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Environmental Microbiology and Microbial Ecology
School of Biological Sciences: Dissertations, Theses, and Student Research
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- Abscisic acid (1)
- Auxin (1)
- Bacteriophage (1)
- Bacteriophage T4 (1)
- Biogeochemical cycles (1)
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- Biological soil crusts (1)
- Carbohydrate (1)
- Cell-cell signaling (1)
- Cell-cell signaling evolution (1)
- Coccidia (1)
- Contaminant transport (1)
- Eimeria (1)
- Fungi (1)
- Gerbil (1)
- Heavy metals (1)
- Isospora (1)
- Mammalogy (1)
- Melanin (1)
- Meriones (1)
- Microbial interactions (1)
- Microbiology (1)
- Mongolia (1)
- Parasitology (1)
- Phytohormone signaling (1)
- Plant hormone signaling (1)
- Polyextremotolerant fungi (1)
- Protocooperation (1)
- Rodent (1)
- Taxonomy (1)
- Virus (1)
Articles 1 - 5 of 5
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Discovering Novel Polyextremotolerant Fungi, And Determining Their Ecological Role Within The Biological Soil Crust Consortium, Erin Carr
School of Biological Sciences: Dissertations, Theses, and Student Research
The ecological niche of polyextremotolerant fungi within oligotrophic ecosystems such as biological soil crusts has not yet been determined. These fungi persist in locations where nutrients are depleted while simultaneously surrounded by autotrophic microbes such as algae and cyanobacteria. Yet it has not been shown that they are engaging in any exchange of nutrients the way lichens do. However, there is seemingly no other way for these fungi to obtain vital nutrients, such as carbon or nitrogen, other than from these microbes. Here we have isolated polyextremotolerant fungi from cold desert biological soil crusts which are a microbial biofilm that …
Phytohormone Signaling In Chlorella Sorokiniana: Perspectives On The Evolution Of Plant Cell-To-Cell Signaling, Maya Khasin
Phytohormone Signaling In Chlorella Sorokiniana: Perspectives On The Evolution Of Plant Cell-To-Cell Signaling, Maya Khasin
School of Biological Sciences: Dissertations, Theses, and Student Research
Cell-to-cell communication is a key aspect of microbial physiology and population dynamics, and a cornerstone in understanding the evolution of multicellularity. Quorum sensing in bacteria is a canonical example of microbial cell-to-cell signaling, in which bacteria use small molecule signals in order to monitor their population size and modulate their physiology accordingly. We propose that the evolution of plant hormone signaling arose in unicellular green algae, analogously to quorum sensing in bacteria, and that the complexity of these pathways required the recruitment of increasingly specific enzymes to increasingly sophisticated gene networks throughout the course of phytohormone signaling evolution. Using Chlorella …
Biosorption Of Heavy Metals Onto The Surface Of Bacteriophage T4, Zheng Huan Tan
Biosorption Of Heavy Metals Onto The Surface Of Bacteriophage T4, Zheng Huan Tan
School of Biological Sciences: Dissertations, Theses, and Student Research
Biosorption of heavy metals by bacterial and eukaryotic cell surfaces and the subsequent transport in aqueous environments is well recognized. However, very little is known about the roles viruses play in biosorption. Viruses outnumber prokaryotes and eukaryotes in environmental systems. These organisms represent abundant nanoparticulate organic colloids with reactive surfaces. Here we conducted a series of experiments to assess the biosorption potential of Escherichia coli bacteriophage T4. Adsorption of a heavy metal, Zn2+, to the surface of phage T4 was tested in a series of purified phage/metal solutions (0 µM – 1000 µM at 23°C). The Langmuir isotherm …
Coccidia Of Gerbils From Mongolia, Ethan T. Jensen
Coccidia Of Gerbils From Mongolia, Ethan T. Jensen
School of Biological Sciences: Dissertations, Theses, and Student Research
In this study, gerbils collected in the Mongolia over the summers of 2009-2012 were examined for coccidia. In total, 171 gerbils of three species from 22 localities were examined for coccidia. Coccidian oocysts were identified from 21 gerbils, but those found in 1 of those gerbils were probably pseudoparasites of the host from which they were recovered. From the remaining 20 gerbils, 7 morphotypes of Eimeria and 1 morphotype of Isospora were identified. Four of the 7 morphotypes of Eimeria were attributed to new species which were described in this study. In addition, 10 previously described species of Eimeria were …
Growth Of Lactic Acid Bacteria: Infuence Of Protocooperation, Bacteriophage Infection, And Prebiotic Carbohydrates, Caitlin D. Goin
Growth Of Lactic Acid Bacteria: Infuence Of Protocooperation, Bacteriophage Infection, And Prebiotic Carbohydrates, Caitlin D. Goin
School of Biological Sciences: Dissertations, Theses, and Student Research
Lactic acid bacteria are a vital part of the fermented food industry and are the subject of much interest and research. Industry is especially interested in using modern molecular approaches to maintain and improve selected strains; several industrial uses could be improved by closer investigation, namely the protocooperation of S. thermophilus and L. bulgaricus, the role of CRISPRs in phage resistance, and the utilization of prebiotic carbohydrates. Questions such as what genes and pathways are shared during milk fermentation between S. thermophilus and L. bulgaricus, when and what genes are active during bacteriophage infection, and how and where …