Chemical insecticides have been considered as a means to combat crop pests. Although their effectiveness is evident, their impact on the environment is increasingly being discussed. The aim of this study is to determi...Chemical insecticides have been considered as a means to combat crop pests. Although their effectiveness is evident, their impact on the environment is increasingly being discussed. The aim of this study is to determine the agro-ecological potential of a biological insecticide (C<sub>25</sub>H<sub>32</sub>O<sub>12</sub>) based on Aloe barbadensis in a Sahelian context. For this purpose, a completely randomized block experimental design with 3 replications and 4 treatments was set up to experiment with Aloe barbadensis as a bioinsecticide against pests of Abelmoschus esculentus. However, data were collected using an observation and parameter monitoring grid. This includes the cultivation of Abelmoschus esculentus, soil preparation, seeding and watering, plot labeling, preparation of the bioinsecticide (selection and preparation of raw materials, grinding of Aloe barbadensis miller and extraction of the crude bioinsecticide, quantification of treatment doses and dilution, and obtaining the formulated bioinsecticide), plant watering, plant treatment, and finally parameter monitoring. The results obtained reveal that the level of damage is significantly high in the control treatment T0 (63%) compared to the other treatments, with 29% for treatment T1, 7% for T2, and 1% for T3, implying a strong action capability of this insecticide against pests of Abelmoschus esculentus. Therefore, it can be concluded that for a normal growing season of Abelmoschus esculentus, this biological insecticide should be sprayed 12 times. Furthermore, this biological insecticide is unique in that it does not inflict any gastric toxicity on the pests, which gives it the characteristic of being a repellent. It is a biological insecticide whose efficacy period has been tested, with a minimum duration of 21 days. In conclusion, this formulated bioinsecticide based on Aloe barbadensis demonstrates significant efficacy against pests of Abelmoschus esculentus. In the future, we will consider experimenting with its effectiveness against pests of o展开更多
芋螺毒素GeXIVAWT是来自食虫将军芋螺(Conus generalis Lonnaeus)毒管中,具有两对二硫键的28肽。通过化学合成这种芋螺毒素产量低、成本高、难以纯化。利用简单快速的重组表达来生产富含二硫键的芋螺毒素有可能成为有效的新途径。通过...芋螺毒素GeXIVAWT是来自食虫将军芋螺(Conus generalis Lonnaeus)毒管中,具有两对二硫键的28肽。通过化学合成这种芋螺毒素产量低、成本高、难以纯化。利用简单快速的重组表达来生产富含二硫键的芋螺毒素有可能成为有效的新途径。通过对芋螺毒素GeXIVAWT的基因进行密码子优化,人工合成引物来构建表达载体pET22b(+)/pelB-GeXIVAWT。融合了信号肽的重组芋螺毒素以包涵体的形式在大肠杆菌中获得了高效表达。利用低浓度尿素洗涤和超滤管进行纯化无组氨酸标签的重组芋螺毒素pelB-GeXIVAWT,再利用稀释复性的方法将无活性的包涵体转变成具有活性的重组芋螺毒素。复性后的重组蛋白采用反相高效液相色谱进一步纯化后进行了质谱鉴定。活性实验表明重组芋螺毒素pelB-GeXIVAWT具有抑制昆虫细胞Sf-9的生长,为研究芋螺毒素作为生物杀虫剂奠定基础。展开更多
文摘Chemical insecticides have been considered as a means to combat crop pests. Although their effectiveness is evident, their impact on the environment is increasingly being discussed. The aim of this study is to determine the agro-ecological potential of a biological insecticide (C<sub>25</sub>H<sub>32</sub>O<sub>12</sub>) based on Aloe barbadensis in a Sahelian context. For this purpose, a completely randomized block experimental design with 3 replications and 4 treatments was set up to experiment with Aloe barbadensis as a bioinsecticide against pests of Abelmoschus esculentus. However, data were collected using an observation and parameter monitoring grid. This includes the cultivation of Abelmoschus esculentus, soil preparation, seeding and watering, plot labeling, preparation of the bioinsecticide (selection and preparation of raw materials, grinding of Aloe barbadensis miller and extraction of the crude bioinsecticide, quantification of treatment doses and dilution, and obtaining the formulated bioinsecticide), plant watering, plant treatment, and finally parameter monitoring. The results obtained reveal that the level of damage is significantly high in the control treatment T0 (63%) compared to the other treatments, with 29% for treatment T1, 7% for T2, and 1% for T3, implying a strong action capability of this insecticide against pests of Abelmoschus esculentus. Therefore, it can be concluded that for a normal growing season of Abelmoschus esculentus, this biological insecticide should be sprayed 12 times. Furthermore, this biological insecticide is unique in that it does not inflict any gastric toxicity on the pests, which gives it the characteristic of being a repellent. It is a biological insecticide whose efficacy period has been tested, with a minimum duration of 21 days. In conclusion, this formulated bioinsecticide based on Aloe barbadensis demonstrates significant efficacy against pests of Abelmoschus esculentus. In the future, we will consider experimenting with its effectiveness against pests of o
文摘芋螺毒素GeXIVAWT是来自食虫将军芋螺(Conus generalis Lonnaeus)毒管中,具有两对二硫键的28肽。通过化学合成这种芋螺毒素产量低、成本高、难以纯化。利用简单快速的重组表达来生产富含二硫键的芋螺毒素有可能成为有效的新途径。通过对芋螺毒素GeXIVAWT的基因进行密码子优化,人工合成引物来构建表达载体pET22b(+)/pelB-GeXIVAWT。融合了信号肽的重组芋螺毒素以包涵体的形式在大肠杆菌中获得了高效表达。利用低浓度尿素洗涤和超滤管进行纯化无组氨酸标签的重组芋螺毒素pelB-GeXIVAWT,再利用稀释复性的方法将无活性的包涵体转变成具有活性的重组芋螺毒素。复性后的重组蛋白采用反相高效液相色谱进一步纯化后进行了质谱鉴定。活性实验表明重组芋螺毒素pelB-GeXIVAWT具有抑制昆虫细胞Sf-9的生长,为研究芋螺毒素作为生物杀虫剂奠定基础。
