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https://www.readbyqxmd.com/read/29455992/nanosilver-leverage-on-reactive-dyeing-of-cellulose-fibers-color-shading-color-fastness-and-biocidal-potentials
#1
Hanan B Ahmed, Hossam E Emam, Hamada M Mashaly, Mohamed Rehan
The current approach focuses on studying the leverage of nanosilver (AgNPs) incorporation on the dyeing process of viscose fibers by blue reactive dye. Nanosilver was straightway incorporated into viscose fibers using sodium citrate as nanogenerator. Owing to AgNPs incorporation, color of fibers was turned to greenish-blue and darker greenish color was observed with low Ag content (<1 g/kg). Regardless to the processes sequencing, color strength of fibers was magnified by increasing in Ag content. The constancy of fibers color was not affected by AgNPs inclusion, whatever the processes sequencing and Ag content...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29453259/common-hydraulic-fracturing-fluid-additives-alter-the-structure-and-function-of-anaerobic-microbial-communities
#2
Adam C Mumford, Denise M Akob, J Grace Klinges, Isabelle M Cozzarelli
The development of unconventional oil and gas (UOG) resources results in production of large volumes of wastewater containing a complex mixture of hydraulic fracturing chemical additives and components from the formation. Release of these wastewaters into the environment poses potential risks that are poorly understood. Microbial communities in stream sediments form the base of the food chain, and may serve as sentinels for changes in stream health. Iron reducing organisms have been shown to play a role in the biodegradation of a wide range of organic compounds, and to evaluate their response to UOG wastewater, we enriched anaerobic microbial communities from sediments collected upstream (background) and downstream (impacted) of an UOG wastewater injection disposal facility in the presence of hydraulic fracturing fluid (HFF) additives: guar gum, ethylene glycol, and two biocides, DBNPA and Bronopol...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29452593/a-review-on-biosynthesis-of-silver-nanoparticles-and-their-biocidal-properties
#3
REVIEW
Khwaja Salahuddin Siddiqi, Azamal Husen, Rifaqat A K Rao
Use of silver and silver salts is as old as human civilization but the fabrication of silver nanoparticles (Ag NPs) has only recently been recognized. They have been specifically used in agriculture and medicine as antibacterial, antifungal and antioxidants. It has been demonstrated that Ag NPs arrest the growth and multiplication of many bacteria such as Bacillus cereus, Staphylococcus aureus, Citrobacter koseri, Salmonella typhii, Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumonia, Vibrio parahaemolyticus and fungus Candida albicans by binding Ag/Ag + with the biomolecules present in the microbial cells...
February 16, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29442811/immobilization-of-n-halamine-based-polycation-on-nanodiamonds-for-high-dispersity-and-enhanced-biocidal-activity
#4
Xuefeng Peng, Weiwei Cao, Feng Jin, Xi Wang, Qiang Li, Huinan Chen, Xiaodong Xing
Novel bactericidal materials, polycation-based N-halamine functionalized nanodiamonds (PCN-NDs), were fabricated by coating of nanodiamonds (NDs) with quaternarized N-halamine polymers via a facile approach. Chemical modification of the particles was confirmed by FTIR, XPS and TGA. The particle diameters and dispersity of the functionalized NDs were investigated by TEM and DLS measurements. It was found that ND tight core aggregates could be broken into tiny nanoparticles with 40-50 nm through functionalization procedure, which resulted in stable colloidal dispersion solution over one month...
May 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29434397/evaluation-of-industrial-biocides-on-a-novel-aspergillus-versicolor-tanck-1-and-elucidation-of-their-probable-biocidal-mechanism
#5
S Kavitha, Yasmin Khambhaty, N K Chandra Babu
Abstract: In the present investigation, a novel fungus was isolated from leather watch strap and identified as Aspergillus versicolor TANCK-1 by 18 s rRNA sequencing. The isolated fungus was evaluated against three structurally different fungicides such as 2-(thiocyanomethylthio)benzothiazole (TCMTB), potassium dimethyldithiocarbamate (KDDC) and 2,2-dibromo-3-nitrilopropionamide (DBNP) to control the fungal growth. Among these, TCMTB was found to effectively inhibit the growth at a minimum concentration of 31...
March 2018: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/29433907/in%C3%A2-vitro-nuclear-receptor-inhibition-and-cytotoxicity-of-hydraulic-fracturing-chemicals-and-their-binary-mixtures
#6
Peter A Bain, Anu Kumar
The widespread use of hydraulic fracturing (HF) in oil and gas extraction operations has led to concern over environmental risks posed by chemicals used in HF fluids. Here we employed a suite of stable luciferase reporter gene assays to investigate the potential for selected HF chemicals or geogenics to activate or antagonise nuclear receptor signalling. We screened three biocides (bronopol [BP], glutaraldehyde [GA], and tetrakis(hydroxymethyl)phosphonium sulfate [THPS]), a surfactant (2-butoxyethanol), a friction reducer (polyacrylamide), and a coal seam geogenic (o-cresol) for their potential to act as agonists or antagonists of the estrogen receptor, androgen receptor, progesterone receptor (PR), glucocorticoid receptor or peroxisome proliferator-activated receptor gamma (PPARγ)...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29432643/growth-media-and-assay-plate-material-can-impact-on-the-effectiveness-of-cationic-biocides-and-antibiotics-against-different-bacterial-species
#7
Lucy J Bock, Charlotte K Hind, J Mark Sutton, Matthew E Wand
The effectiveness of several cationic disinfectants as well as colistin and polymyxin B were assessed under different growth conditions against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa strains. These conditions included different media (MH1, MH2, TSB and LB) and plate material (polypropylene and polystyrene). Results showed that MIC/MBC values of colistin and polymyxin B were significantly lower on polypropylene plates when compared to polystyrene plates regardless of media used. There were also differences for MIC/MBC values to certain biocides e...
February 12, 2018: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29427473/antimicrobial-and-cytotoxic-activity-of-silver-nanoparticles-synthesized-from-two-haloalkaliphilic-actinobacterial-strains-alone-and-in-combination-with-antibiotics
#8
Magdalena Wypij, Magdalena Świecimska, Joanna Czarnecka, Hanna Dahm, Mahendra Rai, Patrycja Golinska
AIMS: Presently, the effective antimicrobial agents have been limited by emergence of microbial strains with multi-drug resistance and biofilm formation potential. In the present study, we report remarkable antimicrobial activity of silver nanoparticles (AgNPs) synthesized from Streptomyces calidiresistens IF11 and IF17 strains, including inhibition of biofilm formation and synergistic effect of AgNPs and antibiotics against selected bacteria and yeasts. Cytotoxic effect of AgNPs on mammalian cell lines was also evaluated...
February 10, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29427090/extracellular-red-monascus-pigment-mediated-rapid-one-step-synthesis-of-silver-nanoparticles-and-its-application-in-biomedical-and-environment
#9
Sunil H Koli, Bhavana V Mohite, Rahul K Suryawanshi, Hemant P Borase, Satish V Patil
The development of a safe and eco-friendly method for metal nanoparticle synthesis has an increasing demand, due to emerging environmental and biological harms of hazardous chemicals used in existing nanosynthesis methods. The present investigation reports a rapid one-step, eco-friendly and green approach for the formation of nanosized silver particles (AgNPs) using extracellular non-toxic-colored fungal metabolites (Monascus pigments-MPs). The formation of nanosized silver particles utilizing Monascus pigments was confirmed after exposure of reaction mixture to sunlight, by visually color change and further established by spectrophotometric analysis...
February 10, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29421128/assessment-of-organotins-and-imposex-in-two-estuaries-of-the-northeastern-brazilian-coast
#10
Daniele Claudino Maciel, Ítalo Braga Castro, José Roberto Botelho de Souza, Gilvan Takeshi Yogui, Gilberto Fillmann, Eliete Zanardi-Lamardo
Butyltin compounds (BTs) were used worldwide, especially because of their properties as biocides. Due to its high toxicity, the use of tributyltin (TBT) in antifouling paints has been prohibited in most countries. The occurrence and impact of BTs were assessed in surface sediments and in Stramonita rustica populations of two tropical estuaries that host major ports in northeastern Brazil. ΣBT concentrations ranged from <LOQ to 542ngSng-1 dry weight in sediments while imposex was not observed in S. rustica...
January 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29421126/extended-imposex-monitoring-in-n-atlantic-spain-confirms-punctual-attainment-of-european-environmental-objectives-for-tbt
#11
José M Ruiz, Belén Carro, Naiara Albaina, Rodolfo Barreiro, Diego Rial, Juan Bellas
Legislation in the European Union (EU) aimed at reaching by 2015 a Good Ecological Status in regard to tributyltin (TBT, the biocide used in traditional antifouling paints). With a view to check such an achievement in N Atlantic Spain, baseline monitoring of gastropod imposex (the recommended assessment tool) was extended up to that date. In Galicia (the Western part of the study area) the use of the rock snail Nucella lapillus since 1996 had shown this environmental objective to be met as soon as 2009, but new surveys reveal no further improvement thereafter...
January 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29420585/distribution-of-triclosan-resistant-genes-in-major-pathogenic-microorganisms-revealed-by-metagenome-and-genome-wide-analysis
#12
Raees Khan, Nazish Roy, Kihyuck Choi, Seon-Woo Lee
The substantial use of triclosan (TCS) has been aimed to kill pathogenic bacteria, but TCS resistance seems to be prevalent in microbial species and limited knowledge exists about TCS resistance determinants in a majority of pathogenic bacteria. We aimed to evaluate the distribution of TCS resistance determinants in major pathogenic bacteria (N = 231) and to assess the enrichment of potentially pathogenic genera in TCS contaminated environments. A TCS-resistant gene (TRG) database was constructed and experimentally validated to predict TCS resistance in major pathogenic bacteria...
2018: PloS One
https://www.readbyqxmd.com/read/29419335/differential-effect-of-food-sanitizers-on-formation-of-viable-but-nonculturable-salmonella-enterica-in-poultry
#13
Laura Purevdorj-Gage, Brian Nixon, Kyle Bodine, Qilong Xu, William T Doerrler
A method for microscopic enumeration of viable Salmonella enterica in meat samples was developed by using the LIVE/DEAD BacLight kit technology. A two-step centrifugation and wash process was developed to clean the samples from food and chemical impurities that might otherwise interfere with the appropriate staining reactions. The accuracy of the BacLight kit-based viability assessments was confirmed with various validation tests that were conducted by following the manufacturer's instructions. For the biocide challenge tests, chicken parts each bearing around 8...
February 8, 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29414366/what-is-the-aquatic-toxicity-of-saponin-rich-plant-extracts-used-as-biopesticides
#14
Xiaogang Jiang, Hans Chr Bruun Hansen, Bjarne W Strobel, Nina Cedergreen
Saponin-rich extracts from Quillaja saponaria and Chenopodium quinoa have been registered by US EPA as active ingredients in biopesticides, and extract from tea seed powder, Camellia oleifera has been proposed for biocidal use. If saponin-rich biopesticides are efficient against pests, they are most likely also bioactive in the aquatic environment against non-target organisms. The aim of this study was to conduct an effect assessment of saponin-rich plant extracts by using species sensitivity distributions based on acute toxicity tests...
February 5, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29411062/aerogel-from-chemo-enzymatically-oxidized-fenugreek-gum-an-innovative-delivery-system-of-isothiazolinones-biocides
#15
Tiziana Silvetti, Luca Merlini, Milena Brasca, Yves M Galante
Aerogels of chemo-enzymatically oxidized, lyophilized fenugreek gum (EOLFG) were evaluated as "delivery system" (DS) of the microbiocide mix 5-chloro-2-methyl-4-isothiazolin-3-one (CIT) and 2-methyl-4-isothiazolin-3-one (MIT). These biocides have a broad activity spectrum and a low MIC (minimal inhibitory concentration) in the ppm range. They are approved under the EU Biocidal Product Directive for various applications, including cosmetics, are classified as skin sensitizers, and are under increasing scrutiny to limit or eliminate their use...
February 6, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29410096/surface-modifications-for-antimicrobial-effects-in-the-healthcare-setting-a-critical-overview
#16
REVIEW
Christian Adlhart, Joanna Verran, Nuno F Azevedo, Hulya Olmez, Minna M Keinänen-Toivola, Isabel Gouveia, Luis F Melo, Francy Crijns
The spread of infections in health care environments is a persistent and growing problem in most countries, aggravated by the development of microbial resistance to antibiotics and disinfectants. In addition to indwelling medical devices (implants, catheters, etc.), such infections may also result from adhesion of microbes either to external solid-water interfaces such as shower caps, taps, drains, etc, or to external solid-gas interfaces such as door handles, clothes, curtains, computer keyboards, etc. The latter are the main focus of the present work, where an overview of antimicrobial coatings for such applications is presented...
February 1, 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29409983/pacing-across-the-membrane-the-novel-pace-family-of-efflux-pumps-is-widespread-in-gram-negative-pathogens
#17
Karl A Hassan, Qi Liu, Liam D H Elbourne, Irshad Ahmad, David Sharples, Varsha Naidu, Chak Lam Chan, Liping Li, Steven P D Harborne, Alaska Pokhrel, Vincent L G Postis, Adrian Goldman, Peter J F Henderson, Ian T Paulsen
The proteobacterial antimicrobial compound efflux (PACE) family of transport proteins was only recently described. PACE family transport proteins can confer resistance to a range of biocides used as disinfectants and antiseptics, and are encoded by many important Gram-negative human pathogens. However, we are only just beginning to appreciate the range of functions and the mechanism(s) of transport operating in these proteins. Genes encoding PACE family proteins are typically conserved in the core genomes of bacterial species rather than on recently acquired mobile genetic elements, suggesting that they confer important core functions in addition to biocide resistance...
February 1, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29405085/the-potential-impact-of-using-surfactant-and-an-alcoholic-co-surfactant-on-srb-activity-during-eor
#18
Fabio Alexandre Chinalia, Mayara Borges Andrade, Tatiana Oliveira do Vale, Sueli Carvalho Dos Santos, Lilia Ferreira de Moura-Costa, Paulo Fernando de Almeida
Surfactants and co-surfactans play an important role in enhanced oil recovery (EOR) for they improve petroleum solubility and reduce interfacial tensions between oil, water and the rock formation. Ethanol is receiving renewed attention as potential co-surfactant because of the negative results obtained with the use of salts and alkaline substances in specific rock formations. On the other hand, sulphate-reducing bacteria (SRB) can use surfactant and co-surfactants as carbon sources and, consequently, this can increase the biological accumulation of sulphide (souring)...
February 6, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29397703/impacts-of-salinity-and-temperature-on-the-thyroidogenic-effects-of-the-biocide-diuron-in-menidia-beryllina
#19
Lucas Buruaem Moreira, Graciel Diamante, Marissa Giroux, Scott Coffin, Elvis Genbo Xu, Denis M S Abessa, Daniel Schlenk
Diuron is a herbicide used in agricultural, urban settings and also as an antifouling agent. Recent studies have indicated sub-lethal responses of diuron in the endocrine system of fish and amphibians. Given the potential of climate change to also alter fish endocrinology, the combination of environmental stressors with diuron may contribute to its sublethal toxicity. In this study, the effects of temperature and salinity on thyroid targets of diuron were assessed in juveniles of the estuarine fish Menidia beryllina under different conditions of salinity (10 and 20 ‰) and temperature (10 and 20οC)...
February 4, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29392106/environmental-risk-assessment-of-biocidal-products-identification-of-relevant-components-and-reliability-of-a-component-based-mixture-assessment
#20
Anja Coors, Pia Vollmar, Jennifer Heim, Frank Sacher, Anja Kehrer
Background: Biocidal products are mixtures of one or more active substances (a.s.) and a broad range of formulation additives. There is regulatory guidance currently under development that will specify how the combined effects of the a.s. and any relevant formulation additives shall be considered in the environmental risk assessment of biocidal products. The default option is a component-based approach (CBA) by which the toxicity of the product is predicted from the toxicity of 'relevant' components using concentration addition...
2018: Environmental Sciences Europe
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