Heavy metal distribution and contamination status in the sedimentary environment of Cochin estuary.

Comparison of elemental composition in two wild and cultured marine fish and potential risks to human health

Bioaccumulation and human health implications of essential and toxic metals in freshwater products of Northeast China

Until recently, there have been only few published reports concerning the use of mangrove macroalgae as biomonitors to assess the estuarine metal contamination. Therefore, the present study was an effort to investigate the biomonitoring of metal contamination using mangrove macroalgae in the tropical Miri estuary of Sarawak, Malaysia. The metal concentrations (Cu, Fe, Mn, and Zn) were determined in the surface sediments, estuarine water, and six dominant macroalgae species that epiphytically grow on mangrove pneumatophores. The results showed that the scheme of metal occurrences in estuarine surface water and sediments was Fe > Mn > Zn > Cu and Fe > Zn > Mn > Cu, respectively. Among the studied metals in algal tissues, irrespective of macroalgal species, the concentration of Fe was found to be the highest. Significant positive correlations were found between Cu and Zn in all macroalgal species (except Caloglossa ogasawaraensis and Dictyota sp.), indicating the common origin of those elements. Concentrations of each of the studied metal in algal tissues varied among macroalgal species, probably because of the differences of structure, age, and growth of thallus among macroalgal species. To our knowledge, this is the first comprehensive report describing the biomonitoring of metal contamination using macroalgae from Malaysian mangrove systems.

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Mangrove Macroalgae as Biomonitors of Heavy Metal Contamination in a Tropical Estuary, Malaysia

Direct determination of Ca, K, Mg, Na, P, S, Fe and Zn in bivalve mollusks by wavelength dispersive X-ray fluorescence (WDXRF) and laser-induced breakdown spectroscopy (LIBS).

Heavy metal concentrations in some gastropods and bivalves collected from the fishing zone of South India.

Background The purpose of this study was to investigate the sterol profiling and predict the pharmacological potential of marine gastropod Telescopium telescopium (T. telescopium), collected from mangrove ecosystem in the South west coast of India. Methods Sterol fractions were separated from the crude lipids using 15% ethyl acetate. Ethyl acetate fractions were dried under ultrahigh purity N2 and analyzed using GC-MS. The biological activity was predicted using the software CLC-Pred; In silico predictions of cytotoxicity for tumor and non-tumor cell lines and PASS. Results This study proved the existence of four sterols, of which cholesterol was abundant. It was found that most of the steroids profiled from T. telescopium displayed activity against reproductive system as well as skin related diseases. Conclusion The predicted anti infertility and skin related activity of the steroids identified from the marine gastropod T. telescopium is useful to attract industrial interest towards this species which will be helpful in rising new combinations with added therapeutic and nutritional worth.

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S.M. Nair

Papers

Heavy metal concentrations in some gastropods and bivalves collected from the fishing zone of South India.

In silico Biological Activity of Steroids from the Marine Gastropods Telescopium telescopium Collected from South West Coast of India.