The draft genome of Bacillus velezensis strain B6, a rhizobacterium with good biocontrol performance isolated from soil in China, was sequenced. The assembly comprises 32 scaffolds with a total size of 3.88 Mb. Gene clusters coding either ribosomally encoded bacteriocins or nonribosomally encoded antimicrobial polyketides and lipopeptides in the genome may contribute to plant disease control.

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Abstract.A widely used teaching quality evaluation method is based on comparison of the mean values of the student's exam results. However, if the students with great diversity are not grouped randomly, this method may lead to unfair and incorrect results. As an example, this paper studied data from a primary school to discuss the issue and a set of new teaching quality evaluation methods based on statistical analysis was presented. And conclusions have been made that most of the mean values of exam results among different classes inside the school have no significant statistic difference, and even if some difference exits, the main contribution to that difference is mainly from the non-random distribution of students rather than the difference of teaching quality among teachers. The analysis method used in this paper can be applied in all similar teaching evaluation cases. 数理统计分析在教学质量评估中的应用实例