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Mineralization Of N In Swine Manure Amended Soils As A Function Of Soil Temperature, Moisture, And Texture, Brian J. Wienhold, Bahman Eghball

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Manure can serve as an effective fertilizer source if used properly or can lead to environmental contamination if used improperly. Proper use of manure requires some know ledge of the availability of nutrients contained in the manure. To better understand how soil and environmental variables effect N mineralization in manure amended soils a laboratory study was conducted to measure N-mineralization rates as a function of soil texture, water regime, and temperature. This study is part of a national effort to develop a model to predict nutrient availability from various manure sources across a range of soil and environmental conditions. There …

A Personal Account Of Creating The Sterile Insect Technique To Eradicate The Screwworm From Curacao, Florida And The Southeastern United States, Alfred H. Baumhover

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The history is recounted of developing the sterile insect technique to eradicate the screwworm, Cochliomyia hominivorax (Coquerel), from the Caribbean island of Curacao, Florida and the southeastern U.S. Observations of screwworm biology and challenges faced in conducting these eradication projects are described by the author who worked on all aspects of the research and field operations. Eradication was first demonstrated on Curacao, essentially a 170 mi² outdoor laboratory. The population dynamics of the wild screwworm was determined and overflooding ratios and dispersal patterns essential for population suppression were defined. Eradication was achieved with minimal resources by attacking the pest …

Threat Of Foreign Arthropod-Borne Pathogens To Livestock In The United States, Ralph A. Bram, John E. George, Robert E. Reichard, Walter J. Tabachnick

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

There are many exotic animal pathogens throughout the world that, if introduced into the United States, could have a significant detrimental impact on the health of livestock, agricultural economy, the environment, and public health. Many of these pathogens are arthropod-borne and potential vectors are readily available in the United States. A number of these arthropod-borne pathogens are discussed here as examples that illustrate the potential risk and the consequences of inadvertent introductions. Several International agencies have a role in global surveillance and in controlling animal diseases should they begin to expand their range. The risk to the United States is …

Soil- And Plant-Water Dynamics In A C3/C4 Grassland Exposed To A Subambient To Superambient Co2 Gradient, H. Wayne Polley, Hyrum B. Johnson, Justin D. Derner

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Plants may be more sensitive to carbon dioxide (CO₂) enrichment at subambient concentrations than at superambient concentrations, but field tests are lacking. We measured soil-water content and determined xylem pressure potentials and δ¹³C values of leaves of abundant species in a C3/C4 grassland exposed during 1997-1999 to a continuous gradient in atmospheric CO₂ spanning superambient concentrations (200-560 µmol mol^-1).

Arsenic(Iii) Oxidation And Arsenic(V) Adsorption Reactions On Synthetic Birnessite, Bruce A. Manning, Scott E. Fendorf, Benjamin Bostick, Donald L. Suarez

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The oxidation of arsenite (As(III)) by manganese oxide is an important reaction in both the natural cycling of As and the development of remediation technology for lowering the concentration of dissolved As(III) in drinking water. This study used both a conventional stirred reaction apparatus and extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the reactions of As(III) and As(V) with synthetic birnessite (MnO₂). Stirred reactor experiments indicate that As(III) is oxidized by MnO₂ followed by the adsorption of the As(V) reaction product on the MnO₂ solid phase. The As(V)-Mn interatomic distance determined by EXAFS analysis …

Differences Among Mycorrhizal Fungi For Mineral Uptake Per Root Length Of Switchgrass Grown In Acidic Soil, R. B. Clark

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Plants commonly encounter deficient and=or toxic levels of mineral elements when grown in acidic soil, and arbuscular mycorrhizal fungi (AMF) have potential to overcome many of these effects. Switchgrass (Panicum virgatum L.) was grown in acidic Lily soil (Typic Hapludult) at pH_Ca 4 and 5 (soil : 10mM CaCl₂, 1 : 1) and inoculated with Glomus (G.) clarum, G. diaphanum, G. etunicatum, G. intraradices, Gigaspora (Gi.) albida, Gi. margarita, Gi. rosea, and Acaulospora (A.) morrowiae to determine differences among mycorrhizal (AM) plants for mineral uptake per root length (RL). Shoots of AM plants grown …

On The Cover

Sci-Tech News

No abstract provided.

From The Editor, Bonnie Osif

Sci-Tech News

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Responding To Disaster, Chuck James

Sci-Tech News

No abstract provided.

Chemistry Division, Marilynn Dunker

Sci-Tech News

No abstract provided.

Engineering Division, Carol Reese

Sci-Tech News

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Aerospace Section, Thomas De Petro

Sci-Tech News

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Materials Research & Manufacturing Division

Sci-Tech News

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Web Reviews, David Hooks

Sci-Tech News

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New Science And Technology Journals, Earl Mounts

Sci-Tech News

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Sci-Tech Book News Reviews, Ellis Mount

Sci-Tech News

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Full Issue: Vol. 56, No. 1

Sci-Tech News

No abstract provided.

Threats, Free Speech, And The Jurisprudence Of The Federal Criminal Law, G. Robert Blakey, Brian J. Murray

Journal Articles

In these materials, we set out a road map for the task of reforming the jurisprudence of threats and an articulation of its rationale under the First Amendment. In addition, we examine the basic jurisprudence of the federal criminal law, in particular, its traditional roots in notions of individual responsibility based on personal conduct and state of mind. In Part I, we analyze the district court and the Ninth Circuit opinions in the American Coalition litigation. In Part II, we trace the traditional theory and practice of free speech under the First Amendment, rooted in the history and various rationales …

Authentic Field Ecology Experiences For Teachers, Marion Dresner, Andrew Moldenke

Environmental Science and Management Faculty Publications and Presentations

This paper will focus on one teacher field research experience situated in the Pacific Northwest

Markers Of Apoptosis: Methods For Elucidating The Mechanism Of Apoptotic Cell Death From The Nervous System, Paul G. Smyth, Stephen A. Berman, Sherry Bursztajn

Dartmouth Scholarship

Apoptosis is a highly conserved energy-requiring program for non-inflammatory cell death that is important in both normal physiology and disease. Numerous techniques have been used to study apoptosis. In the nervous system, apoptosis is necessary for normal development, but it also occurs in many acute and chronic pathologic conditions. This review places commonly used markers of apoptosis and their detection in the context of what is now known about the process of apoptosis. We review the potential role of apoptosis in nervous system and neurodegenerative disorders (Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis). We then describe important morphological, immunocytochemical, …

Review Of Blue Kansas, By Michael Bishop, Matthew Wolf-Meyer

Reconstruction: Studies in Contemporary Culture

No abstract provided.

On Public Culture 12.3: Special Issue On Cosmopolitanism (2000), Dorothy Barenscott

Reconstruction: Studies in Contemporary Culture

[First paragraph]

For those engaged in any dimension of the vastly complex and highly contentious network of ideas, theories, and interdisciplinary projects under the rubric Cultural Studies, <> is a valuable, if not essential, journal. Since its inception some fourteen years ago, <> has maintained its mandate of intervention, creating a valuable and much needed space to publish politically charged and critically engaged work, often by unknown and marginalized scholars. Today these names read like a virtual who's who of the cultural studies world -- Homi Bhabha, Gayatri Spivak, Jurgen Habermas, Michael Taussig, Dipesh Chakrabarty to name but a few. This of …

Review Of Ladies Coupe, By Anita Nair, Haidar Eid

Reconstruction: Studies in Contemporary Culture

No abstract provided.

The Christian Reformed Church Periodical Index: A Local Solution To Indexing Periodicals, Greg Sennema

Library Publications

This article describes the creation of a web-based database that indexes less well-known periodical titles of importance to scholars in the Christian Reformed Church, and generally not covered by other indexing services. The author explains how the data from the index, originally stored in a card catalog, was moved online to a text-based system, and eventually into its present form in a web-based system. Highlighting some of the challenges that were overcome in creating this resource, brief details are provided on how the data is stored and retrieved in the web environment, on how the data are searched and presented …

Fatigue Behavior Of Beam Diaphragm Connections With Intermittent Fillet Welds: Part Ii, Brittle Fracture Examination Of The I-64 Blue River Bridge, Mark D. Bowman

JTRP Technical Reports

This report is the second of a two-part, three volume final report presenting the findings of the research work that was undertaken to evaluate the behavior of Indiana highway bridges with diaphragm members welded directly to the web of the primary beams and girders. Fatigue cracks have been observed at several bridges that utilize the welded diaphragm connection. The seriousness of the cracking and the corresponding potential risk on the integrity of the bridge superstructure were assessed. Inspection and repair guidelines for bridges with the welded diaphragm connections were also developed as part of the research effort. This volume presents …

Updating Procedures To Estimate And Forecast Vehicle-Miles Traveled, Jon D. Fricker, Raymond K. Kumapley

JTRP Technical Reports

Procedures developed for the estimation of Vehicle-Miles of Travel (VMT) have been fraught with problems of inaccuracy. Emphasis on environmental issues (air quality), as mandated by current regulations (CAAA, ISTEA-91, and TEA 21), requires State DOTs to accurately estimate travel on their highway infrastructure. The Federal Highway Administration (FHWA) has developed, and subsequently modified, the Highway Performance Monitoring System (HPMS) to assist in data collection and reporting. INDOT currently estimates VMT by a method that closely follows the HPMS method. Roads that are not on the state highway system (minor collectors, urban collectors and local) are not represented in the …

Wetlands Replacement Practices And Procedures For Indiana Highway Projects, James E. Alleman, Steve M. Graves

JTRP Technical Reports

It is estimated that Indiana has already lost more than 80% of its original, native wetlands, and concerns have been expressed that some fraction, and perhaps even a sizable fraction, of these losses can be historically linked to highway construction associated with INDOT-related activities. These wetlands are important for several reasons, in that they help keep ground water and surface water clean, serve as reservoirs for floodwaters, help recharge groundwater, provide habitats for many species of animals, and serve as recreational areas. This underlying concern behind this accusation, therefore, is that the construction of state and federal roads historically carried …

Third-Party Voting In Gubernatorial Elections: A Study Of Angus King Of Maine And Jesse Ventura Of Minnesota, Howard J. Gold

Government: Faculty Publications

This article analyzes the election of gubernatorial candidates Angus King of Maine (1994 and 1998) and Jesse Ventura of Minnesota (1998) in an attempt to determine the factors that produced these third-party victories. Previous studies point to a "culture of independence" explanation for third-party success. This approach focuses on attributes of the electorate, such as anti-partisan sentiment, previous support for a third-party candidate, economic discontent, issue concerns, and youth. Using VNS exit poll data and a multinomial logit model, I find that only two factors-anti-partisan sentiment and prior support for a third-party candidate-are powerful explanations for the success of both …

A Fanciful Look At Air Carrier Operations In The Year 2050, Cass D. Howell

Journal of Aviation/Aerospace Education & Research

Captain Lance Boyle smiled as he felt the smooth rippling thunk of the landing gear tires meeting the runway. Now that was how aircraft should land, not this vertical takeoff and landing nonsense employed by the newest "planes," still called that even though they didn't have wings at all. He eased forward on the side-stick controller slightly. The nose gear touched down and the strut compressed gently to give him a better view of the runway here at Los Angeles Air and Space Port. Captain Boyle continued the roll-out, pleased that his last landing in the "real world" had been …

Data Acquisition In Aviation Maintenance Training, Michael Leasure

Journal of Aviation/Aerospace Education & Research

In the following article, I would like to share some of my experiences with integrating data acquisition and virtual instrumentation (VI's) in my powerplant courses at Purdue University. The implementation of the equipment and procedures into the classes was a natural evolution of our educational environment. The more we discussed the inner dynamics of an engine, the more the students and I wanted to measure specific parameters and show their dues over time. This activity gave us a window of insight into the effects of changes that were introduced into the engines. Intentional modifications, as in a troubleshooting exercise, or …