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Articles 6661 - 6690 of 10986
Full-Text Articles in Entire DC Network
Field Guide To The Sedges Of The Pacific Northwest By B.L. Wilson, R.E. Brainerd, D. Lytjen, B. Newhouse, And N. Otting, Frank A. Lang, Cindy Roché
Field Guide To The Sedges Of The Pacific Northwest By B.L. Wilson, R.E. Brainerd, D. Lytjen, B. Newhouse, And N. Otting, Frank A. Lang, Cindy Roché
Western North American Naturalist
No abstract provided.
Ectoparasites Of The Occult Bat, Myotis Occultus (Chiroptera: Vespertilionidae), Ernest W. Valdez, Christopher M. Ritzi, John O. Whitaker Jr.
Ectoparasites Of The Occult Bat, Myotis Occultus (Chiroptera: Vespertilionidae), Ernest W. Valdez, Christopher M. Ritzi, John O. Whitaker Jr.
Western North American Naturalist
Only a single previous study has examined ectoparasites of the occult bat (Myotis occultus), from which only 2 species of fleas were identified. For our study, we examined 202 individuals, 52 fresh hosts and 150 museum specimens, from New Mexico and southern Colorado for ectoparasites. We recorded 2158 ectoparasites, 634 from fresh hosts and 1524 from museum specimens. Ectoparasites belonged to 10 families and 13 genera of insect or acari and represent new host and locality records. In general, ectoparasites collected from fresh hosts and museum specimens were represented by 4 major species of mite: Macronyssus crosbyi, Alabidocarpus …
Karyotypes Of The Long-Tailed Vole (Microtus Longicaudus) In Isolated Mountain Ranges Of The American Southwest, Jennifer K. Frey, Benjamin J. Frey, Dwight W. Moore
Karyotypes Of The Long-Tailed Vole (Microtus Longicaudus) In Isolated Mountain Ranges Of The American Southwest, Jennifer K. Frey, Benjamin J. Frey, Dwight W. Moore
Western North American Naturalist
The long-tailed vole (Microtus longicaudus) exhibits karyotypic variation in western North America. In the American Southwest, the species has a disjunct, relict distribution. However, karyotypes obtained from 20 specimens in 5 isolated mountain ranges (White Mountains, Arizona; Mount Taylor and the Sangre de Cristo, Jemez, and Mogollon mountains, New Mexico) exhibited no variation. These and previously reported karyotypes from the region had a diploid number (2n) of 56 and fundamental number (FN) of 84, which is the most commonly reported karyotype for the species.
A Histological Study Of The Primary Gonadal Tissue Of An Antlerless Buck Mule Deer (Odocoileus Hemionus), Richard Heckmann
A Histological Study Of The Primary Gonadal Tissue Of An Antlerless Buck Mule Deer (Odocoileus Hemionus), Richard Heckmann
Western North American Naturalist
An antlerless mule deer (Odocoileus hemionus) was collected on 2 December 1992 from an established Oak Creek mule deer herd 2 miles north of Oak City, Utah (Utah Wildlife Receipt #027604). Upon examination, the animal had prominent male genitalia with hair rubbed off from the pedicle part of the skull. Tissue examination revealed active spermatogenesis and viable sperm in the lumen of the epididymis and testis. Antlerless male deer have been reported previously in this area, but this is the first histological study of the abnormal deer. Lack of antlers would be advantageous for male deer during the …
Reproductive Traits In The Northern Scorpion (Paruroctonus Boreus), James N. Barron, Amy L. Weidlich
Reproductive Traits In The Northern Scorpion (Paruroctonus Boreus), James N. Barron, Amy L. Weidlich
Western North American Naturalist
Despite its large geographic range, little is known about reproductive traits in the northern scorpion (Paruroctonus boreus). We analyzed reproductive traits for 36 females from a population near Billings, Montana. All data were collected within a single year. Litter size, offspring mass, total litter mass (TLM), and relative litter mass (RLM) were within the ranges of values reported for other species in the Vaejovidae. Female size (length or mass) was not correlated with any reproductive trait. Litter size and offspring mass were each positively correlated with RLM, suggesting that females investing relatively larger amounts of energy in reproduction …
The Effects Of Varied Densities On The Growth And Emigration Of Adult Cutthroat Trout And Brook Trout In Fenced Stream Enclosures, David J. Buys, Robert H. Hilderbrand, Jeffrey L. Kershner
The Effects Of Varied Densities On The Growth And Emigration Of Adult Cutthroat Trout And Brook Trout In Fenced Stream Enclosures, David J. Buys, Robert H. Hilderbrand, Jeffrey L. Kershner
Western North American Naturalist
We evaluated the effects of various density treatments on adult fish growth and emigration rates between Bonneville cutthroat trout Oncorhynchus clarki utah and brook trout Salvelinus fontinalis in stream enclosures in Beaver Creek, Idaho. We used 3 density treatments (low, ambient, and high fish densities) to evaluate density-related effects and to ensure a response. Intraspecific ambient-density tests using cutthroat trout only were also performed. Results indicated an absence of cage effects in the stream enclosures and no differences in fish growth between ambient-density stream-enclosure fish and free-range fish. Brook trout outgrew and moved less than cutthroat trout in the stream …
Reserves, Jason Torfin
Why Population Pressure And Militant Religion Are The Most Important Causes Of The Developing Global Crisis, Michael Andregg
Why Population Pressure And Militant Religion Are The Most Important Causes Of The Developing Global Crisis, Michael Andregg
Comparative Civilizations Review
No abstract provided.
The Aristocratic Warlike Ethos Of Indo-Europeans And The Primordial Origins Of Western Civilization—Part Two, Ricardo Duchesne
The Aristocratic Warlike Ethos Of Indo-Europeans And The Primordial Origins Of Western Civilization—Part Two, Ricardo Duchesne
Comparative Civilizations Review
No abstract provided.
Ojs At Byu, C. Jeffrey Belliston
Ojs At Byu, C. Jeffrey Belliston
Faculty Publications
A number of years ago, the library began hosting the digitized back files of several campus-based journal publications in CONTENTdm. A little over two years ago, Mark Belk, the editor of the Western North American Naturalist whose backfile we were hosting, approached Randy Olsen, our University Librarian with a problem. Mark explained that in his role as editor he was drowning in e-mails and things were falling through the cracks. Randy tasked me to investigate options. This investigation was made considerably easier by work done by Mark Czyzk from Johns Hopkins. The investigation led to the selection of OJS as …
Pore Size Characterization Of Monolithic Capillary Columns Using Capillary Flow Porometry, Yan Fang
Pore Size Characterization Of Monolithic Capillary Columns Using Capillary Flow Porometry, Yan Fang
Theses and Dissertations
A simple capillary flow porometer (CFP) was assembled for pore structure characterization of monolithic capillary liquid chromatography columns based on ASTM standard F316-86. Determination of differential pressures and flow rates through dry and wet samples provided the necessary information to determine the through-pore throat diameter, bubble point pore diameter, mean flow pore diameter, and pore distribution. Unlike measurements in bulk using traditional techniques to provide indirect information about the pore properties of monolithic columns, monoliths can be characterized in their original chromatographic forms with this system. The performance of the new CFP was first evaluated by characterizing the pore size …
Gas Phase Chiral Recognition, Characterization Of Porous Polymer Monolith Nanospray Ionization, And The Negative Mode Crafti Method Using Fourier Transform Ion Cyclotron Resonance Mass Spectrometry, Nannan Fang
Theses and Dissertations
Our group has been studying chiral recognition in gas phase using mass spectrometry for more than 10 years. We are interested in gas phase studies of fundamental interactions because the gas phase avoids complications and masking effects that may arise upon solvation. Therefore, the results of gas phase experiments can be directly compared with those of high-level computational studies. In chapter 2, I studied the roles of hydrogen bonding and pi stacking in gas phase chiral recognition between aromatic crown molecules and aromatic amines. High affinity between host and guest doesn't necessarily result in better recognition. If the affinity is …
Medical Terms Used By Saints In Nauvoo And Winter Quarters, 1839-48, Douglas C. Heiner, Evan L. Ivie, Teresa Lovell Whitehead
Medical Terms Used By Saints In Nauvoo And Winter Quarters, 1839-48, Douglas C. Heiner, Evan L. Ivie, Teresa Lovell Whitehead
Religious Educator: Perspectives on the Restored Gospel
No abstract provided.
Performance Flight Testing Of Small Electric Powered Unmanned Aerial Vehicles, Jon N. Ostler, W. Jerry Bowman, Deryl O. Snyder, Timothy W. Mclain
Performance Flight Testing Of Small Electric Powered Unmanned Aerial Vehicles, Jon N. Ostler, W. Jerry Bowman, Deryl O. Snyder, Timothy W. Mclain
Faculty Publications
Flight testing methods are developed to find the drag polar for small unmanned aerial vehicles powered by electric motors with fixed-pitch propellers. Wind tunnel testing was used to characterize the propeller-motor efficiency. The drag polar was constructed using data from flight tests. This drag polar was then used to find the following performance parameters: maximum velocity, minimum velocity, velocity for maximum range, velocity for maximum endurance, maximum rate of climb, maximum climb angle, minimum turn radius, maximum turn rate, and maximum bank angle. The developed flight testing methods are used to characterize the performance of a small UAV.
Identification And Manipulation Of Resistance To Tomato Spotted Wilt Virus Derived From Solanum Peruvianum, Luis F. Gordillo Jr.
Identification And Manipulation Of Resistance To Tomato Spotted Wilt Virus Derived From Solanum Peruvianum, Luis F. Gordillo Jr.
Theses and Dissertations
The domesticated tomato Solanum lycopersicum (L.), formerly known as Lycopersicon esculentum is a genetically well-studied crop species with high-density linkage and molecular maps based on crosses done between cultivated tomato and its distant related wild species. Wild tomato species harbor a wealth of resistance to many pathogens that have been introgressed into domesticated tomato for genetic control of diseases and pests and for improvement of many agronomic traits. The wild tomato S. peruvianum (L.) is the source of the Sw-5 gene, characterized and mapped to chromosome 9 of the tomato genome and introgressed into elite tomato germplasm, providing resistance to …
Total Synthesis Of (-)-Acutumine, Fang Li
Total Synthesis Of (-)-Acutumine, Fang Li
Theses and Dissertations
Acutumine is a tetracyclic alkaloid isolated from the Asian vine Menispermum dauricum with selective T-cell cytotoxicity and antiamnestic properties. We have developed a total synthetic route to this congested alkaloid, during which we also found a novel, stereoselective radical-crossover reaction that combines an intramolecular radical conjugate addition with a subsequent enolate hydroxylation. Key features of this synthesis also include a reagent-controlled diastereoselective ketone allylation, an anionic oxy-Cope rearrangement to form a congested quaternary sterocenter, a pyridine-mediated selective ozonolysis, and a Lewis acid promoted Michael-type cyclization.
Development Of Biocompatible Polymer Monoliths For The Analysis Of Proteins And Peptides, Yun Li
Development Of Biocompatible Polymer Monoliths For The Analysis Of Proteins And Peptides, Yun Li
Theses and Dissertations
Biocompatibility is an important issue for the development of chromatographic stationary phases for the analysis of biomolecules (including proteins and peptides). A biocompatible stationary phase material is a material that resists nonspecific adsorption of biomolecules and does not interact with them in a way that would alter or destroy their structures or biochemical functions. The monolithic column format is a good alternative to typical spherical particle packed columns for capillary liquid chromatography of biomacromolecules. Several novel anion-exchange polymer monoliths for the analysis of proteins were synthesized for improved biocompatibility. Two novel polymeric monoliths were prepared in a single step by …
Real-Time Virus Analysis Via Image Charge Detection Surface Induced Dissociation Tandem Mass Spectrometry, Seth T. Call
Real-Time Virus Analysis Via Image Charge Detection Surface Induced Dissociation Tandem Mass Spectrometry, Seth T. Call
Theses and Dissertations
This thesis reports on the development of a novel mass spectrometer combining image charge detection with surface induced dissociation for real-time analysis of intact viruses. Protonated viruses produced using electrospray are accelerated and subsequently impact on a solid surface. Capsid peptides released during the impact are analyzed using time-of-flight mass spectrometry. Image charge detection is used to measure the mass and charge states of structurally intact, electrosprayed viruses prior to impact. Since virus capsids are composed of loosely-bound proteins, collision of viruses with surfaces at moderate impact energies could release intact proteins. The masses and numbers of different protein types …
Design And Characterization Of A Human Exposure Chamber And Inversion Episodes In Salt Lake City, Utah In January/February Of 2009, Roman Yuri Kuprov
Design And Characterization Of A Human Exposure Chamber And Inversion Episodes In Salt Lake City, Utah In January/February Of 2009, Roman Yuri Kuprov
Theses and Dissertations
Research on health effects of particulate matter (PM) has been a very active area in the last two decades. One plausible mechanism by which exposure to PM affects human health includes modification of autonomic endothelium function. Decreased endothelium activity causes heightened risks of cardiovascular disease. A human exposure chamber designed to conduct experiments to quantify diminished function of endothelium from short term exposure to PM is described. The chamber consists of two stages for containment and pre-treatment of PM and exposure of human subjects. Concentrations of CO, CO2, NO, NO2, O3, and PM2.5, are monitored and controlled in the exposure …
Molecular And Cellular Mechanisms Whereby The Apical Ectodermal Ridge (Aer), Via Wnt5a, Mediates Directional Migration Of The Adjacent Mesenchyme During Vertebrate Limb Development, Kate E. Kmetzsch
Theses and Dissertations
The vertebrate embryonic limb is a key model in elucidating the genetic basis underlying the three dimensional morphogenesis of structures. Despite the wealth of insights that have been generated from this model, many long-standing questions remain. For example, it has been known for over 70 years that the apical ectodermal ridge (AER) of the embryonic limb is essential for distal outgrowth and patterning of the adjacent limb mesenchyme. The mechanisms whereby the AER does accomplish outgrowth and patterning are still poorly understood. We propose that secreted FGFs from the AER activate Wnt5a expression in gradient fashion, which in turn provides …
Stable Carbon Isotope Evidence Of Ancient Maya Agriculture At Tikal, Guatemala, Richard Lee Burnett
Stable Carbon Isotope Evidence Of Ancient Maya Agriculture At Tikal, Guatemala, Richard Lee Burnett
Theses and Dissertations
Stable carbon isotope analyses of the humin fraction of the soil organic matter were conducted on more than 160 soil profiles from Tikal, Guatemala. The profiles were collected from near areas associated with the earthworks of Tikal; an ancient ditch and parapet construction hypothesized to have formed ancient boundaries of the polity. In addition to the isotope analyses, the physical and chemical characteristics of the horizons were determined. Maize, a C4 plant, formed an integral part of the ancient Maya diet and is the only known C4 plant cultivated by the Maya. Prior to and subsequent to the ancient Maya …
Beyond Eden: Revising Myth, Revising Allegory In Steinbeck's "Big Book", Jeremy S. Leatham
Beyond Eden: Revising Myth, Revising Allegory In Steinbeck's "Big Book", Jeremy S. Leatham
Theses and Dissertations
Steinbeck's use of allegory in East of Eden has caused much critical resistance, but recent work in allegory theory offers ways of rereading the novel that help mediate much of this criticism. The approach to allegory forwarded here, which allows for multiple bodies of referents and fluidity between text and referents, empowers readers with greater autonomy and individual authorship. In the case of East of Eden such an approach moves the novel beyond a simple retelling of the Cain-Abel narrative to establish a flexible mythic framework for use in an ever-changing world. By challenging dualistic thinking, narrow vision, and cultural …
Critical Thinking And Analyzing Assumptions In Instructional Technology, Bruce William Gabbitas
Critical Thinking And Analyzing Assumptions In Instructional Technology, Bruce William Gabbitas
Theses and Dissertations
In the field of instructional technology critical thinking is valued both as a practice for those in the field and as a skill or habit to teach and measure. However, traditional conceptions of critical thinking are limited in their usefulness and restricted to particular kinds of thinking and reasoning. Conceptions of critical thinking in instructional technology are dominated by these traditional perspectives. Missing is a substantive dialogue on the nature of critical thinking. despite the fact that such dialogue is a part of critical thinking scholarship outside of instructional technology. One of the primary limitations of traditional critical thinking is …
The Effects Of Whole Body Vibration Platform Training On Hamstring Flexibility, Travis A. Epperson
The Effects Of Whole Body Vibration Platform Training On Hamstring Flexibility, Travis A. Epperson
Theses and Dissertations
Introduction: Very few studies have looked at the effect of vibration on flexibility, and no studies exist that have looked at stretching concurrently with whole body vibration (WBV) training. Therefore, the purpose of this study was to determine if whole-body-vibration training (WBV) done concurrently with static stretch (SV) is more effective than static stretching alone (SS), and to see if WBV training independently (SQ) improves hamstring flexibility without stretching. A secondary purpose of this study is to determine if retention of flexibility gains are maintained. Methods: Forty-four subjects (31 men, 13 women) completed this study (age 22.5 ± 1.8 years; …
Zyxin Regulates Epithelial-Mesenchymal Transition By Mediating Actin-Membrane Linkages At Cell-Cell Junctions, Liv Rebecca Sperry
Zyxin Regulates Epithelial-Mesenchymal Transition By Mediating Actin-Membrane Linkages At Cell-Cell Junctions, Liv Rebecca Sperry
Theses and Dissertations
Development is punctuated by morphogenetic rearrangements of epithelial tissues, including complete detachment of individual motile cells during epithelial-mesenchymal transition (EMT). Dramatic actin rearrangements occur as cell-cell junctions are dismantled and cells become independently motile during EMT. Characterizing dynamic actin rearrangements and identifying actin machinery driving these rearrangements is essential for understanding basic mechanisms of cell-cell junction remodeling; yet, neither the precise series of actin rearrangements at cell-cell junctions that accompany EMT, nor the machinery that controls actin rearrangement during EMT, have been identified. This work represents a detailed study of junctional actin reorganization in cells undergoing EMT, identifies actin regulatory …
Changes In Bone Mineral Density In Middle-Age Women According To Physical Activity Volume, Intensity, And Cardiorespiratory Fitness: A Six-Year Prospective Study, Neil R. Nokes
Theses and Dissertations
This study was conducted to determine if physical activity and cardiorespiratory fitness (CRF) at baseline influence the likelihood of gaining bone mineral density (BMD) at the hip and lumbar spine over 6 years. Another aim was to ascertain the effect of several potential confounding factors. In a prospective study of 244 women (baseline age range 35-45 years), physical activity volume (PAv) and intensity (PAi) were measured using accelerometers at baseline. CRF indexed by VO2max was estimated using a graded, maximal treadmill test at baseline. BMD was measured using DEXA. Risk ratios were used to show the likelihood of BMD gains …
Sexual Experience And Couple Formation Attitudes Among Emerging Adults, Brian J. Willoughby, Jason S. Carroll
Sexual Experience And Couple Formation Attitudes Among Emerging Adults, Brian J. Willoughby, Jason S. Carroll
Faculty Publications
In this study, we explore the relationship between attitudes toward both marriage and cohabitation and sexual experience during emerging adulthood. Results from 990 emerging adults indicated only moderate evidence that marital attitudes are related to sexual experience but strong evidence of a relationship between attitudes toward cohabitation and sexual experience. In particular, sexually active emerging adults were more likely to have positive attitudes toward cohabitation. Furthermore, it was found that both religiosity and dating status moderate the relationship between couple formation attitudes and sexual experience. For highly religious emerging adults, sexual activity was associated with higher endorsement of cohabitation; however, …
Promoting Social And Emotional Learning In Second Grade Students: A Study Of The Strong Start Curriculum, Paul Caldarella, Lynnette Christensen, Thomas J. Kramer, Kalli Kronmiller
Promoting Social And Emotional Learning In Second Grade Students: A Study Of The Strong Start Curriculum, Paul Caldarella, Lynnette Christensen, Thomas J. Kramer, Kalli Kronmiller
Faculty Publications
The promotion of social and emotional learning (SEL) in schools may help prevent emotional and behavioral problems of students. This study evaluated the effects of a SEL curriculum, Strong Start, on the social-emotional competence of 26 second grade students, using a quasi-experimental, non-equivalent control group design. Results revealed statistically significant and meaningful improvements in teacher ratings of students’ internalizing and peer-related prosocial behaviors, particularly for students at greater risk. Conversely, control group students experienced significant worsening of internalizing behaviors and decreased levels of peer-related prosocial behaviors. No changes were reported in externalizing behaviors for either group. Treatment integrity and social …