Goh Pi Lee,Beverly
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Publication Effects of the heavy metals copper and zinc on zooxanthellae cells in culture(1997) Goh, B.P.L.; Chou, L.M.; TROPICAL MARINE SCIENCE INSTITUTE; BIOLOGICAL SCIENCESThe growth of symbiotic algal cells (zooxanthellae) isolated from the coral, Montipora verrucosa under the influence of the heavy metals copper (Cu) and Zinc (Zn) was investigated. Zooxanthellae cells cultured in f/2 enriched seawater medium were subjected to a maximum Cu level of 42μg.l-1, Zn concentration of 509μg.l-1, and various combinations of the two metals, in ecotoxicological bioassays lasting up to 28 days. A Cu level of 40μg.l-1 caused significantly depressed specific growth rates of cell cultures obtained using a standard growth model. Low concentrations of the metals Cu and Zn in combination elicited synergistic effects of sublethal toxicity. The use of cultured zooxanthellae cells in bioassays investigating sublethal effects of heavy metal stress has relevant applications in the field of pollution monitoring.Publication Heavy metal levels in marine sediments of Singapore(1997) Goh, B.P.L.; Chou, L.M.; TROPICAL MARINE SCIENCE INSTITUTE; BIOLOGICAL SCIENCESMarine environmental levels of the metals copper (Cu), zinc (Zn), lead (Pb) and cadmium (Cd) were measured from sediments collected around 20 coastal locations around Singapore, over a 2-year period. Sediment-size analysis was conducted on sediment samples, and Atomic Absorption Spectrophotometry was used in the analyses of sediment heavy metal concentrations. The levels of heavy metals in marine sediment was largely dependant on sediment particle size, as illustrated by the correlation of sediment size with Multidimensional Scaling (MDS) configurations of sediment metal concentrations. In addition, the proximity to shipping activity, and the release of anti-fouling paint from boats also influence heavy metal concentrations in marine sediments of Singapore.Publication Singapore(Elsevier, 2019) Chou Loke Ming; Huang Danwei; Tan Koh Siang; Toh Tai Chong; Goh P.L. Beverly; Tun, Karenne; Sheppard, Charles; TROPICAL MARINE SCIENCE INSTITUTE; BIOLOGICAL SCIENCES