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Articles by Sumaiya Ahmed
Total Records ( 2 ) for Sumaiya Ahmed
  Md. Sagir Ahmed , Md. Raknuzzaman , Hafeza Akther and Sumaiya Ahmed
  A study was conducted on association of Vibrio cholerae with plankton specially emphasis on cyanobacteria in relation to some physico-chemical parameters in the River Buriganga, Dhaka, from January to December 2002. Monthly abundance of phytoplankton and zooplankton varied from 457 to 14166 and from 169 to 1055 individual L-1, respectively. Monthly average of faecal coliform in water, zooplankton and phytoplankton samples were 3.99x109, 4.54x103 and 4.28x102 (CFU L-1), respectively. During epidemics, toxigenic V. cholerae 01 and 0139 were isolated from the patients as well as from the surface water. V. cholerae 01 and 0139 were also isolated from plankton samples. More over, it was observed that ctx (cholera toxic) positive in water and phytoplankton samples of the river. A bloom of Oscillatoria sp. (1.6x104 individual L-1) occurred in the upper reaches of the River Buriganga in May 2002. Methanol-water extract of bloom sample was analyzed by high performance liquid chromatography with UV detection and Mass Spectrum (MS) detected microcystin-RR. Cyanobacteria are abundant in the aquatic environment of Bangladesh and it was established that V. cholerae maintain a symbiotic relationship with these algae particularly mucilaginous cyanobacteria. During epidemics, patients symptoms included diarrhea, vomiting and hemorrhagic enteritis and in severe cases hemorrhagic diarrhea. So, question has arisen that which is responsible, microcystins or cholera for death of cholera/diarrhea patients in Bangladesh. Future research should be directed to isolate microcystins and cholera toxins from the epidemic areas to clarify the fact.
  Md. Sagir Ahmed , Md. Raknuzzaman and Sumaiya Ahmed
  Potentially toxic cyanobacterial blooms are becoming common in the freshwater reservoirs in all regions of Bangladesh. The River Buriganga is a eutrophic urban river in the country and its water is utilized as drinking water supply and other recreational purposes. A bloom of Oscillatoria sp. occurred in the river Buriganga during May 2002. Bloom sample was collected and filtered through a glass fiber filter. Methanol-water extract of filtered cells were analyzed by High Performance Liquid Chromatography (HPLC) with UV, detection and Mass Spectrum (MS) detected Microcystin-RR. The concentration of microcystin RR was 0.235 μg L-1. As this river water is supplied to city dweller for drinking and other domestic usage there should have a regular monitoring system for cyanobateria blooms and microcystins to ensure the public health safety. To avoid the microcystins health risk to humans through drinking water, it is advised not to use this river water for drinking or any other domestic purposes until the provisional safety levels of microcystins are reported through the concerned authority.
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