Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Education (15473)
- Arts and Humanities (6835)
- Higher Education (5891)
- Social and Behavioral Sciences (4353)
- Science and Mathematics Education (4046)
-
- Creative Writing (2244)
- Music (2127)
- Music Performance (1848)
- Physical Sciences and Mathematics (1726)
- Life Sciences (1546)
- English Language and Literature (1367)
- Curriculum and Instruction (1033)
- 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 (449)
- Art and Design (445)
- Communication (436)
- Health and Physical Education (417)
- 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 (2719)
- 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 33841 - 33870 of 35955
Full-Text Articles in Entire DC Network
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
Proceedings Of The Thirty-Eighth Annual Meeting Of The Iowa Academy Of Science, Held At Ames, May 2 And 3, 1924: Minutes Of The Meeting; Staff & Committee Reports
Proceedings of the Iowa Academy of Science
No abstract provided.
The Iowa Academy Of Science (Paper Presented At The Thirty-Eighth Annual Meeting Of The Iowa Academy Of Science), D. S. Fairchild
The Iowa Academy Of Science (Paper Presented At The Thirty-Eighth Annual Meeting Of The Iowa Academy Of Science), D. S. Fairchild
Proceedings of the Iowa Academy of Science
In the early days of Iowa, not pioneer days, or building home days, but after homes had been assured, educational interests began to develop. As early as 1872 our higher institutions of learning, the Iowa State University at Iowa City and the Iowa State College at Ames, had but small facilities and the men teaching different branches, to a degree, confined their work to a specialty. There were no professors teaching natural philosophy, or natural history, which included all animal and vegetable life, as in so many of the old time colleges. In about 1880 or earlier, both the University …
Contributions To Knowledge By Gustavus Detlef Hinrichs, M.D., Ll.D. (Paper Presented At The Thirty-Eighth Annual Meeting Of The Iowa Academy Of Science), Charles Keyes
Proceedings of the Iowa Academy of Science
As an original organizer and charter member of the Iowa Academy of Sciences, that society which is the parent of our present Academy, the latter holds with peculiar attachment the memory of the late Dr. Gustavus Hinrichs, who is, for more than a quarter of a century, also identified with the faculty of our State University as one of its most distinguished members. He further organizes and conducts for 15 years our State Weather Service, the first of the kind to be inaugurated in this country. A brief life-sketch of this gifted man appears in our Proceedings of last year, …
Bios, A Resumé, Ellis I. Fulmer
Bios, A Resumé, Ellis I. Fulmer
Proceedings of the Iowa Academy of Science
The development of the work on Bios was discussed by considering some typical contributions grouped as indicated below.
A Suggested Classification For Bacteriological Media, Henry W. Schoenlein Jr.
A Suggested Classification For Bacteriological Media, Henry W. Schoenlein Jr.
Proceedings of the Iowa Academy of Science
The compilation of the formulae and methods of preparation of the media and substrata described in the literature for the support of growth of microorganisms is a task that has seemed of sufficient practical importance to warrant its being undertaken by the bacteriological laboratories of the college. In order that these data, with reference to each medium, and an elaborate system of cross indices might be prepared, it was necessary to have some definite scheme of classification. A review of the literature shows that several types of classification for media have been suggested by different authors.
Food Preservation And So-Called "Food Poisoning", George G. De Bord
Food Preservation And So-Called "Food Poisoning", George G. De Bord
Proceedings of the Iowa Academy of Science
Food preservation embraces a large variety of methods for the storage of food products, for example, drying, storage at low temperatures, and heating in hermetically sealed containers. For the present the last named method will be considered in relation to diseases.
Production Of Hydrogen Sulphide By Members Of The Colon Group Of Bacteria, Frederick W. Mulsow, Frederick S. Paine
Production Of Hydrogen Sulphide By Members Of The Colon Group Of Bacteria, Frederick W. Mulsow, Frederick S. Paine
Proceedings of the Iowa Academy of Science
Not a little work has been done in the past few years in investigating the sulphur metabolism of the colon group of bacteria. So far no very definite conclusions seem to have been arrived at, and the results are rather conflicting. Myers (1920) suggests that hydrogen sulphide production in the intestinal tract is due to proteolytic organisms. He attempted to use hydrogen sulphide production for water analysis, but concludes: "There is no constant relationship between the number of colon bacilli present from different animals and the amount of H2S produced." Other workers have believed the production of hydrogen …
The Need For Better Methods For Determinating The Purity Of Stream Water, H. V. Pederson
The Need For Better Methods For Determinating The Purity Of Stream Water, H. V. Pederson
Proceedings of the Iowa Academy of Science
The prevention or control of stream pollution or the conservation of the quality of the water of streams has of late years become one of the primary objects of study in the United States. In the east a number of the states have been at work for several years and have arrived at some definite conclusion concerning the streams which flow through or border their states. A number of publications have been issued which clearly set forth the various problems of stream pollution and attempts have been made to explain a solution to the problem.
Distribution Of Plants On Upper Skunk River Iowa, Raymond J. Becraft
Distribution Of Plants On Upper Skunk River Iowa, Raymond J. Becraft
Proceedings of the Iowa Academy of Science
Data is presented on the distribution of species along the Upper Skunk River, the percent of different species is given in the principal physiographic divisions.
Genetic Relation Of Endosperm And Chlorophyll Characters In Maize, W. A. Carver
Genetic Relation Of Endosperm And Chlorophyll Characters In Maize, W. A. Carver
Proceedings of the Iowa Academy of Science
The interrelation of sugary endosperm, virescent, and brindled, a chlorophyll defect, was studied. Brindled was found to be a simple Mendelian recessive to normal green. Brindled and virescent proved to be independent in inheritance. The double recessive condition of the factors for virescent and brindled produces an albino plant. The brindled character and sugary endosperm showed a linkage (in the repulsion phase) with 26.3 percent crossing-over.
Species Crosses In The Genus Cucurbita, Edward F. Castetter
Species Crosses In The Genus Cucurbita, Edward F. Castetter
Proceedings of the Iowa Academy of Science
Various attempts were made to cross different varieties belonging to three species. Successful crosses have been made as follows: (1) Hubbard Squash (C. maxima) as the pistillate parent x Common Field Pumpkin (C. pepo). Viable seeds which produced vigorous fertile Fl plants were secured from this cross. The reciprocal cross produced normal fruits, but no fertile seeds. (2) Hubbard Squash (C. maxima) as the pistillate parent x Large Cheese Pumpkin (C. moschata) produced fruits which contained no fertile seeds, although otherwise normal. (3) Scalloped Squash (C. pepo) as the pistillate parent x Large Cheese Pumpkin …
Comparative Anatomy Of Huban And Biennial Sweet Clover, Alice M. Crozier
Comparative Anatomy Of Huban And Biennial Sweet Clover, Alice M. Crozier
Proceedings of the Iowa Academy of Science
Comparative study of the anatomy of the roots, leaves, of one and two-year-old plants leaf petioles, and the flower stalks of both varieties of sweet clover.
Response Of The Genus Rhamnus To Puccinia Coronata Corda, S. M. Dietz
Response Of The Genus Rhamnus To Puccinia Coronata Corda, S. M. Dietz
Proceedings of the Iowa Academy of Science
All of the several species and varieties of Rhamnus exposed to infection with Puccinia coronata Corda show some degree of infection with some form of crown rust. Eleven species of Rhamnus produced aecidiospores which were able to infect oats, from teleutospores developed on oats. Of the susceptible buckthorn species, only Rhamnus cathartica, R. lanceolata and R. alnifolia occur in Iowa. The former is a cultivated species imported from Europe that has escaped from cultivation in many places. Rhamnus lanceolata is commonly found along the small streams and shaded dry runs throughout the southern half of this state and as far …
Tropograph And Flectograph, W. J. Himmel
Tropograph And Flectograph, W. J. Himmel
Proceedings of the Iowa Academy of Science
The former is an instrument devised in the Laboratory of Plant Physiology of the State University of Iowa for recording the pull exerted by a plant giving a tropic response. It has so far been applied only to the case of a plant placed horizontally and attempting to bend upwards in response to gravity. As the stem raises very slightly an electrical contact is made and a shot dropped into a container attached to the end of the stem. Shots will be added singly at one-minute intervals until the plant is drawn back to its horizontal position, thereby breaking the …
Genetic Linkage Between Chlorophyll And Carotinoid Pigments In Maize, E. W. Lindstrom
Genetic Linkage Between Chlorophyll And Carotinoid Pigments In Maize, E. W. Lindstrom
Proceedings of the Iowa Academy of Science
Genetic analysis of the inheritance of the pigments chlorophyll and carotin (and xanthophyll) in maize have demonstrated beyond reasonable doubt that these two groups of pigments are controlled by different genetic factors. Most of the genes for chlorophyll development are independently inherited of the yellow-producing gene, l. However, a case of linkage, involving this yellow factor and one of the three complementary genes responsible for chlorophyll development in the seedling stage of maize has now been discovered.
Comparative Rates Of Imbition In Apple Wood Tissue, Charles F. Rogers
Comparative Rates Of Imbition In Apple Wood Tissue, Charles F. Rogers
Proceedings of the Iowa Academy of Science
Experiments were conducted to find a possible relation between the rate of imbibition in apple wood, and its capacity to withstand adverse climatic conditions. Air dry tissue was ground so that 99.5 percent passed through a 100-mesh sieve. The twelve varieties used were subjected to a saturated atmosphere at constant temperature. The amount of imbibition was determined by frequent weighings. The maximum rate, and the greatest total imbibition occurred in those varieties which have proved to be least hardy in Iowa.
Hybrid Oaks In Iowa, B. Shimek
Hybrid Oaks In Iowa, B. Shimek
Proceedings of the Iowa Academy of Science
A brief review of the hybrid oaks reported from Iowa, with notes on the additional hybrids Q. imbricaria x velutina and Q. imbricaria x marilandica from southern Iowa.
The Morphology Of Basidiophora Kellermanii, Guy West Wilson
The Morphology Of Basidiophora Kellermanii, Guy West Wilson
Proceedings of the Iowa Academy of Science
This interesting fungus was first brought to the notice of mycologists in 1889. It was originally collected two years earlier by Dr. W. A. Kellerman at Manhattan, Kansas. It has since been frequently collected from Kansas and Colorado northward and eastward to Manitoba and Wisconsin. Specimens are variously labelled in herbaria under Albugo, Plasmopara, Peronospora and Basidiophora. The fungus is abundant and conspicuous in the field on its single host, Iva xanthifolia Nutt.. The first impression is that of a downy mildew, but a closer view suggests a white rust. The taxonomic position of this fungus has been a puzzle …
The Botanical Work Of Dr. L. H. Pammel At Iowa State College, A. T. Erwin
The Botanical Work Of Dr. L. H. Pammel At Iowa State College, A. T. Erwin
Proceedings of the Iowa Academy of Science
The task of reciting the history and activities of the work in botany at Iowa State College under the leadership of Dr. L. H. Pammel for the last thirty-five years is no small one and while worthy of an abler pen, is an assignment which I accept with pleasure. A few figures taken from the college catalog the year Dr. Pammel took up his work here, 1889, and for the current year, may be of interest to this end.
Water Conduction In Apple Trees Affected With Crown Gall, J. H. Muncie, Christine Berkhout
Water Conduction In Apple Trees Affected With Crown Gall, J. H. Muncie, Christine Berkhout
Proceedings of the Iowa Academy of Science
In an investigation of the effect of crown gall on apples caused by Bacterium tumefaciens, a study was made of water conduction in galled and healthy trees. The comparative rate of flow through galled and healthy apple specimens was determined by means of a U tube manometer
The House Fungus, Merulius Lacrymans (Jacq.) Fr., W. H. Davis
The House Fungus, Merulius Lacrymans (Jacq.) Fr., W. H. Davis
Proceedings of the Iowa Academy of Science
Merulius lacrymans is one of the wood-rotting fungi which are destroyers of trees, lumber, structural timbers and other forms of wood. Under certain conditions, this fungus is especially harmful to the wood in houses and for this reason it is known as the house fungus. The presence of fungi in wood is generally shown by a white floccose growth or mushroom-like sporophore on the exterior of the infected material. The house fungus announces its presence, only too late, by a cottony mass of hyphal threads spreading over the infected surfaces or emerging through cracks between walls and floors. This circular …
The Physiology Of Growth, Clifford H. Farr
The Physiology Of Growth, Clifford H. Farr
Proceedings of the Iowa Academy of Science
The evolution of scientific terminology constitutes an exceedingly interesting subject for study, and may be looked upon as one of the most prevalent "growing pains" of almost any branch of science. The rapidly developing field of plant physiology is by no means an exception to this; in fact, it furnishes some of the most flagrant examples. A special term is given to a specific quantity, structure, or process, which it is made to fit apparently with great precision. And then as our knowledge extends, we find the name and the scientific entity no longer correspond. The term becomes a misfit, …
At What Depth Should Clover Seeds Be Planted?, Winfield Scott
At What Depth Should Clover Seeds Be Planted?, Winfield Scott
Proceedings of the Iowa Academy of Science
The value of the clovers in a system of farming has been known for centuries. The peoples of our early civilization tilled these crops for their food value and for their beneficial influences on the productive power of the soil. These early peoples handed on to succeeding generations their observations concerning the production of these plants. By the middle of the seventeenth century a considerable body of information concerning the methods of seeding and harvesting had been recorded, and while these facts were not established by scientific experimentation they were highly reliable because of their foundation in long established farm …
Iowa Plant Notes, R. I. Cratty
Iowa Plant Notes, R. I. Cratty
Proceedings of the Iowa Academy of Science
Recently quite a number of plants new to the State or noteworthy for other reasons, have come under the writer's observation, and it seems well at this time to place these on record. For many years after the settlement of the State the introduction of exotic species was comparatively slow, and was largely confined to those grasses and weeds which were introduced in grain seed, but of late years we are rapidly approaching the condition of the floras found in the Atlantic States where an astonishing number of plants have been introduced, largely of European origin. With us, too, the …
The Polyporaceae Of Iowa, Robert E. Fennell
The Polyporaceae Of Iowa, Robert E. Fennell
Proceedings of the Iowa Academy of Science
The group of fungi belonging to the family Polyporaceae are principally wood inhabiting, a few species occurring on the soil. In making a survey of a woody area during either the spring, summer, or autumn, species of this group can always be found. These fungi grow either saprophytically on dead trees, both fallen and standing, or parasitically on living trees. Typical forms may be found on almost every stump, on prostrate logs and trees, on bridges, posts, and piers. Economically the family is of very little importance. A few of the species are edible, but since the American people do …
The Prairie Of The Mississippi River Bluffs, B. Shimek
The Prairie Of The Mississippi River Bluffs, B. Shimek
Proceedings of the Iowa Academy of Science
The rugged bluffs along the upper Mississippi river, particularly those which border that part of the river flowing between Iowa and Wisconsin, display irregular treeless tracts on their slopes which are sure to attract the attention of observers who travel along the river either by water or by land.
The Genus Rumex In Iowa, R. I. Cratty
The Genus Rumex In Iowa, R. I. Cratty
Proceedings of the Iowa Academy of Science
The genus Rumex includes about 140 species, commonly known as Docks or Sorrels, and is best represented in the North Temperate Zone, a few occurring in South America, South Africa and Australia.
The Uredinales (Rusts) Of Iowa, J. C. Arthur
The Uredinales (Rusts) Of Iowa, J. C. Arthur
Proceedings of the Iowa Academy of Science
Forty years ago a "preliminary list" of the rusts (Uredinales) of Iowa was published by the writer. It was the first list, and up to the present time is the only list of Iowa rusts to be published. That first list numbered 134 species, as they were then rated, the list now presented numbers 164 species, as they are now understood.
Viability Tests Of Seeds Of Different Ages, Charlotte M. King
Viability Tests Of Seeds Of Different Ages, Charlotte M. King
Proceedings of the Iowa Academy of Science
Studies of longevity of seeds, of dormant period, and of vitality after subjection to certain conditions, have been made by numerous investigators, with many kinds of seeds. These all contribute to the understanding of changes which take place in the development of the seed, and of conditions necessary for growth. Such determinations have definite application to scientific agriculture. There may be called to notice results of a few notable studies of germination conditions of seeds. Dr. Candolle found certain seeds of Malvaceae, Leguminosae and Labiate to be germinable after having been kept dry for fifteen years. Beal found that various …