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https://www.readbyqxmd.com/read/28646447/microbial-transformations-of-selenite-by-methane-oxidizing-bacteria
#1
Abdurrahman S Eswayah, Thomas J Smith, Andreas C Scheinost, Nicole Hondow, Philip H E Gardiner
Methane-oxidizing bacteria are well known for their role in the global methane cycle and their potential for microbial transformation of wide range of hydrocarbon and chlorinated hydrocarbon pollution. Recently, it has also emerged that methane-oxidizing bacteria interact with inorganic pollutants in the environment. Here, we report what we believe to be the first study of the interaction of pure strains of methane-oxidizing bacteria with selenite. Results indicate that the commonly used laboratory model strains of methane-oxidizing bacteria, Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b, are both able to reduce the toxic selenite (SeO3(2-)) but not selenate (SeO4(2-)) to red spherical nanoparticulate elemental selenium (Se(0)), which was characterized via energy-dispersive X-ray spectroscopy (EDXS), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)...
June 23, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28610394/facile-synthesis-and-optical-properties-of-small-selenium-nanocrystals-and-nanorods
#2
Fengrui Jiang, Weiquan Cai, Guolong Tan
Selenium is an important element for human's health, small size is very helpful for Se nanoparticles to be absorbed by human's body. Here, we present a facile approach to fabrication of small selenium nanoparticles (Nano-Se) as well as nanorods by dissolving sodium selenite (Na2SeO3) in glycerin and using glucose as the reduction agent. The as-prepared selenium nanoparticles have been characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy and high resolution transmission electron microscope (HRTEM)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28607388/aerobic-biogenesis-of-selenium-nanoparticles-by-enterobacter-cloacae-z0206-as-a-consequence-of-fumarate-reductase-mediated-selenite-reduction
#3
Deguang Song, Xiaoxiao Li, Yuanzhi Cheng, Xiao Xiao, Zeqing Lu, Yizhen Wang, Fengqin Wang
In the present study, we examined the ability of Enterobacter cloacae Z0206 to reduce toxic sodium selenite and mechanism of this process. E. cloacae Z0206 was found to completely reduce up to 10 mM selenite to elemental selenium (Se°) and form selenium nanoparticles (SeNPs) under aerobic conditions. The selenite reducing effector of E. cloacae Z0206 cell was to be a membrane-localized enzyme. iTRAQ proteomic analysis revealed that selenite induced a significant increase in the expression of fumarate reductase...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592284/biogenic-selenium-nanoparticles-induce-ros-mediated-necroptosis-in-pc-3-cancer-cells-through-tnf-activation
#4
Praveen Sonkusre, Swaranjit Singh Cameotra
BACKGROUND: Selenium is well documented to inhibit cancer at higher doses; however, the mechanism behind this inhibition varies widely depending on the cell type and selenium species. Previously, we have demonstrated that Bacillus licheniformis JS2 derived biogenic selenium nanoparticles (SeNPs) induce non-apoptotic cell death in prostate adenocarcinoma cell line, PC-3, at a minimal concentration of 2 µg Se/ml, without causing toxicity to the primary cells. However, the mechanism behind its anticancer activity was elusive...
June 7, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28572579/trichogenic-selenium-nanoparticles-enhance-disease-suppressive-ability-of-trichoderma-against-downy-mildew-disease-caused-by-sclerospora-graminicola-in-pearl-millet
#5
Boregowda Nandini, Puttaswamy Hariprasad, Harischandra Sripathy Prakash, Hunthrike Shekar Shetty, Nagaraja Geetha
Trichoderma spp. are well known biocontrol agents used against phytopathogens. In the present work Trichoderma-mediated Selenium nanoparticles (SeNPs) were synthesized and extent of downy mildew (DM) disease control in pearl millet (PM) was studied. Six species of Trichoderma namely, T. asperellum, T. harzianum, T. atroviride, T. virens, T. longibrachiatum and T. brevicompactum were evaluated in the form of culture filtrate (CF), cell lysate (CL) and crude cell wall (CW) to synthesize SeNPs. All these components produced SeNPs, but CF was significant than CL and CW...
June 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28555093/enhanced-adsorption-of-selenium-ions-from-aqueous-solution-using-iron-oxide-impregnated-carbon-nanotubes
#6
Omer Y Bakather, Ahmad Kayvani Fard, Ihsanullah, Majeda Khraisheh, Mustafa S Nasser, Muataz Ali Atieh
The aim of this research was to investigate the potential of raw and iron oxide impregnated carbon nanotubes (CNTs) as adsorbents for the removal of selenium (Se) ions from wastewater. The original and modified CNTs with different loadings of Fe2O3 nanoparticles were characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), Brunauer, Emmett, and Teller (BET) surface area analyzer, thermogravimetric analysis (TGA), zeta potential, and energy dispersive X-ray spectroscopy (EDS)...
2017: Bioinorganic Chemistry and Applications
https://www.readbyqxmd.com/read/28539272/selenium-nanoparticles-as-versatile-carriers-for-oral-delivery-of-insulin-insight-into-the-synergic-antidiabetic-effect-and-mechanism
#7
Wenji Deng, Qian Xie, Huan Wang, Zhiguo Ma, Baojian Wu, Xingwang Zhang
Oral insulin delivery has been plagued by limited bioavailability. This work reports selenium nanoparticles (SeNPs) for oral insulin delivery to overcome the absorption barrier. Insulin-loaded SeNPs (INS-SeNPs) were fabricated by ionic cross-linking/in situ reduction and characterized by particle size and drug entrapment. The resultant INS-SeNPs were 120nm around in particle size with high drug loading. INS-SeNPs exhibited controllable insulin release and outstanding stability in the digestive fluids. INS-SeNPs caused a significant hypoglycemic effect in both normal and diabetic rats...
May 21, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28530192/preparation-structural-characterisation-and-release-study-of-novel-hybrid-microspheres-entrapping-nanoselenium-produced-by-green-synthesis
#8
Simona Cavalu, Jόszef Prokisch, Vasile Laslo, Simona Vicas
The main goal of this study was to synthesise and characterise different formulations based on alginate and alginate/chitosan microspheres containing nanoselenium (nano-Se) for controlled delivery applications. Nanosize elemental selenium was produced by using probiotic yogurt bacteria (Lactobacillus casei) in a fermentation procedure. The structural and morphological characterisation of the microspheres was performed by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28527991/lignosulfonate-stabilized-selenium-nanoparticles-and-their-deposition-on-spherical-silica
#9
Anna Modrzejewska-Sikorska, Emilia Konował, Łukasz Klapiszewski, Grzegorz Nowaczyk, Stefan Jurga, Teofil Jesionowski, Grzegorz Milczarek
We report a novel room-temperature synthesis of selenium nanoparticles, which for the first time uses lignosulfonate as a stabilizer. Various lignosulfonates obtained both from hardwood and softwood were tested. Selenium oxide was used as the precursor of zero-valent selenium. Three different reducers were tested - sodium borohydride, hydrazine and ascorbic acid - and the latter proved most effective in terms of the particle size and stability of the final colloid. The lignosulfonate-stabilized selenium nanoparticles had a negative zeta potential, dependent on pH, which for some lignosulfonates reached -50mV, indicating the excellent stability of the colloid...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28515441/fluorescence-dynamics-of-the-biosynthesized-cdse-quantum-dots-in-candida-utilis
#10
Li-Jiao Tian, Nan-Qing Zhou, Xian-Wei Liu, Xing Zhang, Ting-Ting Zhu, Ling-Li Li, Wen-Wei Li, Han-Qing Yu
Organisms served as factories of bio-assembly of nanoparticles attracted a lot of attentions due to the safe, economic and environmental-benignity traits, especially the fabrication of the super fluorescence properties quantum dots (QDs). However, information about the developmental dynamics of QDs in living organisms is still lacking. In this work, we synthesized cadmium-selenium (CdSe) QDs in Candida utilis WSH02-08, and then tracked and quantitatively characterized the developmental dynamics (photoactivation, photostable and photobleaching processes) of bio-QDs by translating fluorescence microscopy movies into visual quantitative curve...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28510423/phycocyanin-functionalized-selenium-nanoparticles-reverse-palmitic-acid-induced-pancreatic-%C3%AE-cell-apoptosis-by-enhancing-cellular-uptake-and-blocking-reactive-oxygen-species-ros-mediated-mitochondria-dysfunction
#11
Chang Liu, Yuanting Fu, Chang-E Li, Tianfeng Chen, Xiaoling Li
Accumulation of palmitic acid (PA) in human bodies could cause damage to pancreatic β cells and lead to chronic diseases by generation of reactive oxygen species (ROS). Therefore, it is of great significance to search for nutrition-available agents with antioxidant activity to protect pancreatic islet cells against PA-induced damage. Phycocyanin (PC) and selenium (Se) have been reported to have excellent antioxidant activity. In this study, PC-functionalized selenium nanoparticles (PC-SeNPs) were synthesized to investigate the in vitro protective effects on INS-1E rat insulinoma β cells against PA-induced cell death...
June 7, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28499854/curcumin-loading-potentiates-the-chemotherapeutic-efficacy-of-selenium-nanoparticles-in-hct116-cells-and-ehrlich-s-ascites-carcinoma-bearing-mice
#12
Manisha Kumari, L Ray, M P Purohit, S Patnaik, A B Pant, Y Shukla, P Kumar, K C Gupta
The anticancer properties of selenium (Se) and curcumin nanoparticles in solo formulations as well as in combination with other therapeutic agents have been proved time and again. Exploiting this facet of the two, we clubbed their tumoricidal characteristics and designed curcumin loaded Se nanoparticles (Se-CurNPs) to achieve an enhanced therapeutic effect. We evaluated their therapeutic effects on different cancer cell lines and Ehrlich's ascites carcinoma mouse model. In vitro results showed that Se-CurNPs were most effective on colorectal carcinoma cells (HCT116) compared to the other cancer cell lines used and possessed pleiotropic anticancer effects...
May 9, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28477001/bacteriogenic-synthesis-of-selenium-nanoparticles-by-escherichia-coli-atcc-35218-and-its-structural-characterisation
#13
Aruna Jyothi Kora, Lori Rastogi
A biosynthetic method for the production of selenium nanoparticles under ambient temperature and pressure from sodium selenite was developed using Gram-negative bacterial strain Escherichia coli ATCC 35218. Bacteriogenic nanoparticles were methodologically characterized employing UV-vis, XRD, Raman spectroscopy, SEM, TEM, DLS and FTIR techniques. Generation of nanoparticles was visualized from the appearance of red colour in the selenite supplemented culture medium and broad absorption bands in the UV-vis. Biofabricated nanoparticles were spherical, polydisperse, ranged from 100-183 nm and the average particle size was about 155 nm...
March 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28476005/toxicological-implications-of-selenium-nanoparticles-with-different-coatings-along-with-se-4-on-lemna-minor
#14
Roshanak Tarrahi, Alireza Khataee, Ali Movafeghi, Farkhondeh Rezanejad, Gholamreza Gohari
Nanoparticles have potential high risks for living organisms in the environment due to their specific qualities and their easy access. In the present study, selenium nanoparticles (Se NPs) with two different coatings (l-cysteine and tannic acid) were synthesized. The characteristics of particles were analyzed using XRD, FT-IR and SEM. The impact of the nanoparticles besides Se(4+), on the aquatic higher plant Lemna minor was evaluated and compared. Entrance of l-cysteine and tannic acid capped Se NPs in the roots of Lemna minor was proved by TEM and fluorescence microscopy...
April 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/28463572/nanoparticles-as-potential-clinical-therapeutic-agents-in-alzheimer-s-disease-focus-on-selenium-nanoparticles
#15
Mustafa Nazıroğlu, Salina Muhamad, Laszlo Pecze
In etiology of Alzheimer's disease (AD), involvement of amyloid β (Aβ) plaque accumulation and oxidative stress in the brain have important roles. Several nanoparticles such as titanium dioxide, silica dioxide, silver and zinc oxide have been experimentally using for treatment of neurological disease. In the last decade, there has been a great interest on combination of antioxidant bioactive compounds such as selenium (Se) and flavonoids with the oxidant nanoparticles in AD. We evaluated the most current data available on the physiological effects of oxidant and antioxidant nanoparticles...
July 2017: Expert Review of Clinical Pharmacology
https://www.readbyqxmd.com/read/28444596/response-surface-design-for-accumulation-of-selenium-by-different-lactic-acid-bacteria
#16
Jingpeng Yang, Yao Li, Li Zhang, Mingtao Fan, Xinyuan Wei
The accumulation of selenium (Se) by Lactobacillus delbrueckii ssp. bulgaricus (Lb) and Streptococcus thermophilus (St) at the different cultivation conditions, including initial pH, inoculum dose (%), and temperature (°C), was investigated in this work. Se enrichment efficiency was optimized using the Design-Expert software for response surface methodology on a basis of single-factor experiment. The antioxidant activities of Se-enriched Lactic acid bacteria (LAB) were also investigated. The qualitative analysis of Se-enriched LAB was performed by FT-IR spectra...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28440710/selenium-nanoparticles-potential-in-cancer-gene-and-drug-delivery
#17
Fiona Maiyo, Moganavelli Singh
In recent decades, colloidal selenium nanoparticles have emerged as exceptional selenium species with reported chemopreventative and therapeutic properties. This has sparked widespread interest in their use as a carrier of therapeutic agents with results displaying synergistic effects of selenium with its therapeutic cargo and improved anticancer activity. Functionalization remains a critical step in selenium nanoparticles' development for application in gene or drug delivery. In this review, we highlight recent developments in the synthesis and functionalization strategies of selenium nanoparticles used in cancer drug and gene delivery systems...
May 2017: Nanomedicine
https://www.readbyqxmd.com/read/28406025/biogenic-nanoselenium-particles-effectively-attenuate-oxidative-stress-induced-intestinal-epithelial-barrier-injury-by-activating-the-nrf2-antioxidant-pathway
#18
Deguang Song, Yuanzhi Cheng, Xiaoxiao Li, Fengqin Wang, Zeqing Lu, Xiao Xiao, Yizhen Wang
In the present study, a new form of selenium nanoparticle (biogenic nanoselenium (BNS) particles) was synthesized using bacteria. The protection of BNS particles against oxidative stress-induced intestinal barrier dysfunction and the inherent mechanisms of this process were investigated, and selenomethionine (SeMet) and chemically synthesized nanoselenium (Nano-Se) particles were used for comparison. Characterization of BNS particles revealed that they were monodispersed and homogeneous spheres, with an average size of 139...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28386534/scaffold-of-selenium-nanovectors-and-honey-phytochemicals-for-inhibition-of-pseudomonas-aeruginosa-quorum-sensing-and-biofilm-formation
#19
Prateeksha, Braj R Singh, M Shoeb, S Sharma, A H Naqvi, Vijai K Gupta, Brahma N Singh
Honey is an excellent source of polyphenolic compounds that are effective in attenuating quorum sensing (QS), a chemical process of cell-to-cell communication system used by the opportunistic pathogen Pseudomonas aeruginosa to regulate virulence and biofilm formation. However, lower water solubility and inadequate bioavailability remains major concerns of these therapeutic polyphenols. Its therapeutic index can be improved by using nano-carrier systems to target QS signaling potently. In the present study, we fabricated a unique drug delivery system comprising selenium nanoparticles (SeNPs; non-viral vectors) and polyphenols of honey (HP) for enhancement of anti-QS activity of HP against P...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28378115/tracing-tellurium-and-its-nanostructures-in-biology
#20
REVIEW
Bijan Zare, Mohammad Nami, Ahmad-Reza Shahverdi
Tellurium (Te) is a semimetal rare element in nature. Together with oxygen, sulfur (S), and selenium (Se), Te is considered a member of chalcogen group. Over recent decades, Te applications continued to emerge in different fields including metallurgy, glass industry, electronics, and applied chemical industries. Along these lines, Te has recently attracted research attention in various fields. Though Te exists in biologic organisms such as microbes, yeast, and human body, its importance and role and some of its potential implications have long been ignored...
April 4, 2017: Biological Trace Element Research
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