+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Gramicidin in chromatophores of rhodobacter sphaeroides

, : Gramicidin in chromatophores of rhodobacter sphaeroides. European Biophysics Journal 19(4): 213-216

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 behavior, with a fast phase relaxing at some .mu.s, 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).


DOI: 10.1007/bf00196347

Other references

Hoffmann, H-Heinrich.; Palese, P.; Shaw, M.L., 2008: Modulation of influenza virus replication by alteration of sodium ion transport and protein kinase C activity. In recent years, increasing levels of resistance to the four FDA-approved anti-influenza virus drugs have been described and vaccine manufacturers have experienced demands that exceed their capacity. This situation underlines the urgent need for n...

Martin, G.R., 1992: Starch strikes back. Hospital Practice 27(2a): 18-18

Seriani, M., 1988: Nota su alcuni carabidi del Friuli Venezia Giulia (Coleoptera, Carabidae). Atti del Museo Civico di Storia Naturale di Trieste, 411: 79-83

Aguiar, F.A.; Campos, R.; Wang, C.; Jitchati, R.; Batsanov, A.S.; Bryce, M.R.; Kataky, R., 2011: Comparative electrochemical and impedance studies of self-assembled rigid-rod molecular wires and alkanethiols on gold substrates. A study of the charge transfer and self-assembly characteristics of two new rigid-rod molecular wires 1 and 2 assembled on polycrystalline gold electrodes was carried out using electrochemical impedance spectroscopy and cyclic voltammetry. This cl...

Schlingman, A.S.; Devlin, H.B.; Wright, G.G.; Maine, R.J.; Manning, M.C., 1956: Immunizing activity of alum-precipitated protective antigen of Bacillus anthracis in cattle, sheep, and swine. Cattle, sheep, and swine were immunized by subcutaneous injection of two 5 ml doses of an alum precipitated antigen prepared from sterile culture filtrates of either the NPA or RI-NP strains of B. anthracis grown in chemically-defined medium. Thes...

Anonymous, 1993: Annual report 1992. 1. Pig breeding. During 1992, in Switzerland, the number of Swiss Edelschwein herdbook pigs increased by 2.24% and that of Swiss Improved Landrace herdbook pigs decreased by 6.27%. For herdbook sows of the 2 breeds, the av. number of liveborn piglets per [female]...

Oliver, E.R.; DeBari, S.E.; Giannone, M.M.; Pogoriler, J.E.; Johnson, A.M.; Horii, S.C.; Gebb, J.S.; Howell, L.J.; Adzick, N.Scott.; Coleman, B.G., 2017: Going With the Flow: An Aid in Detecting and Differentiating Bronchopulmonary Sequestrations and Hybrid Lesions. To assess the ability of prenatal ultrasound (US) in identifying systemic feeding arteries in bronchopulmonary sequestrations and hybrid lesions and report the ability of US in classifying bronchopulmonary sequestrations as intralobar or extraloba...

Holste, T.; Stark, H., 1990: Bond between telescopic crown and prosthetic framework from periodontal prophylactic viewpoint. Phillip Journal 7(2): 83-86

Notni, J.; Wester, H-Jürgen., 2017: Re-thinking the role of radiometal isotopes: Towards a future concept for theranostic radiopharmaceuticals. The potential and future role of certain metal radionuclides, for example, <sup>44</sup> Sc, <sup>89</sup> Zr, <sup>86</sup> Y, <sup>64</sup> Cu, <sup>68</sup> Ga, <sup>177</sup&...

Coffman, J.A.; Nasrallah, H.A., 1984: Statistical "noise" in CAT scan measurements. American Journal of Psychiatry 141(10): 1311-1312