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Silver AND Nanoparticles

Meng Jiang, Yun Qi, Huan Liu, Yinguang Chen
Nanomaterials and nanotechnologies (NNs) have been shaping the wastewater treatment process unprecedentedly. Bibliometric methods are regarded as an indispensable light to guide direction in scientific domain. The present study aims to investigate the role of NNs in wastewater treatment with bibliometric techniques based on SCI databases from 1997 to 2016. Results showed that China (962), USA (324) and Iran (140) are the most productive countries. Chinese Academy of Sciences (149), Tongji University (49), and Harbin Institute of Technology (40) from China are the most contributive institutions...
August 10, 2018: Nanoscale Research Letters
Anchu Ashok, Anand Kumar, Faris Tarlochan
Herein, we report the synthesis of silver-cobalt nanopowders using three different modes of solution combustion synthesis, and we present the effects of the synthesis conditions on particle morphology. The synthesized nanoparticles were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), UV-Visible spectrophotometer (UV-vis), Transmission electron microscopy (TEM), and X-Ray Photoelectron Spectroscopy (XPS) to understand the structural and elemental properties...
August 9, 2018: Nanomaterials
Shalv Amit Parekh, Rebecca Nicole David, Kranthi K R Bannuru, Lakshminarasimhan Krishnaswamy, Avinash Baji
The scarcity of drinking water and the contamination of water sources in underdeveloped countries are serious problems that require immediate low-tech and low-cost solutions. In this study, we fabricated polyacrylonitrile (PAN) porous membranes coated with silver nanoparticles (AgNP) and demonstrated their use for water filtration and water treatment applications. The membranes were prepared by electrospinning a PAN solution and treating in a hydroxylamine (NH₂OH) aqueous solution to form ⁻C(NH₂)N⁻OH groups that were used for functionalization (Ag⁺ ions) of the membrane...
August 8, 2018: Membranes
Tianxiang Lan, Rui An, Zheng Liu, Kaijun Li, Jun Xiang, Gongyan Liu
The stable and efficient immobilization of silver nanoparticles (AgNPs) on/into processable biomass-based macro-support with porous networks is a promising and sustainable strategy to achieve both high catalytic activity and excellent reusability for heterogeneous catalysis. In this work, a collagenic composite film was facilely fabricated at room temperature, via the self-assembly of natural collagen fibers (CFs) and gallic acid modified silver nanoparticles (GA@AgNPs) induced by chromium (III) cross-linking in water...
July 31, 2018: Journal of Colloid and Interface Science
Kamil Brzóska, Iwona Grądzka, Marcin Kruszewski
Metallic nanomaterials are utilized in an increasing number of applications in medicine and industry. Their general toxicity was tested in numerous reports both in vitro and in vivo but limited data exist on how nanomaterials affect the activity of cellular signaling pathways activated by growth factors and cytokines. The aim of the present work was to test the hypothesis predicting that silver, gold and superparamagnetic iron oxide nanoparticles may interfere with cellular signaling activated by tumor necrosis factor (TNF) and change the final cellular outcome of TNF action...
August 7, 2018: Toxicology and Applied Pharmacology
Jia Du, Junhong Tang, Shaodan Xu, Jingyuan Ge, Yuwei Dong, Huanxuan Li, Meiqing Jin
Silver nanoparticles (Ag-NPs) are increasingly being applied in many consumer products due to their unique properties. Widespread use of Ag-NPs leads to an increasing human exposure to Ag-NPs in many different pathways. This review summarized the toxicity mechanisms of Ag-NPs based on various environmentally relevant test species, such as bacteria, cells, plants, aquatic animals and mammals, in both in vitro and in vivo experiments. Nanoparticles were usually exposed to combination chemicals but to single chemicals in the environment and thereby exert combined toxicities to the organisms...
August 7, 2018: Regulatory Toxicology and Pharmacology: RTP
Arpit Bhargava, Vikram Pareek, Subhasree Roy Choudhury, Jitendra Panwar, Surajit Karmakar
Pseudomonas aeruginosa, a gram-negative rod-shaped bacterium is a notorious pathogen causing chronic infections. Its ability to form antibiotic resistant biofilm has raised the need for the development of alternative treatment approaches. An ideal alternate can be silver nanoparticles known for their strong yet tuneable bactericidal activity. However, their use in the commercial in vivo medicine could not see the light of the day because of the unwanted toxicity of silver in the host cells at higher concentrations...
August 10, 2018: ACS Applied Materials & Interfaces
Mubashir Hussain, Naveed Iqbal Raja, Muhammad Iqbal, Muhammad Ejaz, Sumaira Aslam, Abd-Ur Rehman, Uneeza Javaid
The biosynthesis of silver nanoparticles (AgNPs) is substantial for its applications in different fields. The Moringa oleifera leaves were used as reducing and stabilising agent for the biosynthesis of AgNPs. The synthesised AgNPs were characterised through UV-visible spectroscopy, zeta analyser, scanning electron microscopy (SEM) and energy dispersive Xray (EDX). In this study, effects of the synthesised AgNPs were also evaluated on nucellus tissues germination frequency and biochemical parameters of plant tissues...
August 2018: IET Nanobiotechnology
Razieh Azimpanah, Zahra Solati, Majid Hashemi
Silver nanoparticles (AgNPs) were prepared by a green method using Cordia myxa leaf extract. They were characterised by UV-vis spectroscopy, Fourier transform infrared spectroscopy and their X-ray diffraction pattern. Their sizes were determined by scanning electron micrographs, transmission electron micrographs imaging and dynamic light scattering analysis. The shapes of nanoparticles were spherical or truncated triangular and their average size was determined to be 51.6 nm. Their solution was stable at least for one month...
August 2018: IET Nanobiotechnology
Pınar Nartop
Nanoparticles have been used in many areas of biotechnology. In this study, an alternative surface sterilisation method was established for plant tissue cultures. Silver nanoparticles synthesised via green synthesis were used for the surface sterilisation of Lamiaceae seeds ( Salvia farinecae, Ocimum basilicum - Large Leaf Italian, Thymus vulgaris, Ocimum basilicum var. purpurascens). Water extracts of dried Alkanna tinctorum rhizomes and Syzygium aromaticum flowers were utilised in the bioreduction of silver ions...
August 2018: IET Nanobiotechnology
Manish Sharma, Parth Sarthi Nayak, Shreyasi Asthana, Dipankar Mahapatra, Manoranjan Arakha, Suman Jha
The last decade has observed a rapid advancement in utilising biological system towards bioremediation of metal ions in the form of respective metal nanostructures or microstructures. The process may also be adopted for respective metal nanoparticle biofabrication. Among different biological methods, bacteria-mediated method is gaining great attention for nanoparticle fabrication due to their eco-friendly and cost-effective process. In the present study, silver nanoparticle (AgNP) was synthesised via continuous biofabrication using Aeromonas veronii , isolated from swamp wetland of Sunderban, West Bengal, India...
August 2018: IET Nanobiotechnology
Ankit Chokriwal, Bjorn John Stephen, Devendra Jain, Abhijeet Singh
Here, extracellular synthesis of silver nanoparticles (AgNPs) was carried out by Planococcus plakortidis strain BGCC-51 isolated from dye industry effluent soil. The microbes were isolated, screened, and characterised by molecular analysis (accession number KX776160). The optimisation of synthesis of AgNPs to determine the optimum substrate level (1-5 mM), pH (5-9), and temperature (25-55°C) were further carried out. P. plakortidis strain BGCC-51 gave best yield of AgNPs at substrate concentration 5 mM, pH 8, and at 35°C...
August 2018: IET Nanobiotechnology
Parisa Ghorbani, Farideh Namvar, Masoud Homayouni-Tabrizi, Mozhgan Soltani, Ehsan Karimi, Parichehreh Yaghmaei
Currently, nanotechnology and nanoparticles (NPs) are recognised due to their extensive applications in medicine and the treatment of certain diseases, including cancer. Silver NPs (AgNPs) synthesised by environmentally friendly method exhibit a high medical potential. This study was conducted to determine the cytotoxic and apoptotic effects of AgNPs synthesised from sumac (Anacardiaceae family) fruit aqueous extract (AgSu/NPs) on human breast cancer cells (MCF-7). The anti-proliferative effect of AgSu/NPs was determined by MTT assay...
August 2018: IET Nanobiotechnology
Weidong Huang, Xueliang Fang, Hongdao Wang, Fengchan Chen, Haiming Duan, Yaling Bi, Haibing Yu
In the present study, Bipolaris maydis was used to synthesise silver nanoparticles (AgNPs). Several parameters that influence the synthesis of AgNPs such as fungus age, the concentration of Ag nitrate (AgNO3 ), and incubation time were explored to find the optimum synthesis condition. Furthermore, the antifungal activity of AgNPs against Exserohilum turcicum was determined by measuring inhibition zone diameter, colony formation, and conidia germination. The optimal biosynthesis system included fungus age of 7 days, 8 mM AgNO3 , and an incubation time of 120 h...
August 2018: IET Nanobiotechnology
Ali Reza Allafchian, Seyed Amir Hossein Jalali, Farzane Aghaei, Hamid Reza Farhang
The metal nanoparticles, due to interesting features such as electrical, optical, chemical and magnetic properties, have been investigated repeatedly. Also, the mentioned nanoparticles have specific uses in terms of their antibacterial activity. The biosynthesis method is more appropriate than the chemical method for producing the nanoparticles because it does not need any special facilities; it is also economically affordable. In the current study, the silver nanoparticles (AgNPs) were obtained by using a very simple and low-cost method via Glaucium corniculatum (L...
August 2018: IET Nanobiotechnology
Bei Qin, Kuan Yang
A sensitive electrochemical aptasensor was developed for the determination of thrombin. It is based on signal amplification by using graphene oxide (GO) decorated with silver nanoparticles (AgNP) and placed on a microelectrode. The graphene oxide decorated with silver nanoparticles (AgNP-GO) was synthesized by chemical reduction and then modified with a thrombin-binding aptamer 1 (TBA1; a 29-mer) carrying a 3'-terminal thiol group. It was immobilized on the AgNP-GO by self-assembled monolayer technique to form the signaling probe (TBA1-AgNP-GO)...
August 9, 2018: Mikrochimica Acta
Samira Yazdanparast, Ali Benvidi, Maryam Banaei, Habib Nikukar, Marzieh Dehghan Tezerjani, Mostafa Azimzadeh
This paper reports on a sensitive and selective method for the detection of Michigan Cancer Foundation-7 (MCF-7) human breast cancer cells and MUC1 biomarker by using an aptamer-based sandwich assay. A biocompatible nanocomposite consisting of multiwall carbon nanotubes (MWCNT) and poly(glutamic acid) is placed on a glassy carbon electrode (GCE). The sandwich assay relies on the use of a mucin 1 (MUC1)-binding aptamer that is first immobilized on the surface of modified GCE. Another aptamer (labeled with silver nanoparticles) is applied for secondary recognition of MCF-7 cells in order to increase selectivity and produce an amplified signal...
August 9, 2018: Mikrochimica Acta
Luzia V Modolo, Cristiane J da-Silva, Débora S Brandão, Izabel S Chaves
World population is expected to reach 9.7 billion by 2050, which makes a great challenge the achievement of food security. The use of urease inhibitors in agricultural practices has long been explored as one of the strategies to guarantee food supply in enough amounts. This is due to the fact that urea, one of the most used nitrogen (N) fertilizers worldwide, rapidly undergoes urease-driven hydrolysis on soil surface yielding up to 70% N losses to environment. This review provides with a compilation of what has been done since 2005 with respect to the search for good urease inhibitors of agricultural interests...
September 2018: Journal of Advanced Research
Mihai Flaviu Şuhani, Grigore Băciuţ, Mihaela Băciuţ, Raluca Şuhani, Simion Bran
Introduction: The key idea of nanotechnology is to construct and preserve functional structures by means of exploiting atoms and molecules. Nanotechnology has proven to be crucial in pharmacological medicine, tissue engineering, clinical diagnosis, long term conservation of biological tissues in a cryogenic state, protein detection, tumor destruction and magnetic resonance imaging.The aim of this paper is to review the literature on the specific characteristics of nanostructured materials, their applications and advantages that they bring to dentistry...
July 2018: Clujul Medical (1957)
A A Aly, A Abou-Okeil, H M Fahmy
A water soluble, non-gel, poly (N-vinyl-2-pyrrolidone)/κ-carrageenan (PVP/KC) hybrid was synthesized by graft copolymerization of N-vinylpyrrolidone (VP) onto κ-carrageenan in an aqueous medium using ammonium persulphate (APS) as an initiator. Factors affecting the polymerization reaction such as ammonium persulfate concentration, reaction temperature and time, liquor to KC ratio (LR) and KC to VP molar ratio were studied. The results obtained revealed that the optimum reaction polymerization conditions to prepare that hybrid with a total conversion of 93...
October 15, 2018: Carbohydrate Polymers
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