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FIGURE 7.8 (A) Organic matter profiles obtained in a oligotrophic lake (Lake Geneva, Switzerland). In this figure, the increase in dissolved organic carbon (DOC) in the surface waters can be attributed to an added presence of fibrillar polysaccharides (PS) rather than HS (represented by the vertical curve of ultraviolet (UV) absorbance). Polysaccharides were determined by the spectrometric technique detailed in ref. [110,111]. (B) AFM image showing some important organic macromolecules isolated from a Lake Geneva surface water sample at 15 m (B) and 309 m. (C) Scan size was 5 /m x 5 /m at 15 m and 3 /m x 3 /m at 309 m. (B is taken from Wilkinson, K.J., et al. Colloids and Surfaces, A: Physicochemical and Engineering Aspects, 1999. 155(2-3): p. 287-310 with permission from Elsevier.)

FIGURE 7.8 (A) Organic matter profiles obtained in a oligotrophic lake (Lake Geneva, Switzerland). In this figure, the increase in dissolved organic carbon (DOC) in the surface waters can be attributed to an added presence of fibrillar polysaccharides (PS) rather than HS (represented by the vertical curve of ultraviolet (UV) absorbance). Polysaccharides were determined by the spectrometric technique detailed in ref. [110,111]. (B) AFM image showing some important organic macromolecules isolated from a Lake Geneva surface water sample at 15 m (B) and 309 m. (C) Scan size was 5 /m x 5 /m at 15 m and 3 /m x 3 /m at 309 m. (B is taken from Wilkinson, K.J., et al. Colloids and Surfaces, A: Physicochemical and Engineering Aspects, 1999. 155(2-3): p. 287-310 with permission from Elsevier.)

hydrophobic moieties that will favor their adsorption on surfaces as thin films. Indeed, for model systems, a stabilizing role of certain flexible polysaccharides has also been demonstrated. For example, the adsorption of the flexible (globular) polysaccharide, dextran (40, 150, and 500 kDa) stabilized monodisperse suspensions of sulfate- and amidine-modified polystyrene colloids, similar to what was observed for a HS.118

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