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Articles 841 - 870 of 931
Full-Text Articles in Education
Special Issue Photo: Richard V. Bovbjerg, Director Of The Iowa Lakeside Laboratory 1963-1989
Special Issue Photo: Richard V. Bovbjerg, Director Of The Iowa Lakeside Laboratory 1963-1989
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Changes In A Prairie Bird Population From 1940 To 1989, Neil P. Bernstein, Kristine K. Baker, Sherry R. Wilmot
Changes In A Prairie Bird Population From 1940 To 1989, Neil P. Bernstein, Kristine K. Baker, Sherry R. Wilmot
Journal of the Iowa Academy of Science: JIAS
We repeated a bird census of a prairie/field community that was done by Kendeigh (1941) in 1940. Changes in the bird populations were compared with changes in vegetation, agricultural land use for the county, and trends in urbanization. Grassland birds did decline in abundance due to causes similar to those cited in other studies. The increase in forest and edge nesting species was more unusual to this study, and probably correlated with the woody succession that had occurred.
Time To Metamorphosis As A Function Of Larval Size In A Population Of Ambystoma Tigrinum Salamanders Consisting Of Cannibal And Typical Morph Phenotypes, Michael J. Lannoo, Michael P. Sweet, Nancy M. Ladehoff, Edmund S. Fangman, William B. Collins
Time To Metamorphosis As A Function Of Larval Size In A Population Of Ambystoma Tigrinum Salamanders Consisting Of Cannibal And Typical Morph Phenotypes, Michael J. Lannoo, Michael P. Sweet, Nancy M. Ladehoff, Edmund S. Fangman, William B. Collins
Journal of the Iowa Academy of Science: JIAS
Salamander larvae of the species Ambystoma tigrinum are dimorphic in northwestern Iowa. In addition to common typical morphs, there exist rare, specialized cannibal morphs, which are induced environmentally by crowding. Cannibal morph phenotypes are characterized morphologically by their large size, proportionately large heads and hypertrophied vomerine teeth, and behaviorally by facultative cannibalism. During metamorphosis amphibians are particularly sensitive to predation. To help understand why cannibal morphs are uncommon, we have raised cannibal and typical morphs in isolation and under crowded conditions to compare the timing and duration of metamorphosis between these morphs. Results show that larger larvae, most of which …
The Cladocera Of Lake West Okoboji, Iowa - Revisited, Kenneth L. Lang
The Cladocera Of Lake West Okoboji, Iowa - Revisited, Kenneth L. Lang
Journal of the Iowa Academy of Science: JIAS
Seven stations, established in 1968 to sample Cladocera, were sampled again, using the same methods, in 1988. Seven species, all of them in low abundance, are new records for Lake West Okoboji. In 1988, there was little difference 1) in the ranking of the stations relative to abundance of cladocerans, 2) the distribution and abundance of the species by habitat-type, 3) the seasonality of the predominant species in the specific habitats, 4) the temporal patterns of the number of species and total cladoceran abundance in the specific habitats, compared to 1968. On the average there were more species but lower …
Holocene Vegetational Changes In Eastern Iowa, R. G. Baker, C. A. Chumbley, P. M. Witinok, H. K. Kim
Holocene Vegetational Changes In Eastern Iowa, R. G. Baker, C. A. Chumbley, P. M. Witinok, H. K. Kim
Journal of the Iowa Academy of Science: JIAS
Pollen and plant macrofossil analysis from three sites along an east-west transect in southeastern Iowa provide evidence for Holocene vegetational development. Colo Marsh at the west end of the transect is relatively complete, with a late-glacial spruce zone ending about 11,500 yr B.P.; a deciduous forest zone from about 11,500 to 8300; a prairie zone from 8300 to 4500, and prairie with oak from 4500 to presettlement times.
Sediments from the site at the Indian Creek Nature Center, midway in the transect, date only from about 6000 to 1600 yrs B. P. This site also was dominantly prairie from 6000 …
A Summer Course In Invertebrate Developmental Biology At Iowa Lakeside Laboratory: A Unique Experience, Carol W. Schutte, Dale J. Witt, Nicole Y. Janosek, Douglas E. Robinson, Edwin C. Powell, George G. Brown
A Summer Course In Invertebrate Developmental Biology At Iowa Lakeside Laboratory: A Unique Experience, Carol W. Schutte, Dale J. Witt, Nicole Y. Janosek, Douglas E. Robinson, Edwin C. Powell, George G. Brown
Journal of the Iowa Academy of Science: JIAS
The course, "Developmental Biology of Selected Invertebrates'', has been offered in alternate years at Iowa Lakeside Laboratory (Ill) on Lake West Okoboji, Dickinson County, Iowa, since the first summer session of 1983. This course has taken advantage of the great diversity of invertebrates found in the Ill area and has demonstrated to students and faculty alike the exciting phenomena and principles of developmental biology. The course is continuously evolving as new experiments and observations are discovered with each offering of the course.
Biological Pesticides: Biotechnology's Answer To Silent Spring, Donald H. Dean
Biological Pesticides: Biotechnology's Answer To Silent Spring, Donald H. Dean
Journal of the Iowa Academy of Science: JIAS
In the 25 years since the publication of Rachel Carson’s Silent Spring the public has come to realize the environmental impact of heavy use of chemical pesticides. To add insult to injury, many insects, including the disease vector, the mosquito, are now virtually resistant to standard chemical pesticides. Biotechnology is now providing a positive response to these dilemmas through the production and development of improved forms of microbial pest control agents: biological pesticides. Biological pesticides are pathogens, or predators, of insects such as bacteria, fungi, and viruses, and predatory insects or vertebrates such as mosquito fish which reduce the population …
Public Policy On The Introduction Of Genetically Engineered Microorganisms, Anne K. Vidaver
Public Policy On The Introduction Of Genetically Engineered Microorganisms, Anne K. Vidaver
Journal of the Iowa Academy of Science: JIAS
This presentation raises questions of research needs and issues. Underlying assumptions are that only beneficial or useful microorganisms will be "released"; that extensive laboratory and contained experiments will have been done prior to introduction and live microorganisms can be confined within the areas of introduction. Evidence to support these assertions will be presented. Critical needs for progress in this area include: 1) Recognition that the nature of the product introduced into the environment is of primary significance, not how the organism was genetically altered or modified. 2) Recognition that microorganisms are introduced into the environment as part of our daily …
Ada Hayden: A Tribute, Duane Isely
Ada Hayden: A Tribute, Duane Isely
Journal of the Iowa Academy of Science: JIAS
Dr. Ada Hayden was a member of the Iowa State College of Botany faculty, 1920-1950. Her floristic studies of the lake region in northern Iowa are possibly the most authoritative for any part of the state. Hayden was curator of the Iowa State herbarium, 1934-1950, and contributed immeasurably to its development. This research facility has recently been named the Ada Hayden Herbarium. In the sense that L. H. Pammel was father of the Iowa State park system, her bequest is the state preserves. After some 25 years as a conservation activist, she published descriptions of 22 prairie areas in ten …
Plant-Parasitic Nematodes In Iowa, Don C. Norton
Plant-Parasitic Nematodes In Iowa, Don C. Norton
Journal of the Iowa Academy of Science: JIAS
Ninety-nine species of plant-parasitic nematodes are recorded from Iowa. Twenty-seven are new state records. Most samples were collected from around maize or from prairies or woodlands. Similarity (Sorensen's index) of species was highest for the maize-prairie habitats (0.49), compared with maize-woodlands (0. 23), or prairie-woodland (0. 3 7) habitats. Nematode communities were most diverse in prairies with a Shannon-Weiner index (H') of 2.74, compared with 1.65 and 1.07 for woodlands and maize habitats, respectively. Evenness of species (J') was 0.41, 0.78, and 0.48 for maize, prairies, and woodlands, respectively.
Effects Of Intensive Training On Prolactin Responses To Submaximal Exercise In Males, A. C. Hackney, R. L. Sharp, W. S. Runyan, R. J. Ness
Effects Of Intensive Training On Prolactin Responses To Submaximal Exercise In Males, A. C. Hackney, R. L. Sharp, W. S. Runyan, R. J. Ness
Journal of the Iowa Academy of Science: JIAS
The purpose of this study was to determine if serum prolactin responses to submaximal exercise were affected by 8 weeks of intensive training (5 cl/wk, 90 min/d 65-200% V02max). Nine males performed 90 minute continuous exercise bouts (cycle ergometry; 65% V02 max) at the end of 1, 4, and 8 weeks of training. Blood samples were obtained pre-training, and pre-, post-exercise. Significant differences were not seen in pre- and post-exercise prolactin levels at weeks 1 and 4. However, at week 8 the post-exercise prolatin was significantly greater than the pre-exercise levels (6.8 ± 0.9 vs 3.8 ± …
Additions To The Iowa Pteridophyte Flora - Iii, James H. Peck
Additions To The Iowa Pteridophyte Flora - Iii, James H. Peck
Journal of the Iowa Academy of Science: JIAS
To prior reports on the studies of the Iowa pteridophyre flora, five taxa (Botrychium campestre Wagner & Farrar, Botrychimn matricariifolium A. Braun, CyJtopterislragilis (L) Bernh., Cystopteris laurentiana (Weath.) Blasdell, and Lycopodium inundatum L.) are added, along with 215 new county occurrence records for 39 taxa. Currently, the Iowa preridophyte flora consists of 70 taxa, supported with 1656 county occurrence records; only 72 (4%) of these records are based solely on collections made before 1950.
Semiquantitative Measurement Of Fission Produced Gamma Ray Radioactivity In Soils At Dubuque, Iowa, James A. Dockal, James A. Dockal Sr.
Semiquantitative Measurement Of Fission Produced Gamma Ray Radioactivity In Soils At Dubuque, Iowa, James A. Dockal, James A. Dockal Sr.
Journal of the Iowa Academy of Science: JIAS
Residual fission-product radionuclide contamination (fallout) in soils at Dubuque, Iowa was evaluated with an Exploration geometrics gamma ray scintillometer in 1985 and after the Chernobyl accident in 1986. Anomalous amounts of gamma ray radiation were found near where downspouts discharged storm runoff from the roof of a dwelling. The 1985 residual cesium-13 7 activity in the soils of the area was found to be 0.2 pCi/gram with an areal contamination of 16 ± nCi/m2. Activities associated with the soils near the discharge points of the downspouts ranged as high as 8 pCi/gram. This contamination seems to have occurred prior to …
Index For Volume 96
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.
The Vascular Flora Of Pilot Knob State Preserve, William C. Watson
The Vascular Flora Of Pilot Knob State Preserve, William C. Watson
Journal of the Iowa Academy of Science: JIAS
Pilot Knob State Preserve is a 365 acre (147 ha) area lying within the boundaries of Pilot Knob State Park. Located in north central Iowa near the northeast corner of Hancock County, this preserve resides on the eastern morainal system of the Des Moines Lobe left from the Wisconsinan glaciation. The vegetation of the preserve is primarily a deciduous woodland on rolling hills interspersed with wetland habitats in the hollows. Iowa's only floating bog is present in one of these hollows and supports numerous vascular plants uncommon to the state. Two species, Carex cephalantha (Bailey) Bickn. and Drosera rotundifolia L., …
Ecology Of Iowa Drosophila Ii. Lowland Forest And Sand Prairie, Neil J. Jennings, Robert D. Seager
Ecology Of Iowa Drosophila Ii. Lowland Forest And Sand Prairie, Neil J. Jennings, Robert D. Seager
Journal of the Iowa Academy of Science: JIAS
The seasonal abundances of Drosophila species collected from a lowland forest community and from a sand prairie community in northeastern Iowa are compared. With some important exceptions, the patterns seen in the lowland forest community were similar to what had been observed in a previous collection (Jennings et al. 1985). Fewer species and many fewer individuals were collected from the sand prairie community, although in general the patterns seen were similar to those of the lowland forest community. Strong evidence of microhabitat differentiation was seen in both communities. In contrast to our previous study, none of the seasonal abundance patterns …
Program Abstracts, 101st Session, Iowa Academy Of Science, April 21-22, 1989, Buena Vista College
Program Abstracts, 101st Session, Iowa Academy Of Science, April 21-22, 1989, Buena Vista College
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.
Cover - Table Of Contents
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Hybrid Performance Of Sorghum Parental Lines Developed By Mass Selection And S1 Yield Testing, K. R. Ess, R. E. Atkins
Hybrid Performance Of Sorghum Parental Lines Developed By Mass Selection And S1 Yield Testing, K. R. Ess, R. E. Atkins
Journal of the Iowa Academy of Science: JIAS
Experiments were conducted co obtain information on the effects of two methods of developing parental lines from a random-mating population of sorghum (Sorghum bicolor L. Moench) on hybrid performance. Gridded mass selection for threshed panicle weight was used in developing IAP1R(M)C3: and a sister population, IAP4R(S1)C3, was advanced each cycle on the basis of grain yield of S1 families in replicated yield trials. Hybrids with male parents developed by mass selection did not differ significantly for grain yield and panicles/plant from those with parents chosen on the basis of S1 yield tests. The S1-selection hybrids …
Synthesis And Antibacterial Studies Of Some 2-Furanthiocarboxyhydrazones, Xiaorong Li, Zoumin Sun, James C. Chang
Synthesis And Antibacterial Studies Of Some 2-Furanthiocarboxyhydrazones, Xiaorong Li, Zoumin Sun, James C. Chang
Journal of the Iowa Academy of Science: JIAS
Seven 2-furanthiocarboxyhydrazones were prepared, 5-nitro-furaldehyde-2-furanthiocarboxyhydrazone from the reaction of 2-furanthiocarboxyhydrazide with 5-nitro-2-furaldiacetate and the others from the condensation of 2-furanthiocarboxyhydrazide with aldehydes: 2- furaldehyde, benzaldehyde, p-hydroxybenzaldehyde, o-methoxybenzaldehyde, o-vanillin, and salicylaldehyde. The seven 2-furanthiocarboxyhydrazones were tested for their antibacterial activities against Staphyloccocus aureus and Bacillus subtilis. 5-Nitro-2-furaldehyde-2- furanthiocarboxyhydrazone was found to display the strongest bacterotoxicity.
Release And Behavior Of Recombinant Bacteria In Field Studies, Steven E. Lindow
Release And Behavior Of Recombinant Bacteria In Field Studies, Steven E. Lindow
Journal of the Iowa Academy of Science: JIAS
Numerous opportunities exist for the utilization of genetically engineered microorganisms for useful purposes in agriculture and in waste management. An extremely diverse array of microorganisms is likely to be considered for such processes as biological control of plant pests, degradation of to toxic wastes, reclamation of rare metals and other processes. For some purposes, such as in the degradation of toxic materials, it may be possible to make biologically compromised microorganisms that will exist only in the presence of the toxic chemicals that they were designed to transform. A better understanding of the genetics, biology and physiology of microorgansims which …
Iowa Geology: The Early Years, Wayne I. Anderson
Iowa Geology: The Early Years, Wayne I. Anderson
Journal of the Iowa Academy of Science: JIAS
In 1975 on the occasion of the first one hundred years of the Iowa Academy of Science, Robert W. Hanson summarized the history of the organization. Additional historical accounts covering many of the science disciplines were published during the centennial year. Although geology was not treated separately in these special articles, the contributions of early geologists were important to the development of science in our state. Consequently, it is appropriate to consider the contributions of early geologists in Iowa in celebration of the one hundredth annual meeting of the Iowa Academy of Science. Included in the present report are the …
Annual Report Of The Iowa Academy Of Science, 1988-89, Paul E. Rider
Annual Report Of The Iowa Academy Of Science, 1988-89, Paul E. Rider
Journal of the Iowa Academy of Science: JIAS
Starting in 1976, annual reports have served as a continuing record of the activities of the Iowa Academy of Science. These augment a 100 year history of the Academy which was written in the centennial year of 1975.
This report covers the period from July 1, 1988 to June 30, 1989. It is based on the official records of the Academy (committee reports, Board minutes, correspondence) as well as the recollections, impressions and musings of the author, who is writing his first annual report.
Estimates Of Genetic Variability In F2 Maize Populations, Geng-Chen Han, A. R. Hallauer
Estimates Of Genetic Variability In F2 Maize Populations, Geng-Chen Han, A. R. Hallauer
Journal of the Iowa Academy of Science: JIAS
Maize (Zea mays L.) breeders emphasize selection within F2 populations derived from crosses of inbred lines: Studies of the inheritance of quantitative traits in maize have been conducted primarily for generically broad-based populations. Objectives of our study were to estimate the generic variability in F2 populations developed from crosses of related and unrelated lines and to determine the effects of five generations of random intermating of plants within F2 populations on the estimates of genetic variability. Estimates of additive genetic variability were greater in the unrelated line crosses, but the estimates were not significantly different before and …
Characterization Of Aminoisobutyric Acid Transport Systems In Mcf-8, A Line Of Malignant Mouse Mammary Epithelial Cells, Bruce A. Voyles
Characterization Of Aminoisobutyric Acid Transport Systems In Mcf-8, A Line Of Malignant Mouse Mammary Epithelial Cells, Bruce A. Voyles
Journal of the Iowa Academy of Science: JIAS
Uptake of α-aminoisobutyric acid (AIB) by MCF-8, a line of malignant mouse mammary epithelial cells derived from a D2 hyperplastic nodule outgrowth, was found to be mediated by two different transport systems. In actively dividing cells about 60% of total AIB uptake is mediated by an A-like system: transport was Na+ -dependent, was inhibited by N-methyl-AIB, was maximal at pH 7.5 and ceased at pH 6. Transport by this system was reduced by nearly 65% when cell division ceased in confluent cultures, but the addition of insulin and/or calf serum to the medium of quiescent cells restored activity. Transport by …