A new peptide-mediated COF nanocatalytic amplification SERS quantitative assay for ultratrace Cu2+

Yiyi Shu,Shengfu Zhi,Sha Li,Aihui Liang,Zhiliang Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

Peptides are an important recognition element for small molecules and have been used in the field of biologicalanalysis. However, it has been rarely reported that a novel method combining peptides as recognitionelements with covalent organic framework (COF) as catalytic amplification signal to constructhighly sensitive and selective three-mode molecular spectroscopy. In this paper, high catalytic and stablethree COFs were prepared, and the catalysis of the new indicator nanoreaction of HAuCl4-sodiumformate(Fo) was studied by molecular spectral slope procedure. The produced gold nanoparticles (AuNPs) exhibita strong resonance Rayleigh scattering (RRS) peak at 370 nm and surface plasmon resonance absorption(Abs) peak at 540 nm. In the presence of molecular probes, a strongest surface-enhanced Raman scattering(SERS) peak was generated at 1617 cm1. Combining the COFTpBD amplification indicator reactionwith specific peptide (PT) reaction of Cu2+, a novel, sensitive and selective SERS/RRS/Abs assay platformwas established, with a SERS linear range of 0.005–0.115 nmol/L Cu2+. In addition, the two workingcurves of lg[Cu2+] vs SERS and [Cu2+] vs SERS intensity, and the nanocatalytic mechanism were discussed.

Study on Effects of Blending Fiber Type and Ratio on Antibacterial Properties of Chitosan Blended Yarns and Fabrics

Xiao Tian,Tszyin Poon,Yiyi Yang,Hong Hu,Jimin Fu,Jianhui Li,Ben Niu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9

Chitosan fiber possesses inherent advantages, such as excellent biocompatibility, nontoxicity as well asantibacterial property. However, there is no systematic study on the chitosan fiber blending effect with other fibers, and onthat basis, there is no suitable fiber blending technology for yarn and fabric production, which results in the incorrectproportion of chitosan fiber blended with other fiber type and thus lowers the fabric functionality as well as increases thematerial cost. In this study, thirteen chitosan blended yarns were designed and developed. Blending yarn structure wasexamined and the effects of blending fiber type and ratio on the antibacterial and physical property were firstly investigated. The experimental results show that the inhibition rate rises with the increase of the chitosan blending ratio. The polyester/cotton/chitosan and tencel/chitosan yarns have a better inhibition rate of Staphylococcus than that of the cotton/chitosan yarn,indicating that the blending fiber type has an impact on antibacterial properties. Moreover, various chitosan blended knittedfabrics were produced by using the chitosan blended yarns developed and their antibacterial, physical properties and comfortas well as anti-mite activity were evaluated. The results illustrate that the knitted fabrics with a small amount of chitosanfibers exhibit excellent antibacterial properties and desirable comfort. Furthermore, the chitosan blended fabrics present theanti-mites effect. This work would contribute to lowering the material cost of functional yarns and promoting thedevelopment of antibacterial textiles.

Transient Stability Simulation Analysis of Multi Node Power Network with Variable Speed Pumped Storage Units

Zhao Chong,Wang Longze,Ma Yiyi,Xiang Pengfei,Jiang Siyu,Chen Weidong,Zhang Yan,Li Meicheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4

The output characteristics of variable speed pumped storage are different from conventional hydropower and constant speed pumped storage units. The continuous increase of installed capacity of variable speed pumped storage, poses a severe challenge to the safe and stable operation of the local power grid. Proposed in this paper is a kind suitable for multi-node containing variable speed pump machine storage unit electric power network transient stability method, considering the variable speed pumped storage units by the end of the instantaneous failure prone to sudden drop transient power, the power network with more nodes each busbar voltage stable operation as the goal, according to the regional power grid data under typical operation modes, Based on the power system analysis software package, an electromechanical simulation model of the 7-node power grid with variable speed pumped storage unit was established. The influence on the transient stability of a 7-node power grid is analyzed by removing variable speed pumped-storage units and three-phase short-circuit faults. The transient stability of the power grid can be maintained under the conditions of removing variable speed pumped-storage units and three-phase short-circuit faults, but some bus voltages are higher than the specified voltage upper limit. The reactive power compensation device is installed to improve the voltage stability of the power grid system, which can prevent the overvoltage accident caused by the fault of the communication system, achieve the purpose of multi-node power network stability, and improve the safety and stability of the regional power system when the fault occurs.

Performance investigation of nanoscale thermal cloak by the perforated silicon film

Zhang Jian,Zhang Haochun,Zhang Dong,Sun Wenbo,Li Yiyi 한국물리학회 2022 Current Applied Physics Vol.35 No.-

In recent years, nanoscale thermal cloak, as a representative of nanoscale heat flux regulation devices, has attracted a lot of attention from researchers. However, the existing design methods are relatively complicated and all adopt constant temperature boundaries, the temperature changes constantly in the real environment, which greatly hinders its engineering applications. In this paper, inspired by phonon localization theory, we construct a nanoscale thermal cloak by a perforated silicon membrane and evaluate its cloaking performance and dynamic response. Results show that when the perforated area is fixed, the more the number of holes, the better the cloaking performance. In addition, the nanoscale thermal cloak still exhibits good cloaking performance in the dynamic environment. Finally, the cloaking mechanism is analyzed by calculating the phonon density of states (PDOS) and mode participation rate (MPR), and the reduction of thermal conductivity in the functional region is attributed to phonon localization.

Management strategy for Spodoptera frugiperda (Lepidoptera:Noctuidae) in mountain maize planting areas in China

Yao Yao,He Yanyan,Zhang Lilan,Wang Kun,Li Bin,Du Guangzu,Zhu Chunyue,Yi Xiaocui,Liu Yiyi,Zi Shengjiang,Chen Bin,Xiao Guanli 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4

The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is a major maize pest worldwide and has caused huge economic loss. To explore the control tactics of S. frugiperda in mountain maize planting fields, studies were performed in China from 2020 to 2021 for screening the S. frugiperda-resistant maize variety, seed coating agents, chemical insecticides, and biological agents. The results showed that 75 g/hm 2 Emamectin benzoate had better controlling efficacy (with a control efficacy of 91.05% at 1d) than other chemicals, so it was recommended in the high incidence period of pests. Compared with other seed coating treatments, 50% Lumi ngwei TM625FS (with a control efficacy of 76.19% at 10d) was the best seed coating against S. frugiperda. The biological control “Telenomus remus + Picromerus lewisi” and “T. remus + Eocanthecona furcellata” had good control efficacy on S. frugiperda with 76.01%, 64.10% at 20d, respectively. Additionally, there were lower numbers of S. frugiperda in maize variety GuiDan6, BaoYu9, and YanBaiYu8. In summary, this research rec ommended four effective pest management strategies (GuiDan6-resistant maize variety, 50% Lumingwei TM625FS-seed coating agents, 5% emamectin benzoate-chemical pesticide, and “T. remus + P. lewisi”-biological control) in mountain maize planting fields. The study provided effective control strategies for

Cloning, Expression, and Functional Characterization of the Dunaliella salina 5-enolpyruvylshikimate-3-phosphate Synthase Gene in Escherichia coli

Yi, Yi,Qiao, Dairong,Bai, Linhan,Xu, Hui,Li, Ya,Wang, Xiaolin,Cao, Yi The Microbiological Society of Korea 2007 The journal of microbiology Vol.45 No.2

5-enolpyruvylshikimate-3-phosphate synthase (EPSP synthase, EC 2.5.1.19) is the sixth enzyme in the shikimate pathway which is essential for the synthesis of aromatic amino acids and many secondary metabolites. The enzyme is widely involved in glyphosate tolerant transgenic plants because it is the primary target of the nonselective herbicide glyphosate. In this study, the Dunaliella salina EPSP synthase gene was cloned by RT-PCR approach. It contains an open reading frame encoding a protein of 514 amino acids with a calculated molecular weight of 54.6 KDa. The derived amino acid sequence showed high homology with other EPSP synthases. The Dunaliella salina EPSP synthase gene was expressed in Escherichia coli and the recombinant EPSP synthase were identified by functional complementation assay.