Comparison study of Ag(I) and Au(III) loaded on magnetic thiourea-formaldehyde as disinfectants for water pathogenic microorganism’s deactivation

Publication date: August 2018Source: Journal of Environmental Chemical Engineering, Volume 6, Issue 4Author(s): Mohamed Azab El-Liethy, Khalid Z. Elwakeel, Mohammed S. AhmedAbstractMagnetic disinfectants were achieved through the polymerization of thiourea and formaldahyde in the presence of magnetite nano particles (MTUF), the as-prepared MTUF was loaded with Ag(I) or Au(III). The obtained disinfectants (MTUF-Ag and MTUF-Au) were test for some selected pathogenic strains deactivation. The toxicity of MTUF before and after Ag(I) or Au(II) loading was estimated. The antimicrobial activity tests of MTUF-Ag and MTUF-Au were carried out against Escherichia coli, Salmonella typhimurium and Pseudomonas aeruginosa as examples of Gram negative bacteria; Listeria monocytogenes, Staphylococcus aureus, Enterococcus faecalis, and Bacillus subtilis as examples of Gram positive bacteria; Candida albicans as representative for fungi. The results showed that the minimum inhibitory concentration (MIC) of MTF-Ag against Escherichia coli, Salmonella typhimurium, Listeria monocytogenes, Staphylococcus aureus and Candida albicans were 1.5, 2.0, 1.5, 1.0 and 2.5 mg mL−1, respectively after 40 min of contact time. While MTUF-Au showed higher MIC concentrations: 6.0, 4.0, 4.0, 4.0 and 6 mg mL−1 for the mentioned strains, respectively. The studied MTUF-Ag and MTUF-Au were successfully tested for deactivation of the studied pathogenic microorganism’s water and wastewater sa...
Source: Journal of Environmental Chemical Engineering - Category: Chemistry Source Type: research

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Publication date: Available online 31 May 2020Source: American Journal of Infection ControlAuthor(s): Johanna M. Vanegas, Lorena Salazar-Ospina, Gustavo Roncancio, J Natalia Jiménez
Source: American Journal of Infection Control - Category: Infectious Diseases Source Type: research
Publication date: Available online 30 May 2020Source: BurnsAuthor(s): Mohammad Hossein Farjah, Mohammad Reza Farahpour
Source: Burns - Category: Dermatology Source Type: research
In this study we addressed the question how a mevalonate (MVA)-auxotrophic Staphylococcus aureus ΔmvaS mutant can revert to prototrophy.
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Expression profiling by array Staphylococcus aureus Source Type: research
Contributors : Grihalakshmi Kakani ; Palmy R Jesudhasan ; Suresh D PillaiSeries Type : Expression profiling by arrayOrganism : Salmonella enterica subsp. enterica serovar TyphimuriumThe oxidative stress response to chlorine was analysed by the global gene expression profile for Salmonella Typhimurium
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Expression profiling by array Salmonella enterica subsp. enterica serovar Typhimurium Source Type: research
mente Capasso The interconversion of CO2 and HCO3− is catalyzed by a superfamily of metalloenzymes, known as carbonic anhydrases (CAs, EC 4.2.1.1), which maintain the equilibrium between dissolved inorganic CO2 and HCO3−. In the genome of Escherichia coli, a Gram-negative bacterium typically colonizing the lower intestine of warm-blooded organisms, the cyn operon gene includes the CynT gene, encoding for a β-CA, and CynS gene, encoding for the cyanase. CynT (β-CA) prevents the depletion of the cellular bicarbonate, which is further used in the reaction catalyzed by cyanase. A secon...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
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Source: Cancers - Category: Cancer & Oncology Authors: Tags: Article Source Type: research
Abstract Biological denitrification is a promising and green technology for air pollution control. To investigate the nitric oxide reductase (NOR) that dominates NO reduction efficiency in biological purification, the heterologous prokaryotic expression system of the norB gene, which encodes the core peptide of the catalytic reduction structure in the NOR from Achromobacter denitrificans strain TB, was constructed in Escherichia coli BL21 (DE3). Results showed that the 1218 bp-long norB gene was expressed at the highest level under 1.0 mM IPTG for 5 h at 30 °C, and the relative expression a...
Source: Chemosphere - Category: Chemistry Authors: Tags: Chemosphere Source Type: research
Conclusion Starter cultures are an important tool that contributes to ensure the safety of fermented meat products. Indeed, the microorganisms that constitute starter cultures may inhibit or reduce the growth of spoilage and/or pathogenic populations through mechanisms, such as production of certain metabolites or competitive exclusion. Thus, the use of starter cultures may reduce the need for chemical additives, such as nitrites and nitrates. Furthermore, the lower residual levels of nitrates and nitrites detected in fermented meat products inoculated with starter cultures are due to the ability of starters to metabolize...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research
Abstract One-pot synthesis of a new magnetic disinfectant was achieved through the polymerization of thiourea and formaldehyde in the presence of magnetite nanoparticles (MTUF). The obtained magnetic chelating resin was loaded with Ag(I) ions. This material was tested as a disinfectant for water pathogenic microorganism's deactivation. The toxicity of MTUF before and after Ag(I) loading was estimated. The antimicrobial activity tests of MTUF-Ag were carried out against Escherichia coli, Salmonella Typhimurium, and Pseudomonas aeruginosa as examples of Gram-negative bacteria; Listeria monocytogenes, Staphylococcus ...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research
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