The accessory bacteriochlorophyll

The primary electron transfer in reaction centers of Rhodobacter sphaeroides is studied by subpicosecond absorption spectroscopy with polarized light in the spectral range of 920-1040 nm. Here the bacteriochlorophyll anion radical has an absorption band while the other pigments of the reaction center have vanishing ground-state absorption. The transient absorption data exhibit a pronounced 0.9-ps kinetic component which shows a strong dichroism. Evaluation of the data yields an angle between the transition moments of the special pair and the species related with the 0.9-ps kinetic component of 26 +/- 8 degrees. This angle compares favorably with the value of 29 degrees expected for the reduced accessory bacteriochlorophyll. Extensive transient absorbance data are fully consistent with a stepwise electron transfer via the accessory bacteriochlorophyll

Vermessen und Teilen - Praktiken und Diskurse des Teilens digitaler Selbstvermessungsdaten

Dieser Lehrforschungsbericht untersucht die Praktiken und Diskurse beim Umgang mit persönlichen Körperdaten, die mittels digitaler Selbstvermessung erfasst werden. Werden Körpderdaten wie Puls, Gewicht, Laufstrecke, Essverhalten etc geteilt und wenn ja, wie? Die Forschungsgruppe führte dazu Interviews mit Nutzern solcher Selbstvermessungsgeräte und machte Diskursanalysen zu Fitness, Gesundheit und Datennutzung. Die Forschungsdaten wurden sowohl praxistheoretisch interpretiert als auch mit den Techniken der Situationsanalyse strukturiert. Dieses Vorgehen bettete sich in den Forschungsstil der Grounded Theory ein

The accessory bacteriochlorophyll

The primary electron transfer in reaction centers of Rhodobacter sphaeroides is studied by subpicosecond absorption spectroscopy with polarized light in the spectral range of 920-1040 nm. Here the bacteriochlorophyll anion radical has an absorption band while the other pigments of the reaction center have vanishing ground-state absorption. The transient absorption data exhibit a pronounced 0.9-ps kinetic component which shows a strong dichroism. Evaluation of the data yields an angle between the transition moments of the special pair and the species related with the 0.9-ps kinetic component of 26 +/- 8 degrees. This angle compares favorably with the value of 29 degrees expected for the reduced accessory bacteriochlorophyll. Extensive transient absorbance data are fully consistent with a stepwise electron transfer via the accessory bacteriochlorophyll