Digital Commons Network^™

Expression And Action Of Neurotropin-3 And Nerve Growth Factor In Embryonic And Early Postnatal Rat Testis Development, Andrea S. Cupp, Grace H. Kim, Michael K. Skinner

Department of Animal Science: Faculty Publications

The current study examines the expression and potential actions of neurotropin-3 (NT3), nerve growth factor (NGF), and their receptors during morphological sex determination (seminiferous cord formation) and perinatal rat testis development. The expression of neurotropins and their receptors was analyzed with immunohistochemistry. Cellular localization of neurotropin ligand and receptor proteins changed during embryonic testis development. Neurotropin-3 was localized to Sertoli cells at Embryonic Day 14 (E14), was present in gonocytes at Postnatal Day 0 (P0), and after birth became localized to the interstitium and Sertoli cells (P3–P5). The expression of trk C (the high affinity receptor for NT3) was localized …

Chemical And Biological Trends During Lake Evolution In Recently Deglaciated Terrain, Daniel R. Engstrom, Sherilyn C. Fritz, James E. Almendinger, Stephen Juggins

Department of Earth and Atmospheric Sciences: Faculty Publications

As newly formed landscapes evolve, physical and biological changes occur that are collectively known as primary succession. Although succession is a fundamental concept in ecology, it is poorly understood in the context of aquatic environments. The prevailing view is that lakes become more enriched in nutrients as they age, leading to increased biological production. Here we report the opposite pattern of lake development, observed from the water chemistry of lakes that formed at various times within the past 10,000 years during glacial retreat at Glacier Bay, Alaska. The lakes have grown more dilute and acidic with time, accumulated dissolved organic …

Value-Added And The Declining Farm Share Of Consumer Expenditures For Food, Jeffrey S. Royer

Cornhusker Economics

The farm share of consumer expenditures for food has fallen substantially over the past five decades. As shown in Figure 1, consumer expenditures for domestically produced farm foods increased from $50.9 billion in 1952 to $618.4 billion in 1999. The farm value of these foods increased from $20.4 billion to $120.5 billion during the same period, representing a decline in the farm share from 40 percent to 20 percent.

Cytoplasmic Filament-Deficient Mutant Of Treponema Denticola Has Pleiotropic Defects, Jacques Izard, William A. Samsonoff, Ronald J. Limberger

Department of Food Science and Technology: Faculty Publications

In Treponema denticola, a ribbon-like structure of cytoplasmic filaments spans the cytoplasm at all stages of the cell division process. Insertional inactivation was used as a first step to determine the function of the cytoplasmic filaments. A suicide plasmid was constructed that contained part of cfpA and a nonpolar erythromycin resistance cassette (ermF and ermAM) inserted near the beginning of the gene. The plasmid was electroporated into T. denticola, and double-crossover recombinants which had the chromosomal copy of cfpA insertionally inactivated were selected. Immunoblotting and electron microscopy confirmed the lack of cytoplasmic filaments. The mutant was further …

The Use Of Live-Bait Traps For The Study Of Sylvatic Rhodnius Populations (Hemiptera: Reduviidae) In Palm Trees, F. Abad-Franch, F. Noireau, A. Paucar C., H. M. Aguilar V., C. Carpio C., J. Racines V.

University of Nebraska State Museum: Entomology Papers

Chagas disease is a major public health challenge for most Latin American countries. An initiative for the coordinated control of Chagas disease transmission throughout the Andean countries was launched in 1997. Since the early 1990s, control measures based on elimination of domestic/peridomestic triatomine colonies and screening of donor blood by serological testing have resulted in a reduction in incidence of ~70% in the Southern Cone countries (WHO, 1991; Dias & Schofield, 1999; Moncayo, 1999; WHO/CTD, 2000).

Natural Antibiotic Resistance Of Bacteria Isolated From Larvae Of The Oil Fly, Helaeomyia Petrolei, Dana R. Kadavy, Jacob M. Hornby, Terry Haverkost, Kenneth W. Nickerson

Papers in Microbiology

Helaeomyia petrolei (oil fly) larvae inhabit the asphalt seeps of Rancho La Brea in Los Angeles, Calif. The culturable microbial gut contents of larvae collected from the viscous oil were recently examined, and the majority (9 of 14) of the strains were identified as Providencia spp. Subsequently, 12 of the bacterial strains isolated were tested for their resistance or sensitivity to 23 commonly used antibiotics. All nine strains classified as Providencia rettgeri exhibited dramatic resistance to tetracycline, vancomycin, bacitracin, erythromycin, novobiocin, polymyxin, colistin, and nitrofurantoin. Eight of nine Providencia strains showed resistance to spectinomycin, six of nine showed resistance to …

The International Lepidoptera Survey Newsletter, November 2000, International Lepidoptera Survey, Ron Gatrelle

International Lepidoptera Survey Newsletter

Contents

Chlosyne ismeria ismeria by Ron Gatrelle (page 1)

Announcement: TC-ISBN Taxonomically Correct - Index of Scientific Butterfly Names

The Taxonomic Report update

Donations urgently needed for the International Lepidoptera Survey

2001 subscription rate lowered For TTR volume 3

Fish & Wildlife News: November/December 2000

Fish and Wildlife News

Contents:

Jones Named Deputy Director 2
New Guidelines Announced for Federal Aid 3
Landmark Legislation for Refuge System 4
Maine Salmon Given ESA Protection 7
Service a Presence in Fisheries Society 11
Information Portal Makes Life Easy 13
Region 5 Invests in People 15
New Refuge Dedicated in Montana 16
U.S. and Russia Sign Polar Bear Treaty 18
Fighting the War on Weeds 22
Mexican Students Flock to Alaska 28
Fish and Wildlife...In Brief 35

Wpa News 63 (2000), World Pheasant Association

Galliformes Specialist Group and Affiliated Societies: Newsletters

WPA News (November 2000), number 63

Published by the World Pheasant Association

Obituary: Elmer Clea Birney, 1940-2000, Hugh H. Genoways, Carleton J. Phillips, Jerry R. Choate, Robert S. Sikes, Kristin M. Kramer

University of Nebraska State Museum: Mammalogy Papers

On 11 June 2000, Dr. Elmer C. Birney unexpectedly passed away from cardiac arrest suffered while outside caring for his cattle at his home in Blaine, Minnesota. One of his former students, Robert Timm, probably best expressed the immediate reaction of his family and many friends: ‘‘He was too young and in too good of health to be gone so soon.’’ At the time of his death, Elmer was Professor in the Department of Ecology, Evolution and Behavior, the Curator of Mammals at the Bell Museum of Natural History, and Director of Graduate Studies of the program in Ecology, Evolution …

Runoff And Soil Loss As Affected By The Application Of Manure, John E. Gilley, L. Mark Risse

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Manure has been used effectively to improve crop production and soil properties because it contains nutrients and organic matter. While it is generally accepted that the improved soil properties associated with manure application lead to changes in runoff and soil erosion, few studies have quantified these impacts. Water quality models used to assess watershed management and estimate total maximum daily load must accurately predict loading rates from fields where manure has been applied. This study was conducted to assemble and summarize information quantifying the effects of manure application on runoff and soil loss resulting from natural precipitation events, and to …

Electrophysiological Studies Of Olfaction In The Whip Spider Phrynus Parvulus (Arachnida, Amblypygi), Eileen Hebets, Reginald F. Chapman

Eileen Hebets Publications

The olfactory response of the whip spider Phrynus parvulus from Costa Rica was examined using a technique analogous to that used for insect electroantennograms on the tarsi of the antenniform legs which bear multiporous sensilla. Responses to 42 chemicals representing different chain lengths of alkanes, carboxylic acids, alcohols, aldehydes, and ketones, as well as some esters, monoterpenes, and phenolics were examined. Fifty-four percent of the chemicals tested elicited responses. Concentration–response curves were generated for guaiacol, hexanal, methyl salicylate, benzaldehyde, octanoic acid, and linalool. Guaiacol, benzaldehyde, and hexanol elicited the greatest responses and no differences were detected between the sexes. Compounds …

Control Of High-Harmonic Generation And Laser-Assisted X-Ray-Atom Scattering With Static Electric And Magnetic Fields, D. B. Milošević, Anthony F. Starace

Anthony F. Starace Publications

We consider the use of strong static fields to control two related atomic processes: laser-assisted x-ray-atom scattering (XAS) and high-harmonic generation (HHG). We first analyze the laser field intensity dependence of the differential cross section (DCS) plateau structures for the laser-assisted XAS process in the presence of a static electric field as a function of the number of photons exchanged with the laser field. Besides the recently discovered (Milošević, D.B. and Starace, A.F., 1998, Phys. Rev. Lett., 81, 5097) extended plateau for absorbed photons, which indicates a substantial increase of the scattered x-ray energies, a new plateau, having many …

Amino Acid Osmolytes In Regulatory Volume Decrease And Isovolumetric Regulation In Brain Cells: Contribution And Mechanisms, Herminia Pasantes-Morales, Rodrigo Franco, M. Eugenia Torres-Marquez, Karla Hernandez-Fonseca, Arturo Ortega

School of Veterinary and Biomedical Sciences: Faculty Publications

Brain adaptation to hyposmolarity is accomplished by loss of both electrolytes and organic osmolytes, including amino acids, polyalcohols and methylamines. In brain in vivo, the organic osmolytes account for about 35% of the total solute loss. This review focus on the role of amino acids in cell volume regulation, in conditions of sudden hyposmosis, when cells respond by active regulatory volume decrease (RVD) or after gradual exposure to hyposmotic solutions, a condition where cell volume remains unchanged, named isovolumetric regulation (IVR). The amino acid efflux pathway during RVD is passive and is similar in many respects to the volume-activated anion …

"College Of Behavioral And Social Sciences' Recruitment Strategy: A New Paradigm - A Move From Recruitment To Selection", Robin A. Veidman B.S., Robert E. Steele Ph.D.

Different Perspectives on Majority Rules: 5th Annual National Conference (2000)

"Through collaborative efforts between undergraduate Partner institutions and the University of Maryland in programs such as the Summer Research Initiative, we have seen positive recruitment outcomes."

"The Contact Hypothesis: White Students And Black Professors", Donnetrice C. Barbee

Different Perspectives on Majority Rules: 5th Annual National Conference (2000)

"This analysis examines Allport's (1954) contact hypothesis as it relates to white students' perceptions of black professors teaching at predominantly white colleges and universities."

“The Transformation Process Mandates Self-Negation: The Making Of Dysfunctional White People With Black Or Colored Skin”, William B. Stewart, Ida B. Stewart

Different Perspectives on Majority Rules: 5th Annual National Conference (2000)

"Our study will show how the pyramidal structure as a permanent feature of every aspect of American society continues to function in the same manner at institutions of higher learning"

“2+2+2” Collaboration Adds Up To Success For American Indian Students", Timothy J. Nichols, Laurie Stenberg Nichols, Diane Kayongo-Male

Different Perspectives on Majority Rules: 5th Annual National Conference (2000)

"Various governmental, political and community leaders have called for a model which fosters collabo¬ration between high schools, tribal colleges and state universities which will help Native students over¬come barriers and complete their higher education. South Dakota's 2+2+2 program provides such a model."

"Breaking Through The Soft Spoken Stereotype: The Voices Of Asian Women In Doctoral Programs", Vivian Ota Wang Ph.D., Christine C. Iijima Hall Ph.D., Debbiesiu Lee Ed.M., Kayoko Yokoyama, Juily Jung Chuang Liang, Karen Toa M.A., Ed.M.

Different Perspectives on Majority Rules: 5th Annual National Conference (2000)

This panel session explores how the dynamics of race and gender within university settings influence Asian women’s experiences in graduate psychology programs.

A New Species Of Eimeria (Apicomplexa, Eimeriidae) From The Weedy Sea Dragon Phyllopteryx Taeniolatus (Osteichthyes: Syngnathidae), Steve J. Upton, M. Andrew Stamper, Andrea L. Osborn, Sonia L. Mumford, Laura Zwick, Michael J. Kinsel, Robin M. Overstreet

Harold W. Manter Laboratory of Parasitology: Faculty Publications

A new species of intestinal coccidian is described from the weedy or common sea dragon Phyllopteryx taeniolatus housed at the New England Aquarium in Boston and at the Shedd Aquarium in Chicago, USA. Live oocysts of Eimeria phyllopterycis sp. n. are spherical, 30.9 (28.0-34.4) μm, with a thin, single-layered wall. Both a micropyle and oocyst residuum are absent and a large polar granule is sometimes present. Sporocysts are ellipsoidal and elongate, 24.3 × 10.4 (23.4-25.6 × 9.2-11.2) μm, with Stieda and substieda bodies; shape index (length/width) 2.33 (2.14-2.70). A sporocyst residuum is present, consisting of numerous granules of various sizes. …

Method And Apparatus For Adaptive Filtering By Counting Acoustic Sample Zeroes In Ultrasound Imaging, Gregory R. Bashford, Edward D. Nonnweiler, David D. Becker, David John Muzilla

Biomedical Imaging and Biosignal Analysis Laboratory

An ultrasound imaging system having an adaptive spatial filter the filter coefficients of which, for particular image parameter sample, are determined by counting the number of neighboring image parameter samples having zero or near-zero values. If the number of zero or near-zero values in a data window is greater than a predetermined threshold, the data in the window is passed, not filtered. This filter has two advantages over other spatial filters. First, image parameter data samples having only zero or near-zero neighboring values (i.e., isolated "point noise") are not smeared. Second, boundaries such as the edge of color in a …

Structural And Functional Conservation At The Boundaries Of The Chicken Β-Globin Domain, Noriko Saitoh, Adam C. Bell, Felix Recillas-Targa, Adam G. West, Melanie A. Simpson, Michael Pikaart, Gary Felsenfeld

Department of Biochemistry: Faculty Publications

We show that the 3' boundary of the chicken β -globin locus bears striking structural similarities to the 5' boundary. In erythroid cells a clear transition in DNase I sensitivity of chromatin at the 3' end of the locus is observed, the location of this transition is marked by a constitutive DNase I hypersensitive site (HS), and DNA spanning this site has the enhancer-blocking capacity of an insulator. This HS contains a binding site for the transcription factor CTCF. As in the case of the 5' insulator, the CTCF site is both necessary and sufficient for the enhancer-blocking activity of …

Clinical, Pathological And Antigenic Aspects Of Bovine Viral Diarrhea Virus (Bvdv) Type 2 Isolates Identified In Brazil, E. F. Flores, L. H. G. V. Gil, S. A. Botton, R. Weiblen, J. F. Ridpath, L. C. Kreutz, C. Pilati, D. Driemeyer, V. Moojen, A. C. Wendelstein

School of Veterinary and Biomedical Sciences: Faculty Publications

Nucleotide sequencing and phylogenetic analysis of Brazilian bovine viral diarrhea virus (BVDV) field isolates identified four viruses belonging to the genotype 2. Comparison of 5’ UTR sequences from these isolates to those of North American BVDV type 2 revealed genomic variations that correlated with the geographic origins of the isolates. Two of the Brazilian type 2 viruses were isolated from clinical cases of gastroenteric/respiratory disease and two were isolated from healthy bovine fetuses. The clinical cases affected young animals (8- and 18-months-old) and were characterized by diarrhea, respiratory signs, extensive oral and digestive tract erosions, conjunctival and vulvar congestion, occasional …

Seven Years Of White-Tailed Deer Immunocontraceptive Research At Penn State University: A Comparison Of Two Vaccines , Lowell A. Miller, Gary J. Killian

Wildlife Damage Management Conference Proceedings

PZP and GnRH immunocontraceptive vaccines were each tested in white-tailed deer (Odocoileus virginianus). Vaccination with PZP produced reversible infertility lasting 1 to 4 years. The first two years of active immunization resulted in an 89% reduction in fawning. Reduction in fawning for the 7-year study containing 4 years of no boosting was 72%. PZP immunization resulted in multi-estrus behavior, with contracepted deer returning to estrus up to 7 times. A five year study of GnRH immunization was conducted in both male and female deer. Treatment of does led to reduced fawning rates, reduced estrus behavior and reduced concentrations of progesterone. …

Aversive And Disruptive Stimulus Applications For Managing Predation, John A. Shivik, Daniel J. Martin

Wildlife Damage Management Conference Proceedings

The range expansion and reintroduction of mammalian predators (e.g., wolves, coyotes and bears) coupled with growing disfavor for traditional tools of wildlife management creates an immediate need for alternative, non-lethal, but effective techniques for managing predation on livestock. Scientists at the National Wildlife Research Center are using advanced technology and animal behavior concepts (e.g., aversive and disruptive stimuli) to develop new tools for the prevention of damage by large mammalian predators, and this paper is a review of our pilot studies investigating these techniques. Recently tested tools include behavior contingent disruptive stimulus devices for wolves and coyotes. Experiments indicate the …

A Private Lands Approach To Controlling New Jersey's Deer Population, David Drake

Wildlife Damage Management Conference Proceedings

In New Jersey, annual losses from white-tailed deer (Odocoileus virginianus) depredation to agricultural crops have been estimated as high as $10 million. Additional problems caused by the state's overabundance of deer include increasing vehicle/deer collisions, possible human health concerns regarding increasing incidences of Lyme disease, and a loss of flora and fauna diversity. In an effort to reduce deer numbers and minimize damage, both non-lethal and lethal management practices have been used with limited success. Hunter access to private lands remains the biggest impediment to effective deer management in New Jersey. I propose an incentive-based program to increase lease and …

Efforts To Enhance Stakeholder Communications In North Carolina's Wildlife Damage Control Agent System, Peter T. Bromley, Carl W. Betsill

Wildlife Damage Management Conference Proceedings

In 1995, North Carolina Wildlife Resources Commission (NCWRC) established policy and rules for handling of nuisance wildlife by Wildlife Damage Control Agents (WDCA). The policy required a one-day long training session, culminating in an open book, certification examination. The North Carolina Cooperative Extension Service (NCCES) conducted the training and administered the examination. The certification-training program covered principles of wildlife damage management, wildlife laws and regulations, humane handling of animals and euthanasia, human health risks from exposure to wildlife, professional ethics, and sources of technical information. Between Octoberl995 and March 2000,7 certification-training sessions were held and 289 WDCA's were certified, with …

Suburban Goose Management: Insights From New York State, Bryan L. Swift

Wildlife Damage Management Conference Proceedings

New York State Department of Environmental Conservation (DEC) conducted studies in suburban Rockland County, New York during 1993-2000 to help local officials develop strategies to alleviate conflicts associated with local-nesting or "resident" Canada geese {Branta canadensis). Annual counts indicated a relatively stable population of approximately 2,500-3,000 resident geese in the county, far fewer than anecdotal reports suggested. Counts tended to increase in towns where there was little or no goose management, whereas numbers declined in towns with active goose management efforts (i.e., egg-addling, capture and removal, or use of border collies). Egg-addling programs did not result in immediate reduction of …

Evaluations Of Nicarbazin-Treated Pellets For Reducing The Laying And Viability Of Canada Goose Eggs, Kurt C. Vercauteren, Michael J. Pipas, Kenneth L. Tope

Wildlife Damage Management Conference Proceedings

The number of Canada geese (Branta canadensis) nesting in the United States is increasing rapidly, generating more complaints and problems associated with them. Overabundant geese can be a nuisance, threaten human health and safety, and cause damage to property. Nicarbazin (NCZ), a coccidiostat used in chicken production, has been documented to reduce egg production and viability. The reduction of reproduction through the use of NCZ could be a valuable aspect of an overall integrated goose management plan. We conducted studies at 5 sites in Nebraska in spring 2000 to evaluate the efficacy of NCZ-treated pellets for reducing the laying and …

Effects Of Intense Deer Herbivory On The Herbaceous Understory At Trillium Trail, Tiffany Knight, Susan Kalisz, Lisa Smith, Joann Davis

Wildlife Damage Management Conference Proceedings

Due to a synergism of many human-mediated factors, white-tailed deer (Odocoileus virginianus) populations have increased dramatically throughout many forests throughout the northeastern North America over the last 50 years. The increase in deer populations negatively impacts plants through a variety of mechanisms, which can include increased consumption, trampling, and soil compaction. To preserve the plants in our forests, managers need to understand both how increases in the deer population impact the overall plant community as well as the individual plant species within the community. In general, the impact of deer presence on the overall plant community has been studied by …