Morning light: In vivo photodissociation of CO from bacterial c‐type cytochromes yields a redox‐active Fe2+ form, which can be oxidized at an electrode surface to the Fe3+ form. Reduction by electrons from the metabolic pathway regenerates the Fe2+ form (see picture). Spectroscopic monitoring of this process yields information on the in vivo respiratory electron‐transport dynamics.
The effects of artificial porphyrins on the electron-transport chains of living microbes were investigated. The participation of porphyrins in the microbial electron-transport chains was demonstrated by spectroscopic and current-generation measurements. Large enhancement of the microbial current generation was accomplished by adding a cationic water-soluble manganese porphyrin as an electron mediator.
Morgenlicht: Die In‐vivo‐Photoabspaltung von CO von bakteriellen c‐Typ‐Cytochromen ergibt eine redoxaktive Fe2+‐Form, die an einer Elektrodenoberfläche zur Fe3+‐Form oxidiert werden kann. Diese wird durch Elektronen aus metabolischen Prozessen in die Fe2+‐Form rücküberführt (siehe Bild). Die spektroskopische Verfolgung dieses Prozesses liefert Informationen über die Dynamik des In‐vivo‐Elektronentransports der Atmungskette.
The possibility of using Raman scattering as a method of molecular density measurements in low pressure discharge plasmas has been investigated. Firstly, the detection limit of Raman signal was examined in low pressure air. It was shown that the Raman scattering from nitrogen molecules was detectable down to 0.06 Pa (particle density of 1.4×1019 m-3) when a photon counting detection system was used. The method was then applied to detect methane and its reaction products in an electron cyclotron resonance plasma operated at a pressure of 50 Pa. Densities of CH4, C2H2, C2H6 and H2 were absolutely determined using the calibrated data of the optical system. Also, it was clearly demonstrated that the gas composition in the discharge was dependent on gas flow rate. These experimental results showed the usefulness of the method for quantitative measurements of molecular densities in processing plasmas.
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