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Articles 1711 - 1740 of 4981
Full-Text Articles in Entire DC Network
Calibration Of Cr-39 Nuclear Track Detectors With Alpha-Particles And Protons For A Measurement Of Neutron Interactions With 7be And The Primordial 7li Problem, Emily E. Kading
Master's Theses
The Primordial Lithium problem of Big Bang Nucleosynthesis (BBN), a prediction of 7Li abundance which is considerably larger than observed, has important implications for the standard model of cosmology. Since 7Li is produced by the later decay of 7Be it is important to study the destruction of 7Be during the epoch of BBN, in order to examine possible reduction of the predicted abundance of 7Li, in particular the destruction of 7Be with neutrons. The high flux of 50 keV epithermal neutrons (1010 n/sec/cm2) produced by a Liquid Lithium (LiLiT) target at …
Utilization Of Phylogenetic Analysis Methods To Understand Deep Phylogeny, Jeffrey M. O'Brien
Utilization Of Phylogenetic Analysis Methods To Understand Deep Phylogeny, Jeffrey M. O'Brien
Master's Theses
This thesis describes two analyses conducted to learn more about the early evolution of life and characteristics of the last universal common ancestor (LUCA). In chapter one, tree metric analysis methods were employed to determine if protein families identified in a previous analysis should be attributed to LUCA. It was found that many of the protein families identified by the previous analysis were likely the result of methodological errors, and either should not be attributed to LUCA or do not represent the full scope of diversity within the given protein family. Chapter two presents data from an ATP synthase catalytic …
Proportional Suppression Of Nmda And Ampa Mediated Synaptic Responses In Layer 2/3 Pyramids From Rat Visual Cortex By Adenosine, Justin T. Ellenberg
Proportional Suppression Of Nmda And Ampa Mediated Synaptic Responses In Layer 2/3 Pyramids From Rat Visual Cortex By Adenosine, Justin T. Ellenberg
Master's Theses
Adenosine (ADO) is an abundant endogenous neuromodulator, with a generally suppressive effect on excitatory synaptic transmission. Previous research has shown that in different brain structures adenosine may have heterogeneous effects on the balance of N-methyl-D-aspartate (NMDA) receptor-mediated and non-NMDA receptor-mediated currents. In hippocampal pyramids, adenosine proportionally reduced the NMDA and non-NMDA mediated excitatory currents, whereas dopaminergic neurons in rat midbrain, adenosine preferentially reduced NMDA currents. It is known that in layer 2/3 pyramidal neurons of rat visual cortex, adenosine suppresses excitatory synaptic transmission. However, it remains unknown whether adenosine has the same effect on NMDA and AMPA-mediated currents. Here we …
Wetland Ecosystem Functions In A Changing Coastal Landscape: Effects Of Urban Runoff, Saltwater Intrusion, And Restoration, April A. Doroski
Wetland Ecosystem Functions In A Changing Coastal Landscape: Effects Of Urban Runoff, Saltwater Intrusion, And Restoration, April A. Doroski
Master's Theses
No abstract provided.
Hydrogel-Based Conductive Polymers For Nerve Regeneration, Scott R. Stratton
Hydrogel-Based Conductive Polymers For Nerve Regeneration, Scott R. Stratton
Master's Theses
No abstract provided.
Influence Of Multi-Scale Drivers On Stream Salamander Occupancy, Abundance, And Reproduction In An Exurban Landscape, Diana C. Macklem
Influence Of Multi-Scale Drivers On Stream Salamander Occupancy, Abundance, And Reproduction In An Exurban Landscape, Diana C. Macklem
Master's Theses
The number of city-dwelling humans currently exceeds half of the world’s population and is expected to increase in the future (Meyer et al. 2005; Barrett and Price 2014); however, urban development significantly alters the surrounding ecological community. Urbanization increases the amount of impervious surfaces on the landscape, fragments or destroys habitats, produces pollutants and nutrient contaminants, promotes the introduction and invasion of non-native species, increases disease transmission, and alters biotic communities (Allan 2004; Bar-Massada et al. 2014). The manifestation of urbanization in stream ecosystems is a number of consistent symptoms collectively known as urban stream syndrome (Walsh et al. 2005; …
Episodic And Semantic Memory Activation In Sentence Processing, Zachary Ekves
Episodic And Semantic Memory Activation In Sentence Processing, Zachary Ekves
Master's Theses
No abstract provided.
Competing Risk Analyses For African American And White Breast Cancer Patients, Amna Sarwar 4912423
Competing Risk Analyses For African American And White Breast Cancer Patients, Amna Sarwar 4912423
Master's Theses
No abstract provided.
Philosophers On The Fringe: Albert Schweitzer, Liberty Hyde Bailey, Aldo Leopold, And The Wrongful Polarization Of Environmentalist History 2017, Minnie A.M. Lauzon
Philosophers On The Fringe: Albert Schweitzer, Liberty Hyde Bailey, Aldo Leopold, And The Wrongful Polarization Of Environmentalist History 2017, Minnie A.M. Lauzon
Master's Theses
This thesis includes three articles (chapters) intending to encourage clarification of an area of environmental history that has not received adequate attention since the publication of Roderick Nash’s Wilderness and the American Mind. Since its publication in 1967, little research has been dedicated to understanding the scholarly or philosophical influence Albert Schweitzer and Liberty Hyde Bailey had on Aldo Leopold. Since my undertaking of this topic, I have established two primary goals. First, I want to provide clarification to environmentalists, academics, and the populace at large that environmentalism does not have to be bound by rules and convention, but can …
Do Pinnipeds Have Personality? Coding Harbor Seal (Phoca Vitulina) And California Sea Lion (Zalophus Californianus) Behavior Across Contexts, Amber J. De Vere
Do Pinnipeds Have Personality? Coding Harbor Seal (Phoca Vitulina) And California Sea Lion (Zalophus Californianus) Behavior Across Contexts, Amber J. De Vere
Master's Theses
Personality has now been studied in species as diverse as chimpanzees (King & Figueredo, 1997) and cuttlefish (Carere et al., 2015), but marine mammals remain vastly underrepresented in this area. A broad range of traits have been assessed only in the bottlenose dolphin (Highfilll & Kuczaj, 2007), while consistent individual differences in a few specific behaviors have been identified in grey seals (Robinson et al., 2015; Twiss & Franklin, 2010; Twiss, Culloch & Pomeroy, 2011; Twiss, Cairns, Culloch, Richards & Pomeroy, 2012). Furthermore, the context component of definitions of personality is not often assessed, despite evidence that animals may show …
Age, Growth, And Reproduction Of Vermilion Snapper (Rhomboplites Aurorubens) In The North-Central Gulf Of Mexico, Trevor Dalton Moncrief
Age, Growth, And Reproduction Of Vermilion Snapper (Rhomboplites Aurorubens) In The North-Central Gulf Of Mexico, Trevor Dalton Moncrief
Master's Theses
Vermilion Snapper is a commonly harvested species of reef fish in the northern Gulf of Mexico (GOM). It supports both a large commercial and popular recreational fishery, however knowledge of this fish’s life history is limited spatially. Non-linear curve fitting was used to estimate growth parameters and Akaike information criteria (AIC) was used to determine relative model fit. The 2-parameter von Bertalanffy growth function provided the best model fit and lowest AIC score. Histological examination indicated that Vermilion Snapper are batch spawners with asynchronous oocyte development. Additionally, 17% of Vermilion Snapper in the actively spawning phase containing 24 hour POF’s …
A Multi-Millennial Drought Reconstruction For West-Central New Mexico Using Rocky Mountain Juniper (Juniperus Scopulorum, Sarg.), Joshua S. Oliver
A Multi-Millennial Drought Reconstruction For West-Central New Mexico Using Rocky Mountain Juniper (Juniperus Scopulorum, Sarg.), Joshua S. Oliver
Master's Theses
A new multi-millennial tree-ring record from living and remnant Rocky Mountain juniper (Juniperus scopulorum, Sarg.) wood from Candelaria in west-central New Mexico is used to determine the temporal and spatial variability of scPDSI over the past two millennia (B.C. 492 to A.D. 2014). Our record indicates extreme drought events found within other hydroclimatic proxy records in the Colorado Plateau region spanning the time period (16th century and 2nd century megadroughts). By ranking the extreme drought events by magnitude, duration, intensity, and overall score, the most extreme drought events of this record are compared to drought events …
Does Personality Similarity In Bottlenose Dolphin Pairs Influence Dyadic Bond Characteristics?, Kelsey R. Moreno
Does Personality Similarity In Bottlenose Dolphin Pairs Influence Dyadic Bond Characteristics?, Kelsey R. Moreno
Master's Theses
Social structures are critical to the success of many species and have repercussions on health, well-being, and adaptation, yet little is known about the factors which shape these structures aside from ecology and life history strategies. Dyadic bonds are the basis of all social structures; however, mechanisms for formations of specific bonds or patterns in which individuals form which types of bonds have yet to be demonstrated. There is a variety of evidence indicating personality may be a factor in shaping bonds, but this relationship has not been explored with respect to bond components and is yet to be demonstrated …
Sparking A Dolphin's Curiosity: Individual Differences In Dolphins' Reactions To Surprising And Expectation-Violating Events, Malin Katarina Lilley
Sparking A Dolphin's Curiosity: Individual Differences In Dolphins' Reactions To Surprising And Expectation-Violating Events, Malin Katarina Lilley
Master's Theses
Non-scientific literature consistently describes dolphins as “curious animals,” but there has been little systematic research on curiosity in dolphins. Curiosity in humans and certain non-human animal species, including birds and non-human primates, has been studied by examining individual differences in exploration and reactions to novel stimuli. Additionally, research has explored how human infants and non-human animals react when an event violates their expectations. The present study explored dolphins’ reactions to spontaneously surprising and expectation-violating stimuli. The reactions of dolphins, 15 bottlenose (Tursiops truncatus) and 6 rough-toothed (Steno bredanensis), at Gulf World Marine Park were analyzed in …
Life History Of The Non-Native Invasive Red Lionfish (Pterois Volitans) In The Northern Gulf Of Mexico, Alexander Q. Fogg
Life History Of The Non-Native Invasive Red Lionfish (Pterois Volitans) In The Northern Gulf Of Mexico, Alexander Q. Fogg
Master's Theses
Invasive Red Lionfish (Pterois volitans) were first detected in the northern Gulf of Mexico (nGOM) in 2010 and since then their numbers have increased dramatically. From 2010 to 2015, more than 15,000 Red Lionfish were collected opportunistically from the nGOM for this study. Length and weight relationships differed significantly among ecoregions by sex and there was clear sexual dimorphism in size with males being larger and heavier. Red Lionfish age ranged from 0-4.5 years old and males achieved greater growth rate (K) and asymptotic maximum lengths (Linf) compared to females and these parameters were also different …
Grooming As An Agonistic Behavior In Garnett’S Small-Eared Bushbaby (Otolemur Garnettii), Jennie L. Christopher
Grooming As An Agonistic Behavior In Garnett’S Small-Eared Bushbaby (Otolemur Garnettii), Jennie L. Christopher
Master's Theses
Social behaviors are a necessary component of group living and interactions between organisms. To correctly assess social interactions, researchers must be able to observe behaviors and interpret their function based on the behavior or the behavioral context. In primate species, grooming is often used to assess affiliations between group members and the consensus has been to always interpret grooming as an affiliative behavior. However, a number of avian, rodent and feline species have been shown to groom conspecifics aggressively. These instances of aggressive grooming appear most often when individuals are required to maintain close proximity to one another, such as …
Characterization Of Andrenocortical Tissue Morphology, Histology, And Steroid Synthesis Among Finetooth (Carcharhinus Isodon), Blacktip (Carcharhinus Limbatus), Atlantic Sharpnose (Rhizoprionodon Terraenovae), And Bonnethead (Sphyrna Tiburo) Sharks, Danielle Elizabeth Bailey
Master's Theses
Adrenocortical (interrenal) tissue is composed of steroidogenic cells that produce corticosteroids involved in the stress response and hydromineral balance. Previous research characterizing the elasmobranch interrenal suggests that the number of interrenal bodies that produce the single primary corticosteroid, 1a-hydroxycorticosterone (1a-OHB), varies among species. However, potential species-specific differences in the amount of interrenal tissue and major steroid products produced have been understudied. To address this critical gap in our understanding of elasmobranch biology, this study examined interrenal morphology, cell structure, steroidogenic enzyme distribution (3bHSD), and steroid production in four shark species: Finetooth Carcharhinus isodon, Blacktip Carcharhinus limbatus, Atlantic Sharpnose …
Nick Fury, Will Smith, And Other Black Authority Figures Breaking The Racial Contract In Popular Films Of 2000-2015, Solai N. Wyman
Nick Fury, Will Smith, And Other Black Authority Figures Breaking The Racial Contract In Popular Films Of 2000-2015, Solai N. Wyman
Master's Theses
Film is arguably a model of reflection and reinforcement of cultural, social, and political values of audience members. Therefore, the images and messages displayed in films are of importance. In this study, film is analyzed in order to determine if Charles Mills’ racial contract is depicted in popular films of 2000-2015. The Racial Contract (1997) suggests that only some people, specifically white people, agree to form a state in which their absolute privileges in the political, economic, and social arenas are guaranteed by virtue of being white. This theory was used to understand the role of black people in American …
Towards A Better Understanding Of Zebrafish Sleep Behavior, Kanza Musarrat Khan
Towards A Better Understanding Of Zebrafish Sleep Behavior, Kanza Musarrat Khan
Master's Theses
Sleep serves many vital functions in humans, ranging from energy restoration to memory consolidation and information integration. Sleep deprivation is linked to worsened physiological states and psychological conditions. Zebrafish are an emerging model in neurobehavioral research and have recently demonstrated great utility in the study of sleep. This teleost species possesses several of the same neurotransmitter and neuropeptide systems that are involved in the regulation of sleep and waking rhythms in higher order mammals. Previous study of these animals has revealed a differential gene and proteomic expression following sleep deprivation through changes in environmental stimuli. The present study sought to …
The Effect Of Boat Type On Bottlenose Dolphin (Tursiops Trucatus) Behavior In The Mississippi Sound, Maria Zapetis
The Effect Of Boat Type On Bottlenose Dolphin (Tursiops Trucatus) Behavior In The Mississippi Sound, Maria Zapetis
Master's Theses
Increases in oceanic shipping are a global phenomenon, and a leading cause of concern for marine animal welfare. While it may be difficult to assess the effect of boat traffic on all species in all contexts, it is vital to report anthropogenic impacts where longitudinal data is available, and doubly so where a dearth of information exists. The purpose of this study is to describe how dolphin behavior changed in the presence of boats in the Mississippi Sound between 2006 and 2012, and more specifically, to detail how different boat types impacted dolphins’ behavioral states. This study is unique in …
Genetic Investigation Into The Diversity And Population Structure Of Penstemon Harringtonii (Harrington's Beardtongue), Nathen P. Redecker
Genetic Investigation Into The Diversity And Population Structure Of Penstemon Harringtonii (Harrington's Beardtongue), Nathen P. Redecker
Master's Theses
Penstemon harringtonii is an endemic Colorado species that is listed on Bureau of Land Management (BLM) State Director’s Sensitive Species List as well as on the U.S. Forest Service sensitive species list. Penstemon harringtonii is encountering threats from habitat destruction and fragmentation due to oil and gas exploration, livestock grazing and recreational activities. Penstemon harringtonii is scattered across six counties in north central Colorado. The populations split into three general areas, one around Eagle and north to Kremmling, from Glenwood Spring south to Aspen and around the community of Rifle. The disjunct nature of the species has raised questions related …
Potato Plant Gene Expression And Physiology During Three-Way Interactions With Mycorrhizal Fungi And Lepidopteran Larvae, Andrew P. Schoenherr
Potato Plant Gene Expression And Physiology During Three-Way Interactions With Mycorrhizal Fungi And Lepidopteran Larvae, Andrew P. Schoenherr
Master's Theses
Arbuscular mycorrhizal fungi (AMF) are integral components of ecosystems and form root associations with the majority of land plants (>80%). In these relationships, AMF provide essential nutrients to their hosts, primarily phosphorus, in exchange for photosynthates, which enhance plant growth and help plants overcome environmental stress. The below-ground interaction between plants and AMF can indirectly alter aboveground plant interactions with insect herbivores. Potatoes (Solanum tuberosum) which are considered one of the most important vegetable crops worldwide, naturally form symbioses with AMF. However, it is not well understood how the association between potatoes and AMF can potentially affect leaf-chewing insect …
Tripartite Relationships: A Model System For The Study Of Plant-Mycorrhizal Fungus-Aphid Interactions, Eric Rizzo
Tripartite Relationships: A Model System For The Study Of Plant-Mycorrhizal Fungus-Aphid Interactions, Eric Rizzo
Master's Theses
Arbuscular mycorrhizal fungi (AMF) are obligate biotrophs known for forming mutualistic associations with over 80% of terrestrial plant species. Plants forming symbiosis with AMF, in general, exhibit enhanced nutritional status as well as abiotic and biotic stress tolerance. In addition, plants benefit from mycorrhiza-induced resistance (MIR), which “primes” plant defenses, enabling a faster and stronger response against subsequent attacks by pathogens and insect herbivores. Nevertheless, MIR against insect herbivores is primarily dependent on the feeding guild of the attacking insect. Herbivory by leaf-chewing insects and generalist species on mycorrhizal plants often results in decreased insect weight gain and reproductive rates, …
Going With The Flow: Using Menstrual Education As A Tool For Empowering Post Pubescent Nepali Girls, Graceann L. Cadiz
Going With The Flow: Using Menstrual Education As A Tool For Empowering Post Pubescent Nepali Girls, Graceann L. Cadiz
Master's Theses
Global discourse and research evidence on the benefits of girl’s education show that prioritizing girl’s education is the most successful strategy of breaking the cycle of poverty, gender inequality, and overpopulation. Moreover, there is a growing interest in closing the gender gap in education, but there has been insufficient attention to the specific needs of girls experiencing menses or menarche within schooling environments. The beginning of menstruation represents a pivotal event in development of the adolescent girl but is under-recognized and deemed insignificant with a culture of silence present throughout the rest of their lives. While providing access to education …
Investigating Nucleostemin's Regulatory Role In Ribosome Biogenesis, Meghan F. Monroy
Investigating Nucleostemin's Regulatory Role In Ribosome Biogenesis, Meghan F. Monroy
Master's Theses
No abstract provided.
Probabilistic Roadmaps For Virtual Camera Pathing With Cinematographic Principles, Katherine Davis
Probabilistic Roadmaps For Virtual Camera Pathing With Cinematographic Principles, Katherine Davis
Master's Theses
As technology use increases in the world and inundates everyday life, the visual aspect of technology or computer graphics becomes increasingly important. This thesis presents a system for the automatic generation of virtual camera paths for fly-throughs of a digital scene. The sample scene used in this work is an underwater setting featuring a shipwreck model with other virtual underwater elements such as rocks, bubbles and caustics. The digital shipwreck model was reconstructed from an actual World War II shipwreck, resting off the coast of Malta. Video and sonar scans from an autonomous underwater vehicle were used in a photogrammetry …
Temperament In Baby Siblings Of Children With Autism Spectrum Disorder, Julia Chen
Temperament In Baby Siblings Of Children With Autism Spectrum Disorder, Julia Chen
Master's Theses
Objective: Temperament may be an important early behavioral risk marker for ASD. The current study aimed to investigate temperamental differences and stability of temperament in high-risk baby siblings with and without ASD in toddlerhood and preschool-age; understand the additional benefit of measuring temperament in predicting ASD, beyond measures of ASD symptomology and severity; and understand gender differences in the relationship between temperament and ASD. Methods: High-risk baby siblings of children with ASD were evaluated at approximate ages 2 and 4. Multiple regression was used to assess the relationship between diagnostic group (ASD, non-ASD), temperament at both time points, and gender. …
The Insulin-Like Growth Factor-1 (Igf1) System As A Potential Biomarker For Nutritional Status And Growth Rate In Pacific Rockfish (Sebastes Spp.), Nicole L. Hack
Master's Theses
Growth performance in vertebrates is regulated by environmental factors including the quality and quantity of food, which influences growth via endocrine pathways such as the growth hormone (GH) / insulin-like growth factor somatotropic axis. In several teleost fishes, circulating concentrations of insulin-like growth factor-1 (Igf1) correlate positively with growth rate, and it has been proposed that plasma Igf1 levels may serve as an indicator of growth variation for fisheries and aquaculture applications. Here, I tested whether plasma Igf1 concentrations might serve as an indicator of somatic growth in olive rockfish (Sebastes serranoides), one species among dozens of rockfishes …
Application Of Argon Plasma Technology To Hydrophobic And Hydrophilic Microdroplet Generation In Pdms Microfluidic Devices, Brennan P. Graham
Application Of Argon Plasma Technology To Hydrophobic And Hydrophilic Microdroplet Generation In Pdms Microfluidic Devices, Brennan P. Graham
Master's Theses
Abstract Application of Argon Plasma Technology to Hydrophobic and Hydrophilic Microdroplet Generation in PDMS Microfluidic Devices Brennan Graham Microfluidics has gained popularity over the last decade due to the ability to replace many large, expensive laboratory processes with small handheld chips with a higher throughput due to the small channel dimensions [1]. Droplet microfluidics is the field of fluid manipulation that takes advantage of two immiscible fluids to create droplets from the geometry of the microchannels. This project includes the design of a microfluidic device that applies the results of an argon plasma surface treatment to polydimethylsiloxane (PDMS) to successfully …
Mixed Signals: Examining Ethnic Affirmation As A Factor In The Discrimination-Depression Relationship With Multiracial And Monoracial Minority Adolescent Girls, Linda A. Oshin
Master's Theses
Multiracial adolescents are a growing segment of our population, but not much is known about their ethnic-racial identity development. The current study examined ethnic affirmation, a dimension of ethnic-racial identity, and race socialization and their influence in the relationship between perceived group discrimination and depressive symptoms among multiracial (n = 42) and monoracial minority Black (n = 29) and Latina (n = 95) adolescents (M=15.4 years). Results showed that there were no mean differences between multiracial and monoracial adolescents in ethnic affirmation, maternal race/ethnic socialization, or depressive symptoms. Multiracial adolescents reported significantly less perceived discrimination. …