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Articles by Asmida Ismail
Total Records ( 2 ) for Asmida Ismail
  Asmida Ismail , Nordiana Bakti Mohd Yusoff , Sarah Diyana Mohd Sakia , Ihsan Alwia , Mohd Nizam Mohd Saidb , Mohd Talib Latif , Ahmad Ismail , Faezah Buyong , Siti Aisyah Razli and Amyrul Rafiq Zulkifli
  Some microalgal species are known to be able to tolerate the presence of atmospheric pollutants. However, this is at the expense of other species. Some species are pollutant tolerant while others are pollutant intolerant. Thus, this study is conducted to understand the relationship between Carbon monoxide (CO) and epiphytic terrestrial algae. The samples of algae was collected from four sites namely Rawang and Pelabuhan Kelang to represent the urban area while Kuala Selangor and Port Dickson represent the rural area. All sites sustained approximately > 10 species of algae. For data feasibility, only algae with density of more than 30×104 cells per cm2 are being counted. Results showed that the urban area recorded slightly higher species richness (4 species) compared to the rural area (3 species). The urban sites which recorded higher concentration of carbon monoxide (11 μ gm–3) compared to the rural sites (2 μ gm–3), support the growth of Desmococcus olivaceus up to 6-fold with algal density of 12390×104 cells/cm2. In the rural area, Desmococcus olivaceus also dominating the area with much lower density at 2985×104cell/cm2. Another algal species that inhabit the urban site is Trebouxia arboricola which also recorded high density at 12120×104cells per cm2. Jaccard Similarity Index showed only 40% similarity between sites of low and high CO concentration. The cosmopolitan species in this study is Trentepohlia umbrina. However, the density of this species belongs to the lower range compared to other species at only 30×104 cell/cm2. The results also showed that the concentration of carbon monoxide and algal density are positively correlated. Carbon monoxide showed a strong positive correlation (R = 0.901). This research concludes that the urban area which contained higher CO ultimately increase the density of algae compared to the rural area.
  Asmida Ismail , Nurul Farhana Arbain , Noor Akmal Wahab , Ahmad Ismail and Siti Khairiyah Mohd Hatta
  Terrestrial algae, one of the many important living things for the earth’s ecosystem are abundant in large spectrum such as on tree barks, stones, walls and plastics. The objectives of this research were to assess the effect of shading towards the number of algal cells inhabiting 30 free standing trees. Besides that this study also looks into the number of algal cells in polluted and unpolluted environment. The results of this study showed that epiphytic terrestrial algae were found to grow abundantly in polluted environment as opposed to unpolluted ones. The algae are believed to be able to tolerate high amount of air pollutants such as carbon dioxide, carbon monoxide and many nitrogenous gases. Shading also appeared to influence the number of algal cells where the area with less shade provide better living ground for the algae. The number of algae is directly proportional to the amount of light they received. Therefore, this study provides a useful baseline data on some pollutant-tolerant algal species.
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