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  • 1
    Electronic Resource
    Electronic Resource
    Complete tracking of proton flow in thylakoids-the unit conductance of CF"0 is greater than 10 fS
    Amsterdam : Elsevier
    FEBS Letters 203 (1986), S. 289-294 
    Details
    ISSN: 0014-5793
    Keywords: CF"0 ; H^+-ATPase ; Photosynthesis ; Unit conductance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(86)80760-8
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  • 2
    Electronic Resource
    Electronic Resource
    A voltage-dependent chloride channel in the photosynthetic membrane of a higher plant (1988)
    [s.l.] : Nature Publishing Group
    Nature 336 (1988), S. 589-592 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As in previous experiments with impalement microelec-trodes6'7 giant chloroplasts of P. metallica were used. Protoplasts Fig. 1 Light microscopy (Nomarski interference contrast) of a, a protoplast (30 (xm in diameter) and 6, osmotically swollen thylakoids ('blebs'; same scale) of Peperomia ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/336589a0
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  • 3
    Electronic Resource
    Electronic Resource
    Gramicidin in chromatophores of Rhodobacter sphaeroides (1991)
    Springer
    European biophysics journal 19 (1991), S. 213-216 
    Details
    ISSN: 1432-1017
    Keywords: Photosynthesis ; Chromatophore ; Gramicidin ; Electrochromism ; Size analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Chromatophores of Rhodobacter sphaeroides were excited with light flashes to generate a transmembrane electrical potential difference. The electric relaxation was measured by electrochromic absorption changes as a function of added gramicidin. At low gramicidin/bacteriochlorophyll (BChl) molar ratios the decay of the electrochromic absorption changes showed a biphasic behaviour, with a fast phase relaxing at some μs, and a slow phase relaxing at more than 100 ms. This was attributable to a mixture of vesicles containing gramicidin dimers with others containing none. The concentration dependence of this effect was linear. This implied full dimerization of gramicidin. The data were interpreted to yield an average bacteriochlorophyll content per chromatophore of 770(±150) and the conductance of a single gramicidin dimer in the chromatophore membrane of 15(±4) pS (in about 115 mM KCl).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196347
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  • 4
    Electronic Resource
    Electronic Resource
    Ion Channel Permeable for Divalent and Monovalent Cations in Native Spinach Thylakoid Membranes (1996)
    Springer
    The journal of membrane biology 152 (1996), S. 223-233 
    Details
    ISSN: 1432-1424
    Keywords: Key words: Cation channel — K+, Ca2+ and Mg2+ permeability — Voltage gating — Patch-clamp — Thylakoid membrane — Spinach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. A cation-selective channel was characterized in isolated patches from osmotically swollen thylakoids of spinach (Spinacea oleracea). This channel was permeable for K+ as well as for Mg2+ and Ca2+ but not for Cl−. When K+ was the main permeant ion (symmetrical 105 mm KCl) the conductance of the channel was about 60 pS. The single channel conductance for different cations followed a sequence K+ 〉 Mg2+≥ Ca2+. The permeabilities determined by reversal potential measurements were comparable for K+, Ca2+, and Mg2+. The cation channel displayed bursting behavior. The total open probability of the channel increased at more positive membrane potentials. Kinetic analysis demonstrated that voltage dependence of the total open probability was determined by the probability of bursts formation while the probability to find the channel in open state within a burst of activity was hardly voltage-dependent. The cation permeability of intact spinach thylakoids can be explained on the single channel level by the data presented here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900100
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  • 5
    Electronic Resource
    Electronic Resource
    Patch clamp study of the voltage-dependent anion channel in the thylakoid membrane (1995)
    Springer
    The journal of membrane biology 148 (1995), S. 143-156 
    Details
    ISSN: 1432-1424
    Keywords: Anion channel ; Channel gating ; Patch clamp ; Thylakoid membrane ; Nitellopsis obtusa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Measurements of single channel currents were performed on isolated membrane patches from osmotically swollen thylakoids of the Charophyte alga Nitellopsis obtusa. A channel with a high selectivity for anions over cations and a conductance of 100 to 110 pS (114 mM Cl−) was revealed. The channel has a bells-haped voltage-dependence of the open probability, with a maximum at about 0 mV. This dependence was explained by two gating processes, one causing channel closure at positive and one at negative potentials. The steepness of the voltage-dependence corresponded to approximately 2 elementary charges to be transferred across the entire membrane in each of the two gating processes. The analysis of the anion channel kinetics in the millisecond time domain revealed an e-fold increase of mean open and decrease of mean closed times when the membrane voltage was made more positive by 20 and 36 mV, respectively. Concert transitions of two identical anion channels between open and long inactivated states were observed, while the millisecond closed-open transitions of the two channels within a burst of activity were kinetically independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207270
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  • 6
    Electronic Resource
    Electronic Resource
    Cytosolic Ca2+ and H+ buffers in green algae: A comment (1998)
    Springer
    Protoplasma 203 (1998), S. 206-209 
    Details
    ISSN: 1615-6102
    Keywords: Cytosolic buffer capacity ; Cytosolic calcium concentraton ; Cytosolic pH ; Data analysis ; Eremosphaera viridis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Recently Plieth et al. [Protoplasma (1997) 198: 107–124; 199: 223] gave a quantitative picture of the Ca2+ and H+ buffers in green algae which we would like to comment. In that paper a mechanistic model was derived which describes the relationship between cytosolic Ca2+ and H+ assuming that Ca2+ and H+ interact with the same binding site of a Ca2+-H+-exchange buffer. But the increase of the cytosolic free Ca2+ concentration observed upon acidification can alternatively be described by a co-operative (n=2) protonation of a Ca2+/H+-binding buffer pointing to an allosteric mechanism of Ca2+ liberation. Furthermore we present evidences that the cytosolic buffer capacities for H+ (90 mM/pH) and Ca2+ (20 mM/pCa) given for Eremosphaera viridis were overestimated by a factor of three and three orders of magnitude, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279477
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