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

Articles 3631 - 3660 of 4995

Full-Text Articles in Entire DC Network

A Study Of The Effects Of Hypothermia On The Electrical Activity Of The Hypothalamus In Citellus Tridecemlineatus, James H. Johnson Jan 1964

A Study Of The Effects Of Hypothermia On The Electrical Activity Of The Hypothalamus In Citellus Tridecemlineatus, James H. Johnson

Proceedings of the Iowa Academy of Science

Deep, chronic electrodes were implanted in the anterior and posterior hypothalamus of seven thirteen-lined ground squirrels. The electrical brain activity and heart rate were recorded as the animal's body temperature was decreased by cooling the animal in a refrigerator. Above 23°C body temperature, amplitude varied, but remained near normal. From 23° to 21°C the amplitude dropped sharply, decreasing by almost 50 per cent. Below 21 °C, the amplitude decreased more gradually. Detectable but not easily measurable activity was recorded at 11 °C. Frequency showed an initial rise, then decreased between 22° and 26°C, then increased again through 16°C. Heart rate …

Go to article

A Study Of The Small Rodents Of Black Hawk County, Iowa (1961-1962), Raymond L. Sloan Jan 1964

A Study Of The Small Rodents Of Black Hawk County, Iowa (1961-1962), Raymond L. Sloan

Proceedings of the Iowa Academy of Science

Two-hundred and fifty-nine small rodents were collected in Black Hawk County, Iowa, from June 1961 to June 1962. Specimens were taken from 53 locations in the county. Specimens of the following species were collected: Spermophilus tridecemlineatus tridecemlineatus, Reithrodontomys megalotis dychei, Peromyscus maniculatus bairdii, Peromyscus leucopus noveboracensis, Microtus pennsylvanicus pennsylvanicus, Microtus ochrogaster ochrogaster, and Mus musculus. Perognathus flavescens perniger and Tamias striatus griseus were reported to have been obtained by other investigators, but neither was taken during this study period.

Go to article

In Memoriam: Jesse W. Cavett; William A. Craft; Donald T. Davidson; William W. Farley Iii, Earl A. Hewitt; Harry Edwin Jaques; John N. Martin; William E. Medcalf; Robert E. Rundle Jan 1964

In Memoriam: Jesse W. Cavett; William A. Craft; Donald T. Davidson; William W. Farley Iii, Earl A. Hewitt; Harry Edwin Jaques; John N. Martin; William E. Medcalf; Robert E. Rundle

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Growth Responses Of A Myxomycete To Treatment With Plant Growth Regulating Substances, Mary Annunciata Mcmanus, Joselet Mary Ousephparampil Jan 1964

Growth Responses Of A Myxomycete To Treatment With Plant Growth Regulating Substances, Mary Annunciata Mcmanus, Joselet Mary Ousephparampil

Proceedings of the Iowa Academy of Science

Protoplasmodia of Clastoderma debaryanum multiply in culture to produce more individual plasmodia, each of which fruits into a single sporangium. After treatment of cultures with 1 ppm kinetin and with 1 ppm, 5 ppm, and 10 ppm aqueous solutions of 3-indoleacetic acid, the number of sporangia produced was consistently greater than in controls. Fewer sporangia, as compared to controls, were produced after treatment with kinetin at 5 ppm and 10 ppm, and no consistent results were obtained after treatment with gibberellic acid at the same concentrations.

Go to article

The Orangethroat Darter (Etheostoma Spectabile) In Eastern Iowa, Karl E. Goellner Jan 1964

The Orangethroat Darter (Etheostoma Spectabile) In Eastern Iowa, Karl E. Goellner

Proceedings of the Iowa Academy of Science

The orangethroat darter, thought possibly to be extinct in Iowa, has been collected from a limited area north of Marion in Linn County, and from Des Moines County, near Burlington. An unpublished record from Davenport has not been confirmed. Another record from Taylor's Slough at Ft. Madison, in Lee County, is considered doubtful.

Go to article

Gross Structure Of The Cervical Region Of The Uterus Of White-Tailed Deer, John E. Morris Jan 1964

Gross Structure Of The Cervical Region Of The Uterus Of White-Tailed Deer, John E. Morris

Proceedings of the Iowa Academy of Science

The uterine cervix of the white-tailed deer, Odocoileus virginianus, consists of the narrowed-down multiple-valved part between the vagina and the hollow thinner-walled uterus proper. The length of the cervix of a mature doe in December may vary from 40 mm to 84 mm. It is composed of four to six, but generally of five, heavily muscled valves with the openings through the valves alternating dorsally and ventrally. This arrangement of valves results in an undulating or twisted passageway through the cervix. Age and reproductive history influences variation in size. The inside surface of the cervix is covered with small longitudinal …

Go to article

Age, Growth, Fecundity And Food Habits Of Fantail Darters In Boone County, Lowa, James R. Karr Jan 1964

Age, Growth, Fecundity And Food Habits Of Fantail Darters In Boone County, Lowa, James R. Karr

Proceedings of the Iowa Academy of Science

Although 117 fantail darters (Etheostoma flabellare) were collected from Bluff Creek, Boone County, Iowa, during summer 1962 and winter 1962-63, only 1 was found in the Des Moines River. Slenderhead darters occupy the similar riffle areas in the river. Female fantail darters were 18.7, 34.8, and 42.4 mm at the first through the third annuli, respectively, and male darters were 18.5, 36.7, 59.0, and 62.0 mm at the first through the fourth annuli, respectively. No females were found that had formed a fourth annulus. Average coefficient of condition for 104 fantail darters was 1.749. Length-weight relationships for males and …

Go to article

Adaptation As Related To The Introversion-Extroversion Dimension, Earl D. Scott, David Wilkinson Jan 1964

Adaptation As Related To The Introversion-Extroversion Dimension, Earl D. Scott, David Wilkinson

Proceedings of the Iowa Academy of Science

Thirteen young adult men were given a test for introversion-extroversion. They were then tested to determine the number of presentations of a noxious stimulus which was required for adaption to the stimulus to take place, as measured by the galvanic skin response. It was found that extroverts adapted with significantly fewer stimulus presentations than did introverts. The results were related to Eysenck's theory concerning the introversion-extroversion dimension and conditionability.

Go to article

Factors Promoting Scientific Interest Or Inquiry From Birth To Age 17, Phillip E. Miller Jan 1964

Factors Promoting Scientific Interest Or Inquiry From Birth To Age 17, Phillip E. Miller

Proceedings of the Iowa Academy of Science

According to outstanding high school students and their parents, outstanding science students most frequently become initially interested in science during the 6 to 9th grades. Parents of these students indicated that teachers are most influential in maintaining interest in science once science interest has begun.

Go to article

An Ecological Analysis Of Silver Lake Fen I. The Aquatic Metazoan Fauna, Lawrence Eickstaedt Jan 1964

An Ecological Analysis Of Silver Lake Fen I. The Aquatic Metazoan Fauna, Lawrence Eickstaedt

Proceedings of the Iowa Academy of Science

The aquatic metazoan fauna and physicochemical features of the Silver Lake Fen, Dickinson County, Iowa, were investigated. The pools displayed high values of alkalinity, calcium and total hardness, sulfate and dissolved solids; neutral to alkaline conditions; and extreme diurnal variability in dissolved gasses, pH and temperature. Fifty metazoan species have been collected from this unique and rigorous habitat, with nine species being most abundant and widespread. Possible causal factors dealing with population dispersion are discussed.

Go to article

Summer Emigrations Of The Frog Rana Pipiens In Northwestern Iowa, Richard V. Bovbjerg, Ann M. Bovbjerg Jan 1964

Summer Emigrations Of The Frog Rana Pipiens In Northwestern Iowa, Richard V. Bovbjerg, Ann M. Bovbjerg

Proceedings of the Iowa Academy of Science

During the summers of 1961, 1962, and 1963, mass emigrations of Rana pipiens pipiens Schreber occurred at the end of the first week in July. The intensity of the movement varied in the three years. Environmental causes for this movement were considered; temperature changes, precipitation or crowding do not seem to be operating. Samples of the tadpole populations were examined and the metamorphic changes prior to emigration are rapid and regular. With final metamorphosis into juvenile frogs, the emigration suddenly begins. It appears to be triggered by internal events related to maturation.

Go to article

Ecological Observations On Iowa Shore Flies (Diptera, Ephydridae), D. L. Deonier Jan 1964

Ecological Observations On Iowa Shore Flies (Diptera, Ephydridae), D. L. Deonier

Proceedings of the Iowa Academy of Science

An intensive survey of the ephydrid fauna of Iowa was conducted in 1959-1961. The ecological and preliminary distribution and phenological data are presented in tabular form

Go to article

Gizzard Lesions Associated With Haemoproteus Sacharovi Infections Of Pigeons, John N. Farmer Jan 1964

Gizzard Lesions Associated With Haemoproteus Sacharovi Infections Of Pigeons, John N. Farmer

Proceedings of the Iowa Academy of Science

Becker et al. (1956) described abnormally enlarged spleens and granular gizzards observed in several killed pigeons. Blood films made from these particular birds were diagnosed as positive for Haemoproteus sacharovi. Since mourning doves represent a host for this parasite, four infected doves were killed and selected tissues sectioned and examined in an attempt to locate sites of exoerythrocytic schizogony. None were observed although the spleens of these birds were markedly swollen and colored a mottled purplish-black. Concerning pigeons, however, granular gizzards were observed in each of eight H. sacharovi infected pigeons killed. Examination of sections of infected gizzard revealed areas …

Go to article

Characteristics Of Instrumentation Personnel In The Aerospace Manufacturing Industry Of The New York Metropolitan Area, Kennith Glenn Gordon Jan 1964

Characteristics Of Instrumentation Personnel In The Aerospace Manufacturing Industry Of The New York Metropolitan Area, Kennith Glenn Gordon

Dissertations and Theses @ UNI

As the aerospace manufacturing industry of the New York Metropolitan Area becomes more deeply involved in industrial, scientific, and military activities, it seems reasonable to expect a corresponding growth in the knowledge and understanding of that industry by the engineering and education professions alike . The engineering profession would require an accurate description of the technical character, while the education profession would be concerned with developing a better understanding of the educational ramifications of this new industry. A study of the entire industry would have required the use of resources beyond the power of the writer. However, it was decided …

Go to article

Using Sordaria Fimicola For Teaching Genetic Segregation, Crossing Over, And Probability, Roger Green Isaacson Jan 1964

Using Sordaria Fimicola For Teaching Genetic Segregation, Crossing Over, And Probability, Roger Green Isaacson

Dissertations and Theses @ UNI

Since the late 1950's, American education has been undergoing a critical evaluation and review. This review has brought about some changes in emphasis and an upgrading in science curricula. The American Institute of Biological Sciences, supported by the National Science Foundation, accepted major responsibility for the field of biology and established the Biological Science Curriculum Study (BSCS). H. Bentley Glass., Chairman of BSCS, states: "The aim of the Biological Science Curriculum Study is to place biological knowledge in its fullest modem perspective. To accomplish this aim, a program of research, writing, testing, and evaluation was inaugurated.

Go to article

Thou Shalt Keep Christmas: An Operetta For Upper Elementary Grades Or Junior High School Performance, Marion Gertrude Arends Jan 1964

Thou Shalt Keep Christmas: An Operetta For Upper Elementary Grades Or Junior High School Performance, Marion Gertrude Arends

Dissertations and Theses @ UNI

Numerous operettas with Christmas themes, some sacred, some secular, some employing familiar carols, and some entirely original in both text and lyrics have been written for the elementary grades and junior high. There are many pageants depicting Christmas customs and using carols from many countries of the world. However, an investigation of available material has not revealed an operetta based strictly on carols and customs of just one country. The carols and customs of Old England three and four centuries ago are particularly interesting because of the fact that our founding fathers came from the shores of that country, and …

Go to article

Four Compositions For Percussion And Other Instruments, James Arnold Coffin Jan 1964

Four Compositions For Percussion And Other Instruments, James Arnold Coffin

Dissertations and Theses @ UNI

Contemporary composers in quest of new media of expression are creating new musical dimensions through the extended use of percussion, thereby elevating percussion instruments from a secondary musical position to a height achieved before only in primitive civilizations.

Go to article

State College Of Iowa Schedule Of Classes, Summer 1963, State College Of Iowa Jul 1963

State College Of Iowa Schedule Of Classes, Summer 1963, State College Of Iowa

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the State College of Iowa.

Go to article

The Production Of Agglutinins In Response To Antigens Of Ascaris Lumricoides Var. Suum, James Lee Prouty Jan 1963

The Production Of Agglutinins In Response To Antigens Of Ascaris Lumricoides Var. Suum, James Lee Prouty

Proceedings of the Iowa Academy of Science

Studies of immunological reactions with Ascaris lumbricoides var. suum have been carried out by a number of investigators involving in vitro and in vivo tests. As far as can be determined agglutinin antibodies have not been demonstrated. It seems likely that agglutinins may be produced in experimental animals if appropriate techniques for their demonstration are devised. Two rabbits were bled initially from the external marginal ear vein. These sera were used as controls. The rabbits were immunized with body fluid and egg antigens of Ascaris lumbricoides var. suum at various intervals for a three and one-half week period. At the …

Go to article

Measurement Of Standard Metabolism, Water Loss And Body Temperature Of The Little Brown Bat, Robert E. Henshaw, G. Edgar Folk Jr. Jan 1963

Measurement Of Standard Metabolism, Water Loss And Body Temperature Of The Little Brown Bat, Robert E. Henshaw, G. Edgar Folk Jr.

Proceedings of the Iowa Academy of Science

A complete description is given of a respirometer, suitable for unrestrained five to ten gram bats, from which the following variables were simultaneously directly measured: air and body temperatures, relative humidity, oxygen consumption, carbon dioxide production, water loss, and electrocardiograms. Temperature was measured with specially mounted bead thermistors and a wheatstone bridge. Relative humidity was measured with an adsorptive electronic sensor which was excited by a transistorized oscillator, and had the voltage output rectified and fed to an oscillograph. Electrocardiograms were taken with custom-made "safety" pins chronically indwelling through the dorsolateral thoracic epidermis. Electrical connection was made with common clothing …

Go to article

Teaching And Applying The Gene-For-Gene Hypothesis For Interactions In Host:Parasite Systems, J. A. Browning Jan 1963

Teaching And Applying The Gene-For-Gene Hypothesis For Interactions In Host:Parasite Systems, J. A. Browning

Proceedings of the Iowa Academy of Science

A "lock-for-key" method of teaching the gene-for- gene hypothesis for interactions in host:parasite systems, and an example of the application of the hypothesis to an "unknown" disease, stem rust of oats, are presented.

Go to article

Naturally Occurring Agglutinins For Pheasant Red Blood Cells, Paul Vohs Jr., Elizabeth A. Cerny, A. O. Haugen Jan 1963

Naturally Occurring Agglutinins For Pheasant Red Blood Cells, Paul Vohs Jr., Elizabeth A. Cerny, A. O. Haugen

Proceedings of the Iowa Academy of Science

Sera from 24 vertebrate species and 3 antisera specific for human type A, B and Rh-D cells, respectively, were tested for their ability to agglutinate red blood cells of ring-necked pheasants (Phasianus sp.). Normal sera were grouped on the basis of agglutination titer, and the majority were included in the moderate and strong groups. Differential agglutination was limited, however. Substantial variation in ability to agglutinate pheasant cells occurred among sera of individuals of the same species. The usefulness of natural sera tested appears limited in the investigation of blood group factors of ring-necked pheasants.

Go to article

Additions To The Moss Flora Of Iowa, Gary L. Smith Jan 1963

Additions To The Moss Flora Of Iowa, Gary L. Smith

Proceedings of the Iowa Academy of Science

Buxbaumia aphylla Hedw. and Climacium kindbergii (R. & C.) Grout are reported for the first time from Iowa.

Go to article

Food And Growth Of Spottail Shiners And Other Forage Fishes Of Clear Lake, Lowa, Bernard L. Griswold Jan 1963

Food And Growth Of Spottail Shiners And Other Forage Fishes Of Clear Lake, Lowa, Bernard L. Griswold

Proceedings of the Iowa Academy of Science

Collections of spottail shiners, Notropsis hudsonius, and other forage fishes were made by systematic seining in Clear Lake in 1961. Spottails made up 71.6 per cent of all forage species and were collected most frequently in areas of vegetation. Although most spawning occurred in late May and early June, a few spottails apparently spawned in August. Young spottails grew an average of 0.05 millimeters per day which is slower than in warmer years. No parasites of spottails were observed. Tadpole madtoms, Noturus gyrinus, made up 18.4 per cent of all forage species collected, higher than any previous year. All species …

Go to article

The Effects Of Phlorizin, 2,4-Dinitrophenol, And Oxygen Deprivation On The Intestinal Transport Of D-Glucose, Alice Marie Fox Jan 1963

The Effects Of Phlorizin, 2,4-Dinitrophenol, And Oxygen Deprivation On The Intestinal Transport Of D-Glucose, Alice Marie Fox

Proceedings of the Iowa Academy of Science

The effect of various concentrations of phlorizin and 2,4-dinitrophenol, plus the effect of oxygen deprivation on intestinal absorption of D-glucose was investigated. Paired segments of turtle (Chrysemys picta) small intestine in vitro were used. Preparations were incubated for one hour in a shaking water bath at 30°C in Krebs-Ringer-bicarbonate, with or without inhibitor. Phlorizin, in all concentrations used, was found to prevent uptake of glucose by the mucosal epithelium. Inhibition also occurred, in a lesser degree, with 2,4-dinitrophenol, and when the system was flushed with nitrogen instead of air.

Go to article

Gustatory Responses Of A Tropical Frugivorous Bat, Irving F. Fisherman Jan 1963

Gustatory Responses Of A Tropical Frugivorous Bat, Irving F. Fisherman

Proceedings of the Iowa Academy of Science

The electrical activity of the chorda tympani nerve in response to chemical stimulation of the tongue of the tropical frugivorous bat Artibeus jamaicensis was compared to that of several rodents and carnivores. The slope of the NaCl response-concentration curve is much steeper than curves for the other animals and the maximum response is reached at a lower concentration (approximately 0.25M NaCl). NaCl is a more adequate stimulus than NH4Cl, LiCl is approximately equal to NaCl, and KCl response is low. These results are similar to those previously found for the rodents but quite different from those for the …

Go to article

Reports - The Board Of Directors; Financial Statement; Staff Reports; Committee Reports; Presidential Address: The Iowa Academy, Past And Future Jan 1963

Reports - The Board Of Directors; Financial Statement; Staff Reports; Committee Reports; Presidential Address: The Iowa Academy, Past And Future

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

Survival Of Empoasca Labae (Harris) (Cicadellidae, Homoptera) On Synthetic Media, Douglas L. Dahlman Jan 1963

Survival Of Empoasca Labae (Harris) (Cicadellidae, Homoptera) On Synthetic Media, Douglas L. Dahlman

Proceedings of the Iowa Academy of Science

Nymphs of the potato leafhopper were caged in small clear plastic snap boxes for individual survival studies. All experiments were conducted at 85°F in a darkened incubator, minimizing responses to light and varying temperature. The leafhopper nymphs were sustained on an agar gel matrix containing sugars and amino acids. Relative nutritional adequacy was evaluated by the time required to reach 50% survival. The lowest mortality rate occurred on a 7% sucrose-2% agar medium. Preferential utilization of the glucose fraction of sucrose was indicated. A medium composed of agar, sucrose, and the 10 amino acids essential for human and rat nutrition …

Go to article

The Effect Of Temperature Change On The Reaction Time Of Helisoma Trivolvis (Say), Paul K. Gauer Jan 1963

The Effect Of Temperature Change On The Reaction Time Of Helisoma Trivolvis (Say), Paul K. Gauer

Proceedings of the Iowa Academy of Science

A study of reaction speed, at different temperatures, of fresh-water snails (Helisoma trivolvis) is reported. Organic response to mechanical stimuli shows a definite relationship of reaction speed to the environmental temperature. There is an increase in rate of reaction from 40°F to 98°F; and a subsequent leveling off trend from 98°F to 110°F. Snail size has no appreciable effect upon reaction speed. Learning by experience is suggested.

Go to article

A Rapid Celloidin Method For The Rotary Microtome, G. L. Walls Jan 1963

A Rapid Celloidin Method For The Rotary Microtome, G. L. Walls

Proceedings of the Iowa Academy of Science

A method is described which combines the author's hot celloidin technique (see STAIN TECHNOL., VII. pp. 135-145) with a form of the clearing-before-cutting procedure. The method requires only 16-17 days and yields a block which may he cut in any microtome, the sections being as thin as those afforded by paraffin with comparable material. The advantages of celloidin over paraffin, listed in the author's earlier paper (v. s.), are retained in the present method which, though consuming more time than the hot process, requires less skill and gives superior results.

Go to article

First Prev Next Last