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Arthropod And Plant Communities As Indicators Of Land Rehabilitation Effectiveness In A Semiarid Shrubsteppe, Eric T. Gardner, Val J. Anderson, Robert L. Johnson Dec 2009

Arthropod And Plant Communities As Indicators Of Land Rehabilitation Effectiveness In A Semiarid Shrubsteppe, Eric T. Gardner, Val J. Anderson, Robert L. Johnson

Western North American Naturalist

We describe a case study evaluating the ecological impact of Bromus tectorum L. (cheatgrass) invasion following fire disturbance and the effectiveness of revegetation as a means of rehabilitation in a degraded semiarid shrubsteppe system. The effectiveness of rehabilitation efforts was assessed relative to arthropod richness, vegetation and arthropod community composition, and ground-cover characteristics in 3 habitats: undisturbed, burned and weed infested (B. tectorum), and burned then rehabilitated with native and nonnative vegetation. Arthropods were collected in each habitat using pitfall traps. Differences in arthropod richness were compared using rarefaction curves. Nonmetric multidimensional scaling and nonparametric multivariate statistical procedures, …

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Records Of The Yellow-Nosed Cotton Rat (Sigmodon Ochrognathus) In Southwestern New Mexico, Keith Geluso Dec 2009

Records Of The Yellow-Nosed Cotton Rat (Sigmodon Ochrognathus) In Southwestern New Mexico, Keith Geluso

Western North American Naturalist

The yellow-nosed cotton rat (Sigmodon ochrognathus) previously was known only from extreme southwestern New Mexico in the Peloncillo and Animas mountains. Here I document S. ochrognathus at 3 localities from the Big Burro and Mogollon mountains in southwestern New Mexico. My northernmost capture represents an extra-limital record of 160 km north of prior records in southern New Mexico and represents the northernmost occurrence in North America. Lack of intensive mammalian surveys in the region render it difficult to interpret my recent captures, but the most parsimonious explanation is that captures likely represent overlooked populations. I captured S. ochrognathus …

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Front Matter, Vol. 69 No. 4 Dec 2009

Front Matter, Vol. 69 No. 4

Western North American Naturalist

No abstract provided.

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Stephen Lane Wood, 1924–2009: Obituary Dec 2009

Stephen Lane Wood, 1924–2009: Obituary

Western North American Naturalist

No abstract provided.

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Population Ecology And Reproduction Of The Mexican Mud Turtle (Kinosternon Integrum) In Tonatico, Estado De México, Rodrigo Macip-Ríos, Maria De Lourdes Arias Cisneros, Xochitl S. Aguilar-Miguel, Gustavo Casas-Andreu Dec 2009

Population Ecology And Reproduction Of The Mexican Mud Turtle (Kinosternon Integrum) In Tonatico, Estado De México, Rodrigo Macip-Ríos, Maria De Lourdes Arias Cisneros, Xochitl S. Aguilar-Miguel, Gustavo Casas-Andreu

Western North American Naturalist

Ecological data directly from the field are important in understanding the life history strategies of kinosternid species in the tropics. Herein we summarize the basic population ecology and life history of Kinosternon integrum in the municipality of Tonatico (southeastern Estado de México, México). From October 2003 to November 2004, we marked a total of 204 turtles and recaptured 118 of them. Mean population size using the Jolly-Seber model was 197 (95% CI 128–416) individuals, with a sex ratio of 1:1.7, biased to females. Males were larger than females in carapace length and plastron length. The reproductive season starts in late …

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End Matter, Vol. 69 No. 4 Dec 2009

End Matter, Vol. 69 No. 4

Western North American Naturalist

No abstract provided.

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Differential Phytosociological Interactions Involving Male And Female Atriplex Bonnevillensis, Jordan Sinclair, John M. Emlen, Matthew Rinella, Jessica Snelgrove, D. Carl Freeman Dec 2009

Differential Phytosociological Interactions Involving Male And Female Atriplex Bonnevillensis, Jordan Sinclair, John M. Emlen, Matthew Rinella, Jessica Snelgrove, D. Carl Freeman

Western North American Naturalist

Wind-pollinated dioecious plants often exhibit spatial segregation of the sexes. This partial niche separation has most often been explored using abiotic niche axes. However, if the sexes are truly separated in space, then they are apt to encounter different plant species that may heavily affect growth and reproduction. Also, to the extent that their niches differ, the sexes may respond differently to the same co-occurring species. Here we examine interspecific interactions that influence male and female reproductive potential in Atriplex bonnevillensis. Using Emlen's interaction assessment, a technique which assesses species interactions based on cover classes, we show that Salsola species …

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Distribution And Postbreeding Environmental Relationships Of Northern Leopard Frogs (Rana [Lithobates] Pipiens) In Washington, Stephen S. Germaine, Dave W. Hays Dec 2009

Distribution And Postbreeding Environmental Relationships Of Northern Leopard Frogs (Rana [Lithobates] Pipiens) In Washington, Stephen S. Germaine, Dave W. Hays

Western North American Naturalist

Northern leopard frogs (Rana [Lithobates] pipiens) are considered sensitive, threatened, or endangered in all western states and western Canadian provinces. Historically present in eastern Washington in 6 major river drainages, leopard frogs are now only known to occur at 2 localized areas in the Crab Creek drainage in Grant County. During the summers of 2002–2005, we surveyed both areas to document extent of leopard frog distributions and to describe habitat and vertebrate community characteristics associated with leopard frog site occupancy. At Gloyd Seeps, 2 juvenile leopard frogs were observed in a total of 8.2 person-days of …

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Note On The Occurrence Of Siphlonurus Autumnalis (Ephemeroptera: Siphlonuridae) In A Montana Spring Brook, Robert L. Newell, Michelle L. Anderson Dec 2009

Note On The Occurrence Of Siphlonurus Autumnalis (Ephemeroptera: Siphlonuridae) In A Montana Spring Brook, Robert L. Newell, Michelle L. Anderson

Western North American Naturalist

The little-known mayfly Siphlonurus autumnalis McDunnough (Ephemeroptera: Siphlonuridae) was collected from several locations in its floodplain habitats along the Middle Fork of the Flathead River in western Montana. To confirm identification, nymphs were reared along with an associated species, S. occidentalis Eaton (Ephemeroptera: Siphlonuridae). Adults emerged from 6 September until 16 October. Habitats are described and the first photos of the 2 sexes are provided.

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Controls On Radial Growth Of Mountain Big Sagebrush And Implications For Climate Change, Rebecca E. Poore, Christine A. Lamanna, James J. Ebersole, Brian J. Enquist Dec 2009

Controls On Radial Growth Of Mountain Big Sagebrush And Implications For Climate Change, Rebecca E. Poore, Christine A. Lamanna, James J. Ebersole, Brian J. Enquist

Western North American Naturalist

Mountain big sagebrush (Artemisia tridentata Nutt. ssp. vaseyana) covers large areas in arid regions of western North America. Climate-change models predict a decrease in the range of sagebrush, but few studies have examined details of predicted changes on sagebrush growth and the potential impacts of these changes on the community. We analyzed effects of temperature, precipitation, and snow depth on sagebrush annual ring width for 1969 to 2007 in the Gunnison Basin of Colorado. Temperature at all times of year except winter had negative correlations with ring widths; summer temperature had the strongest negative relationship. Ring widths correlated …

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Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen Dec 2009

Influence Of Soil Water Repellency On Post-Fire Revegetation Success And Management Techniques To Improve Establishment Of Desired Species, Matthew D. Madsen

Theses and Dissertations

The influence of soil water repellency (WR) on vegetation recovery after a fire is poorly understood. This dissertation presents strategies to broaden opportunities for enhanced post-fire rangeland restoration and monitoring of burned piñon and juniper (P-J) woodlands by: 1) mapping the extent and severity of critical and subcritical WR, 2) determining the influence of WR on soil ecohydrologic properties and revegetation success, and 3) evaluating the suitability of a wetting agent composed of alkylpolyglycoside-ethylene oxide/propylene oxide block copolymers as a post-fire restoration tool for ameliorating the effects of soil WR and increasing seedling establishment. Results indicate that:

• Post-fire patterns …

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Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott Dec 2009

Carbon Coated Tellurium For Optical Data Storage, Jonathan D. Abbott

Theses and Dissertations

A highly durable optical disk has been developed for data archiving. This optical disk uses tellurium as the write layer and carbon as a dielectric and oxidation prevention layer. The sandwich style CTeC film was deposited on polycarbonate and silicon substrates by plasma sputtering. These films were then characterized with SEM, TEM, EELS, ellipsometry, ToF-SIMS, etc, and were tested for writability and longevity. Results show the films were uniform in physical structure, are stable, and able to form permanent pits. Data was written to a disk and successfully read back in a commercial DVD drive.

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Inferring Dispersal Of Aquatic Invertebrates From Genetic Variation: A Comparative Study Of An Amphipod (Talitridae Hyalella Azteca) And Mayfly (Baetidae Callibaetis Americanus) In Great Basin Springs, Heather Lynn Stutz Dec 2009

Inferring Dispersal Of Aquatic Invertebrates From Genetic Variation: A Comparative Study Of An Amphipod (Talitridae Hyalella Azteca) And Mayfly (Baetidae Callibaetis Americanus) In Great Basin Springs, Heather Lynn Stutz

Theses and Dissertations

Whether active or passive, dispersal accompanied by gene flow shapes the population genetics and evolutionary divergence of species. Indirect methods which use genetic markers have the ability to assess effective dispersal—that which resulted in gene flow. My objective was to see if an aquatic insect and an obligate aquatic invertebrate show similar phylogeographic patterns and genetic uniqueness. Hyalella azteca and Callibaetis americanus were collected from 4-5 springs in each of six basins in the Great Basin of western North America. No dispersal or genetic studies of C. americanus have been conducted to date. However, several studies focusing on mtDNA diversity …

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Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis Dec 2009

Development Of A Methodology For Numerical Simulation Of A D C Arc Discharge In A Liquid Dielectric, Christopher James Lewis

Theses and Dissertations

The majority of literature regarding the numerical simulation of arc discharges in gaseous environments has used a plasma physics approach. Virtually all simulations treat the discharge as an idealized gaseous plasma, which can be described by temperature, pressure, and electric field. This approach can work well if the media is a shielding gas such as Argon; however, the approach does not work well for processes such as underwater welding, EDM, and underwater discharges used to generate high purity particles. The reason these discharges do not have many extensive simulation efforts as described in the literature is because they occur in …

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Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen Dec 2009

Acoustic Mediation Of Vocalized Emotion Identification: Do Decoders Identify Emotions Idiographically Or Nomothetically?, Michael Kenneth Lauritzen

Theses and Dissertations

Most research investigating vocal expressions of emotion has focused on one or more of three questions: whether there exist unique acoustic profiles of individual encoded emotions, whether the nature of emotion expression is universal across cultures, and how accurately decoders can identify expressed emotions. This dissertation begins to answer a fourth question, whether there exist unique patterns in the types of acoustic properties persons focus on to identify vocalized emotions. Three hypotheses were tested: first, whether acoustic patterns are interpreted idiographically or nomothetically as reflected in a comparison of individual vs. group lens model identification ratios; second, whether there exists …

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Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy Dec 2009

Comparison Of Single-Use And Multiple-Use Electrodes For Sensory, Motor Threshold Amplitudes And Force Production, Lucia Maloy

Theses and Dissertations

Context: Electrodes play an important role in interfacing tissue with electrical stimulation devices. Manufacturers recommend that adhesive metallic mesh cloth electrodes be used no more than 10 times before they are discarded, however, clinically the electrodes are often used up to 30 times. Another concern is sanitation. When electrodes are used on different patients, there is a chance for cross-contamination and bacterial growth on the electrode. Objective: To compare amplitudes of perceived sensation, motor twitch and force produced at specific amplitudes using single-use electrodes that run no risk of cross-contamination, and multiple-use electrodes. Design: Mixed model ANOVA with the subject …

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Progress Toward The Total Synthesis Of Lyconadin A, Yu Zhang Dec 2009

Progress Toward The Total Synthesis Of Lyconadin A, Yu Zhang

Theses and Dissertations

Lyconadin A is a pentacyclic Lycopodium alkaloid isolated from the club moss Lycopodium complanatum with antitumor properties. We have developed a novel 7-exo/6-exo acyl radical cascade cyclization as a method of making the bicyclo[5.4.0]undecane ring system of lyconadin A. The model products are trans-fused ring systems, while a cis-fused ring system is needed in lyconadin A. We have discovered a method to convert the trans-fused model cascade cyclization product into the desired cis isomer. Based on Donohoe's pyridone synthesis, we developed a method for the construction of 5-alkyl and 3,5-dialkyl-6-carbomethoxy-2-pyridones, the former of which …

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Environmental Dna Sequencing Primers For Eutardigrades And Bdelloid Rotifers, Byron J. Adams, Jeremy Whiting, Elizabeth K. Costello, Kristen R. Freeman, Andrew P. Martin, Michael S. Robeson, Steve K. Schmidt Dec 2009

Environmental Dna Sequencing Primers For Eutardigrades And Bdelloid Rotifers, Byron J. Adams, Jeremy Whiting, Elizabeth K. Costello, Kristen R. Freeman, Andrew P. Martin, Michael S. Robeson, Steve K. Schmidt

Faculty Publications

Background: The time it takes to isolate individuals from environmental samples and then extract DNA from each individual is one of the problems with generating molecular data from meiofauna such as eutardigrades and bdelloid rotifers. The lack of consistent morphological information and the extreme abundance of these classes makes morphological identification of rare, or even common cryptic taxa a large and unwieldy task. This limits the ability to perform large-scale surveys of the diversity of these organisms. Here we demonstrate a culture-independent molecular survey approach that enables the generation of large amounts of eutardigrade and bdelloid rotifer sequence data directly …

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Analysis Of Electromagnetic And Seismic Geophysical Methods For Investigating Shallow Sub-Surface Hydrogeology, Eric M. Parks Dec 2009

Analysis Of Electromagnetic And Seismic Geophysical Methods For Investigating Shallow Sub-Surface Hydrogeology, Eric M. Parks

Theses and Dissertations

An integrated electromagnetic (EM) and seismic geophysical study was performed to evaluate non-invasive approaches to estimate depth to shallow groundwater in arid environments with elevated soil salinity where the installation of piezometers would be impractical or prohibited. Both methods were tested in two study areas (semi-arid and arid respectively), one in Palmyra, Utah, USA near the shore of Utah Lake where groundwater is shallow and unconfined in relatively homogeneous lacustrine sediments. The other area is Carson Slough, Nevada, USA near Ash Meadows National Wildlife Refuge in Amargosa Valley. The area is underlain by valley fill, with generally variable shallow depths …

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The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen Dec 2009

The Ecological Importance Of Extrinsic And Intrinsic Drivers Of Animal Movement, Josh Earl Rasmussen

Theses and Dissertations

The movement of individuals is foundational to many ecological processes. For example, the movement of an organism from one place to another alters population density at both sites and has potential for affecting the genetic dynamics within the new population. Individual movement events may be in synchrony with overall trends in populations, e.g. spawning migrations, or may be atypical (asynchronous). This latter movement type can affect population and metapopulation dynamics, depending on its prevalence within a population. Nevertheless, given the complexity of interactions, the causative factors of movement are understood vaguely, much less for aquatic organisms. Drivers of movement are …

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Cocaine And Mefloquine-Induced Acute Effects In Ventral Tegmental Area Dopamine And Gaba Neurons, David Wilbanks Allison Dec 2009

Cocaine And Mefloquine-Induced Acute Effects In Ventral Tegmental Area Dopamine And Gaba Neurons, David Wilbanks Allison

Theses and Dissertations

The aim of the two studies presented here was to evaluate the effects of cocaine and mefloquine (MFQ) on γ-aminobutyric acid (GABA) and dopamine (DA) neurons in the ventral tegmental area (VTA). Cocaine: In vivo, lower doses of intravenous cocaine (0.25-0.5 mg/kg), or methamphetamine (METH), enhanced VTA GABA neuron firing rate via D2/D5 receptor activation. Higher cocaine doses (1.0-2.0 mg/kg) inhibited their firing rate. Cocaine and lidocaine inhibited the firing rate and spike discharges induced by stimulation of the internal capsule (ICPSDs) at dose levels 0.25-2 mg/kg (IC50 1.2 mg/kg), but neither DA nor METH reduced ICPSDs. In VTA …

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Ecophysiological Mechanisms Underlying Aspen To Conifer Succession, William J. Calder Dec 2009

Ecophysiological Mechanisms Underlying Aspen To Conifer Succession, William J. Calder

Theses and Dissertations

This thesis includes three studies. The first study examined how reductions in light availability and changes in soil chemistry that occur as conifers establish in aspen stands, differentially affects the regeneration success of aspen and conifers. We found that aspen were more sensitive to changes in light and soil then subalpine fir. For aspen, reduced light and conifer influenced soils significantly reduced height, biomass, photosynthesis and the production of secondary defense compounds. Subalpine fir seedlings were significantly reduced in photosynthesis, biomass and R:S under lower light conditions but showed no differences in physiology or growth when grown on the contrasting …

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College Students And Stress Management: Utilizing Biofeedback And Relaxation Skills Training, Shannon Jones Anstead Dec 2009

College Students And Stress Management: Utilizing Biofeedback And Relaxation Skills Training, Shannon Jones Anstead

Theses and Dissertations

This study was undertaken to evaluate the effectiveness of biofeedback and relaxation skills training to help alleviate college students' stress symptoms. Data was collected from 659 full-time college students who attended a total of 1,170 biofeedback sessions over the course of two years. Results of the study indicated that the top three stress-related symptoms students experienced were (a) feeling overwhelmed, (b) feeling anxious, and (c) difficulty concentrating. Furthermore, the top three stressors rated by students were (a) too much to do, (b) homework, and (c) classes and school. In addition, the top three coping strategies utilized by students to manage …

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Genetic Dissection Of Triterpenoid Saponin Production In Chenopodium Quinoa Using Microarray Analysis, Derrick James Reynolds Dec 2009

Genetic Dissection Of Triterpenoid Saponin Production In Chenopodium Quinoa Using Microarray Analysis, Derrick James Reynolds

Theses and Dissertations

Quinoa (Chenopodium quinoa Willd.) is an important food crop for subsistence farmers in the Altiplano (high plains) of Peru, Bolivia, and Argentina. Saponins are part of a diverse family of secondary metabolites that are found in high concentrations in the pericarp of many varieties of quinoa. Due to their bitter taste and anti-nutritive properties, saponins must be removed before the quinoa grain is consumed. There are ‘sweet’ varieties of quinoa that have significantly reduced levels of saponin. Previous research suggests saponin production is controlled by a single locus. The major objective of this research was to elucidate the genetic …

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Compact Trench-Based Silicon-On-Insulator Rib Waveguide Ring Resonator With Large Free Spectral Range, Seunghyun Kim, Gregory P. Nordin, Weisheng Hu, Yusheng Qian, Jiguo Song, Gregory L. Wojcik Dec 2009

Compact Trench-Based Silicon-On-Insulator Rib Waveguide Ring Resonator With Large Free Spectral Range, Seunghyun Kim, Gregory P. Nordin, Weisheng Hu, Yusheng Qian, Jiguo Song, Gregory L. Wojcik

Faculty Publications

We demonstrate a compact trench-based silicon-on-insulator (SOI) rib waveguide ring resonator comprised of trench-based bends and splitters. It has a perimeter of 50 μm and occupies an area of only 25×25 μm. The measured free spectral range (FSR) is 13.2 nm, which the largest reported for an SOI rib waveguide ring resonator. The measured FSR, full width at half maximum, and quality factor match reasonably well with analytical calculations. Further calculation shows that a FSR of 50.8 nm is achievable for an SOI rib waveguide ring resonator with a perimeter of 15 μm.

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Using Artificial Neural Networks And Model Predictive Control To Optimize Acoustically Assisted Doxorubicin Release From Polymeric Micelles, Ghaleb A. Husseini, Farouq S. Mjalli, William G. Pitt, Nabil M. Abdel-Jabbar Dec 2009

Using Artificial Neural Networks And Model Predictive Control To Optimize Acoustically Assisted Doxorubicin Release From Polymeric Micelles, Ghaleb A. Husseini, Farouq S. Mjalli, William G. Pitt, Nabil M. Abdel-Jabbar

Faculty Publications

We have been developing a drug delivery system that uses Pluronic P105 micelles to sequester a chemotherapeutic drug - namely, Doxorubicin (Dox) - until it reaches the cancer site. Ultrasound is then applied to release the drug directly to the tumor and in the process minimize the adverse side effects of chemotherapy on non-tumor tissues. Here, we present an artificial neural network (ANN) model that attempts to model the dynamic release of Dox from P105 micelles under different ultrasonic power intensities at two frequencies. The developed ANN model is then utilized to optimize the ultrasound application to achieve a target …

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Mothers' Perceptions Of Website Information In Solving Behavioral Problems In Children With Disabilities, Heather Collins Nov 2009

Mothers' Perceptions Of Website Information In Solving Behavioral Problems In Children With Disabilities, Heather Collins

Theses and Dissertations

This research investigated the needs of mothers in regard to designing an educational website for parents/caregivers of children with disabilities. This research was designed to provide information to inform outreach efforts of Brigham Young University's Family HOPE (Happiness, Optimism, Promise, and Excellence) Project. This project assists families struggling with child behavior problems. Results from this study provided an initial understanding of the potential for a website to offer support to families not directly served through the Family HOPE project. Participants included 26 adult females, 25 mothers and one female caregiver. Each participant was the primary caregiver of a child with …

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In-Plane, All-Photonic Transduction Method For Silicon Photonic Microcantilever Array Sensors, Jong Wook Noh Nov 2009

In-Plane, All-Photonic Transduction Method For Silicon Photonic Microcantilever Array Sensors, Jong Wook Noh

Theses and Dissertations

We have invented an in-plane all-photonic transduction method for photonic microcantilever arrays that is scalable to large arrays for sensing applications in both bio- and nanotechnology. Our photonic transduction method utilizes a microcantilever forming a single mode rib waveguide and a differential splitter consisting of an asymmetric multimode waveguide and a Y-branch waveguide splitter. The differential splitter's outputs are used to form a differential signal that has a monotonic response to microcantilever deflection. A differential splitter using an amorphous silicon strip-loaded multimode rib waveguide is designed and fabricated to demonstrate the feasibility of the in-plane photonic transduction method. Our initial …

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You Don't Know Jack: The Dynamics Of Mormon Religious/Ethnic Identity, Michael R. Cope Nov 2009

You Don't Know Jack: The Dynamics Of Mormon Religious/Ethnic Identity, Michael R. Cope

Theses and Dissertations

For much of human existence identity was ascribed based on the group one was born into. In such cultures all aspects of social life were fused into one incontrovertible identity: group identity. However as modern mindsets took root individuals began to shift the foundation of meaning and identity away from the fixed focal point of the group to one of personal preference. In response to this modern trend many groups began to intensify the maintenance of group identity as paramount in the lives of group members. Hammond and Warner (1993) assert that a powerful mechanism for sustaining group identity is …

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Synthesis And Evaluation Of N6,5'-Bis-Ureido-5'-Amino-5'-Deoxyadenosine Derivatives: Novel Nucleosides With Antiproliferative And Protein Kinase Binding Activities, Marcelio Oliveira Nov 2009

Synthesis And Evaluation Of N6,5'-Bis-Ureido-5'-Amino-5'-Deoxyadenosine Derivatives: Novel Nucleosides With Antiproliferative And Protein Kinase Binding Activities, Marcelio Oliveira

Theses and Dissertations

A new series of N6,5'-bis-ureido-5'-amino-5'-deoxyadenosine derivatives was prepared and evaluated for anticancer activities using the NCI 60 panel of human cancers. Certain of the derivatives showed promising activities (low micromolar GI50's) against several of the representative cancers. These included cell lines from the following general cell types in the NCI 60: Leukemia, Breast, Central Nervous System, Non-Small Cell Lung, Ovarian, Prostate, Renal, and Colon cancers. Select compounds were also screened for their affinities for protein kinases. The synthesis of the compounds was straightforward and involved N6 acylation with arylisocyanates, preceded by activation and nucleophilic substitution of the 5'-position to give …

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