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https://www.readbyqxmd.com/read/27908405/biosynthesis-of-selenium-nanoparticles-using-enterococcus-faecalis-and-evaluation-of-their-antibacterial-activities
#1
Sara Shoeibi, Mohammad Mashreghi
Microorganisms are capable of synthesizing metal nanoparticles, and specifically Enterococcus faecalis bacteria were tested for its ability to synthesize selenium nanoparticles (Se-NPs) from sodium selenite. The biosynthesized Se-NPs were spherical in shape with the size range of 29-195nm. Also, the TEM microscopy showed the accumulation of nano-structures as extracellular deposits. The ability of the bacteria to tolerate high levels of toxic selenite was studied by changing with different concentrations of sodium selenite (0...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27908256/a-review-on-nano-antimicrobials-metal-nanoparticles-methods-and-mechanisms
#2
Edris Hoseinzadeh, Pouran Makhdoumi, Parisa Taha, John Stelling, Hooshyar Hossini, Mohammad Amjad Kamal, Ghulam Md Ashraf
Nanotechnology is a scientific and engineering technology conducted at the Nano-scale, such as in the fields of compound fabric manufacturing, food processing, agricultural processing, and engineering, as well as in medical and medicinal application. In recent decade, nanomaterial applications for antimicrobial works have been interested by many researchers. Available reports show that some of the metal oxide Nanoparticles including; Al2O3, TiO2, ZnO, CuO, Co3O4, In2O3, MgO, SiO2, ZrO2, Cr2O3, Ni2O3, Mn2O3, CoO, and Nickel oxide have toxicity toward several microorganisms and they could successfully kill numerous bacteria...
December 1, 2016: Current Drug Metabolism
https://www.readbyqxmd.com/read/27866609/efficient-continuous-biosynthesis-of-silver-nanoparticles-by-activated-sludge-micromycetes-with-enhanced-tolerance-to-metal-ion-toxicity
#3
Dmitry V Tyupa, Sergei V Kalenov, Marina M Baurina, Liubov M Yakubovich, Alexander N Morozov, Ruslan M Zakalyukin, Vladimir V Sorokin, Dmitry A Skladnev
The method for producing AgNPs by granules of activated sludge micromycetes with enhanced tolerance to metal ion toxicity - Penicillium glabrum, Fusarium nivale and Fusarium oxysporum has been developed; the optimum conditions for AgNP biosynthesis being found: the Ag(+) ion concentration, duration of the contact of microbial cells with silver ions, a growth phase of microorganisms, medium composition, a рН value, mixing conditions, and also lighting intensity. The effect of Cl(-), SO4(2-) and HPO4(2-) ions binding Ag(+) ions was eliminated, that brought to significant increase of the yield of NPs...
December 2016: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27866607/synthesis-of-silver-nanoparticles-by-endosymbiont-pseudomonas-fluorescens-ca-417-and-their-bactericidal-activity
#4
Baker Syed, Nagendra Prasad M N, Dhananjaya B L, Mohan Kumar K, Yallappa S, Satish S
The present study emphasizes on biogenic synthesis of silver nanoparticles and their bactericidal activity against human and phytopathogens. Nanoparticle synthesis was performed using endosymbiont Pseudomonas fluorescens CA 417 inhabiting Coffea arabica L. Synthesized nanoparticles were characterized using hyphenated spectroscopic techniques such as UV-vis spectroscopy which revealed maximum absorption 425nm. Fourier transform infrared spectroscopy (FTIR) analysis revealed the possible functional groups mediating and stabilizing silver nanoparticles with predominant peaks occurring at 3346 corresponding to hydroxyl group, 1635 corresponding carbonyl group and 680 to aromatic group...
December 2016: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27818053/biosensors-for-plant-pathogen-detection
#5
Mohga Khater, Alfredo de la Escosura-Muñiz, Arben Merkoçi
Infectious plant diseases are caused by pathogenic microorganisms such as fungi, bacteria, viruses, viroids, phytoplasma and nematodes. Worldwide, plant pathogen infections are among main factors limiting crop productivity and increasing economic losses. Plant pathogen detection is important as first step to manage a plant disease in greenhouses, field conditions and at the country boarders. Current immunological techniques used to detect pathogens in plant include enzyme-linked immunosorbent assays (ELISA) and direct tissue blot immunoassays (DTBIA)...
September 28, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27679615/antimicrobial-activity-and-mechanism-of-inhibition-of-silver-nanoparticles-against-extreme-halophilic-archaea
#6
Rebecca S Thombre, Vinaya Shinde, Elvina Thaiparambil, Samruddhi Zende, Sourabh Mehta
Haloarchaea are salt-loving halophilic microorganisms that inhabit marine environments, sea water, salterns, and lakes. The resistance of haloarchaea to physical extremities that challenge organismic survival is ubiquitous. Metal and antibiotic resistance of haloarchaea has been on an upsurge due to the exposure of these organisms to metal sinks and drug resistance genes augmented in their natural habitats due to anthropogenic activities and environmental pollution. The efficacy of silver nanoparticles (SNPs) as a potent and broad spectrum inhibitory agent is known, however, there are no reports on the inhibitory activity of SNPs against haloarchaea...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27672437/preparation-and-characterization-of-photoactive-antimicrobial-graphitic-carbon-nitride-g-c3n4-films
#7
John H Thurston, Necia M Hunter, Kenneth A Cornell
Photoactive films derived from nanostructured samples of metal-free, intermediate band gap semiconductor graphitic carbon nitride (ns-g-C3N4) have been synthesized and characterized for their particle properties and antimicrobial activity. Physical characterization reveals that these materials are composed of discrete nanoparticles whose dimensions range from 200 nm to 700 nm. Investigation of the photochemical reactivity of ns-g-C3N4 using coumarin-3-carboxylic acid (3-CCA) indicates that this material produces reactive oxygen species (ROS) under visible radiation...
2016: RSC Advances
https://www.readbyqxmd.com/read/27652264/biosynthesis-and-characterization-of-silver-nanoparticles-by-aspergillus-species
#8
Kamiar Zomorodian, Seyedmohammad Pourshahid, Arman Sadatsharifi, Pouyan Mehryar, Keyvan Pakshir, Mohammad Javad Rahimi, Ali Arabi Monfared
Currently, researchers turn to natural processes such as using biological microorganisms in order to develop reliable and ecofriendly methods for the synthesis of metallic nanoparticles. In this study, we have investigated extracellular biosynthesis of silver nanoparticles using four Aspergillus species including A. fumigatus, A. clavatus, A. niger, and A. flavus. We have also analyzed nitrate reductase activity in the studied species in order to determine the probable role of this enzyme in the biosynthesis of silver nanoparticles...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27630128/reduction-of-selenite-to-se-0-nanoparticles-by-filamentous-bacterium-streptomyces-sp-es2-5-isolated-from-a-selenium-mining-soil
#9
Yuanqing Tan, Rong Yao, Rui Wang, Dan Wang, Gejiao Wang, Shixue Zheng
BACKGROUND: Selenium (Se) is an essential trace element in living systems. Microorganisms play a pivotal role in the selenium cycle both in life and in environment. Different bacterial strains are able to reduce Se(IV) (selenite) and (or) Se(VI) (selenate) to less toxic Se(0) with the formation of Se nanoparticles (SeNPs). The biogenic SeNPs have exhibited promising application prospects in medicine, biosensors and environmental remediation. These microorganisms might be explored as potential biofactories for synthesis of metal(loid) nanoparticles...
2016: Microbial Cell Factories
https://www.readbyqxmd.com/read/27612841/copper-polymer-nanocomposites-an-excellent-and-cost-effective-biocide-for-use-on-antibacterial-surfaces
#10
REVIEW
Laura Tamayo, Manuel Azócar, Marcelo Kogan, Ana Riveros, Maritza Páez
The development of polymer nanocomposites with antimicrobial properties has been a key factor for controlling or inhibiting the growth of microorganisms and preventing foodborne diseases and nosocomial infections. Commercially available antibacterial products based on silver-polymer are the most widely used despite the fact that copper is considerably less expensive. The incorporation of copper nanoparticles as antibacterial agents in polymeric matrices to generate copper-polymer nanocomposites have presented excellent results in inhibiting the growth of a broad spectrum of microorganisms...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27494311/influence-of-silver-nanoparticles-on-heavy-metals-of-pore-water-in-contaminated-river-sediments
#11
Wei Tao, Guiqiu Chen, Guangming Zeng, Ming Yan, Anwei Chen, Zhi Guo, Zhenzhen Huang, Kai He, Liang Hu, Lichao Wang
Despite the increasing knowledge on the discharge of silver nanoparticles (AgNPs) into the environment and their potential toxicity to microorganisms, the interaction of AgNPs with heavy metals remains poorly understood. This study focused on the effect of AgNPs on heavy metal concentration and form in sediment contaminated with heavy metals from the Xiangjiang River. The results showed that the concentration of Cu, Zn, Pb and Cd decreased and then increased with a change in form. The changes in form and concentrations of heavy metals in pore water suggested that Cu and Zn were more likely to be affected compared to Pb and Cd...
November 2016: Chemosphere
https://www.readbyqxmd.com/read/27476478/maldi-tof-mass-spectrometry-analysis-of-proteins-and-lipids-in-escherichia-coli-exposed-to-copper-ions-and-nanoparticles
#12
C D Calvano, R A Picca, E Bonerba, G Tantillo, N Cioffi, F Palmisano
Escherichia coli (E. coli) is one of the most important foodborne pathogens to the food industry responsible for diseases as bloody diarrhea, hemorrhagic colitis and life-threatening hemolytic-uremic syndrome. For controlling and eliminating E. coli, metal nano-antimicrobials (NAMs) are frequently used as bioactive systems for applications in food treatments. Most NAMs provide controlled release of metal ions, eventually slowing down or completely inhibiting the growth of undesired microorganisms. Nonetheless, their antimicrobial action is not totally unraveled and is strongly dependent on metal properties and environmental conditions...
September 2016: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/27433711/microbially-mediated-precipitation-of-calcium-carbonate-nanoparticles
#13
Ser Ku Kang, Yul Roh
The objective of this study was to investigate the biomineralization of carbonate minerals using microorganisms (Wu Do-1) enriched from rhodoliths. A 16S rRNA sequence analysis showed that Wu Do-1 mainly contained Proteus mirabilis. The pH decreased from 6.5 to 5.3 over the first 4 days of incubation due to microbial oxidation of organic acids, after which it increased to 7.8 over the remaining incubation period. XRD analysis showed that the precipitates were Mg-rich cal- cite (MgxCa(1-x)CO3), whereas no precipitates were formed without the addition of Wu Do-1 in D-1 medium...
February 2016: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/27394010/photocatalytic-and-antibacterial-response-of-biosynthesized-gold-nanoparticles
#14
Arif Ullah Khan, Qipeng Yuan, Yun Wei, Gul Majid Khan, Zia Ul Haq Khan, Shafiullah Khan, Farman Ali, Kamran Tahir, Aftab Ahmad, Faheem Ullah Khan
Increase in the bacterial resistance to available antibiotics and water contamination by different toxic organic dyes are both severe problems throughout the world. To overcome these concerns, new methodologies including synthesis of nontoxic, human friendly and efficient nanoparticles is required. These nanoparticles not even inhibit the growth of microorganisms but are also effective in the degradation of toxic organics in waste water thus providing a clean and human friendly environment. The use of plants extracts to synthesize and stabilize noble metal nanoparticles have been considered as safe, cost-effective, eco-benign and green approach nowadays...
September 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27355939/nanoparticles-alternatives-against-drug-resistant-pathogenic-microbes
#15
REVIEW
Gudepalya Renukaiah Rudramurthy, Mallappa Kumara Swamy, Uma Rani Sinniah, Ali Ghasemzadeh
Antimicrobial substances may be synthetic, semisynthetic, or of natural origin (i.e., from plants and animals). Antimicrobials are considered "miracle drugs" and can determine if an infected patient/animal recovers or dies. However, the misuse of antimicrobials has led to the development of multi-drug-resistant bacteria, which is one of the greatest challenges for healthcare practitioners and is a significant global threat. The major concern with the development of antimicrobial resistance is the spread of resistant organisms...
2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27335737/antibacterial-activity-of-silver-nanoparticles-obtained-by-pulsed-laser-ablation-in-pure-water-and-in-chloride-solution
#16
Brunella Perito, Emilia Giorgetti, Paolo Marsili, Maurizio Muniz-Miranda
Silver nanoparticles (AgNPs) have increasingly gained importance as antibacterial agents with applications in several fields due to their strong, broad-range antimicrobial properties. AgNP synthesis by pulsed laser ablation in liquid (PLAL) permits the preparation of stable Ag colloids in pure solvents without capping or stabilizing agents, producing AgNPs more suitable for biomedical applications than those prepared with common, wet chemical preparation techniques. To date, only a few investigations into the antimicrobial effect of AgNPs produced by PLAL have been performed...
2016: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/27218302/bioreduction-of-precious-metals-by-microorganism-efficient-gold-n-doped-carbon-electrocatalysts-for-the-hydrogen-evolution-reaction
#17
Weijia Zhou, Tanli Xiong, Chaohong Shi, Jian Zhou, Kai Zhou, Nengwu Zhu, Ligui Li, Zhenghua Tang, Shaowei Chen
The uptake of precious metals from electronic waste is of environmental significance and potential commercial value. A facile bioreductive synthesis is described for Au nanoparticles (ca. 20 nm) supported on N-doped carbon (Au@NC), which was derived from Au/Pycnoporus sanguineus cells. The interface and charge transport between Au and N-doped carbon were confirmed by HRTEM and XPS. Au@NC was employed as an electrocatalyst for the hydrogen evolution reaction (HER), exhibiting a small onset potential of -54...
July 11, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27166174/effects-of-metal-nanoparticles-on-methane-production-from-waste-activated-sludge-and-microorganism-community-shift-in-anaerobic-granular-sludge
#18
Tao Wang, Dong Zhang, Lingling Dai, Yinguang Chen, Xiaohu Dai
Extensive use of nanoparticles (NPs) in consumer and industrial products has led to concerns about their potential environmental impacts; however, the influences of different NPs (e.g., nZVI (nano zero-valent iron), Ag NPs, Fe2O3 NPs and MgO NPs) on the anaerobic digestion of sludge have not yet been studied in depth. Additionally, a new guideline or the use of different NPs in the anaerobic digestion of sludge should be established to improve the anaerobic digestion of sludge and avoid inhibitory effects. This study investigated the effects of four representative NPs (i...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27157896/microorganism-mediated-biosynthesis-of-metal-chalcogenides-a-powerful-tool-to-transform-toxic-effluents-into-functional-nanomaterials
#19
M Paula Vena, Matías Jobbágy, Sara A Bilmes
Cadmium contained in soil and water can be taken up by certain crops and aquatic organisms and accumulate in the food-chain, thus removal of Cd from mining or industrial effluents - i.e. Ni-Cd batteries, electroplating, pigments, fertilizers - becomes mandatory for human health. In parallel, there is an increased interest in the production of luminescent Q-dots for applications in bioimaging, sensors and electronic devices, even the present synthesis methods are economic and environmentally costly. An alternative green pathway for producing Metal chalcogenides (MC: CdS, CdSe, CdTe) nanocrystals is based on the metabolic activity of living organisms...
September 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27154202/biological-synthesis-of-fluorescent-nanoparticles-by-cadmium-and-tellurite-resistant-antarctic-bacteria-exploring-novel-natural-nanofactories
#20
D O Plaza, C Gallardo, Y D Straub, D Bravo, J M Pérez-Donoso
BACKGROUND: Fluorescent nanoparticles or quantum dots (QDs) have been intensely studied for basic and applied research due to their unique size-dependent properties. There is an increasing interest in developing ecofriendly methods to synthesize these nanoparticles since they improve biocompatibility and avoid the generation of toxic byproducts. The use of biological systems, particularly prokaryotes, has emerged as a promising alternative. Recent studies indicate that QDs biosynthesis is related to factors such as cellular redox status and antioxidant defenses...
2016: Microbial Cell Factories
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