Digital Commons Network^™

Expression And Action Of Transforming Growth Factor Beta (Tgfβ1, Tgfβ2, And Tgfβ3) During Embryonic Rat Testis Development, Andrea S. Cupp, Grace Kim, Michael K. Skinner

Department of Animal Science: Faculty Publications

The objective of the current study was to determine the role of transforming growth factor beta (TGFβ) during seminiferous cord formation and embryonic testis development. The expression pattern of mRNA for TGFβ isoforms was evaluated during testis development through a quantitative reverse transcription polymerase chain reaction (QRT-PCR) procedure. Expression of mRNA for TGFβ1 was highest at postnatal day 0 (P0) and P10. In contrast, TGFβ2 was high at embryonic day 15 (E15), declined at E16, and showed a transient increase at P0 through P3 of testis development. Interestingly, expression of mRNA for TGFβ3 was high during embryonic development and then …

Wpa News 59 (1999), World Pheasant Association

Galliformes Specialist Group and Affiliated Societies: Newsletters

WPA News (May 1999), number 59

Published by the World Pheasant Association

Fish & Wildlife News: May/June 1999

Fish and Wildlife News

Contents:

Director Lists Priorities 2
“Fulling the Promise” Debuts 2
LE Auctions Seized Items 3
Fishway Clears a Path for Shad 8
Reaching Out to Air Travelers 9
More Condors Fly Free in West 11
Realty In-Depth 13
Adventures in China 14
Training Refuge Officers 18
A Close Look at a Prescribed Burn 23
Rachel Carson at NCTC 26
A Look at Tropical Refuges 26
The Heritage Page: Service Archives Burgeoning 28
Fish and Wildlife...In Brief 31

Fish & Wildlife News: May/June 1999

Fish and Wildlife News

Contents:

Director Lists Priorities 2
“Fulling the Promise” Debuts 2
LE Auctions Seized Items 3
Fishway Clears a Path for Shad 8
Reaching Out to Air Travelers 9
More Condors Fly Free in West 11
Realty In-Depth 13
Adventures in China 14
Training Refuge Officers 18
A Close Look at a Prescribed Burn 23
Rachel Carson at NCTC 26
A Look at Tropical Refuges 26
The Heritage Page: Service Archives Burgeoning 28
Fish and Wildlife...In Brief 31

Integrated Management Systems For Australian White Ibis (Threskiornis Molucca) On The Gold Coast, Queensland, Australia, Phillip P. Shaw

Bird Strike Committee-USA/Canada Joint Annual Meeting: 1st (1999)

Fueled by a large supplemental food supply at landfills in South-east Queensland, Australian White Ibis (Threskiornis molucca) populations grew from an estimated 5000 to 10000 between 1995 and 1998. Ibis counted at Coolangatta Airport reflected this growth with a 556% increase between 1989 and 1995. The multimillion-dollar loss of a Qantas airbus engine from ingestion of an Ibis, resulted in the establishment of the Ibis Management Coordination Group (IMCG). This group, comprising government, industry and community representatives, instigated an integrated program of food reduction, restriction of breeding success and public education. The program has become an example for management programs …

Zero Bird-Strike Rate - An Achievable Target, Not A Pipedream, S. M. Satheesan

Bird Strike Committee-USA/Canada Joint Annual Meeting: 1st (1999)

This paper explains how zero bird-strike rate can be achieved by any aerodrome by constant efforts and perseverance of a dedicated team as evidenced from the author’s experience on about 30 aerodromes in India. This paper stresses the importance of conducting survey of problem aerodromes every five years by an expert (Satheesan 1996c), necessity for employing an Ornithologist at every aerodrome, need for regular national-level training for bird-controllers (Satheesan, in press - b) and urgency for setting up Bird-strike Prevention Committees at national (interministerial) and airport levels. Bird strike rates were brought down to zero at the Trivandrum International Airport …

Raising Public Awareness Of Bird Strike Risk Issues With An Enhanced Bird Strike Committee Usa Web Site, Todd Curtis

Bird Strike Committee-USA/Canada Joint Annual Meeting: 1st (1999)

Since 1997, a World Wide Web site managed by a member of Bird Strike Committee USA and a site managed by the Committee leadership were instrumental in supporting Committee efforts to reduce these hazards. Based on insights gained from these two Web sites, a new site was created that contained the most effective elements of the earlier sites and new elements designed to enhance the ability of the Committee to accomplish its mission. The new elements included the acquisition and use of the domain name birdstrike.org, the ability to electronically submit bird and other wildlife strike reports directly into the …

Pyoveridine Production By Pseudomonas Aeruginosa Exposed To Metals Or An Oxidative Stress Agent, Kim-Hien Thi Dao, Katherine E. Hamer, Christine L. Clark, Lawrence G. Harshman

School of Biological Sciences: Faculty Publications

Siderophores are low molecular mass compounds used by many microorganisms to scavenge dissolved iron, which is typically rare in environments. Pseudomonas aeruginosa (PAO1) was exposed to metals and methyl viologen in low-iron medium in order to monitor the abundance of a specific siderophore (pyoverdine) and monitor growth over time. In this study it was discovered that cadmium can stimulate pyoverdine abundance. Cadmium may interact with and sequester the Fur regulatory protein, which represses siderophore synthesis under conditions of iron sufficiency. Mercury did not stimulate pyoverdine production at concentrations that strongly inhibited bacterial growth, suggesting that pyoverdine production is not governed …

Center For Sustainable Agricultural Systems Newsletter, May/June 1999

Center for Sustainable Agricultural Systems: Newsletter (1993–2000)

Contents:

The Farmer and the Dean

University Role in Biotechnology: Who Owns Genes and Diversity?

CSAS Volume 9 Discusses Watersheds

SARE Appoints Paula Ford North Central PDP

Coordinator Policy Project Identifies Retention of Farms and Farmland as Top Priorities

Olson Heads to Kentucky

Organic Grain Farming Workshops

Two Alternative Agriculture Conferences in Midwest

Pyoverdine Production By Pseudomonas Aeruginosa Exposed To Metals Or An Oxidative Stress Agent, Kim-Hien Thi Dao, Katherine E. Hamer, Christine L. Clark, Lawrence G. Harshman

School of Biological Sciences: Faculty Publications

Siderophores are low molecular mass compounds used by many microorganisms to scavenge dissolved iron, which is typically rare in environments. Pseudomonas aeruginosa (PAO1) was exposed to metals and methyl viologen in low-iron medium in order to monitor the abundance of a specific siderophore (pyoverdine) and monitor growth over time. In this study it was discovered that cadmium can stimulate pyoverdine abundance. Cadmium may interact with and sequester the Fur regulatory protein, which represses siderophore synthesis under conditions of iron sufficiency. Mercury did not stimulate pyoverdine production at concentrations that strongly inhibited bacterial growth, suggesting that pyoverdine production is not governed …

Structural And Magnetic Properties Of Nanocomposite Co:C Films, M. Yu, Yi Liu, David J. Sellmyer

David Sellmyer Publications

The structural and magnetic properties of Co:C nanocomposite films at room temperature were investigated as functions of annealing temperature, Co concentration, and film thickness. The as-deposited films, which were cosputtered from Co and C onto water-cooled glass substrates, are nonmagnetic amorphous Co–C alloys. Hexagonal-close-packed (hcp) Co grains are formed in 100 nm films annealed at 300 °C and most Co takes this structure when annealed at higher temperatures. The sizes of the Co grains range from 10 to 25 nm, with larger grain size resulting from higher annealing temperature and higher Co concentration. With the increase of annealing temperature and …

Enhancement Of Coercivity In Nanometer-Size Copt Crystallites, Sy_Hwang Liou, S. Huang, Elizabeth S. Klimek, Roger D. Kirby

Roger Kirby Publications

In this study, we showed that a magnetic coercivity (H_c) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H₂ atmosphere at temperatures from 650 to 750 °C for 3–12 h, we measured the magnetic properties and found that magnetic H_c relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is …

Effects Of Layer Thickness On Orientation Distribution And Magnetic Properties Of Cocrta/Cr Films, Z. S. Shan, H. Zeng, C. X. Zhu, M. Azarisooreh, K. Honardoost, Yi Liu, David J. Sellmyer

David Sellmyer Publications

No abstract provided.

Activation Entropy, Activation Energy, And Magnetic Viscosity, Ralph Skomski, Roger D. Kirby, David J. Sellmyer

Roger Kirby Publications

Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers’ escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are …

Effects Of Layer Thickness On Orientation Distribution And Magnetic Properties Of Cocrta/Cr Films, Z.S. Shan, H. Zeng, C.X. Zhu, M. Azarisooreh, K. Honardoost

David Sellmyer Publications

Evolution of orientation distribution of Co(110) crystal planes was determined by x-ray rocking curves. It has been found that: (i) The full-width at half maximum W of the Co(110) rocking curve decreases with both increasing Cr underlayer thickness d_cr, and increasing CoCrTa magnetic layer thickness d_co, especially in the thin layer regime. (ii) For the thin d_coregime, the interlayer diffusion between the Cr underlayer and the magnetic layer affects the rocking curves and magnetic properties significantly. (iii) Film magnetic properties, e.g., a significant jump in coercivity with increasing magnetic layer thickness in the thin …

Research And Evaluation Priorities For Distance Education In Nebraska: A Delphi Study, S. Kay Rockwell

Nebraska Network 21: Publications

To provide a strong philosophical and policy basis for developing distance education opportunities, distance educators across Nebraska identified and ranked future research and evaluation needs/issues for distance education. In the area of planning, major interests focused on identifying ways to promote better cooperation among institutions so both technology utilization and distance education programming can be coordinated more effectively. As the coordination and cooperation for programming and technology use improve, it is important to identify the impact the improved strategy has on learners. In the area of structuring, major interests appear to concentrate on effective strategies for successful distance learning experiences; …

Adolescent Victims And Intergenerational Issues In Sexual Abuse, Debra B. Hecht, David J. Hansen

Department of Psychology: Faculty Publications

The transitional period of adolescence is characterized by a number of changes and challenges that occur both within and outside the individual. Many developmental events occur during adolescence that have a significant impact on an adolescent’s functioning, including a variety of physical, cognitive, emotional, behavioral, and social changes. In addition, adolescents may experience a variety of other important events, such as peer group changes, school moves, changes in family structure or functioning, and alterations in societal and community expectations (Hansen, Giacoletti, & Nangle, 1995; Peterson & Hamburg, 1986). Unfortunately, many adolescents are further challenged by being a victim of sexual …

Action Of Retinoids On Embryonic And Early Postnatal Testis Development, Andrea S. Cupp, Jannette M. Dufour, Grace Kim, Michael K. Skinner, Kwan Hee Kim

Department of Animal Science: Faculty Publications

The current study investigates the hypothesis that retinoids have a role in embryonic testis development. The action of retinoids on testis development and the expression of retinoic acid receptors (RARα, RARβ, RARγ) were examined. In embryonic day 13 (E13; plug date 5 E0) testis organ cultures an RAR-selective agonist and alltrans retinoic acid completely inhibited seminiferous cord formation. In contrast, an RARα-selective antagonist had no effect. RT-PCR demonstrated that RARα messenger RNA (mRNA) was expressed at all developmental time points evaluated, which included embryonic day 14 (E14) through postnatal day 30 (P30). Expression of RARβ mRNA was present at E15 …

Chronic Effects Of Atrazine On Tolerance Of A Benthic Diatom, Karen J. Nelson, Kyle D. Hoagland, Blair Siegfried

Department of Entomology: Faculty Publications

The effects of prior chronic exposure to atrazine on responses to subsequent acute exposures were investigated using a common benthic diatom. Clonal, axenic cultures of Craticula cuspidata were established from the Platte River (Nebraska) and obtained from a culture collection (unlikely prior exposure to atrazine). All cultures received a chronic 67-d treatment of 1 μg/L atrazine, and growth was monitored using fluorometric detection of chlorophyll a. Chronic atrazine exposure significantly reduced growth rate only during the first day of treatment (p= 0.0001); no significant effect was detected throughout the remainder of the 67-d period. Following the chronic treatment, …

Homeless And Working Street Youth In Latin America: A Developmental Review, Marcela Raffaelli

Department of Psychology: Faculty Publications

In most Latin American countries, a substantial proportion of children grow up in circumstances of extreme deprivation and early independence. These include "street youth", youngsters who work and sometimes live on city streets in developing countries. Most street youth research has been conducted from an applied perspective and emphasizes service and policy needs. Little developmental research has been conducted with street youth, and the long-term impact of street life is largely unknown. This review synthesizes empirical findings on the developmentally-relevant experiences of sub-groups of street youth in Latin America. It includes research in four areas: social networks, daily survival, health …

The Rate-Based Execution Model, Kevin Jeffay, Steve Goddard

School of Computing: Technical Reports

We present a new task model for the real-time execution of event-driven tasks in which no a priori characterization of the actual arrival rates of events is known; only the expected arrival rates of events is known. We call this new task model rate-based execution (RBE), and it is a generalization of the common sporadic task model. The RBE model is motivated naturally by distributed multimedia and digital signal processing applications.
We identify necessary and sufficient conditions for determining the feasibility of an RBE task set, and an optimal scheduling algorithm (based on preemptive earliest-deadline-first (EDF) scheduling) for scheduling the …

Journal Of Telecommunications In Higher Education

ACUTA Journal

In this Issue

6 The Synergy of Network Convergence and the IP Infrastructure

12 Leveraging the IP Network at the University of Oregon

18 How the Internet Will Change Network Management

26 Voice Over IP: The Stakes Get Higher

30 Abilene: An Advanced Research Network

34 Web-Based Systems on the 21st-Century Campus

46 Bill D. Morris Award: Whitney Johnson

Cc400 University Of Nebraska Cooperative Extension : Committed To Excellence

University of Nebraska-Lincoln Extension: Historical Materials

Campaign Circular 400: This is about the University of Nebraska helping Nebraskans visualize the commitment to excellence in cooperative Extension.

Microbiology Of The Oil Fly, Helaeomyia Petrolei, Dana R. Kadavy, Bradley A. Plantz, Christopher A. Shaw, Jill Myatt, Tyler A. Kokjohn, Kenneth Nickerson

Papers in Microbiology

Helaeomyia petrolei larvae isolated from the asphalt seeps of Rancho La Brea in Los Angeles, Calif., were examined for microbial gut contents. Standard counts on Luria-Bertani, MacConkey, and blood agar plates indicated ca. 2 x 10⁵ heterotrophic bacteria per larva. The culturable bacteria represented 15 to 20% of the total population as determined by acridine orange staining. The gut itself contained large amounts of the oil, had no observable ceca, and maintained a slightly acidic pH of 6.3 to 6.5. Despite the ingestion of large amounts of potentially toxic asphalt by the larvae, their guts sustained the growth of …

Review Of Western Visions: Perspectives On The West In Canada By Roger Gibbons And Sonia Arrison, Michael D. Behiels

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

In the 1997 Canadian election, Preston Manning's Reform Party emerged as Her Majesty's Loyal Opposition with 60 seats in the House of Commons. The Liberal Governing Party of Prime Minister Jean Chretien would have been reduced to a minority had Liberals not won 101 of Ontario's 103 seats. Why and how did this development occur? What are some of its probable consequences? Western Visions provides a timely and revealing set of answers to these questions so closely related to Canada's perennial national unity crisis. Most academics and interested citizens think about that crisis primarily, if not exclusively, in terms of …

Review Of The Brandon Teena Story Produced And Directed By Susan Muska And Greta Olafsdottir, June Perry Levine

Great Plains Quarterly (through 2013)

CRIME AND RESPONSIBILITY

The Brandon Teena Story, Susan Muska and Greta Olafsdottir's recently released documentary, addresses the circumstances of a triple murder that occurred on the last day of December 1993 in a rural farmhouse in southeastern Nebraska. The crime received national media coverage because one of its victims, the principal target of the attack, was a young woman who had, for some time, been living as a man. The two other victims, a young man and woman, were killed because they were witnesses. The murderers were quickly apprehended and tried, one sentenced to life in prison, the other …

Factors In Rural Community Survival: Review Of Insights From Thriving Small Towns, Milan Wall

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

During the 1980s crisis in the agricultural economy, some observers claimed that many towns were too small, too isolated, or too distant from larger population centers to survive in times of economic turmoil. We decided to evaluate these assumptions through a series of in-depth case studies of thriving small communities in the Great Plains. The communities we studied fit the general description of towns that were doing better than expected. Using an anthropological approach, the teams of field researchers from the Heartland Center for Leadership Development visited communities, ranging in size from 300 to 6,000, in Colorado, the Dakotas, Kansas, …

Review Of Ghost Dancing The Law: The Wounded Knee Trials By John William Sayer, Leonard R. Bruguier

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

Word Wars: American Indian Movement agenda versus the United States’ judicial system. In a smoothly written analysis of the 1974 trial of Russell Means and Dennis Banks for "criminal acts" committed during the 1973 occupation of Wounded Knee, John Sayer provides an evocative chronology of events and ideals that influenced the St. Paul trial. Woven throughout the narrative are parallel examples of historic revolutionary movements and leaders, a device allowing readers to compare and contrast the possibilities and pitfalls inherent in ideological revolutions. Set in the turbulence of Watergate and media hysteria, the Wounded Knee trials lead Sayer to ask …

The Probe, Issue 199 – April 1999

The Probe: Newsletter of the National Animal Damage Control Association

American White Pelicans: The latest avian problem for southeastern catfish producers -- D. Tommy King, USDAIAPHISIWS, National Wildlife Research Center, Mississippi Research Station, Mississippi State University, MS 39762
In Memoriam: William D. Fitzwater (1917-1999)
In Memoriam: Jack H. Berryman
Booklet Review: "Managing Canada Geese in Urban Environments: A Technical Guide" by Arthur E. Smith, Scott R. Craven and Paul D. Curtis (1999). Jack Berryman Institute Publication 16, and Cornell University Cooperative Extension, Ithaca, NY. 42 pages. $10.00 (postpaid)
Video Review: "Suburban Goose Management: Searching for Balance." Produced by the Educational Television Center Media and Technology Services, Cornell University. (1998) VHS. …

Review Of The Diefenbaker Legacy: Canadian Politics, Law And Society Since 1957 Edited By D.C. Story And R. Bruce Shepard, William Neville

Great Plains Research: A Journal of Natural and Social Sciences (through 2013)

John Diefenbaker, Canada's Prime Minister from 1957 to 1963, remarked during his last campaigns as Conservative Party leader, "Everybody is against me but the people." The comment, though a quintessential expression of his populism (lightly laced with a touch of paranoia), was not altogether inaccurate. Even after his defeat, Diefenbaker enjoyed folk-hero status with many of those he called "average Canadians," but continued, largely, to be dismissed as an incompetent failure by the country's political, academic, and journalistic elites. Denis Smith's 1995 biography, Rogue Tory, was the first balanced, albeit critical, examination of Diefenbaker's career. This new collection of …