| characterization of a small cryptic plasmid, ppf1, from phormidium foveolarum and vector construction. | the 1509 bp cryptic plasmid, ppf1, from phormidium foveolarum, a strain of filamentous cyanobacteria of the lpp group, was completely sequenced. the ppf1 nucleotide sequence had 97.8% overall similarity with that of a small plasmid from plectonema boryanum. the structural organization of ppf1 and vector construction are discussed. | 1993 | 7764277 |
| replication of filamentous cyanobacterial plasmids, ppf1 from phormidium foveolarum and ppb1 from plectonema boryanum. | single-stranded plasmid dna of ppf1 from phormidium foveolarum that was specifically degraded by s1 nuclease was detected by southern hybridization. this is also the case of the homologous plasmid ppb1 from plectonema boryanum. these observations suggest that such small cryptic plasmids as ppf1 and ppb1, both from gram-negative and filamentous cyanobacteria, replicate by a rolling circle mechanism in their living cells. | 1994 | 7764871 |
| phylogenetic relationships of nonaxenic filamentous cyanobacterial strains based on 16s rrna sequence analysis. | in order to determine the nearly complete 16s rrna gene sequences of cyanobacteria originating from nonaxenic cultures, a cyanobacterium-specific oligonucleotide probe was developed to distinguish polymerase chain reaction (pcr) products of the cyanobacterial rrna operons from those resulting from amplification of contaminating bacteria. using this screening method the 16s rrna genes of four nonaxenic filamentous cyanobacterial strains belonging to the genera leptolyngbya and oscillatoria were c ... | 1996 | 8919871 |
| [physical mapping of plasmid psm1 of the cyanobacterium plectonema boryanum gom. strain calu 465]. | a physical map of plasmid psm1 has been compiled as a result of restriction analysis of pbsmi isolated from the cells of cyanobacterium plectonema boryanum 465. a comparative analysis of the restriction sites localization in dna of plasmid psm1 with site topology of plasmids pgl3 of p. boryanum and ppf1 of phormidium foveolarum indicates to high degree of these plasmids homology. | 2001 | 11692681 |
| petroleum pollutant degradation by surface water microorganisms. | it is well known that the composition of petroleum or some of its processing products changes in the environment mostly under the influence of microorganisms. a series of experiments was conducted in order to define the optimum conditions for an efficient biodegradation of petroleum pollutant, or bioremediation of different segments of the environment. the aim of these investigations was to show to what extent the hydrocarbons of a petroleum pollutant are degraded by microbial cultures which wer ... | 2006 | 17067026 |
| cyanophage pf-wmp4, a t7-like phage infecting the freshwater cyanobacterium phormidium foveolarum: complete genome sequence and dna translocation. | we report the complete 40,938-bp genome sequence of a cyanophage, pf-wmp4, which infects the freshwater cyanobacterium phormidium foveolarum gom. nine of the forty-five potential open reading frames in the pf-wmp4 genome share similarities with the genes found in t7-like phages. using in vitro transcription, we found that seven promoters at the leftmost end of the genome can be recognized by the host rna polymerase. by blocking transcriptional and translational inhibitors, we found that pf-wmp4 ... | 2007 | 17499329 |
| genomic analysis of freshwater cyanophage pf-wmp3 infecting cyanobacterium phormidium foveolarum: the conserved elements for a phage. | cyanophages are ecologically abundant, genetically diverse in aquatic environments, and affect the population and evolutionary trajectories of their hosts. after reporting the cyanophage pf-wmp4 genome (liu et al. in virology 366:28-39, 2007), we hereby present a related cyanophage, pf-wmp3, which also infects the freshwater cyanobacterium phormidium foveolarum. the pf-wmp3 genome contains 43,249 bp with 234 bp direct terminal repeats. the overall genome organization and core genes of the two ph ... | 2008 | 18443848 |
| screening of microalgae for species excreting norharmane, a manifold biologically active indole alkaloid. | a screening of microalgae strains is described, with the objective to discover more species besides the known cyanobacterium nodularia harveyana which excrete the manifold biologically active and co-mutagenic indole alkaloid norharmane (9h-pyrido(3,4-b)indole) into their environment. seven more cyanobacterial species, anabaena cylindrica, anabaena inaequalis, anabaenopsis siamensis, chroococcus minutus, nostoc carneum, nostoc commune and phormidium foveolarum, were newly discovered. the norharma ... | 2008 | 16872816 |
| viability of dried vegetative cells or filaments, survivability and/or reproduction under water and light stress, and following heat and uv exposure in some blue-green and green algae. | vegetative cells in dried, mucilagenous mass of gloeocapsa aeruginosa and aphanothece nidulans, reticulum of hydrodictyon reticulatum, mucilagenous mass of chroococcus minor, and filaments of oedogonium sp. and scytonema hofmanni died within 1/2, 1/2, 1/2, 1, 3 and 6 h, respectively, while dried vegetative filaments of phormidium foveolarum retained under similar storage conditions viability for 4 d. p. foveolarum tolerated 1 mol/l nacl. the resistance to desiccation in p. foveolarum exhibited s ... | 2003 | 14533482 |
| purification and characterization of a novel lectin from a freshwater cyanobacterium, oscillatoria agardhii. | in the survey of 14 species of laboratory-cultured cyanobacteria for hemagglutinins, we newly detected the activity in two species, oscillatoria agardhii, strain nies-204, and phormidium foveolarum, strain nies-503. from the extract of o. agardhii, which showed the highest activity with trypsin-treated erythrocytes of rabbit, a lectin was purified to homogeneity by the combination of precipitation with (nh4)2so4, gel filtration, hydrophobic chromatography and reverse phase chromatography. the pu ... | 2000 | 10817903 |
| sensitivity of macrophyte-dominated freshwater microcosms to chronic levels of the herbicide linuron. i. primary producers. | effects of chronic concentrations of linuron (0, 0.5, 5, 15, 50, and 150 micrograms/l) were studied in indoor, macrophyte dominated, freshwater microcosms. the concentrations were kept at a constant level for 4 weeks. this paper is the first in a series of two and summarizes the course of the linuron concentrations in time and its effects on macrophytes, periphyton, and phytoplankton. these endpoints were studied from 3 weeks before the start of the treatment until 11 weeks after the start. the ... | 1997 | 9352210 |
| uv-b induced differential effect on growth and nitrogen metabolism in two cyanobacteria under copper toxicity. | in the present study, impact of low (uv-b(l): 0.1 μmol m(-2) s(-1)) and high (uv-bh: 1.0 μmol m(-2) s(-1)) fluence rates of ultraviolet-b on growth and nitrogen metabolism in two cyanobacteria: phormidium foveolarum and nostoc muscorum under copper toxicity (2 and 5 μm) was investigated after 24 and 72 h of experiments. copper and uv-bh treatment suppressed growth but more in n. muscorum which was accompanied by significant accumulation of cu. nitrate and nitrite uptake rates and activities of n ... | 2012 | 23273196 |
| differential physiological and biochemical responses of two cyanobacteria nostoc muscorum and phormidium foveolarum against oxyfluorfen and uv-b radiation. | in the present study, degree of tolerance and tolerance strategies of two paddy field cyanobacteria viz. nostoc muscorum and phormidium foveolarum against oxyfluorfen (10 and 20µgml(-1)) and uv-b (7.2kjm(-2)d(-1)) stress were investigated. oxyfluorfen and uv-b decreased growth, photosynthesis, nutrient uptake, nitrate reductase, acid and alkaline phosphatase activities, which accompanied with the increase in the level of oxidative stress. however, growth was more affected in n. muscorum than p. ... | 2011 | 21798597 |