Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 105 for “"structural diversity"”.
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Sixteen valence-electron species containing boron: structural diversity abounds
[B, C, F, H₂] and [B, N, O, H₂] have been investigated via high level ab initio calculations. Both cyclic and acyclic connectivities have been examined for the singlet state. Chemical intuition suggests a ketene-like structure for each system, with the general form H₂XBY, where X = C or N and Y = F …
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Generating structural diversity in \(\alpha\)[alpha],\(\alpha\)[alpha]-difluoromethyl ketones
This thesis describes attempts to use palladium-catalysed cross-coupling methodology in the synthesis of \(\alpha\),\(\alpha\)-difluoroketones contained within a diverse array of molecular motifs. 1-(\(N\),\(N\)-Diethylcarbamoyloxy)-2,2-difluoro-1-(tributylstannyl)ethene undergoes Stille cross …
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Expanding the structural diversity of the RiPP class of natural products
… of amino acids, RiPP natural products acquire structural diversity ranging from small molecules like microcin C7 to 48-mer polytheonamides with varying post-translational modifications installed by biosynthetic enzymes. These conformational restrictions allow these natural products to exhibit a …
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Nature's approach toward ring formation and structural diversity in ergot alkaloid biosynthesis
… lolii produce ergot alkaloids that have distinct structural features yet share a common tetracyclic ergoline ring scaffold. Mechanistic details regarding the formation of the common ergoline ring are not well understood, though the genes encoding the enzymes that carry out these cyclizations are …
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Expanding the structural diversity of discrete polymers accessible through iterative exponential growth
… IEG architectures (2A/4A/5A), thus expanding the structural diversity and readily accessible substrate scope for atomically defined macromolecules. The configurations of stereogenic centers in IEG-mer backbones are defined by the starting material (R or S epichlorohydrin) and can be further …
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The potential of airborne polarimetric synthetic aperture radar data for quantifying and mapping the biomass and structural diversity of woodlands in semi-arid Australia.
… for quantifying and mapping the biomass and structural diversity of woodlands in semi-arid Australia. Initial investigation focussed on the physical structure of the woodland, which revealed that despite a diversity of woodland associations, the species diversity was relatively low. Both …
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Identifying structural differences in mixed mesophytic and northern hardwood forests on the Monongahela National Forest using remote sensing data
… data and remotely sensed data to evaluate the structural diversity, texture, spectral and spatial differences between forest stands of three age classes (50--69, 70--89, and >90 years) in the Cheat District on the Monongahela National Forest. The structural diversity was determined with …
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A quantitative study of the vegetation of dry and dry-mesic sand prairies in Central and Northwestern Illinois
… thesis focuses on studying the floristic and structural diversity, as well as the possible causes of such diversity, on ten of the remaining high quality dry and dry-mesic sand prairies in Illinois. Values for percent cover of every species in 1-m2 quadrats were obtained for transects at each …
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Discovery and structural characterization of lanthipeptides from soil and rumen bacteria
… products (RiPPs), lanthipeptides possess myriad structural diversity and potential for discovery using genome-guided approaches. Biological activities of interest embedded within lanthipeptide structures include antimicrobial, antiviral, and morphogenetic functions. Continued discovery efforts …
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Creating a climate for success?: Does racial composition matter for undergraduate Latina/o STEM retention?
… Second, I explore the relationship between structural diversity and Latina/o STEM student persistence to degree and find a modest and negative relationship between increases in Latino racial composition at the cohort level and student departure from the university; however, no differences …
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Assessing the Effectiveness of Forest Restoration Efforts in Malawi: A Systematic Review of Successes, Challenges and Lessons Learned
… progress in participatory forest governance, structural diversity restoration, and capacity building. However, significant challenges persist, including inadequate funding, weak law enforcement, insecure land tenure, and limited community involvement during project planning phases. Ecological …
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Molecular characterization of the lipidome by mass spectrometry
… pathways capable of producing an assortment of structurally and functionally distinct lipid species. Despite the structural diversity of lipids being recognized and correlated to specific cellular phenomena and disease states, the molecular mechanisms that underpin this structural diversity …
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APPLICATIONS OF GEDI LIDAR FOR REMOTE SENSING OF FOREST STRUCTURE AND BIODIVERSITY INDICATORS
… of spaceborne lidar for forest integrity and biodiversity monitoring. The three analyses detailed here contribute to our ability to assess forest health as indicated by forest structure and structural diversity and improve our ability to monitor biodiversity using forest structure as a proxy. …
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Using data to characterise the relationship between nanobody sequence, structure and function
… Nb engineering project. First, the sequence and structural diversity of Nb domains is analysed and compared with that observed in a comparative set of Ab domains. Nbs are shown to display greater structural diversity across all three loops, in conjunction with enhanced conservation across the …
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Screening environmental Pseudomonads for characteristics suitable for a bio-engineered oil remediation agent
… limits of biosurfactant activity and potential structural diversity within a phylogenetically related group of bacteria.<br/> A total of 355 pseudomonads and Pseudomonas-like isolates were isolated from activated sludge wastewater and potentially petroleum-contaminated soils from road side …
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Seasonal correlations between Pueraria montana var. lobata and avian species diversity and relative abundance in Hamilton County, Tennessee
… correlations between kudzu and avian species diversity and relative abundance in Hamilton County, Tennessee. By measuring the characteristics of the overstory, midstory, and understory vegetation at sites with differing levels of kudzu coverage, I examined correlations between kudzu density …
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In Vitro Selection and Characterization of Highly Selective Metal -Dependent DNAzymes With Potential Biosensor Applications
… pool may have allowed for more sequence and structural diversity in the initial pool. The DNAzymes examined displayed higher specificity and lower sensitivity for Pb2+ compared to the 8-17 DNAzyme. The sensitivity may be improved through more stringent selection conditions. This work may …
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Avian habitat relationships in the Mojave Desert
… are statistically related to bird species diversity and the density of individual bird species, and what is the affect of neighboring habitat on bird species composition? Three habitat types were surveyed, Larrea scrub, Larrea scrub with Yucca and Opuntia, and Coleogyne scrub with Yucca. …
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Computational prediction of coiled-coil interaction structure specificity
… coiled coil is a protein sequence and structural motif that consists of two or more helices in a parallel or antiparallel orientation supercoiling around a central axis. Coiled coils have been observed in a wide range of protein families, and many studies have focused on their sequence …
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Water and available nitrogen as co-determinants of a mesic savanna in Kruger National Park, South Africa
… (of water and available N) may affect structural diversity in savannas. Rainfall manipulation treatments were set up to simulate different rainfall amounts. These treatments included a wet treatment which received normal rainfall regime plus irrigation( 150 % of rain). The control …
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