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Full-Text Articles in Physical Sciences and Mathematics
Copper And Zinc Tolerance Of Two Tropical Microalgae After Copper Acclimation, Hilary L. Johnson, Jenny L. Stauber, Merrin Adams S, Dianne F. Jolley
Copper And Zinc Tolerance Of Two Tropical Microalgae After Copper Acclimation, Hilary L. Johnson, Jenny L. Stauber, Merrin Adams S, Dianne F. Jolley
Faculty of Science - Papers (Archive)
Current toxicity tests with microalgae are often criticized as being overly sensitive to metals because algae are cultured in metal-deficient media. If such bioassays overestimate copper toxicity in surface waters, the relevance of water quality guidelines derived from these tests is questionable. In this study, the effect of acclimation to copper at environmentally relevant concentrations, on the sensitivity of the marine diatom Nitzschia closterium and the freshwater green alga Chlorella sp. to copper and zinc was examined. N. closterium was acclimated in culture medium containing 5 or 25 g Cu L-1 for 200 days, while Chlorella sp. was acclimated in …
The Importance Of Slime: Does Living In A Community Matrix Save Algal Cells From The Toxic Effects Of Copper?, Jacqueline Levy, Dianne F. Jolley, Jenny L. Stauber
The Importance Of Slime: Does Living In A Community Matrix Save Algal Cells From The Toxic Effects Of Copper?, Jacqueline Levy, Dianne F. Jolley, Jenny L. Stauber
Faculty of Science - Papers (Archive)
Microscopic algae are often used to assess the toxic effects of chemicals to the environment. They are good indicators of ecosystem health because they form the basis of the aquatic food chain and many algal species are sensitive to metals, like copper, at concentrations which occur naturally in the environment. Most toxicity tests with algae use planktonic species, that is, alga that live in the water as free-living species. To date, little research has been done on the toxicity of metals to attached algal species living in a community matrix known as biofilms, because of the difficulties in quantifying changes …
Sensitivity Of Marine Microalgae To Copper: The Effect Of Biotic Factors On Copper Adsorption And Toxicity, Jacqueline Levy, Jenny L. Stauber, Dianne F. Jolley
Sensitivity Of Marine Microalgae To Copper: The Effect Of Biotic Factors On Copper Adsorption And Toxicity, Jacqueline Levy, Jenny L. Stauber, Dianne F. Jolley
Faculty of Science - Papers (Archive)
Microalgae are sensitive indicators of environmental change and, as the basis of most freshwater and marine ecosystems, are widely used in the assessment of risk and development of environmental regulations for metals. However, interspecies differences in sensitivity to metals are not well understood. The relationship between metal-algal cell binding and copper sensitivity of marine microalgae was investigated using a series of 72-h growth-rate inhibition bioassays and short-term (1-h) uptake studies. A range of marine algae from different taxonomic groups were screened to determine whether copper adsorption to the cell membrane was influenced by biotic factors, such as the ultrastructure of …