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Publications (23)
Oceanic emission of gaseous elemental mercury (Hg⁰ or GEM) is an important source for atmospheric mercury (Hg), but existing estimates of global gross oceanic Hg⁰ emissions are highly variable (800–7,220 Mg yr⁻¹). This study measured atmospheric GEM concentrations and isotopic compositions at two coastal sites in Terengganu, Malaysia, a region that...
Conticribra weissflogii is a promising oleaginous microalga with a high fatty acid useful for aquaculture food and feed purposes. Low salinity has been found to promote fatty acid accumulation in microalgae. However, the effects of low salinities and the molecular mechanisms of fatty acid accumulation in C. weissflogii remain undetermined. Hence, t...
Fatty Acids (FAs) are the biochemical compounds used as chemotaxonomic biomarkers for the systematic grouping of cnidarians. This study presents the chemotaxonomy of hard coral, particularly from the family Acroporidae (Anacropora [ANA], Montipora [MON], Astreopora [AST], and Acropora [ACP]) by applying multivariate analysis of FA composition matri...
The spatial and temporal distribution of polycyclic aromatic hydrocarbons (PAHs) in three sediment cores from Brunei Bay, Southern South China Sea was investigated. The total concentrations of 16 priority PAHs (∑PAH16) and their alkyl-substituted derivatives ranged from 10.4 to 376 ng g⁻¹ and 30.7 to 2263 ng g⁻¹, respectively. PAH biomarker diagnos...
This study investigated the spatial variation of nitrogen (N)-based and phosphorus (P)-based nutrients together with water quality parameters (temperature, pH, dissolved oxygen, biological oxygen demand, chemical oxygen demand and total suspended solids) in the Dungun River basin, Terengganu. The Water Quality Index (WQI) of the river was applied a...
The surface distribution of lipid biomarkers, elemental and isotopic compositions (δ13C and δ15N, C/N) were investigated from coastal sediments of Brunei Bay, in order to understand the sources and biogeochemical processes of the organic matter. Fatty acid biomarkers from terrestrial higher plants (e.g., long-chain fatty acids>20), phytoplankton (e...
The purpose of this study was to characterize and determine the concentrations of polycyclic aromatic hydrocarbons (PAHs) emitted in smoke particulates from burning of Rhizophora apiculata, Melaleuca leucadendron and Hevea Brasilensis at the smouldering, flaming and charring stages. Smoke particulates were sampled using a total suspended particulat...
Seaweeds or macroalgae are the primary producers of an oceanic food source, widely distributed across the globe and known for their excellent defensive properties against numerous biotic and abiotic factors. These defensive traits come from their secondary metabolites that act as protective barriers against pathogens and harmful organisms where amo...
A baseline study to assess the distributions of aliphatic and polycyclic aromatic hydrocarbons in abiotic environment consisting of soil, sediment and atmospheric particulate samples was carried in Terengganu National Park. Aliphatic hydrocarbons were found in all three media studied whilst polycyclic aromatic hydrocarbon (PAH) compounds were detec...
The aim of this study was to determine the distribution of nitrogen (N)-and phosphorus (P)-based nutrients in the Besut River basin, Malaysia (South China Sea). The mean concentrations of ammonia, nitrate, total dissolved N and total particulate N were 43 µg/L N, 195 µg/L N, 485 µg/L N, 431 µg/L N, respectively. In contrast to N, lower mean concent...
In this study, characterization of fatty acids in Dictyota dichotoma and Sargassum granuliferum, the sea-weeds collected from Pulau Nuyunan, Sabah, were carried out. Fatty acid methyl-ester analysis (FAME) showed palmitic acid, elaidic acid, stearic acid, cis-11,14,17-eicosatrienoic acid and erucic acid were dominant in both seaweeds with co poly-...
A preliminary study of N compound levels in Tasik Kenyir, Terengganu, Malaysia was conducted from August to October 2010. In general, most of the monitoring stations had relatively higher concentrations of N compounds in the bottom water compared to the surface water. In comparison with other selected study areas in Malaysia, the concentration of N...
A study has been carried out to characterize hydrocarbons emitted from the burning of three tropical wood species. The woods were burned to ember and smoke aerosols emitted were sampled using high volume sampler fitted with a pre-cleaned glass fibre filters. Hydrocarbons were extracted using ultrasonic agitation with dichloromethane-methanol (3:1 v...
Hydrocarbon compounds viz. aliphatic hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), sterols, long chain fatty acids, alkanones and alkanals in surface sediment of Setiu Wetland were analysed and characterized using GCMS. The concentration of total identified resolved n-alkanes (TIRNA) in sediment ranged from 2.99–11.6 μ g g dry weight. The...
A study has been carried out to characterize hydrocarbons emitted from the burning of two typical garden wastes, bachang (Mangifera foetida) litter falls and grass (panicum repens). The biomass samples were burned and their respective smoke particulate emitted was sampled using high volume sampler fitted with pre-cleaned glass fibre filters under s...
A study has been carried out to determine the affect of grassland fire on the distribution of polycyclic aromatic hydrocarbons (PAHs) in roadside soils of Marang district. 15 surfacial soil samples were collected from Kuala Tengah in Pulau Kerengga to Kg. Baharu in Merchang, a stretch of area bordering to the national trunk road, which frequently s...
A study has been carried out to characterize polycyclic aromatic hydrocarbons emitted from the burning of five types of typical garden wastes viz, Bachang, Mango, Jackfruit, Jambu Air litter fall and a type of Grass. The samples were burned to the ember and respective smoke aerosols emitted during the burning period were sampled using high volume f...
A study has been carried out to characterize hydrocarbons emitted from the burning of selected tall grass and litter fall samples. The biomass samples were burned under smouldering and flaming conditions and their respective smoke particulate emitted was sampled by high volume filtration on a pre- cleaned (solvent extracted) glass fibre filters. Hy...
A study has been carried out to characterize hydrocarbons emitted from the burning of two wood samples that is kulim (Scorodocarpus spp.) and seraya (Shorea spp.). The woods were burned and respective smoke aerosols emitted were sampled using high volume filtration on a pre-cleaned glass fibre filters under smouldering and flaming conditions. Hydro...
