Hydrophilicity of Ferroplasma acidiphilum and its effect on the depression of pyrite

Growth-dependent surface characteristics of Hansenula Polymorpha: implications for expanded bed adsorption chromatography

“…The above observed results can be explained on the fundamental changes occurring on the cell surface compositions during fermentation when the medium is depleted of necessary nutrients, resulting in the rearrangements of the cell wall, in terms of the hydrophobicity and adhesion. These phenomenon have also been observed in other yeasts like in nutrient-depleted S. cerevisiae in which specific changes to the cell at the level of the cell-wall organization, nutrient consumption, and cellular interactions with the surrounding environment occurred during different growth phases [26,29,39]. Analytically, the significance of these trends emerges in Table 3, where Lifshitz-van der Waals (∆G LW ) and acid-base (∆G AB ) interaction free energies of the biomass phases with different adsorbents have been calculated.…”

“…Since microbial cell surface properties like hydrophobicity and surface charge depend on the nutritional composition medium [29], reduction in nitrogen source (starvation) induces the production of a cell-wall glycoproteins (O-mannosylated protein) [21,22,29], that become phosphorylated at different growth phases thereby giving the outer cell surface of yeast negatively charged groups [26], hence providing an anionic surface charge i.e. the increase in the characteristic negative charge observed in H. polymorpha through its growth, a similar effect observed in Ferroplasma acidiphilum [29]. As expected, in high salt conditions, zeta potentials are significantly reduced from up to -12 mV to roughly the same value of ca.…”

“…Understanding the ability of cell surfaces to effectively interact with adsorbents can positively help in defining conditions suitable for application in industrial downstream bioprocessing of therapeutics and several other biological processes like biobeneficiation, bioleaching, bioremediation and biodeterioration [29,30]. We have additionally supplemented theoretically calculated interaction energies with experimental cell partition indices (CTI), thereby establishing an important link between the nanoscale (via xDLVO calculations) and the process scale (via CTI experiments).…”

Review of Potential Microbial Effects on Flotation

“…The focus in previous research has been on bioflotation and flocculation of sulphide minerals, with very little effort on oxide minerals [1]. Bioflotation has been tested with various microorganisms for quartz [27], with Rhodococcus opacus in phosphate flotation [23], with Staphylococcus carnosus for fine coal tailings [28], with Bacillus pumilus, Alicyclobacillus ferrooxidans [29] and Ferroplasma acidiphilum for pyrite [30], and with Bacillus megaterium for selective flotation of sphalerite from a mineral mixture consisting of sphalerite and galena [31]. Merma et al [32] showed that apatite-adapted Rhodococcus opacus cells increased the upper pH range for floatability of apatite from pH 7 to pH 9, and that these cells could be used as collector improving the separation of apatite from quartz, within a selective narrow window around pH 3.…”

“…Ferroplasma acidiphilum Good depressant for pyrite. 2.5-10 37 [30] Bacillus megaterium Selective flotation of sphalerite from sphalerite-galena. 2-10 room temp.…”