scholarly journals Aspergillus niger Decreases Bioavailability of Arsenic(V) via Biotransformation of Manganese Oxide into Biogenic Oxalate Minerals

2020 ◽  
Vol 6 (4) ◽  
pp. 270
Author(s):  
Bence Farkas ◽  
Marek Kolenčík ◽  
Miroslav Hain ◽  
Edmund Dobročka ◽  
Gabriela Kratošová ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Manganese Oxide ◽  
Manganese Oxides ◽  
Culture Medium ◽  
Arsenic Content ◽  
Manganese Ions ◽  
Potentially Toxic Metals ◽  
Ability To Act ◽  
Static Cultivation ◽  
The Stability

The aim of this work was to evaluate the transformation of manganese oxide (hausmannite) by microscopic filamentous fungus Aspergillus niger and the effects of the transformation on mobility and bioavailability of arsenic. Our results showed that the A. niger strain CBS 140837 greatly affected the stability of hausmannite and induced its transformation into biogenic crystals of manganese oxalates—falottaite and lindbergite. The transformation was enabled by fungal acidolysis of hausmannite and subsequent release of manganese ions into the culture medium. While almost 45% of manganese was bioextracted, the arsenic content in manganese precipitates increased throughout the 25-day static cultivation of fungus. This significantly decreased the bioavailability of arsenic for the fungus. These results highlight the unique A. niger strain’s ability to act as an active geochemical factor via its ability to acidify its environment and to induce formation of biogenic minerals. This affects not only the manganese speciation, but also bioaccumulation of potentially toxic metals and metalloids associated with manganese oxides, including arsenic.

scholarly journals Bioleaching of Manganese Oxides at Different Oxidation States by Filamentous Fungus Aspergillus niger

2021 ◽  
Vol 7 (10) ◽  
pp. 808
Author(s):  
Bence Farkas ◽  
Marek Bujdoš ◽  
Filip Polák ◽  
Michaela Matulová ◽  
Martin Cesnek ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Filamentous Fungus ◽  
Manganese Oxides ◽  
Culture Medium ◽  
Soil Fungi ◽  
Alternative Pathway ◽  
Manganese Content ◽  
Oxidation States ◽  
Reductive Dissolution ◽  
The Stability

This work aimed to examine the bioleaching of manganese oxides at various oxidation states (MnO, MnO·Mn2O3, Mn2O3 and MnO2) by a strain of the filamentous fungus Aspergillus niger, a frequent soil representative. Our results showed that the fungus effectively disintegrated the crystal structure of selected mineral manganese phases. Thereby, during a 31-day static incubation of oxides in the presence of fungus, manganese was bioextracted into the culture medium and, in some cases, transformed into a new biogenic mineral. The latter resulted from the precipitation of extracted manganese with biogenic oxalate. The Mn(II,III)-oxide was the most susceptible to fungal biodeterioration, and up to 26% of the manganese content in oxide was extracted by the fungus into the medium. The detected variabilities in biogenic oxalate and gluconate accumulation in the medium are also discussed regarding the fungal sensitivity to manganese. These suggest an alternative pathway of manganese oxides’ biodeterioration via a reductive dissolution. There, the oxalate metabolites are consumed as the reductive agents. Our results highlight the significance of fungal activity in manganese mobilization and transformation. The soil fungi should be considered an important geoactive agent that affects the stability of natural geochemical barriers.

scholarly journals Light-driven formation of manganese oxide by today’s photosystem II supports evolutionarily ancient manganese-oxidizing photosynthesis

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Petko Chernev ◽  
Sophie Fischer ◽  
Jutta Hoffmann ◽  
Nicholas Oliver ◽  
Ricardo Assunção ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Manganese Oxide ◽  
Water Oxidation ◽  
Manganese Oxides ◽  
Early Stage ◽  
Oxygenic Photosynthesis ◽  
Oxide Nanoparticles ◽  
Manganese Ions ◽  
Oxide Particles ◽  
Photosynthetic Water Oxidation

AbstractWater oxidation and concomitant dioxygen formation by the manganese-calcium cluster of oxygenic photosynthesis has shaped the biosphere, atmosphere, and geosphere. It has been hypothesized that at an early stage of evolution, before photosynthetic water oxidation became prominent, light-driven formation of manganese oxides from dissolved Mn(2+) ions may have played a key role in bioenergetics and possibly facilitated early geological manganese deposits. Here we report the biochemical evidence for the ability of photosystems to form extended manganese oxide particles. The photochemical redox processes in spinach photosystem-II particles devoid of the manganese-calcium cluster are tracked by visible-light and X-ray spectroscopy. Oxidation of dissolved manganese ions results in high-valent Mn(III,IV)-oxide nanoparticles of the birnessite type bound to photosystem II, with 50-100 manganese ions per photosystem. Having shown that even today’s photosystem II can form birnessite-type oxide particles efficiently, we propose an evolutionary scenario, which involves manganese-oxide production by ancestral photosystems, later followed by down-sizing of protein-bound manganese-oxide nanoparticles to finally yield today’s catalyst of photosynthetic water oxidation.

scholarly journals Characterization and optimization of extracellular enzymes production by Aspergillus niger strains isolated from date by-products

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Reda Bellaouchi ◽  
Houssam Abouloifa ◽  
Yahya Rokni ◽  
Amina Hasnaoui ◽  
Nabil Ghabbour ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Culture Medium ◽  
Extracellular Enzymes ◽  
Enzyme Expression ◽  
Specific Enzyme ◽  
Enzymatic Production ◽  
High Production Rate ◽  
High Production ◽  
Incubation Temperatures ◽  
By Products

Abstract Background This work aims to study the optimal conditions of the fermentation culture medium used for the production of extracellular enzymes (amylase, cellulase, lipase, and protease) from previously isolated Aspergillus niger strains in date by-products. Results The five most powerful isolates selected based on the zone of degradation formed on Petri plates by the substrate were subjected to the quantitative evaluation of their enzymatic production. All five strains showed almost similar API-ZYM profiles, with minor variations observed at the level of some specific enzyme expression. The production of cellulase and amylase was depending on pH and incubation temperatures. ASP2 strain demonstrated the high production rate of amylase (at pH 5 and 30 °C) and cellulase (at pH 6 and 30 °C) for 96 h of incubation. Conclusion The A. niger showed the ability to produce several extracellular enzymes and can be used in the valorization of different agroindustrial residues.

Electrochemical lithium recovery with lithium iron phosphate: What causes performance degradation and how can we improve the stability?

2021 ◽  
Author(s):  
Lei Wang ◽  
Kathleen C Frisella ◽  
Pattarachai Srimuk ◽  
Oliver Janka ◽  
Guido Kickelbick ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Manganese Oxide ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
High Energy ◽  
Performance Degradation ◽  
Electrochemical Processes ◽  
High Energy Efficiency ◽  
The Stability

Electrochemical processes enable fast lithium extraction, for example, from brines, with high energy efficiency and stability. Lithium iron phosphate (LiFePO4) and manganese oxide (λ-MnO2) have usually been employed as the...

Photoelectrochemical OER activity by employing BiVO4 with manganese oxide co-catalysts

2020 ◽  
Vol 22 (2) ◽  
pp. 811-817 ◽  
Author(s):  
Manjodh Kaur ◽  
Manjeet Chhetri ◽  
C. N. R. Rao
Keyword(s):  
Manganese Oxide ◽  
Water Splitting ◽  
Manganese Oxides ◽  
Photoelectrochemical Water Splitting ◽  
Co Catalysts ◽  
Natural Photosynthesis

Inspired by natural photosynthesis, various manganese oxides have been studied as co-catalysts with BiVO4 for photoelectrochemical water splitting.

scholarly journals Gold Bioleaching from Printed Circuit Boards of Mobile Phones by Aspergillus niger in a Culture without Agitation and with Glucose as a Carbon Source

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 521 ◽  
Author(s):  
Rosalba Argumedo-Delira ◽  
Mario J. Gómez-Martínez ◽  
Brenda Joan Soto
Keyword(s):  
Aspergillus Niger ◽  
Carbon Source ◽  
Culture Medium ◽  
Printed Circuit Boards ◽  
Biological Processes ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Material Resources ◽  
Low Energy Consumption ◽  
Fungal Consortium

Hydrometallurgical and pyrometallurgical processes to recover gold (Au) from cell-phone printed circuit boards (PCBs) have the disadvantage of generating corrosive residues and consuming a large amount of energy. Therefore, it is necessary to look for biological processes that have low energy consumption and are friendly to the environment. Among the biological alternatives for the recovery of Au from PCB is the use of cyanogenic bacteria and filamentous fungi in cultures with agitation. Considering that it is important to explore the response of microorganisms in cultures without agitation to reduce energy expenditure in the recovery of metals from PCB, the present investigation evaluated the capacity of Aspergillus niger MXPE6 and a fungal consortium to induce Au bioleaching from PCB in a culture medium with glucose as a carbon source and without agitation (pH 4.5). The results indicate that the treatments with PCB inoculated with the fungal consortium showed a considerable decrease in pH (2.8) in comparison with the treatments inoculated with A. niger MXPE6 (4.0). The fungal consortium showed a significantly higher Au bioleaching (56%) than A. niger MXPE6 (17%). Finally, the use of fungal consortia grown without agitation could be an alternative to recover metals from PCB, saving energy and material resources.

scholarly journals Colonization, penetration and transformation of manganese oxide nodules by Aspergillus niger

2019 ◽  
Vol 21 (5) ◽  
pp. 1821-1832 ◽  
Author(s):  
John Ferrier ◽  
Yuyi Yang ◽  
Laszlo Csetenyi ◽  
Geoffrey Michael Gadd
Keyword(s):  
Aspergillus Niger ◽  
Manganese Oxide
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