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×î½üÔÚ¿´¹ØÓڿݲݵÄÊ飬ÓÐÒ»¶Î»°Õª³×ÔÓªÑøÅàÑø»ùÒ»½Ú¡£²»ÊǺÜÀí½â¡£Âé·³ÄÄλ´óÏÀµã²¦Ò»Ï£¡Ð»Ð»£¡ Because of their rather granular consistency, colonies of B. subtilis grown on simple nutrient agar plates can be difficult to use consistently for inoculating other cultures. This is particularly noticeable when inoculating liquid cultures, since clumps of cells often remain intact, increasing in size as the culture grows and producing very heterogeneous cultures. These problems may be overcome to some extent by the use of a straight wire rather than a loop for inoculation. The sides of the tube or flask just above the surface of the m¨¦dium should be wetted with a little m¨¦dium and the inoculating cell mass mac¨¦rated to a smooth paste with the wire. Difficul- ties can also be experienced when testing the phenotype of colonies by spot inoculating from nutrient agar plates, since the tendency to clump leads to biomass growth at the site of inoculation. Clones can be falsely scored as positive even w h e n antibiotic selection is used. |
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