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Aesthetic Filler Loss of sight: Recuperation After Recurring Hyaluronidase Injections.
The different structure-performance relationships of the two types of nanofibers have played their important roles on manipulating the accuracy of dual-stage drug controlled release profiles. The mechanism that the tri-layer core-shell nanostructure containing a blank CA middle layer adjusted the drug release behaviors was proposed.Resistant starch type 3 (RS3) benefits colon health, but the molecular structural reasons for this effect are unclear. Five rice starches with varied amylose content (19.1 %-40.6 %) were used to investigate their effect on gut microbiota. Size-exclusion chromatography and fluorophore-assisted carbohydrate electrophoresis were used to characterize whole starch molecular size distributions and chain length distributions. It was found that RS3 with more chains of degree of polymerization (DP) 36-100 and smaller molecular size can promote the relative abundance of some classes of gut bacteria, while other classes were promoted by RS3 with fewer chains of DP 36-100 and larger molecular size. X-ray diffraction and scanning electron microscopy showed that crystallinity types B or C and differences in physical surface affected the microbiota. This study shows that RS3s with different fine structures are utilized differently by gut microbiota, which may be applied to develop functional foods for gut health.Polypyrrole grafted with chitosan (PPy-g-CS) and poly (pyrrole-N-(1-naphthyl) ethylenediamine, a copolymer, (COP) have been synthesized by a one-step microwave procedure with carbon dots(C-Dots) as initiators. The electrostatic interaction between the positively charged polymers and negatively charged microbial cell membranes is widely anticipated to be responsible for cellular lysis. However, Escherichia coli exposed to PPy-g-CS (zeta potential = +46.9 mV) was completely perished after 3 h while COP (zeta potential = +64.1 mV) exhibited no antimicrobial effect. The two polymers were capable of eradicating Staphylococcus aureus, implying the charged effect is the main mechanism of cell death. The two polymers could also chelate calcium and other nutrients as well as form an external barrier to suppress the penetration of essential nutrients to support microbial survival and proliferation. In particular, pyrrole grafted chitosan was reasoned to stack onto the bacterial surface to impede the mass transfer and suppress the bacterial metabolic activity. The binding of chitosan to teichoic acids, essential acids of Gram-positive bacteria, would provoke a sequence of events and lead to bacterial death.Here, we describe a green approach to fabricate genipin crosslinked chitosan-kappa-carrageenan composite hydrogels (C-K hydrogels) aiming at reducing endotoxin level and bacteria burden in septic blood synchronously. The chemical compositions and morphologies of the developed C-K hydrogels were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy. The C-K hydrogels significantly inhibited adverse blood-material interactions such as hemolysis, complement activation, platelet activation and contact activation, and exhibited better anticoagulant properties than raw chitosan hydrogels. Most importantly, the optimized C2-K1 hydrogels were competent to eliminate 63.3 % of endotoxin in septic blood with a maximum adsorption capacity of 95.0 EU/g during a 3-h simulative hemoperfusion procedure. Bacteria cleansing experiments further demonstrated that the optimized C2-K1 hydrogels effectively decreased 46.0 % of E. coli and 68.7 % of S. aureus load, respectively. It is believed that the C-K hydrogels are promising hemoperfusion sorbents to treat severe septic patients.MXene/polymer composites have been used as electromagnetic interference (EMI) shielding materials due to metallic conductivity of MXene recently. Considering the biodegradability, nontoxic effects and renewable nature of biomass polymer, chitosan (CS)/MXene films with an EMI shielding function were prepared by vacuum assisted filtration. The well-aligned Ti3C2Tx layers endow CS/MXene films with excellent electrical conductivity, which is association with air humidity, and EMI shielding property. The 37-micron-thick CS/MXene film at a T3C2Tx content of 75 % exhibits a high EMI shielding effectiveness of ∼ 34.7 ± 0.2 dB due to the excellent electrical conductivity of CS/MXene films (∼ 1402 ± 70 S m-1) and multiple internal reflections of Ti3C2Tx flakes. Moreover, the specific shielding effectiveness of 13-micron-thick CS/MXene film at a T3C2Tx content of 50 % reaches to 15153.9 ± 153 dB cm-1, outperforming the reported biomass-based EMI shielding composites in the X-band frequency. Due to these advantages, the film shows potential applications in the next-generation EMI shielding materials.Nanocellulose (NC) possesses low density, high aspect ratio, impressive mechanical properties, nanoscale dimensions, which shows huge potential applications as a reinforced filler. Polyolefin (PO), represented by polyethylene (PE) and polypropylene (PP), has been widely used in industries. Recently nanocellulose/polyolefin nanocomposites (NC/PO nanocomposites) have caught more attention from the application of automotive components, aerospace, furniture, building, home appliances, and sport. In this review, the surface modifications of nanocellulose and polyolefin are summarized respectively, such as surface adsorption modification, small molecule modification, and graft copolymerization modification. The common preparations of NC/PO nanocomposites are discussed, including the melting compounding, the solvent casting, and the in-situ polymerization. find more The lightweight, mechanical properties, and aging-resistant properties of NC/PO nanocomposites are highlighted. Finally, the potentials and challenges for industrial production development of NC/PO nanocomposites are discussed.The aim of this study was to develop novel aerogels based on nanocrystalline cellulose (NCC), and chitosan (CS) for oily wastewater treatment. The quaternarized N-halamine siloxane monomer (QHS) was successfully synthesized and hydrolyzed to form quaternarized N-halamine siloxane polymer (PQHS) in the mixture of NCC and CS solution to improve the antibacterial properties of aerogels. The strong hydrophilicity of natural polymers NCC and CS and the microporous structure of aerogel endow the underwater oleophobic property. The applications of the aerogels as filter materials for oil/water separation are studied, and showed high separation efficiency of different types of oil/water mixtures. The presence of N-halamine structures in PQHS makes the aerogels effectively kill bacteria in oily sewage and inhibit the growth of bacteria on the surface of the materials. The properties of exceptional reusability, oil/water separation efficiency, and antibacterial efficacies render the aerogels as promising materials with potential applications in oily wastewater treatment.
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