(containing 10 g trytone, 5 g yeast extract, 50 g NaCl,100 mg tryptamine, 100 mg phenylethylamine, 100 mg putrescine, 100 mg cadaverine, 100 mg histamine,100 mg tyramine, 100 mg spermidine, 100 mg spermine, 20 g agar per litre of distilled water, pH 7.0).