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  • 1970-1974  (2)
  • 1955-1959  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Some Metabolic Inhibitors on the Pigments of Euglena gracilis in an Acidic Medium (1959)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 6 (1959), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Darkness and O2-lack promote formation of a pheophytin-like pigment from chlorophyll in Euglena gracilis in an acidic medium. Dinitrophenol (DNP) produces similar but more drastic pigment alterations in aerated and illuminated cells. The extent of pigment decay was dependent on DNP concentration and external pH. Since volume expansion and inhibition of the contractile vacuole were also noted, it is suggested that pheophytin formation is secondary to hydrogen ion influx from the external medium. Major structural alterations of the chloroplast accompanied the pigment changes.Pentachlorophenol, iodoacetamide, Na fluoride, and Na azide produced similar pigment changes. Malonic acid and fluoroacetate were ineffective under the conditions described. However, in the dark, cells treated with fluoroacetate formed pheophytin rapidly. These effects are discussed in relation to the maintenance of intracellular [H+].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1959.tb04365.x
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  • 2
    Electronic Resource
    Electronic Resource
    Phospholipid—Retinaldehyde Complex absorbing at 500 nm (1970)
    [s.l.] : Nature Publishing Group
    Nature 226 (1970), S. 270-272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Addition of EPG in anhydrous chloroform?methanol to retinaldehyde in the same solvent at room temperature produces an immediate colour change characterized by a rapid increase in absorption in the 450?470 nm region. An additional increase begins at 500 nm within 30 min. Absorption in both regions ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/226270a0
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  • 3
    Electronic Resource
    Electronic Resource
    The nuclear magnetic resonance of heterocyclic compounds related to anthracene (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 115-120 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The NMR spectra of a series of heterocyclic compounds analogous to anthracene have been investigated at 220 and 60 MHz. Correlations have been made with molecular geometry and parameters calculated from semi-empirical MO theory. For planar molecules, the chemical shift of the proton ortho to the heteroatom is linear with respect to the electron density on the heteroatom, but otherwise chemical shifts are independent of electron density. Planarity of the molecules is also a factor in some of the coupling constants.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060213
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    Paper (German National Licenses)
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