Life Sciences Commons^™

The Study Of The Effects Of Paradichlorbenzene On Drosophila Melanogaster, Dwain J. Paal

Bachelors’ Theses

The object of this investigation was to produce polyploid cells in the salivary glands of Drosophila melanogaster by treatment with paradichlorbenzene. Polyploidy is the condition in which the number of chromosomes in the nucleus is an exact multiple of the somatic or diploid number greater than two. This phenomena has often been referred to as produced by incomplete nuclear division.

The Influence Of Dowicide A On Drosophila Melanogaster, Helen Mary Dore

Bachelors’ Theses

Drosophila melanogaster plays a far greater part in science than man at first realizes. A study of their heredity makes it possible to develop laws of human here­dity and with this knowledge, thus provide for the better­ment of mankind. Considerations which lead to the choice of the fruit fly, Drosophila melanogaster, in experimentation are briefly the following: (a) its small size which makes, it convenient to keep; (b) its short life cycle; and (c) the ease with which it can be cultivated. Since fruit flies are so important to science, it follows that it is also important that a …

Survey Of Farmer Transportation Facilities, Needs And Uses, W.P. Cotton, Norris J. Anderson

Agricultural Experiment Station Agricultural Economics Pamphlets (1941-1991)

A statewide study of transportation facilities, needs and uses was begun in South Dakota, July 1, 1941, The study was initiated primarily because of the shortage of rubber and the threat of a nation-wide transportation shortage. Although the rubber situation seems to be easing somewhat, it is still very apparent that our transportation facilities must be conserved to the utmost in order to maintain our transportation system for the promotion of the war effort. Three phases of the transportation study which is being carried on in South Dakota, have previously been completed: namely, (1) the survey of creamery, produce, and …

Growth Seed Yields, And Seedling Production Of Native Prairie Plants In Various Habitats Of The Mixed Prairie, H. Ray Brown

Master's Theses or Doctor of Nursing Practice

The native vegetation of the mixed prairie of west-central Kansas was subjected to the worst drought on record during the period 1933 to 1939 inclusive. Data secured from the United States Weather Bureau reveal the fact that precipitation during this period of drought was far below normal . The rainfall deficit as reported by Albertson and Weaver (1942) was nearly 35 inches for this 7-year period. Other climatic factors such as wind movement, relative humidity, and temperature were equally abnormal. The extreme drought period greatly modified the vegetation of the mixed prairie and the short-grass disclimax. The basal cover in …

Night Vision, Charles Sheard

Journal of the Minnesota Academy of Science

No abstract provided.

Processing Of Fats And Oils, J. Jakobsen

Journal of the Minnesota Academy of Science

No abstract provided.

Minnesota Species Of Aleurodiscus, Harvey E. Stork

Journal of the Minnesota Academy of Science

No abstract provided.

The Degree Of Extramedial Response To Hybridity In The Growth Rates Of Plant And Ear In A Series Of Hybrids In Maize, Ernst C. Abbe, Kwei-Wu Wang

Journal of the Minnesota Academy of Science

No abstract provided.

The Degree Of Extramedial Response To Hybridity In The Growth Of The Mesocotyl And Coleoptile In A Series Of Hybrids In Maize, Bernard Phinney, Ernst C. Abbe

Journal of the Minnesota Academy of Science

No abstract provided.

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.

North And South Dakota Horticulture, April-May 1943, North And South Dakota State Horticultural Societies

North and South Dakota Horticulture

Volume 16, Number 4 and 5

Audubon in the Dakotas, O.A. Stevens
Newslants, H.A. Graves
Manitoba News Letter, W.R. Leslie
Garden Notes, W.E.H. Porter
Bridge Grafting, H.R. Woodward
Garden Club Gleanings, Mrs. G.M. Jorgensen
Fruit & Vegetable Notes, F.X. Wallner
Book Reviews, Mrs. F. Briley
Secretary's Corner, W.A. Simmons
Horticultural Notes, Claude A. Barr
Hardiness, F.L. Skinner

Kentucky Warbler (Vol. 19, No. 2), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.

Conception Rate In Dairy Cattle By Artificial Insemination At Various Stages Of Estrus, George W. Trimberger, H. P. Davis

Nebraska Agricultural Experiment Station: Historical Research Bulletins

A breeding experiment with 295 dairy cows and heifers of the Jersey, Guernsey, Ayrshire, and Holstein breeds was conducted in the University of Nebraska dairy herd. The females were given artificial services at various stages of estrus to determine the effect of time of service upon conception. The results obtained indicate the potential benefits in higher percentage of conception in females bred during the middle of estrus, toward the end of estrus, and those bred in full heat and rebred in 24 hours. The latter is usually not very practical, especially in artificial breeding rings, but there are occasions when …

Nutrition In The Emergency, G. O. Burr

Journal of the Minnesota Academy of Science

No abstract provided.

A Preliminary Survey Of Insects Visiting Goldenrod In Itasca Park, Alice Endicott

Journal of the Minnesota Academy of Science

No abstract provided.

Preliminary Report On Subtratum Temperature Studies On Root Growth, Stanley W. Oexemann

Journal of the Minnesota Academy of Science

No abstract provided.

Structure And Growth Of The Mesocotyl In The Mutant Of Maize, Dwarf-1, Agnes Hansen, Ernst C. Abbe

Journal of the Minnesota Academy of Science

No abstract provided.

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.

Back Matter

Journal of the Minnesota Academy of Science

No abstract provided.

The Biological Effect Of An Invisible Radiation On The Drosophila Melanogaster, Leo C. Massopust Jr.

Bachelors’ Theses

In a series of investigations, Massopust describes various effects he obtained with an invisible radiation which he called infra-red. The results he obtained seemed to indicate that this radiation might have some effect on development and growth. Hence, the Drosophila Melanogaster was chosen for experimentation to ascertain whether or not the invisible radiation he used would produce mutations. Personal communications from this author disclosed that up to the present writing he has not been able to establish definitely that the radiation lies somewhere in the infra-red band of the electro-magnetic field. He does, however, favor the interpretation that it is …

First Report Of The Committee On Grasshopper Research Appointed By The American Association Of Economic Entomologists, Agricultural Experiment Station, South Dakota State College

Agricultural Experiment Station Entomology Pamphlets (1940-1952)

This is the first report of the Committee on Grasshopper Research which was authorized at the San Francisco meeting of the American Association of Economic Entomologists in 1942.

The Foundation Of Permanent Agriculture In Arid Regions, Orson W. Israelsen

Faculty Honor Lectures

The engineer, like other scientists, is continuously seeking knowledge and understanding of the universe in which he lives. He is vitally interested in the control and the use of the forces and materials of nature for the benefit of man. He strives for the maximum economy in the use of these forces and materials which is consistent with safety and durability. He abhors waste and he works vigorously to increase efficiency. To the engineer, mastery of the physical obstacles of life is not only a challenge-it is also an opportunity. He knows that full understanding of the physical sciences is …

Bulletin No. 303 - Utilization Of Irrigable Land In The Reservation Area Of Uinta Basin, Utah, George T. Blanch, Clyde E. Stewart

UAES Bulletins

Several years ago the Utah Agricultural Experiment Station began a project entitled "Study of agricultural resources in Utah and their utilization." This project contemplates conducting detailed soils, irrigation water, range and economic studies in all areas of Utah. To date these studies have been made for a portion of the state including the Uinta Basin. However, in order that the information so obtained can be more effectively used for public and private programs of operation, there is a need to combine and correlate the basic data.

The primary objective of the study reported herewith is to bring together and analyze …

Bulletin No. 307 - Skin Folds In Sheep, Milton A. Madsen, Alma C. Esplin, Ralph W. Phillips

UAES Bulletins

Sheep vary greatly, even within breeds, in the number and size of folds in the skin. At one time producers were emphasizing the importance of having a large number of skin folds in fine wool sheep such as the Merino and Rambouillet. This was based on the belief that skin folds were associated with high yields of grease wool and fineness of wool fibers. In recent years the trend has been toward a smoother bodied sheep with longer staple and less grease in the fleece.

The objects of this bulletin are to present a review of the available information concerning …

North And South Dakota Horticulture, March 1943, North And South Dakota State Horticultural Societies

North and South Dakota Horticulture

Volume 16, Number 3

The Bluebird, O.A. Stevens
Newslants, H.A. Graves
Manitoba News Letter, W.R. Leslie
Garden Notes, W.E.H. Porter
History of Arbor Day, H.R. Woodward
Garden Club Gleanings, Mrs. G.M. Jorgensen
Fruit & Vegetable Notes, F.X. Wallner
Beebe's Philosophy, H.E. Beebe
Secretary's Corner, W.A. Simmons
Questions & Answers, S.A. McCrory
Premium List

North And South Dakota Horticulture, February 1943, North And South Dakota State Horticultural Societies

North and South Dakota Horticulture

Volume 16, Number 2

The Bald Eagle, O.A. Stevens
Newslants, H.A. Graves
Manitoba News Letter, W.R. Leslie
Garden Notes, W.E.H. Porter
Buffalo Grass, H.R. Woodward
Beebe's Philosophy, H.E. Beebe
Garden Club Gleanings, Mrs. G.M. Jorgensen
Fruit & Vegetable Notes, F.X. Wallner
Secretary's Corner, W.A. Simmons
Questions & Answers, S.A. McCrory
Book Reviews, Mrs. F. Briley

Cockroach Control, H. D. Tate, E. C. Klostermeyer

Nebraska Agricultural Experiment Station: Historical Circulars

Cockroaches are among the most annoying and objectionable of household pests. They are a menace to sanitation, and their filthy habits result in the destruction and pollution of food. Not only may they become numerous in homes, but also in restaurants, hotels, grocery stores, dairies and other places where food is prepared or stored. Since they are active mostly at night, large numbers may develop in a building before they are known to exist.

Tillage Methods In Grasshopper Control, Gerald B. Spawn

Agricultural Experiment Station Entomology Pamphlets (1940-1952)

The eyes of the world are turned toward the American farmer as the individual to whom they must look for the production of a plentiful supply of food for our fighting forces, our Allies and for the hungry millions as they are liberated from Nazi rule and devastation. Grasshoppers have done much to defeat the Great Plains farmers in their effort to produce this food. In the central part of our State many fields of corn, badly needed for feed, were planted during the past year from which not one bushel of grain was harvested. Numerous fields of flax, very …

Regeneration Experiments With Planaria Maculata, Leon North

Biology Honors Papers

This 16 page thesis describes experiments conducted on planaria to determine the effect of vitamin B solution on the rate of regeneration.

The Preparation Of Corrosion Specimens, Llewellyn W. Hunsicker

Biology Honors Papers

This 11 page thesis describes the technique involved in making a Wood's metal cast of the lungs as well as the preparation of a vinylite corrosion specimen of the vascular system of a cat.