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Articles 6661 - 6690 of 7391
Full-Text Articles in Entire DC Network
Reports: Executive Committee; Secretary; Treasurer; Staff Reports; Committee Reports
Reports: Executive Committee; Secretary; Treasurer; Staff Reports; Committee Reports
Proceedings of the Iowa Academy of Science
No abstract provided.
The Organization Of An Academy, Joseph C, Gilman
The Organization Of An Academy, Joseph C, Gilman
Proceedings of the Iowa Academy of Science
The Academy Conference of the American Association for the Advancement of Science is the one place in which representatives of the state academies meet for discussion of their common interests and problems. Since in the past ten years other immediate needs have held its attention, no discussion of the ever present problem of the methods of attaining its objectives has been presented, hence the present subject: - the organization of an academy-was chosen for discussion. As qualifications for presenting this material, the experiences during the past ten years as secretary of the Iowa Academy of Science and also the representative …
The Address Of The President: Science And Progress, R. B. Mcclenon
The Address Of The President: Science And Progress, R. B. Mcclenon
Proceedings of the Iowa Academy of Science
Science and human welfare have always risen and fallen together. We find this generalization borne out in all recorded history, and even farther back in the dim horizons of prehistory. From the first attempts at counting and measuring, observation of the precision of the periodic recurrence of the seasons, forging of metal tools and weapons, domestication of animals, planting and harvesting of crops, we see that the slow advance of the status of man in his world has been accompanied or even preceded by the advance in science. In the earlier stages, of course, we find art, culture, and the …
A "Twin-Embryo" Abnormality In Maize, John E. Sass, George F. Sprague
A "Twin-Embryo" Abnormality In Maize, John E. Sass, George F. Sprague
Proceedings of the Iowa Academy of Science
A mutant strain of corn obtained by ultra violet treatment has twin growing points in the embryo. The flattened emerging coleoptile is a continuous sheath, containing two distinct stem apices, each of which lays down a series of leaf primordia. Each growing point becomes encircled by its laterally overlapping young leaves. The procambium strands of the two young axes converge into the stele of the mesocotyl (first internode), which is common to the two potential stems.
Ammonia And Organic Nitrogen Determinations In Stream Pollutions Studies, Jack J. Hinman Jr., W. Keith Weeber, R. Rupert Kountz
Ammonia And Organic Nitrogen Determinations In Stream Pollutions Studies, Jack J. Hinman Jr., W. Keith Weeber, R. Rupert Kountz
Proceedings of the Iowa Academy of Science
Determinations of ammonia in water supplies go back to the time of Chevreul in 1811. Titration procedures for the estimation of the substance were worked out by Boussingault (2), Bineau (1) and Thompson (9) during the 18SO's. And there are already numerous modifications of the method for the estimation of total organic nitrogen developed by Johann Kjelclahl (6) in the Carlsberg Laboratory, in Copenhagen, in 1883. It is not meant to imply, by the title given this paper that basically new and original methods for the determination of nitrogen as ammonia or in its organic compounds are to be presented. …
A Preliminary List Of The Crane Flies (Diptera: Tipulidae) Of Iowa, Orville Halvorson, H. E. Jaques
A Preliminary List Of The Crane Flies (Diptera: Tipulidae) Of Iowa, Orville Halvorson, H. E. Jaques
Proceedings of the Iowa Academy of Science
The members of the family Tipulidae are commonly called "Crane flies." They have slender bodies, long slim wings, prominent halteres and long dangling legs. The legs break so readily between the trochanter and femur that it becomes a difficult problem to collect these insects and get them mounted in good condition. 1 This brittleness might almost be made a character for determination of the family. The antennae are long and slim and are composed of from six to thirty-nine jointed segments. The eyes are large and the ocelli are wanting. In size the various species show a range almost as …
Studies Of Eastern Iowa Spiders, Karl A. Stiles, Virginia G. Stevens
Studies Of Eastern Iowa Spiders, Karl A. Stiles, Virginia G. Stevens
Proceedings of the Iowa Academy of Science
The spiders of Eastern Iowa included in this study constitute a part of a general geographical and seasonal survey of the spiders of Iowa. The majority of them have been collected by the authors, although much assistance has been given by others.1 For the first time some spiders have been collected from the woodland floor by the sifting of dead leaves and other debris. Most of them have been found in Linn County, but there are also species from Wapello, Henry, Muscatine, Pottawattamie, Black Hawk, Clayton, Louisa, and Washington counties. Of the ninety-four different spiders here reported, thirty-five species …
A List Of The Leaf Hoppers (Cicadellidea) In The Iowa Insect Survey Collection, Carroll Padley
A List Of The Leaf Hoppers (Cicadellidea) In The Iowa Insect Survey Collection, Carroll Padley
Proceedings of the Iowa Academy of Science
The homopterous family, Cicadellidae, may be distinguished from its closely related allies the Membracidae and Cercopidae by the presence of a double row of spines on the hind tibiae. The leafhoppers are popularly known as pests of grains and grasses, but their injury is by no means confined to these crops, for there is scarcely a plant of agricultural importance that is not seriously injured by them. Many species rank high as garden, orchard, and vineyard pests. The nature of their injury is loss of sap, destruction of chlorophyll, serious contortions of foliage, and the transmission of plant diseases. By …
Lead Poisoning In Ducks Of Southwestern Iowa During The Winter Of 1938-39, Bruce F. Stiles
Lead Poisoning In Ducks Of Southwestern Iowa During The Winter Of 1938-39, Bruce F. Stiles
Proceedings of the Iowa Academy of Science
Lead poisoning in ducks is caused from leaden pellets of shot in the gizzard. These are picked up with other particles of grit from the marginal shallows of water, in areas that have been shot over by hunters. A paralysis of the gizzard and that part of the digestive tract just in front of it, prevents food from passing through the body. The bird wastes away from starvation and becomes so emaciated that it is literally skin and bones. It is possible that some of the more vigorous birds are able to carry the lead shot and survive. Many of …
Some Abnormalities Of A Pair Of Siamese Twin Lambs, Carroll Padley, James Shipley
Some Abnormalities Of A Pair Of Siamese Twin Lambs, Carroll Padley, James Shipley
Proceedings of the Iowa Academy of Science
An interesting problem in the study of anatomy was presented by a pair of Siamese lambs recently brought to our laboratory. The lambs were from a Shropshire ewe that had given birth to normally developed twins the previous season. The Siamese lambs were delivered with much difficulty and as a consequence, they were damaged at the region of fusion causing an internal disruption of their organs. Although the lambs were alive immediately after delivery, the damage to their organs brought death within a few minutes.
Objective Studies Of Electrification In Mirotechnique, Karl A. Stiles, Douglas W. Eastwood
Objective Studies Of Electrification In Mirotechnique, Karl A. Stiles, Douglas W. Eastwood
Proceedings of the Iowa Academy of Science
Tests have been made on the amount of electrification that 1s present when tissues are sectioned with a rotary microtome. An aluminum foil electroscope with carefully controlled conditions gave the following results. Radium, ultra-violet radiation, and spark discharges lowered the electrification to a negligible amount. Grounding the microtome, or draping it with Christmas tree tinsel had no measureable effect. Humidification of the surrounding air in several tests lowered the amount of electrification, but was too inconvenient to be practical. The best results were obtained by modification of the imbedding medium. Of eighteen different imbedding mediums, diglycol stearate, sold by the …
Summer Quarter Commencement [Program], August 24, 1939, Iowa State Teachers College
Summer Quarter Commencement [Program], August 24, 1939, Iowa State Teachers College
UNI Commencement Programs
The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.
Spring Quarter Commencement [Program], May 29, 1939, Iowa State Teachers College
Spring Quarter Commencement [Program], May 29, 1939, Iowa State Teachers College
UNI Commencement Programs
The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.
Fifty-Third Annual Meeting Of The Iowa Academy Of Science And The Eighth Annual Convention Of The Junior Academy Of Science Of Iowa, April 21 And 22, 1939, Iowa Academy Of Science
Fifty-Third Annual Meeting Of The Iowa Academy Of Science And The Eighth Annual Convention Of The Junior Academy Of Science Of Iowa, April 21 And 22, 1939, Iowa Academy Of Science
Iowa Academy of Science Documents
No abstract provided.
Iowa State Teachers College Schedule Of Classes, Fall/Winter/Spring, 1938-39, Iowa State Teachers College
Iowa State Teachers College Schedule Of Classes, Fall/Winter/Spring, 1938-39, Iowa State Teachers College
UNI Schedule of Classes
A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.
The Alumnus, V23n2, April 1939, Iowa State Teachers College
The Alumnus, V23n2, April 1939, Iowa State Teachers College
The Alumnus
Inside This Issue:
-- The Campus Parade
-- Attack on the Land of Gibberish
-- Edward Kurtz Composes a Symphony
-- Rebuilding Broken Lives
-- Invitation to Reunion
-- The Prowl...
-- Patriots? Dictators? Or Classroom Robots?
-- Alumni News
-- Marriages
-- Births
-- Deaths
-- For Three Cents You Can Tell Us
-- An Alumni Calendar of Events
Hake Sketches In Charcoal At Forum, The College Eye, March 17, 1939
Hake Sketches In Charcoal At Forum, The College Eye, March 17, 1939
Noteworthy People of UNI Documents
Herbert V. Hake attended graduate school at the University of Iowa, where he earned his master's degree in scenic design in 1933. In the summer of 1936, he began his career at the Iowa State Teachers College (ISTC) with the Theater Department. From 1938 to 1942 he served as technical director, scenic designer, and instructor of speech courses. He was a pioneer in radio and television.
The Distribution Of Zooplankton In Lake Okoboji, Malcolm Mcdonald
The Distribution Of Zooplankton In Lake Okoboji, Malcolm Mcdonald
Proceedings of the Iowa Academy of Science
During the past several summers a series of chemical and physical measurements have been made on Lake Okoboji by staff members of the Lakeside Laboratory. This is a continuation of work begun many years ago. In the summer of 1938 an attempt was made to study the relationship between the distribution of zooplankton and chemical and physical changes. During the period June 30 to August 24 collections were made every two or three days from two stations in West Okoboji and one in East Okoboji Lake. Each collection consisted of a series of ten-liter samples pumped from various depths, concentrated …
1939 Old Gold, Iowa State Teachers College
1939 Old Gold, Iowa State Teachers College
UNI Yearbooks
The student yearbook of the Iowa State Teachers College, later known as the University of Northern Iowa.
Significance Of Carboniferous And Late Devonian Material Within The Iowa Devonian, S. W. Stookey
Significance Of Carboniferous And Late Devonian Material Within The Iowa Devonian, S. W. Stookey
Proceedings of the Iowa Academy of Science
It is a well-known characteristic of the Devonian limestones that to an extraordinary degree they have been affected by the destructive work of percolating water through solution. This is, no doubt, in part accounted for by the comparative purity of these limestones. The chemical process of dolomitization which is characteristic of the Silurian beds is here at a minimum, and rapid solution by meteoric waters has been the result. It is apparent also that the diastrophic movements that have affected the Devonian terranes have facilitated this destructive process. Wherever there are exposures of these beds, either natural or artificial, the …
The Oxidizable Organic Matter And Organic Nitrogen Content Of The Okoboji Lakes, A. Gray Adamson, Theodore L. Jahn
The Oxidizable Organic Matter And Organic Nitrogen Content Of The Okoboji Lakes, A. Gray Adamson, Theodore L. Jahn
Proceedings of the Iowa Academy of Science
The amount of dissolved organic material which is present in a lake may be used as an index of the amount of food available for growth of micro-organisms, and is therefore of importance in studying the biological productivity of any given body of water. The purpose of this investigation was to determine the amount and distribution of organic matter in the Okoboji Lakes. This was studied as a function of depth below the surface and also as a function of the particle size of the organic material, that is, whether the material could be considered as net plankton, nannoplankton, or …
In Memoriam: John Budd Wentz; Arthur Alfred Bryan, H. D. Hughs, A. A. Bryan, Frederick D. Richey
In Memoriam: John Budd Wentz; Arthur Alfred Bryan, H. D. Hughs, A. A. Bryan, Frederick D. Richey
Proceedings of the Iowa Academy of Science
No abstract provided.
Iowa's Contribution To American Men Of Science, H. E. Zabel
Iowa's Contribution To American Men Of Science, H. E. Zabel
Proceedings of the Iowa Academy of Science
The latest edition of the Biographical Directory of Scientists lists 2623 who are now in Iowa or were formerly here. For every twenty-one of the present North American scientists, two are or were Iowans. Of these Iowans, 1110 were born in Iowa. Only six states have a larger number of native scientists. Of the outstanding or "starred" scientists, fifty-nine are native Iowans, a number exceeded by only five states. There is a native Iowa scientist for every 2275 of Iowa's present population, a ratio exceeded only by two states, each with a much smaller population, namely, Vermont and Utah.
Technique Of Radiography With Soft X-Rays, F. M. Bailey
Technique Of Radiography With Soft X-Rays, F. M. Bailey
Proceedings of the Iowa Academy of Science
The soft x-ray apparatus which was developed has been applied to the radiography of small biological specimens and other material requiring long wavelengths to produce sufficient contrast. Stereoscopic technique has also been used in order to provide three dimensional views of specimens.
The Magic Eye - A Demonstration Experiment, E. Hobart Collins
The Magic Eye - A Demonstration Experiment, E. Hobart Collins
Proceedings of the Iowa Academy of Science
The soft x-ray apparatus which was developed has been applied to the radiography of small biological specimens and other material requiring long wavelengths to produce sufficient contrast. Stereoscopic technique has also been used in order to provide three dimensional views of specimens.
Tree Study Keys, Ida E. Iversen-Wolden
Tree Study Keys, Ida E. Iversen-Wolden
Proceedings of the Iowa Academy of Science
"Our Trees" by Professor H. S. Conard, Grinnell College, was used in the Mason City junior college biology in its first tree study of that city with its surrounding area. In the laboratory class study of the early fall, students were directed in the use of the "key." Later each one was responsible for the study of trees on his home lot, or an equivalent territory, collecting, pressing, mounting, labeling, and giving tree locations. Next, each student mapped his home block, adding to the leaf collections, and tree locations. Material was thus collected not only from Mason City hut from …
The Biological Action Of Rotenone On The Lake Fauna, Howard L. Hamilton
The Biological Action Of Rotenone On The Lake Fauna, Howard L. Hamilton
Proceedings of the Iowa Academy of Science
The powdered root of Derris elliptica, which contains the alkaloid, rotenone, has long been used by the natives of tropical countries as a fish and arrow poison. Recently it has been introduced in this country as an insecticide, and is being used by conservation workers to remove rough fish from waters which are to be stocked with game fish. Little or no consideration has been given to the possibility that the poison might kill other members of a lake fauna (thus breaking the food chain) and seriously affect the survival of any fish with which the waters might he restocked. …