Development of Environmentally-friendly Molecular Transformation System Based on Cooperative Catalysis between Metal Nanoparticles and Inorganic Metal Oxides

2014 ◽  
Vol 72 (3) ◽  
pp. 268-279
Author(s):  
Takato Mitsudome ◽  
Kiyotomi Kaneda
Keyword(s):  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Environmentally Friendly ◽  
Transformation System ◽  
Cooperative Catalysis

Catalytic asymmetric hydrogenation reaction by in situ formed ultra-fine metal nanoparticles in live thermophilic hydrogen-producing bacteria

Nanoscale ◽  
2021 ◽  
Author(s):  
Wei Bing ◽  
Faming Wang ◽  
Yuhuan Sun ◽  
Jinsong Ren ◽  
Xiaogang Qu
Keyword(s):  
Metal Nanoparticles ◽  
Catalytic Hydrogenation ◽  
Asymmetric Hydrogenation ◽  
Environmentally Friendly ◽  
Hydrogenation Reaction ◽  
Highly Efficient ◽  
Hydrogenation Reactions ◽  
Live Bacteria ◽  
Catalytic Asymmetric Hydrogenation

An environmentally friendly biomimetic strategy has been presented and validated for the catalytic hydrogenation reaction in live bacteria. In situ formed ultra-fine metal nanoparticles can realize highly efficient asymmetric hydrogenation reactions.

Synthesis of metal nanoparticles using yeast strains Saccharomyces Cerevisae and Saccharomyces Boulardi

2021 ◽  
pp. 44-49
Author(s):  
Ekaterina A. Pukhovskaya ◽  
Egor V. Kalinin ◽  
Ya. M. Stanishevskiy
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Extracellular Enzymes ◽  
Biological Systems ◽  
Environmentally Friendly ◽  
Synthesis Of Nanoparticles ◽  
Yeast Strains ◽  
Environmentally Friendly Process

The development of an environmentally friendly process for the synthesis of metal nanoparticles is an important step in the field of nanotechnology. One way to achieve this goal is to use biological systems. In this study, silver nanoparticles were obtained using extracellular enzymes of organisms of the Saccharomyces boulardi strain. The effect of the pH of the medium on the synthesis of nanoparticles was studied. The antimicrobial activity of the obtained nanoparticles was investigated.

scholarly journals Analysis of the Exposure of Organisms to the Action of Nanomaterials

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 349 ◽  
Author(s):  
Anita Staroń ◽  
Olga Długosz ◽  
Jolanta Pulit-Prociak ◽  
Marcin Banach
Keyword(s):  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Public Awareness ◽  
Rapid Development ◽  
Careful Analysis ◽  
In Vitro Tests ◽  
Nanoparticle Interactions ◽  
The Impact

The rapid development of the production of materials containing metal nanoparticles and metal oxides is a potential risk to the environment. The degree of exposure of organisms to nanoparticles increases from year to year, and its effects are not fully known. This is due to the fact that the range of nanoparticle interactions on cells, tissues and the environment requires careful analysis. It is necessary to develop methods for testing the properties of nanomaterials and the mechanisms of their impact on individual cells as well as on entire organisms. The particular need to raise public awareness of the main sources of exposure to nanoparticles should also be highlighted. This paper presents the main sources and possible routes of exposure to metal nanoparticles and metal oxides. Key elements of research on the impact of nanoparticles on organisms, that is, in vitro tests, in vivo tests and methods of detection of nanoparticles in organisms, are presented.

scholarly journals Supported rhenium nanoparticle catalysts for acceptorless dehydrogenation of alcohols: structure–activity relationship and mechanistic studies

2016 ◽  
Vol 6 (15) ◽  
pp. 5864-5870 ◽  
Author(s):  
Kenichi Kon ◽  
Wataru Onodera ◽  
Takashi Toyao ◽  
Ken-ichi Shimizu
Keyword(s):  
Metal Nanoparticles ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Mechanistic Studies ◽  
Acid Base ◽  
Title Reaction ◽  
Nanoparticle Catalysts ◽  
Cooperative Catalysis ◽  
Structure Activity

Mechanistic and structure–activity relationship studies show cooperative catalysis of Re0 sites on the supported Re metal nanoparticles and acid–base sites of alumina for the title reaction.

scholarly journals Biocompatible Metal-Oxide Nanoparticles: Nanotechnology Improvement of Conventional Prosthetic Acrylic Resins

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Laura S. Acosta-Torres ◽  
Luz M. López-Marín ◽  
R. Elvira Núñez-Anita ◽  
Genoveva Hernández-Padrón ◽  
Victor M. Castaño
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Suspension Polymerization ◽  
Metal Oxide Nanoparticles ◽  
Physicochemical Characterization ◽  
Dental Restoration ◽  
Oxide Nanoparticles ◽  
Dental Resins ◽  
Acrylic Resins

Nowadays, most products for dental restoration are produced from acrylic resins based on heat-cured Poly(Methyl MethAcrylate) (PMMA). The addition of metal nanoparticles to organic materials is known to increase the surface hydrophobicity and to reduce adherence to biomolecules. This paper describes the use of nanostructured materials, TiO2and Fe2O3, for simultaneously coloring and/or improving the antimicrobial properties of PMMA resins. Nanoparticles of metal oxides were included during suspension polymerization to produce hybrid metal oxides-alginate-containing PMMA. Metal oxide nanoparticles were characterized by dynamic light scattering, and X-ray diffraction. Physicochemical characterization of synthesized resins was assessed by a combination of spectroscopy, scanning electron microscopy, viscometry, porosity, and mechanical tests. Adherence ofCandida albicanscells and cellular compatibility assays were performed to explore biocompatibility and microbial adhesion of standard and novel materials. Our results show that introduction of biocompatible metal nanoparticles is a suitable means for the improvement of conventional acrylic dental resins.

scholarly journals Nanoparticles as Potential Antivirals in Agriculture

Agriculture ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 444
Author(s):  
Marcela Vargas-Hernandez ◽  
Israel Macias-Bobadilla ◽  
Ramon Gerardo Guevara-Gonzalez ◽  
Enrique Rico-Garcia ◽  
Rosalia Virginia Ocampo-Velazquez ◽  
...  
Keyword(s):  
Beneficial Effect ◽  
Physicochemical Properties ◽  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Mechanisms Of Action ◽  
Plant Diseases ◽  
Antiviral Property ◽  
Interaction Processes ◽  
Antiviral Effects ◽  
Wide Range

Viruses are estimated to be responsible for approximately 50% of the emerging plant diseases, which are difficult to control, and in some cases, there is no cure. It is essential to develop therapy practices to strengthen the management of these diseases caused by viruses in economically important crops. Metal nanoparticles (MeNPs) possess diverse physicochemical properties that allow for them to have a wide range of applications in industry, including nanomedicine and nano-agriculture. Currently, there are reports of favorable effects of the use of nanoparticles, such as antibacterial, antifungal, and antiviral effects, in animals and plants. The potential antiviral property of MeNPs makes them a powerful option for controlling these histological agents. It is crucial to determine the dosage of NPs, the application intervals, their effect as a biostimulant, and the clarification of the mechanisms of action, which are not fully understood. Therefore, this review focuses on discussing the ability of metal nanoparticles and metal oxides to control viruses that affect agriculture through an exhaustive analysis of the characteristics of the particles and their interaction processes for a possibly beneficial effect on plants.

A general synthesis of mesoporous metal oxides with well-dispersed metal nanoparticles via a versatile sol–gel process

2013 ◽  
Vol 1 (12) ◽  
pp. 4038 ◽  
Author(s):  
Juanjuan Liu ◽  
Shihui Zou ◽  
Sha Li ◽  
Xiaofeng Liao ◽  
Yejiang Hong ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Sol Gel ◽  
Mesoporous Metal Oxides ◽  
Sol Gel Process ◽  
Mesoporous Metal ◽  
General Synthesis

Carboxymethyl cellulose-templated synthesis of hierarchically structured metal oxides

2015 ◽  
Vol 17 (8) ◽  
pp. 4167-4172 ◽  
Author(s):  
Jong Wan Ko ◽  
Byung Il Lee ◽  
You Jung Chung ◽  
Chan Beum Park
Keyword(s):  
Metal Oxides ◽  
Carboxymethyl Cellulose ◽  
Environmentally Friendly ◽  
Porous Metal ◽  
Templated Synthesis ◽  
Sacrificial Template ◽  
Environmentally Friendly Process ◽  
Porous Metal Oxides

Cellulose-templated synthesis: Porous metal oxides were successfully synthesized through a simple and environmentally friendly process using carboxymethyl cellulose (CMC) fibers as a sacrificial template.

Recent developments of nanoenzyme-based colorimetric sensors for heavy metal detection and the interaction mechanism

The Analyst ◽  
2020 ◽  
Vol 145 (9) ◽  
pp. 3173-3187 ◽  
Author(s):  
Zhengquan Yan ◽  
Hua Yuan ◽  
Qi Zhao ◽  
Lin Xing ◽  
Xiaoyu Zheng ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Interaction Mechanism ◽  
Metal Sulfides ◽  
Heavy Metal Detection ◽  
G Quadruplex ◽  
Metal Detection ◽  
Recent Developments ◽  
Colorimetric Sensors

This work highlights the application and interaction mechanism of metal nanoparticles, metal oxides, metal sulfides, graphene-based nanomaterials and G-quadruplex, etc. in nanoenzyme-based colorimetric sensors.

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