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 72 for “"ribosomal DNA"”.
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Silencing and recombination in yeast ribosomal DNA
… for the maintenance and homogenization of rDNA. Eliminating mutations and heterogeneity in rDNA repeats is necessary evolutionarily, but harmful to individual organisms--and has been linked to aging-related pathology. We present a forensic investigation of this process using a new …
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Genetic variation of the ribosomal DNA intergenic spacer of maize
… were assayed for molecular variation in the ribosomal DNA (rDNA) intergenic spacer (IGS) at initial and advanced cycles of selection. RSSSC and RBS10 underwent reciprocal recurrent selection with an inbred tester in a high yield environment, whereas BS10 and BS11 were subjected to full-sib …
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Mentha (Lamiaceae) Phylogenetic Analysis Using Chloroplast TRNL-TRNF and Nuclear Ribosomal DNA ITS Sequences
… the ancestral base chromosome number using DNA sequence data from the chloroplast trnL-trnF and nuclear ribosomal internal transcribed spacer (ITS) regions. Based on trnL-trnF data, Mentha appears monophyletic. However, ITS data place the Mentha species into two distinct clades that include …
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Isolepis R.Br. (Cyperaceae) revisited : a phylogeny based on plastid and nuclear ribosomal DNA data
The approximately 75 species of Isolepis R Br. are currently described as annual or short lived perennials with predominantly terete spikelet's
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Role of topoisomerase I in the stability of the ribosomal DNA of Saccharomyces cerevisiae
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1998.
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Restriction fragment length polymorphism analysis of chloroplast DNA, mitochondrial DNA, and ribosomal DNA in turfgrasses
… length polymorphisms (RFLPs) of chloroplast DNA (cpDNA), mitochondrial DNA (mtDNA), and ribosomal DNA (rDNA), were used to estimate and compare the extent of diversity among the organellar and nuclear genomes, and to infer species relationships. Eight cultivated turfgrass species and …
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Phenotypic and transcriptomic consequences of ribosomal DNA copy number variation in Caenorhabditis elegans and Saccharomyces cerevisiae
Ribosomal DNA (rDNA) forms the template for mature ribosomal RNA (rRNA) and shows considerable sequence conservation through evolution. In eukaryotic genomes rDNA is present in one or more tandem repeat arrays, with copy number variation (CNV) commonly observed in inter- and intra-species …
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Generic concepts in the Crepidotaceae as inferred from nuclear large subunit ribosomal DNA sequences, morphology, and basidiospore dormancy patterns
… were investigated using nuclear large subunit ribosomal DNA (LSU rDNA) sequences. Parsimony analysis of the molecular data supports the Singer classification of Crepidotus, Melanomphalia, and Simocybe as a single monophyletic unit within the Agaricales. The affinities of the genus Tubaria …
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Characterization of prokaryotic diversity in a chlorinated solvent-contaminated bedrock aquifer using denaturing gradient gel electrophoresis, ribosomal DNA sequencing, and real time PCR
… core with a surface-sterilized geology hammer. DNA representing the attached and unattached microbial communities was extracted from these samples, and the 16S rRNA gene was amplified with primers specific for Bacteria, Archaea, sulfate reducers, Geobacteraceae family, Dehalorespirers …
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Genetic analysis of longevity in Saccharomyces cerevisiae
… in yeast is the accumulation of extrachromosomal ribosomal DNA circles (ERCs) in the mother cell nucleus. ERCs are formed by homologous recombination within the ribosomal DNA (rDNA) caused by the presence of a stalled replication fork. Mutation of the replication fork block protein Foblp …
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Using Molecular Diagnostics Based On Internal Transcribed Spacer 2 Sequence To Study Geographical Distribution of Holarctic Malaria Mosquitoes
… the Internal Transcribed Spacer 2 region of the ribosomal DNA is analyzed. Although African Anophelines are very well studied species, there has been no recent significant research for Holarctic Anophelines. In particular, in North America and Eurasia, because of the eradication of malaria in the …
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The molecular systematics of Ulva Linnaeus and Enteromorpha Link (Ulvales, Chlorophyta) from the South Western Cape, South Africa
… These questions are addressed using nuclear ribosomal DNA ITS sequences from 48 local samples plus data on 16 samples from GenBank.
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Human intestinal microbiota and metabolites they produce in relation to host health
… of the 38 strains using amplified ribosomal DNA restriction analysis (ARDRA) into subspecies indicated that of the 38 bifidobacterial strains tested, 34 were designated B. longum subsp. longum and four B. longum subsp. infantis.
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DNA systematic studies in the genus Bromus L. (Poaceae)
Chloroplast and ribosomal DNA restriction endonuclease analyses were used to assess phylogenetic relationships between different subgenera of Bromus, a genus of over 100 diploid and polyploid species. Variation in chloroplast DNA (cpDNA) fragment pattern was examined, initially, in 15 species of …
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Cyperaceae tribe Cyperae : phylogenetic relationships and evolutionary patterns of diagnostic characters
… combined data matrix, which consisted of plastid DNA (rbcL, trnL-F intergenic spacer, and rps16), nuclear ribosomal DNA (internal transcribed spacer ITS) sequences and morphological data. From both analyses, tribe Cypereae were resolved into a very strongly supported clade (Posterior probability …
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Sources of Variation in the Microbiome of Pre-Weaned Dairy Calves
… and age of the calf. Metagenomic analysis 16s ribosomal DNA revealed ten phyla associated with microbiomes of the dam and the same ten phyla associated with calf feces at various time points: Bacteroidetes, Firmicutes, Proteobacteria, Actinobacteria, Cyanobacteria, Verrucomicrobia, …
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Size fractionation of bacterial functional diversity within soils
… utilization following enrichment. Amplified ribosomal DNA (ARDRA) analyses of SC dilution culture enrichments demonstrated distinct bacterial sub-populations from a single soil sample.
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Characteristics of cone-forming cyanobacteria and implications for the origin of conical stromatolites
… identification by genomic analyses of the 16S ribosomal DNA. Through a combination of mixing isolated heterotrophic bacteria and enriched filamentous cyanobacteria communities, we find that heterotrophic bacteria are a determinative factor in the formation and morphology of conical structures. …
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Next-Generation Approaches to Understanding the Diversity and Evolution of Marine Fungi
… Channel using high-throughput sequencing of 18S ribosomal DNA. In addition to characterizing the taxonomic and phylogenetic diversity of planktonic protists, I also estimate the niche breadth of the taxa observed and infer ecological roles and trophic modes to examine if and how functional guilds …
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