2008
DOI: 10.1016/j.gca.2007.10.032
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Acid–base properties of cyanobacterial surfaces. II: Silica as a chemical stressor influencing cell surface reactivity

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Cited by 17 publications
(4 citation statements)
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“…Indeed, the greater overall size range of the particles at lower Si concentrations may be attributed in part to Ostwald ripening, a process in which-at lower degrees of saturation (growth-dominated or equilibrium regimes)-larger particles continue to grow at the expense of smaller particles that dissolve despite solution saturation (see Boistelle and Astier, 1988, for review). These observations also correlate well with previous studies that have argued that silicification at hot spring systems, where silica concentrations do not typically reach 300 ppm Si, is enhanced by the presence of reactive cell surfaces Yee et al, 2003;Benning et al, 2004aBenning et al, , 2004bKonhauser et al, 2004;Lalonde et al, 2005Lalonde et al, , 2008aLalonde et al, , 2008b, while deposition of preformed particles would be nonpreferential.…”
supporting
confidence: 90%
“…Indeed, the greater overall size range of the particles at lower Si concentrations may be attributed in part to Ostwald ripening, a process in which-at lower degrees of saturation (growth-dominated or equilibrium regimes)-larger particles continue to grow at the expense of smaller particles that dissolve despite solution saturation (see Boistelle and Astier, 1988, for review). These observations also correlate well with previous studies that have argued that silicification at hot spring systems, where silica concentrations do not typically reach 300 ppm Si, is enhanced by the presence of reactive cell surfaces Yee et al, 2003;Benning et al, 2004aBenning et al, , 2004bKonhauser et al, 2004;Lalonde et al, 2005Lalonde et al, , 2008aLalonde et al, , 2008b, while deposition of preformed particles would be nonpreferential.…”
supporting
confidence: 90%
“…Cellular processes important for metabolism, nutrient transport, movement, and cell division are localized at the cell membrane, which is the reactive surface controlling chemical accommodation, and may vary with environment (Konhauser, 2007; Lalonde et al, 2008 a,b). The ability of a given bacterial species to modify its surface chemistry in order to adapt to various environmental stresses depends on the growth phase, regulatory networks, metabolic pathways, and chemical variables in the environment (Warren and Ferris, 1998; Lalonde et al, 2008 a,b).…”
Section: Additional Considerationsmentioning
confidence: 99%
“…The ability of a given bacterial species to modify its surface chemistry in order to adapt to various environmental stresses depends on the growth phase, regulatory networks, metabolic pathways, and chemical variables in the environment (Warren and Ferris, 1998; Lalonde et al, 2008 a,b). There are three general mechanisms by which bacteria can accommodate high concentrations of ions that may be toxic to the species ( i ) the ions may be expelled from the cell by efflux (Nies and Silver, 1995); ( ii ) the metal ions may complex into non-toxic molecules such as thiols (S-compounds) in the surrounding solution, or ( iii ) the metal ions may be reduced to a less toxic oxidation state in the cell (Nies, 1999).…”
Section: Additional Considerationsmentioning
confidence: 99%
“…From these data, we infer that carboxyl, hydroxyl, and amino functional groups within these organisms’ tissues and cell walls provided adsorption sites that were highly reactive to DSi and directly mediated silica precipitation. Previous studies have indicated that hydrogen bonding between silicic acid and hydroxyl groups associated with organic surfaces 54 , 55 favours the formation of silanol (Si–OH) 56 . Other mechanisms, such as electrostatic attraction of Si by amino groups on organic substrates 57 , 58 and cation bridging between carboxyl and negatively charged silica species, may also result in the bonding of silica to organic surfaces 59 (Fig.…”
Section: Resultsmentioning
confidence: 99%