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 39 for “"Actinomycete"”.
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Genome Mining for Actinomycete Biosynthetic Gene Clusters
Whole-genome sequencing has shown that the large (8-12 Mbp) genomes of Streptomyces and allied genera of Gram-positive filamentous bacteria house a rich and previously underestimated repertoire of gene clusters for biosynthesis of specialised metabolites, including antibiotics, immunosuppressants …
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Degradation of orthochlorophenol by an aquatic actinomycete
… treatment, It has been established that some actinomycetes, especially Streptomyces species, are capable of decomposing a wide variety of aromatic compounds, including phenols, The.purpose of this investigation was to determine the growth characteristics of an aquatic actinomycete and to …
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Soil colonization and drought adaptation of the actinomycete Frankia
A plant bioassay was used to enumerate infectious Frankia in soil and micro- and molecular techniques were used to identify possible mechanisms by which Frankia survive drying.
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Investigating the actinomycete diversity inside the hindgut of an indigenous termite, Microhodotermes viator
Ever since the discovery of a cellulolytic actinomycete inside the gut of a termite, there has been considerable interest in the metabolic abilities and the diversity of these bacteria within this complex environment. However, until fairly recently, most investigations of termite hindguts involved …
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Actinomycete biodiversity assessed by culture-based and metagenomic investigations of three distinct samples in Cape Town, South Africa
… The results provided an explanation for why no actinomycetes were found in the aquatic samples, as all of the sequenced clones were shown to be most closely related to uncultured bacteria. In the terrestrial sample, a total of 120 clones were obtained and all were sent for sequencing.
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The role of actinomycetes in the biodeterioration of wood
The role of actinomycetes in the biodeterioration of wood was reviewed and found to be unclear. Twenty Streptomyces isolates previously isolated from decayed wood were characterised according to the criteria of the International Streptomyces Project. Discrepancies between keys developed for …
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Gene cloning studies in two nocardioform bacteria
Nocardioforms are Gram-positive, aerobic actinomycetes and are a metabolically diverse group which produce antibiotics, useful enzymes, are important in the biotransformation of organic compounds and the decomposition of organic wastes and are important medically. A gene cloning vector designated …
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Biological control studies of Phytophthora Parasitica root rot of boxwood using multiple antagonists
… included six bacteria, five fungi and three actinomycetes. Populations of conidia-forming fungal isolates increased or remained fairly stable when stored in 0.25% suspensions of CMC and MC, indicating that spores may be a more suitable propagule than mycelial fragments when storing fungal …
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The characterisation of actinomycetes isolated from diverse South African sources, with emphasis on the genus Kribbella
Actinomycetes were isolated from the leaves of indigenous plants, aquatic sediment and soil samples, using alternative isolation methods to select for actinomycetes belonging to the rarer genera. Thirty actinomycete strains belonging to the genera Gordonia, Kineococcus, Kribbella, Micromonospora, …
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Investigations into actinomycetes isolated from coastal environments, with a special emphasis on the genus Micromonospora
Marine environments were investigated and actinomycetes were isolated on selective media. Thirty-four (34) actinomycete strains were isolated and identified: 21 Micromonospora strains, 10 Streptomyces strains, and 3 Pseudonocardia strains. A polyphasic approach was employed to determine the novelty …
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The Determination of Oxytetracycline Levels in Soft Tissue, Bone, Blood, and Excreta of Patients Suffering From Malignant Cancer
In 1950 Finlay et al. isolated from soil a new actinomycete, Streptomyces rimosus. which was found to produce an antibiotic substance. This substance, which they named terramycin, showed an Inhibitory action against gram-positive cocci, gram-negative enteric organisms, and aerobic spore-forming …
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The investiation into the synthesis of 2,5-Diphenyloxazole in Streptomyces polyantibioticus SPR
As part of an antibiotic-screening programme, an actinomycete, Streptomyces polyantibioticus SPRT, was isolated from soil collected from the banks of the Umgeni River, KwaZulu-Natal Province, South Africa. It exhibited antibiosis against M. tuberculosis H37RvT, prompting interest in its antibiotic …
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Discovery and Characterization of an Antibiotic from the Soil Bacterium <em>Bacillus</em> sp.
… resistant pathogens. <em>Rhodococcus</em>, an actinomycete related to the prolific antibiotic producing genus <em>Streptomyces</em>, harbors over 30 genes for secondary metabolism that could be involved in antibiotic production. Several antibiotics have already been reported for …
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Isolation and characterisation of antibiotic-producing marine actinomycetes
… for the presence of antibiotic-producing actinomycetes. Of the 67 strains isolated, 26 exhibited antibacterial activity against Mycobacterium aurum A+ and for Enterococcus faecium VanA. These actinomycete strains were physiologically characterised. Three strains showing very strong …
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Generic studies on the oxytetracycline producing organism, Streptomyces alboflavus
The Actinomycete organism, Streptomyces alboflavus, produces the antibiotic oxytetracycline. Treatment with curing agents resulted in S. alboflavus losing the ability to produce oxytetracycline. However, the loss of oxytetracyc1ine production was reversible, and non-producing colonies regained the …
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Pure culture and metagenomic approaches to investigate cellulose and xylan degradation
… characterize cellulases and xylanases from novel actinomycete isolates and the use of metagenomics to uncover previously unidentified cellulase genes was undertaken. Actinomycetes were cultivated from soil samples and the isolate with the best cellulase and xylanase activity was subjected to …
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Conjugation of extrachromosomal replicons of Rhodococcus erythropolis AN12
Bacteria belonging to the Gram-positive actinomycete species, Rhodococcus erythropolis, are diverse not only in terms of metabolic potentials but the plasmids they encode. Pulsed-field gel electrophoresis (PFGE) revealed three previously uncharacterized megaplasmids in the genome of Rhodococcus …
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Assessment and Characterization of Microbial Communities in Salt Affected Soils on Galveston Island
… Agar (bacteria enumeration), Pseudomonas Agar, Actinomycete Agar, and Rose Bengal Agar (fungi enumeration). Bacteria populations ranged from 4.07 to 5.12 log CFU/gram and from 3.73 to 4.26, pseudomonads from 4.09 to 5.21 and from 3.76 to 4.28, actinomycetes from 4.14 to 5.22 and from 3.87 to …
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