The assessment of copper, iron, zinc, and nickel tolerance combined with nostoc linckia biomass production
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2023-08-21 21:39
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582.232:577.150.4 (1)
Botanică sistematică (850)
Bazele materiale ale vieții. Biochimie. Biologie moleculară. Biofizică (657)
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CODREANU, Liviu. The assessment of copper, iron, zinc, and nickel tolerance combined with nostoc linckia biomass production. In: Biotehnologii moderne - soluții pentru provocările lumii contemporane, 20-21 mai 2021, Chişinău. Chișinău, Republica Moldova: Tipografia "Artpoligraf", 2021, p. 51. ISBN 978-9975-3498-7-1. DOI: https://doi.org/10.52757/imb21.017
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Biotehnologii moderne - soluții pentru provocările lumii contemporane 2021
Simpozionul "Simpozion ştiinţific naţional cu participare internaţională: "
Chişinău, Moldova, 20-21 mai 2021

The assessment of copper, iron, zinc, and nickel tolerance combined with nostoc linckia biomass production

DOI: https://doi.org/10.52757/imb21.017
CZU: 582.232:577.150.4

Pag. 51-51

Codreanu Liviu
 
Institute of Microbiology and Biotechnology
 
Disponibil în IBN: 10 iunie 2021


Rezumat

Nowadays, heavy metals constitute some of the most significant environmental contaminants. Metal pollution has harmful effect on biological systems and does not undergo biodegradation. Though physical and chemical treatment strategies to remove metal pollutants exist, such methods are labor intensive. Moreover, chemical treatment methods are expensive and sometimes ineffective, especially when metals are present in solution at very low concentrations. An emerging field of interest is the use of biological agents that are cheap, safer, and possess the natural ability to uptake heavy metals for the remediation of the environment. Many types of biomass show effective binding of toxic heavy metals from industrial and environmental effluents. The microorganism can be involved in heavy metal uptake by employing two processes: intracellular accumulation through its living biomass, and extracellular binding through both living and dead biomass. Metal toxicity towards organisms is determined by the growth inhibition. Nostoc linckia is a filamentous cyanobacterium whose cells are covered by a gelatinous matrix, consisting primarily of polysaccharides, cross-linked with structural proteins. Cell wall polysaccharides play a crucial role in heavy metal binding and accumulation processes. The living biomass cell wall has many functional groups, such as hydroxyl (OH), phosphoryl (PO3O2), amino (NH2), carboxyl (COOH), sulphydryl (SH), etc., which confer negative charge to the cell surface. Since metal ions in water are generally in the cationic form, they are adsorbed onto the cell surface. In this study, we assessed Nostoc linckia tolerance to grow in various metal systems in terms of biomass production. Nostoc growth in four copper metal systems (CuFe, CuFeNi, CuFeZn, and CuFeNiZn) was spectrophotometrically determined at the end of cultivation cycle, which lasted 12 days (Fig. 1). Metals were added to the culture medium in the form of the following salts CuSO4∙5H2O, FeCl3∙6H2O, Ni(NO3)2∙6H2O, ZnCl2, in which metal concentration was 2.5 mg/L copper, 1.25 mg/L iron, 0.5 mg/L nickel, and 0.5 mg/L zinc, respectively.figuraFig. 1. Nostoc linckia biomass accumulated during the cultivation in metal systems with copper ions. The data showed no significant decrease in the amount of biomass in the case of Nostoc growth in metal systems with copper ions. In all systems, cyanobacterial biomass produced during cultivation cycle was about 0.75 mg/L, which means a reduction of up to 10% compared to control. Hence, cyanobacterium Nostoc linckia showed good growth tolerance in all variants of the experiment. Thus, Nostoc linckia is a suitable matrix for remediation processes that offers a vast competition ground for metal cations. Due to its biological nature, nostoc releases a variety of polysaccharides into the culture medium during cell growth. These structures enhance nostoc tolerance to overcome the toxicity of metals.