Surface charge and zeta-potential of metabolically active and dead cyanobacteria

Martinez, Raul E.; Pokrovsky, Oleg S.; Schott, Jacques; Oelkers, Eric H.

doi:10.1016/j.jcis.2008.04.041

Cited by 91 publications

(79 citation statements)

References 47 publications

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“…2). These findings were consistent with previously reported results that showed that most microorganisms exhibit a negative zeta potential at pH levels of Ͼ2.0 (35). Evidently, the slr1336::C.K2 mutant cells exhibited a lower zeta potential than wild-type cells, and thus, they may bind cations such as Ca 2ϩ more easily.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms

Jiang

Cheng

Gao

et al. 2013

Appl Environ Microbiol

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Section: Discussionsupporting

confidence: 93%

“…Since the metabolism of cyanobacterial cells can influence their surface potential (35), the zeta potentials of wild-type and slr1336:: C.K2 cells were measured as a function of pH (Fig. 2C).…”

Section: Growth and Ph Changesmentioning

confidence: 99%

Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms

Jiang

Cheng

Gao

et al. 2013

Appl Environ Microbiol

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“…The bacterium was grown in synthetic, lowphosphate (10% of normal content) cyanobacteria BG-11 Freshwater Solution for 3 weeks until the stationary growth phase was attained (c.f. Martinez et al, 2008). Cyanobacterium Gloeocapsa sp.…”

Section: Culture and Characterization Of Cyanobacteriamentioning

confidence: 99%

“…The low-phosphate BG-11 growth medium used for these experiments had the composition of the traditional BG-11 growth medium other than its P content; the low phosphate growth medium contained only 50 lM P, which is 10% that of the traditional medium (c.f. Martinez et al, 2008). The bacteria used in the experiments were pre-cultured in low phosphate BG-11 media before being placed in the reactors.…”

Section: Precipitation Experimentsmentioning

confidence: 99%

Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

Mavromatis

Pearce

Shirokova

et al. 2012

Geochimica et Cosmochimica Acta

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How to cite:Mavromatis, Vasileios; Pearce, Christopher R.; Shirokova, Liudmila S.; Bundeleva, Irina A.; Pokrovsky, Oleg S.; Benezeth, Pascale and Oelkers, Eric H. (2012) AbstractThe hydrous magnesium carbonates, nesquehonite (MgCO 3 Á3H 2 O) and dypingite (Mg 5 (CO 3 ) 4 (OH) 2 Á5(H 2 O)), were precipitated at 25°C in batch reactors from aqueous solutions containing 0.05 M NaHCO 3 and 0.025 M MgCl 2 and in the presence and absence of live photosynthesizing Gloeocapsa sp. cyanobacteria. Experiments were performed under a variety of conditions; the reactive fluid/bacteria/mineral suspensions were continuously stirred, and/or air bubbled in most experiments, and exposed to various durations of light exposure. Bulk precipitation rates are not affected by the presence of bacteria although the solution pH and the degree of fluid supersaturation with respect to magnesium carbonates increase due to photosynthesis. Lighter Mg isotopes are preferentially incorporated into the precipitated solids in all experiments. Mg isotope fractionation between the mineral and fluid in the abiotic experiments is identical, within uncertainty, to that measured in cyanobacteriabearing experiments; measured d 26 Mg ranges from À1.54& to À1.16& in all experiments. Mg isotope fractionation is also found to be independent of reactive solution pH and Mg, CO 3 2À , and biomass concentrations. Taken together, these observations suggest that Gloeocapsa sp. cyanobacterium does not appreciably affect magnesium isotope fractionation between aqueous fluid and hydrous magnesium carbonates.

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“…The values of the isoelectric points for the microorganisms are at pH < 5. These low values are common in the literature (Gélabert et al, 2004;Bundeleva et al, 2011) and imply that activated sludge is negatively charged at pH commonly observed for municipal wastewater On the other hand, detailed experiments have shown that these low values describe dead microorganisms and the real values are higher (Abudalo et al, 2005;Martinez et al, 2008;Michen and Graule, 2010).…”

Section: Microelectrophoresis Of Activated Sludgementioning

confidence: 75%

The use of Potentiometric Mass Titration (PMT) technique for determining the acid-base behavior of activated sludge

2015

Global NEST Journal

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Activated sludge is a biological floc composed of microorganisms, organics, and inorganics and plays an important role in wastewater treatment. The pH of an activated sludge suspension determines the acid -base behavior and the charge of the microorganisms in water. In the present study, the determination of acid -base behavior of activated sludge was performed using microelectrophoresis and Potentiometric Mass Titrations (PMT). For activated sludge that is a complicated biological system, direct microelectrophoresis is not a suitable method for the determination of its ζ-potential. This method leads to a variety of isoelectric point (iep) values due to the presence of different microorganisms in activated sludge. On the contrary, the PMT method used for the first time for activated sludge can provide the overall point of zero charge (pzc) value that is 8.2. In addition, a simple methodology is proposed for the quantitative determination of the overall solid charge as a function of solution pH, which requires only (a) the titration curves of an electrolyte suspension and of the blank electrolyte solution and (b) the calculation of the H + ions consumed for the above titration curves.

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Surface charge and zeta-potential of metabolically active and dead cyanobacteria

Cited by 91 publications

References 47 publications

Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms

Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms

Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

The use of Potentiometric Mass Titration (PMT) technique for determining the acid-base behavior of activated sludge

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Surface charge and zeta-potential of metabolically active and dead cyanobacteria

Cited by 91 publications

References 47 publications

Inactivation of Ca 2+ /H + Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO 2 -Concentrating Mechanisms

Inactivation of Ca 2+ /H + Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO 2 -Concentrating Mechanisms

Magnesium isotope fractionation during hydrous magnesium carbonate precipitation with and without cyanobacteria

The use of Potentiometric Mass Titration (PMT) technique for determining the acid-base behavior of activated sludge

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Product

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Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms

Inactivation of Ca ²⁺ /H ⁺ Exchanger in Synechocystis sp. Strain PCC 6803 Promotes Cyanobacterial Calcification by Upregulating CO ₂ -Concentrating Mechanisms