| common evolutionary origin of planktonic and benthic nitrogen-fixing oscillatoriacean cyanobacteria from tropical oceans. | the filamentous cyanobacteria belonging to the genus hydrocoleum (blennothrix) are among the most common mat-forming cyanobacteria in tropical oceans. we present here the evidence that these benthic cyanobacteria are morphologically and phylogenetically very close to the planktonic species of trichodesmium. genetic relationship was established independently with regard to sequences of the 16s rrna gene, nifh gene, and phycocyanin and phycoerythrin intergenic spacers. the species of both genera f ... | 2006 | 16842341 |
| epilithic cyanobacterial communities of a marine tropical beach rock (heron island, great barrier reef): diversity and diazotrophy. | the diversity and nitrogenase activity of epilithic marine microbes in a holocene beach rock (heron island, great barrier reef, australia) with a proposed biological calcification "microbialite" origin were examined. partial 16s rrna gene sequences from the dominant mat (a coherent and layered pink-pigmented community spread over the beach rock) and biofilms (nonstratified, differently pigmented microbial communities of small shallow depressions) were retrieved using denaturing gradient gel elec ... | 2007 | 17416688 |
| natural products chemistry and taxonomy of the marine cyanobacterium blennothrix cantharidosmum. | a papua new guinea field collection of the marine cyanobacterium blennothrix cantharidosmum was investigated for its cytotoxic constituents. bioassay-guided isolation defined the cytotoxic components as the known compounds lyngbyastatins 1 and 3. however, six new acyl proline derivatives, tumonoic acids d-i, plus the known tumonoic acid a were also isolated. their planar structures were defined from nmr and ms data, while their stereostructures followed from a series of chiral chromatographies, ... | 2008 | 18698821 |
| viridamides a and b, lipodepsipeptides with antiprotozoal activity from the marine cyanobacterium oscillatoria nigro-viridis. | parallel chemical and phylogenetic investigation of a marine cyanobacterium from panama led to the isolation of two new pks-nrps-derived compounds, viridamides a and b. their structures were determined by nmr and mass spectroscopic methods, and the absolute configurations assigned by marfey's method and chiral hplc analysis. in addition to six standard, n-methylated amino and hydroxy acids, these metabolites contained the structurally novel 5-methoxydec-9-ynoic acid moiety and an unusual proline ... | 2008 | 18715036 |
| successional changes in bacterial communities during the development of black band disease on the reef coral, montipora hispida. | black band disease (bbd) consists of a mat-forming microbial consortium that migrates across coral colonies causing rapid tissue loss. although bbd-associated microbial communities have been well characterized, little is known regarding how these complex bacterial consortia develop. this study analyzed successional changes in microbial communities leading to the development of bbd. long-term monitoring of tagged corals throughout outbreaks of bbd in the central great barrier reef documented cyan ... | 2010 | 19776765 |
| cyanotoxins are not implicated in the etiology of coral black band disease outbreaks on pelorus island, great barrier reef. | cyanobacterial toxins (i.e. microcystins) produced within the microbial mat of coral black band disease (bbd) have been implicated in disease pathogenicity. this study investigated the presence of toxins within bbd lesions and other cyanobacterial patch (cp) lesions, which, in some instances ( approximately 19%), facilitated the onset of bbd, from an outbreak site at pelorus island on the inshore, central great barrier reef (gbr). cyanobacterial species that dominated the biomass of cp and bbd l ... | 2010 | 20455937 |