Bacillus thuringiensis （Bt） is widely used in insecticides. Bt is a gram positive sporulation bacterium belonging to Bacillaceae family. It produces different insecticidal proteins like Cry toxin, Vip toxin, β-exot...Bacillus thuringiensis （Bt） is widely used in insecticides. Bt is a gram positive sporulation bacterium belonging to Bacillaceae family. It produces different insecticidal proteins like Cry toxin, Vip toxin, β-exotoxin and chitinase, etc. Bt insecticidal crystal proteins （ICPs） are not homologous to other known Vip protein and then act against lepidopteran, dipteran, coleopteran and nematodeslarvae via a unique process. In this experiment, modern high-throughput sequencing technique and sequencing were used and the whole genome sequence of BtLTS290 was obtained. The results compared to the database of GenBank showed that there was a cry57 gene in the genome sequence of BtLTS290. A novel cry57 gene was cloned and named cry57Ab1 （accession number is KF638650） by International Nomenclature Committee of Bt Endotoxin. cry57Ab1 gene could be expressed with the molecular weight of 90 ku. Cry57Ab1 protein had no obvious activity against Spodoptera exigua and Helicoverpa armigera. And Cry57Ab1 protein had a slight insecticidal activity against Ostrinia furnacalis and Plutella xylostella. Furthermore, the domain Ⅱof Cry57Ab1 and Cry1Bb were exchanged by overlapping extension PCR. SDS-PAGE showed that the molecular weight of Cry57Ab/1Bb/57Ab was about 90 ku. The insecticidal activity of Cry57Ab1 protein and Cry57Ab/1Bb/57Ab recombinant protein were determined. The results showed that the insecticidal activity of the recombinant protein to Spodoptera exigua and Helicoverpa armigera was very low, and the corrected mortality was less than 10%. The insecticidal activities against Ostrinia furnacalis and Plutella xylostella were reduced. The corrected mortality of Ostrinia furnacalis was 4.4%, and the corrected mortality rate for Plutella xylostella was 6.7%. Domain Ⅱof cry toxin played a key role on affecting host specifcity.展开更多
目的系统评价双歧杆菌三联活菌散/胶囊对儿童功能性消化不良(FD)的治疗作用。方法检索中国知网、万方、维普、PubMed、Embase、Web of Science数据库中关于双歧杆菌三联活菌散/胶囊治疗儿童FD的随机对照试验或前瞻性非随机对照试验,检...目的系统评价双歧杆菌三联活菌散/胶囊对儿童功能性消化不良(FD)的治疗作用。方法检索中国知网、万方、维普、PubMed、Embase、Web of Science数据库中关于双歧杆菌三联活菌散/胶囊治疗儿童FD的随机对照试验或前瞻性非随机对照试验,检索时间为建库至2022年6月。由两个评价者依据纳入和排除标准分别单独筛选并获得文献和临床资料,采用RevMan 5.3软件进行Meta分析。结果纳入9篇文献,共944例患者。Meta分析结果显示,双歧杆菌三联活菌散/胶囊(试验组)治疗儿童功能性消化不良的总有效率显著高于常规治疗(对照组)[OR=4.89,95%CI(3.15~7.59),P<0.00001]。试验组患儿治疗后的症状评分、腹痛、腹胀、恶心的消退时间均明显低于对照组(P<0.05),而血清胃动素水平显著高于对照组(P<0.05)。结论双歧杆菌三联活菌散/胶囊治疗儿童功能性消化不良效果显著。展开更多
基金Supported by the National Key R&D Projects(2017YFD0201200)Heilongjiang Provincial National Science Foundation(C2016025)
文摘Bacillus thuringiensis （Bt） is widely used in insecticides. Bt is a gram positive sporulation bacterium belonging to Bacillaceae family. It produces different insecticidal proteins like Cry toxin, Vip toxin, β-exotoxin and chitinase, etc. Bt insecticidal crystal proteins （ICPs） are not homologous to other known Vip protein and then act against lepidopteran, dipteran, coleopteran and nematodeslarvae via a unique process. In this experiment, modern high-throughput sequencing technique and sequencing were used and the whole genome sequence of BtLTS290 was obtained. The results compared to the database of GenBank showed that there was a cry57 gene in the genome sequence of BtLTS290. A novel cry57 gene was cloned and named cry57Ab1 （accession number is KF638650） by International Nomenclature Committee of Bt Endotoxin. cry57Ab1 gene could be expressed with the molecular weight of 90 ku. Cry57Ab1 protein had no obvious activity against Spodoptera exigua and Helicoverpa armigera. And Cry57Ab1 protein had a slight insecticidal activity against Ostrinia furnacalis and Plutella xylostella. Furthermore, the domain Ⅱof Cry57Ab1 and Cry1Bb were exchanged by overlapping extension PCR. SDS-PAGE showed that the molecular weight of Cry57Ab/1Bb/57Ab was about 90 ku. The insecticidal activity of Cry57Ab1 protein and Cry57Ab/1Bb/57Ab recombinant protein were determined. The results showed that the insecticidal activity of the recombinant protein to Spodoptera exigua and Helicoverpa armigera was very low, and the corrected mortality was less than 10%. The insecticidal activities against Ostrinia furnacalis and Plutella xylostella were reduced. The corrected mortality of Ostrinia furnacalis was 4.4%, and the corrected mortality rate for Plutella xylostella was 6.7%. Domain Ⅱof cry toxin played a key role on affecting host specifcity.
文摘目的系统评价双歧杆菌三联活菌散/胶囊对儿童功能性消化不良(FD)的治疗作用。方法检索中国知网、万方、维普、PubMed、Embase、Web of Science数据库中关于双歧杆菌三联活菌散/胶囊治疗儿童FD的随机对照试验或前瞻性非随机对照试验,检索时间为建库至2022年6月。由两个评价者依据纳入和排除标准分别单独筛选并获得文献和临床资料,采用RevMan 5.3软件进行Meta分析。结果纳入9篇文献,共944例患者。Meta分析结果显示,双歧杆菌三联活菌散/胶囊(试验组)治疗儿童功能性消化不良的总有效率显著高于常规治疗(对照组)[OR=4.89,95%CI(3.15~7.59),P<0.00001]。试验组患儿治疗后的症状评分、腹痛、腹胀、恶心的消退时间均明显低于对照组(P<0.05),而血清胃动素水平显著高于对照组(P<0.05)。结论双歧杆菌三联活菌散/胶囊治疗儿童功能性消化不良效果显著。
