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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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xissy

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