Investigating the Interaction Between Streptomyces sp. and Titania/Silica Nanospheres

Augustyniak, Adrian; Cendrowski, Krzysztof; Nawrotek, Paweł; Barylak, Martyna; Mijowska, Ewa

doi:10.1007/s11270-016-2922-z

Cited by 17 publications

(21 citation statements)

References 36 publications

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“…Particles under shear start to deflocculate and thus the viscosity difference, with or without NS, decreases. This is also confirmed by the observation that yield-stress increase is even more significant in the presence of seawater, whose ions at high concentrations decrease the Debye-length of the NS, consequently leading to an even stronger flocculation of the system (Metin et al 2011;Mijowska et al 2015;Augustyniak et al 2016;Daghlan Sofla et al 2018;Wang et al 2018).…”

Section: Initial and Final Setting Timesupporting

confidence: 64%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Initial and Final Setting Timesupporting

confidence: 64%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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“…Furthermore, it was shown by Horst et al [ 30 ] that P. aeruginosa can dissolute agglomerated TiO 2 nanoparticles through adsorption on the cell surface. It was shown that microorganisms can interact with these substances and possibly absorb the nanoparticles, which we have previously observed on a Streptomyces model [ 25 ].…”

Section: Discussionmentioning

confidence: 88%

“…A similar effect was observed in previous studies on Escherichia coli [ 15 ] and Streptomyces sp. [ 25 ]. In the second case, the EDX analysis on TEM revealed a signal coming from titanium inside pseudomycelium , in regions containing deposits of polyphosphate.…”

Section: Discussionmentioning

confidence: 99%

“…While many studies regarding nanomaterials are focused on the whole bacterial consortia, one should note that this approach may not offer answers on the specific interactions which can lead to discoveries concerning the biotechnological use of microorganisms stimulated by nanomaterials [ 22 , 23 ]. Although understanding the reactions of the whole microbial community is advantageous and helpful in predictive investigations, knowledge about specific reactions may provide data that allow the control of phenomena observed during the interaction between nanostructures and bacteria or fungi, enabling them to be used with certain advantages (e.g., biotechnological purposes) [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

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The Response of Pseudomonas aeruginosa PAO1 to UV-activated Titanium Dioxide/Silica Nanotubes

Augustyniak

Cendrowski

Grygorcewicz

et al. 2020

IJMS

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Pseudomonas aeruginosa is a bacterium of high clinical and biotechnological importance thanks to its high adaptability to environmental conditions. The increasing incidence of antibiotic-resistant strains has created a need for alternative methods to increase the chance of recovery in infected patients. Various nanomaterials have the potential to be used for this purpose. Therefore, we aimed to study the physiological response of P. aeruginosa PAO1 to titanium dioxide/silica nanotubes. The results suggest that UV light-irradiated nanomaterial triggers strong agglomeration in the studied bacteria that was confirmed by microscopy, spectrophotometry, and flow cytometry. The effect was diminished when the nanomaterial was applied without initial irradiation, with UV light indicating that the creation of reactive oxygen species could play a role in this phenomenon. The nanocomposite also affected biofilm formation ability. Even though the biomass of biofilms was comparable, the viability of cells in biofilms was upregulated in 48-hour biofilms. Furthermore, from six selected genes, the mexA coding efflux pump was upregulated, which could be associated with an interaction with TiO2. The results show that titanium dioxide/silica nanotubes may alter the physiological and metabolic functions of P. aeruginosa PAO1.

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“…Our results have shown that depending on the admixture, it was possible to pose more antimicrobial effect or rather stimulative. Recently, there is more and more data showing that stressors (such as nanomaterials) can stimulate certain microorganisms and up-regulate their metabolism (Maurer-Jones et al 2013;Augustyniak et al 2016;Lemire et al 2017). Thus, changing admixtures could modify the selective pressure on microorganisms that may be beneficial for the composite (Sarjit et al 2015).…”

Section: Gained Results In Scope Of Applied Microbiology and Construcmentioning

confidence: 99%

The effects of calcium–silicate–hydrate (C–S–H) seeds on reference microorganisms

et al. 2020

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Building materials are constantly improved with various additives and admixtures in order to achieve goals ranging from obtaining increased durability or antimicrobial activity up to reducing the carbon footprint left by the cement production. Since nanomaterials were proposed for cement products, many studies explored the possibilities for their incorporation. One of the novel trends in studying these materials is evaluating their impact on living organisms, with the focus not only on toxicology but also on the application potential. Therefore, in this study, we investigated the effects of three types of calciumsilicate-hydrate (C-S-H) seeds on reference microorganisms in the scope of their basic physiology and primary metabolism. Shape, size and elemental composition of C-S-H seeds were also evaluated. The tests on the reference microorganisms have shown that the reaction to these nanomaterials can be specific and depends on the strain as well as the type of used nanomaterial. Furthermore, the presence of C-S-H seeds in the growth environment led to metabolic stimulation that resulted in faster growth, higher biochemical activity, and increased biofilm formation. Based on our findings, we conclude that even though C-S-H seeds have antimicrobial potential, they can be potentially used to promote the growth of selected microbial strains. This phenomenon could be further investigated towards the formation of beneficial biofilms on building materials.

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Investigating the Interaction Between Streptomyces sp. and Titania/Silica Nanospheres

Cited by 17 publications

References 36 publications

The effects of seawater and nanosilica on the performance of blended cements and composites

The effects of seawater and nanosilica on the performance of blended cements and composites

The Response of Pseudomonas aeruginosa PAO1 to UV-activated Titanium Dioxide/Silica Nanotubes

The effects of calcium–silicate–hydrate (C–S–H) seeds on reference microorganisms

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