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Production of transparent exopolymer particles (TEP) in the nitrogen fixing cyanobacterium Anabaena flos-aquae OL-K10

Surosz W., Palińska K.A., Rutkowska A.

Oceanologia

2006

No. 48 (3)

385-394

The aim of the study was to measure the transparent exopolymer particles (TEP) concentration in cultures of Anabaena flos-aquae OL-K10 and to determine the relationship between the quantity of particles produced and the light intensity, the age of the culture and the presence of nitrogen in the culture medium. This is the first time TEP production has been investigated in the Nostocales, an order of nitrogen-fixing phytoplankton species. The results showed that TEP production depends on the presence of nitrogen in the culture medium. The longer the culture is grown, the higher the correlation between its TEP content and its chlorophyll a concentration.

The sorption and removal of heavy metals by algal biomasses

Pawlik-Skowrońska B., Pirszel J., Skowroński T.

Oceanological Studies

1998

Vol. 27, No. 1

91-103

Metal sorption capacity of Chlorella kessleri and two strains of cyanobacteria (Aphanocapsa sp., Anabaena flos-aquae) was studied. It was found that among studied organisms, dead cells of C. kessleri were the most effective sorbents of Pb, Cu, Cd and Zn. They displayed the highest cation-exchange (Cd2+/H+) capacity and bound much more Cd and Zn at pH 7 than at pH 4. The optimum pH for sorption of Pb and Cu was 6. At pH 6, dead cells of C.kessleri could bind maximally about 37 mg Cd, 38 mg Zn, 21 mg Cu and 70 mg Pb per g of dry weight. Generally, algal dead cells (0.3 g dry wt dm^3) removed 50-70% of the metal ions from 0.01 mM solutions. A surplus of calcium and magnesium caused a slight decrease of Pb, Cu, Cd and Zn sorption.