Inorganic Carbon Transport and Fixation in Cells of Anabaena variabilis Adapted to Mixotrophic Conditions

Potassium ion transport and electrogenesis in Anabaena variabilis.

Ammonium (methylammonium) transport by heterocysts and vegetative cells of Anabaena variabilis.

Transport of the ammonium analogue [(14)C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH(4)(+) inhibited uptake into the cells and released accumulated methylammonium from the cells. These observations suggest that the main function of ammonium transport in heteroc...

Impact of titanium dioxide nanomaterials on nitrogen fixation rate and intracellular nitrogen storage in Anabaena variabilis.

This study comprehensively investigated the impact of titanium dioxide nanomaterials (nTiO(2)) exposure on cell growth, nitrogen fixation activity, and nitrogen storage dynamics in the primary producer cyanobacteria Anabaena variabilis at various dose concentrations and exposure time lengths. The results indicated that both growth rate (EC(50)-96 h of 0.62 mgTiO(2)/L) and nitrogen fixation acti...

Fructose uptake and influence on growth of and nitrogen fixation by Anabaena variabilis.

Fructose is specifically taken up by nitrogen-fixing cultures of Anabaena variabilis in the light and lowers the doubling time from 24 to 8 h. The kinetics for both fructose-dependent growth and fructose uptake are exponential. The apparent Km for fructose uptake in N2-fixing cultures is 160 microM for cells not previously exposed to fructose and 50 microM in cells adapted to fructose. Picomola...

Photosynthesis and inorganic carbon transport in isolated asparagus mesophyll cells.

The possibility of HCO(3) (-) transport into isolated leaf mesophyll cells of Asparagus sprengeri Regel has been investigated. Measurement of the inorganic carbon pool in these cells over an external pH range 6.2 to 8.0, using the silicone-fluid filtration technique, indicated that the pool was larger than predicted by passive (14)CO(2) distribution, suggesting that HCO(3) (-) as well as CO(2) ...