NO3/NO2 OXIDISING/REDUCING BACTERIA
K N and P J Harris
ecoli at cix.compulink.co.uk
Wed Aug 23 03:09:46 EST 1995
For these awkward little beggars Peter Herman is quite right.
BUT, before you launch out onto a survey take a look at the confidence
intervals for MPN methods. They give a number, OK, but the +/- intervals
are horrific unless you want to do huge numbers of replicates per
dilution. There are computer programmes which allow you to get MPNs from
virtually any combination of dilutions and replicates.
To get really good numbers it is worth thinking about multiwell plates
and some degree of automation. We had to get into this for soil
protozoan numbers some time ago.
Otherwise it might be necessary to find an external examiner/assessor
who does not believe in statistics !
Best of luck,
University of Reading, Soil Science Dept.
AKA P.J.Harris @reading.ac.uk
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