Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Hilary E. Tillett"'
Publikováno v:
Water Science and Technology. 43:19-22
Data which are collected in order to estimate the correlation between parameters must be analysed with caution. Classical statistics of correlation are often inappropriate. The “r” statistic is very easily distorted by non-Normal data. Non-parame
Autor:
N.F. Lightfoot, Hilary E. Tillett
Publikováno v:
Water Science and Technology. 31:471-477
Organism counts from environmental quality control (QC) samples, such as indicators in water, will show variation even if they come from a single well mixed batch. This is due to random variation and there may be additional effects from organism beha
Publikováno v:
Journal of Applied Bacteriology. 74:497-502
A UK-based scheme of water microbiology assessment requires participants to record counts of relevant organisms. Not every sample will contain the target number of organisms because of natural variation and therefore a range of results is acceptable.
Autor:
Hilary E. Tillett
Publikováno v:
Water Science and Technology. 27:15-18
The procedures for estimating numbers of organisms in water lead potentially to large inaccuracies. Routine microbiological sampling is an important component of monitoring source waters for drinking supplies and recreational waters. The results shou
Autor:
Hilary E. Tillett, C.P. Farrington
Publikováno v:
Letters in Applied Microbiology. 13:168-170
Samples, such as raw waters, which contain large numbers of organisms will need to be pre-diluted before culture, in order to count or estimate the numbers present. This introduces a further approximation into the results obtained from routine sampli
Autor:
Hilary E. Tillett
Publikováno v:
Water Research. 29:1213-1214
Autor:
Hilary E. Tillett
Publikováno v:
Epidemiology and Infection. 105:644-645
Autor:
Hilary E. Tillett
Publikováno v:
Epidemiology and Infection. 108:559-559
Autor:
Hilary E. Tillett
Publikováno v:
International Journal of Epidemiology. 15:126-133
At the Communicable Disease Surveillance Centre most outbreak investigations are carried out by questioning cases and unaffected 'controls' to look for associations with possible sources of infection. Illness rates are compared in those exposed with
Autor:
Rodney Coleman, Hilary E. Tillett
Publikováno v:
Journal of Applied Bacteriology. 59:381-388
Published tables of Most Probable Numbers (MPN) used in water bacteriology make the assumption that the sample is representative of a large body of water in which the bacteria are randomly distributed. MPN values for certain dilution series are calcu