The charging capacitance of the chromatophore membrane

Packham, Nigel K.; Berriman, John; Jackson, John L.

doi:10.1016/0014-5793(78)80218-x

Cited by 73 publications

(29 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where C is the specific capacitance, which varies typically between 0.2 and 1 Fm À2 in biological membranes [138]. The Stern model is effectively a serial combination of the constant capacitance and Gouy-Chapman model.…”

Section: Octanol-water Partitioningmentioning

confidence: 99%

Chemical Speciation of Organics and of Metals at Biological Interphases

Escher

Sigg

2004

Physicochemical Kinetics and Transport at Biointerfaces

View full text Add to dashboard Cite

Section: Octanol-water Partitioningmentioning

confidence: 99%

Chemical Speciation of Organics and of Metals at Biological Interphases

Escher

Sigg

2004

Physicochemical Kinetics and Transport at Biointerfaces

View full text Add to dashboard Cite

“…The volume fraction, P, could then be obtained from the known yeast concentration, C, in mg dry weight/crd, provided that the specific enclosed volume of the cells, V,,, in cm3/g dry weight, was known, since P = V,,C/1000. However, the sensitivity of the plot of equation (7), for a chosen C, value of 1 pF/cm2 [2,12,52,63], to the specific volume chosen, exceeds that of the experimental accuracy in obtaining specific enclosed volumes using even the best isotope dilution methods (see e.g. Refs.…”

Section: Low-frequency Permittivity Datamentioning

confidence: 99%

The radio-frequency dielectric properties of yeast cells measured with a rapid, automated, frequency-domain dielectric spectrometer

Harris

Kell

1983

Journal of Electroanalytical Chemistry and Interfacial Electroc

View full text Add to dashboard Cite

SYMBOLS USED IN THIS PAPER E'real part of the complex permittivity 0' -0,' c'f = -imaginary part of the permittivity; dielectric loss 2afc.dielectric constant of free space = 8.854 X 10-14 F/cm real part of the complex conductivity E;) imaginary part of the complex conductivity measuring frequency (Hz) characteristic frequency of a dispersion (Hz) membrane capacitance per unit area volume fraction of cell-membrane-bounded space ratio of low frequency conductivity to conductivity of suspending medium cell radius thickness of cell membrane and wall relaxation time specific enclosed volume (cm3/g dry weight)Subscripts limiting value at low frequencies limiting value at high frequencies suspending medium* To whom all correspondence should be addressed.0302-4598/83/$03.00 0 1983 Elsevier Sequoia S.A. SUMMARY(1) A computerized, rapid-scanning, frequency-domain dielectric spectrometer, capable of operating in the range 5 Hz-13 MHz, and based on commercially available components, is described.(

show abstract

“…In electron micrographs the shape of chromatophores of Rhodobacter sphaeroides is approximately spherical with a, somewhat dependent on the preparation, mean vesicle diameter of about 60 nm (Saphon et al 1975;Packham et al 1978;Casadio et al 1988).…”

Section: Introductionmentioning

confidence: 99%

Gramicidin in chromatophores of Rhodobacter sphaeroides

1991

View full text Add to dashboard Cite

Abstract. Chromatophores of Rhodobacter sphaeroideswere excited with light flashes to generate a transmembrane electrical potential difference. The electric relaxation was measured by electroehromic absorption changes as a function of added gramicidin. At low gramicidin/baeteriochlorophyll (BChl) molar ratios the decay of the electrochromic absorption changes showed a biphasic behaviour, with a fast phase relaxing at some gs, 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 KC1).

show abstract

The charging capacitance of the chromatophore membrane

Cited by 73 publications

References 25 publications

Chemical Speciation of Organics and of Metals at Biological Interphases

Chemical Speciation of Organics and of Metals at Biological Interphases

The radio-frequency dielectric properties of yeast cells measured with a rapid, automated, frequency-domain dielectric spectrometer

Gramicidin in chromatophores of Rhodobacter sphaeroides

Contact Info

Product

Resources

About