484-485 / 1195
a
% injury calculated as
100 )
1(
x
n
n
nonselect
select
−
where
n
select
= mean number of colonies on selective agar and
n
nonselect
= mean number of colonies on nonselective agar
1
b
MPN = Most Probable Number is based on a 3-tube, 4-dilution protocol (100g, 10g, 1g, 0.1g)
2
c
X
2
is defined by Mantel-Haenszel as (n-1)(AF-(B+C+D)E)
2
/(A+B+C+D)(A+E)B+C+D+F)(E+F) where n+A+B+C+D+E+F. A X
2
value greater than 3.84 indicates significance at
p
>0.05.
3
4
25