The Influence Of The Invasive Chinese Tallow (Triadica Sebifera) Leaf Litter On Aquatic Chemistry And Microbial Community Composition, 2016 Stephen F Austin State University
The Influence Of The Invasive Chinese Tallow (Triadica Sebifera) Leaf Litter On Aquatic Chemistry And Microbial Community Composition, Raymond D. Montez
Electronic Theses and Dissertations
Global climate change and anthropogenic activity have facilitated the movement and invasive potential of nonnative plants in native environments. These invasions can have negative effects on ecosystem diversity and function. The nonnative and invasive plant, Chinese Tallow (Triadica sebifera), has already invaded much of the south eastern US where it is outcompeting native tree species and changing ecosystem diversity in a variety of habitats. Leaf litter from the Chinese tallow has been shown cause changes in dissolved oxygen and pH in the aquatic environment. Turbidity is also affected when Chinese tallow litter is present in water. A series of experiments ...
Fecal Bacterial Communities As An Indicator Of Trophic Interactions Among Anuran Larvae, 2016 University of Southern Mississippi
Fecal Bacterial Communities As An Indicator Of Trophic Interactions Among Anuran Larvae, Steven Jacob Everman
Anurans are mass spawners, often with multiple females spawning together, resulting in thousands of tadpoles sharing a habitat. Such large numbers of tadpoles with limited dispersal can lead to intense competition for resources. Inter and intra-specific competition for food could have negative impacts on the growth and survival of smaller tadpoles. Fecal bacterial communities have the potential to be used as indicators of changes in diet making it possible to determine if tadpoles in the wild are eating the same food or not. After feeding on two prepared diets that differed in the percentage of complex carbohydrates, the fecal bacterial ...
Exploring Enrichment Cultures Of Denitrifying Microorganisms From El Yunque National Forest, 2016 University of Tennessee, Knoxville
Exploring Enrichment Cultures Of Denitrifying Microorganisms From El Yunque National Forest, Samiha Ahsan, Jenny Onley, Frank Loeffler
University of Tennessee Honors Thesis Projects
No abstract provided.
Molecular And Ecological Aspects Of The Interactions Between Aureococcus Anophagefferens And Its Giant Virus, 2016 University of Tennessee, Knoxville
Molecular And Ecological Aspects Of The Interactions Between Aureococcus Anophagefferens And Its Giant Virus, Mohammad Moniruzzaman
Viruses are increasingly being recognized as an important biotic component of all ecosystems including agents that control the rapid ecological events that are harmful algal blooms (HABS). Aureococcus anophagefferens is a pelagophyte which causes recurrent ecosystem devastating brown tide blooms along the east coast of the USA and has recently spread to China and South Africa. It has been suggested that a large virus (AaV) is possibly an important agent for demise of brown tide blooms. This observation is consistent with the recognition of a number of other giant viruses modulating algal blooms in marine systems. In this dissertation, we ...
Hydrothermal Venting And Mineralization In The Crater Of Kick’Em Jenny Submarine Volcano, Grenada (Lesser Antilles), 2016 Western Washington University
Hydrothermal Venting And Mineralization In The Crater Of Kick’Em Jenny Submarine Volcano, Grenada (Lesser Antilles), Steven Carey, Rene Olsen, Katherine L. C. Bell, Robert Ballard, Frederic Dondin, Chris Roman, Clara Smart, Marvin Lilley, John Lupton, Brad Seibel, Winton Cornell, Craig L. Moyer
Craig L. Moyer
Kick’em Jenny is a frequently erupting, shallow submarine volcano located 7.5 km off the northern coast of Grenada in the Lesser Antilles subduction zone. Focused and diffuse hydrothermal venting is taking place mainly within a small (~70 3 110 m) depression within the 300 m diameter crater of the volcano at depths of about 265 m. Much of the crater is blanketed with a layer of fine-grained tephra that has undergone hydrothermal alteration. Clear fluids and gas are being discharged near the center of the depression from mound-like vents at a maximum temperature of 180ᵒC. The gas consists ...
Characterization Of Antimicrobial Activity Of Culturable Bacteria Isolated From Krubera-Voronja Cave, 2016 Vilnius University
Characterization Of Antimicrobial Activity Of Culturable Bacteria Isolated From Krubera-Voronja Cave, Aiste Klusaite, Vida Vickackaite, Birute Vaitkeviciene, Rasa Karnickaite, Dominykas Bukelskis, Ieva Kieraite-Aleksandrova, Nomeda Kuisiene
International Journal of Speleology
In the present study we aimed to perform the first analysis of antimicrobial activity of bacteria isolated from Krubera-Voronja Cave, with the main focus on their activity against Grampositive bacteria, including Gram-positive pathogens. Using five different media, in total 874 heterotrophic cultures were isolated from water and sediment samples collected in Krubera-Voronja Cave at a depth from 220 m to 1640 m. 14.0% of all isolates demonstrated antibacterial activity against Gram-positive and Gram-negative test microorganisms. Our results show that this percentage was not uniform; it increased with the sampling depth and was the highest in the lower part of ...
Atp Luminescence Assay As A Bioburden Estimator Of Biomass Accumulation In Caves, 2016 Karst Research Institute, Scientific Research Centre of the Slovenian Academy of Sciences and Arts
Atp Luminescence Assay As A Bioburden Estimator Of Biomass Accumulation In Caves, Janez Mulec, Andreea Oarga-Mulec
International Journal of Speleology
A commercially available adenosine triphosphate (ATP) detection system (Hygiena, USA), supported by cultivable microbial indicators, was used to estimate bioburden in different habitats in and outside show caves: air, water and solid surfaces. A strong positive correlation between ATP concentration expressed as Relative Light Units (RLU) and Colony-Forming-Units (CFU) was observed for swab samples from cave surfaces. In terms of ATP units, surfaces in a single cave system (Postojna Cave) varied considerably (240-1,258,800 RLU/ 20 cm2) and commonly exceeded the bioburden level of analogues on the surface (0-114,390 RLU/ 20 cm2). Cave sub-habitats were colonized ...
Do Novel Weapons That Degrade Mycorrhizal Mutualisms Explain Invasive Species Success?, 2016 Buffalo State College
Do Novel Weapons That Degrade Mycorrhizal Mutualisms Explain Invasive Species Success?, Philip L. Pinzone Mr.
Invasive plants often dominate novel habitats where they did not co-evolve with local species. Several hypotheses suggest mechanisms that explain increased exotic plant success, including 'novel weapons' and 'degraded mutualisms'. Japanese knotweed (Fallopia japonica) and European buckthorn (Rhamnus cathartica) are widespread plant invaders in North America that can dominate ecosystems. The goal of this study is to test whether these impacts are more consistent with novel weapons or degraded mutualism hypotheses. I examine tree seedling recruitment, (germination and initial survival) growth, (biomass) and mycorrhizal invasion (AMF content) as a function of F. japonica and R. cathartica root exudates. Given that ...
Microbial Extracellular Enzymes In Marine Sediments: Methods Development And Potential Activities In The Baltic Sea Deep Biosphere, 2016 University of Tennessee, Knoxville
Microbial Extracellular Enzymes In Marine Sediments: Methods Development And Potential Activities In The Baltic Sea Deep Biosphere, Jenna Marie Schmidt
The deep biosphere is defined as the subsurface ecosystem in which little energy is available to microorganisms and microorganisms can live for thousands of years. Heterotrophic microbes survive in the deep biosphere even though organic matter is limited and highly recalcitrant in nature. Measuring microbial extracellular enzyme activity provides a potential means to evaluate the rate at which microorganisms are performing carbon remineralization in the energy limited sediment beneath the seafloor. Extracellular enzymes breakdown organic compounds so that the nutrients can move inside the cell and be used for energy. This study explored the role extracellular enzymes play in the ...
From Milpas To The Market: A Study On The Use Of Metal Silos For Safer And Better Storage Of Guatemalan Maize, 2016 University of Nebraska-Lincoln
From Milpas To The Market: A Study On The Use Of Metal Silos For Safer And Better Storage Of Guatemalan Maize, José Rodrigo Mendoza
Dissertations & Theses in Food Science and Technology
This project aimed to implement the use of metal silos to improve quality and safety of maize consumed by inhabitants of the highlands of Guatemala. This manuscript includes a literature review of the maize production chain in Guatemala, a survey about agricultural practices used in the region of study, as well as a characterization of the analyzed maize regarding its mycoflora, nutritional composition, and insect infestation. To better understand the current situation regarding agricultural practices and maize consumption, a survey was carried out. Sample consisted of 280 families representing 14 rural communities distributed in the townships of Todos Santos and ...
Bioaugmentation And Correlating Anaerobic Digester Microbial Community To Process Function, 2016 Marquette University
Bioaugmentation And Correlating Anaerobic Digester Microbial Community To Process Function, Kaushik Venkiteshwaran
Dissertations (2009 -)
This dissertation describes two research projects on anaerobic digestion (AD) that investigated the relationship between microbial community structure and digester function. Both archaeal and bacterial communities were characterized using high-throughput (Illumina) sequencing technology with universal 16S rRNA gene primers. In the first project, bioaugmentation using a methanogenic, aerotolerant propionate enrichment culture was investigated as a possible method to increase digester methane production. Nine anaerobic digesters, seeded with different biomass, were operated identically and their quasi steady state function was compared. Before bioaugmentation, different seed biomass resulted in different quasi steady state function, with digesters clustering into high, medium or low ...
Comparative Genomics, Transcriptomics, And Physiology Distinguish Symbiotic From Free-Living Chlorella Strains, 2016 University of Nebraska-Lincoln
Comparative Genomics, Transcriptomics, And Physiology Distinguish Symbiotic From Free-Living Chlorella Strains, Cristian F. Quispe, Olivia Sonderman, Maya Khasin, Wayne R. Riekhof, James Van Etten, Kenneth Nickerson
Kenneth Nickerson Papers
Most animal–microbe symbiotic interactions must be advantageous to the host and provide nutritional benefits to the endosymbiont. When the host provides nutrients, it can gain the capacity to control the interaction, promote self-growth, and increase its fitness. Chlorella-like green algae engage in symbiotic relationships with certain protozoans, a partnership that significantly impacts the physiology of both organisms. Consequently, it is often challenging to grow axenic Chlorella cultures after isolation from the host because they are nutrient fastidious and often susceptible to virus infection. We hypothesize that the establishment of a symbiotic relationship resulted in natural selection for nutritional and ...
Microbial Biodiversity Associated With The Walnut Juglans Regia L. In South Tyrol (Italy), 2016 Research Centre for Agriculture and Forestry, Laimburg
Microbial Biodiversity Associated With The Walnut Juglans Regia L. In South Tyrol (Italy), Ruth Pardatscher, Wolfgang Schweigkofler
The endophytic and epiphytic microflora from walnut trees in South Tyrol (Northern Italy) was analyzed. A total of 16 trees from 8 sites were sampled at three dates during the warm season (May, July and September) in 2005, using plant material from three different tissue types (leaves, fruit and lignified twigs). Samples were either transferred directly onto nutrient medium or surface sterilized prior to plating to distinguish between epiphytic and endophytic growth. A total of 3,880 culturable isolates were obtained, the vast majority of the isolates (3,742) belonging to fungi (96.4%); only 138 (3.6%) were bacteria ...
Comparison Of Synthetic Versus Organic Herbicides/Insecticides On Arbuscular Mycorrhizal Fungi In Abelmoschus Esculentus, 2016 Florida International University
Comparison Of Synthetic Versus Organic Herbicides/Insecticides On Arbuscular Mycorrhizal Fungi In Abelmoschus Esculentus, Ariel Freidenreich
FIU Electronic Theses and Dissertations
Arbuscular mycorrhizal fungi (AMF) play a crucial role in improving the growth of a vast majority of plants. Past researchers have discovered that agricultural practices have a significant negative effect on the diversity of AMF. Arbuscular mycorrhizal fungi are reported to enhance plant nutrient uptake, stress tolerance, and soil aggregate formation which are key aspects of productive low-input farming. The objective of this study was to investigate the effects of four pesticides on the ability of AMF to colonize the roots of okra plants (Abelmoschus esculentus). The pesticides being tested include two synthetic chemicals (glyphosate and carbaryl) and two organic ...
Characterization Of The Marine Sponge Amphimedon Compressa Microbiome Across A Spatial Gradient, 2016 Nova Southeastern University
Characterization Of The Marine Sponge Amphimedon Compressa Microbiome Across A Spatial Gradient, Renee Michelle Potens
Theses and Dissertations
Diverse and ecologically important microbial communities (microbiomes) are symbiotic within marine sponges. In this study, the microbiome of Amphimedon compressa from three sample locations (Broward and Dade Counties, Southeast Florida, USA and the Southern Caribbean, Bocas del Toro, Panama) is characterized using 16S rRNA Illumina sequencing. The predominant taxa are Proteobacteria and Cyanobacteria, as expected for Low Microbial Abundance sponges, accounting for over 53% of the total microbiome community. The numbers of Operational Taxonomic Units (OTUs) decrease from Broward County (2,900) to Dade County (2,300) and then Bocas del Toro (1,200). The correlates to a decreasing north-south ...
Lignocellulose As Carbon Source Promotes Bacterial Synergism And Reduces Antagonism, 2016 The University of Southern Mississippi
Lignocellulose As Carbon Source Promotes Bacterial Synergism And Reduces Antagonism, Yijie Deng
Lignocellulose decomposes slowly in nature because it consists of complex polymers resistant to enzymatic degradation by most organisms. Some bacteria are capable of producing cellulolytic enzymes but the way in which bacteria interact within a community to enhance degradation of the recalcitrant substrate is poorly understood. A better understanding of how bacterial interactions affect lignocellulose degradation would provide potential approaches to improve the efficiency of lignocellulose degradation for biofuel production.
To study whether bacterial interactions enhance lignocellulose degradation, I grew environmental bacterial isolates in mixed cultures and pure cultures. I found that bacterial synergism in mixed cultures was common in ...
Disease-Causing Fungi In Homes And Yards In The Midwestern United States, 2016 Aurora UW Medical Group, Aurora Health Care
Disease-Causing Fungi In Homes And Yards In The Midwestern United States, Dennis J. Baumgardner
Dennis J. Baumgardner. MD
A number of fungal pathogens that may result in a variety of human diseases are found in residential homes and yards. The growth of these microscopic fungi is often favored by particular characteristics of the dwelling and nearby outdoor environment. Evolved virulence factors or increased ability of specific fungi to grow in diverse, and sometimes harsh, microenvironments presented by the domestic environment may promote growth and pathogenesis. Infection may occur by inhalation or direct inoculation and include endemic fungi in addition to opportunistic or emerging species. Systemic or locally aggressive fungal infections are particularly likely and may be life-threatening in ...
Handwashing: A Study Of The History, Methods, And Psychology Surrounding Hand Hygiene, 2016 Liberty University
Handwashing: A Study Of The History, Methods, And Psychology Surrounding Hand Hygiene, Daniel J. Remillard
Senior Honors Theses
This paper covers three different areas concerning handwashing. First a review of the history of handwashing is done, going from ancient times to its introduction into modern medicine via Dr. Ignaz Semmelweis. This section gives a sobering reminder not to instantly reject data that comes in conflict with prevalent thought.
Then current medical knowledge about handwashing is examined, and the conclusion reached states that handwashing is best done with non-antibacterial soap.
Finally, a review of the psychology of handwashing shows that medical professionals often tend toward neglect if unwatched and unmotivated by an outside source. However, those suffering from obsessive ...
Environmentally Driven Orchestration Of Metabolisms By Prochlorococcus Spp., 2016 University of Tennessee - Knoxville
Environmentally Driven Orchestration Of Metabolisms By Prochlorococcus Spp., Martin James Szul
In the oligotrophic waters of the world’s open oceans physical factors such as pH, salinity, and temperature are generally stable. The nutrient limited conditions as well as the low environmental variability endemic to these ecosystems select for specialists that gain fitness advantages through minimalism, efficiency, and thrift. These physical characteristics are thought to reduce nutrient demand while allowing for constant metabolic activity and growth, but the mechanisms that promote these fitness advantages are currently unknown. To better understand how these physiologies improve selective fitness for the dominant phytoplankton, we observed metabolic parameters under environmental conditions typical to these waters ...
Characterization Of The Juvenile Green Turtle (Chelonia Mydas) Microbiome Associated With The Ontogenic Shift From Pelagic Habitats To Inshore Resident Areas, 2016 Indiana University - Purdue University Fort Wayne
Characterization Of The Juvenile Green Turtle (Chelonia Mydas) Microbiome Associated With The Ontogenic Shift From Pelagic Habitats To Inshore Resident Areas, James T. Price
Animal microbiomes have become increasingly regarded as a system responsible for supporting vital functions, such as digestion, amino acid production, and immune response. Despite their importance, there is limited understanding of the microbiome of sea turtles and the effect it has on their overall health. Green turtles (Chelonia mydas) provide an interesting model of change in these microbial communities since they undergo a pronounced shift from a surface-pelagic distribution and omnivorous diet to a more shallow coastal distribution and herbivorous diet. We investigated the cloacal microbiomes of juvenile green turtles before and after this recruitment to neritic waters to characterize ...