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Articles 3961 - 3990 of 6760
Full-Text Articles in Physical Sciences and Mathematics
Learning To Understand: Mathematical Preparation Of Prospective Teachers, M. Hannigan, V. Preston
Learning To Understand: Mathematical Preparation Of Prospective Teachers, M. Hannigan, V. Preston
Journal of Mathematics and Science: Collaborative Explorations
This paper describes the development of a two-course sequence in mathematics content for prospective elementary teachers. Community college and university personnel collaborated to develop a course sequence that would prepare prospective elementary teachers to teach mathematics with an understanding of concepts to support their abstract mathematical knowledge. The strategy was to begin with a broad vision and then focus on the smaller pieces which would achieve that vision. The course changes are validated by documents published by various educational and mathematical groups advocating an increased emphasis on teaching for understanding rather than rote learning. Significant change is difficult without support …
The Community College Of Philadelphia: Educating Teachers For A Changing World, K. Armstrong
The Community College Of Philadelphia: Educating Teachers For A Changing World, K. Armstrong
Journal of Mathematics and Science: Collaborative Explorations
No abstract provided.
Aims & Scope
Journal of Mathematics and Science: Collaborative Explorations
No abstract provided.
Cover - Table Of Contents
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Managing Seedling Emergence Of Cuphea In Iowa, W. W. Roath
Managing Seedling Emergence Of Cuphea In Iowa, W. W. Roath
Journal of the Iowa Academy of Science: JIAS
Cuphea, a western hemisphere genus of some 260 species, has been proposed as a domestic source of medium-chain fatty acids. These fatty acids are used primarily in soap and detergent manufacture and are presently extracted from imported tropical oils or from petroleum. Considerable difficulty in obtaining consistent plant stands with direct seeding has been experienced at two Iowa locations. Trials were initiated in 1987 and continued through 1994 to test various treatments upon seedling emergence of C. laminuligera Koehne, C lanceolata Ait., and hybrid C. viscosissima Jacq. X C. lanceolata. These treatments included planting depths from 1.3 to 6.4 cm, …
Book Review - The Iowa Breeding Bird Atlas, Louis B. Best
Book Review - The Iowa Breeding Bird Atlas, Louis B. Best
Journal of the Iowa Academy of Science: JIAS
The Iowa Breeding Bird Atlas is the first comprehensive statewide survey of Iowa's breeding birds. Through the efforts of over 500 people, every county in the state was sampled to provide a record of the composition and distribution of the bird life in Iowa. The project entailed dividing the state into 861 atlas blocks; 83% received at least some coverage and 71 % were completed. Information known through 1995 is included in the text, although the atlas project ended in 1990.
Introduction To The 1997 Symposium On Iowa's Declining Flora And Fauna, Cornelia F. Mutel
Introduction To The 1997 Symposium On Iowa's Declining Flora And Fauna, Cornelia F. Mutel
Journal of the Iowa Academy of Science: JIAS
In 1980, Iowa's biologists and ecologists gathered at the 92nd annual meeting of the Iowa Academy of Science to present a symposium on the state's declining flora and fauna. Papers were published a year later in a single issue of The Proceedings of The Iowa Academy of Science (Vol. 88, No. 1), which has since been widely cited and much used as a baseline for research efforts. The symposium was a noble undertaking, for although the highly altered composition of Iowa's presettlement ecology had been widely recognized throughout the previous century, no single publication or gathering to that date …
The Status Of Iowa's Lepidoptera, Dennis W. Schlicht, Timothy T. Orwig
The Status Of Iowa's Lepidoptera, Dennis W. Schlicht, Timothy T. Orwig
Journal of the Iowa Academy of Science: JIAS
Including strays, 122 species of butterflies have been confirmed in Iowa. However, since European settlement the populations of taxa of Iowa Lepidoptera have declined. While certain generalist species have experienced declines, species with life cycles that include native habitats, especially prairies and wetlands, have been particularly vulnerable. In a 1994 revision of the Iowa endangered and threatened species list, the Natural Resource Commission (NRC) listed two species of butterflies as endangered, five as threatened, and 25 as special concern, using general legal definitions of those rankings (NRC 1994). But after examining recent records, we have revised that list, using numbers …
Cover - Perspectives On The Declining Flora And Fauna Of Iowa: A Symposium, Part 2
Cover - Perspectives On The Declining Flora And Fauna Of Iowa: A Symposium, Part 2
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Perspectives On Iowa's Declining Amphibians And Reptiles, James L. Christiansen
Perspectives On Iowa's Declining Amphibians And Reptiles, James L. Christiansen
Journal of the Iowa Academy of Science: JIAS
Changes in range and abundance of Iowa's amphibians and reptiles can be deduced by comparing records from recent studies with excellent collections from Iowa by Professor R. M. Bailey made from 1938-1943 in addition to museum records accumulated before 1950. Additional recent data make necessary this updating of a similar study conducted in 1980. The current study finds many of our frogs to be in decline, some in a pattern from north to south, but most as a diffused loss of populations, probably as a result of habitat destruction. The crawfish frog, one of the two frogs considered threatened in …
Mammals Of Iowa: Holocene To The End Of The 20th Century, John B. Bowles, Daryl L. Howell, Richard P. Lampe, Howard P. Whidden
Mammals Of Iowa: Holocene To The End Of The 20th Century, John B. Bowles, Daryl L. Howell, Richard P. Lampe, Howard P. Whidden
Journal of the Iowa Academy of Science: JIAS
This review of Iowa's mammal fauna at the close of the 20th century summarizes changes in distributional patterns following Euroamerican settlement in the early 1800s. Data from historical records, museum specimens, and presettlement late Holocene fossils indicate presence of 69 resident mammals at that time. Hunting pressures and the conversion of prairie and forest to agricultural fields reduced the populations and ranges of many state mammals, and 14 species were extirpated by 1900. An additional 15 species are either uncommon or rare today, and the Iowa Department of Natural Resources lists four species as endangered, three as threatened and one …
Carrion Beetles (Coleoptera: Silphidae) Of Northeastern Iowa: A Comparison Of Baits For Sampling, David R. Coyle, Kirk J. Larsen
Carrion Beetles (Coleoptera: Silphidae) Of Northeastern Iowa: A Comparison Of Baits For Sampling, David R. Coyle, Kirk J. Larsen
Journal of the Iowa Academy of Science: JIAS
Carrion beetles (Coleoptera: Silphidae) were inventoried over a 8-week period from June into August of 1996 at 10 sites in 4 counties of extreme northeastern Iowa. Carrion preference and relative abundance of carrion beetles were studied by use of non-lethal pitfall traps constructed from large plastic plant pots and baited with aged fish, beef liver, chicken, or piglets. A total of 3,183 carrion beetles were collected, representing 11 different species. The most commonly encountered species of carrion beetles in northeastern Iowa included Necrophila americana (71.5%) and Oiceoptoma novaboracense (18.5%). When comparing baits, chicken and fish attracted the greatest number of …
Decline Of Iowa Populations Of The Regal Fritillary (Speyeria Idalia) Drury, Diane M. Debinskl, Liesl Kelly
Decline Of Iowa Populations Of The Regal Fritillary (Speyeria Idalia) Drury, Diane M. Debinskl, Liesl Kelly
Journal of the Iowa Academy of Science: JIAS
The Regal Fritillary butterfly, Speyeria idalia Drury (Lepidoptera: Nymphalidae, Argynninae), is a prairie endemic species which has exhibited a dramatic decline in Iowa during the last few decades. Tallgrass prairie is the primary habitat of S. idalia and the butterfly's presence is correlated with the presence of violets (Violaceae). Due to the extensive habitat fragmentation of Iowa prairies, both the butterfly and its host plant populations are limited primarily to unplowed, relatively pristine prairies. Thus, S. idalia is an excellent case study of a prairie endemic species. Here, we report on the results of a two-year survey of the insect …
The Fungi, Lichens, And Myxomycetes Of Iowa: A Literature Review And Evaluation, Lois H. Tiffany, George Knaphus
The Fungi, Lichens, And Myxomycetes Of Iowa: A Literature Review And Evaluation, Lois H. Tiffany, George Knaphus
Journal of the Iowa Academy of Science: JIAS
The fungi have been, and continue to be, a poorly documented portion of Iowa’s biological inheritance. Although many are perennially present in soil and plant debris and are crucially involved in the release and recycling of materials from organic residues or are partners with plant roots as mycorrhizae, they are not obvious until they produce fruiting structures such as mushrooms, boletes, brackets, puffballs, etc. The fungi causing plant disease are more obvious because of the reactions of their host plants; thus the earliest records of Iowa fungi are of ones causing plant diseases commonly referred to as mildews, rusts, and …
Iowa's Avifauna: Recent Changes And Prospects For The Future, James J. Dinsmore
Iowa's Avifauna: Recent Changes And Prospects For The Future, James J. Dinsmore
Journal of the Iowa Academy of Science: JIAS
Iowa's avifauna has changed dramatically since 1980. The state list now has 40 additional species and totals 398 species, the most of any vertebrate group. Four species that had not previously nested in Iowa (Ring-billed Gull, Great-tailed Grackle, House Finch, Eurasian Tree Sparrow) and four whose nesting populations had disappeared (Double-crested Cormorant, Sandhill Crane, Piping Plover, Least Tern) now breed regularly here. Little Blue Heron, Cattle Egret, White-faced Ibis, Mississippi Kite, Prairie Warbler, and Red Crossbill nested for the first time but do not have established nesting populations. Trumpeter Swan, Peregrine Falcon, Greater Prairie Chicken, and Sharp-tailed Grouse have been …
Safety Issues And Iowa Science Teachers, Jack A. Gerlovich, Ed Wilson, Rahul Parsa
Safety Issues And Iowa Science Teachers, Jack A. Gerlovich, Ed Wilson, Rahul Parsa
Journal of the Iowa Academy of Science: JIAS
The National Science Education Standards are providing an excellent blue print for improving science teaching for all students. However, the Standards are placing serious demands on teachers attempts to make science activities inquiry-based, real-life, open-ended, and directly applicable to today's students. This situation is further aggravated when teachers do not know essential science safety information from both federal and state governing agencies, as well as professional organizations. With proper training and tools, however, this problem can be positively addressed.
Index For Volume 105 - Notice Of Rate Increase
Index For Volume 105 - Notice Of Rate Increase
Journal of the Iowa Academy of Science: JIAS
No abstract provided.
Lack Of Genetic Variation In Cytochrome Bin A Population Of Smooth Softshell Turtles, David W. Weisrock, Tamara S. Haselkorn, Fredric J. Janzen
Lack Of Genetic Variation In Cytochrome Bin A Population Of Smooth Softshell Turtles, David W. Weisrock, Tamara S. Haselkorn, Fredric J. Janzen
Journal of the Iowa Academy of Science: JIAS
An important issue in intraspecific molecular phylogenetic studies concerns distribution of genetic variation within and among populations and, hence, within-population sample sizes used in analyses. To address this sampling issue, we sequenced a 795 base pair (bp) segment of the mitochondrial cytochrome b gene from 19 unrelated individuals from a Louisiana population of the smooth softshell turtle (Apalone mutica LeSueur). We found a complete lack of within-population variation in this large segment of mtDNA. This result supports the use of minimal within-population sample sizes in intraspecific molecular phylogenetic studies of Apalone using cytochrome b.
Test 1702s - S190: New Holland 3930 8x8 Diesel, Nebraska Tractor Test Lab
Test 1702s - S190: New Holland 3930 8x8 Diesel, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Test 1744: John Deere 8100t Diesel 16-Speed, Nebraska Tractor Test Lab
Test 1744: John Deere 8100t Diesel 16-Speed, Nebraska Tractor Test Lab
Nebraska Tractor Tests
EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …
Nebraska Summary: S326 Case-Ih C70, Nebraska Tractor Test Lab
Nebraska Summary: S326 Case-Ih C70, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Nebraska Summary 321: Massey Ferguson 8280 Diesel 18-Speed, Nebraska Tractor Test Lab
Nebraska Summary 321: Massey Ferguson 8280 Diesel 18-Speed, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA
The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data.
EXPLANATION OF THE TEST PROCEDURES
Purpose
The purpose of …
Nebraska Summary 277: Massey-Ferguson 4235 Diesel 18-Speed, Nebraska Tractor Test Lab
Nebraska Summary 277: Massey-Ferguson 4235 Diesel 18-Speed, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA
The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data.
EXPLANATION OF THE TEST PROCEDURES
Purpose
The purpose of …
Test 1896: Case Ih Cx 80/C 80 Diesel, Nebraska Tractor Test Lab
Test 1896: Case Ih Cx 80/C 80 Diesel, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Test 1779: Challenger Mt 425 Diesel, Nebraska Tractor Test Lab
Test 1779: Challenger Mt 425 Diesel, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.
Test 1803: Kubota M6800dt Diesel, Nebraska Tractor Test Lab
Test 1803: Kubota M6800dt Diesel, Nebraska Tractor Test Lab
Nebraska Tractor Tests
No abstract provided.