Sökning: (WFRF:(Karlsson Per)) srt2:(1990-1999)
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EFFECT OF VANADATE ...
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Karlsson, Jan,1966-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)
(författare)
EFFECT OF VANADATE ON PHOTOSYNTHESIS AND THE ATP ADP RATIO IN LOW-CO2-ADAPTED CHLAMYDOMONAS-REINHARDTII CELLS
- Artikel/kapitelEngelska1994
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LIBRIS-ID:oai:DiVA.org:umu-44649
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-44649URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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We have assessed the effect of vanadate as an inhibitor of plasma-membrane ATPase on photosynthesis and the ATP/ADP ratio in Chlamydomonas reinhardtii CW-92 (a mutant strain lacking a cell wall). This effect was compared in low-CO2-adapted cells grown in media bubbled with air containing 400 or 70 muL . L-1 CO2. Evidence is presented indicating that cells grown at 70 muL . L-1 CO2 have a higher rate of photosynthetic O2 evolution than cells grown at 400 muL . L-1 CO2, at limiting carbon concentrations. Extracellular and intracellular carbonic-anhydrase activities were, however, similar in cells grown in both of the low-carbon conditions. Vanadate inhibited, to a different extent, the HCO3--dependent O2 evolution in cells grown at 400 and 70 muL . L-1 CO2. At 400 muM vanadate, inhibition reached 70-75 % in cells grown at 400 muL . L-1 but only 50 % in those grown at 70 muL . L-1 CO2. The ATP/ADP ratios determined with and without vanadate at limiting concentrations of dissolved inorganic carbon indicated that more ATP was hydrolysed in algae grown at 70 muL . L-1 than in those grown at 400 muL . L-1 CO2. We conclude that the maximal capacity to accumulate dissolved inorganic carbon is inversely related to the CO2 concentration in the medium. Activation and - or synthesis of vanadate-sensitive ATPase may be the major explanation for the higher capacity for HCO3--dependent O2 evolution in cells grown under limited CO2 concentrations.
Ämnesord och genrebeteckningar
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ATPASE
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CARBON CONCENTRATING MECHANISM
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CARBONIC ANHYDRASE
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CHLAMYDOMONAS
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PHOTOSYNTHESIS
Biuppslag (personer, institutioner, konferenser, titlar ...)
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RAMAZANOV, Z
(författare)
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Hiltonen, Thomas,1960-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)thhi0001
(författare)
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Gardeström, Per,1950-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)pega0001
(författare)
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Samuelsson, Göran,1951-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)gosa0002
(författare)
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Umeå universitetInstitutionen för fysiologisk botanik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Planta192:1, s. 46-510032-09351432-2048
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