Frida Hellblom - Academia.edu (original) (raw)

Frida Hellblom

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Papers by Frida Hellblom

Research paper thumbnail of A buffer sensitive inorganic carbon utilisation system in Zostera marina

Research paper thumbnail of External HCO(3) (-) dehydration maintained by acid zones in the plasma membrane is an important component of the photosynthetic carbon uptake in Ruppia cirrhosa

Photosynthesis research, 2003

Ruppia cirrhosa, a temperate seagrass growing in brackish water, featured a high capacity for HCO... more Ruppia cirrhosa, a temperate seagrass growing in brackish water, featured a high capacity for HCO(3) (-) utilisation, which could operate over a wide pH range (from 7.5 up to 9.5) with maintained efficiency. Tris buffer inhibited this means of HCO(3) (-) utilisation in a competitive manner, while addition of acetazolamide, an inhibitor of extracellular carbonic anhydrase activity, caused a 40-50% inhibition. A mechanism involving periplasmic carbonic anhydrase-catalysed HCO(3) (-) dehydration in acid zones, followed by a (probably diffusive) transport of the formed CO(2) across the plasma membrane was thus, at least partly, responsible for the HCO(3) (-) utilisation. This mechanism, which comprises a CO(2)-concentrating mechanism (CCM) associated with the plasma membrane, is thus shown for the first time in an aquatic angiosperm. Additional mechanisms involved in the Tris-sensitive HCO(3) (-) utilisation could be direct HCO(3) (-) uptake (e.g., in an H(+)/HCO(3) (-)symport) or (more...

Research paper thumbnail of A buffer sensitive inorganic carbon utilisation system in Zostera marina

Research paper thumbnail of External HCO(3) (-) dehydration maintained by acid zones in the plasma membrane is an important component of the photosynthetic carbon uptake in Ruppia cirrhosa

Photosynthesis research, 2003

Ruppia cirrhosa, a temperate seagrass growing in brackish water, featured a high capacity for HCO... more Ruppia cirrhosa, a temperate seagrass growing in brackish water, featured a high capacity for HCO(3) (-) utilisation, which could operate over a wide pH range (from 7.5 up to 9.5) with maintained efficiency. Tris buffer inhibited this means of HCO(3) (-) utilisation in a competitive manner, while addition of acetazolamide, an inhibitor of extracellular carbonic anhydrase activity, caused a 40-50% inhibition. A mechanism involving periplasmic carbonic anhydrase-catalysed HCO(3) (-) dehydration in acid zones, followed by a (probably diffusive) transport of the formed CO(2) across the plasma membrane was thus, at least partly, responsible for the HCO(3) (-) utilisation. This mechanism, which comprises a CO(2)-concentrating mechanism (CCM) associated with the plasma membrane, is thus shown for the first time in an aquatic angiosperm. Additional mechanisms involved in the Tris-sensitive HCO(3) (-) utilisation could be direct HCO(3) (-) uptake (e.g., in an H(+)/HCO(3) (-)symport) or (more...

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