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Articles 31 - 54 of 54
Full-Text Articles in Science and Mathematics Education
Introduction, Neil P. Bernstein
Introduction, Neil P. Bernstein
Journal of the Iowa Academy of Science: JIAS
In this issue, the Iowa Academy of Science honors three of our colleagues who passed away in 2000. Duane Isely, Larry Eilers, and George Knaphus shared many of the same interests. All three were botanists, although George's research on fungi and heterotrophic protistans relegated him to the botany departments only by default. However, more importantly, all three were teachers. I believe that one of the lessons that they would have taught was the need to carefully document present patterns if we are to understand the future. However, many biologists poorly support this concept today.
Duane Isely (1918-2000): A Tribute, Stanley L. Welsh, Deborah Q. Lewis
Duane Isely (1918-2000): A Tribute, Stanley L. Welsh, Deborah Q. Lewis
Journal of the Iowa Academy of Science: JIAS
Duane Isely, Distinguished Professor Emeritus, Department of Botany, Iowa State University, Ames, Iowa, died on 6 December 2000. Dr. Isely was an outstanding plant taxonomist with expertise in other fields as well, especially in seed technology and weed identification and control. He was born in Bentonville, Arkansas, on 24 October 1918 into a family of academicians. His father, Dwight Isely, was professor and later Dean of Agriculture at the University of Arkansas, and his mother, Blessie Elise Dort Isely, also taught at the University of Arkansas and eventually received her Ph.D.
In Memoriam: George Knaphus, Lois H. Tiffany
In Memoriam: George Knaphus, Lois H. Tiffany
Journal of the Iowa Academy of Science: JIAS
George Knaphus, 75, died Saturday, 20 May 2000, after a two year battle with lymphoma. He was born at McCallsburg, Iowa and resided on a farm near there except during his WWII service years and his undergraduate college years at UNI until moving to Ames in 1998. He graduated from McCallsburg High School in 1942, served in the U.S. Army from 1943-45 in the 112th Infantry 28th division in Europe, and fought in the Battle of the Bulge, receiving the Bronze Star. He graduated with a B.S. in education from Iowa State Teachers College in 1949, earning master and doctorate …
Cover - Table Of Contents
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Identification And Distribution Of The Treefrogs Hyla Versicolor And Hyla Chrysoscelis In Iowa, Catherine E. C. Oberfoell, James L. Christiansen
Identification And Distribution Of The Treefrogs Hyla Versicolor And Hyla Chrysoscelis In Iowa, Catherine E. C. Oberfoell, James L. Christiansen
Journal of the Iowa Academy of Science: JIAS
Historically, the tetraploid and diploid species pair of gray treefrogs, Hyla versicolor and Hyla chrysoscelis, were mapped collectively in Iowa because no macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of nucleoli in the palpebral membrane of the eye and by measurement of scanning electron micrographs of toepad epithelial projections. Subsequent morphometric data confirm that the two species are morphologically distinct in Iowa but that overlap in characters continues to make macroscopic morphology unreliable for identifying individuals. H. chrysoscelis is distributed sporadically though all …
Profitability Of Crop Rotations In Iowa In A Stress Environment, Derrick N. Exner, R. M. Cruse
Profitability Of Crop Rotations In Iowa In A Stress Environment, Derrick N. Exner, R. M. Cruse
Journal of the Iowa Academy of Science: JIAS
Small grains crops have traditionally been included in Midwestern cropping systems, but their use is restricted by uncertain yields, poor prices, and lack of on-farm uses in operations without livestock. We compared the corn (Zea mays L.)-soybean (Glycine max (L.) Merr.) crop rotation to actual or simulated three-yr rotations at two sites in Iowa between 1986 and 1989. Water was generally more limiting than was nitrogen, which produced minimal response in the corn to which it was applied. April-November precipitation at Nashua, Iowa ranged from 59 to 111 % of average, while at Des Moines, Iowa it was 77% of …
Myxomycetes Of Big Bend National Park, Texas, Lois H. Tiffany, George Knaphus
Myxomycetes Of Big Bend National Park, Texas, Lois H. Tiffany, George Knaphus
Journal of the Iowa Academy of Science: JIAS
Seventy species of Myxomycetes have been collected directly in the field or observed later in the laboratory from field materials in moist chambers from Big Bend National Park, Texas. Collections were made over a 10 year period, 1989-1997 and 1999, during intensive seven-day fungus collecting trips to Big Bend in late September each year. McGraw (1968) in an earlier study of Texas Myxomycetes had reported 28 species from Big Bend, some of which were also found in this study. A total of 81 species are reported from the park. A variety of environmental conditions occurred during the 10 years with …
Editorial Board & Iowa Academy Of Science Officers And Directors
Editorial Board & Iowa Academy Of Science Officers And Directors
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Recent Observations Of The Distribution And Status Of Bluntnose Darters And Crystal Darters In Iowa, Melvin C. Bowler
Recent Observations Of The Distribution And Status Of Bluntnose Darters And Crystal Darters In Iowa, Melvin C. Bowler
Journal of the Iowa Academy of Science: JIAS
The distribution and status of Iowa's fishes were last extensively described in Iowa Fish and Fishing (Harlan et al. 1987). Since then, numerous fish collections have been made in Iowa's interior and bordering rivers and streams. Excluding non-native species, there have been three documented accounts of new fish species distributional records in Iowa since 1987. In this paper, I describe new collections of crystal darter (Crystallaria asprella) and bluntnose darter (Etheostoma chlorosomum) from the Mississippi River. The first documented specimen of C. asprella in Iowa was collected in Pool 11 of the Upper Mississippi River (UMR) in 1995. One specimen …
In Memoriam: Larry Eilers, Paul A. Christiansen
In Memoriam: Larry Eilers, Paul A. Christiansen
Journal of the Iowa Academy of Science: JIAS
Larry came to botany along an unusual route. His first college degree was in engineering. After a stint at secondary teaching Larry worked at Collins Radio in Cedar Rapids, then returned to UNI (SCI then) and took a master's degree in biology, He continued his study at the University of Iowa under Dr. Robert Thorne and took his Ph.D. in 1964. He did the flora of the Iowan Surface (the Iowan Drift in those days). He taught at Syracuse University and University of Indiana at Terra Haute before joining the faculty of the University of Northern Iowa.
Expression Of Heterosis In Leaming And Midland Corn Belt Dent Populations, M. J. Carena, A. R. Hallauer
Expression Of Heterosis In Leaming And Midland Corn Belt Dent Populations, M. J. Carena, A. R. Hallauer
Journal of the Iowa Academy of Science: JIAS
Successful maize (Zea mays 1.) breeding programs are based on specific heterotic patterns. The Iowa Stiff Stalk Synthetic x Lancaster Sure Crop heterotic pattern is widely exploited in U.S. maize breeding programs. Alternative U.S. heterotic patterns have been suggested, but they have received limited attention and improvement. The objectives of this study were to evaluate cultivar crosses between Leaming and Midland Yellow Dent cultivars before and after inbred progeny selection and to assess their potential as an alternative U.S. heterotic pattern. Grain yield had a midparent heterosis value of 4.9% before selection and 17.8% in the third cycle of selection. …
Toxicity Of Cedar River Water And Sediment To Larval Walleye, Todd A. Phillips, Robert C. Summerfelt
Toxicity Of Cedar River Water And Sediment To Larval Walleye, Todd A. Phillips, Robert C. Summerfelt
Journal of the Iowa Academy of Science: JIAS
Although all anthropogenic stressors affecting aquatic ecosystems have not been isolated, suspended solids, sediment, and pesticides are believed to be major factors in agroecosystems. In the spring of 1998 and 1999, static 48-h tests were conducted to determine the toxicity of water and sediment collected from the Cedar River to prolarval, postlarval I, and postlarval II walleye (Sttzostedzon vitreum). River water and sediment were not more toxic to any larval stage of walleye than reference water and sediment. Cedar River sediments, suspended solids, and water were examined for occurrence of the most common herbicides and insecticides in Iowa. No pesticides …
Cover - Table Of Contents
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Low-Saturated-Fat Soybean Oil Reduces Saturated Fat In School Menus, J. M. Mahnken, S. F. Lutz, C. J. Anders, W. R. Fehr
Low-Saturated-Fat Soybean Oil Reduces Saturated Fat In School Menus, J. M. Mahnken, S. F. Lutz, C. J. Anders, W. R. Fehr
Journal of the Iowa Academy of Science: JIAS
This study evaluated the impact of using low-saturated-fat soybean {Glycine max (L.) Merr.} oil on the saturated fat content of school menus. Seventy-six weekly menus were obtained from the Iowa Department of Education during School Meals Initiative reviews for the 1996-1997 school year. Three modifications were performed on school menus using the Nuttikids computer program: Low-saturated- fat (LSF) soybean oil replaced traditional vegetable oil in menu items; LSF soybean oil was substituted for traditional vegetable oil, solid fats, and egg yolks in recipes; and a menu simulation was conducted where oils and solid fats used in menu items were …
Factors Associated With Occurrence And Density Of Wetland Birds In The Prairie Pothole Region Of Iowa, Steve E. Fairbairn, James J. Dinsmore
Factors Associated With Occurrence And Density Of Wetland Birds In The Prairie Pothole Region Of Iowa, Steve E. Fairbairn, James J. Dinsmore
Journal of the Iowa Academy of Science: JIAS
Wetlands within wetland complexes in northwestern, north-central, and central Iowa were surveyed for bird use in 1997 and 1998. Species occurrence, species richness, and density of nesting species were related to wetland habitat variables. A habitat diversity index measuring the evenness of distribution of the different habitats within a wetland was the best predictor of species richness in both years. The habitat diversity index was also the best predictor of the occurrence of individual species in both 1997 and 1998. Eight of 11 species (7 3%) in 1997 and 13 of 18 species (72%) in 1998 had greater densities in …
Awards And Recognition, Iowa Academy Of Science, 2000
Awards And Recognition, Iowa Academy Of Science, 2000
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Editorial Board & Iowa Academy Of Science Officers And Directors
Editorial Board & Iowa Academy Of Science Officers And Directors
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Editorial Board & Iowa Academy Of Science Officers And Directors
Editorial Board & Iowa Academy Of Science Officers And Directors
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Peirces Zeichenbegriff: Seine Funktionen, Seine Phänomenologische Grundlegung Und Seine Differenzierung, Michael H.G. Hoffmann
Peirces Zeichenbegriff: Seine Funktionen, Seine Phänomenologische Grundlegung Und Seine Differenzierung, Michael H.G. Hoffmann
Michael H.G. Hoffmann
No abstract provided.