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The Planctomycetes, Verrucomicrobia, Chlamydiae (PVC) and related phyla have recently emerged as fascinating subjects for research in evolutionary cell biology, ecology, biotechnology, evolution and human health. This interest is prompted by particular characteristics observed in the PVC superphylum that are otherwise rarely observed in bacteria but are however still poorly described or understood, such as the presence of a complex endomembrane system, or compacted DNA throughout most of the cell cycle. Therefore, the members of the PVC superphylum represent an excellent example of the value of studying bacteria other than ‘classical’ models.
genetic tools --- peptidoglycan --- PVC bacteria --- cell biology and cell division --- cell surface --- bioactive compounds
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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
PVC bacteria --- bioactive compounds --- Peptidoglycan --- cell surface --- Genetic tools --- cell biology and cell division
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Global concern about climate change caused by the exploitation of fossil fuels is encouraging the use of renewable energies. For instance, the European Union aims to be climate neutral by 2050. Biogas is an interesting renewable energy source due to its high calorific value. Today, biogas is mainly used for the production of electricity and heat by a combined heat and power engine. However, before its valorization, biogas needs to be desulfurized (H2S removal) to avoid corrosion and sulfur oxides emissions during its combustion. Biogas can be upgraded (CO2 removal) and used as vehicle fuel or injected into the natural gas grid. In the last 15 years, significant advances have occurred in the development of biological desulfurization processes. In this book with five chapters, the reader can find some of the latest advances in the biogas desulfurization and an overview of the state-of-the-art research. Three of them are research studies and two are reviews concerning the current state of biogas desulfurization technologies, economic analysis of alternatives, and the microbial ecology in biofiltration units. Biogas desulfurization is considered to be essential by many stakeholders (biogas producers, suppliers of biogas upgrading devices, gas traders, researchers, etc.) all around the world.
biotrickling filters --- in-situ biogas desulphurisation --- response surface methodology --- microbial ecology --- anoxic biotrickling filter --- desulfurization --- molecular techniques --- open-pore polyurethane foam --- anaerobic digestion --- autotrophic denitrification --- anoxic biofiltration --- Teflon --- biotrickling filter --- biogas --- desulphurisation --- H2S --- post-biogas desulphurisation --- hydrogen sulfide elimination --- removal process --- Ottengraf’s model --- packing material --- hydrogen sulfide --- open polyurethane foam --- sulfur-oxidizing bacteria --- anoxic --- PVC --- biofiltration --- PET
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In recent years, the development of biopolymers based on constituents obtained from natural resources has been gaining considerable attention. The utilization of biopolymers to engineer advanced bionanocomposites and hybrid materials is the focus of increasing scientific activity, explained by growing environmental concerns and interest in the novel features and multiple functionalities of these macromolecules.In this Special Issue, we aim to present the current state of the art in research pertaining to biopolymer-based bionanocomposites and hybrid materials, and their advanced applications. Contributions on the processing of biopolymers and bionanocomposites, the use of diverse biopolymer sources such as polysaccharides, the reinforcement of nanosized materials with biopolymers, and applications of these biopolymers, bionanocomposites, and biohybrid materials will constitute the backbone of this Special Issue.
Technology: general issues --- History of engineering & technology --- 3D printing --- 4D printing --- additive manufacturing --- biocomposite --- industry revolution --- polymer --- polycaprolactone --- green biocomposites --- hybrid biocomposites --- mechanical properties --- thermal properties --- natural fiber --- polylactic acid --- polylactic acid blends --- polylactic acid composites --- arrowroot fibers --- arrowroot starch --- plasticizer --- physical properties --- morphological properties --- Cymbopogan citratus fibre --- starch --- natural fibre --- biodegradation --- chitosan --- chitosan blends --- chitosan nanocomposites --- cellulose --- nanocellulose --- bamboo fibers --- hybrid --- composites --- thermoplastic --- thermoset --- mechanical --- thermal --- cellulose nanocrystals --- liquid crystals --- biomimetic --- corn starch --- kenaf fibre --- tensile properties --- water barrier properties --- rubber-based membrane --- filler --- adsorbent --- ENR/PVC --- thermoplastic elastomer --- wastewater treatment --- woven kenaf --- woven polyester --- DMA --- flammability --- Cymbopogan citratus fiber --- palm wax --- alkali treatment --- n/a
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This reprint contains a collection of state-of-the-art reviews and original research articles from leaders in the field of 3D/4D printing. It focuses on 3D/4D printing materials with novel and/or advanced functionalities, novel applications of 3DP material, and material synthesis and characterization techniques.
3D printing --- additive manufacturing --- dental forceps --- CFR (continuous fiber reinforcement) --- fatigue test --- mechanical testing --- composite --- carbon --- scanning electron microscopy --- polyphenylsulfone --- PPSF --- fire-resistant --- aircraft interior --- selective laser sintering --- direct writing --- PVC gel --- artificial muscle --- rheological behavior --- integrated printing --- 4D printing --- fused deposition modelling --- stereolithography --- polymers --- FEM --- FDM --- microstructure behavior --- linear analysis --- RVE --- polyimide --- aerogels --- chemical smoothing --- vapor smoothing --- PVB --- carbon fiber mold --- polylactic acid --- sound reflection --- excitation frequency --- porosity --- 3D printing technique --- thickness --- air gap --- FluidFM --- microstructures --- nanostructures --- biofunctionalization --- mechanical properties --- scanning probe lithography --- copper complex --- photocomposite --- LED --- laser write --- free radical photopolymerization --- bio-inspired spider silks --- adjustable mechanical properties --- shape morphing --- stimulus response --- n/a
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This book focuses on some fundamental issues of polymers’ natural degradation. It is mostly devoted to the different aspects of biodegradation, but some data on the action of water, oxygen, ozone, and UV/Vis light is also included. The consideration of the biodegradation in vivo as the superposition of decay and synthesis provides the opportunity for a fresh look at well-known processes.
Research & information: general --- Chemistry --- gelatin methacryloyl --- osteoinduction --- tannic acid --- crosslinking --- hydrogel --- biodegradable --- poly(3-hydroxybutyrate) --- chitosan --- electrospinning --- thermal oxidation --- biodegradation --- Sturm’s method --- biodegradation rates --- arterial hypertension --- vertebral cartilage --- rhomboid fossa --- anaerobic digestion --- biosorbent --- biostimulant --- magnetite --- nanoparticles --- kinetic model --- polyvinyl chloride (PVC) --- pyrolysis --- thermogravimetric analysis (TGA) --- kinetics --- thermodynamics --- artificial neural networks (ANN) --- mechanochemical method --- recycled polyurethane foam --- orthogonal test --- tensile strength --- thermal conductivity --- enzymatic hydrolysis --- deep eutectic solvents --- polyethylene terephthalate --- Box-Behnken design --- microwave depolymerization --- biodegradable polyester --- ultrafine electrospun fibers --- tetraphenylporphyrin --- metalloporphyrin complexes --- Fe(III) --- Sn(IV) --- X-ray diffraction --- DSC --- spin probe EPR method --- SEM --- biopolymeric nanoparticles --- synthesis --- applications --- medicine --- agriculture --- mechanical recycling --- closed-loop --- polyolefins --- circular testing --- polymer degradation --- epoxy resin --- composite material --- hygrothermal ageing --- water diffusion --- Fick model deviation --- statistical analysis --- box plot --- PCA --- titanium silicon oxide --- hydrolytic degradation --- titania --- silica --- antimicrobial activity --- photocatalytic degradation --- n/a --- Sturm's method
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Legionella spp. are ubiquitous microorganisms that are widely distributed in aquatic environments. Water systems of large buildings, such as hospitals, hotels, and rental units are often contaminated by legionellae and various parameters such as physical, chemical, and microbial building water system characteristics can influence Legionella occurrence. A range of physical and chemical disinfection methods have been proposed to control Legionella contamination; however, to date, the most effective procedures have not been defined. There is a need to survey legionellae in water systems to prevent legionellosis. Although the assessment of L. pneumophila in water is typically performed by culture isolation on selective media, it has several limits. For this reason, alternative tools for rapid, sensitive, and specific detection of Legionella in water samples have been proposed. In order to increase knowledge on different aspects of Legionella contamination in the water environment, this book gathers research studies related to the occurrence of Legionella in water systems of different environments; the role of different factors that can influence the Legionella contamination, as well as the advantages and disadvantages of different methodological approaches.
WTP 828 --- Legionella --- risk assessment plan --- water quality --- microbial analysis --- chemical analysis --- distal site positivity --- hot water return line --- chlorine --- HPC --- temperature --- water management --- free-living amoebae --- biological biocide --- cooling towers --- Legionella pneumophila --- protozoa --- Vermamoeba --- Acanthamoeba --- potable water --- hospital water --- water disinfection --- legionellosis --- Dental unit waterlines --- Legionella spp. --- risk management --- disinfection --- SBT --- molecular diversity --- hotels --- Healthcare-Associated Infections (HAIs) --- Surgical Handwashing Outlets (SHWOs) --- sensor-activated faucets --- free-living amoebae (FLA) --- virulence genes --- Willaertia magna C2c Maky --- culture media --- environmental monitoring --- quality control --- first draw --- second draw --- biofilm --- whole genome sequencing --- premise plumbing systems --- Legiolert --- ISO 11731 --- plate culture --- potable water samples --- flint --- copper --- PEX --- iron --- premise plumbing --- Legionnaires’ disease --- culture --- BCYE and GVPC media --- MLVA-genotypes --- clonal complex --- West Bank --- non-tuberculous mycobacteria --- Pseudomonas --- Acinetobacter --- amoebae --- PVC --- drinking water --- ecotype --- groundwater --- environmental factors --- magnesium --- niche --- n/a --- Legionnaires' disease
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In the last decade, issues related to pollution from microplastics in all environmental compartments and the associated health and environmental risks have been the focus of intense social, media, and political attention worldwide. The assessment, quantification, and study of the degradation processes of plastic debris in the ecosystem and its interaction with biota have been and are still the focus of intense multidisciplinary research. Plastic particles in the range from 1 to 5 mm and those in the sub-micrometer range are commonly denoted as microplastics and nanoplastics, respectively. Microplastics (MPs) are being recognized as nearly ubiquitous pollutants in water bodies, but their actual concentration, distribution, and effects on natural waters, sediments, and biota are still largely unknown. Contamination by microplastics of agricultural soil and other environmental areas is also becoming a matter of concern. Sampling, separation, detection, characterization and evaluating the degradation pathways of micro- and nano-plastic pollutants dispersed in the environment is a challenging and critical goal to understand their distribution, fate, and the related hazards for ecosystems. Given the interest in this topic, this Special Issue, entitled “Microplastics Degradation and Characterization”, is concerned with the latest developments in the study of microplastics.
Mathematics & science --- Chemistry --- Quantum & theoretical chemistry --- PEEK --- SIRM --- damage mechanisms --- GISAXS --- irradiation --- micro and nanoplastics --- freshwater --- sludge --- optical detection --- portable devices --- in situ detection --- microplastics --- marine sediment --- pet --- nylon 6 --- nylon 6,6 --- reversed-phase HPLC --- polyolefin --- polystyrene --- Pyr-GC/MS --- polymer degradation --- microparticles --- PLA --- PBS --- enzymes --- specificity --- thermal profile --- activation energy --- wastewater --- Raman spectroscopy --- laser speckle pattern --- transmittance --- sedimentation --- HDPE --- microbeads --- photocatalysis --- scavengers --- C,N-TiO2 --- remediation --- nanotechnology --- plastic pollution --- visible light photodegradation --- microplastic --- ratiometric detection --- no-wash fluorescent probe --- imaging --- one-pot reaction --- water remediation --- nanoplastic --- artificial ageing --- polyolefins --- polyethylene terephthalate --- microplastic fiber --- washing textile --- drying textile --- polyester yarn types --- microplastic extraction --- oil extraction --- density separation --- GC–MS --- mass spectrometry identification --- plastic polymers --- polyethylene --- terrestrial --- soil --- polymers --- geotechnics --- landfills --- geosynthetics --- GCL --- clay liner --- hydraulic conductivity --- plastics --- anthropogenic activities --- quantification --- marine --- multi-parametric platform --- bioplastics --- marine environment --- spectroscopy --- resin pellets --- nanoplastics --- microplastic detection and identification --- microplastic quantification --- food packaging --- particle release --- plastic consumption --- ecotoxicity assessment --- size influence --- concentration influence --- microplastic pellets --- weathering --- degradation --- Yellowness Index --- Fourier transform infrared spectroscopy --- persistent organic pollutants --- oxidative digestion --- Fenton’s reagent --- virgin --- aged --- SEM --- FTIR --- PAHs --- surface water --- chemical composition --- Ho Chi Minh City --- cement mortars --- municipal incinerated bottom ash --- PET pellets --- hydrogel --- potassium and sodium polyacrylate --- swelling --- physicochemical changes in the water --- polymeric nanoparticles --- Portugal --- resin --- pharmaceutical --- PVC --- paint --- wastewater treatment plant --- South China Sea --- pollution --- Py-GC/MS --- fragmentation and degradation --- mechanism
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