Export of cadmium and phytochelatin by the marine diatom Thalassiosira weissflogii

Article Abstract:

Cadmium (Cd) is a major pollutant of the aquatic resources. The marine diatom, Thalassiosira weissflogii, has been used to gauge the effects of Cd on the chemistry of natural waters since it produces low molecular weight polypeptides known as phytochelatins in response to Cd stress. At high Cd concentrations, T. weisfloggi produces large amounts of phytochelatin, creating an imbalance between the amount of phytochelatin taken up the cell and amount of phytochelatin exported to the surrounding environment. As a result, half the Cd is exported back to the medium to enable the diatom to survive metal-polluted waters.

Metals, Metals (Materials), Marine pollution

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Control of Cd concentrations in a coastal diatom by interactions among free ionic Cd, Zn, and Mn in seawater

Article Abstract:

The accumulation of cadmium (Cd) and phosphate compounds in sea waters may be directly linked to increased algal uptake and regeneration in these areas. Although the complex factors governing such phenomena has been inadequately explained, it was revealed that Cd ion concentration is directly related to Cd 2+ levels, and inversely proportional to zinc and magnesium ion levels. This correlation provides concrete evidence for the low concentration of algal Cd in coastal bodies where Mn and Zn levels are high.

Research and Development in the Physical, Engineering, and Life Sciences, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Zinc, Cadmium, Water Pollution Control R&D, Causes of, Zinc products, Water pollution, Zinc (Metal), Water pollution research

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Uptake, toxicity, and trophic transfer of mercury in a coastal diatom

Article Abstract:

The accumulation and assimilation of mercury in marine diatoms are controlled by the presence of hydrophobic, neutrally charged mercury and methylmercury complexes in the cell cytoplasm of these organisms. Unlike organic mercury which binds to the cell membranes, methylmercury is easily accumulated in diatoms because it has higher assimilation efficiency and binds more efficiently to the cytoplasm. A bioaccumulation model to predict mercury accumulation and assimilation in fish is discussed.

Research, Bioaccumulation, Mercury, Mercury (Metal)

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