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Uptake of cadmium and zinc by the alga Chlorella vulgaris: II. Multi-ion situation (1991)

Ting, Y. P. ; Prince, I.G. ; Lawson, F.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 37 (1991), S. 445-455

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ISSN: 0006-3592

Keywords: synergism antagonism ; metal uptake ; Chlorella vulgaris ; cadmium ; zinc ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Many microorganisms are capable of sequestering and concentrating heavy metals from their aqueous environment. While much research has beep carried out on the uptake of single species of metal ions, little attention seems to have been given to the study of multimetal ion systems. A mathematical model has previously been developed to describe the uptake of individual metal species by a microorganism. The model proposes two sequential processes: an initial rapid uptake due to cellular surface adsorption and a subsequent slow uptake due to membrane transport of the metal into the cells. This article extends the treatment by considering the uptake of two metal species together, cadmium and zinc, under different experimental conditions. The results are discussed in terms of possible mechanistic interactions.

Additional Material: 11 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bit.260370506

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Gold uptake by Chlorella vulgaris (1995)

Ting, Y. P. ; Teo, W. K. ; Soh, C. Y.

Springer

Journal of applied phycology 7 (1995), S. 97-100

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ISSN: 1573-5176

Keywords: gold ; Chlorella vulgaris ; physical/chemical treatment ; carboxyl ; FTIR ; XPS ; X-ray photoelectron spectroscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract This paper describes a study on the uptake of gold (III) ions by viable and treated cells of the unicellular alga, Chlorella vulgaris. Inactivating the algal cells by various physical/chemical treatments resulted in a considerable enhancement in the uptake capacity over the pristine cells. X-ray Photoelectron Spectroscopy (XPS) analyses confirmed the deposition of elemental gold, Au (O), on the cell surface, indicating that a reduction process has taken place. XPS results also suggested an increase in the oxidized carbon species, carboxyl species in particular, on the surfaces of the treated cells. FTIR spectroscopy results revealed that the carboxyl group was involved mainly in the binding of the gold on the surface of both the viable and treated cells.