Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Education (15474)
- 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 (2725)
- 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 31171 - 31200 of 35961
Full-Text Articles in Entire DC Network
The System Potassium Chloride-Acetamide, Donald A. Stookey, Ben H. Peterson
The System Potassium Chloride-Acetamide, Donald A. Stookey, Ben H. Peterson
Proceedings of the Iowa Academy of Science
The freezing point curve of acetamide solutions of potassium chloride is determined up to saturation at the freezing point.
Chemistry In The Iowa Academy Of Science, L. Chas. Raiford
Chemistry In The Iowa Academy Of Science, L. Chas. Raiford
Proceedings of the Iowa Academy of Science
As indicated in Table I, a preliminary meeting looking toward the organization of an academy of science in Iowa was held in Iowa City in 1875. According to the records three professors and four doctors were present at the meeting. Two of the professors were from Ames and one from Iowa City, while Ames, Iowa City, Davenport and Des Moines were represented by the four medical men. Five other persons, two of whom were in academic work and three in medical practice, stationed at Iowa City, Tabor, Clinton, Davenport and Dubuque, respectively, had previously expressed their approval of the proposed …
Growth On Histidine And Lysine Injected Subcutaneously Or Intraperitoneally, Ralph M. Conrad, Clarence P. Berg
Growth On Histidine And Lysine Injected Subcutaneously Or Intraperitoneally, Ralph M. Conrad, Clarence P. Berg
Proceedings of the Iowa Academy of Science
Recently a controversy has arisen in the literature as to whether or not tryptophane can be utilized for growth when administered subcutaneously. The evidence, is divided, but favors the affirmative somewhat. The fundamental question involved embraces also other amino acids, especially the essential ones. We have therefore tested the growth-promoting abilities of histidine and lysine when subcutaneously or intraperitoneally administered to rats fed diets deficient in histidine or lysine respectively, but otherwise adequate. In every case growth resulted.
Basic Strength Of Ketimines By The Use Of The Glass Electrode, J. B. Culbertson, Dewalt Young
Basic Strength Of Ketimines By The Use Of The Glass Electrode, J. B. Culbertson, Dewalt Young
Proceedings of the Iowa Academy of Science
The relative strengths of the ketimines as organic nitrogen bases has been considered one of the prime factors affecting the stability of the ketimine salts toward hydrolysis to ketones. A measurement of the hydrogen (hydronium) ion concentration of ketimine salts (hydrochlorides) furnishes the information necessary for the calculation of these basic strengths.
Hydroquinone Monoacetate, H. S. Olcott
Hydroquinone Monoacetate, H. S. Olcott
Proceedings of the Iowa Academy of Science
Alkyl monoesters of hydroquinone and pyrocatechol have not hitherto been prepared. Hydroquinone monoacetate has been obtained by the following series of reactions. Hydroquinone plus one molar equivalent of carbobenzoxy chloride gives hydroquinone monobenzyl carbonate. This compound is acetylated, and then hydrogenated in alcohol with Pd or Ni catalyst. Hydroquinone monoacetate, plates or needles from petroleum ether, M. P. 57- 59oC., is obtained from the residue.
New Exposures Of Upland Nebraskan Drift In Northeastern Iowa, A. C. Trowbridge
New Exposures Of Upland Nebraskan Drift In Northeastern Iowa, A. C. Trowbridge
Proceedings of the Iowa Academy of Science
Remnants of Nebraskan drift, as recently exposed capping a high Mississippi River bluff in the city of Dubuque and occupying caverns and sinks in the Mississippi River bluff near Guttenberg, are described and interpreted.
The Loveland And Peorian Loesses Of Iowa, Geo. F. Kay, Paul T. Miller
The Loveland And Peorian Loesses Of Iowa, Geo. F. Kay, Paul T. Miller
Proceedings of the Iowa Academy of Science
Two Pleistocene eolian deposits, the Loveland loess and the Peorian loess, have wide distribution in Iowa. The Loveland loess, the older, was deposited, wholly or in large part, in an interglacial age - in late Sangamon time; the Peorian loess, the younger, was deposited in a glacial age - in the Iowan phase of the Wisconsin Age.
The Liquid Structure Of The N-Paraffins, A. B. Carr
The Liquid Structure Of The N-Paraffins, A. B. Carr
Proceedings of the Iowa Academy of Science
The object of this investigation is to determine whether or not Pierce's density computations compare the more favorably with the hexagonal or the square array.
Eye Movement Of Stutterers During Oral Reading, H. C. Wyland
Eye Movement Of Stutterers During Oral Reading, H. C. Wyland
Proceedings of the Iowa Academy of Science
This study is an attempt to evaluate the meaning of the eye movements of stutterers during oral reading.
The Organization Of Function In The Delinquent, Newell C. Kephart
The Organization Of Function In The Delinquent, Newell C. Kephart
Proceedings of the Iowa Academy of Science
The thesis in this study was that juvenile delinquents display personality defects which may be described as disorganization of the mental data. Such disorganization is thought of as a disconnectedness between the elements of the psychic material. It is thought that delinquent subjects as a group will give evidence in performance of less dynamic dependency among these data than will non-delinquent subjects as a group.
The Adaptation And Variability Of Response Of The Human Brain, B. K. Bagchi
The Adaptation And Variability Of Response Of The Human Brain, B. K. Bagchi
Proceedings of the Iowa Academy of Science
Electrical potentials have been recorded from the brain of five normal human subjects by means of needle electrodes inserted about half a centimeter through the scalp, one near the external occipital protuberance and another about three inches forward and an inch to the side from the median line. The high time-constant of the amplifier, which was about a second, made it possible to obtain an almost distortionless recording of the low frequency waves. The amplifier was connected to the oscillograph element. The oscillation of the light beam projected from the element was photographed on sensitized paper.
Handedness In The First Two Years Of Life, Ruth Klein Lederer
Handedness In The First Two Years Of Life, Ruth Klein Lederer
Proceedings of the Iowa Academy of Science
A study of handedness in the first two years of life should contribute to a systematic description of the development of handedness at this period, factual information concerning which has heretofore been lacking. In this approach handedness has been defined in terms of a psychological concept and is limited to overtly discernible handed behavior.
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
Pathological Polyploidy In Seedlings Of Corn And Sorghum, J. E. Sass
Pathological Polyploidy In Seedlings Of Corn And Sorghum, J. E. Sass
Proceedings of the Iowa Academy of Science
The writer had demonstrated that Coprinus sterquilinus contains an extra-nuclear mechanism which bears structural homologies with the Golgi apparatus in animal spermatocytes. Numerous other Hymenomycetes have been examined. Coprinus atramentarius contains a distinct Nebenkern sphere, consisting of a large hyaline sphere, in which there are peripheral, chromophilic granules. This body is most distinct just before the meiotic division of the fusion nucleus occurs. It is probable that the sterigmatic bodies described by various workers, are derived from this Golgi apparatus, rather than from the centrosomes.
The Bearing Of Cambric Re-Definition Upon Iowa, Charles Keyes
The Bearing Of Cambric Re-Definition Upon Iowa, Charles Keyes
Proceedings of the Iowa Academy of Science
Recent necessary restriction of the stratigraphic span of the Cambric period to its original signification that is, with the trilobitic Paradexides zone as base, does not, fortunately, greatly disturb Iowa's Cambric classification, for the profound erosional conformity at the bottom may well be regarded, or not, as representing Early Cambric time. The Olenellus zone, or Early Cambric of Walcott, therefore, belongs not to the Paleozoic at all, but to the pre-Cambric, or rather Taconic period of the Proterozoic. Of course, Sedgwick's lowest Cambric strata, the Paradoxides-yielding horizon, rests upon old basement gneisses in the Wales region, with one of the …
A Study Of Conditions Affecting The Functioning Of The Art Appreciation Process At The Child-Level, Mildred Dow Voss
A Study Of Conditions Affecting The Functioning Of The Art Appreciation Process At The Child-Level, Mildred Dow Voss
Proceedings of the Iowa Academy of Science
The claim has been made in art psychology that sensitivity to such relationships as balance, rhythm, harmony, and unity is basic to discrimination of the best in art, or aesthetic judgment; to an understanding of the composition of a picture, or aesthetic analysis; and to the production of paintings of merit. To test this assumption a series of four experimental art courses was conducted to determine if an increase in the understanding of the principles of art through instruction would also bring about an increase in aesthetic judgment, analysis, and production.
A Preliminary List Of Some Families Of Iowa Insects, H. E. Jaques, L. G. Warren, Laurence K. Cutkomp, Herbert Knutson, Shirley Bagnall, Mabel Jaques, Dick D. Millspaugh, Verlin L. Wimp, W. C. Manning
A Preliminary List Of Some Families Of Iowa Insects, H. E. Jaques, L. G. Warren, Laurence K. Cutkomp, Herbert Knutson, Shirley Bagnall, Mabel Jaques, Dick D. Millspaugh, Verlin L. Wimp, W. C. Manning
Proceedings of the Iowa Academy of Science
For some ten years the Iowa Insect Survey has been collecting specimens and data from all parts of this state in a study of the geographic and seasonal distribution of the insects of Iowa. Comparatively little has been done heretofore with most of the families of the Hymenoptera and the Diptera of Iowa. With the hope of stimulating a more general interest in these groups, preliminary lists of the species now known to occur within the state are being submitted. Students in systematic Entomology in the college have taken a family and given it special attention in their collecting for …
Respiratory Activity Of Grasshopper Embryo As Contrasted With Intact Egg, Joseph Hall Bodine, Edgar J. Boell
Respiratory Activity Of Grasshopper Embryo As Contrasted With Intact Egg, Joseph Hall Bodine, Edgar J. Boell
Proceedings of the Iowa Academy of Science
An attempt has been made to localize the important respiring components of the grasshopper egg and to estimate the relative respiratory intensity of each.
Oxygen Consumption And Rates Of Dehydration Of Grasshopper Eggs (Orthoptera), Vincent Thompson, Joseph Hall Bodine
Oxygen Consumption And Rates Of Dehydration Of Grasshopper Eggs (Orthoptera), Vincent Thompson, Joseph Hall Bodine
Proceedings of the Iowa Academy of Science
The rate of water loss of Melanoplus differentialis eggs at different developmental stages has been determined. No qualitative difference in respect to rate was found between wet (hypertonic solutions) and dry (calcium chloride) dehydration. The resistance to desiccation decreases with morphological age of developing eggs. Diapause eggs are most resistant. The rate of desiccation does not seem to be closely associated with metabolic activity as represented by that fraction of the respiration which is dependent on structure, or which may he depressed by certain CO/O2 mixtures. Isolated embryos do not show qualitatively the same dehydration rate difference as do …
The Effect Of Carbon Dioxide On Nitrate Accumulation In Carrington Loam, F. B. Smith, P. E. Brown, H. C. Millar
The Effect Of Carbon Dioxide On Nitrate Accumulation In Carrington Loam, F. B. Smith, P. E. Brown, H. C. Millar
Proceedings of the Iowa Academy of Science
Most microorganisms obtain carbon as well as energy from the oxidation of organic compounds but the nitrifying bacteria assimilate carbon dioxide from the air as a source of carbon. The sulfur bacteria and the hydrogen oxidizing bacteria also assimilate carbon dioxide from the air. Other bacteria that cannot assimilate carbon dioxide from the air are greatly stimulated by its presence. Increasing the concentration of carbon dioxide in the air about cultures of Lactobacillus acidophilus produces higher plate counts and larger colonies than cultures in carbon dioxide-free air. An increased concentration of carbon dioxide in the soil air stimulates the growth …
The Rossi-Cholodny Technic As An Aid In The Study Of The Decomposition Of Lignin, H. H. Mollenhoff, F. B. Smith, P. E. Brown
The Rossi-Cholodny Technic As An Aid In The Study Of The Decomposition Of Lignin, H. H. Mollenhoff, F. B. Smith, P. E. Brown
Proceedings of the Iowa Academy of Science
The study of the soil microflora by direct microscopic examination offers the possibility of observing the activities of the microorganisms in their natural surroundings and the attention of soil microbiologists has been directed along this line from time to time. Rossi (4) and Cholodny (1) working independently proposed similar methods which yield results of a qualitative nature and their methods have come to be known as the Rossi-Cholodny technic. Recently, Conn (2 and 3), Winogradsky (6), and Ziemiecka (7) have contributed to the further development of the method, adapting it to laboratory conditions.
The Biota Of The Cedar River As Related To Odor And Taste Production, E. J. Petry
The Biota Of The Cedar River As Related To Odor And Taste Production, E. J. Petry
Proceedings of the Iowa Academy of Science
This paper presents a brief summary of surveys carried through the past two years, as an aid in the control of odor and taste in city water. So far as the writer is aware, no work of this kind has previously been done at Cedar Rapids, hence comparisons can only be drawn between the years covered, or amongst the months represented.
A Factor In The Distribution Of Minor Veins In Dicotyledon Leaves, Robert B. Wylie
A Factor In The Distribution Of Minor Veins In Dicotyledon Leaves, Robert B. Wylie
Proceedings of the Iowa Academy of Science
Critical survey of a wide series of foliage leaves shows a fairly close relation between mesopyll organization and intervascular distance. Among Dicotyledons there is a close correlation between relative amount of leaf tissue that is horizontally arranged in the blade in comparison with that having cells elongated at right angles to the epidermis.
Green Plants And The Reactions Of Iron, Norman Ashwell Clark
Green Plants And The Reactions Of Iron, Norman Ashwell Clark
Proceedings of the Iowa Academy of Science
In several of its aspects the problem of the availability of iron for plants is still unsolved. If the problem is not unique, it is at least unusual. In general, the plant takes its elements in simple combinations - almost, the simpler the better. Phosphorus is picked up as phosphate, nitrogen as nitrate or ammonia, sulphur as sulphate, and metals can be given as salts - nitrates, sulphates and chlorides. But try putting ferric chloride into a nutrient solution with a reaction around the neutral point! The plant turns yellow; the leaves become chlorotic, and there are all the indications …
Growth Promoting Ability Of D- And L-Lysine, Clarence P. Berg
Growth Promoting Ability Of D- And L-Lysine, Clarence P. Berg
Proceedings of the Iowa Academy of Science
We have previously reported work on the influence of optical isomerism on the utilization of essential amino acids for growth. As an extension of this program we have devised a method for the resolution of di-lysine and have fed the d and the l modifications to rats as supplements to diets deficient in lysine, but otherwise complete. The unnatural l-lysine proved to be unable to stimulate growth. In this respect it is like the unnatural modification (d) of cystine, but differs from the unnatural isomers of tryptophane (d) and histidine (d).
Antioxidants And The Autoxidation Of Fats V. Mode Of Action Of Anti- And Pro-Oxidants, L. A. Hamilton, H. S. Olcott
Antioxidants And The Autoxidation Of Fats V. Mode Of Action Of Anti- And Pro-Oxidants, L. A. Hamilton, H. S. Olcott
Proceedings of the Iowa Academy of Science
Experiments on the oxidation of purified methyl oleate support the view that its induction period, and probably that of natural oils, is due to the presence of inhibitors and that purified unsaturated compounds have no induction period, other than the time required for gaseous oxygen to diffuse into the liquid.
The Friedel-Crafts Reaction With Furans, M. Mccorkle, J. A. V. Turck Jr.
The Friedel-Crafts Reaction With Furans, M. Mccorkle, J. A. V. Turck Jr.
Proceedings of the Iowa Academy of Science
2-Furoic acid, aluminum chloride and substituted benzenes give 6-substituted-l-naphthoic acids. For example, with chlorobenzene the product is 6-chloro-1-naphthoic acid; with anisole, 6-methoxy-1-naphthoic acid; with toluene, 6-methyl-1-naphthoic acid.
Effects Of Catalysts On The Preparation And Properties Of Organometallic Compounds, M. Lichtenwalter, J. C. Bailie, A. J. Carter
Effects Of Catalysts On The Preparation And Properties Of Organometallic Compounds, M. Lichtenwalter, J. C. Bailie, A. J. Carter
Proceedings of the Iowa Academy of Science
It has been shown that the formation of RM compounds can be accelerated photochemically and by the use of varying quantities of selected reagents. Also, the rates of reaction between RM compounds and various reactants can be accelerated by small quantities of catalysts like cuprous chloride. For example, the time required for complete interaction of benzonitrile and phenylmagnesium bromide is reduced significantly by the addition of small amounts of compounds like cuprous chloride. It appears that these particular catalysts function by first forming very unstable organometallic compounds like phenylcopper, in the case mentioned. Then the phenylcopper decomposes to give copper …
Deciphering An Earthquake Message, M. M. Seeburger
Deciphering An Earthquake Message, M. M. Seeburger
Proceedings of the Iowa Academy of Science
An explanation of methods used to determine instrumentally the exact epicentre of an earthquake, also the depth of focus and the acceleration. The use of seismograms to determine (1) typical period of earthquakes in seismic areas, (2) discontinuities in the earth's interior. Strong motion seismograms as an aid to engineers in designing earthquake-proof buildings, bridges and dams.