Relevance of microbial extracellular polymeric substances (EPSs) - Part II: Technical aspects

2001 ◽  
Vol 43 (6) ◽  
pp. 9-16 ◽  
Author(s):  
H.-C. Flemming ◽  
J. Wingender
Keyword(s):  
Metal Ions ◽  
Extracellular Polymeric Substances ◽  
Organic Molecules ◽  
Wastewater Sludge ◽  
Resistance Change ◽  
Biotechnological Potential ◽  
Oil Drilling ◽  
Friction Resistance ◽  
Drilling Muds ◽  
Dissolution Of Minerals

Extracellular polymeric substances (EPSs) are involved in both detrimental and beneficial consequences of microbial aggregates such as biofilms, flocs and biological sludges. In biofouling, they are responsible for the increase of friction resistance, change of surface properties such as hydrophobicity, roughness, colour, etc. In biocorrosion of metals they are involved by their ability to bind metal ions. In bioweathering, they contribute by their complexing properties to the dissolution of minerals. The EPSs represent a sorption site for pollutants such as heavy metal ions and organic molecules. This can lead to a burden in wastewater sludge; on the other hand, the sorption properties can be used for water purification. Other biotechnological uses of EPS exploit their contribution to viscosity, e.g., in food, paints and oil-drilling ‘muds’; their hydrating properties are also used in cosmetics and pharmaceuticals. Furthermore, EPSs may have potential uses as biosurfactants, e.g., in tertiary oilproduction, and as biological glue. EPSs are an interesting component of all biofilm systems and still hold a large biotechnological potential.

IONIZATION OF ORGANIC MOLECULES WITH METAL IONS FORMED IN THE LASER PLASMA

2021 ◽  
Author(s):  
V. V. Filatov ◽  
S. M. Nikiforov ◽  
V. V. Zelenov ◽  
A. V. Pento ◽  
A. B. Bukharina ◽  
...  
Keyword(s):  
Metal Ions ◽  
Laser Plasma ◽  
Organic Molecules

scholarly journals A sustainable strategy for production and functionalization of nanocelluloses

2019 ◽  
Vol 91 (5) ◽  
pp. 865-874 ◽  
Author(s):  
Armando Córdova ◽  
Samson Afewerki ◽  
Rana Alimohammadzadeh ◽  
Italo Sanhueza ◽  
Cheuk-Wai Tai ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Metal Ions ◽  
Organic Acid ◽  
Surface Functionalization ◽  
Fluorescent Probes ◽  
Organic Molecules ◽  
Cross Coupling ◽  
Palladium Nanoparticle ◽  
Acid Catalyzed ◽  
Nanoparticle Catalyst

Abstract A sustainable strategy for the neat production and surface functionalization of nanocellulose from wood pulp is disclosed. It is based on the combination of organocatalysis and click chemistry (“organoclick” chemistry) and starts with nanocellulose production by organic acid catalyzed hydrolysis and esterification of the pulp under neat conditions followed by homogenization. This nanocellulose fabrication route is scalable, reduces energy consumption and the organic acid can be efficiently recycled. Next, the surface is catalytically engineered by “organoclick” chemistry, which allows for selective and versatile attachment of different organic molecules (e.g. fluorescent probes, catalyst and pharmaceuticals). It also enables binding of metal ions and nanoparticles. This was exemplified by the fabrication of a heterogeneous nanocellulose-palladium nanoparticle catalyst, which is used for Suzuki cross-coupling transformations in water. The disclosed surface functionalization methodology is broad in scope and applicable to different nanocelluloses and cellulose based materials as well.

scholarly journals The Biological methods of selenium nanoparticles synthesis, their characteristics and properties

2020 ◽  
pp. 6-20
Author(s):  
O. Tsehmistrenko
Keyword(s):  
Metal Ions ◽  
Green Synthesis ◽  
Alternative Energy ◽  
Extracellular Polymeric Substances ◽  
Crop Yields ◽  
Production Optimization ◽  
Total Charge ◽  
Coating Agent ◽  
Synthesis Of Nanoparticles ◽  
Biological Methods

Nanotechnologies have an impact on every sphere of life, change approaches to environmental recovery, introduce new methods of disease analysis and prevention, treatment, drug delivery and gene therapy, affect the provision of environmentally friendly alternative energy sources, increase crop yields, animal and poultry productivity. Physical, chemical, biological methods of synthesis of nanoparticles, selenium in particular, their properties and the factors participating in reduction of metal ions to nanoparticles are considered. Limitations of nanoparticle synthesis inherent in the biological method (identification and isolation of bioactive fragment responsible for biomineralization of metal ions, analysis of ways to develop individual nanoparticles) and factors contributing to the intensification of nanoparticle production (optimization of pH, temperature, contact time, mixing degree) changes in the total charge of functional organic molecules on the cell wall). It has been proved that these factors affect the size, morphology, composition of nanoparticles and their efficiency during the synthesis. The model of green synthesis with the use of physicochemical means and their biomedical applications have been summarized. There are organisms used for the synthesis of NPs - terrestrial and marine bacteria, bacterial extracellular polymeric substances as bioreductants, fungi, yeast, algae, viruses, microorganisms. It has been demonstrated the biochemical ways of microorganisms in order to fight the toxicity of metals during the synthesis of nanoproducts and the factors that determine the toxicity of metals that are converted into nanoparticles (size, shape, coating agent, nanoparticle density and type of pathogen). The biological role of selenium and features of its influence on an organism in a nanoscale scale are shown. Key words: nanotechnologies, nanoselenium, bacteria, green synthesis, enzymes.

Bis{phenyl[di(methoxyethyloxy)phosphoryl]methyl}amine as a new ligand for metal ions and cationic organic molecules

2011 ◽  
Vol 991 (1-3) ◽  
pp. 18-23 ◽  
Author(s):  
Piotr Młynarz ◽  
Tomasz Ptak ◽  
Anna Czernicka ◽  
Radosław Pankiewicz ◽  
Karolina Gluza ◽  
...  
Keyword(s):  
Metal Ions ◽  
Organic Molecules ◽  
Methyl Amine

Fabricating a super stable luminescent chemosensor with multi-stimuli-response to metal ions and small organic molecules through turn-on and turn-off effects

2017 ◽  
Vol 5 (18) ◽  
pp. 4511-4519 ◽  
Author(s):  
Yan Yang ◽  
Lian Chen ◽  
Feilong Jiang ◽  
Xiuyan Wan ◽  
Muxin Yu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Organic Molecules ◽  
Stimuli Responsive ◽  
Small Organic Molecules ◽  
Turn On ◽  
Stimuli Response

A multi-stimuli-responsive luminescent Ln-MOF (1), with a combination of exceptionally high thermal, air and chemical stabilities, as a turn-on/turn-off chemosensor for metal ions and small organic molecules is reported.

scholarly journals Insights into the production of extracellular polymeric substances of Cupriavidus pauculus 1490 under the stimulation of heavy metal ions

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 20385-20394
Author(s):  
Weimin Zeng ◽  
Shishi Zhang ◽  
Mingchen Xia ◽  
Xueling Wu ◽  
Guanzhou Qiu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Extracellular Polymeric Substances ◽  
Cupriavidus Pauculus ◽  
Stimulation Of

Metal ions are shown to stimulate the secretion of EPS components of Cupriavidus pauculus 1490, especially Cd(II).

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