Variation of microcystins, cyanobacterial hepatotoxins, in Anabaena spp. as a function of growth stimuli

Article Abstract:

A laboratory experiment was performed on cyanobacterial hepatotoxins, microcystins, to determine the significance of external growth stimuli in controling the levels and relative proportions of various microcystin variants in two strains of filamentous, nitrogen-fixing Anabaena spp. Findings indicated that the reduction of phosphorus loads in bodies of water may be used in preventing the health hazards that toxic cyanobacterial water blooms pose, not only by reducing the cyanobacteria but also by reducing their toxic content.

Microbial toxins

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Dissolved nitrogen uptake by a cyanobacterial bloom (Anabaena flos-aquae) ina subartic lake

Article Abstract:

Dissolved nitrogen uptake by natural populations of the cyanobacteria Anabaena flos-aquae is discussed. Tracer, nitrogen fixation, time-series and ancillary analysis experiments were conducted on concentrations of A. flos- aquae. Results indicate that biomass, temperature and light restrict uptake rates. It was also determined that regeneration is the main source of nitrogen for the growth of cyanobacteria.

Biochemical oxygen demand, Freshwater algae

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Stable carbon isotope evidence for atmospheric CO2 uptake by cyanobacterial surface scums in a eutrophic lake

Article Abstract:

The ability of cyanobacterial surface scums to initiate atmospheric CO2 uptake in a eutrophic lake is investigated by analyzing the carbon isotope composition of photosynthetic organisms in the lake. Results indicate that cyanobacterial surface scums fix atmospheric CO2 directly at very high chlorophyll concentrations.

Marine microbiology

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