“…3,3 '-Diaminodipropylamine, spermidine, spermine, putrescine, agmatine and diaminopropane were found to be active, while the closely related compounds ornithine, diaminoethane, cadaverine and arcain did not promote growth (Herbst, Glinos & Amundsen, 1955). Similarly, putrescine, spermidine, agmatine and cadaverine have been found to stimulate the growth of the bacterium Neisseria (Martin, Pelczar & Hansen, 1952), and putrescine and cadaverine stimulated the growth of bacteria in the genus V e i l k l l a (Rogosa & Bishop, 1964). Spermidine and spermine were growth factors for lactic acid bacteria, but in this case neither putrescine nor diaminopropane were found to be effective (Kihara & Snell, 1957;Guirard & Snell, 1964).…”