Flocculation of Bacillus thuringiensis var. israelensis suspension and its efficacy against mosquito larvae

被引:4
|
作者
Szepesszentgyörgyi, A
Bárány, S
Mécs, I
机构
[1] Bay Zoltan Fdn Appl Res, Ctr Biotechnol, H-6726 Szeged, Hungary
[2] Univ Misckolc, H-3515 Miskolc Egyetenv, Hungary
来源
ACTA BIOLOGICA HUNGARICA | 2005年 / 56卷 / 1-2期
关键词
flocculation; cellular suspension; polyelectrolytes; sedimentation; toxicity;
D O I
10.1556/ABiol.56.2005.1-2.15
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Bacillus thuringiensis ssp. israelensis (Bti) is increasingly used as an ecologically friendly anti-mosquito agent. The bacterium cells undergo fermentation in dilute suspensions; before practical use, therefore it is necessary to concentrate the suspensions. Aggregation by polymers is a powerful tool with which to regulate the stability of suspensions. Typically, polymers at low concentrations destabilize and at high concentrations stabilize colloidal systems. Bti suspensions can be flocculated efficiently by either cationic or anionic polyelectrolytes. Cationic polyelectolytes were found to be the most efficient flocculants for bacterial suspensions. It was shown that the degree of toxicity of the flocculated Bti suspensions for biting mosquito larvae was in the same range than in non-flocculated suspension.
引用
收藏
页码:151 / 164
页数:14
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