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Articles by S.M. Al-Barwani
Total Records ( 7 ) for S.M. Al-Barwani
  S.M. Al-Barwani , A. Arshad , S.M.N. Amin and J.S. Bujang
  Incidences of hermaphroditism in green mussels (Perna viridis) were determined in four different areas (Sebatu, Port Dickson, Muar and Johor Bahru) along the west coast of Peninsular Malaysia. In Sebatu, 1000 specimens of green mussels were used for the visual determination of sex ratios. The male:female visual ratio was 1:0.79. Three hundred and seventeen individuals were also sexually identified using histology technique. Male to female ratio was 1:1.01. Two hermaphrodite specimens were recorded during the months of June and September, 2004. In Port Dickson, 319 specimens were visually sex-determined, the male: female ratio was 1.00:0.86. One hundred forty one were also histologically identified. Male: female ratio was 1.00:0.96. There was no hermaphrodite specimen encountered in this population. For the population of Muar and Johor Bahru, the entire specimen’s numbers were visually sex-determined first and later confirmed by histological procedure. The male:female ratio was 0.72:1.00 and 1.00:0.95. No hermaphrodite specimen was found at either site. The pooled samples from different months showed no significant seasonal deviation in the sex ratio from a 1:1 ratio (Chi-square test, p>0.05).
  S.M. Al-Barwani , D. Aziz , S.M.N. Amin and A. Arshad
  Thirteen highly polymorphic microsatellite primer pairs developed for Perna viridis from the gene bank were tested on 3 populations of Perna perna samples with the aim to adapt a fast, reliable method for preliminary screening and to genetically characterize the wild populations of P. perna in the Oman waters. The samples were collected from three different locations viz Ras Al-Had, Ras Madrakah and Mirbat. All primers showed high level of polymorphism for all populations. The mean observed heterozygosity was lower than the expected heterozygosity across the three populations which means there was a probability of inbreeding occurred in the populations. Both the chi-square (χ2) and likelihood (G2) ratio tests detected significant differences (p<0.05), which showed deviations from Hardy-Weinberg equilibrium. Cluster analysis revealed a close genetic relationship of P. perna between all populations and they were clustered according to their geographical origins into two major groups which include one cluster that grouped the Mirbat and the Ras Madrakah populations together while the other cluster showed the Ras Al Had domain. The highest genetic distance (1.2666) was observed between the Mirbat and the Ras Al Had populations while the lowest genetic distance (0.4746) was recorded between the Mirbat and Ras Madrakah populations. This study demonstrated that microsatellite markers with thirteen P. viridis primer pairs tested can be applied to genetically characterize the brown mussel populations in Oman waters.
  B.Y. Kamaruzzaman , M.S. Mohd Zahir , B. Akbar John , K.C.A. Jalal , S. Shahbudin , S.M. Al-Barwani and J.S. Goddard
  A study was conducted to determine the bioaccumulation of some essential and non-essential heavy metals by the soft tissue of Perna viridis (Green mussel) collected from Pekan, Pahang during November 2009. A total of fifty individuals of Green lipped mussel P. viridis (Family: Mytilidae) were sampled and metals such as Iron (Fe), Zinc (Zn), Copper (Cu), Cobalt (Co), Lead (Pb) and Cadmium (Cd) concentration were determined using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The observed mean concentration of Fe, Zn, Cu, Co, Pb and Cd in the soft edible tissue of P. viridis was 576.45±87.78, 45.54±8.75, 19.05±4.12, 17.85±2.28, 0.47±0.14 and 0.3±0.06 μg g-1, respectively. The bioaccumulation of metals in the soft tissue flowed in Fe>Zn>Cu >Co>Pb>Cd order indicating that the essential heavy metal accumulates in faster rate than non-essential metals. Comparison with earlier studies showed that Fe and Cu bioaccumulation level was higher in samples from Pekan area with average of 576.45 and 19.05 μg g-1, respectively. All the other metals concentration was lower in the soft tissue of green mussel indicating comparatively lower heavy metal contamination in the Pekan, Pahang compared with other coasts.
  B.Y. Kamaruzzaman , A. Siti Waznah , M.S. Mohd Zahir , M.C. Ong , S. Shahbudin , K.C.A. Jalal , Z. Rina Sharlinda , A.T. Shuhada , B. Akbar John , B. Joseph , S.M. Al-Barwani and J.S. Goddard
  Bottom sediments from 62 stations at Pahang river-estuary were analyzed for the concentrations of Chromium (Cr), Manganese (Mn) and Cobalt (Co). Heavy metal concentrations were analyzed by using an Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The average dry weight concentrations of Cr, Mn and Co were 62.80±20.04, 416.21±127.41 and 7.93±3.25 μg g-1, respectively. The observed concentrations of the studied metals were significantly higher near the estuary and declining as the sampling points were further away from the estuary. The Enrichment Factors (EFs) were calculated and all elements showed metal contamination was predominantly of terrigenous in origin.
  M.Z. Hazmadi , S.M.N. Amin , A. Arshad , M. Aminur Rahman and S.M. Al-Barwani
  Study on length-weight relationships of anchovy, Stolephorus tri collected from Benting Lintang (Lat. 5°44'33.62 N and Long. 102°39'22.84 E), the coastal waters of Besut, Terengganu was carried out on June and July 2010. Stolephorus tri are important component of marine ecosystems and commercially significant marine food resources in Malaysia. The mean size length of Stolephorus tri was 63.53 mm with a range of 51.0-76.0 mm. The average weight of Stolephorus tri was 1.57 g. The relationship between total length and body weight of Stolephorus tri was Log W = 3.0384 Log TL-5.2923 (W = 0.00001 TL3.0384). It is revealed that the exponent ‘b’ for Stolephorus tri was very close to the isometric value (b = 3). Therefore, the relative growth of Stolephorus tri was isometric in the coastal waters of Besut, Terengganu.
  B.Y. Kamaruzzaman , M.S. Zahir , B. Akbar John , A. Siti Waznah , K.C.A. Jalal , S. Shahbudin , S.M. Al-Barwani and J.S. Goddard
  An effort to analyze selected heavy metal accumulation by the razor clam (Solen brevis) from Tanjung Lumpur was conducted on January to April 2010. A total of fifty individuals of Razor clam Solen brevis were sampled and metals such as Iron (Fe), Zinc (Zn), Copper (Cu), Manganase (Mn), Lead (Pb) and Cadmium (Cd) Concentrations were determined using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Among the metals Fe occurred in elevated concentration in the soft tissue of razor clam followed by Zn. Cd was found to be in least concentration in the sample. Mean concentration of Fe, Zn, Mn, Cu, Cd and Pb in the soft tissue were 415.2±56.52, 87.74±11.85, 18.71±2.10, 8.64±1.75, 0.67±0.29 and 1.61±0.45 μg g-1 dw, respectively indicating that the bioaccumulation of essential metals in the soft tissue was greater than the non essential heavy metals. Metal accumulation in the soft tissue of razor clam followed Fe > Zn > Mn > Cu > Pb > Cd order in present study. The observed concentration of acute toxicity of metals in Solen brevis (Family: Solenidae) from Tanjung Lumpur Coastal waters was lower than the permissible limit recommended by National and international standards proved that this species could be utilized for human consumption.
  B.Y. Kamaruzzaman , N.T. Shuhada , B. Akbar , S. Shahbudin , K.C.A. Jalal , M.C. Ong , S.M. Al-Barwani and J.S. Goddard
  Surface sediment samples were collected from 5 different zones of the Langkawi coastal waters, Malaysia to determine the concentration of Lead (Pb) and Copper (Cu) by using the sensitive Inductively Coupled Plasma Mass Spectrometer (ICP-MS). The concentration of heavy metals was compared with the world average concentration of shale values. It was found that the total concentration of Pb was between 12.25 and 71.38 μg g-1 dw with mean concentration value of 41.87±7.30 μg g-1 dw which was two fold higher than the average shale value (20 μg g-1). Statistical analysis showed that the significant variation in Pb concentration between different sampling stations (p<0.05). Copper (Cu) concentration was ranged between 0.40 and 30.95 μg g-1 dw with mean concentration of 11.19±5.2 μg g-1 dw which was lower than the average shale value (45 μg g-1 dw). Enrichment Factor (EF) showed that source of Pb concentration in the study area was partially due to anthropogenic activities and the source of Cu was dominantly from terrigenous in origin. Results of the analysis showed that a coastal area of Langkawi is facing moderate metal pollution with increased rate of deposition.
 
 
 
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