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PH-DEPENDENT CADMIUM TRANSPORT INHIBITS PHOTOSYNTHESIS IN THE CYANOBACTERIUM SYNECHOCYSTIS-AQUATILIS
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).ORCID-id: 0000-0001-5900-7395
Vise andre og tillknytning
1993 (engelsk)Inngår i: Environmental and Experimental Botany, ISSN 0098-8472, E-ISSN 1873-7307, Vol. 33, nr 2, s. 331-337Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Short-term (5-120 sec) transport of cadmium (Cd-109) into cells of the unicellular cyanobacterium Synechocystis aquatilis was studied using a rapid filtration technique. The transport was strongly pH-dependent, occurring at pH 7, but not at pH 5.5, and was also observed in long-term (40 min) experiments. For this process the optimum pH was approximately 7.5; uptake was considerably reduced at lower pHs. The entrance of cadmium disturbed photosynthetic activity and related processes. At pH 7, cadmium (8.9 muM) decreased CO2 fixation by about 55%, inhibited carbonic anhydrase activity (completely in intact cells, by 65%, in cell-free extracts) and photosynthetic O2-evolution by about 50%. At pH 5.5 no effects were observed.

sted, utgiver, år, opplag, sider
1993. Vol. 33, nr 2, s. 331-337
Identifikatorer
URN: urn:nbn:se:umu:diva-46913DOI: 10.1016/0098-8472(93)90079-UISI: A1993LA09400014OAI: oai:DiVA.org:umu-46913DiVA, id: diva2:447237
Tilgjengelig fra: 2011-10-11 Laget: 2011-09-16 Sist oppdatert: 2018-06-08

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