Wearable flexible electronics (WFEs) made of multifunctional hydrogels provide an approach for monitoring the human health such as human activities and human sweat. However, it is still necessary to ...develop a stimulus-responsive hydrogel sensor with the shape-memory effect (SME) to broaden the applications. Herein, we designed and fabricated a type of supramolecular polyampholyte hydrogel with salt-mediated triple SME, ionic conductivity (0.24-3.06 S m
−1
), high stretchability (up to 1500%) and self-healing property (up to 70%), which can be applied as shape-memory sensor and strain sensor. The SME endowed the sensors with the ability to detect the concentration changes in a saline solution by visual shape transformation. The conductivity caused the sensors to react with an instant electric signal when they detected human motion, while the stretchability allowed the sensors to bear large-scale mechanical deformation. The spontaneous self-healing and self-adhesive capabilities gave the sensors higher reliability, extended lifetime, and good attachment to human skin. Therefore, this multifunctional hydrogel can be a good candidate for precisely and conveniently monitoring the human health.
A type of supramolecular polyampholyte hydrogel with salt-mediated triple shape-memory effect, ionic conductivity, high stretchability and self-healing property was fabricated, which can be applied for strain sensors to monitor human health.
Acyl-homoserine lactones (AHLs)-mediated quorum sensing in bacterial communities have been extensively observed. However, the metabolic pathways regulated by AHLs in bacteria remain elusive. Here, we ...combined long-term reactor operation with microbiological and metabolomics analyses to explore the regulatory pathways for different AHLs in anammox consortia, which perform promising nitrogen removal for wastewater treatment. The results showed that no obvious shifts induced by exogenous AHLs occurred in the microbial community and, mainly, dosing AHLs induced changes in the metabolites. 3OC6-HSL, C6-HSL, and C8-HSL controlled the electron transport carriers that influence the bacterial activity. In contrast, only 3OC6-HSL regulated LysoPC(20:0) metabolism, which affected bacterial growth. AHLs mainly regulated the synthesis of the amino acids Ala, Val, and Glu and selectively regulated Asp and Leu to affect extracellular proteins. Simultaneously, all the AHLs regulated the ManNAc biosynthetic pathways, while OC6-HSL, OC8-HSL, and C6-HSL particularly enriched the UDP-GlcNAc pathway to promote exopolysaccharides, resulting in different aggregation levels of the anammox consortia. Our results not only provide the first metabolic insights into the means by which AHLs affect anammox consortia but also hint at potential strategies for overcoming the limitations of the long start-up period required for wastewater treatment by anammox processing.
To solve the difficulties in threshold selection and poor performance under low signal‐to‐noise ratio (SNR) conditions in existing spectrum sensing algorithms, a graph‐based spectrum sensing ...algorithm using nonlinear function regulation was proposed. The idea was to add a specific nonlinear transformation between the normalisation and quantization steps of the existing signal‐to‐graph converter (SGC). If the autocorrelation function of the observed signal selected as the input fed to SGC, the nonlinear function has the ability to adjust the uniformity of its probability distribution, increasing the probability of the observed signal being transformed into a complete graph under the alternative hypothesis, whereas remaining a noncomplete graph under the null hypothesis. Thus transformed the graph‐based spectrum sensing into a complete graph‐detection problem. Based on the theory of dispersive ordering, a theoretical analysis of the mechanism by which nonlinear transformations affect graph connectivity was conducted. The simulation results showed that the detection performance of the proposed algorithm was superior to that of existing graph‐based spectrum sensing algorithms. When SNR was −7 dB, the detection probability of the proposed algorithm exceeded 95%. Moreover, among the existing graph‐based spectrum sensing algorithms, the proposed algorithm exhibited the lowest computational complexity apart from the block range‐based method.
In this study, an improved graph‐based spectrum sensing algorithm using nonlinear function regulation was proposed, which converted the spectrum sensing problem into complete graph detection using nonlinear function adjustment, effectively solved the difficulties in threshold selection and poor performance under low signal‐to‐noise ratio (SNR) conditions.
Learning to let go: Controlled release of cargo (purple cubes) from lectin (blue squares)‐gated nanopores was achieved using mannose (green loops)‐functionalized mesoporous silica (see scheme). The ...protein nanogates could be opened either by decreasing the pH of the buffer or by adding competing glucose (yellow rings) to release the cargo from the pores.
This study aims to investigate the effect of industrial development strategies on the distribution of pollution in China. For this purpose, it uses the Theil index to measure the degree to which ...pollution was concentrated in particular areas of China from 2003 to 2015. Using chart analysis, it shows that industries became more widely spread out over time, and finds water-polluted cities but no air-polluted cities in areas of high industry concentration. Employing estimates from the Theil indices, I find that, while the within-region and between-region imbalances of industrial output were both reduced by the strategic plan, the speed of water pollution diversion does not align with the overall movement of industries, and there is not much between-region movement in wastewater pollution. The distribution of soot emissions is found to differ significantly from that of industrial output, with negligible initial levels and subsequent changes in the between-region concentration of soot emissions. Most of the initial concentration and changes in concentration are within region, suggesting that industrial development strategies have helped spread industries out more evenly. Meanwhile, the distribution of industries is found to have changed the distribution of water pollution, but it did not have any impact on the concentration of air pollution.
•Superb stability and redispersibility of the nanogel by Maillard modification.•Notable improvement of bioavailability of curcumin by the nanogel carrier.•Detailed mechanistic speculation by ...comparison with the nanoparticle.
In this work, ovalbumin-dextran nanogels were fabricated via the Maillard reaction followed by a heat-gelation process and their potential to improve curcumin bioavailability was investigated using an in vitro gastrointestinal tract. The result of electrophoresis, conjugation efficiency and yield, and far-UV circular dichroism verified the covalent attachment of dextran to ovalbumin by the Maillard reaction. The conjugates were then heated at the isoelectric point of ovalbumin to give stable nanogels. The transmission electron microscopy observation suggested that nanogels displayed a spherical structure. Curcumin was loaded into nanogels by a pH-driven method and the incorporation of curcumin affected the morphology of nanogels marginally. The transformation of curcumin in nanogels was significantly higher than that in ovalbumin nanoparticle. On the other hand, the bioaccessibility was similar for curcumin in nanogels and nanoparticle. The ovalbumin-dextran nanogels hold the potential as delivery systems for curcumin to fortify functional foods and beverages.
The cultural landscape in traditional settlements is an important historical and cultural resource created by human beings in the process of historical evolution, and is an important resource for the ...development of traditional settlement tourism. This paper selected 21 representative traditional settlements for research using online comments from tourists as data and content analytical methods including high-frequency vocabulary, semantic networks and emotional attitudes to explore the public perspective on the connotations of cultural landscape features in traditional settlements. There are four major findings, showing first that the cultural landscape of traditional settlements contains three core elements. Second, the semantic network relationships of the core elements show a significant central-edge tendency; and third, the emotional perception of cultural landscapes in traditional settlements is generally positive, and there is no significant difference emotionally between each core element. Last, the public's perception of the cultural connotations of the landscape is seriously insufficient. Based on the research results, planning suggestions and countermeasures for the conservation and utilization of cultural landscapes in traditional settlements are proposed.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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