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Articles 14341 - 14370 of 19329

Full-Text Articles in Science and Mathematics Education

Astronomy Bulletin - The 1990 Summer Sky, P. Steven Leiker Jan 1990

Astronomy Bulletin - The 1990 Summer Sky, P. Steven Leiker

Iowa Science Teachers Journal

No abstract provided.

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Science Notes - New Ists Officers Elected, Stephanie A. Althof Jan 1990

Science Notes - New Ists Officers Elected, Stephanie A. Althof

Iowa Science Teachers Journal

The Iowa Science Teachers Section recently held elections for the offices of president-elect and secretary. Jim Kubichek and Sharon J. Fisher were selected for these respective positions in a voting process that included over 200 ISTS members.

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Science Notes - American Geological Institute Offers Careers Brochure, Stephanie A. Althof Jan 1990

Science Notes - American Geological Institute Offers Careers Brochure, Stephanie A. Althof

Iowa Science Teachers Journal

The American Geological Institute (in cooperation with the American Association of Petroleum Geologists and the Geological Society of America) is offering its brochure titled "Careers in the Geosciences" free of charge to interested educators.

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Science Notes - United Nations Offers Environmental Education Publication, Stephanie A. Althof Jan 1990

Science Notes - United Nations Offers Environmental Education Publication, Stephanie A. Althof

Iowa Science Teachers Journal

The United Nations' Educational, Scientific and Cultural Organization is currently producing a newsletter focusing on environmental education.

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Science Notes - National Institute Of General Medical Sciences Offers The Structures Of Life, Stephanie A. Althof Jan 1990

Science Notes - National Institute Of General Medical Sciences Offers The Structures Of Life, Stephanie A. Althof

Iowa Science Teachers Journal

The National Institute of General Medical Sciences has made available its publication titled The Structures of Life: Discovering the Molecular Shapes that Determine Health or Disease.

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Editor's Corner - Quality Teachers = Quality Pupils, James J. Hungerford Jan 1990

Editor's Corner - Quality Teachers = Quality Pupils, James J. Hungerford

Iowa Science Teachers Journal

Effective teaching has always been a difficult task. But a hard job done well has always been satisfying regardless of one's management style. Management and evaluation styles may change, but effective teaching has always been proven by having all of the students doing high-quality work.

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Science Notes Policy Jan 1990

Science Notes Policy

Iowa Science Teachers Journal

No abstract provided.

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Recycling Paper To Save Landfills And Trees, William H. Gilbert Jan 1990

Recycling Paper To Save Landfills And Trees, William H. Gilbert

Iowa Science Teachers Journal

While some groups want to save tropical rain forests or marshy wetlands, other conservation-minded groups are interested in judiciously using sanitary landfills, or at least lengthening their lifetime by recycling paper (Hovelson, 1989). The Rolling Hills Audubon Society (RHAS), centered in Indianola (Warren County), sponsored two newspaper collections during 1989 in hopes of raising funds and reducing waste paper going to the South Central Iowa Sanitary Landfill located east of Winterset and south of Highway 92 in Madison County.

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Women And Minorities In Technical Courses In Iowa, Myrna Whigham Jan 1990

Women And Minorities In Technical Courses In Iowa, Myrna Whigham

Iowa Science Teachers Journal

Recent national reports indicate that math and science education is in a crisis in the United States (Changing America, 1988 and Women and Minorities in Science and Engineering, 1988). Concern has been expressed by many national groups that we must attract and keep more young people in the pipeline to meet future needs for scientists and engineers. Because the need for scientists is projected to increase by 45 percent, for engineers 32 percent and for technicians 36 percent, but the population of 18-24 year olds entering the labor force is expected to decline, the U.S. must attract more women and …

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Science Notes - Governor's Conference On Science, Mathematics And Technology Education Jan 1990

Science Notes - Governor's Conference On Science, Mathematics And Technology Education

Iowa Science Teachers Journal

The Iowa Alliance for Science will sponsor the Fourth Annual Governor's Conference on Science, Mathematics and Technology Education on February 11, 1991, at the Des Moines Marriott Hotel. The purpose of the conference is to assist individuals in improving education by using community resources through public-private partnerships.

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Science Notes - Could Your Computer Be A Safety Hazard? Jan 1990

Science Notes - Could Your Computer Be A Safety Hazard?

Iowa Science Teachers Journal

The July 1990 issue of Mac World discussed the issue of display terminal safety. The evidence that display monitors emit significant radiation which may be strong enough to be a health hazard has been mounting since the early 1980's. After conducting their own tests, the publishers of MacWorld concluded that extremely low-frequency magnetic field emissions from monitors are worrisome.

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Science Notes - Contribute To Chemsource Jan 1990

Science Notes - Contribute To Chemsource

Iowa Science Teachers Journal

ChemSource is a new project designed to provide detailed support for inexperienced secondary school chemistry teachers (pre-service teachers or inservice teachers in their first three years of chemistry teaching). The two major components that will be developed, piloted, revised, tested and disseminated over the next three years are SourceBook and SourceView. The project is funded by the National Science Foundation and originated in the Society Committee on Education of the American Chemical Society. Its principal investigator is Mary Virginia Orna.

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Science Notes - Acs Offers Minigrants For High School Teachers, Stephanie A. Althof Jan 1990

Science Notes - Acs Offers Minigrants For High School Teachers, Stephanie A. Althof

Iowa Science Teachers Journal

The American Chemical Society (ACS) is again sponsoring its Minigrant program, offering high school teachers up to $1000 in materials development funds. Applications for the 1991-92 school year are now available and the application deadline is March 15, 1991.

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Science Notes - Being A Pet Parent, Stephanie A. Althof Jan 1990

Science Notes - Being A Pet Parent, Stephanie A. Althof

Iowa Science Teachers Journal

Lifetime Learning Systems, Inc., offers a unique packet designed to teach students the responsibilities involved in owning a pet. Designed for students in grades 4-6, Being a Pet Parent allows students to explore the similarities between their parents' responsibility to them and the responsibilities they would have if they were to have a pet.

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Science Notes - Free Booklets On Groundwater And Recycling, Gail George Jan 1990

Science Notes - Free Booklets On Groundwater And Recycling, Gail George

Iowa Science Teachers Journal

The Iowa Department of Natural Resources is offering booklets on groundwater and recycling at no cost to Iowa educators.

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Science Notes - Water Education Packet Offered, Stephanie A. Althof Jan 1990

Science Notes - Water Education Packet Offered, Stephanie A. Althof

Iowa Science Teachers Journal

The American Water Works is offering its water education curriculum packet free-of-charge to interested educators.

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Science Notes - Scientific American Sponsors Series On Pbs, Stephanie A. Althof Jan 1990

Science Notes - Scientific American Sponsors Series On Pbs, Stephanie A. Althof

Iowa Science Teachers Journal

Scientific American magazine recently began production of a new five-part science-related series for public television. "Scientific American Frontiers," underwritten by GTE corporation, airs on PBS once a month from October through February. Exact dates vary each month.

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Science Notes - Art Of Science Competition Suspended For 1991, Stephanie A. Althof Jan 1990

Science Notes - Art Of Science Competition Suspended For 1991, Stephanie A. Althof

Iowa Science Teachers Journal

The New York Academy of Science recently announced a suspension of its annual Art of Science Competition this year. The decision was a result of budget cutbacks in the National Science Foundation (a major supporter of the program) and an unexpected phasing-out of a multi-year grant from Dow Chemical U.S.A. (the competition's major corporate sponsor since 1988).

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Iowa Science Teachers Section 1990-91 Regional Directors Jan 1990

Iowa Science Teachers Section 1990-91 Regional Directors

Iowa Science Teachers Journal

No abstract provided.

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Editor's Corner - Responsible Actions, Carl W. Bollwinkel Jan 1990

Editor's Corner - Responsible Actions, Carl W. Bollwinkel

Iowa Science Teachers Journal

In these times of expressed concern about our environment, the ancient truth, "Actions speak louder than words," is worth serious thought. Most newspapers and news magazines carry a few columns of words about the environment. This journal is no exception.

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Editorial Office & Staff; Officers, Iowa Academy Of Science; Executive Board & Regional Directors, Iowa Science Teachers Section Jan 1990

Editorial Office & Staff; Officers, Iowa Academy Of Science; Executive Board & Regional Directors, Iowa Science Teachers Section

Iowa Science Teachers Journal

No abstract provided.

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Cover - Table Of Contents Jan 1990

Cover - Table Of Contents

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

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Gene Transfer In Crop Improvement - An Introduction And Overview, Robert M. Goodman Jan 1990

Gene Transfer In Crop Improvement - An Introduction And Overview, Robert M. Goodman

Journal of the Iowa Academy of Science: JIAS

The application of recombinant DNA technology to plant breeding promises important applications in agriculture and advances in many plant science disciplines. Gene transfer at the molecular level can be routinely accomplished in an increasing number of plant species. For many of the world's important crops, new methods or refinements of proven methods will be needed and are being developed. Experience with gene regulation in transgenic plants is accumulating in many laboratories around the world. The action of any particular gene cannot be predicted precisely without reference to the genetic background in which it acts, but, qualitatively speaking, the cis-acting elements …

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Engineering Proteinase Inihibitor Genes For Plant Defense Against Predators, Clarence A. Ryan, Thomas Moloshok, Gregory Pearce, Gynhueng An, Robert W. Thornburg, Gerald Hall, Russell Johnson, Edward E. Farmer, Curtis Palm Jan 1990

Engineering Proteinase Inihibitor Genes For Plant Defense Against Predators, Clarence A. Ryan, Thomas Moloshok, Gregory Pearce, Gynhueng An, Robert W. Thornburg, Gerald Hall, Russell Johnson, Edward E. Farmer, Curtis Palm

Journal of the Iowa Academy of Science: JIAS

Small proteinaceous inhibitors (Mr<20,000) of the digestive serine proteinases of animals and microorganisms are found as moderately abundant proteins in storage organs and leaves of many plant genera. The proteins are powerful inhibitors of the digestive enzymes of plant predators and therefore are considered to be part of the array of defensive chemicals of plants. Proteinase inhibitor genes show excellent promise, using DNA technology, to manipulate plant genomes to express these biologically active proteins in order to improve natural defense systems. Members of two unrelated families of serine proteinase inhibitors found in tomato and potato plants, called Inhibitor I (monomer Mr 8000) and Inhibitor II (monomer Mr 12,300), are under both environmental and developmental regulation in different tissues of the plants. Genes coding for wound-inducible Inhibitors I and II have been isolated from both tomato and potato genomes and characterized. Tobacco plants have been transformed with the chimeric genes containing wound-inducible promoters fused with the reporter gene, chloramphenicol acetyl transferase, to assess promoter function and signal transmission. Transacting factors that regulate their expression in response to wounding are also being identified and purified. Intact genes are being employed to transform agriculturally important crop plants to determine their potential usefulness to enhance defensive capabilities of plants against herbivores and pathogens.

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Characteristics Of Channel Catfish Populations In Streams And Rivers Of Iowa With Varying Habitats, Vaughn L. Paragamian Jan 1990

Characteristics Of Channel Catfish Populations In Streams And Rivers Of Iowa With Varying Habitats, Vaughn L. Paragamian

Journal of the Iowa Academy of Science: JIAS

From 1983 co 1985, more than 1,000 channel catfish (Icatalurus punctatus) were sampled with rotenone from 50 streams and rivers in Iowa to assess differences in population densities, standing stocks, viral statistics, age and growth, and habitat use Catfish densities ranged from 5 fish/ha in sites on the South Skunk and Upper Iowa Rivers to more than 4,400 fish/ha at a site on the Thompson Fork of the Grand River. Standing stocks ranged from a low of 0.1 kg/ha on a site on the South Skunk River to a high of 467 kg/ha on the East Fork of the Des …

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Climate Change And The Potential Impact On The Soil Resource, J. L. Hatfield Jan 1990

Climate Change And The Potential Impact On The Soil Resource, J. L. Hatfield

Journal of the Iowa Academy of Science: JIAS

Climatic change will lead to changes in the carbon dioxide C02, temperature, and precipitation. There have been many predictions of the effect of climatic change on plant growth but none on the soil parameters or water use. To fully understand the implications on soil management from climate change the expected changes in soil temperature, water use, and water and nutrient use efficiency need quantification.

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Radon Measurements In Houses In Eastern And Central Iowa, C. V. Weiffenbach, T. J. Hart Jan 1990

Radon Measurements In Houses In Eastern And Central Iowa, C. V. Weiffenbach, T. J. Hart

Journal of the Iowa Academy of Science: JIAS

Radon concentrations in air in main floor areas of 213 houses in Central and Eastern Iowa were measured with alpha track detectors integrating over periods of five months to one year. Forty-two houses in Central Iowa had significantly higher radon concentrations (lognormal distribution with geometric mean 2.1 pCi/L, geometric standard deviation 2.2, and arithmetic mean 2.75 pCi/L) than 171 houses studied in Eastern Iowa (geometric mean 1.6 pCi/L, geometric standard deviation 2.2, arithmetic mean 2.1 pCi/L). Significant differences in radon levels were found among different categories of houses with regard to ventilation rate, basement construction, and cracks and openings in …

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Cover - Table Of Contents Jan 1990

Cover - Table Of Contents

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

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The Effect Of Harvesting On Macrophyte Regrowth And Water Quality In Ladue Reservoir, Ohio, G. Dennis Cooke, Angela B. Martin, Robert E. Carlson Jan 1990

The Effect Of Harvesting On Macrophyte Regrowth And Water Quality In Ladue Reservoir, Ohio, G. Dennis Cooke, Angela B. Martin, Robert E. Carlson

Journal of the Iowa Academy of Science: JIAS

Two experiments in a bay of LaDue Reservoir (Geauga Co., northeastern Ohio) during summer, 1985 demonstrated that removal of Eurasian watermilfoil (Myriophyllum spicatum L.) root crowns with an aquatic weed harvester retarded plant regrowth to quantities well below nuisance levels for 28 days. Nearly summer-long control was achieved following a "touch-up" harvest on day 42. In contrast, the harvester was used in this bay in 1982 to "mow" milfoil, leaving intact "stumps." The mowed plants regrew to preharvest and control area biomass levels within 23 days. The difference in plant regrowth between these two methods strongly suggests that user dissatisfaction …

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Plant Parasitic Fungi Of Four Tallgrass Prairies Of Northern Iowa: Distribution And Prevalence, Lois H. Tiffany, Judy F. Shearer, George Knaphus Jan 1990

Plant Parasitic Fungi Of Four Tallgrass Prairies Of Northern Iowa: Distribution And Prevalence, Lois H. Tiffany, Judy F. Shearer, George Knaphus

Journal of the Iowa Academy of Science: JIAS

Throughout the 1980's, most intensively during the past five years, collections of fungal parasites of prairie plants have been made at various times of the growing season from four prairie preserves, Cayler, Freda Haffner Kettlehole, Hayden, and Stinson prairies, in northern Iowa. A total of 216 species of parasitic fungi were collected on 129 prairie plant hosts. Ninety-nine of the fungi were not previously documented from Iowa. Also, fungus species previously reported were found on 72 host species not included in earlier records.

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