Exploration of Microbial Diversity of Himalaya Region for Gold Nanoparticles Synthesizing Bacteria

Thakur, Ravindra Singh; Shirkot, Poonam; Verma, Ashwani Kumar

doi:10.20546/ijcmas.2017.608.259

Cited by 4 publications

(2 citation statements)

References 39 publications

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“…In 2015 and 2016, Delijou et al (22) and Sarangadharan et al (23), respectively, synthesized silver nanoparticles, Shivashankarappa (24) synthesized Cds nanoparticle while Thakur et al (25) synthesized gold nanoparticles through the use of B. licheniformis in 7–31, 3–170, 20–40, and 45 nm particle sizes, respectively. This study showed the ability of B.licheniformis to synthesize Bi 2 O 3 NPs in the range of 29–62 nm size.…”

Section: Discussionmentioning

confidence: 99%

Inhibitory Effect of Bismuth Oxide Nanoparticles Produced by Bacillus licheniformis on Methicillin-Resistant Staphylococcus aureus Strains (MRSA)

et al. 2018

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Background Based on the increase in antibiotic-resistant pathogens, it is necessary to have various effective compounds, so as to prevent its proliferation of these pathogens. For this purpose, nano-materials such as bismuth oxide nanoparticles can be used. Objectives The aim of this study was to produce bismuth oxide nanoparticles by Bacillus licheniformis PTCC1320 and to determine the antimicrobial effects on methicillin-resistant Staphylococcus aureus species compared with some antibiotics. Materials and Methods In this study, 200 bacterial samples were collected from hospitalized patients with burn infections from the Burn Rescue Hospital, Tehran. Thereafter, 65 strains of methicillin-resistant Staphylococcus aureus were identified by their phenotype and genotype. A total of 92% of identified strains with the highest resistance to antibiotics were isolated. Bismuth oxide nanoparticles were synthesized by Bacillus licheniformis PTCC1320. FTIR spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM) were used to analyze the extracellularly produced nanoparticles. Finally, the antibacterial properties of nanoparticles produced on the biofilm of some pathogens were examined. Results In the present study, cube-shaped bismuth oxide nanoparticles were formed in the size range of 29–62 nm. They were found to have antimicrobial activity on 16% of the isolated Staphylococcus aureus strains. The FTIR results showed the vibrational frequencies of bismuth oxide at 583, 680, 737, and 1630 nm. The XRD results also confirmed the structure of nanoparticles. Compared with antibiotics such as Ciprofloxacin, bismuth oxide nanoparticles had less affectivity on this resistant hospital pathogen. Increasing the concentration of bismuth oxide nanoparticles, increased its antimicrobial effect and decreased bacterial growth rate. Conclusion Compared with heavy metals, bismuth nanoparticles have very low antibacterial effects. Considering this feature, the use of less antibiotics can be achieved with bismuth nanoparticles in the treatment of infections, thereby reducing antibiotic resistance.

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Section: Discussionmentioning

confidence: 99%

Inhibitory Effect of Bismuth Oxide Nanoparticles Produced by Bacillus licheniformis on Methicillin-Resistant Staphylococcus aureus Strains (MRSA)

et al. 2018

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“…The aqueous suspensions were synthesized using the methods of Turkevich et al (1951) and Liu et al (2003) with modified synthesis conditions and two-stage microwave-convection heating. For this purpose, aqueous mixtures of 3.5 mM sodium citrate with 7.0 mM tetrachloroauric acid (HAuCl4), 7.0 mM silver nitrate (AgNO3) and 7.0 mM potassium tetrachloroplatinate II (K2PtCl4), respectively, were prepared.…”

Section: Colloids Preparationmentioning

confidence: 99%

Effects of Silver, Gold, and Platinum Nanoparticles on Selected Nematode Trophic Groups

Dzięgielewska,

Skwiercz,

Wesołowska

et al. 2023

Journal of Horticultural Research

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As trophic organisms, nematodes play an essential role in the soil environment: they mineralize nutrients into plant-available forms, are a food source for other soil organisms, and feed on pathogenic organisms and plant pests, therefore regulating populations of soil microorganisms. The plant-parasitic nematodes are important pests of crops. Nanoparticles (NP) are increasingly used in agriculture and other production sectors. They are present in the soil, not necessarily in trace amounts, and can affect various soil organisms, including nematodes. In this article, the effects of silver (Ag), gold (Au), and platinum (Pt) nanoparticles on the mortality and reproduction activity of selected nematode species from two trophic groups: entomopathogenic nematodes (EPN) (Heterorhabditis bacteriophora and Steinernema feltiae) and plant parasitic nematodes (PPN) (Xiphinema diversicaudatum, Ditylenchus dipsaci, Heterodera schachtii) were studied under laboratory conditions. All nanoparticles decreased the nematode population to an extent depending on the nematode species, nanoparticle type, and exposure time. AgNP had the greatest nematicidal effect, except for AuNP, which reduced the population of H. schachtii the most. The greatest sensitivity to AgNP was observed in X. diversicaudatum (100% mortality), D. dipsaci (90% mortality), and 37 to 13% mortality in other species. Effect of AuNP and PtNP on entomopathogenic nematodes was comparable to the control, not treated with nanoparticles. AuNP and PtNP similarly influenced nematode mortality. However, the effect of nanoparticles on new generations of entomopathogenic nematodes developing in host larvae Galleria melonella was inconclusive. All nanoparticles decreased the number of larvae of S. felitae and increased the number of H. bacteriophora migrating outside the cadavers compared to the control.

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Synthesis of gold nanoparticles and assessment of in vitro toxicity against plant pathogens

Thakur

Prasad

2021

Indian Phytopathology

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Exploration of Microbial Diversity of Himalaya Region for Gold Nanoparticles Synthesizing Bacteria

Cited by 4 publications

References 39 publications

Inhibitory Effect of Bismuth Oxide Nanoparticles Produced by Bacillus licheniformis on Methicillin-Resistant Staphylococcus aureus Strains (MRSA)

Inhibitory Effect of Bismuth Oxide Nanoparticles Produced by Bacillus licheniformis on Methicillin-Resistant Staphylococcus aureus Strains (MRSA)

Effects of Silver, Gold, and Platinum Nanoparticles on Selected Nematode Trophic Groups

Synthesis of gold nanoparticles and assessment of in vitro toxicity against plant pathogens

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