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| Titel: |
Effect of gold(III) on the fouling diatom amphora coffeaeformis: Uptake, toxicity and interactions with copper |
| Auteur: |
Robinson, Maurice G. Brown, Leslie N. Hall, Beverley D. |
| Verschenen in: |
Biofouling |
| Paginering: | Jaargang 11 (1997) nr. 1 pagina's 59-79 |
| Jaar: |
1997-02 |
| Inhoud: |
Tetrachloroaurate (AuCl-4) was evaluated for its toxicity to the common marine fouling diatom Amphora coffeaeformis in the presence and absence of the widely used algicide Cu2+. AuCl4- was found to be toxic at concentrations above 0.5 μM, but cells were able to recover at concentrations below 5 M due to cellular and photoreduction of the AuCl4-. In the presence of Cu2+, they did not recover. Other growth effects, such as inoculum level, dark toxicity, and recovery with cysteine, were also examined. Physiological measurements revealed that chlorophyll, photosynthetic rate and thiols were depressed by AuCl4-, and AuCl4- uptake was greater than that of copper at the same ambient concentration. When both AuCl4- and copper were present, the uptake of both metals, but particularly of AuCl4-, was increased. ATP was not required for uptake. Both live and dead cells, as well as their extracellular mucilage, were able to reduce AuCl4- to Au(0) which formed visible grains in and around the cells. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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