Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Education (15477)
- Arts and Humanities (6838)
- Higher Education (5891)
- Social and Behavioral Sciences (4361)
- Science and Mathematics Education (4046)
-
- Creative Writing (2244)
- Music (2127)
- Music Performance (1848)
- Physical Sciences and Mathematics (1726)
- Life Sciences (1547)
- English Language and Literature (1367)
- Curriculum and Instruction (1034)
- Educational Leadership (902)
- Medicine and Health Sciences (797)
- Anthropology (769)
- Library and Information Science (687)
- Educational Administration and Supervision (531)
- Public Affairs, Public Policy and Public Administration (491)
- Sociology (457)
- Psychology (452)
- Art and Design (448)
- Communication (440)
- Health and Physical Education (418)
- Language and Literacy Education (408)
- Engineering (376)
- Literature in English, North America (354)
- History (346)
- Geography (331)
- Poetry (325)
- Fiction (321)
- Keyword
-
- Concert program--Iowa--Cedar Falls; (1732)
- University of Northern Iowa. Faculty Senate; University of Northern Iowa--Faculty; (1280)
- Graduate Council (400)
- University of Northern Iowa; University of Northern Iowa Graduate College; (400)
- School--Iowa--Cedar Falls; (395)
-
- Iowa (301)
- School administrators--Attitudes; Teacher-administrator relationships; Student-administrator relationships; (242)
- Postville (216)
- University of Northern Iowa. International Students and Scholars Office--Periodicals; University of Northern Iowa--Foreign students--Periodicals; (214)
- German American newspapers--Iowa--Waverly; Newspapers--Iowa--Waverly; (174)
- University of Northern Iowa--Curricula; Schedules (174)
- American--Iowa--Cedar Falls; University of Northern Iowa; (164)
- University of Northern Iowa. Library--Periodicals; University of Northern Iowa--Students--Services for--Periodicals; College students--Services for--Iowa--Cedar Falls--Periodicals; (156)
- Commencement ceremonies--Iowa--Cedar Falls; University of Northern Iowa--Periodicals; (153)
- University of Northern Iowa--Periodicals; (152)
- Postville Immigration Raid (150)
- Iowa Waste Reduction Center--Periodicals; Waste minimization--Iowa--Periodicals; (141)
- Malcolm Price Laboratory School--Periodicals; (136)
- Iowa State Teachers College--Curricula; University of Northern Iowa--Curricula; Schedules (131)
- Iowa State Teachers College--Periodicals; University of Northern Iowa--Periodicals; (126)
- Commencement ceremonies--Iowa--Cedar Falls; Iowa State Teachers College--Periodicals; University of Northern Iowa--Periodicals; (122)
- University of Northern Iowa Secondary Teacher Education Senate; (121)
- UNI ScholarWorks--Statistics--Periodicals; (119)
- University of Northern Iowa Elementary Teacher Education Senate; (114)
- University of Northern Iowa. Office of International Engagement--Periodicals; University of Northern Iowa--Foreign students--Periodicals; (104)
- College verse (103)
- University of Northern Iowa. Faculty Senate; University of Northern Iowa--Faculty; (96)
- Geography--Study and teaching (Secondary); (88)
- University of Northern Iowa. Graduate College--Curricula; University of Northern Iowa--Graduate work; (84)
- Underground periodicals; (82)
- Publication Year
- Publication
-
- Proceedings of the Iowa Academy of Science (6507)
- Graduate Research Papers (4473)
- Dissertations and Theses @ UNI (2740)
- Iowa Science Teachers Journal (2308)
- Purple Pen (1874)
-
- Music Recital Programs (1759)
- Documents - Faculty Senate (1384)
- Iowa Journal of Communication (891)
- Honors Program Theses (859)
- Short Story (722)
- Journal of the Iowa Academy of Science: JIAS (702)
- Institute for Educational Leadership Monograph Series (566)
- Athletics Media Guides (471)
- Faculty Publications (415)
- Documents - Graduate Council (400)
- UNI Schedule of Classes (384)
- Postville Project Documents (363)
- Open Educational Resources (354)
- Midwest: A Literary Review (339)
- UNI Commencement Programs (326)
- Science Bulletin (319)
- Institutional Effectiveness & Planning Documents (309)
- The Alumnus (225)
- UNIversitas: Journal of Research, Scholarship, and Creative Activity (224)
- ISSO Weekly Newsletter (214)
- Iowa Academy of Science Documents (199)
- Draftings In (189)
- UNI Response to COVID-19 (179)
- Library Documents & Reports (entire collection) (175)
- Waverly Phoenix (174)
- Publication Type
- File Type
Articles 29071 - 29100 of 35976
Full-Text Articles in Entire DC Network
The Address Of The President: Old Wine In New Bottles, Joseph C. Gilman
The Address Of The President: Old Wine In New Bottles, Joseph C. Gilman
Proceedings of the Iowa Academy of Science
Fungi, such as mushrooms, plant pathogens, molds, and mildews have been known from the time man began to take an interest in his natural surroundings. The plant pathologists cite the Bible for their early records, and we know that mushrooms were a source of inspiration to ancient Roman architects in the adornment of buildings. Their sudden appearance in unexpected places gives them an aura of mystery that enfolds them like a mantle and lends interest to them even today. When we add to these attributes their great diversity of form and color, their beauty and their repulsiveness, their uses and …
In Memoriam: Charles Mclean Fraser; Raymond A. French; Frank E. Goodell; R. Monroe Mckenzie; W. M. Mclaughlin;, G. J. Spencer, W. B. Zuker, Dean C. Stroud, T. Russell Jenness, James M. Stewart
In Memoriam: Charles Mclean Fraser; Raymond A. French; Frank E. Goodell; R. Monroe Mckenzie; W. M. Mclaughlin;, G. J. Spencer, W. B. Zuker, Dean C. Stroud, T. Russell Jenness, James M. Stewart
Proceedings of the Iowa Academy of Science
No abstract provided.
Notes On The Grasses Of Southeastern Iowa, Robert G. Brown
Notes On The Grasses Of Southeastern Iowa, Robert G. Brown
Proceedings of the Iowa Academy of Science
In 1933, Cratty (6) listed the grasses of Iowa, represented by specimens in the Iowa State College herbarium, in his paper "THE IOWA FLORA." Twenty-eight years earlier, Pammell, Ball and Lamson-Scribner (23) published ''THE GRASSES OF IOWA, PART II,' the only more or less complete treatment of Iowa grasses. Additional specimens of grasses have been collected in numerous localities since the appearance of these two papers; changes in the Rules of Botanical Nomenclature, together with detailed studies of certain genera, have made necessary some changes in the scientific names of Iowa grasses. For these two reasons, a recapitulation of present …
Dry Heat Sterilization Of Wood, George L. Coffey
Dry Heat Sterilization Of Wood, George L. Coffey
Proceedings of the Iowa Academy of Science
In experiments dealing with wood rotting fungi, the best means of sterilizing the wood has long been a controversial question. In the majority of the work, the autoclave has been used for this purpose. This intense moist heat undoubtedly has an effect on the chemical composition of the wood, and therefore is not a satisfactory means of sterilization. Spauling (1906) states that at 100°C. 15-40 hours are necessary to effect any changes in the wood elements. Snell (1922) says that 12 hours at 105°C. (dry heat) is necessary to kill all of the mycelium in wood blocks % inch square …
An Annotated Checklist Of The Homobasidiomycetes Of Iowa, Phyllis D. Gardner
An Annotated Checklist Of The Homobasidiomycetes Of Iowa, Phyllis D. Gardner
Proceedings of the Iowa Academy of Science
The Homobasidiomycetes comprises those Basidiomycetes characterized by simple basidia and basidiospores which do not, as a rule, germinate by repetition but produce a mycelium directly. According to the current treatment followed in this laboratory, there are seven recognized orders, all of which occur in Iowa. One order, the Exobasidiales, is characterized by the absence of a fruiting body, the place of that structure being taken by the parasitized tissues of the host. Of those orders in which a basidiocarp is present, the Agaricales possesses a hymenium or fruiting layer often exposed from the beginning and always before the spores are …
Pollen Germination In Relation To Group Size, H. W. Beams, R. L. King
Pollen Germination In Relation To Group Size, H. W. Beams, R. L. King
Proceedings of the Iowa Academy of Science
In recent experiments involving the germination of the pollen grains of Vinca rosea, it was observed that relatively poor germination occurred in isolated grains and among those grains aggregated in small groups (Beams and King, 1944). These preliminary observations seemed to warrant a further study of this problem. Accordingly, experiments were designed to determine some of the effects of population density on the percentage germination of these cells.
A Histological Study Of Heterosis M The Caryopsis Of Maize, Jane Magee
A Histological Study Of Heterosis M The Caryopsis Of Maize, Jane Magee
Proceedings of the Iowa Academy of Science
A histological study was made of the kernels of inbred lines of popcorn, dent corn and their reciprocal hybrids to compare the rate of development of organs and tissues. Hybrid vigor was apparent in the rate of leaf initiation and radicle differentiation and the development of the endosperm tissues. In general, the rate of development of the hybrid surpassed that of the inbred maternal parent. Reciprocal hybrids did not show the same rate of development in all tissues of the caryopsis.
Mechanism Of Protein Synthesis, W. E. Loomis
Mechanism Of Protein Synthesis, W. E. Loomis
Proceedings of the Iowa Academy of Science
Animal muscle proteins are stated by Rose (10) to contain 21 amino acids of which 10 must be derived directly from the food while 11 can be modified by transamination provided some other primary amino acid is supplied. Although storage and particularly seed proteins are relatively simple in their structural pattern and amino acid content, herbivorous, and eventually all, animals derive their amino acids entirely from plant products. It seems reasonable to assume, therefore, that leaf proteins are comparable in complexity and amino acid distribution to muscle proteins.
Kernel Morphology In Lines Of Pop Corn Of Diverse Geographical Origin, J. E. Sass, J. C. Eldredge
Kernel Morphology In Lines Of Pop Corn Of Diverse Geographical Origin, J. E. Sass, J. C. Eldredge
Proceedings of the Iowa Academy of Science
The internal structure of the kernel has been compared in many inbred lines of popcorn. The probable geographical origin of the four lines reported here has been ascertained by other workers on the basis of gross plant characters.
Specific Tissue Responses Of Some Weeds To 2-4 Dichlorphenoxyacetic Acid, J. E. Sass, E. P. Sylwester
Specific Tissue Responses Of Some Weeds To 2-4 Dichlorphenoxyacetic Acid, J. E. Sass, E. P. Sylwester
Proceedings of the Iowa Academy of Science
A survey of the specific responses of some common weeds to 2-4 D has revealed considerable diversity with respect to the tissues involved and the relative extent of hyperplasia and hypertrophy. The present report is confined to three weeds showing strikingly contrasting reactions.
Abstract Of Paper On Iowa Coals, S. W. Hockett
Abstract Of Paper On Iowa Coals, S. W. Hockett
Proceedings of the Iowa Academy of Science
The chemistry department of Iowa Wesleyan College first began a preliminary chemical analysis on some South-Eastern Iowa coals, along the conventional lines of "proximate analyses.” Samples in the exhibit shown at the Academy meeting included coals from some of the earliest coals mined west of the Mississippi river, coming from mines in Van Buren County near Bonaparte and Farmington. Analysis of these specimens showed that they ran fairly true to the pattern set forth in the Iowa state mine inspectors' reports, such as that for the two-year period ending Dec. 31, 1945.
A Recount By Species Of The Trees Of Mount Pleasant, Iowa, Jean Morrow, H. E. Jaques
A Recount By Species Of The Trees Of Mount Pleasant, Iowa, Jean Morrow, H. E. Jaques
Proceedings of the Iowa Academy of Science
During the winter of 1924-25, a count by species of the trees within the city limits of Mt. Pleasant was made by the students of the Biology Department of Iowa Wesleyan College. A recount of the trees in this area was made by the students during the winters of 1945-46-47. All trees over four inches in diameter at breast height were counted.
The Kilowatt-Hour Meter In A Student Experiment, Grant O. Gale
The Kilowatt-Hour Meter In A Student Experiment, Grant O. Gale
Proceedings of the Iowa Academy of Science
In our general physics course for non-science students, we have for some years given the students a chance to "experiment" with electrical equipment usually found in the home, and to make it more real, we have arranged a panel to simulate a house with the main entrance switch, fuse block, kilowatt-hour meter, and two branch fuse blocks; one going to an ordinary group of switches and outlets, and the other to a lamp to be controlled by two three-way switches. Regular commercial fixtures, switches, flush receptacles, etc., are used throughout. The student is given a pair of pliers, screwdriver, roll …
On The General Theory Of Functions, E. W. Chittenden
On The General Theory Of Functions, E. W. Chittenden
Proceedings of the Iowa Academy of Science
For the purposes of mathematics the general notion of logic 'propositional function' may be used to define a concept which we may wish to regard as a mathematical function. The term function will be restricted to entities which satisfy the conditions imposed. These conditions may be regarded as axioms. They imply certain elementary properties of functions which we may call theorems, although it seems legitimate to raise the question: Are these propositions in logic or mathematics? The symbolism, and methodology are those of mathematics. The significance is so broad that the subject as a whole may be regarded as at …
Student Measurement Of Capacitance By The Method Of Substitution, W. H. Kadesch
Student Measurement Of Capacitance By The Method Of Substitution, W. H. Kadesch
Proceedings of the Iowa Academy of Science
The time-honored methods of measuring capacitance are the deflection method, with a ballistic galvanometer, and the bridge method, using a current galvanometer if by D.C., or a pair of earphones if by A.C. In recent years the vacuum tube oscillator, with some type of detector, has made it possible to measure capacitances more accurately and more readily.
An Interesting Case Of Undercooling, Earl C. Mccracken
An Interesting Case Of Undercooling, Earl C. Mccracken
Proceedings of the Iowa Academy of Science
Whenever the subject of undercooling of a liquid is taken up in a physics text, some such statements as those quoted appear in the discussion. The difficulties of getting a successful mass demonstration of the undercooling of water are well known. Hence it was thought worthwhile to report one of the interesting cases of water undercooling under what seem to be most unfavorable circumstances. In carrying on investigations of the operating characteristics of home freezers in the United States Bureau of Human Nutrition and Home Economics, one of the tests includes the freezing of a volume-capacity load with water as …
Co-Variation Of Cynicism And Idealism, Martin F. Fritz
Co-Variation Of Cynicism And Idealism, Martin F. Fritz
Proceedings of the Iowa Academy of Science
Last year (1946) two papers were presented before the psychology section of the Iowa Academy of Science by Mr. Charles O. Neidt and the author of this paper, dealing with the construction and statistical analysis of a test designed to measure the variables of cynicism and idealism. The test, consisting of 200 items, is called a "Practical Policy Test" in order to avoid indicating its exact nature to the subject. The details of administering the test will not be repeated here (1), except to say that a four-point scale was used in order to secure graded responses as follows: A-very …
Improvement Of Test Criteria, A. R. Lauer
Improvement Of Test Criteria, A. R. Lauer
Proceedings of the Iowa Academy of Science
Perhaps no other science is as conscious of validity coefficients as psychology. This may be partly due to the impetus given statistical methods by such early investigators as Galton, Pearson, Yule, and Spearman. Later work by Thurstone, Fisher, Holzinger, Garret and others has kept the profession highly conscious of the need for refined and, in some instances, involved statistical evaluation. In certain types of experimental work, such as mental testing, it is highly essential to keep the validity of tests high. It is, of course, taken for granted that in any science accurate measuring instruments are available for use without …
Positive Transfer As A Factor In Memory, Richard Wellington Husband
Positive Transfer As A Factor In Memory, Richard Wellington Husband
Proceedings of the Iowa Academy of Science
It is but reiteration to observe that once a skill has been acquired or a problem solved, the second attempt at that or a similar task will be accomplished with greater efficiency, lesser expenditure of time or effort, or both. Such improvement may be due either to memory or transfer of training-memory when repetition of the same performance is requested at a later date, and transfer when a different but more or less similar task is to be done. Memory is commonly measured by one of two principal ways: by amount retained, and by relearning. The latter method gives an …
Certain Factors Affecting The Legibility Of Stop Signs, A. R. Lauer, L. F. Embree
Certain Factors Affecting The Legibility Of Stop Signs, A. R. Lauer, L. F. Embree
Proceedings of the Iowa Academy of Science
In the evolution of highway signs, the square or rectangular shape was first used to indicate any conditions which might affect driving on the highway. When it became necessary to differentiate between conditions along the right-of-way from conditions on the right-of-way, it was decided to rotate the square sign 45 degrees and let the diamond-shaped sign stand for curves, dips, hills, and other conditions on the roadway proper. Later, when a sign was needed to indicate STOP someone suggested cutting off the corners and making an octagonal sign of the diamond. The round sign was adopted as the designation for …
A Comparison Of The Minnesota Personality Scale And The Bell Adjustment Inventory For Student Counseling, George D. Lovell, Gloria Laurie, Doris Marvin
A Comparison Of The Minnesota Personality Scale And The Bell Adjustment Inventory For Student Counseling, George D. Lovell, Gloria Laurie, Doris Marvin
Proceedings of the Iowa Academy of Science
The purpose of this study is to report the findings concerning the comparative diagnostic value of two personality tests, the Bell Adjustment Inventory (Student form) and the Minnesota Personality Scale, for use in student counseling. The Bell Adjustment Inventory has been used for the past six years as a part of the battery of tests given during New Student Days at Grinnell College, with apparently satisfactory results. However, with the development of the new Minnesota Personality Scale, it was felt by the college personnel department that perhaps this test would prove of even greater diagnostic value in the counseling program.
Some Personality Traits Of Collegiate Underachievers, Wilma C. Winberg
Some Personality Traits Of Collegiate Underachievers, Wilma C. Winberg
Proceedings of the Iowa Academy of Science
The purpose of this study was to identify certain measurable personality traits characteristic of scholastic underachievement from the results of selected personality tests. Underachievement is defined in terms of a negative discrepancy between predicted and achieved grade point averages. Measurable personality traits are defined in terms of item respom1es on three personality inventories of 543 items. Current work on personality and personality testing tends to reveal that personality is environmentally conditioned. To date, most personality tests have been validated by the method of internal consistency and not against an external criterion. A preliminary survey suggested that academic underachievers are somewhat …
The Underlying Philosophy Of The Iowa Secondary School Curriculum Program, W. H. Mcfarland
The Underlying Philosophy Of The Iowa Secondary School Curriculum Program, W. H. Mcfarland
Proceedings of the Iowa Academy of Science
The Iowa Secondary School Curriculum Program involves providing curriculum materials in all areas of high school instruction. Traditional subject matter areas have been maintained, not because we have assurance that this offers the best procedure in secondary education, but because under present conditions it probably affords the most practical and feasible procedure. The areas treated are broken down as follows: English and speech, language, science, mathematics, social studies, practical arts, fine arts, physical education and health, guidance, and extra-curricular activities.
Progress Report On Revision Of Curriculum In General Science For Iowa High Schools, Ralph A. Shalla
Progress Report On Revision Of Curriculum In General Science For Iowa High Schools, Ralph A. Shalla
Proceedings of the Iowa Academy of Science
Fellow teachers and scientists, I am very glad to present to this group the work that has been done so far by the General Science Production Committee in the building of a state course of study for the State of Iowa. The members of the production committee are Mr. Dean C. Stroud of Amos Hiatt Junior High School in Des Moines, who is the writer, Mr. Don L. Hempstead of Frank L. Smart Intermediate School of Davenport, Mr. W. Gjerde of Iowa State Teachers College at Cedar Falls and Mr. Ralph A. Shalla of Keokuk Junior High School at Keokuk, …
Progress Report On Revision Of Curriculum In Biology For Iowa High Schools, Richard F. Trump
Progress Report On Revision Of Curriculum In Biology For Iowa High Schools, Richard F. Trump
Proceedings of the Iowa Academy of Science
When our committee submitted a list of objectives for high school biology to one of our colleagues for criticism, he commented in the margin, "Making objectives has been a favorite indoor sport of educators for a number of years; but attaining the objectives is a different species of animal!" From the outset of our investigation we have been aware that we could contribute very little to science teaching by producing a better set of aims or objectives. We know that for a long time teachers with good objectives have taught poor biology, while other teachers with the same objectives-or with …
Abstract: A Spectrophotometric Study Of A Developing Egg (Orthoptera) With Especial Reference To Riboflavin And Its Derivatives, J. H. Bodine, L. R. Fitzgerald
Abstract: A Spectrophotometric Study Of A Developing Egg (Orthoptera) With Especial Reference To Riboflavin And Its Derivatives, J. H. Bodine, L. R. Fitzgerald
Proceedings of the Iowa Academy of Science
Spectrophotometric studies of the developing egg of the grasshopper (Melanoplus differentialis) show, (a) the presence of riboflavin in the newly-laid egg; (b) no changes in the riboflavin of the developing egg occur until late in prediapause (15th to 19th day of development at 25°C.); (c) differences in the transmittance of the acid (pH 4.5) and alkaline (pH 10) diffusible fractions indicate changes in the original riboflavin content of the eggs; (d) during the diapause or resting developmental period no further changes in the riboflavin are noted; ( e) in active postdiapause development changes in the riboflavin increase up …
Abstract: Lethal Effect Of Some Stylet Cercariae On Various Fishes, F. G. Brooks
Abstract: Lethal Effect Of Some Stylet Cercariae On Various Fishes, F. G. Brooks
Proceedings of the Iowa Academy of Science
Incidental to a study being conducted on the cercariae infesting the snails of Carrol Lake, Oneida County, Wisconsin, it has been found that certain Xiphidiocercariae, when in high concentrations, will kill fish of various species. Controlled experiments using five cercariae of the stylet group indicated that the cercariae to which the provisional designations D. S. and Eta have been given pending publication of their descriptions were lethal to sunfish, perch, and large-mouth bass when they were placed in battery jars with from three to forty-eight infested snails, while C. Gamma and the cercaria of Plagiorchis ameiurensis, McCoy, 1928 were …
The Periodical Cicada, Brood Iii, In Iowa, D. Elmo Hardy
The Periodical Cicada, Brood Iii, In Iowa, D. Elmo Hardy
Proceedings of the Iowa Academy of Science
The last study of the distribution of brood III in Iowa was apparently that made by Professor Bessey in 1878. This report was based upon information obtained from questionnaire postcards, from an inquiry published in the State Agricultural College Quarterly and from interviews with college students. From these sources he received reports of the brood being present in twenty-eight counties the spring of 1878. Many of his correspondents stated that the cicadas were not as abundant in 1878 as they were in 1861 and Professor Bessey wondered if this brood might be dying out. There can be no doubt but …
Basic Concepts In The Interpretation Of Visual Phenomena, Theodore Louis Jahn
Basic Concepts In The Interpretation Of Visual Phenomena, Theodore Louis Jahn
Proceedings of the Iowa Academy of Science
During the past decade several attempts have been made to formulate equations which would explain certain visual phenomena, namely flicker fusion frequency, brightness discrimination, visual acuity, and instantaneous thresholds as functions of intensity, and light and dark adaptation as functions of time. These various equations are based on several fundamental concepts regarding the mechanism by which the visual sensation is determined. Each concept has been explained by the original author at the time the theory was proposed, but no comparison of these basic ideas has yet appeared in the literature. The purpose of the present paper is to make such …