation has been made of the bulbil of Lilium tigrinum, though it has often been used as a propagating organ and consequently, the problem suggested attractive possibilities in an almost virgin field of investigation. Collections were made from five different plants beginning Sept. 27, 1928 until July 22, 1929. The older bulbils were removed from the axils of the foliage leaves and fixed in formalin acetic alcohol. They were gradually dehydrated by treatment with alcohol increasing the percentage 10% from 50 up to 100%. Xylol treatment in increasing percentages was then resorted to, until …

Abortive Stamens And Carpels In Lychnis Alba, Gus B. Ulvin

Electronic Theses and Dissertations

Botanists have long been interested in the manner of "sex expression" in plants. Some plant shave perfect flowers, that is, both sexes are expressed in a single flower, with no variation from this condition within the species. Other plants have flowers in which only one or the other sex is expressed, while still other plants occur in which "pure staminate or pure carpellate and all intermediate degrees" occur.

The Effect Of Ultra-Violet And Infra-Red Rays Upon The Fission Rate Within A Single Clone Of Paramecium Caudatum And The Heritability Of That Effect., L. Sebastian Rose

Electronic Theses and Dissertations

Light in its various phases exerts a marked influence on the functional as well as the physical structure of all living matter. The phenomena of light involves two theories: (1) the wave or electro-magnetic theory conceiving light as consisting of electric emanations or waves of various frequencies and intensities given off from many substances. (The principle source of light as thus conceived is the sun with its estimated temperature of 10,000 F.); (2) the quantum theory which conceives light as a factor involved in ionization in chemical reactions (negative electrons are ejected from a surface of metallic iron when a …

The Morphology, Life History, And Control Of Some Common Species Of Oniscoidea Found In South Dakota, M. T. Fredricksen

Electronic Theses and Dissertations

Since practically no work has been done upon the life history and development of the common pill bugs or sow bugs, it is the aim of this paper to record the investigations of the life history and development as carried on by the author. The morphology was added in order to give the reader a definite idea of the organization and structure of these species.

The Effect Of Treatment With Ethylene Chlorhydrin Upon The Respiration Of Sweet Potatoes (Ipomea Batatas), Leon J. Tyler

Electronic Theses and Dissertations

1. Treatment with ethylene chlorhydrin produced marked results in the respiration of four of five varieties of sweet potatoes tried.
2. Not all varieties of sweet potatoes respond alike to the same treatment. Porto Rico variety of sweet potatoes did not respond to the treatment.
3. There was a considerable difference in the amount of CO₂ respired by different varieties.
4. The need for further research here with respect to the specific effect of chemicals upon the cell system becomes apparent and again emphasizes the importance of Biochemistry.
5. There was possibly an accelerative effect on sprouting due to increased respiratory processes brought about …

A Contribution On The Staminate Flower Of Cucumis Sativus, Kenneth W. Simons

Electronic Theses and Dissertations

In Heimlich’s recent paper (2) on the staminate flower of Cucumis sativus, the conclusion was reached that the tetrasporangiate stamen was complete while the bisporangiate stamen was only half complete. In Miller’s more recent investigation of Schinocystis lobata (4), the bisporangiate stamen was shown to be complete and the tetrasporangiate stamen double. These opposing points of view suggest the advisability of further investigation in the Cucurbitaceae. Since Heimlich described two separate apical prolongations on each tetrasporangiate stamen and only one on the bisporangiate stamen, it seemed to the present writer that these prolongations might indicate the double and single natures …