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 17 of 17 for “"Ribosomal RNA genes"”.
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Interaction of aflatoxin B1 with the ribosomal RNA genes of rat liver
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nutrition and Food Science, 1983.
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Phylogenetic Relationships of Thermophilic Bacteria
… bacteria in early evolution. The 16S and 23S ribosomal RNA genes from the new bacterial isolates were cloned and sequenced. Several types of analysis on the sequences were used to place these extreme thermophiles in the phylogenetic trees of the eubacterial or archaebacterial kingdoms.
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Bacterial community composition in stream biofilms is influenced by algal response to varying light and phosphorus ratios
… using DNA fingerprinting techniques based on ribosomal RNA genes and the glcD gene. We demonstrated that bacterial community composition changed significantly over the course of biofilm development, and light and phosphorus availability contributed to those differences in community …
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Investigation of a ribosomal RNA operon of Frankia sp. strain AcN14a.
… we have investigated the structure of the ribosomal RNA genes from Frankia sp. strain AcN14a. A genomic library was constructed in EMBL3 and two types of clones, each containing a different set of rRNA genes, were identified by restriction analysis. The rRNA genes of Frankia AcN14a have …
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Computational Discovery and Analysis of rDNA Sequence Heterogeneity in Yeast
Ribosomal RNA genes, known as ribosomal DNA or rDNA, are commonly found in tandem arrays of hundreds of repeating units. The sequences of each unit in an array were thought to be near-identical but it is now known that frequent mutations may occur, causing heterogeneity amongst units. Opposing …
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Phylogenetic Analysis of Iliamna (Malvaceae) Using the Internal Transcribed Spacer Region
… for Iliamna using sequences from the internal transcribed spacer region (ITS) of the nuclear ribosomal RNA genes in order to determine its biogeographical and evolutionary history. Cladistic analysis was performed and the resulting phylogeny is presented. The ITS data provide new insights …
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Isolation And Characterization Of Human Ribosomal Protein Complementary-dnas
… In Escherichia coli the isolation and cloning of ribosomal RNA genes and ribosomal protein genes was a prerequisite to detailed investigations of expression of these genes. Research into ribosome biosynthesis in eukaryotes has lagged behind in part because of the lack of data on the structure of …
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Identifying individual ribosomal RNA gene repeats to investigate their behaviour
Ribosomal RNA forms the major structural and catalytic components of ribosomes. In eukaryotes, the ribosomal RNA genes (rDNA) are present as multiple tandem repeats that are transcribed by a dedicated polymerase, RNA polymerase I. While hundreds of rDNA repeats are present, only a subset is …
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Sequence and Functional Structures of the Extrachromosomal rDNA Minichromosome of Physrum Polycephalum
<p>The ribosomal RNA genes of Physarum polycephalum are encoded on multiple copies of linear, palindromic extrachromosomal DNA molecules (rDNA), which have been isolated both as a satellite DNA molecule, and as a "minichromosome" with associated chromatin proteins. The genes coding for the 19 S, 26 …
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Aspects of the biology of Mya arenaria and Ensis spp. (Mollusca; Bivalvia) in the Irish Sea and adjacent areas
… have affected M. arenaria and E. siliqua gametogenesis at these sites. It was noted that wet weight of E. siliqua dropped significantly in the summer of both 2010 and 2011, after spawning, which may impact on the economic viability of fishing during this period. Additional samples of M. arenaria …
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Molecular analysis of La Crosse virus transcription and replication in host cells
… LAC virus primes transcription of its mRNA by using the scavenged 5' terminal cap and adjacent nucleotides from host mRNA. Previous studies demonstrated that certain 5' nonviral sequences predominated during LAC infection of mosquito cells. To characterize this further, the temporal …
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Exploring the Role of Wolbachia Endobacteria in the Biology of Filarial Nematode Parasites
… reductive evolution could have removed redundant genes or pathways present in both partners. Thus, deletions in the worm's genome would render it dependent on <italic>Wolbachia</italic> for vital gene products. Conversely, <italic>Wolbachia</italic>-dependent species could re-acquire vital genes …
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Development and application of genomic tools for characterising genetic variation in soil-transmitted helminths
… settings. These tests target species-specific ribosomal RNA genes or tandem repetitive regions found throughout the helminth genome. Currently employed qPCR assays were primarily developed and validated using a limited number of geographically restricted parasite isolates. However, it is …
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Analysis of toxic and non-toxic Alexandrium (Dinophyceae) species using ribosomal RNA gene sequences
… of small subunit (Ss) and large subunit (Ls) ribosomal RNA genes (rDNA) from the marine dinoflagellates Alexandrium tamarense, A. catenella, A. fundyense, A. affine, A. minutum, A. lusitanicum and A. andersoni were compared to assess the organisms' relationships. Cultures represent isolates …
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Proteome, transcriptome and metabolome plasticity in closely related strains of Escherichia coli - K12 and its diversity during molecular evolution processes
… two sites due to the W3110 inversion between the ribosomal RNA genes rrnD and rrnE. The rate of nucleotide changes between both the strains is estimated to be relatively low with almost identical genome structures. Hence the following important questions arise: - Is this high degree of similarity …
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Phylogeny and biogeography of Southern African limpets in the genus Siphonaria in the context of a global phylogeny
… Using phylogenetic analyses based on COI and 16S ribosomal RNA genes and incorporating additional GenBank sequences of east coast species, I confirm that S. nigerrima and S. dayi comprise a single species, to be merged under the name S. nigerrima because of its priority, and because examination of …
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Biodiversity and systematics of parasitic Crustacea infesting southern African freshwater fishes
… crustaceans are mostly found attached to the external surfaces of their host. These attachment structures are also adapted to the sites of infestation on their hosts. As a result of the pathological impacts of certain parasitic crustaceans on fish, they have been regarded as species of economic …