Effect of Dissolved Oxygen on the Growth, Sporulation and Larvicidal Activity of Bacillus sphaericus 2362
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...
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| Format: | Article |
| Language: | English English |
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Universiti Putra Malaysia Press
1996
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3217/ http://psasir.upm.edu.my/id/eprint/3217/1/Effect_of_Dissolved_Oxygen_on_the_Growth%2C_Sporulation.pdf |
| _version_ | 1848839468179521536 |
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| author | Abdul Karim, Mohamed Ismail |
| author_facet | Abdul Karim, Mohamed Ismail |
| author_sort | Abdul Karim, Mohamed Ismail |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T07:11:55Z |
| format | Article |
| id | upm-3217 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:11:55Z |
| publishDate | 1996 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-32172013-05-27T07:06:31Z http://psasir.upm.edu.my/id/eprint/3217/ Effect of Dissolved Oxygen on the Growth, Sporulation and Larvicidal Activity of Bacillus sphaericus 2362 Abdul Karim, Mohamed Ismail 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. Universiti Putra Malaysia Press 1996 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3217/1/Effect_of_Dissolved_Oxygen_on_the_Growth%2C_Sporulation.pdf 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 English |
| spellingShingle | Abdul Karim, Mohamed Ismail Effect of Dissolved Oxygen on the Growth, Sporulation and Larvicidal Activity of Bacillus sphaericus 2362 |
| title | Effect of Dissolved Oxygen on the Growth, Sporulation
and Larvicidal Activity of Bacillus sphaericus 2362 |
| title_full | Effect of Dissolved Oxygen on the Growth, Sporulation
and Larvicidal Activity of Bacillus sphaericus 2362 |
| title_fullStr | Effect of Dissolved Oxygen on the Growth, Sporulation
and Larvicidal Activity of Bacillus sphaericus 2362 |
| title_full_unstemmed | Effect of Dissolved Oxygen on the Growth, Sporulation
and Larvicidal Activity of Bacillus sphaericus 2362 |
| title_short | Effect of Dissolved Oxygen on the Growth, Sporulation
and Larvicidal Activity of Bacillus sphaericus 2362 |
| title_sort | effect of dissolved oxygen on the growth, sporulation
and larvicidal activity of bacillus sphaericus 2362 |
| url | http://psasir.upm.edu.my/id/eprint/3217/ http://psasir.upm.edu.my/id/eprint/3217/1/Effect_of_Dissolved_Oxygen_on_the_Growth%2C_Sporulation.pdf |