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  • 1
    Electronic Resource
    Electronic Resource
    Proton and carbon-13 nuclear magnetic resonance studies of the polar lipids of Halobacterium halobium (1980)
    s.l. : American Chemical Society
    Biochemistry 19 (1980), S. 1626-1631 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00549a016
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolic cost of sodium transport and the degree of coupling of transport and metabolism in toad urinary bladder (1978)
    Springer
    The journal of membrane biology 41 (1978), S. 189-194 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01972632
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  • 3
    Electronic Resource
    Electronic Resource
    Proteolysis and flash photolysis of bacteriorhodopsin in purple membrane fragments (1978)
    Springer
    European biophysics journal 4 (1978), S. 301-313 
    Details
    ISSN: 1432-1017
    Keywords: Halobacterium halobium ; Pronase ; Gel electrophoresis ; Photocycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Pronase treatment of aqueous suspensions of purple membrane fragments from H. halobium leads to the cleavage of bacteriorhodopsin. The protein fragments remaining in the membrane after treatment with relatively small concentrations of enzyme (2% w/w) in normal daylight range in molecular weight from 20,000-21,000 daltons, indicating that cleavage occurs mainly near the extremities of the protein chain. At higher enzyme concentrations the relative amounts of protein fragments having smaller molecular weight increase. Generally, the relative loss of retinal chromophore is larger than that of protein and thus the retinal binding site seems to be located near one of the chain ends that is cleaved off by enzyme. Irradiation with white light during the time of proteolysis (at both low and high enzyme concentrations) results in extensive cleavage, so that under certain conditions no high molecular weight components can be detected in SDS-polyacrylamide gels. It, therefore, appears that parts of the bacteriorhodopsin chain become more exposed to enzyme digestion when the purple membrane is illuminated. Enzyme treated aqueous purple membrane fragment suspensions still show photocycle activity. The main consequence of proteolysis is a pronounced appearance of biphasicity in the decay of M412 and the regeneration of bR570. Simultaneously the yield of O660 is reduced. As with untreated purple membrane, the correlation between the rates of decay of M412 and regeneration of bR570 is greatest when the yield of O660 is lowest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00537613
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  • 4
    Electronic Resource
    Electronic Resource
    Biogenesis of the purple membrane of Halobacterium halobium (1977)
    Springer
    European biophysics journal 3 (1977), S. 1-17 
    Details
    ISSN: 1432-1017
    Keywords: Purple membrane ; Bacteriorhodopsin ; Biosynthesis ; Retinal ; Nicotine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract A protein closely resembling the purple membrane protein pre-exists in the cell membrane of H. halobium prior to the appearance of functional bacteriorhodopsin. It is associated with a differentiated membranous structure which has been isolated on a sucrose gradient and appears to be a precursor of the purple membrane. The identity of the precursor protein as a form of the purple membrane protein was established in different ways: (1) The cell proteins were labelled in vivo with 14C-proline during dark aerobic growth, the label was “chased”, and the cells transferred to the illuminated near-anaerobic conditions under which purple membrane is optimally synthesised (induction conditions). Cell lysates were fractionated on sucrose gradients at different times after induction. Label first found in the precursor fraction appeared within 24 h in the purple membrane fraction. (2) SDS-urea-acrylamide gel electrophoresis of the purple membrane protein and the precursor showed only one protein band whose migration coincided with that of the purple membrane band. (3) The amino-acid analysis of the purified precursor was very similar to that of the purple membrane. The absorption spectrum of the precursor showed little of the characteristic absorption of bacteriorhodopsin at 570 nm. A major band appears at 412 nm, the exact nature of which is not known. The difference spectrum (reduced versus oxidised) of a purified fraction showed only traces of cytochrome. Thin-layer chromatography of an acetone-soluble lipid extract indicated the presence of retinal and Β-carotene. Cells grown in the presence of nicotine did not develop purple membrane after induction: the species absorbing at 412 nm was much less abundant than in non-inhibited cells, but a new fraction was present with a sharp peak at 345 nm consisting mainly of lycopene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536449
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  • 5
    Electronic Resource
    Electronic Resource
    Light-induced conductivity changes in purple membrane suspensions (1979)
    Springer
    European biophysics journal 5 (1979), S. 313-320 
    Details
    ISSN: 1432-1017
    Keywords: Bacteriorhodopsin ; Conductivity ; Modulation excitation ; Purple membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Small light-induced changes in the conductivity of light-adapted purple membrane suspended in strong electrolyte solutions were detected. The method used involved modulated light and a phase sensitive detector and it allowed us to detect accurately changes as small as 0.0001% in the conductivity of the suspension. The light-induced conductivity changes turned out to be composed of at least two different events: a small fast increase in conductivity (t ∼ 2 ms) followed by a slower and larger decrease in this parameter (Τ=70 ms-80 ms). The effects of pH and temperature on these changes were studied. Both events reached maximal values around neutral pH and approached zero at both high and low pH's. Heating the suspension decreased the photoconductivity change and Arrhenius plots of the data showed breaks around 31
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02426665
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  • 6
    Electronic Resource
    Electronic Resource
    A Synergic Method of carrying out Continuous Electrochromatography (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 378-379 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It seems likely that improved electrochromato-graphic separations might be achieved by substituting ion-exchange membrane 'curtains' for paper ones. In this way a stationary phase capable of highly selective sorption could be provided, within which particles would be immobilized with respect to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185378a0
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  • 7
    Electronic Resource
    Electronic Resource
    Stoichiometry and Coupling: Theories of Oxidative Phosphorylation (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 610-611 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sources of non-stoichiometry or uncoupling can be divided into two categories: scalar sources and vectorial sources (processes respectively independent of and dependent on the symmetry of the system). Considering the scalar sources, a general scheme involving two coupled reactions is shown in Fig. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/216610a0
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  • 8
    Electronic Resource
    Electronic Resource
    Oscillatory Enzymes (1976)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biophysics and Biomolecular Structure 5 (1976), S. 449-476 
    Details
    ISSN: 0084-6589
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bb.05.060176.002313
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  • 9
    Electronic Resource
    Electronic Resource
    The Degree of Coupling and Efficiency of Fuel Cells and Membrane Desalination Processes (1965)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 69 (1965), S. 3801-3804 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100895a027
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  • 10
    Electronic Resource
    Electronic Resource
    The Choice of Reference Frame in the Treatment of Membrane Transport by Nonequilibrium Thermodynamics (1966)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 70 (1966), S. 3049-3056 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100882a006
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