| cellular fatty acid composition of cyanobacteria assigned to subsection ii, order pleurocapsales. | the cellular fatty acid composition of five of the six genera of unicellular cyanobacteria in subsection ii, pleurocapsales (dermocarpa, xenococcus, dermocarpella, myxosarcina and the pleurocapsa assemblage) contained high proportions of saturated straight-chain fatty acids (26-41% of the total) and unsaturated straight chains (40-67%). isomers of 16:1 were the main monounsaturated acid component (11-59%). polyunsaturated acids were present at trace levels (0-1% or less) in xenococcus and myxosa ... | 2000 | 10843042 |
| infectious diseases in mazzaella laminarioides (rhodophyta): estimating the effect of infections on host reproductive potential. | very little is known about the potential effects of endophytic infections on the host in algae, especially in terms of fitness. in this study, we report a first attempt at quantifying the effects of the endophytes endophyton ramosum (chlorophyta) and pleurocapsa sp. (cyanophyta) on the reproductive potential of their host mazzaella laminarioides (rhodophyta). density of reproductive structures and spore germination rates was compared between infected and non-infected fronds. it was found that di ... | 2000 | 11023253 |
| hydrocarbon accumulation by picocyanobacteria from the arabian gulf. | the objective of this work was to study picocyanobacteria in the arabian gulf water in relation to oil pollution. | 2001 | 11556921 |
| novel psba1 gene from a naturally occurring atrazine-resistant cyanobacterial isolate. | a naturally occurring atrazine-resistant cyanobacterial isolate, strain sg2, was isolated from an atrazine-containing wastewater treatment system at the syngenta atrazine production facility in st. gabriel, la. strain sg2 was resistant to 1,000 microg of atrazine per ml but showed relatively low resistance to diuron [3-(3,4-dichlorophenyl)-1,1-dimethyl urea]. analyses of 16s ribosomal dna indicated that strain sg2 falls into the synechocystis/pleurocapsa/microcystis group. photosynthetically dri ... | 2002 | 11872488 |
| microbial diversity of extant stromatolites in the hypersaline marine environment of shark bay, australia. | stromatolites have been present on earth, at various levels of distribution and diversity, for more than 3 billion years. today, the best examples of stromatolites forming in hypersaline marine environments are in hamelin pool at shark bay, western australia. despite their evolutionary significance, little is known about their associated microbial communities. using a polyphasic approach of culture-dependent and culture-independent methods, we report the discovery of a wide range of microorganis ... | 2004 | 15344935 |
| community phylogenetic analysis of moderately thermophilic cyanobacterial mats from china, the philippines and thailand. | most community molecular studies of thermophilic cyanobacterial mats to date have focused on synechococcus occurring at temperatures of approximately 50-65 degrees c. these reveal that molecular diversity exceeds that indicated by morphology, and that phylogeographic lineages exist. the moderately thermophilic and generally filamentous cyanobacterial mat communities occurring at lower temperatures have not previously been investigated at the community molecular level. here we report community di ... | 2005 | 15970994 |
| characterization of functional bacterial groups in a hypersaline microbial mat community (salins-de-giraud, camargue, france). | a photosynthetic microbial mat was investigated in a large pond of a mediterranean saltern (salins-de-giraud, camargue, france) having water salinity from 70 per thousand to 150 per thousand (w/v). analysis of characteristic biomarkers (e.g., major microbial fatty acids, hydrocarbons, alcohols and alkenones) revealed that cyanobacteria were the major component of the pond, in addition to diatoms and other algae. functional bacterial groups involved in the sulfur cycle could be correlated to thes ... | 2004 | 16329855 |
| paleopleurocapsa wopfnerii gen. et sp. nov.: a late precambrian alga and its modern counterpart. | silicified dolomite of the approximately one billion year old skillogalee dolomite of the adelaide geosyncline, south australia, contains organically preserved microfossils of a structurally complex, crustose pleurocapsalean cyanophyte, herein described as paleopleurocapsa wopfnerii. although actual cell contents have been degraded, lamellar sheath material faithfully preserves the morphology of the alga. comparison with specimens of the modern genus pleurocapsa thuret demonstrates affinities at ... | 1975 | 16592257 |
| [chromatin morphology and cytokinesis in pleurocapsalean cyanobacteria]. | by means of differential interference contrast (dic) and fluorescence microscopy, chromatin morphology and cytokinesis have been described in the cyanobacterium pleurocapsa sp. calu 1126 capable of multiple fission (multiple reproduction of the mother cell, the macrocyte, with formation of unique reproductive cells, the baeocytes). two kinds of chromatin behavior have been revealed in the cell cycle: 1) the formation of numerous chromatin areas before their compartmentalization by multiple fissi ... | 2007 | 18217367 |
| [baeocytes in the cyanobacterium pleurocapsa sp.: characterization of the differentiated cells produced by multiple fission]. | electron microscopy of cyanobacteria pleurocapsa sp. calu 1126 revealed that multiple fission proceeds by successive binary fissions. the cultivation conditions were determined when the number of baeocytes (products of multiple fission) was comparable with that of macrocytes (products of binary fission), and cell sorting was achieved for the first time. juvenile baeocytes were shown to differ from macrocytes in: (1) the absence of sheath; (2) the linear-peripheral configuration of their lamellar ... | 2008 | 18365724 |
| reproducing stone monument photosynthetic-based colonization under laboratory conditions. | in order to understand the biodeterioration process occurring on stone monuments, we analyzed the microbial communities involved in these processes and studied their ability to colonize stones under controlled laboratory experiments. in this study, a natural green biofilm from a limestone monument was cultivated, inoculated on stone probes of the same lithotype and incubated in a laboratory chamber. this incubation system, which exposes stone samples to intermittently sprinkling water, allowed t ... | 2008 | 18768211 |