BIOSENSOR

摘要

The present invention relates to a method for evaluating biological effects in a substance which method comprises sampling the substance, subjecting the sample to an assay in the presence of a biosensor engineered with a gene which expresses a light emitting protein and noting the light output; characterised in that the biosensor is eukaryotic and the substance is assayable over any pH between pH1 and pH12. Such a meukaryotic biosensor may be derived from Saccharomyces cerevisiae and is useful in assaying potable waters.