Immobilization of Nickel by Bacterial Isolates from the Indian Ridge System and the Chemical Nature of the Accumulated Metal

Sujith, P. P.; Khedekar, V. D.; Girish, A. P.; Bharathi, P. A. Loka

doi:10.1080/01490450903480285

Cited by 10 publications

(4 citation statements)

References 30 publications

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“…However, the yield of cultured Ni-tolerant bacteria might correlate with the yield of Co-tolerant bacteria (r = 0.606, p < 0.05), suggesting that the same microbial communities are capable of immobilising both metals. These results agree with our recent reports [4,56] on Ni and Co immobilisation by Mnoxidising bacterial isolates from the Indian Ridge system. TBC correlated positively (r = 0.868, p < 0.001) and TOC negatively with depth (r = 0.666, p < 0.05).…”

Section: Biotic Immobilisationsupporting

confidence: 95%

“…Immobilisation may be through cellular sequestration and accumulation, or through extracellular precipitation [4,5]. Marine bacteria produce large amounts of organic surface material that interacts with metal ions.…”

Section: Introductionmentioning

confidence: 99%

“….0 ± 0.18 × 10 4 6.8 ± 0.70 × 10 4 1.6 ± 0.02 × 10 5 2.6 ± 0.23 × 10 5 1.8 ± 0.10 × 10 5 1.9 ± 0.13 × 10 54 1 .0 ± 0.11 × 10 5 6.1 ± 0.06 × 10 4 2.4 ± 0.31 × 10 5 1.7 ± 0.07 × 10 5 3.9 ± 0.02 × 10 5 2.2 ± 0.18 ×10 5 6 8 .8 ± 0.09 × 10 4 5.4 ± 0.42 × 10 4 9.1 ± 0.46 × 10 4 1.3 ± 0.35 × 10 5 3.3 ± 0.21 × 10 5 1.6 ± 0.09 × 10 5 8 2 .4 ± 0.37 × 10 5 3.5 ± 0.51 × 10 4 2.1 ± 0.10 × 10 5 1.5 ± 0.16 × 10 5 2.4 ± 0.03 × 10 5 6.8 ± 0.42 × 10 4 10 1.6 ± 0.24 × 10 5 5.0 ± 0.02 × 10 4 1.6 ± 0.05 × 10 5 2.8 ± 0.04 × 10 5 1.3 ± 0.09 × 10 5 5.0 ± 0.02 × 10 4 15 1.2 ± 0.08 × 10 5 1.2 ± 0.07 × 10 4 3.9 ± 0.06 × 10 4 1.4 ± 0.05 × 10 5 1.2 ± 0.24 × 10 5 6.2 ± 0.18 × 10 4 20 1.4 ± 0.15 × 10 5 7.1 ± 0.15 × 10 4 5.1 ± 0.31 × 10 4 6.6 ± 0.02 × 10 4 1.7 ± 0.11 × 10 5 1.6 ± 0.31 × 10 5 25 1.6 ± 0.26 × 10 5 2.5 ± 0.11 × 10 4 4.2 ± 0.17 × 10 4 2.0 ± 0.10 × 10 4 1.7 ± 0.07 × 10 5 7.9 ± 0.01 × 10 4 302.0 ± 0.24 × 10 5 3.1 ± 0.32 × 10 4 9.9 ± 0.06 × 10 4 1.0 ± 0.08 × 10 5 2.2 ± 0.05 × 10 5 1.5 ± 0.11 × 10 5 351.7 ± 0.09 × 10 5 3.0 ± 0.13 × 10 4 9.5 ± 0.22 × 10 4 4.8 ± 0.15 × 10 4 2.4 ± 0.21 × 10 5 7.2 ± 0.45 × 10 4Note: All the values in the table represent colony forming units (cfu)·g −1 dry weight of sediment. The data are given as mean ± SD, n = 3.…”

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confidence: 98%

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Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities

Sujith

Das

Mourya

et al. 2011

Chemistry and Ecology

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Box core samples BC26 and BC36 from geologically different settings were examined to test the hypothesis that autochthonous microbial communities from polymetallic-nodule-rich Central Indian Basin sediments actively participate in immobilising metal ions. The bottom water dissolved oxygen concentration was reported to be 4.2-4.3 mL·L −1 in the northern siliceous ooze (BC26) and 4.1-4.2 mL·L −1 in the southern pelagic red clay (BC36); the sedimentation rates for these regions were 0.834 and 0.041 cm·kyr −1 , respectively. An onboard experiment, conducted under oxic and sub-oxic conditions with 100 μmol of Mn, Co and Ni, showed that microbial immobilisation under sub-oxic conditions was higher than in azide-treated controls in BC26 for Mn, Co and Ni at 30, 2 and 4 cm below sea floor (bsf), respectively, after 45 days. The trend in immobilisation was BC26 > BC36, Co > Mn > Ni under oxic conditions and Mn > Co > Ni under sub-oxic conditions. The depth of maximum immobilisation for Co in BC26 under sub-oxic conditions coincided with the yield of cultured Co-tolerant bacteria and Ni only with organic carbon at 4 cm bsf. This study demonstrates that the organic carbon content and bioavailable metal concentrations in sediments regulate microbial participation in metal immobilisation.

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Section: Biotic Immobilisationsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

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Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities

Sujith

Das

Mourya

et al. 2011

Chemistry and Ecology

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“…Bacteria on the NDGP surface also formed large aggregates, whereas the bacteria on the GP surface remained dispersed. This effect may have been due to the bacteria’s attempt to minimize exposure to the NDGP surface, hence reducing cell death. , When S. aureus was treated for 24 h with amoxicillin (150 μg/mL) or ND (10 mg/mL) alone, bacterial death was also observed, showing that S. aureus responds to both amoxicillin and ND treatment (Figure B, rows 3 and 4). Taken together, these results suggest that drug functionality was preserved during NDGP synthesis and that NDGP prevents bacterial contamination through a contact-mediated inhibition mechanism.…”

Section: Resultsmentioning

confidence: 98%

Nanodiamond–Gutta Percha Composite Biomaterials for Root Canal Therapy

Lee¹,

Kim²,

Limansubroto³

et al. 2015

ACS Nano

135

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Root canal therapy (RCT) represents a standard of treatment that addresses infected pulp tissue in teeth and protects against future infection. RCT involves removing dental pulp comprising blood vessels and nerve tissue, decontaminating residually infected tissue through biomechanical instrumentation, and root canal obturation using a filler material to replace the space that was previously composed of dental pulp. Gutta percha (GP) is typically used as the filler material, as it is malleable, inert, and biocompatible. While filling the root canal space with GP is the standard of care for endodontic therapies, it has exhibited limitations including leakage, root canal reinfection, and poor mechanical properties. To address these challenges, clinicians have explored the use of alternative root filling materials other than GP. Among the classes of materials that are being explored as novel endodontic therapy platforms, nanodiamonds (NDs) may offer unique advantages due to their favorable properties, particularly for dental applications. These include versatile faceted surface chemistry, biocompatibility, and their role in improving mechanical properties, among others. This study developed a ND-embedded GP (NDGP) that was functionalized with amoxicillin, a broad-spectrum antibiotic commonly used for endodontic infection. Comprehensive materials characterization confirmed improved mechanical properties of NDGP over unmodified GP. In addition, digital radiography and microcomputed tomography imaging demonstrated that obturation of root canals with NDGP could be achieved using clinically relevant techniques. Furthermore, bacterial growth inhibition assays confirmed drug functionality of NDGP functionalized with amoxicillin. This study demonstrates a promising path toward NDGP implementation in future endodontic therapy for improved treatment outcomes.

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Manganese Oxidation by Bacteria: Biogeochemical Aspects

Sujith

Bharathi

2011

Molecular Biomineralization

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Manganese is an essential trace metal that is not as readily oxidizable like iron. Several bacterial groups posses the ability to oxidize Mn effectively competing with chemical oxidation. The oxides of Mn are the strongest of the oxidants, next to oxygen in the aquatic environment and therefore control the fate of several elements. Mn oxidizing bacteria have a suit of enzymes that not only help to scavenge Mn but also other associated elements, thus playing a crucial role in biogeochemical cycles. This article reviews the importance of manganese and its interaction with microorganisms in the oxidative Mn cycle in aquatic realms.

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Immobilization of Nickel by Bacterial Isolates from the Indian Ridge System and the Chemical Nature of the Accumulated Metal

Cited by 10 publications

References 30 publications

Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities

Immobilisation of manganese, cobalt and nickel by deep-sea-sediment microbial communities

Nanodiamond–Gutta Percha Composite Biomaterials for Root Canal Therapy

Manganese Oxidation by Bacteria: Biogeochemical Aspects

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