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 74 for “"barcodes"”.
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Tracking Floral Visitation Using DNA Barcodes
… pollen loads. To assess the utility of plant DNA barcodes for tracking floral visitation, I collected 89 honeybees (Apis mellifera) and 49 bumblebees (Bombus spp.) from a disturbed forest edge in Columbus, Georgia and analyzed their pollen loads using the plastid DNA barcode region rbcL. The …
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Comprehensive Investigation on Content-based Medical Image Retrieval using Radon Barcodes
… techniques such as Binary Coded Decimal Radon Barcodes (BCDRBC), Difference of Radon Projections Barcodes (DRPBC), and Difference of Radon Projections Soft Hash Barcode (DRPSHBC) which decreased both retrieval error and barcode size.
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Password-less two-factor authentication using scannable barcodes on a mobile device
<p>Currently, passwords are the default method used to authenticate users. As hardware continues to advance in speed, breaking these passwords becomes easier. The traditional solution to this problem is ever increasing password complexity and two-factor authentication. However, users become …
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Testing the utility of the consortium for the barcoding of life's two 'agreed upon' plant DNA barcodes, matK and rbcL
… determine their respective utility as plant DNA barcodes. For the direct species identification tests using Prunus, I found that no region alone or in combination was able to discriminate > 50% of species, and noncoding cpDNA regions typically outperformed the Consortium for the Barcode of Life‘s …
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DNA barcoding of forensically important blow flies (Diptera: Calliphoridae) within the Western Cape of South Africa
… species, and this requires the comparison of DNA barcodes to reference data from known species. However, there is a lack of DNA barcode reference data of forensically relevant Calliphoridae species in the Western Cape (South Africa). DNA barcodes were generated for the COI and ITS2 markers for 41 …
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Quantum dot encoded magnetic beads for multiplexed fluorescence biosensing
… strategies were used to make “coloured” barcodes. The first strategy used thiol chemistry to immobilise quantum dots in a layer-by-layer assembly onto magnetic beads whereas the second strategy uses the interaction between quantum dot-biotin and quantum dot-streptavidin conjugates to …
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A high data capacity barcode for mobile phones
… colour 2D barcode known as the MMCC barcode. 1D barcodes are widely used to provide inexpensive and accurate data capture capability. However, due to their low data capacity, they can only function as indexes to back-end databases. The desire for higher data capacity has led to the development of …
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Evolutionary Relationships Among Duiker Antelope (Bovidae: Cephalophinae)
… of their phylogeny. I test the ability of DNA barcodes to identify all taxa within this group. I then use mitochondrial and nuclear genes to estimate a multi-locus species tree and to date divergence times. DNA barcodes are unable to distinguish many sister taxa, calling into question the …
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Scalable development of multiplexed microparticle technologies for optical single-cell barcoding
… are able to scale the number of unique optical barcodes from hundreds to tens of thousands. Using these LP barcodes, we tag thousands of mammalian cells and read out their barcode emissions using a modified microscope and a custom-developed flow cytometer. We expect that the proposed technology …
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Development of multiplexing strategies for electron and super-resolution optical microscopy/
… done through the development of molecular-scale barcodes that can be resolved in one of the two high resolution imaging modes. In the optical domain, the number of colors available in stochastic optical reconstruction microscopy (STORM) will be increased by taking advantage of not only the …
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Microbial profiling using metagenomic assembly
… Using the framework developed for evaluating DNA barcodes in eukaryotes, a study was undertaken to formally evaluate 16S rRNA and cpn60 as DNA barcodes for Bacteria. Both 16S rRNA and cpn60 were found to meet the criteria for DNA barcodes, with cpn60 a preferred barcode based on its superior …
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Determination of a robust metabolic barcoding model for chemotaxonomy in Aizoaceae species : expanding morphological and genetic understanding
… of informative data was established as metabolic barcodes for the identification of the study species. A machine learning algorithm, Random Forest, was used to build a classification model based on the metabolic barcodes which was then trained on various trends from the factors monitored over the …
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Evaluating the Evolutionary and Genetic Relationships of the Andean Orchids of Northwestern Ecuador
… 135 <em>matK</em> and 136 <em>rbcL</em> DNA Barcodes representing over 33 Orchidaceae genera. Sequence analysis shows percent species resolution was higher for <em>matK</em> (98.8%) than <em>rbc</em>L (70.24%), with a large portion of the unresolved species for the <em>rbcL</em> loci coming …
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Structural features of persistent homology and their algorithmic transformations
… homology, and the stability theorem for barcodes. By reformulating these notions in the language of category theory, we can speak more plainly on some recurring notions that are relevant to our discussion. This ultimately sets up for vector space filtrations that prove to be suitable …
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Studying the Clonal Origins of Drug Resistance in Human Breast Cancers
… experiments using high complexity molecular barcodes to trace the fate of individual cellular clones in the development of drug resistance. With this technique, cellular clones can be uncoupled from their genomic backgrounds, giving a new depth to our understanding of clonal selection in …
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Tracing clonal cell plasticity in the microenvironment of pancreatic ductal adenocarcinoma
… epithelial-mesenchymal transition. The assembled barcodes consist of combinations of epitopes attached to a fluorophore and a nuclear-localisation signal, which enables cell sorting, quantitative image analysis, and effective decoding by statistical analysis. Using subcutaneous mouse models of …
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Development of Bioinformatic Tools and Procedures to Computationally Support DNA Barcoding
… were investigated to discover if possible mini-barcodes could be used in order to improve identification in a wide range of plant species. The pipelines developed in the project have also been designed to help the general barcode community in a wide range of areas from forensic analysis, food …
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Design and Detection Process in Chipless RFID Systems Based on a Space-Time-Frequency Technique
… battery or interrogating signal. Compared to barcodes, the chipped tags are expensive because of the existence of the chip. That was why chipless RFID tags are demanded as a cheap candidate for chipped RFID tags and barcodes. As its name expresses, the geometry of the tag acts as both …
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In Situ Perturb-Seq of Transcriptomes and RNA Neural Recordings
… can be applied to enhance the detection of sgRNA barcodes and targeted transcripts. In vitro and in vivo experimental pipelines are proposed for the fusion of these technologies, in this theoretical thesis.
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Metabarcoding pollen to identify allergenic species of grasses (Poaceae) and ragweed (Ambrosia spp.) across six monitored sites in South Africa
… optimal range. Amplification of rbcL and ITS2 barcodes initially produced amplicons of 579 bp and 542 bp, respectively. However, to limit sequencing costs, an alternative set of ITS2 primers producing amplicons were explored. A total of 25 samples progressed to NGS: Cape Town (7), Kimberley …
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