Publications by authors named "Yunchuan Qi"

The opportunistic pathogen develops increasing resistance toward even the most potent antibiotics. Like other bacteria, the pathogen produces a number of virulence factors including metallophores, which constitute an important group. Pseudomonads produce the iron-chelating metallophore (siderophore) pyochelin, which, in addition to its iron-scavenging ability, is an effector for the transcriptional regulator PchR in its Fe-bound form (ferripyochelin).

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Complex dynamic systems displaying interdependency between nitroaldol and boronic ester reactions have been demonstrated. Nitroalkane-1,3-diols, generated by the nitroaldol reaction, were susceptible to ester formation with different boronic acids in aprotic solvents, whereas hydrolysis of the esters occurred in the presence of water. The boronic ester formation led to significant stabilization of the nitroaldol adducts under basic conditions.

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Through a dynamic polymerization and self-sorting process, a range of lowellane macrocycles have been efficiently generated in nitroaldol systems composed of aromatic dialdehydes and aliphatic or aromatic dinitroalkanes. All identified macrocycles show a composition of two repeating units, resulting in tetra-β-nitroalcohols of different structures. The effects of the building block structure on the macrocyclization process have been demonstrated, and the influence from the solvent has been explored.

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The genus encompasses multiple human pathogens, including potential bioterrorism agents, that are often extensively antibiotic resistant. The FixLJ pathway in is a two-component system that regulates virulence. Previous work showed that mutations arising during chronic infection confer increased virulence while decreasing the activity of the FixLJ pathway.

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Dynamic covalent gels are synthesized from an aromatic trialdehyde and α,ω-dinitroalkanes via the nitroaldol reaction in organic solvents. The gelation process can be fine-tuned by changing the starting nitroalkanes, solvents, feed concentration, catalyst loading, or reaction temperature. The resulting organogels demonstrate good structural integrity and excellent self-healing ability.

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Dynamic covalent polymers of different topology have been synthesized from an aromatic dialdehyde and α,ω-dinitroalkanes via the nitroaldol reaction. All dinitroalkanes yielded dynamers with the dialdehyde, where the length of the dinitroalkane chain played a vital role in determining the structure of the final products. For longer dinitroalkanes, linear dynamers were produced, where the degree of polymerization reached a plateau at higher feed concentrations.

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Article Synopsis
  • Bisphenol-A (BPA), a common plasticizer, is released into water environments, and a new hybrid material made from FeO and graphene oxide has been developed to effectively remove BPA from contaminated water.
  • This FeO-graphene oxide hybrid exhibits a remarkable BPA adsorption capacity of 3293.9 mg/g, outperforming both regular graphene oxide (GO) and reduced graphene oxide (rGO) in terms of removal efficiency.
  • The material also demonstrates improved thermal stability, solid/liquid separation, and anti-fouling properties, while being cost-effective due to a significant reduction in the use of graphene oxide, showing promise for real-world water treatment applications.
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  • The development of supramolecular and constitutional dynamic chemistry has led to the creation of dynamic covalent polymers, which feature reversible covalent bonds that allow for adaptability and responsiveness.
  • These polymers exhibit fascinating properties such as self-healing, shape memory, recyclability, and stimuli-responsiveness, making them valuable in various applications.
  • Notably, their use in the biomedical field is expanding, with applications in areas like enzyme modulation, gene delivery, and materials for cell culture and wound-dressing.
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  • - A new type of eco-friendly adsorbent was created using κ-carrageenan and graphene oxide, known as κ-Car/GO gel bead adsorbents, designed for removing dye pollutants from water.
  • - Various methods were used to analyze the composition and structure of these gel beads, and their effectiveness in absorbing methylene blue dye was tested under different conditions, revealing a high maximum adsorption capacity.
  • - The adsorbents not only showed excellent removal capabilities but also retained their performance after multiple uses, and they can be easily separated from solutions through simple filtration.
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Article Synopsis
  • * Various characterization techniques (like FT-IR and SEM) were used to analyze these composite materials and their properties.
  • * The PS-GO composites showed greater efficiency in adsorbing both cationic and anionic dyes compared to standard graphene oxide, affected by factors like concentration, temperature, and pH.
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