Articles de revues : « Selenium nanoparticles bacillus mycoides »

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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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abdallah, omnia, Khaled EL-Baghdady, Mostafa Khalil, Mervat El Borhamy et Gamal Meligi. « Biosynthesis, Characterization and Cytotoxicity of Selenium Nanoparticles Using Bacillus tropicus Ism 2 ». Egyptian Academic Journal of Biological Sciences, G. Microbiology 11, n^o 1 (1 janvier 2019) : 47–57. http://dx.doi.org/10.21608/eajbsg.2019.55269.

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Ullah, Asad, Xian Yin, Fenghuan Wang, Bo Xu, Zulfiqar Ali Mirani, Baocai Xu, Malik Wajid Hussain Chan et al. « Biosynthesis of Selenium Nanoparticles (via Bacillus subtilis BSN313), and Their Isolation, Characterization, and Bioactivities ». Molecules 26, n^o 18 (13 septembre 2021) : 5559. http://dx.doi.org/10.3390/molecules26185559.

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Among the trace elements, selenium (Se) has great demand as a health supplement. Compared to its other forms, selenium nanoparticles have minor toxicity, superior reactivity, and excellent bioavailability. The present study was conducted to produce selenium nanoparticles (SeNPs) via a biosynthetic approach using probiotic Bacillus subtilis BSN313 in an economical and easy manner. The BSN313 exhibited a gradual increase in Se reduction and production of SeNPs up to 5–200 µg/mL of its environmental Se. However, the capability was decreased beyond that concentration. The capacity for extracellular SeNP production was evidenced by the emergence of red color, then confirmed by a microscopic approach. Produced SeNPs were purified, freeze-dried, and subsequently characterized systematically using UV–Vis spectroscopy, FTIR, Zetasizer, SEM–EDS, and TEM techniques. SEM–EDS analysis proved the presence of selenium as the foremost constituent of SeNPs. With an average particle size of 530 nm, SeNPs were shown to have a −26.9 (mV) zeta potential and −2.11 µm cm/Vs electrophoretic mobility in water. SeNPs produced during both the 24 and 48 h incubation periods showed good antioxidant activity in terms of DPPH and ABST scavenging action at a concentration of 150 µg/mL with no significant differences (p > 0.05). Moreover, 200 µg/mL of SeNPs showed antibacterial reactivity against Escherichia coli ATCC 8739, Staphylococcus aureus ATCC 9027, and Pseudomonas aeruginosa ATCC 25923. In the future, this work will be helpful to produce biogenic SeNPs using probiotic Bacillus subtilis BSN313 as biofactories, with the potential for safe use in biomedical and nutritional applications.

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El-Zayat, Mustafa Mohsen, Mostafa M. Eraqi, Hani Alrefai, Ayman Y. El-Khateeb, Marwan A. Ibrahim, Hashim M. Aljohani, Maher M. Aljohani et Moustafa Mohammed Elshaer. « The Antimicrobial, Antioxidant, and Anticancer Activity of Greenly Synthesized Selenium and Zinc Composite Nanoparticles Using Ephedra aphylla Extract ». Biomolecules 11, n^o 3 (22 mars 2021) : 470. http://dx.doi.org/10.3390/biom11030470.

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The current work aimed to synthesize selenium and zinc nanoparticles using the aqueous extract of Ephedra aphylla as a valuable medicinal plant. The prepared nanoparticles were characterized by TEM, zeta potential, and changes in the phytochemical constituents. Hence, the phenolic, flavonoid, and tannin contents were reduced in the case of the prepared samples of nanoparticles than the original values in the aqueous extract. The prepared extract of Ephedra aphylla and its selenium and zinc nanoparticles showed high potency as antioxidant agents as a result of the DPPH• assay. The samples were assessed as anticancer agents against six tumor cells and a normal lung fibroblast (WI-38) cell line. The selenium nanoparticles of Ephedra aphylla extract revealed very strong cytotoxicity against HePG-2 cells (inhibitory concentration (IC50) = 7.56 ± 0.6 µg/mL), HCT-116 cells (IC50 = 10.02 ± 0.9 µg/mL), and HeLa cells (IC50 = 9.23 ± 0.8 µg/mL). The samples were evaluated as antimicrobial agents against bacterial and fungal strains. Thus, selenium nanoparticles showed potent activities against Gram-negative strains (Salmonella typhimurium, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Escherichia coli), Gram-positive strains (Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, and Staphylococcus epidermidis), and the fungal strain Candida albicans. In conclusion, the preparation of nanoparticles of either selenium or zinc is crucial for improved biological characteristics.

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Fischer, Sarah, Thomas Krause, Franziska Lederer, Mohamed L. Merroun, Anna Shevchenko, René Hübner, Tamas Firkala, Thorsten Stumpf, Norbert Jordan et Rohan Jain. « Bacillus safensis JG-B5T affects the fate of selenium by extracellular production of colloidally less stable selenium nanoparticles ». Journal of Hazardous Materials 384 (février 2020) : 121146. http://dx.doi.org/10.1016/j.jhazmat.2019.121146.

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WANG, Hua, Wei WEI, Sheng-yi ZHANG, Yu-xian SHEN, Ni-ping WANG, Li YUE et Shu-yun XU. « Melatonin-selenium nanoparticles protects liver against immunological injury induced by bacillus Calmette-Guérin and lipopolysaccharide ». Acta Pharmacologica Sinica 26, n^o 6 (juin 2005) : 745–52. http://dx.doi.org/10.1111/j.1745-7254.2005.00745.x.

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Agharezaie, Zeinab, Setareh Haghighat et Mohammad Hossein Yazdi. « Synthetic Nano-selenium Improving Macrophage Immune Responses Treatment of Bladder Tumor Antigens ». ImmunoRegulation 4, n^o 1 (1 juillet 2021) : 43–52. http://dx.doi.org/10.32598/immunoregulation.4.1.3.

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Background: Synthetic nanoparticles are deemed to improve treatment with the least adverse effects. The effect of Selenium Nanoparticles (SeNPs) was reviewed on various pathogenic disorders. In the present project, the role of SeNPs on macrophage responses was assessed. Materials and Methods: SeNPs were prepared synthetically by ascorbic acid. Macrophages (MQs) were cultured and treated with SeNPs in combination with bladder tumor lysate and Bacillus Calmette Guerin (BCG). Other experimental groups include SeNPs + tumor lysate + MQs, BCG, BCG+MQs, and MQs. The mRNA levels of interferon-γ and interleukin-10 were evaluated using the real-time PCR method. Results: Synthetic selenium nanoparticles combined with the tumor lysate upregulated the mRNA level of interferon-γ after 12 and 24 h treatment. Regarding interleukin-10 expression, there were no remarkable differences in all experimental groups. The maximum effect of synthetic SeNPs was observed after 24 h treatment. Conclusion: The optimum effect of synthetic SeNPs presents in a treatment-dependent manner.

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Al-Balakocy, NG, TM Hassan, SY Aly, SH Abd Elsalam et Mahmoud Hamouda Elshakankery. « Using nano technology for imparting PET/C blended fabric new functional performance properties ». Journal of Engineered Fibers and Fabrics 17 (janvier 2022) : 155892502211013. http://dx.doi.org/10.1177/15589250221101385.

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This article, discuss the effect of finishing polyester/cotton blended fabric (PET/C) with alkali and Titanium dioxide nanoparticles (TiO2 NPs) simultaneously. The treatment conditions such as NaOH and TiO2 NPs concentrations, reaction temperature and duration will be investigated. The effect of addition NPs on alkaline treatment conditions will prove through weight loss and carboxylic content. The ability of PET/C fabrics for loading with NPs during alkaline treatment was investigated by using SEM, EDX, and FTIR measurements. The effect of finishing of PET/C blended fabric with the suggested method on antimicrobial activity and ultraviolet protection was investigated. The simultaneous finishing of PET/C blended fabrics with alkali and TiO2 NPs showed excellent ultraviolet protection and high antimicrobial activity against Gram-positive ( Bacillus mycoides), Gram-negative ( Escherichia coli), and nonfilamentous fungus ( Candida albicans). The functional performance imparted to PET/C fabrics by the suggested approach are durable in repeated laundering processes, even after five Launder-Ometer washes.

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Abou Elmaaty, Tarek, Khaled Sayed-Ahmed, Hanan Elsisi, Shaimaa M. Ramadan, Heba Sorour, Mai Magdi et Shereen A. Abdeldayem. « Novel Antiviral and Antibacterial Durable Polyester Fabrics Printed with Selenium Nanoparticles (SeNPs) ». Polymers 14, n^o 5 (27 février 2022) : 955. http://dx.doi.org/10.3390/polym14050955.

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The COVID-19 pandemic has clearly shown the importance of developing advanced protective equipment, and new antiviral fabrics for the protection and prevention of life-threatening viral diseases are needed. In this study, selenium nanoparticles (SeNPs) were combined with polyester fabrics using printing technique to obtain multifunctional properties, including combined antiviral and antibacterial activities as well as coloring. The properties of the printed polyester fabrics with SeNPs were estimated, including tensile strength and color fastness. Characterization of the SeNPs was carried out using TEM and SEM. The results of the analysis showed good uniformity and stability of the particles with sizes range from 40–60 nm and 40–80 nm for SeNPs 25 mM and 50 mM, respectively, as well as uniform coating of the SeNPs on the fabric. In addition, the SeNPs—printed polyester fabric exhibited high disinfection activity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) with an inhibition percentage of 87.5%. Moreover, a toxicity test of the resulting printed fabric revealed low cytotoxicity against the HFB4 cell line. In contrast, the treated fabric under study showed excellent killing potentiality against Gram-positive bacteria (Bacillus cereus) and Gram-negative bacteria (Pseudomonas aeruginosa, Salmonella typhi, and Escherichia coli). This multifunctional fabric has high potential for use in protective clothing applications by providing passive and active protection pathways.

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Borah, Siddhartha Narayan, Lalit Goswami, Suparna Sen, Deepa Sachan, Hemen Sarma, Milka Montes, Jose R. Peralta-Videa, Kannan Pakshirajan et Mahesh Narayan. « Selenite bioreduction and biosynthesis of selenium nanoparticles by Bacillus paramycoides SP3 isolated from coal mine overburden leachate ». Environmental Pollution 285 (septembre 2021) : 117519. http://dx.doi.org/10.1016/j.envpol.2021.117519.

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Abou Elmaaty, Tarek, Khaled Sayed-Ahmed, Radwan Mohamed Ali, Kholoud El-Khodary et Shereen A. Abdeldayem. « Simultaneous Sonochemical Coloration and Antibacterial Functionalization of Leather with Selenium Nanoparticles (SeNPs) ». Polymers 14, n^o 1 (25 décembre 2021) : 74. http://dx.doi.org/10.3390/polym14010074.

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The development of antibacterial coatings for footwear components is of great interest both from an industry and consumer point of view. In this work, the leather material was developed taking advantage of the intrinsic antibacterial activity and coloring ability of selenium nanoparticles (SeNPs). The SeNPs were synthesized and implemented into the leather surface by using ultrasonic techniques to obtain simultaneous coloring and functionalization. The formation of SeNPs in the solutions was evaluated using UV/Vis spectroscopy and the morphology of the NPs was determined by transmission electron microscopy (TEM). The treated leather material (leather/SeNPs) was characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The effects of SeNPs on the coloration and antibacterial properties of the leather material were evaluated. The results revealed that the NPs were mostly spherical in shape, regularly distributed, and closely anchored to the leather surface. The particle size distribution of SeNPs at concentrations of 25 mM and 50 mM was in the range of 36–77 nm and 41–149 nm, respectively. It was observed that leather/SeNPs exhibited a higher depth of shade compared to untreated ones, as well as excellent fastness properties. The results showed that leather/SeNPs can significantly enhance the antibacterial activity against model of bacteria, including Gram-positive bacteria (Bacillus cereus) and Gram-negative bacteria (Pseudomonas aeruginosa, Salmonella typhi and Escherichia coli). Moreover, the resulting leather exhibited low cytotoxicity against HFB4 cell lines. This achievement should be quite appealing to the footwear industry as a way to prevent the spread of bacterial infection promoted by humidity, poor breathability and temperature which promote the expansion of the microflora of the skin.

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Ghazi, Azza A., Sahar El-Nahrawy, Hassan El-Ramady et Wanting Ling. « Biosynthesis of Nano-Selenium and Its Impact on Germination of Wheat under Salt Stress for Sustainable Production ». Sustainability 14, n^o 3 (4 février 2022) : 1784. http://dx.doi.org/10.3390/su14031784.

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Selenium and its derivatives have been found capable of excellent biological responses. However, the element in its bulk form has low bioavailability and increased toxicity, meaning the production of effective forms with sustainable methods has become urgent. Several microorganisms, including fungi, bacteria and yeast, as well as higher plants, are capable of biosynthesizing nanoparticles such as nano-selenium (nano-Se), which has wide applications in medicine, agriculture and industry. Thus, the biosynthesis of nano-Se using some bacterial species was the main target of this study. The production of nano-Se and the monitoring of its impact on the wheat germination of seeds under salt stress (i.e., 50, 100, and 150 mM NaCl) was also evaluated in the current study. The ameliorative role of nano-Se doses (i.e., 50, 75, and 100 mg L−1) in the germination of wheat seeds under salt stress was also investigated. Based on sodium selenite tolerance and reducing selenite to elemental Se-NPs, the most effective isolate (TAH) was selected for identification using the 16S rRNA gene sequence, which belonged to Bacillus cereus TAH. The final germination percent, mean germination time, vigor index and germination rate index were improved by 25, 25, 39.4 and 11%, respectively, under 15 mM sodium chloride concentration when 100 mg L−1 nano-selenium was used. On the other hand, the results obtained from a gnotobiotic sand system reveal that with treatment with 100 mg L−1 nano-selenium under high Ec values of 14 ds m−1, the vegetative growth parameters of shoot length, root length, fresh weight and dry weight were improved by 22.8, 24.9, 19.2 and 20%, respectively, over untreated controls. The data obtained from this study reveal that the use of nano-selenium produced by Bacillus cereus offers improved wheat seed germination under a salt-affected environment.

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Hashem, Amr H., Amer M. Abdelaziz, Ahmed A. Askar, Hossam M. Fouda, Ahmed M. A. Khalil, Kamel A. Abd-Elsalam et Mona M. Khaleil. « Bacillus megaterium-Mediated Synthesis of Selenium Nanoparticles and Their Antifungal Activity against Rhizoctonia solani in Faba Bean Plants ». Journal of Fungi 7, n^o 3 (9 mars 2021) : 195. http://dx.doi.org/10.3390/jof7030195.

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Rhizoctonia root-rot disease causes severe economic losses in a wide range of crops, including Vicia faba worldwide. Currently, biosynthesized nanoparticles have become super-growth promoters as well as antifungal agents. In this study, biosynthesized selenium nanoparticles (Se-NPs) have been examined as growth promoters as well as antifungal agents against Rhizoctonia solani RCMB 031001 in vitro and in vivo. Se-NPs were synthesized biologically by Bacillus megaterium ATCC 55000 and characterized by using UV-Vis spectroscopy, XRD, dynamic light scattering (DLS), and transmission electron microscopy (TEM) imaging. TEM and DLS images showed that Se-NPs are mono-dispersed spheres with a mean diameter of 41.2 nm. Se-NPs improved healthy Vicia faba cv. Giza 716 seed germination, morphological, metabolic indicators, and yield. Furthermore, Se-NPs exhibited influential antifungal activity against R. solani in vitro as well as in vivo. Results revealed that minimum inhibition and minimum fungicidal concentrations of Se-NPs were 0.0625 and 1 mM, respectively. Moreover, Se-NPs were able to decrease the pre-and post-emergence of R. solani damping-off and minimize the severity of root rot disease. The most effective treatment method is found when soaking and spraying were used with each other followed by spraying and then soaking individually. Likewise, Se-NPs improve morphological and metabolic indicators and yield significantly compared with infected control. In conclusion, biosynthesized Se-NPs by B. megaterium ATCC 55000 are a promising and effective agent against R. solani damping-off and root rot diseases in Vicia faba as well as plant growth inducer.

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Wang, Hua, Wei Wei, Sheng-Yi Zhang, Yu-Xian Shen, Li Yue, Ni-Ping Wang et Shu-Yun Xu. « Melatonin-selenium nanoparticles inhibit oxidative stress and protect against hepatic injury induced by Bacillus Calmette-Guérin/lipopolysaccharide in mice ». Journal of Pineal Research 39, n^o 2 (29 avril 2005) : 156–63. http://dx.doi.org/10.1111/j.1600-079x.2005.00231.x.

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Akçay, Fikriye Alev, et Ayşe Avcı. « Effects of process conditions and yeast extract on the synthesis of selenium nanoparticles by a novel indigenous isolate Bacillus sp. EKT1 and characterization of nanoparticles ». Archives of Microbiology 202, n^o 8 (12 juin 2020) : 2233–43. http://dx.doi.org/10.1007/s00203-020-01942-8.

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Abou Elmaaty, Tarek M., Shereen A. Abdeldayem et Nashwa Elshafai. « Simultaneous Thermochromic Pigment Printing and Se-NP Multifunctional Finishing of Cotton Fabrics for Smart Childrenswear ». Clothing and Textiles Research Journal 38, n^o 3 (21 janvier 2020) : 182–95. http://dx.doi.org/10.1177/0887302x19899992.

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Thermochromic (TC) pigments offer significant potential for functional and aesthetic design of smart textile materials. In this study, TC (blue and red) pigments were applied to cotton fabrics and printed on especially designed childrenswear by flat screen printing technique. The antibacterial and ultraviolet protection functionalities have been implemented into the fabrics under study by using selenium nanoparticles. The factors affecting the printing process were studied and the optimum formula was screen printed to produce the pattern’s designs of childrenswear. After conducting several tests, the results showed a significant color-changing effect depending on temperature, the color fastness properties to light, wash, and rubbing were excellent. Antibacterial activity of printed fabrics was very good against Bacillus cereus and Escherichia coli bacteria and the anti-ultraviolet protection was found to be very good. The printed fabrics can be as protective childrenswear as shown in this work.

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Vijayakumar, Gayathri, Hyung Joo Kim et Senthil Kumaran Rangarajulu. « In Vitro Antibacterial and Wound Healing Activities Evoked by Silver Nanoparticles Synthesized through Probiotic Bacteria ». Antibiotics 12, n^o 1 (10 janvier 2023) : 141. http://dx.doi.org/10.3390/antibiotics12010141.

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The prospective application of probiotics is an adjuvant for the advancement of novel antimicrobial and wound-healing agents. Currently, probiotic bacteria are utilized for the biosynthesis of nanoparticles in the development of innovative therapeutics. The present study aimed at using nanoparticle-conjugated probiotic bacteria for enhanced antibacterial and wound-healing activity. In the present investigation, the probiotic bacteria were isolated from a dairy source (milk from domestic herbivores). They screened for antibacterial activity against infection-causing Gram-negative (Pseudomonas aeruginosa and Escherichia coli) and Gram-positive (Bacillus subtilis and Staphylococcus aureus) pathogens. Further, the probiotic strain with higher bactericidal activity was used to synthesize silver, selenium, and copper nanoparticles. The isolated strain was found to be Lactiplantibacillus plantarum and it only has the ability to synthesize silver nanoparticles. This was verified using Ultra violet-Visible (UV-Vis) spectroscopy, where the test solution turned brown and the greatest UV-Vis absorptions peaked at 425 nm. Optimization studies on the synthesis of AgNPs (silver nanoparticles) are presented and the results show that stable synthesis was obtained by using a concentration of 1mM silver nitrate (AgNO3) at a temperature of 37 °C with pH 8. The FTIR (Fourier transform infrared spectroscopy) study confirmed the involvement of functional groups from the cell biomass that were involved in the reduction process. Additionally, biosynthesized AgNPs showed increased antioxidant and antibacterial activities. The nano silver had a size distribution of 14 nm and was recorded with HR-TEM (high-resolution transmission electron microscopy) examination. The EDX (energy dispersive X-ray) analysis revealed 57% of silver groups found in the nanoparticle production. The biosynthesized AgNPs show significant wound-healing capabilities with 96% of wound closure (fibroblast cells) being observed through an in vitro scratch-wound assay. The cytotoxic experiments demonstrated that the biosynthesized AgNPs are not extremely hazardous to the fibroblast cells. The present study provides a new platform for the green synthesis of AgNPs using probiotic bacteria, showing significant antibacterial and wound-healing potentials against infectious pathogens.

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Baggio, Greta, Ryan A. Groves, Roberto Chignola, Elena Piacenza, Alessandro Presentato, Ian A. Lewis, Silvia Lampis, Giovanni Vallini et Raymond J. Turner. « Untargeted Metabolomics Investigation on Selenite Reduction to Elemental Selenium by Bacillus mycoides SeITE01 ». Frontiers in Microbiology 12 (16 septembre 2021). http://dx.doi.org/10.3389/fmicb.2021.711000.

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Bacillus mycoides SeITE01 is an environmental isolate that transforms the oxyanion selenite (SeO32−) into the less bioavailable elemental selenium (Se0) forming biogenic selenium nanoparticles (Bio-SeNPs). In the present study, the reduction of sodium selenite (Na2SeO3) by SeITE01 strain and the effect of SeO32− exposure on the bacterial cells was examined through untargeted metabolomics. A time-course approach was used to monitor both cell pellet and cell free spent medium (referred as intracellular and extracellular, respectively) metabolites in SeITE01 cells treated or not with SeO32−. The results show substantial biochemical changes in SeITE01 cells when exposed to SeO32−. The initial uptake of SeO32− by SeITE01 cells (3h after inoculation) shows both an increase in intracellular levels of 4-hydroxybenzoate and indole-3-acetic acid, and an extracellular accumulation of guanosine, which are metabolites involved in general stress response adapting strategies. Proactive and defensive mechanisms against SeO32− are observed between the end of lag (12h) and beginning of exponential (18h) phases. Glutathione and N-acetyl-L-cysteine are thiol compounds that would be mainly involved in Painter-type reaction for the reduction and detoxification of SeO32− to Se0. In these growth stages, thiol metabolites perform a dual role, both acting against the toxic and harmful presence of the oxyanion and as substrate or reducing sources to scavenge ROS production. Moreover, detection of the amino acids L-threonine and ornithine suggests changes in membrane lipids. Starting from stationary phase (24 and 48h), metabolites related to the formation and release of SeNPs in the extracellular environment begin to be observed. 5-hydroxyindole acetate, D-[+]-glucosamine, 4-methyl-2-oxo pentanoic acid, and ethanolamine phosphate may represent signaling strategies following SeNPs release from the cytoplasmic compartment, with consequent damage to SeITE01 cell membranes. This is also accompanied by intracellular accumulation of trans-4-hydroxyproline and L-proline, which likely represent osmoprotectant activity. The identification of these metabolites suggests the activation of signaling strategies that would protect the bacterial cells from SeO32− toxicity while it is converting into SeNPs.

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Órdenes-Aenishanslins, Nicolás Alexis, Luis Alberto Saona, Vicente María Durán-Toro, Juan Pablo Monrás, Denisse Margarita Bravo et José Manuel Pérez-Donoso. « Use of titanium dioxide nanoparticles biosynthesized by Bacillus mycoides in quantum dot sensitized solar cells ». Microbial Cell Factories 13, n^o 1 (16 juillet 2014). http://dx.doi.org/10.1186/s12934-014-0090-7.

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Liu, Jun, Wen-Yu Qi, Hui Chen, Chao Song, Qiang Li et Shu-Guang Wang. « Selenium Nanoparticles as an Innovative Selenium Fertilizer Exert Less Disturbance to Soil Microorganisms ». Frontiers in Microbiology 12 (13 septembre 2021). http://dx.doi.org/10.3389/fmicb.2021.746046.

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Selenium (Se) is an essential trace element in the human body. Se-enriched agricultural products, obtained by applying Se fertilizer, are important sources of Se supplement. However, Se fertilizer may cause a series of environmental problems. This study investigated the transformation of exogenous selenium nanoparticles (SeNPs) and selenite (SeO32–) in soil and explored their effects on soil microbial community and typical microorganisms. SeNPs exhibited a slow-release effect in soil, which promoted the growth of soil microorganisms and enriched soil probiotics. SeO32– was converted to a stable and low toxic state in soil, increasing persistent free radicals and decreasing microbial abundance and diversity. The influences of SeNPs and SeO32– on two typical soil microorganisms (Bacillus sp. and Escherichia coli) were also evaluated, and SeNPs were more difficult to enter into microorganisms directly, with lower toxicity and higher safety. These results indicated that SeNPs were a more environment-friendly Se additive for agriculture applications. This work provides useful information for better understanding the environmental fate and behavior of Se fertilizer in the soil.

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Huang, Sisi, Kan Yu, Liang Wen, Xiaoling Long, Jin Sun, Quxiao Liu, Zhuo Zheng, Wei Zheng, Hongmei Luo et Jinlong Liu. « Development and application of a new biological nano-selenium fermentation broth based on Bacillus subtilis SE201412 ». Scientific Reports 13, n^o 1 (13 février 2023). http://dx.doi.org/10.1038/s41598-023-29737-z.

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AbstractIn order to improve the functionality and additional value of agricultural products, this study developing nano-selenium fermentation broth and established a new application strategy of bio-nano-selenium by screening and identifying selenium-rich microorganisms. We isolated a new strain from tobacco waste and named it Bacillus subtilis SE201412 (GenBank accession no. OP854680), which could aerobically grow under the condition of 66,000 mg L−1 selenite concentration, and could convert 99.19% of selenite into biological nano-selenium (BioSeNPs) within 18 h. Using strain SE201412, we industrially produced the different concentrations of fermentation broth containing 5000–3000 mg L−1 pure selenium for commercial use. The synthesized selenium nanoparticles (SeNPs) were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nanoparticle tracking analysis (NTA). TEM and SEM results showed that SeNPs were distributed outside cells. NTA assay of fermentation broth indicated that the nanoparticles were spherical with an average particle size of 126 ± 0.5 nm. Toxicity test revealed that the median lethal dose (LD50) of the fermentation broth to mice was 2710 mg kg−1, indicating its low toxicity and high safety. In addition, we applied BioSeNP fermentation broth to rice and wheat through field experiments. The results showed that the application of fermentation broth significantly increased the total selenium content and organic selenium percentage in rice and wheat grains. Our findings provide valuable reference for the development of BioSeNPs with extensive application prospects.

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Pradeep, Malavika, Lakshminarayanan Arivarasu, S. Rajeshkumar et Lakshmi Thangavelu. « Antimicrobial Activity of Selenium Nanoparticles and Pterocarpus santalinus Based Mouthwash ». Journal of Pharmaceutical Research International, 28 décembre 2021, 372–83. http://dx.doi.org/10.9734/jpri/2021/v33i61b35610.

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Introduction: Their unique size-dependent properties make these materials superior and indispensable in many areas of human activity. Selenium possesses excellent photo electrical and semiconductor properties which make it extensively used in duplicate, photography, cells and rectifiers. Selenium is also one of essential trace elements in the human body and has great importance in nourishment and medicine. In India, medicinal plants are widely used by all sections of people either directly as folk remedies or in different indigenous systems of medicine or indirectly in the pharmaceutical preparations of modern medicines. The aim of the present study is to determine antimicrobial activity of selenium nanoparticles and Pterocarpus santalinus based mouthwash. Materials and Methods: Antimicrobial activity of respective nanoparticles against the strain staphylococcus aureus, Bacillus and E Coli. MH Aagar was utilized for this activity to determine the zone of inhibition. Muller hinton agar was prepared and sterilized for 45 minutes at 120 lbs. Media poured into the sterilized plates and let them stabilize for solidification. The wells were cut using the well cutter and the test organisms were swabbed. The nanoparticles with different concentrations were loaded and the plates were incubated for 24 hours at 37 degree celsius. After the incubation the zones of inhibition were measured. Results: The highest zones of inhibition were exhibited against two bacterial strains Staphylococcus aureus and Staphylococcus mutans proving that it acts as a good antibacterial against S.aureus and S.mutans infections.

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Ashengroph, Morahem, et Seyedeh-Roya Hosseini. « A newly isolated Bacillus amyloliquefaciens SRB04 for the synthesis of selenium nanoparticles with potential antibacterial properties ». International Microbiology, 29 octobre 2020. http://dx.doi.org/10.1007/s10123-020-00147-9.

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Ma, Jing, Yuhang Li, Fu Chen, Yan Sun, Yanfeng Zhu et Liping Wang. « Bacillus mycoides PM35 in combination with titanium dioxide (TiO2)⎯nanoparticles enhanced morpho-physio-biochemical attributes in Barley (Hordeum vulgare L.) under cadmium stress ». Chemosphere, février 2023, 138224. http://dx.doi.org/10.1016/j.chemosphere.2023.138224.

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Shakibaie, Mojtaba, Naser Salari Mohazab et Seyyed Amin Ayatollahi Mousavi. « Antifungal Activity of Selenium Nanoparticles Synthesized by Bacillus species Msh-1 Against Aspergillus fumigatus and Candida albicans ». Jundishapur Journal of Microbiology 8, n^o 9 (8 septembre 2015). http://dx.doi.org/10.5812/jjm.26381.

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« Bio-manufacturing of selenium nanoparticles by Bacillus subtilis isolated from Qarun Lake and evaluation their activity for water remediation ». Biointerface Research in Applied Chemistry 10, n^o 4 (18 avril 2020) : 5834–42. http://dx.doi.org/10.33263/briac104.834842.

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Selenium nanoparticles (Se-NPS) have gently stimulated more extensive interest due to their vital properties. During this intensive investigation, we have to tend to restrict aquatic bacteria isolated from Qarun Lake for the inexperienced green synthesis of nanoselenium and its potential applications as antimicrobial for water purification. Twenty-four distinctive bacterial isolates were purified and screened for selenite resistance, and ten were positive. Out of them, isolate of Bats2 had been excellently tolerant of sodium selenite with minimal inhibitory concentrations (MIC) 18 g/l. They have continually been the best isolate in the manufacture of Se-NPS with maximal coloration and absorbance at 420 nm, in 3 days growth at pH 7 and 35 °C with 1g/l sodium selenite. The strongest extracellular biomanufacturing of Se-NPS has been properly identified as Bacillus subtilis. The facile fabricated Se-NPS by the acceptable and most powerful isolate Bacillus subtilis have been consistently characterized using UV-visible spectroscopy, XRD, SEM and TEM techniques. Biosynthesized Nanoparticles had diameter of 31-193 nm using and the typical XRD patterns sufficiently established the imprecise nature of the fabricated nanoparticles. The significant impact of Se-NPs was fastidiously observed on the potential growth of pathogenic Gram-positive and Gram-negative bacteria. Our desired outcomes absolutely confirmed the antimicrobial activity of Se-NPs only against Staphylococcus aureus. Thus, bacterial Se-NPs composite might realize appropriate application as a bioremediation tool of pathogens in required water.

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Filipović, Nenad, Dušan Ušjak, Marina T. Milenković, Kai Zheng, Liliana Liverani, Aldo R. Boccaccini et Magdalena M. Stevanović. « Comparative Study of the Antimicrobial Activity of Selenium Nanoparticles With Different Surface Chemistry and Structure ». Frontiers in Bioengineering and Biotechnology 8 (25 janvier 2021). http://dx.doi.org/10.3389/fbioe.2020.624621.

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Although selenium nanoparticles (SeNPs) have gained attention in the scientific community mostly through investigation of their anticancer activity, a great potential of this nanomaterial was recognized recently regarding its antimicrobial activity. The particle form, size, and surface chemistry have been recognized as crucial parameters determining the interaction of nanomaterials with biological entities. Furthermore, considering a narrow boundary between beneficial and toxic effects for selenium per se, it is clear that investigations of biomedical applications of SeNPs are very demanding and must be done with great precautions. The goal of this work is to evaluate the effects of SeNPs surface chemistry and structure on antimicrobial activity against several common bacterial strains, including Staphylococcus aureus (ATCC 6538), Enterococcus faecalis (ATCC 29212), Bacillus subtilis (ATCC 6633), and Kocuria rhizophila (ATCC 9341), as well as Escherichia coli (ATCC 8739), Salmonella Abony (NCTC 6017), Klebsiella pneumoniae (NCIMB 9111) and Pseudomonas aeruginosa (ATCC 9027), and the standard yeast strain Candida albicans (ATCC 10231). Three types of SeNPs were synthesized by chemical reduction approach using different stabilizers and reducing agents: (i) bovine serum albumin (BSA) + ascorbic acid, (ii) chitosan + ascorbic acid, and (iii) with glucose. A thorough physicochemical characterization of the obtained SeNPs was performed to determine the effects of varying synthesis parameters on their morphology, size, structure, and surface chemistry. All SeNPs were amorphous, with spherical morphology and size in the range 70–300 nm. However, the SeNPs obtained under different synthesis conditions, i.e. by using different stabilizers as well as reducing agents, exhibited different antimicrobial activity as well as cytotoxicity which are crucial for their applications. In this paper, the antimicrobial screening of the selected systems is presented, which was determined by the broth microdilution method, and inhibitory influence on the production of monomicrobial and dual-species biofilm was evaluated. The potential mechanism of action of different systems is proposed. Additionally, the cytotoxicity of SeNPs was examined on the MRC-5 cell line, in the same concentration interval as for antimicrobial testing. It was shown that formulation SeNPs-BSA expressed a significantly lower cytotoxic effect than the other two formulations.

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Kora, Aruna Jyothi. « Bacillus cereus, selenite-reducing bacterium from contaminated lake of an industrial area : a renewable nanofactory for the synthesis of selenium nanoparticles ». Bioresources and Bioprocessing 5, n^o 1 (25 juin 2018). http://dx.doi.org/10.1186/s40643-018-0217-5.

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Cittrarasu, Vetrivel, Durairaj Kaliannan, Kalaimurugan Dharman, Viji Maluventhen, Murugesh Easwaran, Wen Chao Liu, Balamuralikrishnan Balasubramanian et Maruthupandian Arumugam. « Green synthesis of selenium nanoparticles mediated from Ceropegia bulbosa Roxb extract and its cytotoxicity, antimicrobial, mosquitocidal and photocatalytic activities ». Scientific Reports 11, n^o 1 (13 janvier 2021). http://dx.doi.org/10.1038/s41598-020-80327-9.

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AbstractThe present study is to design an eco-friendly mode to rapidly synthesize selenium nanoparticles (SeNPs) through Ceropegia bulbosa tuber’s aqueous extracts and confirming SeNPs synthesis by UV–Vis spectroscopy, FT-IR, XRD, FE-SEM-EDS mapping, HR-TEM, DLS and zeta potential analysis. In addition, to assess the anti-cancer efficacy of the SeNPs against the cultured MDA-MB-231, as studies have shown SeNPs biosynthesis downregulates the cancer cells when compared to normal HBL100 cell lines. The study observed the IC50 value of SeNPs against MDA-MB-231 cells was 34 µg/mL for 48 h. Furthermore, the SeNPs promotes growth inhibitory effects of certain clinical pathogens such as Bacillus subtilis and Escherichia coli. Apart, from this the SeNPs has shown larvicidal activity after 24 h exposure in Aedes albopitus mosquito’s larvae with a maximum of 250 g/mL mortality concentration. This is confirmed by the histopathology results taken at the 4th larval stage. The histopathological studies revealed intense deterioration in the hindgut, epithelial cells, mid gut and cortex region of the larvae. Finally, tried to investigate the photocatalytic activity of SeNPs against the toxic dye, methylene blue using halogen lamp and obtained 96% degradation results. Withal computational study SeNPs was shown to exhibit consistent stability towards breast cancer protein BRCA2. Overall, our findings suggest SeNPs as a potent disruptive agent for MDA-MB-231 cells, few pathogens, mosquito larvae and boosts the photocatalytic dye degradation.

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Saad, Ahmed M., Mahmoud Z. Sitohy, Mohamad I. Sultan-Alolama, Khaled A. El-Tarabily et Mohamed T. El-Saadony. « Green nanotechnology for controlling bacterial load and heavy metal accumulation in Nile tilapia fish using biological selenium nanoparticles biosynthesized by Bacillus subtilis AS12 ». Frontiers in Microbiology 13 (23 décembre 2022). http://dx.doi.org/10.3389/fmicb.2022.1015613.

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Heavy metal accumulation and pathogenic bacteria cause adverse effects on aquaculture. The active surface of selenium (Se) nanoparticles can mitigate these effects. The present study used Se-resistant Bacillus subtilis AS12 to fabricate biological Se nanoparticles (Bio-SeNPs). The double-edged Bio-SeNPs were tested for their ability to reduce the harmful effects of heavy metals and bacterial load in Nile tilapia (Oreochromis niloticus) and their respective influences on fish growth, behavior, and health. The Bio-SeNPs have a spherical shape with an average size of 77 nm and high flavonoids and phenolic content (0.7 and 1.9 g g−1 quercetin and gallic acid equivalents, respectively), resulting in considerable antioxidant and antibacterial activity. The Bio-SeNPs (3–5 μg ml−1) in the current study resolved two serious issues facing the aquaculture industry, firstly, the population of pathogenic bacteria, especially Aeromonas hydrophilia, which was reduced by 28–45% in fish organs. Secondly, heavy metals (Cd and Hg) at two levels (1 and 2 μg ml−1) were reduced by 50–87% and 57–73% in response to Bio-SeNPs (3–5 μg ml−1). Thus, liver function parameters were reduced, and inner immunity was enhanced. The application of Bio-SeNPs (3–5 μg ml−1) improved fish gut health, growth, and behavior, resulting in fish higher weight gain by 36–52% and a 40% specific growth rate, compared to controls. Furthermore, feeding and arousal times increased by 20–22% and 28–53%, respectively, while aggression time decreased by 78% compared to the control by the same treatment. In conclusion, Bio-SeNPs can mitigate the accumulation of heavy metals and reduce the bacterial load in a concentration-dependent manner, either in the fish media or fish organs.

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