Bibliographies thématiques / Selenium nanoparticles bacillus mycoides

Littérature scientifique sur le sujet « Selenium nanoparticles bacillus mycoides »

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Publié le 11 mars 2023

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Articles de revues sur le sujet "Selenium nanoparticles bacillus mycoides"

Lampis, Silvia, Emanuele Zonaro, Cristina Bertolini, Paolo Bernardi, Clive S. Butler et Giovanni Vallini. « Delayed formation of zero-valent selenium nanoparticles by Bacillus mycoides SeITE01 as a consequence of selenite reduction under aerobic conditions ». Microbial Cell Factories 13, n^o 1 (2014) : 35. http://dx.doi.org/10.1186/1475-2859-13-35.

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Vallini, Giovanni, Simona Di Gregorio et Silvia Lampis. « Rhizosphere-induced Selenium Precipitation for Possible Applications in Phytoremediation of Se Polluted Effluents ». Zeitschrift für Naturforschung C 60, n^o 3-4 (1 avril 2005) : 349–56. http://dx.doi.org/10.1515/znc-2005-3-419.

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Abstract Two bacterial isolates were obtained in axenic culture from the rhizosphere soil of Astragalus bisulcatus, a legume able to hyperaccumulate selenium. Both strains resulted of particular interest for their high resistance to the toxic oxyanion SeO32- (selenite, SeIV). On the basis of molecular and biochemical analyses, these two isolates were attributed to the species Bacillus mycoides and Stenotrophomonas maltophilia, respectively. Their capability in axenic culture to precipitate the soluble, bioavailable and highly toxic selenium form selenite to insoluble and relatively non-toxic Se0 (elemental selenium) was evaluated in defined medium added with 0.2 or 0.5 mm SeIV. Both strains showed to completely reduce 0.2 mᴍ selenite in 120 h, while 0.5 mm SeIV was reduced up to 67% of the initial concentration by B. mycoides and to about 50% by S. maltophilia in 48 h. Together in a dual consortium, B. mycoides and S. maltophilia increased the kinetics of selenite reduction, thus improving the efficiency of the process. A model system for selenium rhizofiltration based on plant-rhizobacteria interactions has been proposed.

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Yurkevich, Natalia, Aleksey Makas, Svetlana Bortnikova, Alexander Reutsky, Valeriy Chernuhin, Natalya Abrosimova et Darya Cheshkina. « CHARACTERISTICS OF THE COMPOSITION OF THE SELENIUM-, NITROGEN - AND SULFUR-CONTAINING COMPOUNDS IN THE VAPOR PHASE FROM THE DUMP OF GOLD DEPOSITS ». Interexpo GEO-Siberia 2, n^o 3 (2019) : 209–17. http://dx.doi.org/10.33764/2618-981x-2019-2-3-209-217.

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The results of an experiment to determine the composition of selenium, nitrogen and sulfur-containing compounds in the vapor-gas phase above the surface of the autoclaved sample of the waste substance of the Ursk sulfide-containing gold mining waste (Kemerovo region) and with the addition of a cultured bacterium of the Bacillus mycoides species are presented.

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Tymoshok, N. O., M. S. Kharchuk, V. G. Kaplunenko, V. S. Bityutskyy, S. I. Tsekhmistrenko, O. S. Tsekhmistrenko, M. Y. Spivak et О. М. Melnichenko. « Evaluation of effects of selenium nanoparticles on Bacillus subtilis ». Regulatory Mechanisms in Biosystems 10, n^o 4 (7 novembre 2019) : 544–52. http://dx.doi.org/10.15421/021980.

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The present study was performed to characterize of selenium nanoparticles (Nano-Se) which were synthesized by pulsed laser ablation in liquids to obtain the aqueous selenium citrate solution. The study was conducted using bacteriological and electronic-microscopic methods. Transmission electron microscopy (TEM) and spectroscopy analyses demonstrated that nano-selenium particles obtained by the method of selenium ablation had the size of 4–8 nm. UV-Visible Spectrum colloidal solution Nano-Se exhibited absorption maxima at 210 nm. To clarify some effects of the action of Nano-Se on Bacillus subtilis, we investigated the interaction of Nano-Se with B. subtilis IMV B-7392 before and after incubation with Nano-Se, examining TEM images. It has been shown that exposure to B. subtilis IMV B-7392 in the presence of Nano-Se is accompanied by the rapid uptake of Nano-Se by bacterial culture. TEM analysis found that the electron-dense Nano-Se particles were located in the intracellular spaces of B. subtilis IMV B-7392. That does not lead to changes in cultural and morphological characteristics of B. subtilis IMV B-7392. Using TEM, it has been shown that penetration of nanoparticles in the internal compartments is accompanied with transient porosity of the cell membrane of B. subtilis IMV B-7392 without rupturing it. The effective concentration of Nano-Se 0.2 × 10–3 mg/mL was found to increase the yield of biologically active substances of B. subtilis. In order to create probiotic nano-selenium containing products, the nutrient medium of B. subtilis IMV B-7392 was enriched with Nano-Se at 0.2 × 10–3 mg/mL. It was found that particles Nano-Se are non-toxic to the culture and did not exhibit bactericidal or bacteriostatic effects. The experimentally demonstrated ability of B. subtilis to absorb selenium nanoparticles has opened up the possibility of using Nano-Se as suitable drug carriers.

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Al-Hagar, Ola E. A., Deyaa Abol-Fotouh, Eman S. Abdelkhalek, Mostafa M. Abo Elsoud et N. M. Sidkey. « Bacillus niabensis OAB2 : Outstanding bio-factory of selenium nanoparticles ». Materials Chemistry and Physics 273 (novembre 2021) : 125147. http://dx.doi.org/10.1016/j.matchemphys.2021.125147.

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Greeshma, B. C., et M. Mahesh. « Biosynthesis of selenium nanoparticles from Bacillus species and its applications ». Journal of Applied and Natural Science 11, n^o 4 (10 décembre 2019) : 810–15. http://dx.doi.org/10.31018/jans.v11i4.2188.

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Selenium nanoparticles have been widely used in the various areas especially in medical field for its anticancer and immune modulatory properties. To reduce the toxic chemicals released by chemical process, the present work was aimed at synthesis of selenium nanoparticles by microbes. In this study, microbes were isolated from soil samples from different areas of Bangalore and screened for the antioxidant activity by DPPH assay. The organism with highest antioxidant activity (IC50 value = 11.6µg/mL) was identified as Bacillus species. Under experimental conditions, this microbe along with sodium selenite synthesised selenium nanoparticle indicated by the colour change of the medium to reddish orange. The synthesised selenium nanoparticles were further characterised. From UV-Vis spectrophotometry, the maximum peak was obtained at 266.5nm. The FT-IR analysis showed peaks at different wavelengths with the maximum of 3200cm-1 showing the presence of alcoholic group. The shape and size of the selenium nanoparticles was also calibrated by SEM analysis as oval and 209nm-748nm respectively. The nanoparticles were further analysed for antimicrobial assays by well diffusion method against E. coli, S. aureus, P. aeruginosa, St. mutans and antifungal assay against the strains of C. albicans, A. niger and A. flavus. The highest zone of inhibition was observed against E.coli (1.7 cm) at a concentration of 400µg and maximum for C. albicans (2.5cm) at a concentration of 400µg. Microbial synthesized nanoparticles emerges as a promising medicine in curing different disorders because of its potent antioxidant and antimicrobial activity.

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Wang, Yidan, Yonghe Yu, Yuhua Duan, Qin Wang, Xin Cong, Yi He, Chao Gao et al. « Enhancing the Activity of Carboxymethyl Cellulase Enzyme Using Highly Stable Selenium Nanoparticles Biosynthesized by Bacillus paralicheniformis Y4 ». Molecules 27, n^o 14 (18 juillet 2022) : 4585. http://dx.doi.org/10.3390/molecules27144585.

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The inorganic selenium is absorbed and utilized inefficiently, and the range between toxicity and demand is narrow, so the application is strictly limited. Selenium nanoparticles have higher bioactivity and biosafety properties, including increased antioxidant and anticancer properties. Thus, producing and applying eco-friendly, non-toxic selenium nanoparticles in feed additives is crucial. Bacillus paralicheniformis Y4 was investigated for its potential ability to produce selenium nanoparticles and the activity of carboxymethyl cellulases. The selenium nanoparticles were characterized using zeta potential analyses, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). Additionally, evaluations of the anti-α-glucosidase activity and the antioxidant activity of the selenium nanoparticles and the ethyl acetate extracts of Y4 were conducted. B. paralicheniformis Y4 exhibited high selenite tolerance of 400 mM and the selenium nanoparticles had an average particle size of 80 nm with a zeta potential value of −35.8 mV at a pH of 7.0, suggesting that the particles are relatively stable against aggregation. After 72 h of incubation with 5 mM selenite, B. paralicheniformis Y4 was able to reduce it by 76.4%, yielding red spherical bio-derived selenium nanoparticles and increasing the carboxymethyl cellulase activity by 1.49 times to 8.96 U/mL. For the first time, this study reports that the carboxymethyl cellulase activity of Bacillus paralicheniforis was greatly enhanced by selenite. The results also indicated that B. paralicheniformis Y4 could be capable of ecologically removing selenite from contaminated sites and has great potential for producing selenium nanoparticles as feed additives to enhance the added value of agricultural products.

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El-Batal, A. « Synthesis of Selenium Nanoparticles by Bacillus laterosporus Using Gamma Radiation ». British Journal of Pharmaceutical Research 4, n^o 11 (10 janvier 2014) : 1364–86. http://dx.doi.org/10.9734/bjpr/2014/10412.

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Duan, Yuhua, Mengjun Li, Sishang Zhang, Yidan Wang, Jieya Deng, Qin Wang, Tian Yi et al. « Highly Efficient Biotransformation and Production of Selenium Nanoparticles and Polysaccharides Using Potential Probiotic Bacillus subtilis T5 ». Metabolites 12, n^o 12 (1 décembre 2022) : 1204. http://dx.doi.org/10.3390/metabo12121204.

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Selenium is an essential microelement required for human health. The biotransformation of selenium nanoparticles has attracted increasing attention in recent years. However, little of the literature has investigated the comprehensive evaluation of the strains for practical application and the effect on the functional properties in the existence of Se. The present study showed the selenite reduction strain Bacillus subtilis T5 (up to 200 mM), which could produce high yields of selenium polysaccharides and selenium nanoparticles in an economical and feasible manner. Biosynthesized selenium nanoparticles by B. subtilis T5 were characterized systematically using UV-vis spectroscopy, FTIR, Zeta Potential, DLS, and SEM techniques. The biosynthesized SeNPs exhibited high stability with small particle sizes. B. subtilis T5 also possessed a tolerance to acidic pH and bile salts, high aggregation, negative hemolytic, and superior antioxidant activity, which showed excellent probiotic potential and can be recommended as a potential candidate for the selenium biopharmaceuticals industry. Remarkably, B. subtilis T5 showed that the activity of α-amylase was enhanced with selenite treatment to 8.12 U/mL, 2.72-fold more than the control. The genus Bacillus was first reported to produce both selenium polysaccharides with extremely high Se-content (2.302 g/kg) and significantly enhance the activity to promote α-amylase with selenium treatment. Overall, B. subtilis T5 showed potential as a bio-factory for the biosynthesized SeNPs and organ selenium (selenium polysaccharide), providing an appealing perspective for the biopharmaceutical industry.

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Ratnakomala, Shanti, Nurul Fitri Sari, Fahrurrozi Fahrurrozi et Puspita Lisdiyanti. « Antimicrobial Activity of Selenium Nanoparticles Synthesized by Actinomycetes Isolated from Lombok Island Soil Samples ». Jurnal Kimia Terapan Indonesia 20, n^o 1 (21 août 2018) : 8–15. http://dx.doi.org/10.14203/jkti.v20i1.374.

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AbstractA total of 98 actinomycetes were isolated from the soil and litter samples collected from the cacao and coffee plantation in Lombok Island, West Nusa Tenggara, Indonesia. These isolates were screened for their antimicrobial activity. Among 98 isolated strains, only 24 isolates showed antimicrobial activity against test microorganisms of which 20.4% were active against Bacillus subtilis BTCC B-612, 14.3% against Staphylococcus aureus BTCC B-611, and 5.1% against Escherichia coli BTCC B-609. Out of these 24 isolates, 3 were found to be able to grow in medium containing 3 mM Selenium oxide of which the culture were changed color to red. Two of the best strains, L-155 and L-156, were selected for assessing production of Selenium nanoparticles. Bioreduction of selenium nanoparticles was confirmed by UV–visible spectrophotometer which showed peak between 300 and 320 nm. Biosynthesized selenium nanoparticle from isolate actinomycetes L-155 and L-156 were found to have a broad spectrum of activity against the tested microorganisms: Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Micrococcus luteus, and Candida albicans. This study showed rapid and eco-friendly synthesis of selenium nanoparticles from soil actinomycetes. Most of these active isolates revealed to possess antibacterial property.

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Thèses sur le sujet "Selenium nanoparticles bacillus mycoides"

Piacenza, Elena <1991&gt. « Biogenic selenium nanoparticles from Bacillus mycoides SeITE01 and their potential as antimicrobial agents ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2015. http://hdl.handle.net/10579/7287.

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This study is focused on biosynthesis and characterization of Selenium nanoparticles (SeNPs) by Bacillus mycoides SelTE01 (biogenic SeNPs), evaluating their ability as antimicrobial agents. In so doing, a comparison between biogenically and chemically synthesized SeNPs was carried out, in order to stress differences and similarities. During my project, I worked in the Environmental Microbiology Laboratory at University of Verona and in Biofilm Research Group at University of Calgary (Canada). At University of Verona, I synthesized biogenic SeNPs by Bacillus mycoides SelTE01 grown with Na2SeO3 and chemical SeNPs using L-cysteine, ascorbic acid or a mix of SDS and Na2S2O3. I also characterized both SeNPs using Dynamic Light Scattering (DLS), Z potential measurement, Scanning Electron Microscopy (SEM) analysis and Energy Disperse Spectrometer (EDS) analysis. In Biofilm Research Group in Calgary, I evaluated SeNPs antimicrobial activity against pathogenic biofilms, normally resistant to conventional methods of disinfection. I investigated SeNPs ability to inhibit biofilm formation, exposing pathogenic biofilms to different concentrations of SeNPs and using Minimum Biofilm Eradication Concentration (MBEC) test and Calgary Biofilm Device (CBD). MBEC test is a high throughput screening assay used to determine the efficacy of antimicrobials against biofilms. It’s based on use of CBD: particular 96-well plate in which one batch culture apparatus allows multiple species biofilms to be tested against a lot of variables. In particular, I used CBDs coated of hydroxyapatite (HA), component of bones and teeth. In so doing, I was able to verify that biogenic SeNPs have stronger antimicrobial activity than those chemically synthetized.

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