Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Life Sciences (347)
- Medicine and Health Sciences (147)
- Social and Behavioral Sciences (122)
- Engineering (88)
- Physical Sciences and Mathematics (82)
-
- Animal Sciences (75)
- Arts and Humanities (73)
- Neuroscience and Neurobiology (65)
- Psychology (61)
- Ecology and Evolutionary Biology (46)
- Genetics and Genomics (40)
- Medical Sciences (40)
- Biochemistry, Biophysics, and Structural Biology (38)
- Diseases (38)
- Education (38)
- Environmental Sciences (36)
- Biology (34)
- Experimental Analysis of Behavior (32)
- Microbiology (31)
- Food Science (30)
- Biochemistry (28)
- Forest Sciences (26)
- Nutrition (26)
- Cell and Developmental Biology (25)
- Molecular and Cellular Neuroscience (25)
- Immunology and Infectious Disease (23)
- Pharmacology, Toxicology and Environmental Health (23)
- Physiology (23)
- Plant Sciences (23)
- Natural Resources and Conservation (22)
- Keyword
-
- Animal sciences (97)
- Ecology (75)
- Forestry (69)
- Molecular biology (60)
- Behavioral psychology (57)
-
- Animal Physiology (56)
- Aquatic sciences (54)
- Physiology (52)
- Nutrition (50)
- Pharmacology (49)
- Microbiology (48)
- Mechanical engineering (47)
- Neurosciences (43)
- Agricultural education (42)
- Experimental psychology (37)
- Cellular biology (35)
- Environmental science (34)
- Genetics (34)
- Electrical engineering (32)
- Environmental engineering (31)
- Toxicology (31)
- Clinical psychology (29)
- Biochemistry (27)
- Wildlife management (24)
- Computer science (23)
- Soil sciences (23)
- Immunology (22)
- Biomedical engineering (21)
- Natural resource management (20)
- Veterinary science (20)
- Publication Year
- File Type
Articles 1381 - 1410 of 2809
Full-Text Articles in Entire DC Network
Evaluating The Intra-Variability And Inter-Variability Of Fibers In Cotton T-Shirts Using Microspectrophotometry, Brianne Miller
Evaluating The Intra-Variability And Inter-Variability Of Fibers In Cotton T-Shirts Using Microspectrophotometry, Brianne Miller
Graduate Theses, Dissertations, and Problem Reports (ETD)
The objective of this study was to evaluate and compare the differentiation of cotton fibers by the means of intra-garment and inter-garment comparison while utilizing Microspectrophotometry. Five different colors of cotton fibers were used: gold, kelly green, orange, red and royal. Ten t-shirts of each color were used in this study. Phase I of this study involved using the CRAICRTM QDI QDS II(TM) Stereomicrospectrophotometer to produce a spectrum of the front, back, sleeve and armpit of the t-shirt. These sections were then compared to the color chips in the Munsell Book of Color by observing them with the naked eye. …
Spatial Relationship Between The Trichloroethylene Degrading Bacteria Dehalococcoides Sp., Sulfate Reducers And Archaea During Reductive Dechlorination, Pujya Wagle Gautam
Spatial Relationship Between The Trichloroethylene Degrading Bacteria Dehalococcoides Sp., Sulfate Reducers And Archaea During Reductive Dechlorination, Pujya Wagle Gautam
Graduate Theses, Dissertations, and Problem Reports (ETD)
Trichloroethylene (TCE) released to the environment is of great concern due to its toxicity and carcinogencity. The microorganisms involved in bioremediation of TCE such as methanogens (organisms within the domain Archaea), sulfate reducing bacteria (SRB) and Dehalococcoides sp. (DHC) are of particular interest in this study. Three different types of bench scale reactors were constructed to model different aquifer types such as sandy, silty and fractured bedrock aquifers (hereafter type 1, 2 or 3 reactors, respectively). This study evaluated the effect of TCE concentration in different types of reactors on the distribution of selected microorganisms with distance from the source …
Geographic Variation Of Song Within And Between Subspecies Of The Mangrove Warbler (Setophaga Petechia Castaneiceps And S. P. Rhizophorae), Taryn Tuncer
Graduate Theses, Dissertations, and Problem Reports (ETD)
Bird song characteristics are unique for each species, but songs are not identical among con-specific individuals and variations may occur at different geographic scales throughout a species distribution. Geographic song variation is common in many species, particularly in Passerines due to their song-learning behavior. Among Wood Warblers (Fam. Paruliade), The Yellow Warbler ( Setophaga petechia) is one of the most widespread and geographically diverse species. It is comprised by three groups of several subspecies which represent a great variety on morphological traits, mainly on plumage coloration. Variations on behavioral traits, such as songs, have also been found in this species. …
Rock Climbers In The New River Gorge: Attitudes Toward Management Actions And Trust Of Park Managers, Kathryn M. Mckenney
Rock Climbers In The New River Gorge: Attitudes Toward Management Actions And Trust Of Park Managers, Kathryn M. Mckenney
Graduate Theses, Dissertations, and Problem Reports (ETD)
The New River Gorge National River (NERI), managed by the National Park Service, is a popular destination for whitewater rafters, day hikers, and rock climbers. Located in central West Virginia, about 60 miles east of Charleston, NERI contains over 1700 climbing routes. This thesis is part of a larger study, funded by the National Park Service, which studied geologic, botanical, and recreational components to cliff resources in NERI. This thesis compared the low impact behaviors and management attitudes of hikers and rock climbers, and further segments rock climbers by climbing style, experience level, learning environment, and learning style. This thesis …
Energy Management Control For Multimode Microgrid Renewable Integration, Roopa Ramachandran
Energy Management Control For Multimode Microgrid Renewable Integration, Roopa Ramachandran
Graduate Theses, Dissertations, and Problem Reports (ETD)
The need for storing energy has grown in correlation with the need for renewable and distributed energy resources. Designing a storage unit system which complements the distributed generation is required for increased efficiency and reducing the burden on the utility grid. The energy storage model used in this thesis is the Li-ion battery which is efficient, has high energy density and has applications in field of electronics, transportation and electric power industry. The wind turbine generator, photovoltaic (PV) and the energy storage unit modeled in this work share a symbiotic relationship even though they are completely separate entities which can …
Skeletal Muscle Regeneration And The Role Of Sirtuin 1, Brian T. Bennett
Skeletal Muscle Regeneration And The Role Of Sirtuin 1, Brian T. Bennett
Graduate Theses, Dissertations, and Problem Reports (ETD)
The main objective of this master's thesis project was to elucidate the role of the deacetylase Sirtuin 1 (Sirt1) in skeletal muscle regeneration. We developed two specific aims to accomplish this task, which involved separate studies in order to study the effects of Sirt1 in multiple models of regeneration. The results from these studies may potentially lead to the development of novel therapies to treat various clinical conditions which require muscle regeneration.;Specific aim 1 utilized resveratrol, a Sirt1 activator, as a supplement to improve muscle regeneration following a period of disuse in aged animals. Aged Fisher 344 x Brown Norway …
A Study Of Determinants Of Coping In Childhood Cancer Survivors, Lea Helene Mallett
A Study Of Determinants Of Coping In Childhood Cancer Survivors, Lea Helene Mallett
Graduate Theses, Dissertations, and Problem Reports (ETD)
OBJECTIVES: The purposes of this research were to (1) determine the association between time since the completion of cancer treatment and the type of stressor (cancer-related versus non-cancer-related) identified; (2) determine whether the stressor identified (cancer-related or non-cancer-related) and strategies utilized to cope with that stressor change over time; (3) determine whether type of cancer and treatment are associated with specific coping strategies, and (4) determine if family characteristics (household structure, median household income, and presence of siblings) impact the endorsement and efficacy of coping strategies utilized to cope with a stressor.;BACKGROUND: Cancer alters children's lives in many ways, beginning …
Effect Of Electron Beam Radiation On Microbial Inactivation, Radio-Resistance And Nutritional Quality Of Food, Adiam Tsegai Tesfai
Effect Of Electron Beam Radiation On Microbial Inactivation, Radio-Resistance And Nutritional Quality Of Food, Adiam Tsegai Tesfai
Graduate Theses, Dissertations, and Problem Reports (ETD)
A non-thermal food processing method, Electron beam radiation efficiently inactivates foodborne pathogens. However, foodborne pathogens may develop resistance in response to sublethal stresses. Thus it is important to study the response of food microorganisms to e-beam and understand the mechanism underlying their survival abilities. The overall objective of this study was to examine the inactivation of foodborne microorganisms by electron beam radiation at sublethal levels, understand the radio-resistance development to this processing method and also to determine the effects of e-beam on chemical changes of nutrients in infant formula.;Four independent studies are included in this dissertation, in the first study, …
Application Of Liquid Chromatography - Tandem Mass Spectrometry Techniques To Forensic, Environmental And Clinical Analyses., Lucy Sian Oldfield
Application Of Liquid Chromatography - Tandem Mass Spectrometry Techniques To Forensic, Environmental And Clinical Analyses., Lucy Sian Oldfield
Graduate Theses, Dissertations, and Problem Reports (ETD)
Liquid chromatography - tandem mass spectrometry (LC-MS/MS) is a powerful technique offering superior selectivity, sensitivity and flexibility for a diverse range of applications. This document describes the application of LC-MS/MS to analytical problems in environmental, clinical and forensic fields. LC-UV and LC-MS/MS methods were implemented and compared for the analysis of nitroaromatics, nitramines and nitrate esters in soil. Analysis of soils collected at detonation sites showed the presence and concentration of contaminants to be a function of parameters such as: time since detonation, type of charge employed, nature of detonation and size of charge used. Multi-increment (MI) sampling strategies recommended …
Effects Of Varying Levels Of Caclium Lignosulfonate, Mixer-Added Fat And Feed Form On Feed Manufacture And Broiler Performance, Alina M. Corey
Effects Of Varying Levels Of Caclium Lignosulfonate, Mixer-Added Fat And Feed Form On Feed Manufacture And Broiler Performance, Alina M. Corey
Graduate Theses, Dissertations, and Problem Reports (ETD)
Feed manufacture accounts for approximately 60--70% of the costs required for commercial broiler chicken production. Increased costs resulting from manufacturing high quality pellets can be problematic for commercial poultry production. However, these costs can be justified by improved broiler performance attributed to high quality pellets. In Experiment 1 pellets were manufactured by utilizing varying levels of a commercial Calcium lignosulfonate (CaLS) pellet binder inclusion (0, 0.5, or 1%), mixer-added fat (MAF) (1 or 3%), and feed form (pellet or ground pellet) in order to create 12 dietary treatments. In Experiment 2 diets were fed and broiler performance and digesta viscosity …
Characterizing Runoff Responses In A Mountaintop Mine Impacted And Forested Catchment In The Coalfields Of West Virginia, Andrew J. Miller
Characterizing Runoff Responses In A Mountaintop Mine Impacted And Forested Catchment In The Coalfields Of West Virginia, Andrew J. Miller
Graduate Theses, Dissertations, and Problem Reports (ETD)
Mountaintop mining (MTM) represents the largest land cover/landuse change in the Central Appalachian region. By 2012, the U.S. EPA estimates that MTR will have impacted approximately 6.8% of the predominately forested Appalachian Coalfield region of West Virginia (WV), Kentucky, Tennessee, and Virginia with nearly 4,000 miles of headwater streams buried under valley fills (VF). In spite of the scale and extent of MTM, its hydrologic impacts are poorly understood. Several devastating floods in the region have been attributed to MTM, but there is little evidence to either confirm or refute this belief. Existing research on the hydrologic impacts of MTM …
Monumento Piece For Symphonic Orchestra, 8'30", Rafael Langoni Smith
Monumento Piece For Symphonic Orchestra, 8'30", Rafael Langoni Smith
Graduate Theses, Dissertations, and Problem Reports (ETD)
Monumento is a piece for symphonic orchestra finished in November, 2012 under the guidance of Dr. John Oliver Beall. It asks for piccolo, 2 C flutes, 2 oboes---with the second oboe player doubling on English Horn---2 clarinets in B-flat, 2 bassoons; 4 horns in F, 3 trumpets in C, 3 trombones, tuba; 4 timpani, first percussionist with snare and tenor drums, second percussionist with bass drum, triangle, large gong and suspended cymbals; strings. Monumento has an approximate duration of 8 minutes and thirty seconds.
A Survey Of Journalism Schools' Online Publication Of Student Content, Sarah E. Moore
A Survey Of Journalism Schools' Online Publication Of Student Content, Sarah E. Moore
Graduate Theses, Dissertations, and Problem Reports (ETD)
Journalism in the digital age has changed dramatically as the needs and demands of journalism consumers have changed. In turn, the institutions preparing journalists to enter the field must adapt their methods. How can a school of journalism effectively integrate the web into their daily practices and equip students for post-graduation employment through the publication of an online magazine? This paper explores the broadly divergent methods and philosophies of three journalism schools and offers suggestions for schools developing their own online publication based on these observations.
Evaluating Biodegradable Containers As Alternatives To Plastic Pots, Renee L. Conneway
Evaluating Biodegradable Containers As Alternatives To Plastic Pots, Renee L. Conneway
Graduate Theses, Dissertations, and Problem Reports (ETD)
Marked improvements in the sustainability of the horticulture industry have occurred over the last few decades. Movement towards better management practices in areas such as pesticide (IPM), fertilizer application and water usage characterizes today's industry. However, several obstacles have to be overcome for true long-term sustainability of the ornamental horticulture industry. One of these obstacles is the abundant use of plastics in the horticulture industry. This research focused on reducing the industry's plastic waste stream by evaluating the effects of biodegradable pots on plant growth parameters and substrate chemistry, as well as characteristics of biodegradable pots such as strength and …
The Association Of Urinary Polycyclic Aromatic Hydrocarbons Biomarkers And Markers Of Inflammation, Diabetes Mellitus And Cardiovascular Disease, Omayma Alshaarawy
The Association Of Urinary Polycyclic Aromatic Hydrocarbons Biomarkers And Markers Of Inflammation, Diabetes Mellitus And Cardiovascular Disease, Omayma Alshaarawy
Graduate Theses, Dissertations, and Problem Reports (ETD)
Polycyclic aromatic hydrocarbons are potent atmospheric pollutants, released into air during incomplete combustion of fuel, industrial or domestic coal, wood, cigarette smoke and other organic materials. In addition to being carcinogenic, several animal studies have reported positive associations between polycyclic aromatic hydrocarbons and inflammation, oxidative stress and the development and progression of atherosclerosis. Occupational studies have reported positive associations between polycyclic aromatic hydrocarbons and cardiovascular morbidity and mortality. Moreover, there is evidence that polycyclic aromatic hydrocarbons may cause disruption of the endocrine system. It is still not clear if lower background exposure to polycyclic aromatic hydrocarbons, independent of the adverse …
The Effects Of Student Behavior Alteration Techniques On Student Motives To Communicate, Student Talk, And Student Learning, Christopher J. Claus
The Effects Of Student Behavior Alteration Techniques On Student Motives To Communicate, Student Talk, And Student Learning, Christopher J. Claus
Graduate Theses, Dissertations, and Problem Reports (ETD)
This dissertation addressed the effects of students' perceived effectiveness of and likelihood to use student behavior alteration techniques (BATs) on students' motives to communicate with their instructors, student talk (i.e., willingness to talk, out-of-class communication), and student learning (i.e., cognitive learning, affective learning, state motivation, and student communication satisfaction). Results revealed that student perceived effectiveness of, and likelihood to use, student BATs did not influence, student talk or student learning, but indicated some significant relationships with the students' motives to communicate with their instructors. Specifically, the relational, functional, participatory, and sycophancy motives were generally related to the perceived likelihood to …
The Inhibition Of Splicing Of Glucose-6-Phosphate Dehydrogenase Mrna During Starvation By Heterogeneous Nuclear Ribonucleoprotein K, Travis Cyphert
The Inhibition Of Splicing Of Glucose-6-Phosphate Dehydrogenase Mrna During Starvation By Heterogeneous Nuclear Ribonucleoprotein K, Travis Cyphert
Graduate Theses, Dissertations, and Problem Reports (ETD)
Splicing of nascent RNA transcripts is an essential step in gene expression and a target of nutrient regulation. Glucose-6-phosphate dehydrogenase (G6PD) is a lipogenic gene whose expression is regulated exclusively at this posttranscriptional stage. Expression of G6PD mRNA increases 15- to 17-fold during refeeding and is inhibited 80-90% by starvation and the addition of polyunsaturated fat to the diet. The large changes in the accumulation of G6PD mRNA are due to changes the rate of pre-mRNA splicing and not changes in its transcription. In this regard, dietary carbohydrate enhances intron removal, which increases the accumulation of G6PD mRNA. Starvation alters …
Characterization Of Immune Responses To Repeated Aspergillus Fumigatus Exposures, Amanda Dawn Buskirk
Characterization Of Immune Responses To Repeated Aspergillus Fumigatus Exposures, Amanda Dawn Buskirk
Graduate Theses, Dissertations, and Problem Reports (ETD)
Personal exposures to A. fumigatus are associated with a variety of adverse health outcomes, including invasive aspergillosis, allergic sensitization, and asthma. Due to the high rate of mortality associated with invasive disease in immunocompromised patients, most studies of A. fumigatus have aimed to characterize the immune responses in immunocompromised murine models. However, a larger portion of the population is affected by fungal-induced allergies and asthma and the immune mechanisms associated with exposure have rarely been studied in an immunocompetent model. These models do not accurately reflect the natural method of exposure to environmental sources of conidia, and may significantly impact …
Selling 'Fracking': Legitimation Of High Speed Oil And Gas Extraction In The Marcellus Shale Region, Jacob R. Matz
Selling 'Fracking': Legitimation Of High Speed Oil And Gas Extraction In The Marcellus Shale Region, Jacob R. Matz
Graduate Theses, Dissertations, and Problem Reports (ETD)
The advent of horizontal hydraulic fracture drilling, or 'fracking,' a technology used to access oil and natural gas deposits, has allowed for the extraction of deep, unconventional shale gas and oil deposits in various shale seams throughout the United States and world. One such shale seam, the Marcellus shale, extends from New York State, across Pennsylvania, and throughout West Virginia, where shale gas development has significantly increased within the last decade. This boom has created a massive amount of economic activity surrounding the energy industry, creating jobs for workers, income from leases and royalties for landowners, and profits for energy …
The Diabetic Heart: Examination Of The Inner Mitochondrial Membrane, Tara Lyne Slider Croston
The Diabetic Heart: Examination Of The Inner Mitochondrial Membrane, Tara Lyne Slider Croston
Graduate Theses, Dissertations, and Problem Reports (ETD)
Cardiovascular complications, such as diabetic cardiomyopathy, are the primary cause of morbidity and mortality in patients with diabetes mellitus. The hyperglycemic environment associated with diabetes mellitus has been shown to induce the mitochondrial dysfunction contributing to diabetic cardiomyopathy. The examination of mitochondrial function is further complicated by the existence of two spatially and functionally distinct cardiac mitochondrial subpopulations, the subsarcolemmal (SSM) interfibrillar (IFM) mitochondria. These two pools of mitochondria respond differently to pathologic stimuli, such as diabetes mellitus. Targeted by the deleterious effects of diabetes mellitus, the inner mitochondrial membrane (IMM) is composed of a specific lipid environment that houses …
Phase Transformations Of Microcrystalline Cellulose Under Ball-Milling And Hydrothermal Treatment, Sai Kishore Pyapalli
Phase Transformations Of Microcrystalline Cellulose Under Ball-Milling And Hydrothermal Treatment, Sai Kishore Pyapalli
Graduate Theses, Dissertations, and Problem Reports (ETD)
In this thesis, experimental results and their analysis are presented on the phase transformations of microcrystalline cellulose (MCC) under two different treatments. First, MCC was subjected to ball milling in air for different times tBMi = 5, 10, 15, 30, 45, 60 and 120 minutes. Second, phase transformation of MCC under hydrothermal treatment (HTT) in distilled water using an autoclave was investigated by varying the pressure P, temperature T for different time tau. Both of the post treated samples were analyzed by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR) Spectroscopy, surface area measurements, Scanning Electron Microscopy (SEM) and Thermo-gravimetric Analysis …
Temporal Expression Of Key Angioregulatory Proteins In Response To Exercise And Detraining, Sara A. Olenich
Temporal Expression Of Key Angioregulatory Proteins In Response To Exercise And Detraining, Sara A. Olenich
Graduate Theses, Dissertations, and Problem Reports (ETD)
Angiogenesis is an important adaptation to exercise, occurring in response to a multitude of different stimuli including: shear stress, mechanical stretch, ischemia, electrical stimulation, and exercise. Current thinking suggests skeletal muscle angiogenesis is a temporal process controlled by a balance between positive and negative angiogenic proteins. But there is limited information on what molecular mediators control skeletal muscle angiogenesis in this time line, creating a critical need to clarify how individual protein responses regulate physiologic skeletal muscle angiogenesis in response to exercise training and/or physical deconditioning. Our objective is to characterize the temporal expression of several key positive (VEGF, MMP-2, …
Adaptation Of Temporal Control To Unpredictable Mid-Session Changes In A Rapid-Acquisition Multiple Peak-Interval Procedure, Nathaniel Rice
Adaptation Of Temporal Control To Unpredictable Mid-Session Changes In A Rapid-Acquisition Multiple Peak-Interval Procedure, Nathaniel Rice
Graduate Theses, Dissertations, and Problem Reports (ETD)
The temporal arrangement of events is important in laboratory and real-world settings. Many real-world scenarios are highly dynamic and not reflected by the steady-state nature of experiments often conducted in laboratory settings. To address the dynamic nature of the environment, four pigeons responded on a rapid-acquisition multiple peak-interval schedule. Peak-interval trials, extinction trials that are extended and deliver no reinforcement, were interspersed with fixed-interval trials in a two-component multiple schedule. The interval for each component changed mid-session every session. There were two conditions: an Unsignaled condition where the intervals were changed mid-session without any accompanying stimulus change and a Signaled …
Predicting Deer Hunting Participation Using Theory Of Planned Behavior And Constraint Integrated Theory Of Planned Behavior Models: A Study Of Oregon Big Game Hunters, Suresh Kumar Shrestha
Predicting Deer Hunting Participation Using Theory Of Planned Behavior And Constraint Integrated Theory Of Planned Behavior Models: A Study Of Oregon Big Game Hunters, Suresh Kumar Shrestha
Graduate Theses, Dissertations, and Problem Reports (ETD)
Studies have established that the theory of planned behavior (TPB) is a simple but effective model for providing theoretical explanation as to why people participate in a given recreation activity, including general hunting activity. Understanding leisure constraints is another popular approach in leisure research, which is considered more useful from the practitioners' point of view. Literature suggested that significant relationships exist between constraint dimensions and constructs of theory of planned behavior. It was assumed that integrating constraints to TPB might not only enhance the predicting power of the TPB but might also provide a practical dimension to it. The aims …
Mode And Implementation Of A Hybrid Control System For A 2-Mode Hybrid Electric Vehicle, Zhenhua Zhu
Mode And Implementation Of A Hybrid Control System For A 2-Mode Hybrid Electric Vehicle, Zhenhua Zhu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Automotive transportation consumes more than 71% of the world's total petroleum energy. The vehicle will have to use less because it will take less than 30 years to consume the rest of the proven conventional oil reservoir if the fuel consumption keeps the current trend. One of the methods to improve the vehicle efficiency is to develop Hybrid Electric Vehicle (HEV). An HEV combines an internal combustion engine (ICE) and electric motor(s) powered by batteries or capacitors to achieve better fuel economy. Among the HEVs, 2-Mode HEV combines an ICE and two electric motors with two planetary gear sets and …
Microfluidic Impedance-Metric Biosensor For Monitoring Carbon Nanotube-Induced Epithelial Permeability, Zhouchun Huang
Microfluidic Impedance-Metric Biosensor For Monitoring Carbon Nanotube-Induced Epithelial Permeability, Zhouchun Huang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Carbon nanomaterials, including carbon nanotubes (CNTs) gain increasing interest in commercial and biomedical applications. Adverse health effects of engineered CNTs may result from either direct exposure during production, inadvertent exposure during use of by-products, and/or release of these materials into the environment. Recent studies have shown that CNTs can induce cytotoxicity, apoptosis, DNA damage, and tumor formation in animals, suggesting their potential toxicity in humans. To address the current needs in developing in vitro cell assays for assessment of the adverse health effects of CNTs in lung respiratory, we have developed a microfluidic impedance-metric biosensor for investigation of multi-walled CNTs …
A Comparison Of Responses And Exteroceptive Stimuli As Time Markers, Adam E. Fox
A Comparison Of Responses And Exteroceptive Stimuli As Time Markers, Adam E. Fox
Graduate Theses, Dissertations, and Problem Reports (ETD)
Time markers are events that are predictive of when future events will occur. Different events can serve as time markers that initiate intervals in schedules of reinforcement. Pigeons were exposed to fixed-interval (FI) schedules in which the onset of the interval was signaled by the illumination of a key light, initiated by a peck to a lighted key, or a combination of both events. In these variations of fixed-interval schedules, food was delivered contingent on the first response after the interval elapsed. In Experiment 1, three pigeons were exposed to a multiple schedule. One component was a standard FI schedule; …
Stress And Obesity: Facilitation Of Neuroendocrine And Autonomic Nervous System Recovery From Stress While Eating Comfort Foods?, Paula R. Prentice
Stress And Obesity: Facilitation Of Neuroendocrine And Autonomic Nervous System Recovery From Stress While Eating Comfort Foods?, Paula R. Prentice
Graduate Theses, Dissertations, and Problem Reports (ETD)
Obesity and dysfunctional eating are prevalent and costly concerns in the United States and throughout the world (CDC, 2007; Mathus-Vliegen et al., 2008). Research into the etiology of these conditions points to problems regulating eating, particularly during times of stress. The animal literature suggests that eating during and following stress may lead to a more immediate physiological recovery from stress (e.g., Bulwalkda et al., 2001; Pecoraro et al., 2004). The present study was designed to test this phenomenon in humans; that is, to determine if eating a favorite food immediately after stress would lead to enhanced physiological recovery from stress; …
Beef Heifer Growth And Reproductive Performance Responses Following Two Levels Of Fall Stockpiled Forage Allocation, Bobbi Lynn Bailey
Beef Heifer Growth And Reproductive Performance Responses Following Two Levels Of Fall Stockpiled Forage Allocation, Bobbi Lynn Bailey
Graduate Theses, Dissertations, and Problem Reports (ETD)
Recent research on heifer development systems has been conducted primarily in dry-lot settings and limited information exists comparing systems which utilize standing forage (Larson and Funston, 2011). Objectives of the research presented here include: 1) comparing heifer growth and reproductive performance in response to two levels of stockpiled fall forage allocation: daily herbage DM allocation of 3.5 (LO) or 7.0 (HI) % of BW; and 2) assessing the seasonal dynamics of forage quality, herbage mass, and botanical composition of naturalized pastures containing mixed cool-season species in response to two different fall stocking rates (HI vs LO). Treatments were replicated 3 …
Survival, Injury, And Antibiotic Resistance Patterns Of Cronobacter Sakazakii And Escherichia Coli Resulting From Exposure To Low-Temperature Ground Water, Alisha L. Dailey
Survival, Injury, And Antibiotic Resistance Patterns Of Cronobacter Sakazakii And Escherichia Coli Resulting From Exposure To Low-Temperature Ground Water, Alisha L. Dailey
Graduate Theses, Dissertations, and Problem Reports (ETD)
Bacteria are constantly being exposed to changing conditions in the environment. Exposure to adverse conditions such as pH, temperature, and desiccation may cause stress to the bacteria, potentially resulting in loss of viability and growth. Cronobacter sakazakii and Escherichia coli were exposed to cold temperature (4°C) and room temperature (24°C) nutrient-limiting groundwater. As a function of time (0 to 15 days), samples were removed from the stress and analyzed. Response of stressed cells was evaluated by three approaches: (i) traditional viable cell counts (nonselective and selective media), (ii) substrate utilization patterns (BIOLOG GN microplates), and (iii) antibiotic resistance patterns (modified …