| 固定化苏云金杆菌以色列变种控制水中红虫的研究 |
| 摘要点击 2163 全文点击 2129 投稿时间：2003-10-20 修订日期：2003-12-16 |
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| 中文关键词 固定化苏云金杆菌以色列变种 水处理 红虫 |
| 英文关键词 immobilization of Bacillus thuringiensis var. israelensis de Barjac water treatment chironomid |
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| 中文摘要 |
| 采用聚乙烯醇(PVA)加少量海藻酸钠及活性炭的方法固定一株对红虫具有高效毒力的苏云金杆菌以色列变种(B.t.i).结果表明,控制质量分数分别为10%PVA、1%海藻酸钠和20%活性炭,采用4%CaCl2的饱和硼酸溶液(pH为6.7)作为交联剂且交联时间为24h时,制得的凝胶颗粒机械强度好,操作简单,制作成本低.B.t.i固定化微球缓慢释放,且对红虫具有很高的毒力作用. |
| 英文摘要 |
| A strain from Bacillus thuringiensis var. israelensis de Barjac (B.t.i), having a fatal toxicity to chironomids, was immobilized in the PVA-H3BO3 gel beads confected with a bit of sodium alginate and activated carbon. The result showed that optimal weight ratios were 10%PVA, 1% sodium alginate and 20% activated carbon, respectively. When 4% calcium chloride saturated boric acid solution (pH=6.7) was used as gelatin agent for gelating 24h, the produced gel beads had good performance in mechanical strength. This method is proved to be simple and cheap. The toxicity of the beads to chironomids is high and the release is slow. |
