Pseudomonas aeruginosa infections of healthy skin are uncommon. We report four cases of P. aeruginosa infections of intact skin. These cases illustrate the clinical spectrum of these cutaneous infections: localized, mild epidermal infections (the green nail syndrome and webbed space infections), moderately serious infections (cutaneous folliculitis and otitis externa), and, in immunocompromised patients, extremely serious infections (malignant otitis externa, perirectal infection, and ecthyma gangrenosum).
The construction of a simple direct methanol fuel cell (DMFC) for didactic purposes is described. Black platinum catalyst was electrolytically deposited on 0.3-mm-diameter nickel–chromium wire at −0.53 V vs RHE (corresponding to 8 mA/cm2 current) for 30 min from 0.02 M H2PtCl6–1 M HCl aqueous solution. Fifty milliliters of this solution allowed platinization of several dozen electrodes. Platinum catalyst was used for both compartments of the fuel cell, whose electrodes had 2 cm2 of active surface, with 1 M sulfuric acid electrolyte. Pseudo salt bridges, made with 2-mm-i.d. plastic tubing, connected anodic to cathodic compartments. The cell was operated by adding 30 mg/mL of methanol at the anode while bubbling air at the cathode. The device produced 0.7 V potential, with 600 µA short-circuit current. Five of these DMFC elements connected in series could supply an electric clock.
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