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Antimicrobial-resistant bacterial infections are a major and costly public health concern. Several pathogens are already pan-resistant, representing a major cause of mortality in patients suffering from nosocomial infections. Drug efflux pumps, which remove compounds from the bacterial cell, thereby lowering the antimicrobial concentration to sub-toxic levels, play a major role in multidrug resistance. In this Special Issue, we present up-to-date knowledge of the mechanism of RND efflux pumps, the identification and characterization of efflux pumps from emerging pathogens and their role in antimicrobial resistance, and progress made on the development of specific inhibitors. This collection of data could serve as a basis for antimicrobial drug discovery aimed at inhibiting drug efflux pumps to reverse resistance in some of the most resistant pathogens.

MdtF (YhiV) --- multidrug resistance --- RND-type efflux pump --- dye accumulation --- real-time efflux --- pathogens --- RND --- evolution --- efflux pump --- adaptation --- Aliarcobacter butzleri --- RND efflux pumps --- virulence --- resistance --- RND pump --- dominant negative effect --- assembly --- protein-protein interaction --- mutation --- drug resistance --- cystic fibrosis --- prevalence of efflux resistance mechanisms --- hospital acquired infections --- antibiotic resistance --- allostery --- antimicrobial resistance --- conformational changes --- energetic transition --- gram-negative bacteria --- pump activation --- n/a

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This Special Issue provides an update on the state of the art and current trends in polymeric drug-delivery systems specifically designed for improving drug bioavailability. The multiple contributions received further strengthen the role of polymers in modern drug delivery and targeting, illustrating the different approaches possible and unveiling what the future may bring.

Medicine --- Pharmaceutical industries --- cystic fibrosis --- Pseudomonas aeruginosa --- liposomes --- efflux pump inhibitor --- PABN --- aminoglycosides --- macrolides --- poloxamer --- thiourea --- thiolation --- mucoadhesion --- drug release --- in vivo analysis --- in vitro dissolution studies --- S-propargyl-cysteine --- poly(lactic acid) --- endogenous hydrogen sulfide --- water-in-oil-in-water --- rheumatoid arthritis --- chitosan --- drug delivery --- drug absorption --- intestinal assimilation --- oral bioavailability --- nanoemulsions --- micelles --- SEDDS --- zeta potential --- sustained release --- albumin nanoparticle --- MPT0B291 --- high-pressure homogenizer --- histone deacetylase --- calix[8]arenes --- silibinin --- inclusion complexes --- PEGylation --- cytotoxicity --- oromucosal films --- sodium alginate --- nanoparticle drug carriers --- digoxin --- zein --- heart failure --- polymer–liposome complexes --- Pluronic®-poly(acrylic acid) --- Pluronic®-poly(N,N-dimethylaminoethyl methacrylate) --- stimuli-responsive --- intelligent drug delivery systems --- liposome --- polymer --- long circulation --- polymer–lipid conjugates --- targeting --- stimulus-responsive --- antibody --- affinity --- cyclodextrin --- protein therapeutics --- sustained drug delivery --- Nitric oxide --- hydrogel --- wound dressing --- chronic wounds --- glycyrrhetinic acid --- Soluplus® --- solid dispersions --- anti-inflammatory --- biosafety --- bioavailability --- n/a --- polymer-liposome complexes --- polymer-lipid conjugates

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Today, the food and water that we encounter in any part of the world could contain antibiotic residues and/or antibiotic-resistant bacteria. This book presents research evidence for this and also a potential way to mitigate the problem. Although not presented in this book, it is likely that this situation exists for all other types of antimicrobial agents as well, including antivirals, antifungals, and antiprotozoal agents. The presence of antibiotic residues and/or antibiotic-resistant bacteria contributes to the generation and propagation of resistance in disease-causing pathogens in humans and animals. Therefore, the medicines that we use to treat and/or prevent infections will not work as expected in many cases. It is estimated that if we do not contain antimicrobial resistance urgently, by 2050, up to 10 million people will die due to bacterial infectious diseases, such as pneumonia, skin infections, urinary tract infections, etc., which were once easily treatable. However, this book presents a system that can eliminate resistant bacteria and antibiotics from the environment, with the potential to work on other environmental microbes and antimicrobials. This book opens pathways for academics and scientists to do further research on antimicrobials and antimicrobial-resistant bacteria in various environmental areas and also presents evidence for policymakers to take further action and make the general public aware of the current situation in this context.

antibiotic resistance --- community --- environment --- India --- coliforms --- commensal --- antibiotic resistance genes --- blaCTX-M --- blaTEM --- qepA --- hospital wastewater --- core-shell --- disinfection --- Escherichia coli --- nanoparticles --- pathogens --- silver --- solar-photocatalysis --- Staphylococcus aureus --- water --- zinc oxide --- S. aureus --- beaches --- multiple-antibiotic resistance --- ramA --- efflux pump --- multilocus sequence typing --- surface water --- antibiotics --- pakchoi --- endophytic bacteria --- antibiotic-resistant genes --- hydroponic cultivation --- Campylobacter --- poultry --- antibiotic susceptibility --- Rep-PCR --- cdt toxin --- Acinetobacter --- JDS3 --- river --- carbapenemases --- antimicrobial resistance --- genotypes --- non-typhoidal Salmonella --- genes --- integrons --- subtyping --- ESBL --- MRSA --- VRE --- sewage sludge --- PER-1 --- pathogenic E. coli --- harvested rainwater --- public health --- Sub-Saharan Africa --- alternative water source --- farmer --- veterinary antibiotics use --- knowledge --- behavior probability model --- China --- antibiotics residue --- food animals --- bacteria --- Nigeria --- E. coli --- antibiotic-resistance gene --- MARI --- MARP --- multidrug resistance --- flooring design --- Turkey --- antibacterial resistance --- enrofloxacin --- commensal E. coli --- ESBL-producing E. coli --- β-lactamase genes --- insertion sequences --- antibiotic residues --- aquatic environment --- ciprofloxacin --- Fe-doped ZnO nanoparticles --- photocatalysis --- sunlight --- ceragenin --- multidrug-resistant bacteria --- biofilm --- antimicrobial peptides --- colistin --- n/a

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Carbapenem-resistant Enterobacterales (CRE) are a common cause of infections in both community and healthcare settings and have become an increasing threat to public health worldwide. The focus of this Special Issue includes aspects concerning plasmid-mediated antimicrobial resistance along with other carbapenem resistance mechanisms. Understanding the prevalence and routes of transmission of CRE is important in developing specific interventions for healthcare facilities, as well as the general impact of CRE circulation on the environment. Attention has also been focused on carbapenemase testing in order to provide advanced phenotypic and molecular assays for the identification of CRE, as a valid tool for active global surveillance, and from this perspective, the study of resistance mechanisms can provide significant support for the development of new and appropriate antimicrobial molecules. For all of these reasons, the phenomenon of carbapenem resistance deserves more attention, for the sake of public health.

Research & information: general --- Biology, life sciences --- Microbiology (non-medical) --- carbapenem resistance --- carbapenemase --- whole genome sequencing --- long reads, plasmid --- Klebsiella pneumoniae --- extensively drug-resistant --- molecular typing --- carbapenemases --- Enterobacteriales --- human --- animal --- food --- environment --- carbapenemase-producing Enterobacterales --- KPC --- carbapenem --- multidrug resistance --- nosocomial --- Enterobacteriaceae --- ESBL --- resistance genes --- cattle --- blaOXA-48 --- ERIC-PCR --- plasmid profile analysis --- biofilm formation --- PCR-based replicon typing --- antibiotic-resistance --- sequence types --- multilocus sequence typing --- plasmids --- antimicrobial resistance --- carbapenem inactivation method --- carbapenem-resistant Enterobacterales --- real-time multiplex PCR --- whole-genome sequencing --- carbapenem-resistance --- Qatar --- CRE --- OXA-48 --- carbapenems resistance --- Gram-negative bacteria --- infection --- colonization --- COVID-19 --- K. pneumoniae --- porins --- ceftazidime/avibactam --- ESKAPE --- healthcare-associated infections --- antimicrobial peptides --- Temporin L --- Klebsiella michiganensis --- Citrobacter farmeri --- KPC-2 --- plasmid --- transposon --- carbapenem-resistant Enterobacteriaceae (CRE) --- outbreak --- infection control --- pulsed-field gel electrophoresis (PFGE) --- multilocus sequence typing (MLST) --- IMP-6 --- porin --- efflux pump --- nosocomial infections --- NDM-1 --- Fourier transform infrared spectroscopy --- Eazyplex® SuperBug CRE assay --- extended-spectrum beta-lactamases --- gram-negative rods --- LAMP method --- NDM --- VIM --- molecular epidemiology --- PFGE --- Carbapenemase producing Enterobacterales --- IncX-3 --- one health --- water --- colistin susceptibility testing --- broth microdilution --- colistin broth disc elution --- Vitek 2 compact --- rapid polymyxin NP test --- Etest --- ChromID colistin R agar --- micronaut MIC-strip colistin --- population analysis profiling --- Enterobacterales --- neonates --- plasmid-typing --- sequence type --- wastewater --- virulence --- carbapenem resistance --- carbapenemase --- whole genome sequencing --- long reads, plasmid --- Klebsiella pneumoniae --- extensively drug-resistant --- molecular typing --- carbapenemases --- Enterobacteriales --- human --- animal --- food --- environment --- carbapenemase-producing Enterobacterales --- KPC --- carbapenem --- multidrug resistance --- nosocomial --- Enterobacteriaceae --- ESBL --- resistance genes --- cattle --- blaOXA-48 --- ERIC-PCR --- plasmid profile analysis --- biofilm formation --- PCR-based replicon typing --- antibiotic-resistance --- sequence types --- multilocus sequence typing --- plasmids --- antimicrobial resistance --- carbapenem inactivation method --- carbapenem-resistant Enterobacterales --- real-time multiplex PCR --- whole-genome sequencing --- carbapenem-resistance --- Qatar --- CRE --- OXA-48 --- carbapenems resistance --- Gram-negative bacteria --- infection --- colonization --- COVID-19 --- K. pneumoniae --- porins --- ceftazidime/avibactam --- ESKAPE --- healthcare-associated infections --- antimicrobial peptides --- Temporin L --- Klebsiella michiganensis --- Citrobacter farmeri --- KPC-2 --- plasmid --- transposon --- carbapenem-resistant Enterobacteriaceae (CRE) --- outbreak --- infection control --- pulsed-field gel electrophoresis (PFGE) --- multilocus sequence typing (MLST) --- IMP-6 --- porin --- efflux pump --- nosocomial infections --- NDM-1 --- Fourier transform infrared spectroscopy --- Eazyplex® SuperBug CRE assay --- extended-spectrum beta-lactamases --- gram-negative rods --- LAMP method --- NDM --- VIM --- molecular epidemiology --- PFGE --- Carbapenemase producing Enterobacterales --- IncX-3 --- one health --- water --- colistin susceptibility testing --- broth microdilution --- colistin broth disc elution --- Vitek 2 compact --- rapid polymyxin NP test --- Etest --- ChromID colistin R agar --- micronaut MIC-strip colistin --- population analysis profiling --- Enterobacterales --- neonates --- plasmid-typing --- sequence type --- wastewater --- virulence

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Carbapenem-resistant Enterobacterales (CRE) are a common cause of infections in both community and healthcare settings and have become an increasing threat to public health worldwide. The focus of this Special Issue includes aspects concerning plasmid-mediated antimicrobial resistance along with other carbapenem resistance mechanisms. Understanding the prevalence and routes of transmission of CRE is important in developing specific interventions for healthcare facilities, as well as the general impact of CRE circulation on the environment. Attention has also been focused on carbapenemase testing in order to provide advanced phenotypic and molecular assays for the identification of CRE, as a valid tool for active global surveillance, and from this perspective, the study of resistance mechanisms can provide significant support for the development of new and appropriate antimicrobial molecules. For all of these reasons, the phenomenon of carbapenem resistance deserves more attention, for the sake of public health.

carbapenem resistance --- carbapenemase --- whole genome sequencing --- long reads, plasmid --- Klebsiella pneumoniae --- extensively drug-resistant --- molecular typing --- carbapenemases --- Enterobacteriales --- human --- animal --- food --- environment --- carbapenemase-producing Enterobacterales --- KPC --- carbapenem --- multidrug resistance --- nosocomial --- Enterobacteriaceae --- ESBL --- resistance genes --- cattle --- blaOXA-48 --- ERIC-PCR --- plasmid profile analysis --- biofilm formation --- PCR-based replicon typing --- antibiotic-resistance --- sequence types --- multilocus sequence typing --- plasmids --- antimicrobial resistance --- carbapenem inactivation method --- carbapenem-resistant Enterobacterales --- real-time multiplex PCR --- whole-genome sequencing --- carbapenem-resistance --- Qatar --- CRE --- OXA-48 --- carbapenems resistance --- Gram-negative bacteria --- infection --- colonization --- COVID-19 --- K. pneumoniae --- porins --- ceftazidime/avibactam --- ESKAPE --- healthcare-associated infections --- antimicrobial peptides --- Temporin L --- Klebsiella michiganensis --- Citrobacter farmeri --- KPC-2 --- plasmid --- transposon --- carbapenem-resistant Enterobacteriaceae (CRE) --- outbreak --- infection control --- pulsed-field gel electrophoresis (PFGE) --- multilocus sequence typing (MLST) --- IMP-6 --- porin --- efflux pump --- nosocomial infections --- NDM-1 --- Fourier transform infrared spectroscopy --- Eazyplex® SuperBug CRE assay --- extended-spectrum beta-lactamases --- gram-negative rods --- LAMP method --- NDM --- VIM --- molecular epidemiology --- PFGE --- Carbapenemase producing Enterobacterales --- IncX-3 --- one health --- water --- colistin susceptibility testing --- broth microdilution --- colistin broth disc elution --- Vitek 2 compact --- rapid polymyxin NP test --- Etest --- ChromID colistin R agar --- micronaut MIC-strip colistin --- population analysis profiling --- Enterobacterales --- neonates --- plasmid-typing --- sequence type --- wastewater --- virulence