Abdul Karim, Mohamed Ismail (1996) Effect of Dissolved Oxygen on the Growth, Sporulation and Larvicidal Activity of Bacillus sphaericus 2362. Pertanika Journal of Science & Technology, 4 (2). pp. 191-196. ISSN 0128-7680
Bacillus sphaericus produces bacterial protein toxin capable of killing larvae of mosquitoes which spread diseases such as filariasis, encephalitis and malaria. In batch culture, a maximum spore count of 2.9 x 109/ml media was obtained after 48 h cultivation. In continuous culture, a dilution rate of 0.10 hr- I was found to give a higher spore count than 0.15 h- 1 and 0.2 h- I dilution rates. Kinetic studies on dissolved oxygen (DO) levels showed that 20,50 and 100% gave rapid formation of free spores, whilst 5% DO gave poor results. Cells grown at 5, 20 and 50% DO levels gave comparable values of mosquito-larvicidal activity while those grown at 100% DO were significantly less toxic.
|Keyword:||B. sphaericus 2362, larvicidal activity, dissolved oxygen, growth, sporulation|
|Faculty or Institute:||Faculty of Food Science and Technology|
|Publisher:||Universiti Putra Malaysia Press|
|Deposited By:||Nur Izzati Mohd Zaki|
|Deposited On:||24 Nov 2009 07:25|
|Last Modified:||27 May 2013 07:06|
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