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Articles 1 - 11 of 11
Full-Text Articles in Life Sciences
Investigation Of A Carbon Monoxide Dehydrogenase From An Uncultured Archaeon, Luke Moore
Investigation Of A Carbon Monoxide Dehydrogenase From An Uncultured Archaeon, Luke Moore
Dissertations, Master's Theses and Master's Reports
The Nickel based Carbon Monoxide Dehydrogenase (CODH) is an anaerobic metalloenzyme responsible for the reversible conversion of CO and water into CO2 and 2 protons and 2 electrons. This enzyme has importance in the environment as one of Earth’s first carbon fixation pathways, and for human uses as a potential source of biofuels and other commodity chemicals. CODH enzymes are present in a wide array of taxa, many of which are uncultured. In this study we express and purify the catalytic subunit (CooS) of the anaerobic CODH from an uncultured Hydrothermarchaeota JdFR-17 co-expressed with the nickel insertion accessory protein (CooC) …
Cancer And Quiescence: Investigating How The Dream Complex And Retinoblastoma Regulate The Cell Cycle, Lydia Rotman
Cancer And Quiescence: Investigating How The Dream Complex And Retinoblastoma Regulate The Cell Cycle, Lydia Rotman
Dissertations, Master's Theses and Master's Reports
An estimated 1.9 million people in the United States will be diagnosed with cancer in 2022. Cancer is characterized by uncontrolled cell growth, resulting from loss-of-function of key cell cycle regulatory proteins. The retinoblastoma protein (pRb) and p130, are two proteins that regulate cellular entry into the cell cycle. Both pRb and p130 repress expression of cell cycle genes, with pRb interacting with and suppressing E2F-DP transcriptional activators and p130 assembling in the DREAM transcriptional repressor complex. When normal cells receive signals to enter the cell cycle, cyclin and cyclin-dependent kinase (CDK) complexes phosphorylate pRb and p130, causing both to …
Auxin-Induced Degradation Of Dream Proteins, Lin-9 And Lin-54, In Caenorhabditis Elegans, Karli E. Chosa
Auxin-Induced Degradation Of Dream Proteins, Lin-9 And Lin-54, In Caenorhabditis Elegans, Karli E. Chosa
Dissertations, Master's Theses and Master's Reports
The Dp, Retinoblastoma, E2F, And MuvB (DREAM) complex mediates transcriptional repression and is highly conserved throughout a number of species, including vertebrates, Drosophila melanogaster, and Caenorhabditis elegans. Differing from mammalian DREAM, C.elegans DRM, appears to act solely in a repressive role, with the MuvB subcomplex (LIN-9, LIN-37, LIN-52, LIN-53, and LIN-54) playing a key role in the repression of genes. In this study, we use the auxin-inducible degron (AID) system, an effective, fast-acting, tool used in the degradation of degron-tagged proteins to individually deplete two key proteins of the MuvB subcomplex, LIN-9 and LIN-54, in C. elegans. The …
Applications Of Machine Learning In Microbial Forensics, Ryan B. Ghannam
Applications Of Machine Learning In Microbial Forensics, Ryan B. Ghannam
Dissertations, Master's Theses and Master's Reports
Microbial ecosystems are complex, with hundreds of members interacting with each other and the environment. The intricate and hidden behaviors underlying these interactions make research questions challenging – but can be better understood through machine learning. However, most machine learning that is used in microbiome work is a black box form of investigation, where accurate predictions can be made, but the inner logic behind what is driving prediction is hidden behind nontransparent layers of complexity.
Accordingly, the goal of this dissertation is to provide an interpretable and in-depth machine learning approach to investigate microbial biogeography and to use micro-organisms as …
Role Of Microrna-483 In Pancreatic Β-Cells, Jackson Waugh
Role Of Microrna-483 In Pancreatic Β-Cells, Jackson Waugh
Dissertations, Master's Theses and Master's Reports
Insulin is an essential hormone produced by β-cells in the pancreas. The release of insulin is tightly regulated in healthy people in order to control blood sugar level in our body. However, people with Type 2 Diabetes have insufficient insulin secretion from pancreatic β-cells, leaving to high blood sugar (hyperglycemia) and β-cell failure. microRNAs (miRNAs or miR) are newly discovered small regulatory molecules and have emerged as important regulator of cell growth, differentiation, and organ function. Altered miRNA function has been implicated in the pathogenesis of a variety of human disease, including diabetes. In this report, we focus on dissecting …
The Impact Of Household Biocides And Antibiotics On Aquatic Microbial Community Composition, Abdulaziz Saud M Alrashdi
The Impact Of Household Biocides And Antibiotics On Aquatic Microbial Community Composition, Abdulaziz Saud M Alrashdi
Dissertations, Master's Theses and Master's Reports
Triclosan (TCS) is antimicrobial agent that is used in a lot of consumer products, including toothpaste, liquid and bar soap, and cosmetics. TCS has been found in many lakes and rivers in the United States. However, The Food and Drug Administration (FDA) banned TCS recently and it will no longer be used in household products. Despite the recent ban, TCS is known to persist in the environment and may have long-term impacts. We conducted an experiment on using fresh water from three locations Houghton, Green Bay and the Huron Mountains. Our goals in the study is to assess the impact …
Manipulation Of Genes Involved In Secondary Cell Wall Development During Wood Formation In Poplar, Kavitha Satish Kumar
Manipulation Of Genes Involved In Secondary Cell Wall Development During Wood Formation In Poplar, Kavitha Satish Kumar
Dissertations, Master's Theses and Master's Reports
Lignins are second most abundant components of vascular plant cell walls. They provide plants with structural rigidity and are polymers of monolignols. Lignin polymerization is catalyzed by peroxidases and/or laccases. These enzymes are suggested to share functional overlap and mechanism by which they coordinate this process is not clearly understood. There are about 100 peroxidases and 50 laccase genes known in poplar genome out of which some stem differentiating xylem-specific (SDX) enzymes were selected for our study. The main objective was to genetically manipulate genes expressed in the SDX region in the cell wall to see the effects on lignin …
Quantitative Genetics Of Populus, Roba Bdeir
Quantitative Genetics Of Populus, Roba Bdeir
Dissertations, Master's Theses and Master's Reports
Evidence for bark, stem and stomatal density adaptation to different climates in the model species Populus is seen in both the natural population as well as in the greenhouse, but the genetic basis of these adaptation remains poorly understood. The present thesis investigates bark texture, bark thickness, diameter and stomatal density variations among Populus population using two quantitative genetics methods to attempt understand the genetic system controlling inheritance of these traits and to associate them with respective genes. The first approach aimed at detecting quantitative trait loci (QTL) associated with all phenotypic traits in an interspecific hybrid pedigree (Populus …
Portulaca Oleracea Extract Can Inhibit Nodule Formation Of Colon Cancer Stem Cells By Regulating Gene Expression Of Notch Signal Transduction Pathway, Li Chen
Dissertations, Master's Theses and Master's Reports
The main aim of this study was to investigate the effects of Portulaca oleracea extract on tumor formation in colon cancer stem cells and chemotherapy sensitivity. In addition, this study analyzed the genetic changes within the Notch signal transduction pathway associated with the effects of the extracts. Serum-free cultures of colon cancer cells (HT-29) and HT-29 stem cells were treated with the chemotherapeutic drug 5-FU to assess sensitivity. Injections of the stem cells were also given to BALB/c mice to confirm tumor growth and characteristics. In addition, the effect of different concentrations of P. oleracea extract was tested on the …
Heterologous Expression And Purification Of Full-Length Human Polybromo-1 Protein, Sarah Hopson
Heterologous Expression And Purification Of Full-Length Human Polybromo-1 Protein, Sarah Hopson
Dissertations, Master's Theses and Master's Reports
Over the past decade, it has become apparent that the human polybromo-1 protein (BAF180) has a critical role in cancer. BAF180 is known to be a driver mutation in clear cell renal cell carcinoma, where it has been found to be mutated in approximately 40% of cases. Mutations have also been found in several other cancers, including intrahepatic cholangiocarcinomas and epithelioid sarcomas. BAF180 is the chromatin targeting subunit of the PBAF (Polybromo-associated BRG1-associated factor) chromatin remodeling complex, a role facilitated by its nine domains: six bromodomains, which recognize and bind to acetylated lysines on histones; two BAH (bromo-adjacent homology) domains, …
The Effect Of Posttranslational Modifications On Protein Aggregation, Morphology, And Toxicity, Mu Yang
The Effect Of Posttranslational Modifications On Protein Aggregation, Morphology, And Toxicity, Mu Yang
Dissertations, Master's Theses and Master's Reports
Proteins are one of the most versatile macromolecules in the biological system. The function or activity of a protein highly depends on its 3D native structure. However, under stress, they are at risk of misfolding/aggregation, leading to formation of structures that can indicate loss of function or gain of toxicity. In severe cases, protein aggregation can result in many diseases, including neurodegenerative diseases, such as Alzheimer’s, Parkinson’s, Huntington’s, and amyotrophic lateral sclerosis. Due to the heterogeneous nature of cellular environment and protein molecules, mechanism of in vivo folding and related toxicity still remains elusive. To have a better understanding of …