Scale used to evaluate interference competition
JASON K. DOBRANIC
c0hx at UNBSJ.CA
Tue Mar 22 19:54:49 EST 1994
I was wondering if any of you working on interference competition
bioassays have a good scale for evaluating reaction types. I am so far
aware of the following one using the index of antagonism:
Points Reaction type
A Mutual intermingling of the two organisms
B Mutual inhibition on contact; the space between the colonies
1 is small but clearly marked
C Mutual inhibition at a distance
D Inhibition of one organism on contact; the antagonist
3 continues to grow, unchanged or at a reduced rate, through
the colony of the inhibited organism.
E Inhibition of one organism at a distance; the antagonist
4 continues to grow through the resulting clear zone at an
unchanged or reduced rate.
Index of Antagonism:
IA = [n(A*0) + n(B*1) + n(C*2) + n(D*3) + n(E*4)] / the number of trials
where n is the frequency of the reaction type.
(After Wicklow et al, 1980; Strongman, 1986)
Is there in your opinion a better way of evaluating this? Also for slow
growing antagonists it seems difficult to choose between C and E.
Thanks for any help!
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