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- W2050458218 abstract "1. Spinach leaves were homogenized in a phosphate or Tris buffer medium containing 0.35 M sucrose and were filtered through filter paper. The particle suspension thus obtained was fractionated by differential centrifugation. 2. The particle fractions sedimenting from 47000 to 105500 × g excreted Spinach Protein Factor, a soluble colourless protein that enhances the light sensitivity of colloidal chlorophylls. 3. Upon fractionation of the combined fractions mentioned under 2 on a sucrose gradient, three types of particle fractions showed up: (a) Colourless small particles (0.01–0.02 μ), presumably ribosomes. (b) A green fraction, mainly consisting of thylakoids (about 0.15 μ), characterized by a very high chlorophylla/chlorophyllb ratio, a high 740/685–695nm fluorescence (−196°) ratio, a high NADP+ photo-reduction capacity and a very low or no Hill reaction capacity. (c) A green fraction, mainly consisting of thylakoids (about 0.3 μ), characterized by a lower chlorophylla/chlorophyllb ratio than that of the particle fraction mentioned under b, a lower 740/685–695nm fluorescence (−196°) ratio, a lower NADP+ photoreduction capacity and a high Hill reaction capacity. Spinach Protein Factor diffused from this particle fraction. 4. Evidence is presented that the particles, mentioned under 3b and 3c, are not chloroplast fragments formed during the homogenization procedure of the spinach leaves but were already present in the leaf. 5. A high Spinach Protein Factor activity from particle diffusates coincided with a high 2,6-dichlorophenolindophenol-oxidase activity. 6. The results are discussed with reference to Systems I and II of photosynthesis." @default.
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- W2050458218 date "1970-08-01" @default.
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- W2050458218 title "Particle fractionation from spinach leaf homogenates and diffusion of spinach protein factor" @default.
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- W2050458218 doi "https://doi.org/10.1016/0005-2728(70)90169-6" @default.
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