Impact of ionic aluminium on extracellular phosphatases in acidified lakes.

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077387%3A_____%2F01%3A62013084" target="_blank" >RIV/60077387:_____/01:62013084 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Impact of ionic aluminium on extracellular phosphatases in acidified lakes.
Original language description
Direct inhibiting effects of Al on extracellular phosphatases produced by the plankton were studied in lab experiments. Significant reduction of an apparent substrate affinity was found at Al concentrations 300-1000 g l<sup>-1</sup> at pH 4.5 and 4.8, while maximum acid phosphatase activity (APA) remained unchanged. Such behaviour of saturation kinetics is compatible with the assumption that ionic Al acts as a competitive inhibitor. To decide whether the observed Al effects could be explained alternatively by complexation of Al with substrate, the best fits of data with both possible models was statistically tested. Experimental results supported the competitive hypothesis rather than the complexation model. For pH values <5.2, the results of an Al-pHmatrix experiment gave a more detailed picture: the higher the Al concentration, the wider was the pH range where Al could negatively affect APA. The ecological ramifications of this effect were evaluated in the context of field APA data
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DA - Hydrology and limnology
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2001
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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