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  • 1
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    Nitrogen fixation rate of Unicellular Bacterioplankton from the Atlantic and Pacific (2013)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: Calculated after Luo et al. (2012); Date/Time of event; DEPTH, water; Event label; Hawaiian Islands, North Central Pacific; Latitude of event; Longitude of event; MAREDAT_Diazotrophs_Collection; Nitrogen Fixation (C2H2 Reduction); Nitrogen fixation rate, total; Salinity; Temperature, water; TNA2002-04-11; TNA2002-04-15; TNA2002-04-18; TNP2002-09-23; TNP2002-09-24; TNP2002-09-27; Tropical Atlantic; Unicellular cyanobacteria, nitrogen fixation rate; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 96 data points
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  • 2
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    Abundance and calculated biomass of Trichodesmium in coastal waters of Tanzania: diversity, seasonality, nitrogen and carbon fixation (2013)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Keywords: Calculated after Luo et al. (2012); Date/Time of event; DEPTH, water; Diazotrophs, total biomass as carbon; Event label; Latitude of event; Light microscope; Longitude of event; MAREDAT_Diazotrophs_Collection; Nitrate; Phosphate; Salinity; Temperature, water; Trichodesmium, biomass as carbon; Trichodesmium, carbon per trichome; Trichodesmium abundance, total; Zanzibar Channel; ZC/SiteD_1975-01-15; ZC/SiteD_1975-02-15; ZC/SiteD_1975-03-15; ZC/SiteD_1975-04-15; ZC/SiteD_1975-05-15; ZC/SiteD_1975-06-15; ZC/SiteD_1975-07-15; ZC/SiteD_1975-08-15; ZC/SiteD_1975-09-15; ZC/SiteD_1975-10-15; ZC/SiteD_1975-11-15; ZC/SiteD_1975-12-15; ZC/SiteD_1976-01-15; ZC/SiteZ_1993-01-15; ZC/SiteZ_1993-02-15; ZC/SiteZ_1993-03-15; ZC/SiteZ_1993-04-15; ZC/SiteZ_1993-05-15; ZC/SiteZ_1993-06-15; ZC/SiteZ_1993-07-15; ZC/SiteZ_1993-08-15; ZC/SiteZ_1993-09-15; ZC/SiteZ_1993-10-15; ZC/SiteZ_1993-11-15; ZC/SiteZ_1993-12-15; ZC/SiteZ_1994-01-15; ZC/SiteZ_1994-04-15; ZC/SiteZ_1994-05-15; ZC/SiteZ_1994-06-15; ZC/SiteZ_1994-07-15; ZC/SiteZ_1994-08-15; ZC/SiteZ_1994-09-15; ZC/SiteZ_1994-10-15; ZC/SiteZ_1994-11-15; ZC/SiteZ_1994-12-15; ZC/SiteZ_1995-01-15; ZC/SiteZ_1995-02-15; ZC/SiteZ_1995-03-15; ZC/SiteZ_1998-01-15; ZC/SiteZ_1998-02-15; ZC/SiteZ_1998-03-15; ZC/SiteZ_1998-04-15; ZC/SiteZ_1998-05-15; ZC/SiteZ_1998-06-15; ZC/SiteZ_1998-07-15; ZC/SiteZ_1998-08-15; ZC/SiteZ_1998-09-15; ZC/SiteZ_1998-10-15; ZC/SiteZ_1998-11-15; ZC/SiteZ_1998-12-15
    Type: Dataset
    Format: text/tab-separated-values, 571 data points
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  • 3
    Electronic Resource
    Electronic Resource
    The Nostoc-Gunnera symbiosis: carbon fixation and translocation (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The in vitro specific activity of ribulose-1,5-bisphosphate carboxylase (Rubisco; EC 4. 1. 1. 39) and the dark and light in vivo CO2 fixation activities were determined in the cyanobiont of Gunnera. Compared to the free-living isolate Nostoc PCC 9231, the in vitro Rubisco activity was high, while the in vivo CO2 fixation was very low. Light did not significantly influence CO2 fixation if the cyanobiont was left in the sliced Gunnera tissues, while a small light stimulation was found for CO2 fixation of the freshly-isolated cyanobiont. The adjacent non-infected Gunnera tissue showed a very low CO2 fixation. A rapid translocation of fixed 14CO2 from leaves towards apical parts of the plant was apparent, in particular to the symbiotic tissue. The 14C label appeared mainly in soluble form in this tissue and was rapidly catabolised as shown by 14C chase experiments. Also, short-term experiments revealed that maximum 14C accumulation occurred in the symbiotic tissue showing the highest rates of nitrogen fixation (Söderbäck et al. 1990), about 10–15 mm from the plant apex. The data were taken to indicate that there is a modification in the photosynthetic light reaction of the cyanobiont and that the cyanobiont lives heterotrophically in the dark on photo-synthate rapidly delivered from nearby leaves of the host plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb01795.x
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  • 4
    Electronic Resource
    Electronic Resource
    Glycolate metabolism in cyanobacteria (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 75 (1989), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The mechanism for uptake of glycolate in the cyanobacterium Anabaena 7120 and its capacity to metabolize glycolate were examined. The uptake of [14C]-glycolate in light, at pH 7, consisted of an initial rapid phase (≤60s) and a second slower phase. The latter obviously represents metabolism as the glycolate dehydrogenase inhibitor 2-pyridylhydroxymethanesulfonic acid (HPMS) did not affect the initial uptake phase while the second phase was strongly reduced. The sulfhydryl reagent N-ethylmaleimide (NEM) inhibited uptake of glycolate and the uptake was reduced by lactate, glycerate and glyoxylate, Treatment with triphenylmethylphosphonium (TPMP+), a lipophilic cation collapsing ΔΨ only slightly reduced the uptake of glycolate. At pH 7.0, the F0F1-ATPase inhibitor N, N′-dicyclohexylcarbodiimide (DCCD) and the uncoupler carbonylcyanide m-chlorophenylhydrazone (CCCP) abolished the uptake. Inhibition of photophosphorylation by dark-treatment and presence of 3-(3′,4′-dichlorophenyl)-1, 1-dimethylurea (DCMU) also reduced the uptake. Decreasing the pH in the range of 10 to 5.5 increased the uptake. In contrast to the situation at pH 7. CCCP did not affect the initial glycolate uptake at pH 5.5. We conclude that the uptake of glycolate is a carrier-mediated process which, at pH 7, is dependent on a H+-ATPase to create the ΔpH across the membranes needed for uptake, while at pH 5.5 the uptake of glycolate is not ATP-dependent. The capacity to metabolize glycolate was at least 50 μmol (mg chl a)−1 h−1 in young cultures. In older cultures the rate was nearly 50% lower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1989.tb06161.x
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  • 5
    Electronic Resource
    Electronic Resource
    Cloning and expression of a putative cyclodextrin glucosyltransferase from the symbiotically competent cyanobacterium Nostoc sp. PCC 9229 (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 219 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A polymerase chain reaction-based method was used to isolate a Nostoc sp. PCC 9229 cDNA from infected glands of Gunnera chilensis. The complete gene sequence was isolated from a genomic Nostoc sp. PCC 9229 library. Sequence analysis showed 84% amino acid similarity to a putative cyclodextrin glycosyltransferase from Nostoc sp. PCC 7120 and the gene was therefore termed cgt. Southern blot revealed that the cgt gene was present in symbiotically competent cyanobacteria. The cgt gene was expressed in free-living nitrogen-fixing cultures in light or in darkness when supplemented with fructose. This is the first expression analysis of a cgt gene from a cyanobacterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(02)01204-1
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrastructural and chemical assessment of poly-β-hydroxybutyric acid in the marine cyanobacterium Trichodesmium thiebautii (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 94 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract We report here on the occurrence and quantities of poly-β-hydroxybutyric acid (PHB) in natural populations of the marine cyanobacterium Trichodesmium thiebautii. A diurnal variation in the shape and size of PHB granules and in PHB content was observed. The highest PHB levels (2.3 ± 0.8 mg g−1 dry wt) were recorded in the early morning and the values decreased thereafter with a minimum at night (1.6 ± 0.9 mg g−1 dry wt). Our data suggest that PHB is a prominent cell constituent in T. thiebautii and that its synthesis takes place in the early morning whereas it is utilized during the rest of the day.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05304.x
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  • 7
    Electronic Resource
    Electronic Resource
    The presence and expression of hetR in the non-heterocystous cyanobacterium Symploca PCC 8002 (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 168 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The filamentous cyanobacteria Symploca PCC 8002 (Symploca) and Trichodesmium spp. fix nitrogen aerobically in the light in a light/dark cycle, without forming specialized thick-walled cells (heterocysts). Even though they do not form heterocysts, we amplified and sequenced a segment of a key regulatory gene in heterocyst differentiation, the hetR gene, from Symploca, Trichodesmium erythraeum and Leptolyngbya PCC 73110 (which fixes nitrogen anaerobically) using degenerate oligonucleotides. The transcriptional level of hetR in Symploca PCC 8002 was examined in relation to nifH expression during nitrogen step-down. The expression pattern of hetR suggests that it was not induced during removal of combined nitrogen, as is the case with the heterocystous cyanobacteria. This is the first report of sequences corresponding to a portion of hetR from within the group of non-heterocystous cyanobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb13270.x
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  • 8
    Electronic Resource
    Electronic Resource
    The Nostoc-Nephroma symbiosis: localization, distribution pattern and levels of key proteins involved in nitrogen and carbon metabolism of the cyanobiont (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 77 (1989), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The qualitative distribution and quantitative estimates of nitrogenase (EC 1.7.99.2), glutamine synthetase (EC 6.3.1.2), phycoerythrin and ribulose 1,5-bisphosphate carboxylase/oxygenase (EC 4.1.1.39) were studied in the cyanobacterium Nostoc residing in internal cephalodia of the tripartite lichen Nephroma arcticum L. Polyclonal antisera, raised in rabbit against the proteins, and goat anti-rabbit IgG conjugated to 10 nm gold were used as probes to detect the antigens by transmission electron microscopy. Western blot analyses demonstrated the monospecificity of the antisera. Nitrogenase was localized in heterocysts, with vegetative cells showing a label intensity comparable to the background. Distribution of the antigen within the heterocysts was uniform. Glutamine synthetase labelling was very low, but appeared to be distributed in both cell types. An intense phycoerythrin labelling was associated with the thylakoid region of the vegetative cells, whereas a much lower labelling was observed in the heterocyst. No significant differences were found between cyanobionts in younger and older cephalodia except for the nitrogenase labelling, which was higher in heterocysts of the cyanobiont in younger cephalodia. Most of the ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) label was present in vegetative cells. The Rubisco label was pronounced in the carboxysomes, whereas the label in the cytoplasm, on a unit area basis, was much lower. Heterocysts showed a label intensity similar to that of the vegetative cell cytoplasm. In Nostoc of the bipartite lichen Peltigera canina L., the Rubisco protein showed a comparable distribution pattern, but the average number of carboxysomes per vegetative cell was about 4 times higher.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1989.tb04972.x
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  • 9
    Electronic Resource
    Electronic Resource
    Physiological and structural responses of the cyanobacterium Anabaena cylindrica to aluminium (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 63 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When adding aluminium (3.7–370 μM) as AlCl3–6H20 to cultures of the nitrogen-fixing cyanobacterium Anabaena cylindrica, strain 1403/2a (CCAP), the following responses were observed: The effects of aluminium were dependent on pH. being most drastic at pH 6.0. At this pH the growth of A. cylindrica was significantly reduced by 3.7 μM aluminium and completely inhibited by 370 μM. The content of chlorophyll a and phycocyanin decreased after treatment with aluminium. Also, aluminium lowered the rates of both CO2-fixation and N2-fixation with total inhibition of both processes by 370 μM. At the lower concentrations used the nitrogenase activity started to recover after about 100 h. The aluminium content in the cells increased with increasing concentration and with time. At 190 μM the aluminium concentration in the cells represented 2.4 and 3.3% of the dry weight after 6 and 24 h, respectively. Clogging of filaments and lysis of vegetative cells were apparent at higher aluminium concentrations while the frequency of heterocysts increased in all concentrations used. The most pronounced ultrastructural changes included accumulation of cyanophycin granules and degradation of the thylakoids. The ultrastructure of the heterocysts was however not affected. It is concluded that major reasons for the toxicity are interactions with membranes and phosphate deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb01895.x
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  • 10
    Electronic Resource
    Electronic Resource
    The Nostoc-Gunnera magellanica symbiosis: Phycobiliproteins, carboxysomes and Rubisco in the cyanobiont (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 84 (1992), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the nitrogen fixing symbiosis between Nostoc and the angiosperm Gunnera, the cyanobiont is found in stem glands and is thought to have a heterotrophic mode of nutrition. To investigate whether the photosynthetic machinery in the cyanobiont is down-regulated in the symbiosis, the presence of the phycobiliproteins, phycoerythrin and phycocyanin, and ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco, EC 4.1.1.39) in cyanobionts of Gunnera magellanica Lam. and in a free-living (cultured) isolate of the cyanobacterium was studied by immunoelectron microscopy. Carboxysomes were numerous in all vegetative cells (ca 3.5 per cell section), and on an area basis they showed a high Rubisco label compared to the cytoplasm; but recalculation on a volume basis demonstrated that the carboxysomal fraction of Rubisco decreased in the cyanobiont along the plant stem. Along the whole Gunnera stem both types of phycobiliproteins were present in the symbiotic Nostoc and in amounts equivalent to or above those detected in the free-living isolate. As the symbiotic Nostoc is located intracellularly, out of reach of light in the plant stem, the findings indicate a lack of regulation of the photosynthetic protein synthesis in the symbiotic state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1992.tb04686.x
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