The yellow dyestuff which, in the form of its phosphate ester and combined with a particular protein, forms Warburg’s yellow respiration ferment (1) is a derivative of isoalloxazine (Formula I, with R = H). This was first suggested by Stern and Holiday (2) and definitely proved by Kuhn it al. (3, 4) and Karrer et al. (5). This dyestuff has been identified by GyBrgy, Kuhn, and Wagner-Jauregg (3)...

It has long been known that in acid solution phenazine and related compounds, including N-alkylated derivatives, are oxidized and reduced in distinct l-electron steps, thereby passing through a semiquinoid intermediate (l-4). These semiquinoid forms are stable in acid and have a characteristic green color which readily distinguishes them from the fully oxidized or fully reduced compounds. N-Met...

Antibiotic-sensitive bacteria have been found to coexist with antibiotic-producing bacteria in biofilms, but little is known about how the former develop in such an environment. Here we isolated pyocyanin-sensitive bacteria belonging to the genus Brevibacillus from a biofilm derived from soil extract and based on the preestablished biofilm of a pyocyanin producer, Pseudomonas aeruginosa strain ...