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The Relative Discriminability Of Twelve Random Shapes, L. E. Carver, Marilyn E. Marshall

Proceedings of the Iowa Academy of Science

From twelve randomly derived visual shapes, six were to be chosen, if possible, which were mutually equally discriminable. The chosen six were subsequently to be used as stimuli in a verbal-motor transfer task. The two members of all possible pairs of the twelve shapes, including "same" pairs, were presented in succession by means of an automatic slide projector, the exposure time for each member being .25 sec. "Same" or "different" judgments made by 12 subjects after the presentation of each pair, were 98% correct, making useful differentiation among the 12 shapes impossible. Difficulty of discrimination was increased by presenting the …

Conservation Of Geologic Features In Iowa, C. S. Gwynne

Proceedings of the Iowa Academy of Science

It is suggested that attention be given to the following geologic features as possible subjects for recognition or preservation or protection: glacial erratics unique for size, shape, or composition; type sections or localities in the bedrock; falls; springs; fossil or geode collecting areas; areas of natural outcrops of all bedrock formations of the state.

Evaluation Of Ʃcot X Sin 2mx In(Sin X/Sina)Dx, Etc., Don Kirkham

Proceedings of the Iowa Academy of Science

For m = 1,2,... the following indefinite integrals are evaluated

⌠cot x sin 2mx dx, ⌠tan x sin 2mx dx,

⌠cot 2x sin 2mx dx, ⌠2 csc 2x sin 2mx dx,

⌠cot x sin 2mx ln(sin x/sin a)dx, ⌠tan x sin 2mx ln(sin x/sin a)dx,

2⌠cot 2x sin 2mx ln (sin x/ sin a) dx, 2 ⌠csc 2x sin 2mx ln (sin x/ sin a) dx.

Also, formulas are given for the last four expressions where f(x) replaces ln(sin x/sin a). Further, procedures for evaluating the above expressions are outlined when …

Liquid Level Sensor, John M. Munson

Proceedings of the Iowa Academy of Science

There exists a serious need for a continuous liquid level sensing device for use in cryogenic liquids. An optical probe that will emit an amount of light directly proportional to the height of liquid in a Dewar is described. The optical output signal of the probe will be changed to an electrical signal by means of a photocell or a phototransistor.

The Design Of Inexpensive Plant Growth Chambers, D. C. Foley, J. C. Horton

Proceedings of the Iowa Academy of Science

Inexpensive plant growth chambers can be built from standard components manufactured for other purposes. A working unit 6' x 6' in size assembled from a refrigerated meat storage box and general line fluorescent lamps is described. Light intensities up to 1800 ft-c at one foot and temperatures, with full light load, down to 8 ° C can be maintained.

The Effect Of Variety And Depth Of Sowing On Depth Of Secondary Root Zone In Oats, P. L. Rodgers

Proceedings of the Iowa Academy of Science

Secondary roots are generally initiated approximately 2 cm below the soil surface regardless of whether the seeds are sown at that depth or deeper. In one experiment, conducted in the greenhouse in January, the seedlings established secondary roots between 1 and 2 cm below the soil surface, even when the seeds were planted 7.5 cm deep. In an identically conducted experiment in April, the zone of secondary root initiation was directly related to depth of planting with some being as deep as 4.6 cm. The environmental factors which were variable between the 2 experiments were photoperiod and temperature. All 5 …

An Experimental Comparison Of Associative Responses To Two Types Of Randomly Derived Stimuli, George G. Karas, Sheldon K. Edelman, Richard J. Farrell, Thomas E. Dubois

Proceedings of the Iowa Academy of Science

Two methods for constructing random shapes were compared as to their effect upon latency of the associative response. Attneave and Arnoult had hypothesized that their Method II shapes would contain less stimulus information than would their Method I shapes. In the present study this hypothesis was substantiated only for female subjects. It was concluded that a reduction in stimulus information could not alone account for these results and that subject variables such as set and response threshold variability, must be included in the interpretation of results.

Midwest, Volume 4, Number 2, Spring 1961 [Download Entire Issue]

Midwest: A Literary Review

No abstract provided.

One Inch Taller, Shirley Pace

Midwest: A Literary Review

No abstract provided.

Three Heads, Barbara Sanborn

Midwest: A Literary Review

No abstract provided.

Relationship Between The California Bearing Ratio And The Unconfined Compressive Strength Of Sand-Cement Mixtures, C. A. O'Flaherty, H. T. David, D. T. Davidson

Proceedings of the Iowa Academy of Science

This investigation showed that a true functional relationship, valid over a wide range of experimental conditions, does not exist between the results obtained by two methods of evaluating the strength of a cement-treated sandy soil. These two methods are the California Bearing Ratio test and the unconfined compressive strength test. However the equation, log CBR = 1.115 + 0.660 log UCS, can be used as a working relationship between the two tests under varying experimental conditions. It was concluded that a true functional relationship likely does exist for a given experimental condition, i.e., where only one experimental condition varied at …

Annual Report Of The Registrar 1960-61, University Of Northern Iowa

Institutional Effectiveness & Planning Documents

Contents:

--- Comparisons Worth Noting
--- Summary of Attendance
--- Attendance by Sessions
--- Degrees Granted
--- Summary of Veterans Attendance
--- Pupils in Price and Affiliated School

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

Reports - The Board Of Directors; Financial Statement; Staff Reports; Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

Proceedings Of The Seventy-Third Meeting Of The Iowa Academy Of Science Held At Simpson College, Indianola, April 14 And 15, 1961: Minutes Of The 1961 Meeting

Proceedings of the Iowa Academy of Science

No abstract provided.

Problems In The Use Of Plant Growth Chambers, J. C. Horton, D. C. Foley

Proceedings of the Iowa Academy of Science

Plant growth chambers cannot duplicate all of the intricacies of continually changing environments, but properly designed chambers can produce daily and hourly changes in light and temperature with reasonable precision. Gradient, the most objectionable type of temperature variation, can be minimized by increasing air circulation and removing lamp heat as quickly as possible. Bulb age and temperature influence light intensity.

Organization Of The Centroplasm In Nostoc Pruniforme, T. E. Jensen, C. C. Bowen

Proceedings of the Iowa Academy of Science

Electron micrographs of thin sections of Nostoc pruniforme fixed in KMnO₄ and embedded in Epon consistently revealed structure in the centroplasrn. Organization of the continuous phase, as well as several kinds of included bodies, are described. Elongate structures with highly ordered, fine, lamellae stacked normal to the long axis were the most striking objects observed.

Genetic Effects In The Control Of Floral Abscission In Nicotiana, Robert E. Yager

Proceedings of the Iowa Academy of Science

Lizard's Tail and Little Turkish varieties vary considerably as to time for floral abscission, anatomy of the abscission zone, and the controlling chemical agents. When the two varieties are crossed, a homogeneous F₁ generation is intermediate in anatomical characteristics and time required for abscission of unfertilized flowers. The F₂ individuals are widely heterogeneous. External anatomy and time of abscission vary considerably and in some instances are unlike either parental type or the F₁ offspring. Simple laws of genetics do not apply to the genetic effects upon floral abscission in these varieties. Multiple genes appear to be involved, …

Fusarium Blight Of Soybeans, John Dunleavy

Proceedings of the Iowa Academy of Science

Fusarium orthoceras produced necrosis of succulent root tissues of soybean seedlings and infected tips of lateral roots of older plants. Pods and seeds were most susceptible to fungus penetration after maturity. High relative humidity was necessary for infection of seeds. Maximum stand reduction and yield loss under field conditions were obtained when seeds were sown in Fusarium-contaminated soil before rains. In a greenhouse the disease was most destructive when plants were grown in soil at 100-percent water-holding capacity at 21° C. The disease was less damaging to plants grown in soil at the same moisture level at 27°. Seedlings grown …

Seed Weight As A Measure Of Response Of Oats To Crown Rust Infection, M. D. Simons, J. A. Browning

Proceedings of the Iowa Academy of Science

Average seed weight, as determined by samples consisting of 100 seeds, was significantly correlated with yield and bushel weight in fungicide and varietal response trials. In one fungicide trial seed weight was a more sensitive measure of rust control than yield or bushel weight. In varietal trials seed weight response to the crown rust fungus of oats grown in hill plots was significantly correlated with yield response in 32-square-foot plots.

Testing Oats In The Field With Specific Races Of Crown Rust, M. D. Simons

Proceedings of the Iowa Academy of Science

Different methods of testing were compared under field conditions. Inoculation procedures in which rust spores were applied directly to the plants were generally not as satisfactory as procedures in which highly susceptible rust-spreader plants were inoculated heavily early in the season. Certain strains of oats were shown to be resistant to two of the races of crown rust used and susceptible to the third. Other strains were resistant to all three races.

Algae From The Warm Pools Of Silver Lake Fen, Keturah Gashwiler, John D. Dodd

Proceedings of the Iowa Academy of Science

A description of the physical features, including a chemical water analysis, is given. Collections were made during the summer of 1959 and comprise a list of 23 species of algae.

Hill Prairies Within The City Of Dubuque, Iowa, Howard W. Hintz

Proceedings of the Iowa Academy of Science

Strips of prairie several hundred feet wide cover certain uninhabitable hillsides within the city. Three major strips comprise a total length of about two miles. They support a varied flora. Parts of the area are often burned, but grazing has been absent for half a century. Exact locations are given, and brief notes on some of the flowering plants and insects are included.

Control Of Herbaceous Vegetation In Forest Plantings, Emerson W. Pruett, Gordon E. Gatherum

Proceedings of the Iowa Academy of Science

Chemical and mechanical methods of reducing herbaceous competition within tree plantings on three Iowa soil types were studied. Treatments included Garlon, Esteron-Dowpon, Simazin, Chloro IPC, Mylone, Vapam, disking, mowing, cultivation, and check. Survival and height growth of jack pine, white pine, cottonwood, and black walnut were determined for each method of control. Available light and soil moisture were also determined within each treatment as supplementary measures of the success of competition control. Tree seedling survival and height growth varied somewhat among treatments from soil type to soil type. However, survival and height growth were generally greatest on the cultivated plots …

A New Sensitive Reagent For The Spectrophotometric Determination Of Copper, H. Weldon Baker, Ronald T. Pflaum

Proceedings of the Iowa Academy of Science

N,N'-bis(β-1-piperazylethyl) dithiooxamide forms soluble, colored chelates with a number of the transition metal ions. This reagent might have several advantages over other substituted dithiooxamides, since both it and the chelates are water soluble. In solution the reagent acts as a dihydroxy base, deriving its basicity from the presence of the substituent piperazine rings. Potentiometric titration with hydrochloric acid yielded K₁= 1.70 x 10^-5 and K2 = 1.14 x 10^-5 for the two basic dissociation constants. In the presence of copper (II) ion this reagent forms two chelate species which were determined absorptimetrically to have the compositions …

Effect Of Negative Ions Upon Rates Of Reaction Of Zinc With Hydrochloric And Perchloric Acids, Joe D. Woods, Thomas J. Rider

Proceedings of the Iowa Academy of Science

The rate of evolution of hydrogen by the action hydrochloric acid and perchloric acid on zinc was measured volumetrically as a function of various negative ion concentrations. Increasing zinc ion concentration retards the rate of the reaction. A four to one ratio of chloride to zinc ion reaccelerates the rate, suggesting the formation of Zn Cl₄^-- which removes the excess zinc ion from the reaction. Other complexing ions, thiocyanate, bromide and iodide ion, accelerate the reaction as does chloride. Sulfate, like perchlorate, has little effect. The results explain the fact that hydrochloric acid reacts with zinc at a …

Modification Of A Potentiometer Recorder For Polarographic Purposes, William C. Oekle

Proceedings of the Iowa Academy of Science

A Bristol Model 560 Dynamaster potentiometric strip chart recorder (microvolts vs time) was modified so as to automatically produce polarographic traces of milliamperes versus voltage. This was accomplished by adding suitable gearing and transmission elements to the chart drive so as to turn a 360° precision instrument type potentiometer. This potentiometer was used to vary the voltage impressed upon the polarographic electrodes in the customary manner. The current, produced by this voltage across the dropping mercury electrode, was passed through a precision resistor and the voltage drop across this shunt resistor was fed back into the regular input of the …

Some Observations On The Handling Of Adams' Platinum-Oxide Hydrogenation Catalyst, Lyman R. Caswell, Robert D. Schuetz

Proceedings of the Iowa Academy of Science

Two problems are present in the measurement of the exact quantities of catalyst used in hydrogenations with platinum oxide. The first arises from the fact that platinum oxide is highly adsorbent and rapidly gains weight due to adsorption of atmospheric components when it is exposed to air. A procedure is described for making an approximate correction for this weight gain. The second problem is the identity of the actual catalytic material. The observations indicate that this is platinum metal, and it is shown that the platinum content varies with the batch of catalyst.

Electrophoretic Analysis Of The Proteins Of Body Fluids In Various Disease States, J. I. Routh, W. D. Paul

Proceedings of the Iowa Academy of Science

Plasma, serum, and body fluid specimens (pleural fluid, ascitic fluid, synovial fluid, edema fluid, hydrocele fluid, cyst fluid, lymph, bile, and subdural fluid) from patients with heart disease, carcinoma, liver disease, and arthritis, were subjected to electrophoretic analysis. A decrease in plasma albumin and an increase in globulin components occurred in the disease conditions. In most instances the albumin and gamma globulin were higher, the α₁ globulin the same, and the α₂ and β globulin and fibrinogen in lower concentration in the fluid than in the corresponding plasma specimen. The distribution of the protein components between the plasma …