Digital Commons Network^™

Foxtail Barley (Hordeum Jubatum) Control With Propoxycarbazone-Sodium And Fluazifop-P-Butyl In Three Alaska Native Grass Species, Brian Earl Jackson

Plant, Animal and Soil Sciences

Foxtail barley is one of the most detrimental weeds for the Alaska native grass seed industry. Its control is essential for improving seed production and stand longevity so producers can meet statewide seed demands. The objective of this study was to determine suitable chemical controls of foxtail barley for three different native grass species: 'Nortran' tufted hairgrass (Deschampsia caespitosa L.), 'Gruening' alpine bluegrass (Poa alpina L.), and 'Wainwright' slender wheatgrass (Elymus trachycalus L.) formerly (Agropyron pauciflorum L.). Field and greenhouse experiments were performed to identify selectivity between two herbicide compounds and the crops studied. Foxtail barley was extremely sensitive to …

Adrenal Responsiveness Of Black-Legged Kittiwake Chicks (Rissa Tridactyla): Interannual Variation And The Effects Of Nestling Status, Brood Size And Investigator Disturbance, John H. Brewer

Marine Biology

The adrenal response to stress in birds is characterized by the release of the hormone corticosterone. Measurement of corticosterone of individuals is increasingly being promoted as a means to gauge the effects of environmental change or human disturbance on populations. However, species respond differently to stressors based upon their natural history, individual life history stage and the context of the stressor; thus, the collection of baseline data from individuals in their natural environment has been advocated. We measured baseline and stress-induced corticosterone levels of 12-15 day-old black-legged kittiwake (BLKI) chicks from 2002-2005 in Chiniak Bay, Alaska. The goals of the …

Zooplankton Abundance, Community Structure, And Oceanography Northeast Of Kodiak Island, Alaska, Xian Wang

Marine Biology

Zooplankton community dynamics and correlations with physical characteristics of the water were studied in the northwestern Gulf of Alaska. Zooplankton were collected systematically northeast of Kodiak Island, Alaska in March, May, August and November of 2002 to 2004. Species composition, total abundance and spatial community structure were correlated to physical variables. Small copepods (numerically>50%) dominated the zooplankton composition and were most abundant in August. Average biomass was 48.7 g WW m⁻² in May and 52.0 g WW m⁻² in August in Kodiak region. Interannual zooplankton abundance variations were large, with May 2003 having a dramatically higher abundance (2x10⁴ individual …

The Ecology Of Vertebrate Pests And Integrated Pest Management (Ipm), Gary W. Witmer

United States Department of Agriculture Wildlife Services: Staff Publications

Across the world, vertebrates cause considerable annual damage to agriculture, property, human health and safety, and natural resources. Although some species of all vertebrate groups have been implicated in damage, the species most often involved in serious amounts of damage are birds and mammals. Agroecosystems have provided many new opportunities for vertebrates to exploit, resulting in their becoming serious "pests" with humans taking various steps to protect their agricultural resources. This conflict has intensified as the human population has increased, efforts to get more production out of traditional croplands have intensified, and marginal lands have been placed into crop production. …

The Inkwell, Armstrong Atlantic State University

The Inkwell

No abstract provided.

The Bg News August 17, 2007, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. August 17, 2007. Volume 98-Issue 1.

Habitat Selection And Sightability Of Moose In Southeast Alaska, Susan A. Oehlers

Biological Sciences

We examined the role of scale and sex in habitat selection by radiocollared Alaskan moose (Alces alces gigas) on the Yakutat forelands, Alaska, USA. We used conditional logistic regression to quantify differences in habitats selected between sexes and seasons at 3 different spatial scales (250, 500, and 1000 m), and multi-response permutation procedure (MRPP) to test for differences in spatial distribution between the sexes. Sexes selected for habitats similarly during the mating season, when sexes generally were aggregated, whereas sexes exhibited differential habitat selection during the non-mating season when sexes were segregated. Both sexes selected habitats at the 1000 m …

Regional Climate, Federal Land Management, And The Social-Ecological Resilience Of Southeastern Alaska, Colin Mitchell Beier

Biological Sciences

Complex systems of humans and nature often experience rapid and unpredictable change that results in undesirable outcomes for both ecosystems and society. In circumpolar regions, where multiple converging drivers of change are reshaping both human and natural communities, there is uncertainty about future dynamics and the capacity to sustain the important interactions of social-ecological systems in the face of rapid change. This research addresses this uncertainty in the region of Southeast Alaska, where lessons learned from other circumpolar regions may not be applicable because of unique social and ecological conditions. Southeast Alaska contains the most productive and diverse ecosystems at …

Headwater Stream Invertebrate Communities: A Comparison Across Ecoregions And Logging Histories, R. Bruce Medhurst

Biological Sciences

Monitoring stream condition is not always conducted with understanding how climate may influence anthropogenic disturbances. Stream monitoring has traditionally been accomplished through sampling benthic invertebrates, while sampling drifting invertebrates as a potential monitoring tool has received little attention, in spite of drift often being easier and less expensive to sample. The objectives of this study were to understand how logging influences headwater stream invertebrate communities (benthic and drift) across two ecoregions in the Cascade Range, central Washington, and to determine whether drift samples might serve as a replacement for benthic samples in assessing headwater stream condition. Benthic and drifting invertebrates …

Population Dynamics Of Tundra Swans On The Lower Alaska Peninsula, Brandt W. Meixell

Biological Sciences

This study was initiated in response to concerns regarding apparent declines in abundance and breeding pair density of tundra swans on and adjacent to Izembek National Wildlife Refuge (NWR) on the lower Alaska Peninsula. I conducted an analysis of long-term data (1978-1996) to estimate demographic parameters and assess the relationship between survival probabilities and a number of environmental and ecological factors. Rates of productivity (egg, nest, cygnet survival) and annual rates of apparent adult survival were lower and more variable than previously observed for other swan populations and species. A negative relationship between nesting success and brown bear density indicates …

Mouse Circadian Plasma Leptin And Active Ghrelin Rhythms Under Ad Libitum And Scheduled Feeding, Haiting Wan

Biological Sciences

Light is the strongest timing cue for the circadian system, but non-photic cues can also entrain the master circadian clock, i.e., suprachiasmatic nuclei (SCN). In one of our mouse line (ENTR), all mice entrain to scheduled feeding, while in another (NON-ENTR) only 4 % entrain. In order to explore key physiological pathways involved in that process, I quantified the circadian rhythms of plasma leptin and active ghrelin of these two lines of mice under a 12:12 hour light-dark cycle with ad libitum feeding and six hours of food availability during the light period. Plasma active ghrelin induced opposite circadian rhythms …

Breeding Ecology And Fasting Tolerance Of Scaup And Other Ducks In The Boreal Forest Of Alaska, Kate H. Martin

Biological Sciences

Information on the breeding ecology of boreal forest ducks is lacking, despite management concern for species such as the lesser scaup (Aythya affinis), whose population has declined markedly since the 1980s. The mechanisms impacting population growth of scaup, and which component of their population dynamics is most affected, are unknown. Previous investigators hypothesized that food deprivation in the spring may reduce breeding success. My objectives were to: 1) examine reproductive parameters of lesser scaup and other ducks on the Yukon Flats in interior Alaska, and 2) measure the tolerance of captive scaup to fasting, in comparison to sympatric Northern shovelers …

Um Hires First Craighead Chair In Wildlife Biology, University Of Montana--Missoula. Office Of University Relations

University of Montana News Releases, 1928, 1956-present

No abstract provided.

20070817: Graduate College, Faculty Research Files, 1986-1991, Graduate College

Guides to University Archives

These items include materials from the office of the Graduate College at Marshall University from 1986-1991. Items were received in 2007 and include notable materials from or about the Summer Faculty Research Awards from 1987-1988, other faculty research awards, thesis research awards, and other general faculty awards listees. This is not an exhaustive list. Please download the finding aid for a full list of contents.

Understanding And Optimizing Surfaces And Interfaces In Energy Conversion Devices, Clemens Heske

UNLV Renewable Energy Symposium

This inaugural event is dedicated to showcasing the renewable/sustainable energy projects of UNLV faculty, staff, students, and collaborators, as well as other external projects underway statewide and nationally. The development and utilization of new technologies to protect the environment, achieve energy independence, and strengthen the economy will be explored. Speakers and poster-session presenters will provide further insight to many ongoing projects and innovative research ideas.

Organized by UNLV’s Office of Strategic Energy Programs, the event offers participants the opportunity to learn about energy projects and will encourage networking and collaboration. This symposium is intended for researchers, educators, students, policy makers, …

Model-Based Anomaly Management For Small Spacecraft Missions, Christopher Kitts, Richard Rasay

Small Satellite Conference

Space missions produce value through the production of mission data products and services. In doing so, however, significant resources are expended in order to maintain system health and to manage anomalies as they occur. These tasks are costly in terms of the expertise, personnel, and time required to detect, diagnose and resolve problems. Our recent work in model-based reasoning (MBR) techniques has demonstrated the applicability of this technology to the small satellite domain. MBR uses fundamental design knowledge of a system in order to compute reasoning conjectures relating to the existence of symptoms, diagnosis estimates, and resolution control actions. In …

Creativity - Resources, Tracy Bicknell-Holmes

University of Nebraska-Lincoln Libraries: Presentations

No abstract provided.

Chanticleer | Orientation 2007, Jacksonville State University

Chanticleer

No abstract provided.

Manifestations Of Nature, Bethany Krull

Theses

I feel that humans in today’s society are distanced so much from their origins that we need to be reminded that our roots are deeply and firmly planted in the natural world. I feel that it is our society’s current disconnection and alienation from nature that is a key reason we have let the destruction of the environment go on for so long. This thesis consists of two parts. The first being a written investigation of the root causes of our society’s current alienation from nature and the second being a written account of the exhibition of a body of …

Particle Shape As Revealed By Spectral Depolarization, Donald D. Duncan, Michael Eugene Thomas

Electrical and Computer Engineering Faculty Publications and Presentations

Through a series of numerical simulations we explore some scatter effects due to nonspherical particles. Specifically, we examine the link between the aspect ratio of randomly oriented, prolate spheroidal particles and the resulting linear depolarization of the scattered light in the forward and backscatter directions. The particular objective is to detect the presence of randomly oriented particles that have a systematic size and aspect ratio. Calculations show that the spectral behavior of the linear depolarization reveals the aspect ratio of the scattering particles. The concept is demonstrated using the size, shape, and refractive index of the spore form of Bacillus …

A Flight-Proven 2.4ghz Ism Band Cots Communications System For Small Satellites, Ignacio Mas, Christopher Kitts

Small Satellite Conference

A communications system operating in the 2.4GHz ISM unlicensed band was developed for GeneSat-1, an innovative technology demonstration mission intended to validate the use of research quality instrumentation for in situ biological research and processing. As a key underlying mission-enabling technology, and responding to a lowcost, quick turn-around philosophy, this communications system is based on commercial-of-the-shelf components not originally intended for space flight. The system utilizes a frequency hopping spread spectrum technique widely used in wireless phones, Internet hubs and other devices. This approach provided exceptional benefits relevant to small satellite missions: low cost, highly integrated hardware resulting in small …

Billikensat-Ii: The First Bio-Fuel Cell Test Platform For Space , Sanjay Jayaram, Darren Pais, Sonia Hernez, Paul Lemon, Nathaniel Clark, Benjamin Corrado, Brian Vitale, Justin Kerber, Elena Nogales, Jorge Moya, Robert Arechaderra

Small Satellite Conference

Saint Louis University’s Space Systems Research Laboratory has designed and built an earth orbiting student project called BillikenSat-II that will carry a payload to test a Bio-Fuel Cell experiment. This satellite conforms to the CubeSat standard and is a pico-class satellite weighing a maximum of 1 kg and having dimensions of 10 cm x 10 cm x 10 cm. The satellite is to be launched on a converted Russian ICBM via the DNEPR program, in coordination with California Polytechnic and State University (CalPoly, San Luis Obispo, CA) at a launch date to be determined. This paper will describe BillikenSat II’s …

Beyond The Beep: Student-Built Satellites With Educational And 'Real' Missions, Michael Swartwout

Small Satellite Conference

Fifty student-built satellites have been launched in the past four years – as many as had been launched in the twenty years before. But this explosive growth has come at a cost: mission. About half of the satellites launched since 2003 carry no mission other than student education. But does that matter? For independent schools (those without long-term government sponsorship), the answer is a qualified yes. In this paper, we will analyze the launch history of student-built spacecraft to find recommendations for how independent schools can build sustained studentfocused satellite projects.

Flight Results From The Genesat-1 Biological Microsatellite Mission, Christopher Kitts, Karolyn Ronzano, Richard Rasay, Ignacio Mas, Phelps Williams, Paul Mahacek, Giovanni Minelli, John Hines, Elwood Agasid, Charlie Friedericks, Matthew Piccini, Macarena Parra, Linda Timucin, C. Beasley, Mike Henschke, Ed Luzzi, Nghia Mai, Mike Mcintyre, Robert Ricks, David Squires, Chris Storment, John Tucker, Bruce Yost, Greg Defouw, Antonio Ricco

Small Satellite Conference

The mission of the GeneSat-1 technology demonstration spacecraft is to validate the use of research-quality instrumentation for in situ biological research and processing. To execute this mission, the GeneSat-1 satellite was launched on December 16, 2006 from Wallops Flight Facility as a secondary payload off of a Minotaur launch vehicle. During the first week of operation, the core biological growth test was successfully executed, and by the end of the first month of operation all primary science and engineering test objectives had been successfully performed. In its current phase of operation, a variety of secondary technology characterizations tests are being …

A Simple Time Synchronization Scheme For Satellite Clusters In Formation Flying, N. Nagarajan, Dao Thi Hong Diep

Small Satellite Conference

Future communications may use many small satellites flying as a cluster. Such a cluster helps to synthesize very large antennae in space, wherein each satellite becomes the node or element of the antenna structure. A key factor in such a cluster, is the positioning of satellites in absolute as well as relative terms and the time synchronization between them. Ultra Wide Band (UWB) techniques have promising applications for small satellites, because they require only a very small power and support both navigation and communication. In this paper a simple technique i.e ‘transmit and listen’ method is used to demonstrate the …

Five Years Orbit Experience Of A Small Satellite Hyperspectral Imaging Mission, Mike Cutter, Martin Sweeting

Small Satellite Conference

This paper will summarise the results of a hyperspectral imaging mission that has now completed more than five years in orbit and is providing a wealth of data to Users across the world. The mission has demonstrated, fairly conclusively, that such sophisticated payloads can be implemented successfully on a small satellite platform. The instrument being flown is the Compact High Resolution Imaging Spectrometer (CHRIS) developed within the Optical Payload Group (OPG) of Surrey Satellite Technology Ltd. The instrument is flying on PROBA, a small agile satellite, which was launched in October 2001. The platform provides pointing in both across-track and …

2007-2008, Collin College

Course Catalogs

Contains information on courses and class descriptions as well as campus resources at Collin College.

Force-Response Considerations In Ciliary Mechanosensation, Andrew Resnick, Ulrich Hopfer

Physics Faculty Publications

Considerable experimental evidence indicates that the primary, nonmotile cilium is a mechanosensory organelle in several epithelial cell types. As the relationship between cellular responses and nature and magnitude of applied forces is not well understood, we have investigated the effects of exposure of monolayers of renal collecting duct chief cells to orbital shaking and quantified the forces incident on cilia. An exposure of 24 h of these cells to orbital shaking resulted in a decrease of amiloride-sensitive sodium current by ∼60% and ciliary length by ∼30%. The sensitivity of the sodium current to shaking was dependent on intact cilia. The …

Volume 44, Number 86: August 15, 2007, University Of North Dakota

University Letter Archive

No abstract provided.

Long-Term Consequences Of Methamphetamine Exposure In Young Adults Are Exacerbated In Glial Cell Line-Derived Neurotrophic Factor Heterozygous Mice, Heather A. Boger, Lawrence D. Middaugh, Kennerly S. Patrick, Sammanda Ramamoorthy, Emily D. Deheny, Haojie Zhu, Alejandra M. Pacchioni, Ann-Charlotte Granholm, Jacqueline F. Mcginty

MUSC Faculty Journal Articles

Methamphetamine abuse in young adults has long-term deleterious effects on brain function that are associated with damage to monoaminergic neurons. Administration of glial cell line-derived neurotrophic factor (GDNF) protects dopamine neurons from the toxic effects of methamphetamine in animal models. Therefore, we hypothesized that a partial GDNF gene deletion would increase the susceptibility of mice to methamphetamine neurotoxicity during young adulthood and possibly increase age-related deterioration of behavior and dopamine function. Two weeks after a methamphetamine binge (4 x 10 mg/kg, i.p., at 2 h intervals), GDNF +/- mice had a significantly greater reduction of tyrosine hydroxylase immunoreactivity in the …