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  • 1
    ISSN: 1432-2234
    Schlagwort(e): Chemical bond formation ; Condensed systems ; Semiconducting ; Electrochemical dark ; Photoprocesses
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Quantum theoretical models of chemical bond formation and partial charge transfer processes in condensed systems, and their extension to processes in electronic non-equilibrium are investigated in this paper with a view to further exploration of electrochemical and photoelectrochemical kinetics on semiconductors. Electrochemical dark and photocurrents on n-III-V-semiconductors are correlated with calculated transition probabilities for atom-group transfer over larger distances (80 to 240 pm), leading to a first estimate of potential surface shapes compatible with experiment. Some specific problems connected with transition probability calculations for heavy-particle transfer in strong anharmonic potentials are considered in detail, including approximation of Franck-Condon transitions in arbitrary potentials by their classical limit.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1573-5044
    Schlagwort(e): callus ; photomixotrophic ; secondary metabolites ; slash pine ; suspension ; callus ; ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Photomixotrophic callus and suspension cultures of salsh pine (Pinus elliottii var. elliottii Engelm.) have been established. Callus tissues contained up to 2.76 μg chlorophyll mg-1 dry wt and suspensions 2.98 μg chlorophyll mg-1 dry wt. Maximum photosynthetic oxygen evolution was 25–32 μmol O2 h-1 mg-1 chlorophyll for callus and 35–39 μmol O2h-1 mg-1 chlorophyll for suspension, respectively. Photomixotrophic callus was friable with a high moisture content during early and exponential growth, but evolved into a compact and dense tissue during the latter stage of growth. Compact photomixotrophic callus accumulated and deposited secondary metabolites in the central vacuole and developed large starch granules in the chloroplasts. Secondary metabolites were not observed in photomixotrophic suspensions or in heterotrophic calli and suspensions. Photomixotrophic callus contained numerous mitochondria closely associated with well-developed chloroplasts containing 2–6 thylakoids per granum. Heterotrophic callus was characterized by a poorly developed cytoplasm and cup-shaped mitochondria.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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