Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Life Sciences

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 158161 - 158190 of 159291

Full-Text Articles in Entire DC Network

An Analytic Comparative Study Of Certain Biology Textbooks Used At Secondary School Level, Joseph E. Rankin Jul 1947

An Analytic Comparative Study Of Certain Biology Textbooks Used At Secondary School Level, Joseph E. Rankin

Master's Theses or Doctor of Nursing Practice

Biology is the science of life and therefore deserves every consideration in the high school curriculum. The world today is making an extensive and intelligent use of biology in solving problems of personal and social significance. Scientists have discovered that certain phases of the subject are more important to man's welfare than others. For this reason it is essential that biology be presented to our high school students not as isolated facts, but in relation to the problem of living. Through this science of living things, the student can gain a healthy respect for facts and for conclusions based on …


Comparison Of Biotic Communities Of The Cedar-Hemlock And Oak-Hickory Associations, Final Version, Jane Claire Dirks-Edmunds Jul 1947

Comparison Of Biotic Communities Of The Cedar-Hemlock And Oak-Hickory Associations, Final Version, Jane Claire Dirks-Edmunds

Jane Claire Dirks-Edmunds Documents

A revised version of the final draft of Dr. Jane Claire Dirks-Edmunds's doctoral dissertation was published in Ecological Monographs in 1947. In her dissertation, Dirks-Edmunds compared the Douglas fir forest community on Saddleback Mountain in Oregon to an oak-hickory community in Illinois. Dirks-Edmunds, a 1937 graduate of Linfield College, graduated from the University of Illinois in 1941; she returned to teach in the Biology department at Linfield from 1941-1974.


Nebraska Bird Review (July-December 1947) 15(2), Whole Issue Jul 1947

Nebraska Bird Review (July-December 1947) 15(2), Whole Issue

Nebraska Bird Review

Contents

Bird Departure Dates .........Wilson Tout 1

Recent Changes in Nomenclature and Subspecific Status of Nebraska Birds .........F.W. Haecker 5

"Drumming" in the Chimney Swift .........W.E. Eigsti 9

Banding Mourning Doves in Eastern Nebraska.........Wilhelmina and Leroy Gulotta 12

Hawk Populations in Nebraska......... John H. Wampole 20

Winter Birds of the Fontenelle Forest......... Charles A. Stewart 24

Notes on the Nesting of the Acadian and Alder Flycatchers......... Frank H. Shoemaker ......... 31

N.O.U. Cooperative Bird Migration and Occurrence List for First Half of 1947......... 36

General Notes......... 40

Nebraska Bird Club News......... Adrian C. Fox......... 55

Announcements......... 60

News and Comment......... …


Medical Arts & Sciences, Volume 1, Number 2, July 1947 Jul 1947

Medical Arts & Sciences, Volume 1, Number 2, July 1947

Medical Arts and Sciences: A Scientific Journal of the College of Medical Evangelists

No abstract provided.


Cerebral Anoxia And Its Residuals: Pt. Ii. Respiration, Normal And Pathological, Cyril B. Courville Jul 1947

Cerebral Anoxia And Its Residuals: Pt. Ii. Respiration, Normal And Pathological, Cyril B. Courville

Medical Arts and Sciences: A Scientific Journal of the College of Medical Evangelists

No abstract provided.


Riboflavin Production By Molds, George L. Peltier, Raymond Borchers Jul 1947

Riboflavin Production By Molds, George L. Peltier, Raymond Borchers

Papers in Microbiology

Very little information is at hand regarding the ability of molds to synthesize riboflavin. Few citations pertaining directly to riboflavin production by true molds are available.2 Pontovich (1943) found as much as 2 mg riboflavin per g of Aspergillus flavus mycelium. Tanner et at. (1945) determined the quantity of riboflavin in the submerged fermentation media of Penicillium chrysogenum. The highest value found was 1. 36 mg per ml. The primary purpose of this study was to screen several hundred isolates, recently obtained from soil, crop residues, and composts, for their ability to produce riboflavin on a wheat bran substrate.


Chincoteague: A National Wildlife Refuge, Rachel Carson Jun 1947

Chincoteague: A National Wildlife Refuge, Rachel Carson

United States Fish and Wildlife Service: Publications

The national wildlife refuge at Chincoteague, Virginia, is one of the newest in a chain of sanctuaries placed along the flight lanes of the waterfowl. Coming down from the north the principal links of the chain are Parker River, Montezuma, Susquehanna, Brigantine, and Bombay Hook. Then from Chincoteague the links run south, through Back Bay and Pea Island, Mattamuskeet and Cape Romain. Chincoteague, like other waterfowl refuges, is needed because birds migrate, and because in so doing they expose themselves to great dangers.

The migration of birds is one of the ancient spectacles of earth, and one of the most …


Parker River: A National Wildlife Refuge, Rachel Carson Jun 1947

Parker River: A National Wildlife Refuge, Rachel Carson

United States Fish and Wildlife Service: Publications

The Parker River National Wildlife Refuge is New England's most important contribution to the national effort to save the waterfowl of North America. Many million Americans have a direct stake in the success of this effort: the 2,000,00o waterfowl hunters, the millions who find recreation and esthetic pleasure in observing and photographing the birds, and all those, whom there is no way of counting, who understand the value of preserving wildlife as part of America's natural heritage.

During the several generations in which the United States has been converted from a land preeminently wild and unsettled into an industrial and …


The Density Of Matter, John D. Boon Jun 1947

The Density Of Matter, John D. Boon

Field and Laboratory

Density is the amount of matter in a unit volume of space. In this paper it will be expressed in grams per cubic centimeter. As a rule we think of density as being applicable to the things we deal with in everyday life, forgetting that it is an important characteristic of matter, from atomic nucleus to the stellar universe. To a great extent the behavior of matter may be explained by a knowledge of density.


Brief Short-Title List Of Published Works On The History Of Science, Samuel W. Geiser, Bessie T. Geiser Jun 1947

Brief Short-Title List Of Published Works On The History Of Science, Samuel W. Geiser, Bessie T. Geiser

Field and Laboratory

The present brief list was compiled primarily for the use of students in a course on the History of Science offered by the senior author at Southern Methodist University. It is far from complete: scholars conversant with the field will note omission of works they consider of primary importance, and the inclusion of others, to them of secondary interest. We are not sure that in every case our omissions and inclusions are fully defensible; but it is believed that this bibliography includes a very large proportion of the best works on the subject in hand.


Life History Studies Of The Mouse, Peromyscus Truei Nevadensis, Lowell S. Miller Jun 1947

Life History Studies Of The Mouse, Peromyscus Truei Nevadensis, Lowell S. Miller

Theses and Dissertations

Peromyscus truel's a fairly common inhabitant of the upper sonaranlife zone of the Western States. It is an excellent laboratory anlmal with the limitation that captivity must be accompanied by forced activlty, in order to keep the animals within the limits of normal activity. This mouse is polyestrous and breeds from early spring to late fall. Observations have shown pregnancy in late September and in early February. It is the writer's belief that ovulation in the ovary occurs only when copulation has taken lace, because corpora lutea has only been found in pregnant or lactating females. The evidence is scanty …


Hormones Of The Vertebrates And Their Influence On The Growth And Development Of Invertebrates, M. G. Heckman May 1947

Hormones Of The Vertebrates And Their Influence On The Growth And Development Of Invertebrates, M. G. Heckman

Biology Honors Papers

This 14 page thesis discusses the nature of the hormone thyroxine, the structure and physiological behavior of paramecium and describes an experiment on the effect of vertebrate hormones with various invertebrates.


Study Of Viable Seeds In Surface Soil From Various Habitats In Ellis County, Kansas, Robert D. Lippert May 1947

Study Of Viable Seeds In Surface Soil From Various Habitats In Ellis County, Kansas, Robert D. Lippert

Master's Theses or Doctor of Nursing Practice

It is the purpose of this study to determine what species of plants emerge from samples of surface soil taken from various habitats after several years of favorable growing conditions.


Pastures Of Western Kansas In Relation To Intensity Of Utilization In Past Years, Gerald W. Tomanek May 1947

Pastures Of Western Kansas In Relation To Intensity Of Utilization In Past Years, Gerald W. Tomanek

Master's Theses or Doctor of Nursing Practice

Short grass pastures vary in their ability to produce forage for livestock consumption. One of the reasons for this difference is a variation in the degree of utilization in past years. Forage production of short grass ranges has been reduced to about one-half after only a few decades of improper grazing; therefore the problem of proper utilization is becoming more important every year (Forest Service, 1936). When the settlers first came to western Kansas they found an almost complete cover of native vegetation and during the first few years only a small portion of the range land was cultivated. With …


Aspen Properties And Uses, Zigmond A. Zasada May 1947

Aspen Properties And Uses, Zigmond A. Zasada

Aspen Bibliography

Because of the large demand for lumber during the last 10 years, and particularly during the war period, aspen has entered many new fields of use. At present there is widespread interest in the possibilities of building new industries and extending the life of old ones by increased use of aspen. Many people are interested in becoming familiar with this wood. This report has been prepared to give general information on the properties and present uses of aspen and also to help in correcting some of the existing erroneous ideas about this wood.


An Adaptation Of The Feulgen Reaction For The Staining Of The Salivary Gland Chromosomes Of Drosophila, Herman C. Inlow May 1947

An Adaptation Of The Feulgen Reaction For The Staining Of The Salivary Gland Chromosomes Of Drosophila, Herman C. Inlow

Bachelors’ Theses

The discovering of the genetic value of Drosophila salivary gland chromosomes by Painter, Heitz, and Bauer in 1934 posed a problem of technique to the microtomist that is still being improved upon and widened. The staining of these chromosomes fer better study and to determine their properties, both chemical and physical, has been the object of intense research. This paper is the result of my work in connection with this subject.


A Taxonomic Study Of The Adult Mosquitoes Of Utah County With Notes On The Biology And Distribution Of The More Common Species 1946-1947, Cluff E. Hopla May 1947

A Taxonomic Study Of The Adult Mosquitoes Of Utah County With Notes On The Biology And Distribution Of The More Common Species 1946-1947, Cluff E. Hopla

Theses and Dissertations

In Utah County, information has been lacking concerning the taxonomy and distribution of mosquitoes. With the knowledge of this condition, it is felt that information can be presented which will be of value both to the scienoe of Entomology and the area concerned.


A Study Of A Heron Nesting Colony, Linden J. Leatham May 1947

A Study Of A Heron Nesting Colony, Linden J. Leatham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Herons are well known because of their gregarious nesting habits. Like many others of the lower orders of birds they nest together in pure or mixed colonies of many different combinations and under diverse living conditions. The population of different colonies may vary from a few pairs to many thousands of pairs depending upon the nature and extent of the breeding area, the food supply available and the protection afforded either by natural or artificial means.

In Utah and adjacent areas of bordering states, many types of heron associations have been studied and reported by ornithological workers. Breeding colonies of …


A Taxonomic Study Of The Scolytidae (Coleoptera) Of The Logan Canyon Area Of Utah, Stephen L. Wood May 1947

A Taxonomic Study Of The Scolytidae (Coleoptera) Of The Logan Canyon Area Of Utah, Stephen L. Wood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In spite of the great economic importance of north American Scolytidae, many taxonomic descriptions remain inadequate for the identification of species, and existing keys have been made obsolete by the recent description of new species. To bring these keys up to date and make them useful to students and practical foresters, detailed studies of the morphological structure of the various species are necessary. The purpose of the present investigation has been to clarify and revise existing keys and to describe briefly the species of Scolytidae occurring in the Logan Canyon area of Utah. The following keys and descriptions will be …


The Fifty-Ninth Session Of The Iowa Academy Of Science And The Fourteenth Convention Of The Junior Academy Of Science Of Iowa, April 18 And 19, 1947, Iowa Academy Of Science Apr 1947

The Fifty-Ninth Session Of The Iowa Academy Of Science And The Fourteenth Convention Of The Junior Academy Of Science Of Iowa, April 18 And 19, 1947, Iowa Academy Of Science

Iowa Academy of Science Documents

No abstract provided.


Abstract Papers Apr 1947

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.


Kentucky Warbler (Vol. 23, No. 2), Kentucky Library Research Collections Apr 1947

Kentucky Warbler (Vol. 23, No. 2), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.


The Circulatory Effects Of Histamine, Fred B. Moor Apr 1947

The Circulatory Effects Of Histamine, Fred B. Moor

Medical Arts and Sciences: A Scientific Journal of the College of Medical Evangelists

No abstract provided.


Trout Foods In Gilmore Valley Creek, Winona County, Minnesota, L. George Apr 1947

Trout Foods In Gilmore Valley Creek, Winona County, Minnesota, L. George

Journal of the Minnesota Academy of Science

No abstract provided.


Back Matter Apr 1947

Back Matter

Journal of the Minnesota Academy of Science

No abstract provided.


Objectivity In Biology, Cyril E. Abbott Jan 1947

Objectivity In Biology, Cyril E. Abbott

Journal of the Arkansas Academy of Science

No abstract provided.


Bulletin No. 327 - Utah Agricultural Experiment Station Biennial Report, 1944-1946, R. H. Walker Jan 1947

Bulletin No. 327 - Utah Agricultural Experiment Station Biennial Report, 1944-1946, R. H. Walker

UAES Bulletins

During the past biennium there has been a general expansion in the research program of the Utah Agricultural Experiment Station. Although some of the investigations were curtailed by lack of personnel and equipment and the pressure of wartime assignments, many of the staff were able to devote more time to research because of a lessening of the teaching load at the College. The emergency caused a re-examination of the research program, old projects, no longer urgent were weeded out, others were revised to meet the needs of the changing times, and many new projects were initiated to extend the research …


Kentucky Warbler (Vol. 23, No. 1), Kentucky Library Research Collections Jan 1947

Kentucky Warbler (Vol. 23, No. 1), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.


The Phorid Flies Of Guam, George E. Bohart Jan 1947

The Phorid Flies Of Guam, George E. Bohart

All PIRU Publications

No abstract provided.


An Arsenic Survey In Utah, George F. Knowlton, L. W. Jones, William P. Nye Jan 1947

An Arsenic Survey In Utah, George F. Knowlton, L. W. Jones, William P. Nye

All PIRU Publications

No abstract provided.