Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

University of Northern Iowa

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 25651 - 25680 of 35992

Full-Text Articles in Entire DC Network

The Bedrock Configuration Of Iowa, Lyle V. A. Sendlein Jan 1968

The Bedrock Configuration Of Iowa, Lyle V. A. Sendlein

Proceedings of the Iowa Academy of Science

A review of bedrock topographic mapping of Iowa indicates that less than half of the state has been mapped. A map compiled primarily from the published literature of the bedrock configuration of Iowa and segments of the adjacent states of Minnesota, Illinois, Missouri and Nebraska suggests that the bedrock valley pattern parallels modern drainage as hypothesized by Kay and Apfel, in 1928. An unpublished map by Hale (1950) captured major valley trends remarkably well for the limited amount of data available. Studies of the bedrock surface by the United States Geological Survey in cooperation with the Iowa Geological Survey and …

Go to article

Visual Information Coding By Nerve Impulse Patterns, D R. T. Walker, N. R. Carlson, S. S. Fox Jan 1968

Visual Information Coding By Nerve Impulse Patterns, D R. T. Walker, N. R. Carlson, S. S. Fox

Proceedings of the Iowa Academy of Science

Microelectrode recordings of single cells were obtained from the visual cortices of twenty acutely prepared curarized cats. A 500 msec light stimulus was presented for 150 trials at inter-flash intervals of 1.3, 2.0, 2.5, 3.2 and 4.0 seconds. The post stimulus time histograms of cells responding with an accelerated firing to stimulus onset encoded the inter-stimulus interval by an increased firing during the second of three 166 msec periods during the stimulus. The firing at light offset and after did not encode inter-stimulus intervals.

Go to article

Discrimination Weighting On A Multiple Choice Exam, Timothy J. Gannon, Thomas Sannito Jan 1968

Discrimination Weighting On A Multiple Choice Exam, Timothy J. Gannon, Thomas Sannito

Proceedings of the Iowa Academy of Science

A multiple choice test (59 items) was given to 141 sophomore males as a final examination in General Psychology. The students were required to indicate their degree of confidence on each item by writing to the left of their answer a 1 (pure guess), a 2 (some guessing-some certainty), or a 3 (complete certainty). The scoring involved making the confidence values positive or negative according to whether the selected answers were correct or incorrect. Three scoring procedures were then compared by correlation techniques to determine if there were any major shifts in student ranking. It was found that by scoring …

Go to article

A Comparison Of Two Vannella Species, Robert F. Mote Jan 1968

A Comparison Of Two Vannella Species, Robert F. Mote

Proceedings of the Iowa Academy of Science

Two species of Vannella from a freshwater pond were cultured in distilled water, alfalfa, rice medium and described. Both species had a cyst form, radiate form, and trophic form. One, Vannella multimorpha sp. nov., was distinct in that large uni- and bi-nucleated Vannella were formed during the life cycle. From the large trophic Vannella multimorpha small amoebae buds were developed. Illustrations of the life cycle and microphotographs of this new species are represented.

Go to article

Some Coelozoic Myxosporida From New Zealand Fishes Ii. On A New Genus Of Myxosporida, Auerhachia, Paul A. Meglitsch Jan 1968

Some Coelozoic Myxosporida From New Zealand Fishes Ii. On A New Genus Of Myxosporida, Auerhachia, Paul A. Meglitsch

Proceedings of the Iowa Academy of Science

Auerbachia, a new genus of Myxosporida, is characterized. Two new species, belonging to this genus, are described. Auerbachia anomald n. sp. is reported from the gall bladder of Genypterus blacodes, and Auerbachia monstrosa n. sp. from the gall bladder of Coelorhynchus australis. All infected hosts were taken by trawler working out of Wellington, New Zealand.

Go to article

Application Of Cost And Value Comparisons To Iowa Wildlife, Harlan D. Cook Jan 1968

Application Of Cost And Value Comparisons To Iowa Wildlife, Harlan D. Cook

Proceedings of the Iowa Academy of Science

There is an increasing demand for methods to determine wildlife values and costs in order to allow comparisons with marketed goods which compete with wildlife for funds and resources. For relatively small changes in the total wildlife supply, estimation of the value of this increment in supply should be compared with the associated costs for the increment in supply. Statewide average values and costs are usually meaningless in this type of comparison. It is advocated that better estimates of changes in wildlife abundance caused by government and private activities will provide much useful information even with the limited economic information …

Go to article

Distribution And Habitat Of The Red Squirrel, Tamiasciurus Hudsonicus, In The North Central States, G. Robert Lynch, G. Edgar Folk Jr. Jan 1968

Distribution And Habitat Of The Red Squirrel, Tamiasciurus Hudsonicus, In The North Central States, G. Robert Lynch, G. Edgar Folk Jr.

Proceedings of the Iowa Academy of Science

A survey of the distribution and habitat of the red squirrel (Tamiasciurus hudsonicus) was conducted in northern Iowa, southern Minnesota, and Wisconsin. The results indicate that the present range of the red squirrel in Iowa covers the north central counties of the state, and is considerably smaller than that given in earlier surveys. The Iowa red squirrel lives in immature hardwood forests near rivers and lakes. If mature trees arc present, they are used for nesting and caching food. The preferred foods of the Iowa red squirrel are the black walnut (Juglans nigra) and the butternut (Juglans cinerea). In Wisconsin …

Go to article

Effect Of Multiple Medication On Hemoglohlin Content In Tranquilized Mice, Lester C. Shell, G. Dixon, T. Wyne, C. Nordstrom, J. Augustine, J. Heynen Jan 1968

Effect Of Multiple Medication On Hemoglohlin Content In Tranquilized Mice, Lester C. Shell, G. Dixon, T. Wyne, C. Nordstrom, J. Augustine, J. Heynen

Proceedings of the Iowa Academy of Science

Varying doses of medication were given tranquilized white mice. The hemoglobin content was measured by means of a Spectronic 20 colorimeter, using the Cannan chemical technique, with percent transmittance from colorimeter reading plotted against concentration grams per hemoglobin per 100 ml. blood of the standard. Comparison of length of medication, dosage, sex of animals, age of animals, and length of time on tranquilizer before medication was started recorded. Included in medication were varying amounts of sex hormones, and effects noted.

Go to article

Physiological Observations On Raccoons In Winter, G. Edgar Folk Jr., Karen B. Coady, Mary A. Folk Jan 1968

Physiological Observations On Raccoons In Winter, G. Edgar Folk Jr., Karen B. Coady, Mary A. Folk

Proceedings of the Iowa Academy of Science

Body temperatures were recorded earlier from raccoons tethered outdoors in extreme cold. There was no suppression in body temperature. Later, two events suggested a new study, this time on heart rates: (1) the development of implantable radio-capsules for heart rate and EKG, and (2) the information that bears develop a bradycardia in the winter den, slowing sleeping heart rates from 40 b/m to 8-15 b/m. Three raccoons were studied periodically in outdoor dens in midwinter with Iowa implanted radio-capsules. Unlike the bears, when the raccoons stayed indoors for several days due to severe weather, their sleeping heart rates went up, …

Go to article

Officers, Iowa Academy Of Science Jan 1968

Officers, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Properties Of Lntervalence Antimony Bromides, M. L. Hackert, S. L. Lawton, R. A. Jacobson Jan 1968

Properties Of Lntervalence Antimony Bromides, M. L. Hackert, S. L. Lawton, R. A. Jacobson

Proceedings of the Iowa Academy of Science

Monovalent organic amines; R+, have been used to synthesize 15 intensely colored salts of composition RxSbyBrz. It is believed that the dark color may be due to the presence of mixed oxidation states of antimony or to some other type of charge transfer phenomena. Preliminary X-ray investigations and density measurements demonstrate that the ratio R:Sb:Br is cation dependent. Such ratios as 3:2:12, 4:2:12, and 2:1:9 have been observed and imply that the presumed Sb(III) and Sb(V) atoms do not necessarily occupy pseudo-equivalent positions in the unit cell. The temperature dependence of the …

Go to article

Title Page - Front Matter Jan 1968

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Plankton Of A Variable Level Flood Control Reservoir, Donald J. Schmidt Jan 1968

Plankton Of A Variable Level Flood Control Reservoir, Donald J. Schmidt

Proceedings of the Iowa Academy of Science

The increased number of flood-control dams constructed on rivers in recent years have created impoundments with physical and biological conditions that are at best poorly understood. A flood-control reservoir does not have normal lake conditions. The most apparent difference is the drastic changes in water level during flood control operations. The great majority of limnological studies have been conducted on natural lakes and the data apply only in a general way to the study of artificial reservoirs. Many of the investigations are concerned with only the summer months. As a consequence, our over-all concept of year-'round ecological conditions in reservoirs …

Go to article

Anthocyanin Pigments In The Genus Lobelia: I. Pigments In Lobelia Cardinalis L. And L. Siphilitica L., S. Lane Wilson Jan 1968

Anthocyanin Pigments In The Genus Lobelia: I. Pigments In Lobelia Cardinalis L. And L. Siphilitica L., S. Lane Wilson

Proceedings of the Iowa Academy of Science

The corollas of L. cardinalis and L. siphilitica were extracted in 1 percent HCl in methanol for 24 hours. This extract (10 ml. portions) was streaked on 3 mm. Whatman filterpaper. The filterpaper was placed in a large chromatographic tank in a solvent system of n-butanol: acetic acid: water (4:1:5 v/v). After separation the bands were cut out and the pigment from each band eluted in a solution of 0.01 percent HCI in methanol. These solutions were then reduced in volume under vacuum and the absorption spectrum of each pigment determined. Aliquots of the crude extract was also spotted on …

Go to article

Spotted Skunk And Weasel Populations Den And Cover Usage By Northeast Iowa, Emmett Polder Jan 1968

Spotted Skunk And Weasel Populations Den And Cover Usage By Northeast Iowa, Emmett Polder

Proceedings of the Iowa Academy of Science

Examination of dens and territories of 118 Mustela frenata, 59 Mustela rixosa, and 65 Spilogale interrupta, in northeast Iowa indicated that tall grass, hay meadow, and brush-bramble-weed growth at field edges were the favorite habitats of the three species. Black willows were attractive to Spilogale and M. Jrenata. M. rixosa was most tolerant of sparse cover. Spilogale and M. frenata preferred burrows of Franklin ground squirrels and pocket gophers for primary den sites. M. rixosa favored mole runs and Blarina burrows for den sites. The present trend to continuous corn, reduced hay acreage, removal of permanent fences, and use of …

Go to article

Age And Growth Of Bluegills, Lepomis Macrochirus Ra:Finesque, From Selected Central Iowa Farm Ponds, Jerome V. Shireman Jan 1968

Age And Growth Of Bluegills, Lepomis Macrochirus Ra:Finesque, From Selected Central Iowa Farm Ponds, Jerome V. Shireman

Proceedings of the Iowa Academy of Science

Population estimates were made on five farm ponds in central Iowa during 1965. Age and growth determinations were made from scales of 638 bluegills collected from these ponds. Bluegills standing crops averaged 248 pounds per acre, ranging from 201 to 321 pounds per acre. Growth rates of bluegills from the balanced ponds were average when compared with growth rates of bluegills from other Iowa lakes and ponds.

Go to article

Cover - Ias & Ists Officers, Directors And Chairpersons - Ist Journal Information - Table Of Contents Jan 1968

Cover - Ias & Ists Officers, Directors And Chairpersons - Ist Journal Information - Table Of Contents

Iowa Science Teachers Journal

No abstract provided.

Go to article

Iowa Section Of Aapt Jan 1968

Iowa Section Of Aapt

Iowa Science Teachers Journal

The Annual Spring Meeting of the Iowa Section of the American Association of Physics Teachers will be held on Saturday, April 20, 1968, at Wartburg College.

Go to article

Back Cover Jan 1968

Back Cover

Iowa Science Teachers Journal

No abstract provided.

Go to article

Implications Of An Elective Sophomore Ecology Course, Lynn W. Glass Jan 1968

Implications Of An Elective Sophomore Ecology Course, Lynn W. Glass

Iowa Science Teachers Journal

What does your high school do to provide for an interesting and enriching experience in science for the average student? Since the beginning of PSSC in 1956 all too many of us have been guilty of neglecting the high school general education science program.

Go to article

Receives Scs Award Jan 1968

Receives Scs Award

Iowa Science Teachers Journal

Margaret June Black, retired assistant professor of education at Drake University in Des Moines, has been named an honorary member of the Soil Conservation Society of America.

Go to article

Can A Young Man Whose Mind Is On Girls, Booze, Skiing, And High-Class Parties Win The Nobel Prize?, Peter Farb Jan 1968

Can A Young Man Whose Mind Is On Girls, Booze, Skiing, And High-Class Parties Win The Nobel Prize?, Peter Farb

Iowa Science Teachers Journal

The Double Helix is a brief story of the structure of the genetic material DNA. As such, it is exceedingly valuable to the historian of science. But another, somewhat irreverent aspect of the book, to be discussed later in this review, makes it an important document for the general reader as well and one that deserves wide reading.

Go to article

Flexible-Modular Scheduling With The Slow Learner, Eugene Balk Jan 1968

Flexible-Modular Scheduling With The Slow Learner, Eugene Balk

Iowa Science Teachers Journal

At Mason City High School this year something new has been added in the biology curriculum. It is part of the New Design, better known as Phase II Flex. Approximately 160 sophomores are in the program and are known as low achievers for various reasons. One of the reasons is that they are no longer interested in school. The lack of interest may be due to the traditional school day (fifty-five minutes, six periods a day) or to the fact that the students have never achieved success in anything they have attempted in school.

Go to article

Junior Academy News Jan 1968

Junior Academy News

Iowa Science Teachers Journal

We have a new IJAS constitution and a new central headquarters. All members of an appointed Iowa Junior Academy of Science Constitutional Revision Committee have been very active this summer. Dr. Robert Yager, professor of science education at The University of Iowa, was the busy chairman.

Go to article

Health Education For The Elementary Grades, Mardelle Mohn, Malcolm Price Laboratory School (University Of Northern Iowa) Jan 1968

Health Education For The Elementary Grades, Mardelle Mohn, Malcolm Price Laboratory School (University Of Northern Iowa)

History of Education Book Gallery

No abstract provided.

Go to article

Past Presidents, Iowa Academy Of Science Jan 1968

Past Presidents, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Variation Among Participants In The Count Of Calls Of Cock Pheasants, Paul A. Vohs Jr., Dale Hein Jan 1968

Variation Among Participants In The Count Of Calls Of Cock Pheasants, Paul A. Vohs Jr., Dale Hein

Proceedings of the Iowa Academy of Science

Analysis of variance of counts of calls of male ringnecked pheasants (Phasianus colchicus) in Iowa revealed highly significant differences among 16 persons on the same 10-station route on the same morning. Differences up to 15 minutes in starting time of observers had no significant effect on counts.

Go to article

Survival, Reproductive Success, And Spread Of Introduced Rio Grande Turkeys In Northeast Iowa, Dennis D. Wigal, Arnold O. Haugen Jan 1968

Survival, Reproductive Success, And Spread Of Introduced Rio Grande Turkeys In Northeast Iowa, Dennis D. Wigal, Arnold O. Haugen

Proceedings of the Iowa Academy of Science

Thirty-nine Rio Grande wild turkeys (Meleagris gallopavo intermedia) from Texas were introduced in the Yellow River State Forest, Allamakee County, Iowa, in the winter of 1960-61. The population was studied in three northeastern Iowa counties from June, 1966, through September, 1967; concentrated field studies were centered in and near the Paint Creek Unit of the forest. Adult turkeys appeared to tolerate the northeastern Iowa climate well, but poults may not be so tolerant. Although reproduction has occurred each year since the introduction, poult survival seemingly has been sporadic, possibly because of differences in weather conditions during the rearing seasons. …

Go to article

A Consideration Of Pollen, Diatoms And Other Remains In Postglacial Sediments, John D. Dodd, Ruth M. Webster, Gary Collins, Larry Wehr Jan 1968

A Consideration Of Pollen, Diatoms And Other Remains In Postglacial Sediments, John D. Dodd, Ruth M. Webster, Gary Collins, Larry Wehr

Proceedings of the Iowa Academy of Science

The significance of pollen and diatoms in post-glacial sediments from a shallow bay of Lake Okoboji, Iowa, is considered. The presence of other microfossils is noted with emphasis on those of Cretaceous origin: foraminifera, coccoliths, radiolarians, and hystrichosphaerids. Problems encountered and discussed include recognition of Chrysophyte statospores, redeposition, interpretation of data from lower levels, and reliability of radiocarbon dates applied to organic matter from aquatic vegetation.

Go to article

The Pleistocene Of Iowa: An Engineering Appraisal, R. L. Handy Jan 1968

The Pleistocene Of Iowa: An Engineering Appraisal, R. L. Handy

Proceedings of the Iowa Academy of Science

Pleistocene deposits from wind, water and ice dominate the soil engineering in Iowa. For foundation engineering the in situ properties of soils must be evaluated, the most pertinent properties being shear strength and compressibility. Alternately if the soil is to be used as a construction material, for example in embankment or earth dam construction, disturbed properties such as grain size and plasticity are utilized and are reflected in engineering classification. The shear strength, compressibility, and engineering classification of the various types of Pleistocene and Recent deposits in Iowa are presented and discussed, and examples of the use of shear strength …

Go to article

First Prev Next Last