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Front Matter

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Ecoregions And Subregions Of Iowa: A Framework For Water Quality Assessment And Management, Glenn E. Griffith, James M. Omernik, Thomas F. Wilton, Suzanne M. Pierson

Journal of the Iowa Academy of Science: JIAS

Ecoregion frameworks are valuable tools for inventorying and assessing environmental resources, for setting resource management goals, and for developing biological criteria and water quality standards. In a collaborative project between the Iowa Department of Natural Resources (DNR) and the U.S. Environmental Protection Agency (EPA), we have refined boundaries of the EPA's five ecological regions of Iowa and defined six subregions of the Western Corn Belt Plains ecoregion within the state. Lists of candidate stream reference sites have been developed to date for the seven largest regions, and the sites were visited and evaluated by Iowa DNR and U.S. EPA personnel …

Back Cover

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Removal Of Magnetic Impurities From Strontium Copper Oxychloride, Colleen B. Eads, Carol J. Kosmicke, Lance L. Miller

Journal of the Iowa Academy of Science: JIAS

Analyses of a copper-deficient series of Strontium Copper Oxychloride polycrystalline samples are reported. Magnetic susceptibility, X-ray powder diffraction, and differential thermal analyses show a small Curie-type magnetic signal correlates with =0.6% (excess) copper ions in the nominally stoichiometric material. The analyses also imply that the extra magnetic signal is from an impurity phase, possibly related to Strontium Copper Oxide. The concentration of the impurity phase can be controlled by varying the copper stoichiometry.

Nuclear Waste Into Glass: Viscosities Of Molten Analogs Of Radioactive Waste Disposal Media, Betty Pang, Kenneth E. Windom

Journal of the Iowa Academy of Science: JIAS

Disposal of high-level radioactive wastes involves vitrification of a mixture of waste products and borosilicate glass frit. Monitoring the composition of the mixture is critical to the control of the vitrification process, bur is difficult because of the high levels or radioactive components in the mixture. Synthetic non-radioactive analogs of the products from nuclear reprocessing have been prepared and their viscosities measured over a wide range of temperature appropriate to those of the vitrification process. Preliminary results indicate that viscosity is a linear function of composition, under isothermal conditions, for a limited compositional range that encompasses the proportions of waste …

Influence Of Reduced Leaching On Growth Of Seedlings Of Black Locust Inoculated With Rhizobia, William R. Graves, Sandra R. Anfinson

Journal of the Iowa Academy of Science: JIAS

Seedlings of black locust (Robinia pseudoacacia L.) were inoculated with compatible rhizobia and irrigated twice each week with solution containing either 50 or 150 mg nitrogen/L. Leaching fraction treatments of 0, 0.2, or 0.4 were maintained for 6 weeks. Seedlings supplied 50 mg nitrogen/L grew poorly compared co planes supplied 150 mg nitrogen/L regardless of leaching fraction. Dry masses of shoots and of entire planes were lower for seedlings in the 0 and 0.2 leaching fraction treatments compared with chose in the 0.4 treatment. Neither leaching fraction nor applied nitrogen concentration appeared co affect the number of nodules per plant, …

Parallel Algorithms For Solving Partial Differential Equations, Stacy Pschenica

Journal of the Iowa Academy of Science: JIAS

This paper describes the use of a parallel computer system in applying a finite difference method to solve various types of partial differential equations. A sequential implementation of this method was made parallel by essentially spatially decomposing the problem domain into pieces that could be separately analyzed and assigning each piece to a processor in a large, multi-processor system. Although this approach is attractive in theory, it suffers in practice because of inter-processor interactions. Thus, particular emphasis was placed on developing efficient methods for the sharing of information among the processors.

Initially, a simple two-dimensional board game, life, was implemented …

Editorial Board & Iowa Academy Of Science Officers And Directors

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Annual Report Of The Iowa Academy Of Science, 1993-94, Paul E. Rider

Journal of the Iowa Academy of Science: JIAS

Since 1976, annual reports have served as a continuing record of the activities of the Iowa Academy of Science and an archive for its history. These augment the 100 year IAS history written in the centennial year of 1975.

This report covers the period from July 1, 1993 to June 30, 1994. It is based on the official records of the Academy (committee reports, Board minutes, correspondence) as well as the recollections, impressions and thoughts of the author.

Editorial Board & Iowa Academy Of Science Officers And Directors

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

The Iowa Academy Of Science Parish Farm: 1986-1992, David L. Dozark

Journal of the Iowa Academy of Science: JIAS

This article focuses on the Iowa Academy of Science Parish Farm and the progress made in the last seven years towards the goals set forth in the Model Farm Concept which was adopted by the Academy in 1970. Highlights of this article are a summary of the income and expenses associated with the farm's highly profitable crop production, the ground-water monitoring project being conducted by the Geological Survey Bureau, the woodlot rejuvenation project, soil and wildlife conservation improvements, and the prairie forbes exhibit area. The farm continues to serve as a primary source of income for the Academy and a …

Analysis Of An Iowa Aridity Index In Relationship To Climate And Crop Yield, Soumare Harouna, R. E. Carlson

Journal of the Iowa Academy of Science: JIAS

An aridity index and its components, temperature and precipitation, for the period from 1900 through April 1993 were defined and characterized. This index describes the anomalous behavior of both temperature and precipitation over time. Our intent was to examine climate variability in Iowa. Moving mean and standard deviations over various lengths of time were calculated from three time series. We found that these indices fluctuate considerably from year to year and from month to month. The lowest aridity index values occurred in the recent summer of 1992, and the highest occurred during the very drought-prone 1930s. The 12-month moving mean …

Relation Between S2 And Later Generation Testcrosses Of Two Corn Populations, S. M. Lile, A. R. Hallauer

Journal of the Iowa Academy of Science: JIAS

Determination of the relative combining abilities of corn (Zea mays L.) inbred lines is an important feature of applied corn breeding programs. Combining ability is measured by the relative performance of a line in testcrosses to one or more testers. Inbred lines from BS13(S2)Cl and BSCB1(R)C7 corn populations were evaluated at the S₂ and later generations of inbreeding. Intense selection was practiced among and within lines during inbreeding to develop the S₅-equivalent and S₈ generation lines. The objective of this study was to determine if the combining ability of lines in early generations (S₂) …

Post-Natal Survival Of Raccoons In Relation To Female Age And Denning Behavior, Jonathan J. Judson, William R. Clark, Ronald D. Andrews

Journal of the Iowa Academy of Science: JIAS

We measured post-natal survival of radio-collared raccoons 1-5 months old in southwest Iowa, 1988-1989. We compared survival of young nurtured by yearling and adult females and related den site selection to survival functions using proportional hazards models. Adult females used upland and farmstead habitats note frequently than yearlings, whereas yearling females used lowland habitats note frequently. Tree cavities and beds on the ground were used most frequently. Adult females denned in buildings 13% of the time and in holes in the ground 9.5% of the time, whereas yearlings frequently tested with litters in beds on the ground (31%). Microhab1tat characteristics …

Journal Of The Iowa Academy Of Science Submission Form And Instruction Sheet

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Crystal Structure Of An Iodine Phenazine Complex: C12h9n2 + · I3-. C12h8n2 · 1/6i2, Rebecca A. Brandenburg, Sharon L. Ringrose, Robert A. Jacobson

Journal of the Iowa Academy of Science: JIAS

A structural study of the polyiodide containing species C₁₂H₉N₂⁺ I₃^- C₁₂H₈N₂ · 1/6I₂ was carried out by single crystal X-ray diffraction techniques. The material crystallizes in the monoclinic space group C2/m with a= 16.561(5), b = 8.372(2), c = 9.908(5) A and β = 111.24°. There are two molecules per cell. Dara were collected using Mo K_ἀ radiation and refinement converged to R = 0.027 based on the 1996 unique reflections with |F_o|≥3δ(F_o). The iodine atoms were found coexist in two …

Testing The Accuracy And Precision Of Wetness Sensors In A Tomato Field And On Turfgrass, Kara J. Potratz, Mark L. Gleason, Melanie L. Hockmuth, Sharon K. Parker, Glenn A. Pearston

Journal of the Iowa Academy of Science: JIAS

Measurements of dew-period duration by painted, flat-plate, electronic wetness sensors at the top of the plant canopy in a tomato field and on adjacent turfgrass were compared with visual observations. The response range of sensors during the onset of dew sometimes exceeded 5 hr. but was less than 1 hr. on other nights. Sensors in the tomato field indicated dew formation occurred as much as 2 hr. earlier or later than dew became visible on adjacent tomato leaflets at the top of the crop canopy. A calibration threshold for sensors derived from a drying curve resulted in the underestimation of …

Back Cover

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Cover - Table Of Contents

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Note To Members And Subscribers, Paul E. Rider

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Water Quality Monitoring (1988 To 1991) At The Iowa Academy Of Science's Parish Farm, Grundy County, Iowa, Brenda K. Nations, George R. Hallberg

Journal of the Iowa Academy of Science: JIAS

In May 1988 sampling was initiated to evaluate water quality in relation to management practices at Parish Farm, which is owned by Iowa Academy of Science. Initial results showed tile-line effluent to have high concentrations of nitrate-nitrogen (N0₃-N). Twelve monitoring wells were installed over a one year period to analyze shallow groundwater at the farm. The wells, tile lines, and surface water were sampled monthly, through October, 1991, and the water analyzed for N0₃-N and some pesticides. N0₃-N concentrations varied, related to landuse and management of adjacent areas. Greater N0₃-N concentrations were …

Evaluation Of Implanted Radio Transmitters In Pheasant Chicks, Dean E. Ewing, William R. Clark, Paul A. Vohls

Journal of the Iowa Academy of Science: JIAS

We studied game-farm pheasant (Phasianus colchicus Linneaus) chicks implanted with miniature transmitters to determine if surgery and implantation affected growth, behavior, or survival. Transmitters (weighing 1.2 g) were implanted subcutaneously in the interscapular region in day-old chicks. In Experiment 1, biological effects on chicks with transmitters implanted were compared with data from a control group. In Experiment 2, the effects of anesthesia only, anesthesia with an implanted transmitter, and implanted transmitter only were compared with a control. We measured responses of weight gain, survival, and pecking behavior in each experiment. In Experiment 1, we found no significant differences in weight …

Soybean Residual Effects On A Subsequent Maize Crop, E. S. Escuro, D. N. Sundberg, R. M. Shibles

Journal of the Iowa Academy of Science: JIAS

Maize (Zea mays 1.) grown after soybean (Glycine max 1. Merr.) consistently performs better than maize that follows itself (second year maize), irrespective of nitrogen fertilization. In previous studies of the soybean-maize rotation, there never has been an evaluation of the potentially different effects of soybean genotypes on following maize. A two-year, soybean maize rotation was initiated in Ames at 1988 with the first year planted to various soybean genotypes, a maize hybrid, and oat (Avena sativa 1.). These were followed in the second year by a single maize hybrid with 0, 80, 160, and 240 kg/ha N fertilization levels. …

Conceptual Representation Of The Newtonian Model Of Motion In University Physics Students, Yannis Hadzigeorgiou

Dissertations and Theses @ UNI

The purpose of this study was to investigate how undergraduate students at the University of Northern Iowa who had taken prior coursework on non-calculus general physics with a unit on mechanics understand the Newtonian model of motion. In general, the study was concerned with reasoning strategies, the preconceptions that give rise to these strategies, and the schema that might be inferred from the preconceptions. In particular, the study focused on the three fundamental notions of the Newtonian model of motion: {a) that uniform straight line motion is equivalent to rest, {b) that motion is relative to an inertial frame of …

A Qualitative Study Of The Perceptions Of The Physics Teaching Experiences Of Selected Iowa Teachers Who Have An Undergraduate Major In Biology, Jody Williams Bintz

Dissertations and Theses @ UNI

The purpose of this study was to explore the perceptions of the physics teaching experiences of selected Iowa physics teachers who have an undergraduate major in biology. Using a qualitative approach, 18 teachers who met the criteria of the study were interviewed in person or by telephone. The transcribed interviews served as the data which was analyzed inductively throughout the study. As the interview process continued, patterns emerged in the experiences of these teachers and in how these experiences affected their perceptions of teaching physics. While perceptions of the first physics teaching experience varied, all those interviewed reported feeling more …

Conceptual Representation Of The Newtonian Model Of Motion In University Physics Students, GiannēS ChatzēGeōRgiou

Dissertations and Theses @ UNI

The purpose of this study was to investigate how undergraduate students at the University of Northern Iowa who had taken prior coursework on non-calculus general physics with a unit on mechanics understand the Newtonian model of motion. In general, the study was concerned with reasoning strategies, the preconceptions that give rise to these strategies, and the schema that might be inferred from the preconceptions. In particular, the study focused on the three fundamental notions of the Newtonian model of motion: (a) that uniform straight line motion is equivalent to rest, (b) that motion is relative to an inertial frame of …

The Iowa Academy Of Science President's Banquet, 105th Session, Iowa Academy Of Science

Iowa Academy of Science Documents

Program:

Introductions
Awards:
Distinguished Fellow: George Burnet
Distinguished Iowa Science Teaching: Jay P. Kopp
Awarding of the Runkel-Roosa Natural History Research Grant
President's Address - outgoing President William Deskin
Response - President Jean Prior
General Sessions II - Robert Monserrate, "Crime Scene Search and Forensic Analysis"

105th Session Iowa Academy Of Science Awards Luncheon, April 23, 1993, Iowa Academy Of Science

Iowa Academy of Science Documents

Program:

--- Introduction of Head Table - William Deskin, President, Iowa Academy of Science
--- Recognition of students participating in various statewide activities - Larry Schwinger, Chair, Student Programs Committee
--- Presentation of scholarship winners and 1994 AJAS representatives - Peggy Tilgner, Wartburg College, Waverly
--- Presentation of Excellence in Science Teaching Awards - Roy Unruh, Director, ESTA Program

The Annual Meeting Of The Iowa Academy Of Science April 23-24, 1993 [Program, 105th Meeting], Iowa Academy Of Science

Iowa Academy of Science Documents

Contents:

Program Summary --- 5
General Session Speakers --- 9
Awards --- 12
Distinguished Iowa Science Teaching --- 12
Symposia Programs --- 13
STN Workshop --- 14
Poster Session --- 15
Campus Map --- Centerfold
Section Programs --- 18
Agricultural Sciences --- 18
Anthropology --- 18
Botany --- 19
Cellular & Molecular Biology --- 21
Chemical Education --- 24
Chemistry, Inorganic --- 24
Chemistry, Organic --- 26
Conservation --- 27
Earth Science Teaching --- 29
Elementary Science Teaching --- 29
Engineering --- 29
Geology --- 31
Linguistics --- 32
Nursing --- 32
Physics --- 33
Physiology --- 34
Psychology --- …

Cover - Front Matter - Table Of Contents

Iowa Science Teachers Journal

No abstract provided.