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2006

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Articles 4981 - 5010 of 5872

Full-Text Articles in Physical Sciences and Mathematics

Models Of Disordered Media And Predictions Of Associated Hydraulic Conductivity, L. Aaron Blank Jr. Jan 2006

Models Of Disordered Media And Predictions Of Associated Hydraulic Conductivity, L. Aaron Blank Jr.

Browse all Theses and Dissertations

In the late 20th century there was a spill of Technetium in eastern Washington State at the US Department of Energy Hanford site. Resulting contamination of water supplies would raise serious health issues for local residents. Therefore, the ability to predict how these contaminants move through the soil is of great interest. The main contribution to contaminant transport arises from being carried along by flowing water. An important control on the movement of the water through the medium is the hydraulic conductivity, K, which defines the ease of water flow for a given pressure difference (analogous to the electrical conductivity). …

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A Field Programmable Gate Array Architecture For Two-Dimensional Partial Reconfiguration, Fei Wang Jan 2006

A Field Programmable Gate Array Architecture For Two-Dimensional Partial Reconfiguration, Fei Wang

Browse all Theses and Dissertations

Reconfigurable machines can accelerate many applications by adapting to their needs through hardware reconfiguration. Partial reconfiguration allows the reconfiguration of a portion of a chip while the rest of the chip is busy working on tasks. Operating system models have been proposed for partially reconfigurable machines to handle the scheduling and placement of tasks. They are called OS4RC in this dissertation. The main goal of this research is to address some problems that come from the gap between OS4RC and existing chip architectures and the gap between OS4RC models and practical applications. Some existing OS4RC models are based on an …

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Importing Extended Producer Responsibility For Electronic Equipment Into The United States, Chad Raphael, Ted Smith Jan 2006

Importing Extended Producer Responsibility For Electronic Equipment Into The United States, Chad Raphael, Ted Smith

Communication

Extended Producer Responsibility (EPR) is a policy approach that holds manufacturers accountable for the full costs of their products at every stage in their life cycle. EPR typically involves requiring that producers take back their products at the end of their useful lives, or pay a recycling contractor to do so, thereby internalizing the costs of recycling or disposal in a manufacturer’s bottom line. When companies know that they will bear the costs of product return and recycling, they are more likely to redesign their products for easier and safer handling at each step in the life cycle. This approach …

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On The Maximum Span Of Fixed-Angle Chains, Nadia Benbernou, Joseph O’Rourke Jan 2006

On The Maximum Span Of Fixed-Angle Chains, Nadia Benbernou, Joseph O’Rourke

Computer Science: Faculty Publications

Soss proved that it is NP-hard to find the maximum flat span of a fixed-angle polygonal chain: the largest distance achievable between the endpoints in a planar embedding. These fixed-angle chains can serve as models of protein backbones. The corresponding problem in 3D is open. We show that two special cases of particular relevance to the protein model are solvable in polynomial time: when all link lengths are equal, and all angles are equal, the maximum 3D span is achieved in a flat configuration and can be computed in constant time. When all angles are equal (but the link lengths …

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Polygons Flip Finitely: Flaws And A Fix, Erik D. Demaine, Blaise Gassend, Joseph O’Rourke, Godfried T. Toussaint Jan 2006

Polygons Flip Finitely: Flaws And A Fix, Erik D. Demaine, Blaise Gassend, Joseph O’Rourke, Godfried T. Toussaint

Computer Science: Faculty Publications

Every simple planar polygon can undergo only a finite number of pocket flips before becoming convex. Since Erdős posed this as an open problem in 1935, several independent purported proofs have been published. However, we uncover a plethora of errors and gaps in these arguments, and remedy these problems with a new (correct) proof.

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Evaluating Lookup-Based Monocular Human Pose Tracking On The Humaneva Test Data, Nicholas Howe Jan 2006

Evaluating Lookup-Based Monocular Human Pose Tracking On The Humaneva Test Data, Nicholas Howe

Computer Science: Faculty Publications

This work presents an evaluation of several lookup-based methods for recovering three-dimensional human pose from monocular video sequences. The methods themselves are largely described elsewhere [1, 2], although the work presented here incorporates a few minor enhancements. The primary contribution of this work is the evaluation of the results on a data set with ground truth available, which allows for quantitative comparisons with other techniques. Methods relying upon silhouettes produced via background subtraction tend to act as a “straw man” in relation to the current state of the art; many recently proposed techniques work without reliance upon background subtraction and …

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Characterization Of The Wheat Grain Pkaba1-Interacting Protein Tawd40, Natalie Wayne Jan 2006

Characterization Of The Wheat Grain Pkaba1-Interacting Protein Tawd40, Natalie Wayne

Honors Theses

Abscisic acid (ABA)-mediated gene expression is a critical component of plant responses to this important hormone, which affects plant growth, development, and responses to environmental stresses. Plant responses to ABA are mediated by a number of factors including PKABA 1> an ABA-induced protein kinase involved in ABA-suppressed gene expression in cereal grains, and TaWD40, which has previously been shown to physically interact with PKABA1. A full-length 1.9 kb TaWD40 cDNA, CK210682, was sequenced as part of this project. Based on the deduced protein sequence, it is thought that TaWD40 may belong to the family of E3 ubiquitin ligases, possibly targeting …

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Terpenic And Phenolic Compounds From Sideritis Stricta, F. Pinar Şahi̇n, Nurten Ezer, İhsan Çaliş Jan 2006

Terpenic And Phenolic Compounds From Sideritis Stricta, F. Pinar Şahi̇n, Nurten Ezer, İhsan Çaliş

Turkish Journal of Chemistry

From the overground parts of an endemic Sideritis species, S. stricta, 4 diterpenes, sideridiol (1), isosidol (2), isolinearol (3), and linearol (4); 2 flavonoid glycosides, isoscutellarein 7-O-[6'''-O-acetyl-\beta -D-allopyranosyl-(1 \to 2)]-\beta -D-glucopyranoside (5), and isoscutellarein 7-O-[6'''-O-acetyl-\beta -D-allopyranosyl-(1 \to 2)]-6''-O-acetyl-\beta -D-glucopyranoside (6); a methoxyflavone, xanthomicrol (7); and a phenylethanoid glycoside, verbascoside (=acteoside) (8) were isolated. The structures of the isolated compounds were established based on spectroscopic evidence (UV, IR, 1D- and 2D-NMR, MS).

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Nutrient Loads In An Urban Ozark Watershed: Jordan, Fassnight And Upper Wilson's Creeks, Springfield, Missouri, Ronald B. Miller Jan 2006

Nutrient Loads In An Urban Ozark Watershed: Jordan, Fassnight And Upper Wilson's Creeks, Springfield, Missouri, Ronald B. Miller

MSU Graduate Theses

The study watershed includes Jordan Creek, the primary stream draining the central downtown area of Springfield, Missouri, and also Fassnight and upper Wilson Creeks. Ten sample sites were established within the watershed and water samples and were collected during baseflow and storm runoff events between August 1, 2004 and July 31, 2005. Samples were tested for total nitrogen (TN), total phosphorus (TP) and selected heavy metals (zinc, arsenic, lead, copper and cadmium) and the parameters pH, specific conductance, turbidity, temperature and dissolved oxygen. Rating curves were used to correlate discharge and water quality variables. Separate rating curves were developed for …

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Evaluating The Biogeochemical Cycle Of Selenium In San Francisco Bay Through Modeling, Shannon L. Meseck, Gregory A. Cutter Jan 2006

Evaluating The Biogeochemical Cycle Of Selenium In San Francisco Bay Through Modeling, Shannon L. Meseck, Gregory A. Cutter

OES Faculty Publications

A biogeochemical model was developed to simulate salinity, total suspended material, phytoplankton biomass, dissolved selenium concentrations (selenite, selenate, and organic selenide), and particulate selenium concentrations (selenite + selenate, elemental selenium, and organic selenide) in the San Francisco Bay estuary. Model-generated estuarine profiles of total dissolved selenium reproduced observed estuarine profiles at a confidence interval of 91- 99% for 8 different years under various environmental conditions. The model accurately reproduced the observed dissolved speciation at confidence intervals of 81-98% for selenite, 72-91% for selenate, and 60-96% for organic selenide. For particulate selenium, model-simulated estuarine profiles duplicated the observed behavior of total …

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Iron In Ice Cores From Law Dome: A Record Of Atmospheric Iron Deposition For Maritime East Antarctica During The Holocene And Last Glacial Maximum, Ross Edwards, Peter N. Sedwick, Vin Morgan, Claude Boutron Jan 2006

Iron In Ice Cores From Law Dome: A Record Of Atmospheric Iron Deposition For Maritime East Antarctica During The Holocene And Last Glacial Maximum, Ross Edwards, Peter N. Sedwick, Vin Morgan, Claude Boutron

OES Faculty Publications

Total dissolvable iron (TDFe) was measured in sections of ice cores recovered from Law Dome on the coast of Wilkes Land, East Antarctica. These samples include ice dating from the Last Glacial Maximum (LGM), the Last Deglaciation, and the early and mid Holocene as well as samples from the Anthropocene that have been dated with seasonal to annual resolution. Combining our TDFe concentration data with estimates of the ice accumulation rate, we estimate the atmospheric iron deposition for Law Dome and the adjacent Southern Ocean during these periods. Our results indicate that the atmospheric iron deposition flux to this region …

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Western Caribbean Sea Surface Temperatures During The Late Quaternary, Matthew W. Schmidt, Maryline J. Vautravers, Howard J. Spero Jan 2006

Western Caribbean Sea Surface Temperatures During The Late Quaternary, Matthew W. Schmidt, Maryline J. Vautravers, Howard J. Spero

OES Faculty Publications

[1] Mg/Ca ratios in the planktonic foraminifera Globigerinoides ruber from Colombian Basin core ODP 999A suggest that Caribbean sea surface temperatures ( SSTs) were from 2.1 to 2.7°C colder than the present during the last three glacial maximums. In comparison, faunal derived SSTs ( SIMMAX method) show that August SSTs in the Caribbean varied < 2° over the past 360 kyr, whereas February SSTs varied between 21.0°C and 26.5°C. Changes in the Mg/Ca-SST record contain a strong 23 kyr periodicity, suggesting the Mg/Ca-SST record reflects a warm season weighted SST average rather than an annual mean SST. Combining several dissolution indices, we identify brief periods of decreased carbonate preservation in our record and show that MIS 11 stands out as the most intensive dissolution cycle in the Caribbean over the last 460 kyr. Comparison of Caribbean SST change with a similar estimate of tropical SST variability in the western Pacific over the past 360 kyr reveals shifts in the east-west tropical SST gradient that are coeval with glacial-interglacial climate change and consistent both with a southward migration of the glacial ITCZ and with a glacial El Niño-like mode of tropical circulation.

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An Examination Of External Influences Imbedded In The Historical Snow Data Of Utah, Randall P. Julander, Michael Bricco Jan 2006

An Examination Of External Influences Imbedded In The Historical Snow Data Of Utah, Randall P. Julander, Michael Bricco

All U.S. Government Documents (Utah Regional Depository)

Snowpack data collection has a long and storied history in Utah as well as the western United States. Many researchers use historical snow course data for various applications ranging from water supply forecasting to climate change. These data are far from a perfect data set and data users should know the errors and limitations within them. In the current setting, only those collecting the data have access to the raw data and the site biographical information. In Utah, records extend back to at least 1912. Systematic measurements began in the mid 1920's with many long term snow courses established at …

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Record Of Decision: Operation Of Flaming Gorge Dam Final Environmental Impact Statement, U.S. Bureau Of Reclamation Jan 2006

Record Of Decision: Operation Of Flaming Gorge Dam Final Environmental Impact Statement, U.S. Bureau Of Reclamation

All U.S. Government Documents (Utah Regional Depository)

The Bureau of Reclamation (Reclamation) has completed a final environmental impact statement (EIS) on the operation of Flaming Gorge Dam. The EIS describes the potential effects of modifying the operation of Flaming Gorge Dam to assist in the recovery of four endangered fish, and their critical habitat, downstream from the dam. The four endangered fish species are Colorado pikeminnow (Ptychocheilus lucius), humpback chub (Gila cypha), razorback sucker (Xyrauchen texanus), and bonytail (Gila elegans). Reclamation would implement the proposed action by modifying the operations of Flaming Gorge Dam, to the extent possible, to achieve the flows and temperatures recommended by participants …

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Revegetation Of Reconstructed Reaches Of The Provo River, Heber Valley, Utah, John A. Rice Jan 2006

Revegetation Of Reconstructed Reaches Of The Provo River, Heber Valley, Utah, John A. Rice

All U.S. Government Documents (Utah Regional Depository)

Prior to the 1950s, the middle Provo River in Utah offered outstanding fish and wildlife habitat. This was due in part to the Provo River freely meandering through the Heber Valley. These bends in the river provided deep holes for fish and a dense streamside forest for many species of birds. This productive habitat was altered in the 1940s and 1950s when the river was dammed, channelized, and forced between dikes (figure 1). These dikes were constructed by the USDI Bureau of Reclamation (USBR) to contain high flows that came from additional water added to the Provo River from transbasin …

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Genetic Stratigraphy And Geochronology Of Last Interglacial Shorelines On The Central Coast Of South Carolina, Russell Willis Jan 2006

Genetic Stratigraphy And Geochronology Of Last Interglacial Shorelines On The Central Coast Of South Carolina, Russell Willis

LSU Master's Theses

This study investigated the shallow subsurface of the Lower Coastal Plain of South Carolina in order to determine the sea-level history and stratigraphic architecture preserved within several emergent shoreline complexes. The absolute age of each shoreline complex was estimated using single-aliquot regenerative-dose (SAR) optically stimulated luminescence (OSL) techniques. The resulting geochronology was incorporated into a high-resolution stratigraphic framework defined by ground penetrating radar calibrated with deep sediment cores, many of which contain a complete sequence of highstand deposition. Three emergent barrier complexes were identified within the Lower Talbot, Pamlico, and Princess Anne terraces, and assigned to sea-level highstands during interglacial …

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Expression Of Tumor Suppressor Genes During Breast Cancer Progression In The Rat, Wafa Saqer Rashid Abdullah Aldhaheri Jan 2006

Expression Of Tumor Suppressor Genes During Breast Cancer Progression In The Rat, Wafa Saqer Rashid Abdullah Aldhaheri

Theses

Breast cancer is the most common type of cancer and the leading cause of cancer deaths among women in the United Arab Emirates and all over the world. Although many factors contribute to the high incidence of breast cancer, a considerable number of cases are related to environmental factors. In this study, breast cancer was induced in female rats using a single dose, 80 mg/kg body wt, of the environmental carcinogen 7,12- dimethylbenz[a]anthracene (DMBA). The aim was to characterize some of the early cellular and molecular changes that occur during breast cancer development in the DMBA-treated rat model. Mammary gland …

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A Study Of Factors Influencing The Occurrence Of Algae Bloom (Hab) Along The Abu Dhabi Coast, Uae., Buthaina Salem Saeed Al Qubaisi Jan 2006

A Study Of Factors Influencing The Occurrence Of Algae Bloom (Hab) Along The Abu Dhabi Coast, Uae., Buthaina Salem Saeed Al Qubaisi

Theses

During last few years, the frequency of Harmful Algal Bloom (HAB) has increased worldwide. The occurrence of HAB in the Gulf region has only recently been recorded in the United Arab Emirates (UAE). Specifically, these occurrences have not been thoroughly investigated. This phenomena, was found to be associated with the increase in nutrient load, depletion of oxygen and a significant decrease in fish populations that is caused by a bloom of a certain phytoplankton species, results in economic and social problems. Therefore, the Environment Agency-Abu Dhabi (EAD) has decided to conduct a study on different aspects of this phenomenon of …

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Segmental Dynamics Of Poly(Vinyl Acetate)- D₃ Absorbed On Silica By Solid State 2hnmr: Effect Of Small Molecule Plasticizer, Rakesh R. Nambiar, Frank D. Blum Jan 2006

Segmental Dynamics Of Poly(Vinyl Acetate)- D₃ Absorbed On Silica By Solid State 2hnmr: Effect Of Small Molecule Plasticizer, Rakesh R. Nambiar, Frank D. Blum

Chemistry Faculty Research & Creative Works

There has been significant progress in understanding the behavior of polymeric thin films on surfaces. The change in the apparent glass transition temperature (Tg) of supported thin polymer films with thickness (Tg -nanoconfinement effect) has been widely studied over the last fifteen years. While many studies focused on the thickness dependence of Tg, there are other aspects which are important to understand in a nanoconfined polymer system. For example, polymeric photoresists contain small-molecule photoactive compounds, plasticizers, and processing aids. These components interact with the polymer chains and affect the segmental mobility, which, in turn, affects the Tg - nanoconfinement effect. …

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Puncturing Ability Of Idealized Canine Teeth: Edged And Non-Edged Shanks, Patricia W. Freeman, Cliff A. Lemen Jan 2006

Puncturing Ability Of Idealized Canine Teeth: Edged And Non-Edged Shanks, Patricia W. Freeman, Cliff A. Lemen

School of Natural Resources: Faculty Publications

Idealized edged and non-edged indenters, mimicking canine teeth, were used to puncture thin materials and thick materials. Less force was needed for the edged (triangular in cross section) indenter to penetrate thin Mylar, paper, leather, beetle elytra and turkey skin than the non-edged (circular in cross-section) indenter. Oak, grass and magnolia leaves responded equally to both indenters. In thick materials, the edged indenter punctured beetles, shrimp, bananas, and chicken flesh more easily than the non-edged indenter. Apple, tomato and avocado were punctured equally well. The edged indenter directs cracks at the corners so that the material can fold away in …

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Integral Cohomology Of The Siegel Modular Variety Of Degree Two And Level Three, Mustafa Arslan Jan 2006

Integral Cohomology Of The Siegel Modular Variety Of Degree Two And Level Three, Mustafa Arslan

LSU Doctoral Dissertations

In this thesis work Deligne's spectral sequence Ep,qr with integer coefficients for the embedding of the Siegel modular variety of degree two and level three, A2(3) into its Igusa compactification, A2(3)*, is investigated. It is shown that E3 = E∞ and this information is applied to compute the cohomology groups of A2(3) over the integers.

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The Asymptotics Of Neutral Curve Crossing In Taylor–Dean Flow, C. P. Hills, A. P. Bassom Jan 2006

The Asymptotics Of Neutral Curve Crossing In Taylor–Dean Flow, C. P. Hills, A. P. Bassom

Articles

The fluid flow between a pair of coaxial circular cylinders generated by the uniform rotation of the inner cylinder and an azimuthal pressure gradient is susceptible to both Taylor and Dean type instabilities. The flow can be characterised by two parameters: a measure of the relative magnitude of the rotation and pressure effects and a non-dimensional Taylor number. This work considers the small gap, large wavenumber limit for linear perturbations when the onset of the Taylor and Dean instabilities is concurrent. A consistent, matched asymptotic solution is found across the whole annular domain and identifies five regions of interest: two …

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Archaeological Geology And Postglacial Development Of The Central Penobscot River Valley, Maine, Usa, Alice Repsher Kelley Jan 2006

Archaeological Geology And Postglacial Development Of The Central Penobscot River Valley, Maine, Usa, Alice Repsher Kelley

Electronic Theses and Dissertations

The purpose of this interdisciplinary study is to provide a geological and environmental context for the Late Pleistocene and Holocene Native American occupation of the central Penobscot River Valley, Maine. In addition, this work provides a model for the regional synthesis of geological, archaeological, and paleoenvironmental data in order to examine large-scale patterns of archaeological site formation and preservation. The postglacial central Penobscot Valley experienced varied and rapid landscape changes. Withdrawal of the Laurentide Ice Sheet was followed by marine transgression and regression. Subaerial exposure initiated landscape development. The postglacial Penobscot River rapidly excavated a channel through glacial sediments, creating …

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Spatial And Temporal Changes In Stream Chemistry At Three Watersheds During High Discharge Episodes, Mollie Kate Laird Jan 2006

Spatial And Temporal Changes In Stream Chemistry At Three Watersheds During High Discharge Episodes, Mollie Kate Laird

Electronic Theses and Dissertations

A longitudinal study of first order streams in three forested watersheds was conducted to determine spatial and temporal trends in geochemistry during high discharge acidic episodes. The watersheds were East Bear Brook and Hadlock Brook (Maine, USA), and Fernow WS3 (West Virginia, USA). Watersheds were selected based on soil type, stream pH, and historical chemistry. Stream sampling sites were distributed along an elevational gradient and sampled simultaneously during a high discharge episode. Base flow samples were collected prior to the start of the hydrological event. The Maine watersheds, East Bear Brook and Hadlock Brook, were sampled during fall 2005 rain …

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Experimental Infection Of Fox Squirrels (Sciurus Niger) With West Nile Virus, J. Jeffrey Root, Paul T. Oesterle, Nicole M. Nemeth, Kaci Klenk, Daniel H. Gould, Robert G. Mclean, Larry Clark, Jeffrey S. Hall Jan 2006

Experimental Infection Of Fox Squirrels (Sciurus Niger) With West Nile Virus, J. Jeffrey Root, Paul T. Oesterle, Nicole M. Nemeth, Kaci Klenk, Daniel H. Gould, Robert G. Mclean, Larry Clark, Jeffrey S. Hall

United States Department of Agriculture Wildlife Services: Staff Publications

Tree squirrels (Sciurus spp.) have exhibited high seroprevalence rates, suggesting that they are commonly exposed to West Nile virus (WNV). Many characteristics of WNV infections in tree squirrels, such as the durations and levels of viremia, remain unknown. To better understand WNV infections in fox squirrels (S. niger), we subcutaneously inoculated fourteen fox squirrels with WNV. Peak viremias ranged from 104.00 plaque-forming units (PFU)/mL of serum on day 2 post-infection (DPI) to 104.98 PFU/mL on 3 DPI, although viremias varied between individuals. Oral secretions of some fox squirrels were positive for WNV viral RNA, occasionally …

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Effect Of Method Of Delivering Nicarbazin To Mallards On Plasma 4,4′-Dinitrocarbanilide Levels And Reproduction, C. A. Yoder, J. K. Graham, L. A. Miller, K. S. Bynum, J. J. Johnston, M. J. Goodall Jan 2006

Effect Of Method Of Delivering Nicarbazin To Mallards On Plasma 4,4′-Dinitrocarbanilide Levels And Reproduction, C. A. Yoder, J. K. Graham, L. A. Miller, K. S. Bynum, J. J. Johnston, M. J. Goodall

United States Department of Agriculture Wildlife Services: Staff Publications

Nicarbazin (NCZ), a coccidiostat used in the poultry industry, has been developed as a contraceptive for resident Canada geese. We tested the efficacy of NCZ as a contraceptive using mallards (Anas platyrhynchos) as a model for Canada geese. Nicarbazin-treated corn was fed ad libitum for 14 d at 0, 750, 1,000, or 1,500 ppm. Plasma and egg levels of 4,4′-dinitrocarbanilide (DNC), the active anticoccidial component of NCZ, differed among treatment groups in a dose-response relationship, but plasma levels did not differ between sexes. Nicarbazin caused a decrease in egg weight, but there was no effect of NCZ on …

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Evaluation Of Nicarbazin As A Potential Waterfowl Contraceptive Using Mallards As A Model, C. A. Yoder, J. K. Graham, L. A. Miller, K. S. Bynum, J. J. Johnston, M. J. Goodall Jan 2006

Evaluation Of Nicarbazin As A Potential Waterfowl Contraceptive Using Mallards As A Model, C. A. Yoder, J. K. Graham, L. A. Miller, K. S. Bynum, J. J. Johnston, M. J. Goodall

United States Department of Agriculture Wildlife Services: Staff Publications

Contraception may provide a useful nonlethal management tool to reduce wild bird populations. We tested the efficacy of nicarbazin (NCZ) as a contraceptive for waterfowl and assessed health effects of NCZ, using domestic mallards (Anas platyrhynchos) as a model for Canada geese (Branta canadensis). Mallards were given gelatin capsules containing 0, 8.5, 17.0, or 33.75 mg of NCZ/kg of BW perorally once daily for 14 d. Fecal 4,4′- dinitrocarbanilide (DNC) and fluorescein were evaluated as potential markers of plasma and egg DNC levels. Plasma, egg, and fecal DNC levels differed among treatment groups in a dose …

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Monitoring Invasive Mammalian Predator Populations Sharing Habitat With The Critically Endangered Puerto Rican Parrot Amazona Vittata, Richard M. Engeman, Desley Whisson, Jessica Quinn, Felipe Cano, Pedro Quiñones, Thomas H. White Jan 2006

Monitoring Invasive Mammalian Predator Populations Sharing Habitat With The Critically Endangered Puerto Rican Parrot Amazona Vittata, Richard M. Engeman, Desley Whisson, Jessica Quinn, Felipe Cano, Pedro Quiñones, Thomas H. White

United States Department of Agriculture Wildlife Services: Staff Publications

Critically Endangered Puerto Rican parrots Amazona vittata are one of the rarest birds in the world. Several exotic mammal species capable of preying on Puerto Rican parrots cohabit the Caribbean National Forest with the only wild population of these parrots. We used tracking plates, monitoring blocks and trapping to index black rats, small Indian mongooses and feral cats in parrot habitat and in public-use areas in the same habitat type. We had high trap success for black rats at all sites (42% of all sites combined), among the highest reported in the world. Rat response to monitoring (nontoxic bait) blocks …

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Red-Winged Blackbird (Agelaius Phoeniceus) Reproduction In North Dakota, Rachel M. Bush, Mark E. Clark, Wendy L. Read, George M. Linz Jan 2006

Red-Winged Blackbird (Agelaius Phoeniceus) Reproduction In North Dakota, Rachel M. Bush, Mark E. Clark, Wendy L. Read, George M. Linz

United States Department of Agriculture Wildlife Services: Staff Publications

No abstract provided.

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Determination Of Diphacinone Residues In Hawaiian Invertebrates, Thomas M. Primus, Dennis J. Kohler, John J. Johnston Jan 2006

Determination Of Diphacinone Residues In Hawaiian Invertebrates, Thomas M. Primus, Dennis J. Kohler, John J. Johnston

United States Department of Agriculture Wildlife Services: Staff Publications

A reversed-phase ion-pair liquid chromatographic analysis combined with a solid-phase extraction clean-up method is used to assess the quantity of diphacinone residue found in invertebrates. Three invertebrate species are exposed to commercially available diphacinone-fortified bait used for rat control. The invertebrate samples are collected, frozen, and shipped to the laboratory. The samples are homogenized after cryogenic freezing. A portion of the homogenized samples are extracted with acidified chloroform–acetone, followed by cleanup with a silica solid-phase extraction column. Diphacinone is detected by UV absorption at 325 nm after separation by the chromatographic system. The method limit of detection (MLOD) for snail …

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