1,041 research outputs found

    Fluoroplast Doped by Ag<sub>2</sub>O Nanoparticles as New Repairing Non-Cytotoxic Antibacterial Coating for Meat Industry

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    Foodborne infections are an important global health problem due to their high prevalence and potential for severe complications. Bacterial contamination of meat during processing at the enterprise can be a source of foodborne infections. Polymeric coatings with antibacterial properties can be applied to prevent bacterial contamination. A composite coating based on fluoroplast and Ag2O NPs can serve as such a coating. In present study, we, for the first time, created a composite coating based on fluoroplast and Ag2O NPs. Using laser ablation in water, we obtained spherical Ag2O NPs with an average size of 45 nm and a ζ-potential of −32 mV. The resulting Ag2O NPs at concentrations of 0.001–0.1% were transferred into acetone and mixed with a fluoroplast-based varnish. The developed coating made it possible to completely eliminate damage to a Teflon cutting board. The fluoroplast/Ag2O NP coating was free of defects and inhomogeneities at the nano level. The fluoroplast/Ag2O NP composite increased the production of ROS (H2O2, OH radical), 8-oxogualnine in DNA in vitro, and long-lived active forms of proteins. The effect depended on the mass fraction of the added Ag2O NPs. The 0.01–0.1% fluoroplast/NP Ag2O coating exhibited excellent bacteriostatic and bactericidal properties against both Gram-positive and Gram-negative bacteria but did not affect the viability of eukaryotic cells. The developed PTFE/NP Ag2O 0.01–0.1% coating can be used to protect cutting boards from bacterial contamination in the meat processing industry

    Nuclear modification of ΄\Upsilon states in pPb collisions at sNN\sqrt{s_\mathrm{NN}} = 5.02 TeV

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    Production cross sections of ΄\Upsilon(1S), ΄\Upsilon(2S), and ΄\Upsilon(3S) states decaying into \muplusmuminus in proton-lead (pPb) collisions are reported using data collected by the CMS experiment atsNN\sqrt{s_\mathrm{NN}} = 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. The nuclear modification factor for ΄\Upsilon(1S) is found to be RpPb(΄(1S))R_\mathrm{pPb}(\Upsilon(1S)) = 0.806 ±\pm 0.024 (stat) ±\pm 0.059 (syst). Similar results for the excited states indicate a sequential suppression pattern, such that RpPb(΄(1S))>RpPb(΄(2S))>RpPb(΄(3S))R_\mathrm{pPb}(\Upsilon(1S)) \gt R_\mathrm{pPb}(\Upsilon(2S)) \gt R_\mathrm{pPb}(\Upsilon(3S)). The suppression is much less pronounced in pPb than in PbPb collisions, and independent of transverse momentum pT΄p_\mathrm{T}^\Upsilon and center-of-mass rapidity yCM΄y_\mathrm{CM}^\Upsilon of the individual ΄\Upsilon state in the studied range pT΄<p_\mathrm{T}^\Upsilon \lt 30 GeV/c/c and ∣yCM΄∣<\vert y_\mathrm{CM}^\Upsilon\vert \lt 1.93. Models that incorporate sequential suppression of bottomonia in pPb collisions are in better agreement with the data than those which only assume initial-state modifications

    Search for CP violating top quark couplings in pp collisions at s \sqrt{s} = 13 TeV