Pseudomonas aeruginosa is a prominent respiratory pathogen in cystic fibrosis (CF) patients, thriving in the hypoxic airway mucus. Previous studies have established the role of the oxygen-binding hemerythrin, Mhr, in enhancing P. aeruginosa's fitness under microaerobic conditions.
View Article and Find Full Text PDFRealizing adhesion between wet materials remains challenging because of the interfacial water. Current strategies depend on complicated surface modifications, resulting in limited functions. Herein, a facile strategy based on the powder of grape seed protein and tannic acid (GSP-TA) was reported to endow various non-adhesive hydrogels adhesion without chemical modifications for both hydrogels and adherents.
View Article and Find Full Text PDFDeveloping artificial substitutes that mimic the structures and performances of natural cartilage is of great importance. However, it is challenging to integrate the high strength, excellent biocompatibility, low coefficient of friction, long-term wear resistance, outstanding swelling resistance, and osseointegration potential into one material. Herein, a sandwich hydrogel with cartilage-mimetic structures and performances was prepared to achieve this goal.
View Article and Find Full Text PDFElectrocatalyst design is an important approach to prompt the commercialization of water electrolysis technologies. In this work, a ruthenium doped MoS/AB heterostructure is synthesized as an electrocatalyst for the hydrogen evolution reaction (HER) through hydrothermal and annealing processes. The physical-chemical characterization studies show that the MoS/AB heterostructure and the incorporation of Ru effectively induce a phase transition from 2H to 1T-MoS.
View Article and Find Full Text PDFACS Appl Mater Interfaces
August 2022
Designing hydrogels with adequate strength, remarkable swelling resistance, low friction coefficient, excellent biocompatibility, and osseointegration potential is essential for replacing articular cartilage. However, it remains challenging to integrate all these properties into one material. In this work, a Janus hydrogel was prepared from polyvinyl alcohol, chitosan, and sodium hyaluronate, followed by a one-sided dipping in situ precipitation mineralization to form a layer of hybridized hydroxyapatite (HAp), wherein the two surfaces had distinct compositions and functions.
View Article and Find Full Text PDFDeveloping articular cartilage substitutes required a combination of high compressive strength, excellent biocompatibility and low friction. Despite great success in tough hydrogels, this combination was hardly realized. Herein, a high strength, low friction, and biocompatible hydrogel was obtained by freezing-thawing polyvinyl alcohol and chitosan aqueous solutions three times, followed with soaking in sodium alginate aqueous solution.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2022
Fabricating artificial materials that mimic the structures and properties of tendons is of great significance. Possessing a tensile stress of approximately 10.0 MPa and a water content of around 60%, human tendons exhibit excellent mechanical properties to support daily functions.
View Article and Find Full Text PDFA method for degrading organic pollutants in suspension by applying laser-induced cavitation is presented. Cavitation bubbles are produced remotely by laser beams, achieving a purpose of non-contact degradation. In this work, laser-induced bubble dynamics in SiO sand suspension were studied by high-speed imaging.
View Article and Find Full Text PDFThe mechanism of laser cavitation peening (LCP) including laser shock wave, bubble collapse shock wave, and water-jet was investigated at various stand-off distances (γ) combined with experiment and simulation. The dynamic characteristics, pressure field, and temperature field of cavitation bubble were investigated. The Q235 steel was impacted by LCP and the strengthening mechanism was analyzed, and the chemical effect in LCP was discussed.
View Article and Find Full Text PDFA novel method of laser cavitation (LC) was proposed for degrading organic dye wastewater. Rhodamine B (RhB) aqueous solution was employed as the simulated organic dye wastewater, and a LC system was designed to conduct the experiments of degrading RhB. The effects of laser energy, initial concentration and cavitation time on the degradation were investigated.
View Article and Find Full Text PDFIn order to effectively destroy the structure of the passive oxidation film that covers zero-valent iron (ZVI), an Fe(iii)-reducing strain, namely sp., was isolated from anaerobic activated sludge and coated on ZVI, which was distributed in porous ceramsite made of iron dust, kaolin and straw, with a ratio of 7 : 3 : 1. Batch experiments showed that under the optimized conditions, the maximum removal amount of Cr(vi) by ZVI increased from 7.
View Article and Find Full Text PDFLithium-sulfur (Li-S) batteries are considered to be among the most promising energy storage technologies owing to their high theoretical capacity (1675 mA h g). At present, however, discharge mechanisms are complicated and remain a controversial issue. In this work, elemental sulfur, used as an electrical insulator for the cathode, was introduced into batteries for its potential chemical reactions in the electrolyte.
View Article and Find Full Text PDFA novel method whose starting materials was Fe-P waste slag and CO using a closed-loop carbon and energy cycle to synthesize LiFePO/C materials was proposed recently. In the first step, Fe-P slag was calcinated in a CO atmosphere to manufacture Fe(PO), in which the solid products were tested by XRD (X-ray diffraction) analysis and the gaseous products were analyzed by the gas detection method. In the second step, as-synthesized Fe(PO) was further used as the Fe and P source to manufacture LiFePO/C materials.
View Article and Find Full Text PDFWhile lower critical solution temperature (LCST)-type thermosensitive nanogels have been intensively studied, the upper critical solution temperature (UCST)-type versions are much less explored. This communication reports a method for the synthesis of zwitterionic UCST nanogels by reversible addition-fragmentation chain transfer (RAFT) polymerization-induced self-assembly in water-organic solvent mixtures. The nanogels were prepared by RAFT polymerization of 3-dimethyl(methacryloyloxyethyl)ammonium propanesulfonate, whose polymer is known to exhibit UCST behavior in water, conducted in ethanol-water mixtures at 70 °C using poly(poly(ethylene glycol) methyl ether methacrylate) as a macro-chain transfer agent (CTA) and a difunctional monomer as cross-linker.
View Article and Find Full Text PDFPorcine reproductive and respiratory syndrome virus (PRRSV) has caused one of the most economically devastating and pandemic diseases of swine. Previous studies have documented that PRRSV nonstructural protein-1α (nsp1α) was an interferon antagonist, but the mechanism by which nsp1α inhibited the interferon (IFN)-β production was unclear. Here, by site-directed mutagenesis of the predicted zinc-coordinating residues of the zinc-finger (ZF) domain of nsp1α or by deletion of the ZF domain of nsp1α, we explored whether the ZF domain was required for nsp1α to disrupt the IFN-β production.
View Article and Find Full Text PDFZhonghua Gan Zang Bing Za Zhi
June 2011
Objective: To compare the sensitivities of MALDI-TOF MS and direct PCR sequencing on gene mutations detection of hepatitis B virus.
Methods: 100 serum samples from chronic hepatitis B patients were collected, which consisted of 90 serum samples (study group) from 90 chronic hepatitis B patients received nucleoside analogues (NA) therapy for more than 1 year and HBV DNA titer still higher than 500 copies/ml and 10 serum samples (blank group) from 10 chronic hepatitis B patients never treated with antiviral therapy and HBV-DNA titer higher than 1 x 10(5) copies/ml. 9 known mutations associated with HBV P gene in these samples were detected by MALDI-TOF MS and direct PCR sequencing at the same time, TYPE4.
Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi
February 2009
Three hundred and eight mattress dust samples were collected from college dormitories in Shenzhen with a mite prevalence of 88% (271/308). From the samples, 6163 mites were isolated and identified. Dermatophagoides farinae, D.
View Article and Find Full Text PDFSheng Wu Yi Xue Gong Cheng Xue Za Zhi
April 2008
The host inflammatory reaction is a normal response to injury and the presence of foreign substances. Macrophage is one of the principal cell types in controlling host inflammatory and immune processes; hence, its response to biomaterials has a direct impact on biocompatibility and stability of biomaterials in vivo. This review describes the interaction of macrophages with tissue engineering related biomaterials.
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