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International Journal of Mosquito Research
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International Journal of Mosquito Research
Vol. 3, Issue 4, Part A (2016)

Novel techniques for cost-effective production of Bacillus thuringiensis Subsp. israelensis

Larvicidal activity of <em>Bacillus thuringiensis </em>subsp. <em>israelensis</em> for different carbon sources in batch fermentations. The figure also shows the different concentrations for each carbon source, at which the ‘crabtree effect’ is observed. Larvicidal effect is maximum at different concentrations for each of the sources used.
Fig. 1: Larvicidal activity of Bacillus thuringiensis subsp. israelensis for different carbon sources in batch fermentations. The figure also shows the different concentrations for each carbon source, at which the ‘crabtree effect’ is observed. Larvicidal effect is maximum at different concentrations for each of the sources used.
Bioassay results of batch fermentation studies using different carbon sources (a) Glucose
Fig. 2: Bioassay results of batch fermentation studies using different carbon sources (a) Glucose
Bioassay results of batch fermentation studies using different carbon sources (b) Sucrose
Fig. 3: Bioassay results of batch fermentation studies using different carbon sources (b) Sucrose
Bioassay results of batch fermentation studies using different carbon sources (c) tapioca powder
Fig. 4: Bioassay results of batch fermentation studies using different carbon sources (c) tapioca powder
Bioassay results of batch fermentation studies using different carbon sources (d) Jaggery
Fig. 5: Bioassay results of batch fermentation studies using different carbon sources (d) Jaggery
Bioassay results of batch fermentation studies using different carbon sources (e) Cane sugar juice
Fig. 6: Bioassay results of batch fermentation studies using different carbon sources (e) Cane sugar juice
Larvicidal activity of <em>Bacillus thuringiensis</em> subsp. <em>Israelensis</em> for different carbon sources in fed-batch fermentation.
Fig. 7: Larvicidal activity of Bacillus thuringiensis subsp. Israelensis for different carbon sources in fed-batch fermentation.
Bioassay results of fed-batch fermentation studies (a) Glucose
Fig. 8: Bioassay results of fed-batch fermentation studies (a) Glucose
Bioassay results of fed-batch fermentation studies (b) Sucrose
Fig. 9: Bioassay results of fed-batch fermentation studies (b) Sucrose
Bioassay results of fed-batch fermentation studies (c) Jaggery
Fig. 10: Bioassay results of fed-batch fermentation studies (c) Jaggery
Bioassay results of fed-batch fermentation studies (d) Cane sugar juice
Fig. 11: Bioassay results of fed-batch fermentation studies (d) Cane sugar juice
Bioassay results of fed-batch fermentations of Bti with different concentrations of glucose and 1% soyabean
Fig. 12: Bioassay results of fed-batch fermentations of Bti with different concentrations of glucose and 1% soyabean
Bioassay results of batch fermentations of Bti with different carbon sources (3% Jaggery and 3% cane sugar juice) without yeast extract
Fig. 13: Bioassay results of batch fermentations of Bti with different carbon sources (3% Jaggery and 3% cane sugar juice) without yeast extract
Bioassay results of aeration studies of Bti with different carbon sources (3% Jaggery and 3% cane sugar juice) without yeast extract
Fig. 14: Bioassay results of aeration studies of Bti with different carbon sources (3% Jaggery and 3% cane sugar juice) without yeast extract
Comparison of larvicidal activity between biomass obtained through batch (left) and fed-batch (right) fermentations of <em>Bacillus thuringiensis </em>subsp. <em>Israelensis </em>using increased aeration (high Kla value), and that obtained through normal aeration.
Fig. 15: Comparison of larvicidal activity between biomass obtained through batch (left) and fed-batch (right) fermentations of Bacillus thuringiensis subsp. Israelensis using increased aeration (high Kla value), and that obtained through normal aeration.
Bioassay result of media containing 0.1% Calcium chloride
Fig. 16: Bioassay result of media containing 0.1% Calcium chloride
Bioassay results of batch fermentations of Bti for observing effect of 0.1% Calcium carbonate with two different nitrogen sources as additive on sporulation
Fig. 17: Bioassay results of batch fermentations of Bti for observing effect of 0.1% Calcium carbonate with two different nitrogen sources as additive on sporulation
Comparison of larvicidal activity between biomass obtained in batch fermentations without and with calcium carbonate.
Fig. 18: Comparison of larvicidal activity between biomass obtained in batch fermentations without and with calcium carbonate.
International Journal of Mosquito Research