Cellsofthisstrainincreasetheintensityofredcolorpro-
duced proportionallytotheconcentrationofcopperionsinin-
cubation medium,allowingthedetectionofcopperionsinthe
rangeof1–100 μM. Thesystemwasoptimizedfortheuseoftester
strain cellsimmobilizedinalginatebeadsandstaticincubationin
the presenceofvariouscopperionconcentrationsundercondi-
tions oflowaeration.The final colorationofthebeadsdevelops
quickly(in30–60 min)afterthebeadsareexposedtoaerialoxy-
gen.