日科学家发现一种枯草杆菌可以防治葡萄病害

据新华社东京8月11日电,日本山梨大学葡萄酒科研中心日前发布消息称,该中心的研究人员把枯草杆菌KS1与能引起葡萄叶病害的两种真菌——灰霉菌和葡萄炭疽菌分别在琼脂培养基中一起培育,结果表明KSI可以抑制这两种病菌的生长。     

不同种类茶叶茶多酚对细菌生长的抑制作用

目的探讨不同种类茶叶中茶多酚对细菌生长的抑制作用。方法提取茶多酚,配成不同浓度的溶液;纸片法测定茶多酚(浓度为140mg/ml、120mg/ml、100 mg/ml、80 mg/ml、60 mg/ml、40mg/ml)对大肠杆菌、金黄色葡萄球菌及枯草杆菌的抑菌作用;比较抑菌效果。结果三种茶叶的茶多酚对供试细菌均有抑制作用,但不同茶叶的茶多酚对细菌的抑制作用不同,不同种类茶叶茶多酚对同一菌种的抑制作用亦不同。结论不同种类茶叶的茶多酚对细菌生长均有一定的作用。     

Adsorption of Cu^2 ＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis

A process of biosorption of Cu2 , Zn2 and Cd2 on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast. The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass. The results show that both the Ritchie second-order and modified second-order equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu2 and Zn2 on B. subtilis. The experimental data points of adsorption Cd2 and Zn2 on B. subtilis are described by Freundlich isotherms model.     

Optimization of Riboflavin Production from ccpA Mutant Bacillus subtilis 24A1/pMX45

Bacillus subtilisis widely used for the productionof vitamins and other products including industrial en-zymes such as amylases, proteases and lipase. Butsyntheses of those products are repressed by the pres-ence of glucose, which is viewed as carbon catabolicrepression (CCR). InBacillus subtilis,CCR is main-ly mediated by the global regulator protein CcpAwhich was encoded byccpAgene[1]. It is therefore of crucial importance to relievingCCR ofBacillus subtilisfor industrial production. I…     

芽孢染色实验中枯草杆菌最佳培养条件探索

芽孢染色所需菌种的菌龄极为关键,通过评估不同温度和时间处理下的芽孢成熟度,找到能够培养出最佳菌龄的枯草杆菌的培养条件。实验结果表明:在35℃培养42~48h或37℃培养36~42h的条件下,最适宜观察枯草杆菌的芽孢形成过程。该研究使学生更容易观察到芽孢形成各个阶段的形态特征,并为微生物实验教学的准备工作提供了参考数据。