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Articles 1 - 16 of 16
Full-Text Articles in Life Sciences
Biofilm Characterization And The Potential Role Of Edna In Horizontal Gene Transfer In Hospital And Meat Isolates Of Staphylococcus Aureus And Their Biofilms, Ashley Lynne Ball
Biofilm Characterization And The Potential Role Of Edna In Horizontal Gene Transfer In Hospital And Meat Isolates Of Staphylococcus Aureus And Their Biofilms, Ashley Lynne Ball
Theses and Dissertations
Staphylococcus aureus is a pathogen responsible for a wide variety of life-threatening diseases such as bacteremia, endocarditis, and pneumoniae. S. aureus has been a major concern in recent years due to the rampant spread of antibiotic resistance. The ability of S. aureus to form biofilms aids in the spread of antibiotic resistance as biofilms are a known hotspot for horizontal gene transfer. Biofilms also protect cells from host immune responses and antibiotics, making these infections very difficult to treat. The matrix of S. aureus biofilms can be made of polysaccharides, protein, and DNA. In these studies, we sought to elucidate …
The Expanding Marine Built Environment And Biofilm Formation Processes, Rachel Mugge
The Expanding Marine Built Environment And Biofilm Formation Processes, Rachel Mugge
Dissertations
The marine built environment (i.e., places or things made or modified by humans) in the northern Gulf of Mexico is rapidly expanding and includes over 2,000 known historic shipwrecks, nearly 4,100 artificial reefs, and other built structures for natural resource extraction, marine aquaculture, renewable energy generation, munitions dumping areas, and commercial and recreational activities. While these structures have the potential to develop into artificial reefs, acting as biodiversity hotspots that provide food and shelter and facilitate organism transport, it is unclear how they affect biodiversity and ecosystem function in the marine environment. The success of artificial reefs to become ecosystems …
Consequences Of Biofilm Architecture On Vibrio Cholerae Ecology And Life History, Benjamin Ray Wucher
Consequences Of Biofilm Architecture On Vibrio Cholerae Ecology And Life History, Benjamin Ray Wucher
Dartmouth College Ph.D Dissertations
The diversity of microbes and the environments they inhabit are staggering. In many of these environments, bacteria have evolved to form sessile surface attached communities called biofilms. These biofilms have wide reaching impacts from importance in global carbon cycling, to persistent catheter infections, to biofouling and wastewater treatment. While many species of microbes form biofilms to survive in their environment, the architectures of these structures vary widely between organisms. Even though a great deal of work has been done to understand bacterial communities and their functions, little work has examined how the spatial aspects of biofilm architecture can affect the …
Identification And Characterization Of Genetic Elements That Regulate A C-Di-Gmp Mediated Multicellular Trait In Pseudomonas Fluorescens, Collin Kessler
Identification And Characterization Of Genetic Elements That Regulate A C-Di-Gmp Mediated Multicellular Trait In Pseudomonas Fluorescens, Collin Kessler
Electronic Theses and Dissertations
Microbial communities contain densely packed cells where competition for space and resources are fierce. These communities are generally referred to as biofilms and provide advantages to individual cells against immunological and antimicrobial intervention, dehydration, and predation. High intracellular pools of cyclic diguanylate monophosphate (c-di-GMP) cause cells to aggregate during biofilm formation through the production of diverse extracellular polymers. Genes that encode c-di-GMP catalytic enzymes are commonly mutated during chronic infections where opportunists display enhanced resistance to phagocytosis and antibiotics. Our lab uses an emergent multicellular trait in the model organism Pseudomonas fluorescens Pf0-1 to study the emergence of c-di-GMP mutations …
Clostridioides Difficile Biofilm And Spore Production In Response To Antibiotics And Immune Stress, Adenrele M. Oludiran
Clostridioides Difficile Biofilm And Spore Production In Response To Antibiotics And Immune Stress, Adenrele M. Oludiran
Chemistry & Biochemistry Theses & Dissertations
The development of new therapeutic options against Clostridioides difficile (C. difficile) infection is a critical public health concern, as the causative bacterium is highly resistant to multiple classes of antibiotics. C. difficile, an anaerobic spore-forming Gram-positive pathogenic bacterium, is a major cause of hospital-acquired infections. C. difficile persists in the environment and spreads the infection to new hosts in the form of dormant spores and can persist within hosts as surface-attached biofilms. These studies investigate bacterial vegetative cell survival, biofilm formation, and sporulation in response to stress. Antimicrobial host-defense peptides (HDPs) are highly effective at simultaneously modulating …
Growth Outcomes Of Pseudomonas Aeruginosa Inhibitor Of Vertebrate Lysozyme Knockouts In Conditions Mimicking The Cystic Fibrosis Lung Environment, Amani Gaddy
Master of Science in Chemical Sciences Theses
Pseudomonas aeruginosa (PA) is a Gram-negative bacterium, often found in cystic fibrosis (CF) patients and can lead to the decline of lung functioning and premature death in 80% of infected patients when microcolonies form within the mucin of the lung. Due to its major capacity for antibiotic resistance, an alternative strategy towards defending against the bacterial invasion of PA is by the antibacterial activity of our own innate immune system with use of elements such as lysozyme. Pseudomonas aeruginosa inhibitor of vertebrate lysozyme class 1 (Ivyp1) is a periplasmic protein produced by gram-negative bacteria that inhibits the enzymatic activity of …
The Role Of L-Alanine Signaling In Aspergillus Fumigatus Biofilm Adherence, Carbon Catabolism, And Echinocandin Susceptibility., Joshua D. Kerkaert
The Role Of L-Alanine Signaling In Aspergillus Fumigatus Biofilm Adherence, Carbon Catabolism, And Echinocandin Susceptibility., Joshua D. Kerkaert
Dartmouth College Ph.D Dissertations
Aspergillus fumigatus is a saprophytic filamentous fungus that participates in environmental carbon and nitrogen cycles through the degradation of complex organic substrates. In addition to its ecological role, A. fumigatus is the primary causative agent of a spectrum of diseases depending on the immune status of the individual, the most lethal of which is invasive aspergillosis (IA). Treatment strategies for IA are limited and far too frequently fail. Despite the high rates of treatment failure, antifungal resistance remains relatively low, albeit rising at a concerning rate. Insights into this discrepancy between the rate of treatment failure and the rate of …
Biomass Estimation Of Marine Biofilms On Plastic Surfaces, Kian Banihashemi, Fernando Javier Gil
Biomass Estimation Of Marine Biofilms On Plastic Surfaces, Kian Banihashemi, Fernando Javier Gil
Biological Sciences
Plastics have become a major source of marine pollution, which threatens food safety and quality, human health, and marine ecosystems. Due to the drastic negative effects of plastics in a marine environment, alternative biodegradable plastics are being generated that are more eco-friendly and have less environmental impact. Though some of these plastics are known to biodegrade, the process of degradation for bioplastics has not been heavily studied in a marine environment. This pilot project sought to both quantify the process of biodegradation and compare across different methods for effectiveness of biomass estimation, which serves as an indicator of biodegradation. Plastics …
Identification Of Pneumococcal Membrane Proteins Involved In Colonization/Biofilm Formation And Cognate Host Cellular Receptors, Yoonsung Hu
Theses and Dissertations
Colonization is prerequisite for infection and transmission of Streptococcus pneumoniae, or pneumococcus. Currently available pneumococcal conjugate and pneumococcal polysaccharide vaccines can provide protection against a limited number of capsular serotypes. Implementation of vaccines has decreased the frequency of invasive pneumococcal disease and their colonization rates, but only in a serotype-dependent manner. This has led to serotype replacement in pneumococcal ecology and increased invasive disease caused by non-vaccine serotypes. Development of conserved protein-based vaccine that can provide protection against all pneumococcal serotypes is needed. Numerous surface proteins are conserved in all serotypes, and some are known to be involved in …
Periodic Spatial Disturbances Alter The Expression Of Quorum Sensing Virulence Factors In Pseudomonas Aeruginosa, Laura García-Diéguez
Periodic Spatial Disturbances Alter The Expression Of Quorum Sensing Virulence Factors In Pseudomonas Aeruginosa, Laura García-Diéguez
All HCAS Student Capstones, Theses, and Dissertations
Pseudomonas aeruginosa is an opportunistic pathogen associated with severe acute and chronic illnesses. Current antibiotic-based approaches fail to effectively treat P. aeruginosa infections due to the effectiveness and robustness of the quorum sensing signaling system (QS). Pathogenic bacteria, such as P. aeruginosa, employ this population density-dependent communication mechanism to confer antimicrobial resistance, propagate infection, and coordinate the expression of virulence factors, through the production and detection of autoinducing signaling molecules (AI). As such, there is a growing interest in developing novel non-antibiotic-based techniques to attenuate the pathogenicity of P. aeruginosa by disrupting the functionality of its QS system. Previous …
Ecology Of Periphyton In A Subtropical River Floodplain, Kamela De Gallardo
Ecology Of Periphyton In A Subtropical River Floodplain, Kamela De Gallardo
LSU Doctoral Dissertations
The Atchafalaya River Basin (ARB) in southcentral Louisiana, USA, is a large and biologically diverse floodplain surrounding the Atchafalaya River (AR), which is the largest distributary of the Mississippi River, receiving 30% of the combined daily discharge of the Mississippi and Red Rivers. Annual flooding facilitates exchange between the AR and its floodplain and is thought to give rise to the high productivity of the river-floodplain system. Primary production within the aquatic ARB is driven by periphytic algae, phytoplankton, and aquatic macrophytes, however, very little is known about periphytic algal assemblages in floodplain systems. In this study, artificial substrates were …
Calcium-Mediated Induction Of Vibrio Fischeri Es114 Biofilms, Katia Elizabeth Semenchuk
Calcium-Mediated Induction Of Vibrio Fischeri Es114 Biofilms, Katia Elizabeth Semenchuk
Master's Theses
Vibrio fischeri bacteria form biofilms that facilitate symbiotic colonization of the Hawaiian bobtail squid, Euprymna scolopes. These host-associated biofilms require production of the SYP polysaccharide. However, it has been difficult to observe robust biofilm formation in vitro in a laboratory setting using wild-type strain ES114; instead, most work investigating syp-dependent biofilm formation has relied on genetically altered strains. Guided by recent findings that increasing calcium induces c-di-GMP (Tischler et al., 2021), a molecule known in other systems to promote biofilm formation, the question was posed as to whether high levels of calcium alone could promote syp-dependent biofilm formation by ES114. …
Biofilmgeneset: Leveraging Multi-Omics Data Mining And Ica To Discover Biofilm Stage Genes Of Interest From Condition-Specific Expression Dataset, Mathew Olakunle Alaba
Biofilmgeneset: Leveraging Multi-Omics Data Mining And Ica To Discover Biofilm Stage Genes Of Interest From Condition-Specific Expression Dataset, Mathew Olakunle Alaba
Dissertations and Theses
Biofilm formation occurs in the attachment, colony, maturation, and dispersion stages. Understanding the molecular basis at every point of this process is essential to developing efficient diagnostics devices and effective antibiofilm agents. Gene expression data provide molecular insight for both static and temporal biofilm development. The most used analytic techniques for biofilm gene expression data are clustering and network inference algorithms, which class genes with similar expressions across the samples. However, these methods are inherently deficient because they do not capture gene(s) expressed in a subset of the samples. These subsets might be unique to a developmental stage, for example. …
Inhibition Of Staphylococcus Aureus Biofilm By Variovorax Paradoxus, Esther Gomez
Inhibition Of Staphylococcus Aureus Biofilm By Variovorax Paradoxus, Esther Gomez
University of the Pacific Theses and Dissertations
Staphylococcus aureus is one of the leading causes of fatal nosocomial infections. Often, S. aureus can grow as a biofilm which protects the population from the surrounding environment. Strains of S. aureus are resistant to virtually all known antibiotics on the market. Variovorax paradoxus is a soil microbe with many unusual metabolic activities. It has been previously observed that, V. paradoxus can inhibit the growth of S. aureus when in co-culture. In this work we report on inhibition of S. aureus biofilm formation by V. paradoxus due to a suspected inhibitory soluble factor.
Identification Of The Role Of Swra In Copper Induced Poly-Gamma-Glutamic Acid Production In Bacillus Subtilis, Maya Addison
Identification Of The Role Of Swra In Copper Induced Poly-Gamma-Glutamic Acid Production In Bacillus Subtilis, Maya Addison
Scripps Senior Theses
Each year over 2.8 million Americans are infected by an antibiotic resistant strain of bacteria with over 35, 000 dying as a result (CDC). The lack of development of new antibiotics has renewed interest in the antimicrobial properties of copper. Gram positive bacterium such as Bacillus subtilis produce poly-gamma-glutamic acid (γ-PGA) to sequester excess copper ions. swrA has shown to be essential for proper activation of the pgs operon by phosphorylated DegU via an unknown mechanism. This study seeks to determine the role of swrA in copper induced gamma-PGA production and if swrA and ppsB are involved in copper resistance. …
Understanding How The Relative Abundance Of Candida Species Impacts Transcriptional Regulation In Coculture Biofilms, Diksha Kool
Understanding How The Relative Abundance Of Candida Species Impacts Transcriptional Regulation In Coculture Biofilms, Diksha Kool
Master's Projects
ABSTRACT Candida albicans and Candida glabrata are common fungal species that can change from commensal to pathogen due to their ability to form robust biofilms. Candida species are the leading cause of life-threatening conditions like Candidemia, and the existing treatments for biofilm-related infections are suboptimal. Research shows that the relative abundance of the two Candida species promotes biofilm formation, enhances pathogenicity, and increases antibiotic resistance. Thus, focusing on the importance of coculture, this paper utilizes RNA sequencing to investigate the gene expression leading to biofilm development in coculture through a time-series study.