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  • 1
    ISSN: 1573-9686
    Keywords: Oxidation reduction ; Methylene blue ; Toluidine blue O ; Ubiquinone ; Mathematical modeling ; Multiple indicator dilution ; Lung cell culture ; Physiome ; Hyperoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The pulmonary endothelium is a chemical reactor that modifies blood composition in several ways, including reduction of the oxidized forms of certain redox active substances in the blood. The physiological functions of the transplasma membrane electron transport systems involved in the latter are not fully understood, but an argument is made that they are involved in antioxidant defense. In addition, the experimental approaches used to characterize the process, including studies at whole organ, cell culture, and subcellular levels, along with the use of mathematical modeling, may be representative of the physiome concept wherein a goal is the integration of information obtained at all levels of biological organization. In this article, separation of intra- and extracellular events involved in the disposition of redox active probes within the lungs is the particular example. © 2000 Biomedical Engineering Society. PAC00: 8716Uv, 8716Dg, 8715Rn, 8719Uv
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5079
    Keywords: EPR ; fluorescence ; Photosystem II ; thermoluminescence ; thylakoid membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recently, a novel procedure to isolate a highly pure and active Photosystem II preparation directly from thylakoid membranes, referred to as PS II–LHC II supercomplex, was reported [Eshaghi et al. (1999) FEBS Lett 446: 23–26]. In addition to the reaction center core proteins, the supercomplex contains all the extrinsic proteins of the oxygen evolving complex and a set of chlorophyll a/b binding proteins. In this paper, the functional properties of this isolated supercomplex are further characterized by using EPR spectroscopy, thermoluminescence, fluorescence relaxation kinetics and flash induced oxygen yield measurements. The PS II–LHC II supercomplex contains, in addition to QA and QB, a small pool of plastoquinone (PQ). Although the isolated complex is no longer membrane bound, it has preserved functional characteristics of a well defined PS II preparation with the exception of some modification of QB sites.
    Type of Medium: Electronic Resource
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