Physical Sciences and Mathematics Commons^™

Molecular Dynamics Simulation Of Biomolecular Systems, Wilfred Van Gunsteren, Dirk Bakowies, Roland Buergi, Indira Chandrasekhar, Markus Christen, Xavier Daura, Peter Gee, Alice Glaettli, Tomas Hansson, Chris Oostenbrink, Christine Peter, Jed Pitera, Lukas Schuler, Thereza Soares, Haibo Yu

Faculty of Science - Papers (Archive)

The group for computer-aided chemistry at the ETH Zurich focuses its research on the development of methodology to simulate the behavior of biomolecular systems and the use of simulation techniques to analyze and understand biomolecular processes at the atomic level. Here, the current research directions are briefly reviewed and illustrated with a few examples.

Conducting Polymer-Carbon Nanotubes Composites, May Tahhan, N. Barisci, Gordon G. Wallace

Faculty of Science - Papers (Archive)

During the course of this work, three different approaches to the formation of conducting polymer/carbon nanotube (CP/CNT) composites were investigated. The first approach involved the preparation of CNT dispersions using Poly methoxy aniline-5-sulfonic acid (PMAS) as a stabilizer. The second approach investigated involved the use of CNT as the dopant in the electropolymerization of CPs. The third approach involved the electrochemical deposition of a thin polymer film onto the surface of CNT paper. These CNT/CP composites were characterized to determine capacitance, conductivity and mechanical strength.

Phinocytic Loading Of Cytochrome C Into Intact Cells Specifically Induces Caspase-Dependent Permeabilization Of Mitochondria: Evidence For A Cytochrome C Feedback Loop, K. J. Gilmore, H. E. Quinn, M. R. Wilson

Faculty of Science - Papers (Archive)

Previous studies introduced cytochrome c into intact cells via the disruptive techniques of microinjection or electroporation to provide support for the hypothesis that, in whole cells, cytochrome c release from mitochondria triggers caspase activation and other degradative changes. However, the types of measurements that could be undertaken with these techniques was limited. We used the simple and relatively gentle technique of pinocytic loading to demonstrate that, in intact cells, cytosolic cytochrome c specifically induced activation of caspase-3- and -9-like enzymes, and a loss of mitochondrial polarization coincident with an increase in mitochondrial permeability. Our results support the prediction from in …

Values Of Minors Of (1,-1) Incidence Matrices Of Sbibds And Their Application To The Growth Problem, C Koukouvinos, M Mitrouli, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

We obtain explicit formulae for the values of the v j minors, j = 0, 1,2 of (1, -1) incidence matrices of SBIBD(v, k, λ). This allows us to obtain explicit information on the growth problem for families of matrices with moderate growth. An open problem remains to establish whether the (1, -1) CP incidence matrices of SBIBD(v, k, λ), can have growth greater than v for families other than Hadamard families.

The Application Of Iec 61000-3-6 To Mv Systems In Australia, Victor J. Gosbell, D A. Robinson, Sarath Perera, Alex Baitch

Faculty of Informatics - Papers (Archive)

IEC 61000-3-6 [1] comprises a number of stages and tests to determine harmonic emission allowances for customers connected to MV or HV networks. Of particular importance is the section concerning loads distributed along a feeder, each having a different fault level. Although a common situation, the treatment given in the IEC standard is poorly described, being largely illustrated by one atypical example. This allows simplifying assumptions to be made which are invalid in practical cases. This paper outlines a more general approach that is relatively easy to apply.

Design Of A High Temperature Superconductor Magnetic Energy Storage Systems, R L Causley, Christopher David Cook, Steve Gower

Faculty of Informatics - Papers (Archive)

The University of Wollongong (UoW) has received funding for the research and development of a 20 kJ high temperature superconducting magnetic energy storage device (HTS SMES). This SMES will be operated at 25 K in contrast to most existing HTS designs, which operate at 77K. This paper includes a literature review of the current technology for the configuration of the SMES coil and a summary of the work done at UoW to date. Solenoidal and toroidal coils designs are compared to determine which will provide the required level of energy stored for a minimum superconductor and device volume. The design …

Tests Of A Rotenone-Impregnated Bait For Controlling Common Carp, Joseph L. Bonneau, Dennis L. Scarnecchia

Journal of the Iowa Academy of Science: JIAS

An experimental rotenone-impregnated pelleted (approximately 10 mg/pellet) bait was tested in force-feeding and field-feeding experiments as a method of control for common carp (Cyprinus carpio). Mortality rates of force-fed fish ranged from less than 40% when fed one pellet to 100% when fed more than 10 pellets. Mortality occurred within 48 h. Mortality rates of control fish did not exceed 10%. In reservoir feeding trials in 1994 and 1995, carp were fed for 2-3 weeks on a non-toxic, vegetable-based bait dispensed by automatic feeders, followed by one feeding of the bait with rotenone added. Carp ceased feeding on the rotenone …

Tillage Effect On Soil Water Content And Soybean (Glycine Max) Yield In A Strip Intercropping System, M. Ghaffarzadeh, F. Garcia Prechac, M. M. Harbur, R. M. Cruse

Journal of the Iowa Academy of Science: JIAS

Soybean [Glycine max (L.) Merr.] response to strip-intercropping with corn (Zea may L.) and oat (Avena Jativa L.) interseeded with nondormant alfalfa (Medicago Jativa L.) may be affected by soil moisture. A three-crop strip-intercropping system of corn, soybean and oat interseeded with nondormant alfalfa was established to determine the effect of tillage system and row position on soil water content and grain yield in the soybean strip. The experiment was a split-plot design with three tillage treatments (conventional, CT; reduced, RT; and minimum tillage, MT) as main plot effects and three row positions (both edge rows and the center …

Species Specific Odds Of Occurrence Of Blackspot Among Fish From The Maple River In Western Iowa, John W. Mellen

Journal of the Iowa Academy of Science: JIAS

Odds ratio analysis was used to evaluate the relative likelihood of occurrence of blackspot (Neascus pyriformil, Chandler) infections among 14 species of fish collected from the Maple River in Buena Vista and Ida Counties in western Iowa. Prevalence estimates ranged from 0% to 47.4% with a mean prevalence of 11.9%. The rank ordering of odds ratios of infection allowed the species to be categorized as those with risks greater than, less than, and not different from average risk to infection within the Maple River sample. The species with the largest odds ratio was the bluntnose minnow, (Pimephales notatus) (odds ratio …

Book Review: I Have A Weird Brother Who Digested A Fly, Jan Handler

Journal of the Iowa Academy of Science: JIAS

I Have A Weird Brother Who Digested A Fly. Joan Holub. Illustrator, Patrick Girouard. 1999. Albert Whitman & Company, Morton Grove, IL. 21 pages. ISBN 0-8075-3506-0

You may never have been tempted to swallow a fly-nor even challenged to do so 'on a dare'-but there's a solid chance you've wondered about some of the mysteries of digestion. Joan Holub offers an engaging book to share with the young people in your life who may share an interest in the intrigues of human body processes.

Annual Meeting Of The Iowa Academy Of Science

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.

Front Matter

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

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

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

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 …

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.

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

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

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

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

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 …

Back Cover

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

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

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

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.

Front Matter

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

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 …