Extracellular polymeric substances in Antarctic environments: A review of their ecological roles and impact on glacier biogeochemical cycles

Nagar, Shipra; Antony, Runa; Thamban, Meloth

doi:10.1016/j.polar.2021.100686

Cited by 33 publications

(16 citation statements)

References 176 publications

(216 reference statements)

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“…The activity of EPS to activate macrophages (Zhang et al, 2018) and improve cell viabilities (Yu et al, 2016) supports the role EPS's can play in biomedical fields. Indeed, the role of EPSs from Antarctica isolates on the biogeochemical cycling of calcium and iron in the marine environment, aiding the production and sequestration of dissolved and particulate organic material, aggregation of dust particulates on the surface of the glaciers, and as an essential source of carbon for microorganisms in the food chain have also been recently documented (Bhaskar and Bhosle, 2005;Nagar et al, 2021).…”

Section: Biotechnological Advantages Of Extremophilic Eps Over Traditional Biopolymersmentioning

confidence: 99%

Extremophilic Exopolysaccharides: Biotechnologies and Wastewater Remediation

et al. 2021

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Various microorganisms thrive under extreme environments, like hot springs, hydrothermal vents, deep marine ecosystems, hyperacid lakes, acid mine drainage, high UV exposure, and more. To survive against the deleterious effect of these extreme circumstances, they form a network of biofilm where exopolysaccharides (EPSs) comprise a substantial part. The EPSs are often polyanionic due to different functional groups in their structural backbone, including uronic acids, sulfated units, and phosphate groups. Altogether, these chemical groups provide EPSs with a negative charge allowing them to (a) act as ligands toward dissolved cations as well as trace, and toxic metals; (b) be tolerant to the presence of salts, surfactants, and alpha-hydroxyl acids; and (c) interface the solubilization of hydrocarbons. Owing to their unique structural and functional characteristics, EPSs are anticipated to be utilized industrially to remediation of metals, crude oil, and hydrocarbons from contaminated wastewaters, mines, and oil spills. The biotechnological advantages of extremophilic EPSs are more diverse than traditional biopolymers. The present review aims at discussing the mechanisms and strategies for using EPSs from extremophiles in industries and environment bioremediation. Additionally, the potential of EPSs as fascinating biomaterials to mediate biogenic nanoparticles synthesis and treat multicomponent water contaminants is discussed.

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Section: Biotechnological Advantages Of Extremophilic Eps Over Traditional Biopolymersmentioning

confidence: 99%

Extremophilic Exopolysaccharides: Biotechnologies and Wastewater Remediation

et al. 2021

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“…The EPS enables biosorption of trace minerals and sequestration of organic matter and nutrients. 13 , 14 The distinct physical structure of EPS acts as a buffer for microbes in the interior of aggregates to modulate against environmental change and resist adverse environmental effects. 13 , 15 , 16 This buffering and resistance capacity of EPS raises the questions whether the current conjectures of microbial distribution also apply to the methanotrophs and methanogens at soil-water interface, and whether and to what extent the abundance and diversity of these microbes are driven by the environmental factors, such as temperature, soil organic carbon (SOC), soil total nitrogen (STN), metal ions and pH.…”

Section: Introductionmentioning

confidence: 99%

“… 13 , 14 The distinct physical structure of EPS acts as a buffer for microbes in the interior of aggregates to modulate against environmental change and resist adverse environmental effects. 13 , 15 , 16 This buffering and resistance capacity of EPS raises the questions whether the current conjectures of microbial distribution also apply to the methanotrophs and methanogens at soil-water interface, and whether and to what extent the abundance and diversity of these microbes are driven by the environmental factors, such as temperature, soil organic carbon (SOC), soil total nitrogen (STN), metal ions and pH. Furthermore, microbes in PB mostly originate from the underlying soil and constantly exchange and interact with soil microbes, 3 which leads to the question whether there is any association between CH 4 -related microbes in soil and at soil-water interface.…”

Section: Introductionmentioning

confidence: 99%

Distribution of methanogenic and methanotrophic consortia at soil-water interfaces in rice paddies across climate zones

et al. 2023

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“…It is reasonable to assume that Antarctic EPSs played a significant role in protecting organisms within ice floes from ice-crystal damage, buffering against pH and salinity fluctuations, and alleviating other chemical stresses such heavy metals though the mechanism was not so evident. It has been found that the molecular weight of EPSs produced by sea-ice isolates is 5-50 times higher than the average of other isolated marine EPSs [10][11][12]. Due to their appealing structure and physicochemical properties, EPSs generated by sea-ice isolates may be useful biosorbents for the removal of heavy metals from saltwater [13].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of the Adsorption of Lead(II) onto an Antarctic Sea-Ice Bacterial Exopolysaccharide

Adamu

Marbawi

Othman

et al. 2022

J Environ Bioremed Toxicol

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Hypertension and kidney impairment are two of the many adult health problems that have been related to lead exposure. Women who are expecting a child are especially susceptible to the dangers of lead since it can have devastating consequences on the developing embryo. Existing techniques for the remediation of lead pollutant include membrane separation, ion exchange, precipitation and biosorption. Of all of this technology, biosorption has several positive aspects which include low operating expenses, very efficient detoxification of toxicants at low concentrations and low amount of disposal materials. The biosorption of the biosorption of lead(II) onto an Antarctic sea-ice bacterial exopolysaccharide is remodeled using nonlinear regression and the optimal mode was determined by a series of error function assessments. Statistical analysis showed that the best kinetic model for adsorption in salt-free water was pseudo-1st order while the best kinetic model for adsorption in seawater was pseudo-2nd order model. All error function analyses also supported these two best models. The kinetic constants values for salt-free water and seawater shows large difference in terms of adsorption in salt-free water and seawater. A higher equilibrium biosorption capacity for lead (II) or qe values were exhibited for both k1 and k2 rate constants in sea water indicating a more efficient adsorption in seawater. Adsorption in seawater increased the qe values from 51.11 (mg/g) (95% confidence interval from 49.75 to 52.44) to 92.98 (mg/g) (95% C.I. from 91.01 to 94.95) In addition, the h value, (mg/g.min) indicates a stronger driving force to accelerate the diffusion of adsorbate from seawater onto the adsorbent. The results suggest fundamental difference of sorption mechanism and functional groups are involved in salt-free and seawater.

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Extracellular polymeric substances in Antarctic environments: A review of their ecological roles and impact on glacier biogeochemical cycles

Abstract: polymeric substances in antarctic environments: A review of their ecological roles and impact on glacier biogeochemical cycles,

Cited by 33 publications

References 176 publications

Extremophilic Exopolysaccharides: Biotechnologies and Wastewater Remediation

Extremophilic Exopolysaccharides: Biotechnologies and Wastewater Remediation

Distribution of methanogenic and methanotrophic consortia at soil-water interfaces in rice paddies across climate zones

Kinetic Analysis of the Adsorption of Lead(II) onto an Antarctic Sea-Ice Bacterial Exopolysaccharide

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