Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Fungi are a diverse group of organisms that play crucial roles in various ecological processes and have immense economic importance. Understanding the intricate mechanisms underlying fungal growth and development is fundamental to harnessing their potential and exploring their applications in different fields. Signalling molecules, such as hormones, have been identified as key regulators… more Year: 2023, 2023
Member of: Trent University Graduate Thesis Collection
Abstract: <p>In Ontario, the dominant cash crop rotations consist of soybean (SB), which is a leguminous crop grown in rotation with maize (MZ) and winter wheat (WW). In addition to these crops, some farmers integrate cover crops (CC) into crop rotation, especially during the fallow period and winter seasons, to reduce nitrogen (N) losses via nitrate (NO3-) leaching and emission of N2 and the… more Year: 2023, 2023
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Heated leaf extracts of Euphorbia neriifolia (sweet aloes) are used traditionally in Guyana for asthma therapy, but the phytoconstituents have not been studied and phytohormones are generally unexplored in Euphorbia species. Phytoconstituents in asthma-effective traditional heated extracts were analyzed and compared with unheated leaves and latex extracts as screens to identify candidate… more Year: 2023, 2023
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disorder characterized by progressive loss in function of motor neurons. Elevated levels of biologically important metal ions, such as copper (II) (Cu(II)), zinc (II) (Zn(II)) or iron (III) (Fe(III)), may contribute to the disease. Moreover, Cu(II) interactions with other proteins associated with ALS have been investigated;… more Year: 2022, 2022
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Increased plant size is expected to have negative consequences for mating by increasing pollen transfer among the same plant. However, recent theoretical studies have demonstrated that this may not be true for clonal plants. Instead, clonal expansion could enhance outcrossing opportunities without increasing selfing by reducing distances to potential mates. I investigated how the spatial… more Year: 2022, 2022
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Kennedy , Victoria, Thesis advisor (ths): Saville, Barry, Degree committee member (dgc): Emery, Neil, Degree committee member (dgc): Donaldson, Michael, Degree committee member (dgc): Farrow, Scott, Degree granting institution (dgg): Trent University Abstract: <p>Heavy metal pollution threatens human and ecosystem health. E. gracilis was investigated for its potential use in bioremediation due to its tolerance for heavy metals and ability to sequester them from the environment. E. gracilis can remove metals by producing metal binding compounds enriched in sulfur and nitrogen. In this thesis, E. gracilis cultures that were pretreated with elevated… more Year: 2022, 2022
Member of: Trent University Graduate Thesis Collection
Abstract: <p>During the COVID-19 pandemic, nucleic acid and antibody-based testing methods were heavily relied upon, but can be costly, time-consuming and exhibit high false -negative and -positive rates. Thus, alternative strategies are needed. Viral antigens such as the SARS-CoV-2 spike (S) glycoprotein are critical in the function of the virus and useful as diagnostic biomarkers for viral… more Year: 2021, 2021
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Euglena gracilis is an enigmatic and adaptable organism that has great bioremediationpotential and is best known for its metabolic flexibility. The research done in this
dissertation addresses (1) how growth conditions impact cellular composition, and (2)
how chemometric approaches (such as statistical design of experiments and artificial
neural networks) are viable alternatives to the… more Year: 2020, 2020
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The rapid expansion of the worldwide population has caused an urgent need for the development of new, more environment-conscious, food sources. In this context, algae, such as Euglena, are of interest thanks to their capacity to naturally produce essential nutrients such as proteins and oils commonly found in animals and plant sources. While these processes are currently being… more Year: 2019, 2019
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Cis-isomers of the cytokinin plant hormone family are thought to have low activity or impact on plant growth and development. Mutants with independent silencing of the pathway leading to cis-CK (cis-cytokinin) were investigated at the phenotype and metabolite levels. Phenotypic deviations were noted in trichome development, fresh weight, rosette diameter, number of non-rosette leaves,… more Year: 2019, 2019
Member of: Trent University Graduate Thesis Collection
Abstract: <p>To investigate cytokinins (CKs) in nematodes, CK profiles of a free-living Caenorhabditis elegans and a plant parasitic Heterodera glycines (soybean cyst nematode, SCN) were determined at the egg and larval stages. SCN had higher total CK level than C. elegans; however, CKs in SCN were mostly inactive precursors, whereas C. elegans had more bioactive forms. This is the first study to… more Year: 2018, 2018
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Microalgae are a promising source of valuable compounds relevant to biofuels, biomaterials, nutraceuticals as well as animal and human nutriment. Unfortunately, low cell density and slow growth result in reduced economic feasibility. Heterotrophic cell culturing using an organic carbon source in lieu of light has proven to be an effective alternative to photobioreactors; however, further… more Year: 2018, 2018
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Cytokinins (CKs) are hormones that promote cell division. During the formation of tumors in the Ustilago maydis-Zea mays pathosystem, the levels of CKs are elevated. Although CK levels are increased, the origins of these CKs have not been determined and it is unclear as to whether they promote the formation of tumors. To determine this, we measured the CK levels, identified CK… more Year: 2017, 2017
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Paleczny, Andrea Rose, Thesis advisor (ths): Emery, Neil, Degree committee member (dgc): Yee, Janet, Degree committee member (dgc): Saville, Barry, Degree committee member (dgc): Olechowski, Henry, Degree granting institution (dgg): Trent University Abstract: <p>Cytokinins (CKs) are a family of plant phytohormones responsible for many areas of plant growth and development. There are four free base types of CKs found in higher plants, trans-zeatin (tZ), N6-(∆2-isopentenyl)adenine (iP), cis-Zeatin (cZ) and dihydrozeatin (DZ). CK biosynthesis is regulated by adenosine phosphate-isopentenyltransferase (IPT), which is encoded by a multi-gene family… more Year: 2016, 2016
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Arctic terrestrial ecosystems have experienced substantial structural and compositional changes in response to warming climate in recent decades, especially the expansion of shrub species in Arctic tundra. Climatic and vegetation changes could feedback to the global climate by changing the carbon balance of Arctic tundra. The objective of this thesis was to investigate the influence of… more Year: 2016, 2016
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This study assesses the ability of a unicellular protist, Euglena gracilis, to remove Cu and Ni from solution in mono- and bi-metallic systems. Living Euglena cells and non-living Euglena biomass were examined for their capacity to sorb metal ions. Adsorption isotherms were used in batch systems to describe the kinetic and equilibrium characteristics of metal removal. In living systems… more Year: 2016, 2016
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Based on an endogenous hormone study, three cytokinin type phytohormones; benzyladenine (BA), trans-zeatin (tZ) and methylthiol trans-zeatin (MeSZ), as well as abscisic acid (ABA) were exogenously added at three concentrations (10-7, 10-6 and 10-5 M) to cultures of Chlorella vulgaris in an attempt to alter growth rate, total lipid and fatty acid yields and fatty acid profile. Growth… more Year: 2016, 2016
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The activities of phytohormones during the reproductive phase have been partially clarified in seed physiology while the biological role of plant hormones in oil accumulation during seed development has been investigated in part only. In this research, fatty acid (FA) contents and hormone profiles, including abscisic acid (ABA) and cytokinins (CKs) of seed samples in four different… more Year: 2014, 2014
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Selenium is an essential trace nutrient to many organisms, yet in high concentrations it is toxic. Organic selenium is more bioavailable to aquatic biota than inorganic selenium, but is usually found in much lower concentrations. Algae are known to biotransform inorganic selenium into several organo-selenium compounds, but it is unknown whether any of these bioaccumulate in the food… more Year: 2014, 2014
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Barrett, Sophie Elizabeth, Thesis advisor (ths): Watmough, Shaun, Degree committee member (dgc): Sager, Eric, Degree committee member (dgc): Emery, Neil, Degree committee member (dgc): Hutchinson, Tom, Degree granting institution (dgg): Trent University Abstract: <p>Peatlands are prevalent in the Sudbury, Ontario region. Compared with the well documented devastation to the terrestrial and aquatic ecosystems in this region, relatively little work has been conducted on the peatlands. The objective of this research was to assess factors controlling peat and plant chemistry, and vegetation composition in 18 peatlands in Sudbury after over 30 years of… more
