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PubMed Journals Articles About "Little Heaps Silver Wrapped" RSS

08:34 EST 17th November 2019 | BioPortfolio

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Showing "Little Heaps Silver Wrapped" PubMed Articles 1–25 of 728

Efficient Silver Release From Ion Exchange Silver Dressings in Biologically Relevant Media.

Silver-containing wound dressings commonly are used when there is a risk of infection. These commercial antimicrobial silver dressings have various compositions that use different substrates and/or silver sources. Common silver sources are ionic silver (Ag+) and metallic silver (Ag0). A third source of silver is ion exchange silver compounds (Ag+ complex), in which silver ions are encapsulated in an inorganic carrier to moderate the availability of the silver ions and are released via an ion exchange mechan...


Safety Evaluation of Silver-ion Dressings in a Porcine Model of Deep Dermal Wounds: a GLP Study.

Silver ion has strong antimicrobial properties and is used in a number of wound dressings. In burn models, silver-nylon dressings produce elevated silver levels in the wound along with minimal systemic effect. We evaluated systemic toxicity in a non-burn wound model to see if a similar pattern of silver ion distribution would occur.

Antifungal activity of silver nanoparticles from Aspergillus niger.

In recent years, silver nanoparticles have gained attention because of their high surface area to volume ratio that makes them more advantageous than their bulky counterparts. Apart of chemical and physical methods of silver nanoparticles (AgNPs) production, green synthesis is being exploited by the researchers. Aspergillus niger are among some fungi being used in fabrication of silver nanoparticles and their antifungal activities are being studied. We have experimented using A. niger Gin for extracellular ...


Three Silver Coordination Polymers with Diverse Architectures Constructed from Pyridine Carboxylic Hydrazide Ligands.

A series of silver coordination polymers (CPs) have been synthesized through self-assembly of three pyridinecarboxylic acid hydrazide (-, -, -position) ligands with silver clusters (named Ag1-iah, Ag2-iah, and Ag3-iah). These silver CPs show different one- and two-dimensional topologies including cross-helical chains, planar network, and parallel helical chains for Ag1-iah, Ag2-iah, and Ag3-iah, respectively. The combination of experimental and computational results reveals the critical role in the space di...

Bluish-gray discoloration of skin and conjunctiva.

Colloidal silver used as a suspension for (alternative) therapeutic purposes or silver exposure due to environmental or working conditions can lead to irreversible deposits of silver granules in the skin (bluish-gray hue of the skin), mucosa, cornea, retina and internal organs. Silver-induced discoloration of the conjunctiva should therefore be taken into account when a bluish-gray discoloration raises the suspicion of conjunctival melanoma.

Solvent-triggered reversible interconversion of all-nitrogen-donor-protected silver nanoclusters and their responsive optical properties.

Surface organic ligands are critical in determining the formation and properties of atomically precise metal nanoclusters. In contrast to the conventionally used thiolate, phosphine and alkynyl ligands, the amine ligand dipyridylamine is applied here as a protecting agent in the synthesis of atomically precise metal nanoclusters. We report two homoleptic amido-protected Ag nanoclusters as examples of all-nitrogen-donor-protected metal nanoclusters: [Ag(dpa)]SbF (Ag) and [Ag(dpa)](SbF) (Ag) (dpa = dipyri...

Histopathological changes of organs (lungs, liver, kidney, brain) after using two types of AgiCoat and Acticoat nano-silver dressings on deep second-degree burn in rat.

Prevention of infections is very important issue in treating the burn wounds. The nano-silver dressings have many promising advantages, but absorption of silver ions and its side effects to the body were always a question. The aim of this study is to compare Silver serum levels and acute toxic effects of Nano-silver on histopathology of organs (lungs, liver, kidney, spleen, brain) in two types of AgiCoat and Acticoat (Nano-Silver) dressings on second-degree deep burn in rat.

Open mining pits and heaps of waste material as the source of undesirable substances: biomonitoring of air and soil pollution in former mining area (Dubnik, Slovakia).

Moss and lichen bag technique (Dicranum sp., Hypnum sp., Polytrichum sp., Hypogymnia physodes) and activity of soil enzymes (urease, acid and alkaline phosphatase, fluorescein diacetate, ß-glucosidase) were used as bioindicators of air and soil pollution in Dubník former mining area (East Slovakia). Ten open mining pits and 8 heaps of waste material were chosen for the research purposes. Contamination factor (C), degree of contamination (C), and pollution load index (PLI) were used to evaluate the level o...

Antimicrobial activity of silver salt and silver nanoparticles in different forms against microorganisms of different taxonomic groups.

The development of antiseptics and medical products (bandaging materials, sponges, etc.) based on silver nanoparticles is an essential task due to the growing resistance of pathogenic microorganisms to medicines long used in clinical practice. Using silver nanoparticles for the same purpose is promising, but the potential hazards and cumulative effects in the application of nanoparticles requires a thorough study of those materials. To evaluate the efficiency of antiseptics and medical products based on sil...

Oxidized alginate/gelatin decorated silver nanoparticles as new nanocomposite for dye adsorption.

In the current article di-aldehyde alginate (DAA) crosslinking gelatin (Ge) hydrogel was prepared and investigated for stabilizing silver nanoparticles. DAA/Ge decorated silver nanoparticles hydrogel was characterized by IR, XRD, TGA, SEM and AFM. The outcomes demonstrate that silver nanoparticles with uniform sizes were homogenously distributed through DAA/Ge hydrogel. DAA/Ge decorated silver nanocomposite was examined for the rejection of Methylene blue (MB) from aqueous solutions. Comparing with DAA/Ge h...

Reduction of silver nanoparticle toxicity affecting ammonia oxidation using cell entrapment technique.

Occurrence of silver nanoparticles (AgNPs) in wastewater treatment systems could impact the ammonia oxidation (AO). This study investigated the reduction of AgNPs and dissociated silver ion (Ag) toxicity on nitrifying sludge using cell entrapment technique. Three entrapment materials, including barium alginate (BA), polyvinyl alcohol (PVA), and a mixture of polyvinyl alcohol and barium alginate (PVA-BA), were applied. The BA beads provided the highest reduction of silver toxicity (up to 90%) and durability....

Preparation and characterization of hybrid chitosan-silver nanoparticles (Chi-Ag NPs); A potential antibacterial agent.

In this study, a novel ecofriendly chitosan- silver nanoparticles hybrid was developed. Biological method using leaf extract of T. portulacifolium was used as reducing agent for its synthesis and the antibacterial efficiency of these hybrid nanoparticles were evaluated against the bacteria E. coli and S. marcescens organisms. The intense peak observed around 419 nm in the UV-Vis indicates the formation of silver nanoparticles. The XRD analysis showed that the hybrid chitosan-silver nanoparticles have a po...

Graphene oxide nanoslits confined AgBF4/Ionic liquid for efficiently separating olefin from paraffin.

Facilitated transport membrane for separating light olefins, using transition metals like silver and copper as carriers, is promising to replace those traditional energy-consumption methods. Here, we construct ionic liquid filled the nanoslits of laminated graphene oxide membrane with silver ions as carrier to separate ethylene/ethane. The nanoslits of graphene oxide membrane efficiently prevents the loss of silver ions ionic liquid solution. The ionic liquid further slows down the reduction of silver ions....

Optimization for silver remediation from aqueous solution by novel bacterial isolates using response surface methodology: Recovery and characterization of biogenic AgNPs.

Silver is a toxic but precious heavy metal that has been implemented in diverse biomedical and environmental sectors. Extensive use of this metal has provoked severe environmental concerns. Hence there is an increasing demand for the development of a simple, inexpensive and eco-friendly approach for the remediation and recovery of silver. In this study, novel bacterial strains Enterobacter cloacae SMP1, Cupriavidus necator SMP2, and Bacillus megaterium SMP3 were isolated from silver mining site for the sake...

Wrapped Up in Shame.

CeO promoted Ag/TiO catalyst for soot oxidation with improved active oxygen generation and delivery abilities.

To evaluate the usability of TiO support for silver in soot oxidation, Ag/TiO and Ag/CeO catalysts were prepared and soot oxidation experiment was performed. The catalytic activity of silver was more enhanced on P25 and rutile than on anatase and CeO in tight contact, as evidenced from comparing the activities of supports and silver impregnated catalysts. The reasons for the difference in active metal enhancement were elucidated by various characterization methods (TEM, H TPR, and XPS), and it is verified t...

DNA Integration with Silver and Gold Nanoparticles. Enhancement of DNA Optical Anisotropy.

DNA integration with silver and gold nanoparticles was carried out by the chemical reduction of silver and gold ions after formation of their complexes with high molecular DNA in solution. It is shown that for a good association of DNA with nanoparticles, the ions of silver and gold should be linked with DNA bases rather strongly. The proposed model of gold interaction with DNA is the coordination of gold to N7 guanine in a major groove, followed by the transformation of the GC pair to Hoogsteen's type pair...

Cooperative Silver Ion-Pair Recognition by Peralkylated Pillar5arenes.

Ion-pair recognition of metal salts by pillararenes has never been reported. This limits the further development and applications of pillararene supramolecular chemistry. Herein we report the first examples of pillararene-based metal ion-pair recognition. They are host-guest complexes between three peralkylated pillar[5]arenes and the silver salt CF3COOAg. Single crystal X-ray analysis shows that CF3COOAg forms a unique dinuclear silver structure that penetrates into the pillar[5]arene cavity in these compl...

Effects of silver nitrate are a conservative estimate for the effects of silver nanoparticles on algae growth and Daphnia magna reproduction.

Silver (Ag) salts have been shown to be highly toxic to freshwater organisms. There is nevertheless still a high level of uncertainty on the aquatic effects of Ag nanoparticles ('nanoAg'), and how these relate to effects of soluble Ag-salts. As part of the REACH Substance Evaluation for Ag, new data were generated to justify read-across from soluble Ag-salts to nanoAg. The aquatic toxicity to algae growth and Daphnia magna reproduction and fate and behavior of AgNO versus the nanoAg were tested and compared...

Noble copper-silver-gold trimetallic nanobowls: An efficient catalyst.

We demonstrated the design of tiny bowls of copper-silver-gold (Cu-Ag-Au) alloy type noble trimetallic nanocrystals with a unique shape. All the structural characterizations confirm the presence of copper (Cu), silver (Ag), and gold (Au) in the trimetallic nanobowls. Finally, we examined the catalytic efficiency of trimetallic Cu-Ag-Au nanobowls for reduction of 4-nitrophenol to 4-aminophenol and found that these nanobowls were 14, 23 and 43-fold more active than each of the constituent metals, Au, Cu and A...

Cytotoxic effects of silver diamine fluoride.

To investigate the effect of silver diamine fluoride (SDF) and fluoride varnish (FV) on human gingival fibroblasts (HGF) and bacteria.

Facile synthesis of reduced graphene oxide-wrapped CNFs with controllable chemical reduction degree for enhanced microwave absorption performance.

The rGO-wrapped nanocomposites can be regarded as promising candidates for the development of advanced microwave absorbing materials. In this work, hierarchical rGO-wrapped CNFs were prepared via a two-step strategy, including a classical modified Hummers method and a green reduction reaction. Accompany with the chemical treatments, graphene oxide appears on the outer walls of carbon nanofibers. By modulating the addition amount of ascorbic acid, the outer graphene oxide can be controllably reduced. Moreove...

Gonad development and reproductive hormones of invasive silver carp (Hypophthalmichthys molitrix) in the Illinois River.

Reproduction is a major component of an animal's life history strategy. Species with plasticity in their reproductive biology are likely to be successful as an invasive species, as they can adapt their reproductive effort during various phases of a biological invasion. Silver carp (Hypophthalmicthys molitrix), an invasive cyprinid in North America, display wide variation in reproductive strategies across both their native and introduced ranges, though the specifics of silver carp reproduction in the Illinoi...

Silver nanoparticles exert concentration-dependent influences on biofilm development and architecture.

To investigate the impact of silver nanoparticles (AgNPs) on the biofilm growth and architecture.

Solvent-mediated affinity of polymer-wrapped single-walled carbon nanotubes for chemically modified surfaces.

Semiconducting single-walled carbon nanotube (s-CNT) arrays are being explored for next-generation semiconductor electronics. Even with the multitude of alignment and spatially localized s-CNT deposition methods designed to control s-CNT deposition, fundamental understanding of the driving forces for s-CNT deposition is still lacking. The individual roles of the dispersant, solvent, target substrate composition, and the s-CNT itself are not completely understood because it is difficult to decouple depositio...


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