Photosynthetic microorganisms are expected to be useful to maintain an oxygenic atmosphere and to provide biomass for astronauts in the International Space Station as well as in future long-term space flights. However, fluxes of complex ionizing radiation of various intensities and energies make space an extreme environment for the microorganisms, affecting their photosynthetic efficiency. To automatically monitor the photosynthetic photosystem II (PSII) activity of microorganisms under space conditions an optical biosensor, which utilizes chlorophyll fluorescence as biological transduction system, was built; the PSII activity was monitored by the biosensor during balloon flights at stratospheric altitudes of about 40 km. The effect of space stress on quantum yield of PSII varied among the tested species depending on the growth light conditions at which they were exposed during the flights.
The effect of ionising radiation on photosynthetic oxygenic microorganisms for survival in space flight revealed by automatic photosystem II-based biosensors
Der Einfluss ionisierender Strahlung auf photosynthetische oxygene Mikroorganismen für das Überleben bei der Raumfahrt, festgestellt durch automatische Photosystem-II-basierte Biosensoren
2006
4 Seiten, 2 Bilder, 1 Tabelle, 9 Quellen
Aufsatz (Konferenz)
Englisch
Mikroorganismus , Mikroorganismusstoffwechsel , Photosynthese , Astronautik , Sauerstoff , Produktion , Raumstation , ionisierende Strahlung , Strahlungswirkung , Effizienz , Bioaktivität , automatische Steuerung , Schwerelosigkeit , optischer Biosensor , Fluoreszenz , Ballondynamik , Quantenausbeute , Zellkultur , Neutronenbestrahlung , Gravitation , Stratosphäre , ESS (Environmental Stress Screening) , Alge
Survival of microorganisms in space: A review
Elsevier | 1981
|Ionising Radiation-Induced Effects in Doped Germanium FIR Photoconductors
British Library Online Contents | 1992
|Electrical conductivity of polymers under ionising radiation & its prediction methods
British Library Online Contents | 1997
|