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Factors Affecting Turnover As Perceived By County Agents Who Voluntarily Left The West Virginia University Extension Service, Michael B. Withrow
Factors Affecting Turnover As Perceived By County Agents Who Voluntarily Left The West Virginia University Extension Service, Michael B. Withrow
Graduate Theses, Dissertations, and Problem Reports (ETD)
This descriptive survey study sought to identify factors that influenced West Virginia University County Extension Agents to voluntarily leave the organization. The population consisted of 31 individuals who had left the Extension Service from 2009-2014. A survey which was composed of four main question sets was mailed to the identified population.;Questions focused on the constructs of organizational factors, job related factors, personal factors, and demographics. Data were collected and analyzed to identify contributing factors in each of the constructs. The study found that a major factor that contributes to agents leaving Extension was having other priorities in the individuals' life. …
Mapping And Modeling Soil Organic Carbon In The Eastern Allegheny Plateau And Mountains Using Legacy Data, Katey M. Yoast
Mapping And Modeling Soil Organic Carbon In The Eastern Allegheny Plateau And Mountains Using Legacy Data, Katey M. Yoast
Graduate Theses, Dissertations, and Problem Reports (ETD)
The deeply dissected topography and diverse climate of the Eastern Allegheny Plateau and Mountains (Major Land Resource Area (MLRA) 127) create challenges for dynamicpedoecological modeling needed for ecosystem management adaptation to a changing climate. The spatial distribution of soil organic carbon (SOC), one of the most dynamic soil properties, has been previously estimated and mapped using the State Soil Geographical Database (STATSGO2) and the more detailed Soil Survey Geographic Database (SSURGO) for MLRA 127, estimating mean SOC to a depth of 1 m to be 2.60 and 4.40 kg m-2, respectively. Previous studies have shown that these approximations underestimate true …
Decellularized Matrix And Cartilage Regeneration: A Focus On Developing A Matrix With Anti-Inflammation And Micromechanical Properties, Ying Zhang
Graduate Theses, Dissertations, and Problem Reports (ETD)
Osteoarthritis (OA) is predicted to be the fourth leading cause of disability worldwide by the year 2020. Stem cell-based therapy is a promising biological approach for the treatment of cartilage defects. However, adult stem cells tend to become replicatively senescent when they are expanded on conventional plastic flasks. Decellularized extracellular matrix (dECM) provides an expansion system to rejuvenate and maintain the chondrogenic phenotype of stem cells for cartilage repair. In addition, joints with cartilage defects normally have inflammation to some extent; several stimuli, such as Reactive Oxygen Species (ROS) and Interleukin-1 (IL-1), reportedly induce apoptosis of chondrocytes. The tolerance of …
Cellulose Based Materials As A Template For The Synthesis Of Copper Nanoparticles For Antimicrobial Applications, Tuhua Zhong
Cellulose Based Materials As A Template For The Synthesis Of Copper Nanoparticles For Antimicrobial Applications, Tuhua Zhong
Graduate Theses, Dissertations, and Problem Reports (ETD)
Copper has been used as a broad-spectrum biocide for centuries, showing effective antimicrobial performance against bacteria, fungi and viruses. Among various forms of copper, copper nanoparticles is attracting particular attention because of its high surface area and crystal morphology that will enhance copper antimicrobial properties. However, the high tendency of copper particles to aggregate at a nanoscale remains as a drawback for the development of copper-based nanostructured products. In this research, cellulose-based materials were utilized as a template and stabilizer for copper nanoparticles, and the resulting hybrid material was used as bi-functional material in thermoplastic resins improving the final antimicrobial …
Optimization Of Pulsed-Vacuum Osmotic Dehydration Of Blueberries, Alexandra Marie Smith
Optimization Of Pulsed-Vacuum Osmotic Dehydration Of Blueberries, Alexandra Marie Smith
Graduate Theses, Dissertations, and Problem Reports (ETD)
Fruit drying is energy intensive (thermal efficiency 25-50%). However, improved efficiency is possible if phase change during the process is minimized. To minimize phase change and simultaneously increase product yield and quality, osmotic dehydration and pulsed-vacuum osmotic dehydration can be applied to maximize water removal before final drying. The objective of this study was to characterize the effect of vacuum, osmotic solution temperature and concentration, and treatment duration on blueberry mass transfer. Frozen blueberries were exposed to 2 temperatures (25 or 50°C), 2 sugar solution concentrations (45 or 65°Brix), 2 vacuum treatments (no vacuum or 50 mbar), and 3 duration …
Saprophytic Colonization And Sporulation Of Virulent And Hypovirulent Cryphonectria Parasitica On American Chestnut (Castanea Dentata) And Scarlet Oak (Quercus Coccinea), Eric Shelton Goddard
Saprophytic Colonization And Sporulation Of Virulent And Hypovirulent Cryphonectria Parasitica On American Chestnut (Castanea Dentata) And Scarlet Oak (Quercus Coccinea), Eric Shelton Goddard
Graduate Theses, Dissertations, and Problem Reports (ETD)
Colonization and sporulation (stroma production) of virulent (V) and hypovirulent (HV) Cryphonectria parasitica, were evaluated on two hosts to better understand the saprophytic stage of the fungus and its ability to produce HV inoculum. Both the V and HV C. parasitica strains were isolated from an existing chestnut orchard at the test site. Castanea dentata (American chestnut) and Quercus coccinea (scarlet oak) were used as test hosts. Sixty centimeter long stems of both species were cut from saplings and placed as pairs in three-layer, triangular stacks. Each stack was wound inoculated with either V, HV or water agar (control) inoculum. …
Discovery Of A Novel Oocyte-Specific Krab-Containing Zinc Finger Protein Required For Early Embryogenesis In Cattle, Jacqelyn M. Hand
Discovery Of A Novel Oocyte-Specific Krab-Containing Zinc Finger Protein Required For Early Embryogenesis In Cattle, Jacqelyn M. Hand
Graduate Theses, Dissertations, and Problem Reports (ETD)
Much of the loss of potential offspring in cattle is concentrated in the early embryonic period. Maternal mRNAs that accumulate in the oocyte during oogenesis have important functional roles during the initial stages of embryonic development, before embryonic genome activation. It is well regarded that the oocyte plays an active role in regulation of key aspects of the reproductive process required for fertility. What is more, oocyte-specific transcription factors seem to be the controlling feature influencing germ cell success throughout oogenesis, fertilization, and early embryonic development. Of the remarkably diverse array of transcription factors encoded by mammalian genomes, about two-thirds …
A Feasibility Analysis For The Development Of A Facility Utilizing Olive Oil Mill Production Waste As A Carbon Substrate In Polyhydroxyalkanoate Production In Morocco, Catherine Hansen
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis presents a market study and economic feasibility analysis on developing a facility utilizing olive oil production waste as a carbon substrate in polyhydroxyalkanoate production. Three underlying questions will be explored within this thesis: (1) Can olive oil mill effluents be utilized to produce an environmentally friendly polyhydroxyalkanoate bio-plastic?;, (2) Is there potential for the bio-plastic polyhydroxyalkanoate to enter Morocco's plastic market?;, (3) Is it likely that a bio-plastic facility utilizing olive oil mill production waste to create polyhydroxyalkanoate would have long term profitability? This research provides a pathway toward a new solution to a pervasive environmental concern facing …
The Assessment Of Instruments For Detecting Surface Water Spills And A Three-Dimensional Model Of The Elk River Spill, Aubrey E. Harris
The Assessment Of Instruments For Detecting Surface Water Spills And A Three-Dimensional Model Of The Elk River Spill, Aubrey E. Harris
Graduate Theses, Dissertations, and Problem Reports (ETD)
Source water protection has been an increasing area of concern due to the risks associated with chemical storage and oil and gas operations. To better identify and mitigate risk, models and tools are needed to evaluate the dispersion of pollutants in possible spill scenarios. This information may be used to determine the placement of in-stream water quality monitoring instruments and to develop early-warning systems and emergency plans.;In this work, two approaches of applying chemical dispersion models are described: one to determine the necessary concentration to generate a signal from in-stream measurements; and second to demonstrate, in a numerical three-dimensional model, …
Evaluation Of Age, Growth And Diet Of Channel Catfish (Ictalurus Punctatus) In Cheat Lake, West Virginia, Corbin D. Hilling
Evaluation Of Age, Growth And Diet Of Channel Catfish (Ictalurus Punctatus) In Cheat Lake, West Virginia, Corbin D. Hilling
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis describes population characteristics of Channel Catfish ( Ictalurus punctatus) in Cheat Lake, West Virginia in two chapters. The first chapter is comprised of a literature review on the ecology, diet and growth of Channel Catfish, as well as the influence of water level fluctuations on biota. The second chapter examines the age, growth and fall diet of Channel Catfish in Cheat Lake, West Virginia. Acidification has historically impaired Cheat Lake's fish community, but recent mitigation efforts within the Cheat River watershed have improved water quality and species richness. Presently, Channel Catfish are abundant and attain desirable sizes for …
Effects Of Protein Supplementation On Parasitism And Growth In Grazing Lambs, Crista Crawford
Effects Of Protein Supplementation On Parasitism And Growth In Grazing Lambs, Crista Crawford
Graduate Theses, Dissertations, and Problem Reports (ETD)
Controlling gastrointestinal nematode infection of sheep has become a challenge resulting from reduced anthelmintic efficacy. Previous data have indicated that grazing lambs supplemented with a 16% CP ration at 1% BW maintained growth comparable to lambs given anthelmintic despite greater infection. Thus the objective of the following studies was to determine the effects of bypass protein on fecal egg count reduction and post weaning growth in parasitized, grazing lambs. Experiment one utilized spring-born Suffolk crossbred lambs separated into 3 supplement groups: alfalfa pellets (AFP) (15% CP), corn and soybean meal (CSM) (19% CP) and corn, soybean meal and fish meal …
How Are The Dimensions Of Technology, Culture, Kinship, And Economics And The Experience Of Stress Described By African American Students Who Gained Weight During Their Freshman Year In College?, Shavon Darden
Graduate Theses, Dissertations, and Problem Reports (ETD)
African American college students are gaining weight at a pace faster than other ethnic groups yet research on this population is lacking. Exploration of freshman weight gain through the cultural lens of an African American student may provide a better understanding of this event. The research question for this study was, "How are the dimensions of technology, culture, kinship, economics, and the experience of stress described by African American students who gained weight during their freshman year in college?." Using Leininger's Cultural Care Theory and Sunrise Model as study frameworks, a qualitative study involving face-to-face interviews was conducted with directed …
Amphibian Metamorphosis In Created And Natural Wetlands, Lauren A. Mcpherson
Amphibian Metamorphosis In Created And Natural Wetlands, Lauren A. Mcpherson
Graduate Theses, Dissertations, and Problem Reports (ETD)
Functional assessment of created wetlands is an important factor in monitoring the success of wetland mitigation projects. Determining the ability of a created wetland to replace lost wildlife habitat and to support productive wildlife populations should be a priority in the assessment of created wetland success. We used a mesocosm design featuring water collected from 3 created wetlands and 3 natural wetlands in West Virginia to evaluate how the water quality from the 2 wetland types were able to support metamorphosis in larval spring peepers (Pseudacris crucifer) and wood frogs ( Rana sylvatica). Spring peepers displayed similar metamorphosis rates in …
Development And Evaluation Of An Objective Method For Forensic Examination Of Human Head Hairs Using Texture-Based Image Analysis, Allyce S. Mcwhorter
Development And Evaluation Of An Objective Method For Forensic Examination Of Human Head Hairs Using Texture-Based Image Analysis, Allyce S. Mcwhorter
Graduate Theses, Dissertations, and Problem Reports (ETD)
In response to criticism of traditional forensic methods of human head hair examination, the goal of this study was to develop and evaluate an objective method using texture-based image analysis. 120 individuals, including 20 from six different maternal groups, were sampled and their hairs evaluated using the developed method. Different variables were evaluated to develop the most efficient method to increase intra/inter ratio, as well as the percentage of well-classified hairs. The variables included different microscope systems, objective lenses, number of hairs examined per individual, hair shaft regions, focus methods, and normalization filter techniques. Statistical analyses included one-way analysis of …
Sexual Assault On The College Campus: A Partial Test Of Male Peer Support Theory, Falak Ojjeh
Sexual Assault On The College Campus: A Partial Test Of Male Peer Support Theory, Falak Ojjeh
Graduate Theses, Dissertations, and Problem Reports (ETD)
Researchers have identified a number of variables that influence sexual assault on college campuses; peer influence being one of them. According to the sexual assault literature, more than a quarter of victims of sexual assault report their offender was a fraternity member. Additionally, the literature shows that in many sexual assault cases, both the victim and the offender were intoxicated. In applying Walter DeKeseredy's theory of Male Peer Support -- all-male groups that legitimate women abuse -- to on-campus fraternity organizations, this study examines the link is between the drinking and rape cultures promoted by fraternities, specifically, the use of …
A Phenomenological Study Of Living With Excess Facial Hair For African-American Women, Courtney M. Pate
A Phenomenological Study Of Living With Excess Facial Hair For African-American Women, Courtney M. Pate
Graduate Theses, Dissertations, and Problem Reports (ETD)
Excess facial hair is a characteristic of hirsutism. Excess facial hair can alter a woman's presentation of self in living day-to-day. Research is sparse in the realm of studying women who do not suffer from polycystic ovarian syndrome, who have excess facial hair. Women of varying racial backgrounds are also underrepresented in the current literature. The purpose of this study was to explore the structure of meaning of living with excess facial hair for African-American women. The stories of eight women were gathered and analyzed using van Manen's phenomenological approach and middle range story theory. As a result of this …
Effect Of Time Of Pgf2alpha Application On Reproductive Outcome In Ewes, Callayn Danae Paul
Effect Of Time Of Pgf2alpha Application On Reproductive Outcome In Ewes, Callayn Danae Paul
Graduate Theses, Dissertations, and Problem Reports (ETD)
Traditionally, prostaglandin F2alpha (PGF2alpha) has been included in short-term progesterone-based estrous synchronization (STPBES) protocols but its inclusion has been associated with a reduction in fertility at the synchronized estrus. Also, previous studies have shown that there are differences in the endocrine status and follicular dynamics of ewes at different stages of the estrous cycle, although effects have not been sufficiently evaluated regarding the reproductive outcomes when luteolysis is induced on different days of the cycle. To evaluate the effect of time of application of PGF2alpha relative to the progesterone treatment on fertility, ewes (N=442) from 4 farms located in WV …
Evaluation Of An Evidence-Based Breastfeeding Education Program For Pediatric And Women's Health Care Providers, Family Practice Residents, Medical Students, And Physician Assistant Students, Alissa Terry Parker
Graduate Theses, Dissertations, and Problem Reports (ETD)
Background.;Every year approximately {dollar}13 billion are spent and an estimated 900 infant lives are lost in the United States as a result of infants not exclusively receiving breast milk for the first six months of life. Many health care providers lack knowledge and supportive skills regarding basic breastfeeding management. However, the results of several research studies indicate that health care providers who provide support and who are knowledgeable in breastfeeding management can improve the breastfeeding rates of the maternal-infant dyads that they serve. An evidence-based breastfeeding educational program can significantly increase the breastfeeding knowledge and attitudes of health care providers.;Objectives.;The …
Kriging-Based Design Of Experiments For Multi-Source Exposure-Response Studies In Nanotoxicology, Ying Pei
Kriging-Based Design Of Experiments For Multi-Source Exposure-Response Studies In Nanotoxicology, Ying Pei
Graduate Theses, Dissertations, and Problem Reports (ETD)
One of the major challenges with toxicology studies of nanomaterials (NMs), compared to traditional materials or chemicals, lies in the large NM variety (or sources) caused by their various physico-chemical properties. How to efficiently design multi-source biological experiments for the toxicity characterization of NMs in terms of their exposure-response profiles? This work intends to address this question by a two-stage experimental design procedure, which is developed based on the statistical model, stochastic kriging with qualitative factors (SKQ). With a given experimental budget, the SKQ-based design method aims at achieving the highest-quality SKQ, which synergistically models the exposure-response data from multiple …
Role Of Stem-Like Cells In Carbon Nanotube-Induced Pulmonary Fibrosis, Amruta Manke
Role Of Stem-Like Cells In Carbon Nanotube-Induced Pulmonary Fibrosis, Amruta Manke
Graduate Theses, Dissertations, and Problem Reports (ETD)
Recent studies have shown that pulmonary exposure to (CNT) results in rapid and progressive interstitial lung fibrosis in animals without causing persistent lung inflammation, which is normally associated with other known fibrogenic agents. This unusual fibrogenic effect of CNT raises important health issues since the exposure could result in deadly and incurable lung fibrosis. Accumulating evidence indicates the fibrogenic potential of carbon nanotubes, however, the underlying mechanism remains poorly addressed. Recent studies have demonstrated the pathogenic role of mesenchymal stem cells in pulmonary fibrosis that differentiate into myofibroblasts and contribute to disease progression. Understanding the molecular/cellular basis of these fibrosis-associated …
Role Of Multi-Site Phosphorylation In Regulation Of E(Spl) M8 Activity During Drosophila Neurogenesis, Mohna Bandyopadhyay
Role Of Multi-Site Phosphorylation In Regulation Of E(Spl) M8 Activity During Drosophila Neurogenesis, Mohna Bandyopadhyay
Graduate Theses, Dissertations, and Problem Reports (ETD)
Notch signaling is an evolutionarily conserved pathway that regulates cell-fate determination at various stages of development in invertebrate and vertebrate species. The Notch pathway mediates juxtacrine signaling through a process termed as lateral inhibition by which two equipotent cells adopt distinct cell fates. The functions of Notch have been exceptionally well analyzed during neurogenesis in Drosophila, particularly during eye and mechanosensory bristle morphogenesis. At the onset of neurogenesis, proneural bHLH activators encoded by atonal (ato) or the achaete-scute complex (ASC) is expressed in groups of cells, called proneural clusters (PNCs) in the eye and the bristle tissue respectively. From each …
A Journey In Magic And Realism Performing The Role Of Titania From William Shakespeare's "A Midsummer Night's Dream", Mya Brown
Graduate Theses, Dissertations, and Problem Reports (ETD)
This document consists of a detailed account of my process in developing my thesis role and the pedagogical experiences which have contributed to my artistry. The purpose of this thesis role was to allow exploration of the character Titania, from William Shakespeare's A Midsummer Night's Dream. Titania was an interesting character to portray due to the fact that I had previously performed this role. My study consisted of applying acting methodology to Shakespeare's play in order to realistically present a fresh characterization of the role. A detailed interpretation of the text along with the engagement of my imagination provided the …
The Modeling And Stability Analysis Of Humans Balancing An Inverted Pendulum, Yaohui Ding
The Modeling And Stability Analysis Of Humans Balancing An Inverted Pendulum, Yaohui Ding
Graduate Theses, Dissertations, and Problem Reports (ETD)
The control of an inverted pendulum is a classical problem in dynamics and control theory. Without active control, the inverted pendulum by itself is inherently unstable, thus serving as an ideal platform for control algorithms design and testing. This study utilizes an inverted pendulum setup to investigate the characteristics of manual control in executing a single-axial compensatory task. An inverted pendulum with sliding base on a single-axial rail was built for this purpose. Human subjects were asked to stabilize the pendulum by sliding the base on the rail. To mathematically quantify the characteristics of human manual control, a quasi-linear lead-lag …
A Novel Computational System For Identification Of Biological Processes From Multi-Dimensional High-Throughput Genomic Data, Julian Marshall Dymacek
A Novel Computational System For Identification Of Biological Processes From Multi-Dimensional High-Throughput Genomic Data, Julian Marshall Dymacek
Graduate Theses, Dissertations, and Problem Reports (ETD)
Identifying potential toxicity signaling pathways could guide future animal studies and support human risk assessment and intervention efforts. This thesis describes a novel computational approach for identifying biological processes and pathways that are significantly associated with a disease pathology from time series, dose response, gene expression data.;Our system employs a novel constrained non-negative matrix factorization algorithm and Monte Carlo Markov chain simulation to identify underlying patterns in mRNA gene expression data. Quantitative pathology can be used as a pattern constraint. The found patterns can be thought of as functions that influence a gene's expression. Using a database of curated gene …
The Keyboard Works Of Alex Shapiro, Elizabeth Mary Etnoyer
The Keyboard Works Of Alex Shapiro, Elizabeth Mary Etnoyer
Graduate Theses, Dissertations, and Problem Reports (ETD)
This project serves as a broad introduction to the keyboard works of American composer Alex Shapiro (1962-present), with primary focus on her works for solo piano. Ms. Shapiro has developed a well-established reputation as a serious and innovative composer, writing both acoustic and electroacoustic music for a variety of musical genres including instrumental solo and chamber music, as well as music for large ensembles. Shapiro's writing is often influenced by extramusical ideas, such as her solo piano piece Luvina (2007), a work based on the short story with that name by Mexican author Juan Rulfo. With scores that often include …
Investigations Of Pasteuria And The Root-Lesion Nematode Pratylenchus Penetrans In Soils Collected From Certified Organic Farms In The Mid-Atlantic United States, Tiara Nicole King
Investigations Of Pasteuria And The Root-Lesion Nematode Pratylenchus Penetrans In Soils Collected From Certified Organic Farms In The Mid-Atlantic United States, Tiara Nicole King
Graduate Theses, Dissertations, and Problem Reports (ETD)
Occurrence of lesion nematodes and Pasteuria, an obligate bacterial parasite, was surveyed in 34 soils collected from certified organic farms in the Mid-Atlantic United States. Pasteuria endospores were observed on Pratylenchus crenatus in six of 22 soils. Population density of Pratylenchus in soils lacking signs of Pasteuria correlated positively with soil pH, cation exchange capacity, and concentration of phosphorus pentoxide and calcium. Pasteuria was detected on Pratylenchus in nematode suppressive soils at the West Virginia University Organic Research Farm. Interactions between Pasteuria and Pratylenchus penetrans were studied in two laboratory bench-top experiments. Soil treatment effects on reproduction of Pratylenchus penetrans …
Improving Wellbore Cement Performance Through The Application Of Nano-Materials For Oil And Gas Integrity, Benjamin J. Kleiner
Improving Wellbore Cement Performance Through The Application Of Nano-Materials For Oil And Gas Integrity, Benjamin J. Kleiner
Graduate Theses, Dissertations, and Problem Reports (ETD)
It is the ultimate goal that the application of nano-materials in wellbore cement enhance not only the integrity of the cement, but also the public view of the petroleum industry. Wellbore integrity should be a paramount concern of all petroleum companies due to the potential severity of the consequences if integrity is not maintained. Ecosystems, animal and plant life, and even human life are at great risk if wellbore integrity fails. It is this fact that the motivation for this thesis is based upon. Nano silica is the nano-particle under investigation for this thesis. Furthermore, wellbore integrity will be improved …
Spatial And Temporal Distribution Of Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Ovisac And Its Associations With The Environment, Sunghoon Baek
Spatial And Temporal Distribution Of Hemlock Woolly Adelgid (Hemiptera: Adelgidae) Ovisac And Its Associations With The Environment, Sunghoon Baek
Graduate Theses, Dissertations, and Problem Reports (ETD)
Eastern hemlock, Tsuga canadensis (Pinales: Pinaceae) is an important tree species in eastern North America ecosystems. During the past 65 years, eastern hemlock stands have been threatened by the hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae). The goal of this research was to determine the spatial and temporal distribution of A. tsugae populations. First, the appropriate sample unit for A. tsugae was determined based on within-branch and -tree distribution of A. tsugae. The results of this study showed that A. tsugae ovisacs were more frequently found at the tip of a branch and no significant (P > 0.05) differences in …
Identification Of A Critical Gene In The Dihydroergot Alkaloid Pathway, Yulia Bilovol
Identification Of A Critical Gene In The Dihydroergot Alkaloid Pathway, Yulia Bilovol
Graduate Theses, Dissertations, and Problem Reports (ETD)
Ergot alkaloids, bioactive compounds produced by some species of fungi, have had significant impacts on agriculture and medicine. Claviceps purpurea and Epichloe spp. are ergot alkaloid producers associated with agricultural commodities and negatively affect humans and grazing animals, respectively. Another ergot alkaloid-producing fungus called Aspergillus fumigatus is ubiquitous in the environment; infections arising after inhaling the spores may kill immunocompromised persons. Ergot alkaloids and their derivatives are utilized by the pharmaceutical industry for the development of drugs. Some of these drugs are derived from lysergic acid, whereas others are derived from dihydrolysergic acid. Lysergic acid derivatives have vasoconstrictive properties and …
Phylogenetic Relationships Among Arbuscular Mycorrhizal Fungal Species In The Deeply Rooted Archaeosporales (Glomeromycota), Robert J. Bills
Phylogenetic Relationships Among Arbuscular Mycorrhizal Fungal Species In The Deeply Rooted Archaeosporales (Glomeromycota), Robert J. Bills
Graduate Theses, Dissertations, and Problem Reports (ETD)
Arbuscular mycorrhizal fungi (AMF) in the phylum Glomeromycota are globally distributed biotrophic fungi that form symbiotic associations with a majority of terrestrial plants. Their global beneficial role in plant and soil ecology warrants a better understanding of their evolutionary history and taxonomic relationships. This project focused on species relationships in two deeply rooted families Ambisporaceae and Archaeosporaceae. In one study, analysis of morphology and 28S ribosomal DNA (LSU) sequences resulted in two major changes that redefined Ambispora to include only species that were dimorphic for both acaulosporoid and glomoid spore types. First, species described as producing only glomoid spores (Am. …