查找使用阿拉丁产品的科研文献

Identification of TPS-d subfamily genes and functional characterization of three monoterpene synthases in slash pine

Shu Diao,Yini Zhang,Qifu Luan,Xianyin Ding,Jiaming Sun,Jingmin Jiang

Oleoresin terpenoids have been widely used in the food , pharmaceutical, and chemical industries. A thorough understanding of oleoresin terpenoid biosynthesis is important for the metabolic engineering of high-valued terpenoid products in plants and microbes and the improvement of oleoresin traits using molecular breeding strategies. TPS-d subfamily members, specific to conifers, determine the oleoresin terpenoid compound diversity. Here, we aimed to identify the TPS-d genes in slash pine ( Pinus elliottii ) and characterize their function and expression patterns in population. Our study reveals two main results: (1) A total of 52 terpene synthase (TPS) candidate genes were identified based on long-read transcripts of slash pine, 12 of which were successfully cloned from the secondary developing xylem RNA. Two levopimaradiene/abietadiene synthases (LAS), one monofunctional isopimaradiene synthase (mISO1)-like, and two α-pinene synthases were identified by comparing with previously known TPS. Next, the two α-pinene synthases and one β-pinene synthase producing multiple products were validated through heterologous expression and in vitro enzyme activity assays, which showed different product profiles from previously identified TPS. (2) The expression status of the cloned TPS genes in 240 slash pine individuals were analyzed. Four exhibited very low expression levels, including those identical to copalyl diphosphate synthases, hemiterpene synthases, diterpene synthases without activity, and one obtained without soluble protein in the heterologous expression. The expression levels of eight TPS genes participating in slash pine oleoresin biosynthesis varied in different individuals and were highly correlated with multiple transcriptional regulators, namely, MYB and MYC. The expression of two α-pinene synthase genes was significantly higher than that of the other TPS genes. Some TPS gene expression levels were positively correlated with the corresponding oleoresin component content. Our results provide an essential reference for exploring the mechanisms of terpene biosynthesis and regulation.

PBAT/TPS-based intelligent films loaded with anthocyanin microcapsules for monitoring shrimp freshness

Zhaocan Li,ShuYi Zhou,Yujuan Jin,Yanbo Wang,Huafeng Tian,Guoping Li

To enable real-time indication of food freshness and safety, a pH-responsive, color-changing food packaging film was developed. Blueberry anthocyanin (BA) was encapsulated with polyethylene oxide (PEO) using microencapsulation technology to produce Blueberry anthocyanin - polyethylene oxide microcapsules (BA-PEO). These microcapsules were then incorporated into a poly(butylene adipate- co -terephthalate) (PBAT)/thermoplastic starch (TPS) matrix to fabricate a biodegradable film capable of in situ monitoring of food freshness. Appropriate addition of BA-PEO enhanced the thermal stability and tensile strength of the PBAT/TPS films. At a BA-PEO content of 2 phr, the oxygen permeability coefficient reached a minimum value of 1.47 × 10 −15  cm 3 ·cm·cm −2 ·s −1 ·Pa −1 , representing a 20.3% reduction. However, the incorporation of BA-PEO increased both the water vapor transmission rate (WVTR) and water vapor permeability (WVP). At 4 phr BA-PEO, the WVTR and WVP were 115.20 g·(m 2 ·24 h) −1 and 2.23 × 10 −14  g·(cm 2 ·s·Pa) −1 , respectively. A ΔE*ab value greater than 5 indicates that the color change is directly observable. Therefore, the potential of PBAT/TPS films filled with BA-PEO microcapsules is demonstrated in the field of intelligent food packaging materials.

Multifunctional Terahertz Metasensor Based on Multi-Fano Resonance for Ultrasensitive Biodetection

Hao Ruan,Yuan Zhong,Ride Wang,Xiaobao Zhang

Enhanced Oxidation of Xylene Using Plasma Activation of an Mn/Al2O3 Catalyst

Zuliang Wu,Weili Zhou,Zhoubin Zhu,Xiaodong Hao,Xuming Zhang

Study on the Electromagnetic Radiation Effect of an Aluminum Film in a Vacuum

Jie-Qing Fan,Yao Li,Fang Zhang,Jian-Hong Hao,Zhi-Wei Dong,Qiang Zhao

To study the electromagnetic radiation effect of a thermal control layer (TCL) on the surface of general spacecraft in a space environment, a model of a metal aluminum film material irradiated with microwaves was established, particle-in-cell (PIC)-Monte Carlo collisions (MCCs) simulation was used, and the processes of field emission, multipacting, outgassing, and impact ionization on the surface of thermal control materials were simulated. By comparing the primary-, secondary-, and impact ionization electrons produced under different gas densities, the influence of the process on metal aluminum film was analyzed. The simulation results show that the field emission, multipacting, and collisional ionization on the material surface all strengthened when the outgassing density exceeded the threshold value, and outgassing collision ionization was dominant among them. Avalanche ionization occurred on the material surface to generate plasma, which absorbs electromagnetic wave energy, and the total increase in the energy of ions and electrons may cause damage to the aluminum film, which is very important in its practical application.

Review on the History, Research, and Applications of Electrohydrodynamics

Emmanouil D. Fylladitakis,Michael P. Theodoridis,Antonios X. Moronis

Corona discharge refers to the phenomenon when the electric field near a conductor is strong enough to ionize the dielectric surrounding it but not strong enough to cause an electrical breakdown or arcing between conductors or other components. This phenomenon is unwanted and dangerous in high-voltage systems; however, a controlled corona discharge may be used to ionize a fluid and induce motion by directly converting the electrical energy into kinetic energy. Phenomena that involve the direct conversion of electrical energy into kinetic energy are known as electrohydrodynamic (EHD) and have a variety of possible applications today. This paper contains a literature review of the research regarding the EHD effects associated with corona discharges, from the first observation of the phenomenon to the most recent advancements on its mathematical modeling, as well as the advancements on specific applications, such as thrust, heat transfer improvement, boundary layer enhancement, drying, fluid pumping, and cooling.

Study on the Electromagnetic Radiation Effect of a Thermal Control Layer

Jie-Qing Fan,Yao Li,Fang Zhang,Jian-Hong Hao,Zhi-Wei Dong,Qiang Zhao

To study the electromagnetic radiation effect of a thermal control layer (TCL) on the surface of general spacecraft in a space environment, a model of thermal control material irradiated with microwaves was established, a particle-in-cell (PIC)-Monte Carlo collisions (MCC) simulation was used, and the processes of field emission, multipacting, outgassing, and impact ionization on the surface of thermal control materials were simulated. By comparing the primary electrons, secondary electrons, and impact ionization electrons produced under different field intensities and frequencies of electromagnetic waves, different compositions of outgassing, and different thermal control materials, the influencing factors and critical thresholds of avalanche ionization were obtained. The simulation results show that whether avalanche ionization occurs in outgassing on the surface of the TCL is affected by the electromagnetic wave amplitude, electromagnetic wave frequency, outgassing composition, and the material of the TCL. This provides a theoretical reference for the safe operation of spacecraft.

Mechanism of Decane Decomposition in a Pulsed Dielectric Barrier Discharge Reactor

Shuiliang Yao,Shan Weng,Qi Jin,Haiquan Lu,Zuliang Wu,Xuming Zhang,Jingyi Han,Hao Lu,Xiujuan Tang,Boqiong Jiang

Degradation of Pharmaceutical Contaminant Tetracycline in Aqueous Solution by Coaxial-Type DBD Plasma Reactor

Chunjing Hao,Zeyao Yan,Kefu Liu,Jian Qiu

Evolution of Core−Shell structure in PLA/PBAT-g-GMA/TPS ternary blends via multi-Indicator molecular simulations

Yuanchao He,Guangxiang Zhang,Huijia Lu,Xiaorong Wang,Ying Yu,Shiguang Wan,Xin Liu,Miao Xie,Guiyan Zhao

This study utilized molecular dynamics simulations to incorporate a poly(lactic acid) (PLA) matrix, poly(butylene adipate-co-terephthalate) modified with glycidyl methacrylate (PBAT-g-GMA), and thermoplastic starch (TPS) into an amorphous unit cell via a one-step blending method. Additionally, five PLA/PBAT-g-GMA/TPS (70/30/0, 70/25/5, 70/20/10, 70/15/15, 70/10/20) amorphous unit cells were created using a stepwise blending method. The radial distribution functions, hydrogen bond distribution, cohesive energy density, mixing energy, and diffusion coefficient of the blend components were analyzed. The optimal composition, identified through simulations, was subsequently prepared, and its glass transition temperature (T g ) was determined using differential scanning calorimetry (DSC). The fracture surface was examined via scanning electron microscopy (SEM). Results showed that the one-step blending model did not form a distinct core-shell interface, whereas higher PBAT ratios in the stepwise blending model exhibited clearer core-shell interfaces. The 70/20/10 composition model exhibited the highest mixing energy (1067.0 kcal/mol). The number of hydrogen bonds at the PBAT-TPS interface was maximized in this model, indicating the strongest interfacial interaction. The predicted T g of the 70/20/10 composition model was 59.9 °C, differing by only 0.6 °C from the measured value. The core-shell structure was observed on the frozen fracture surface, confirming the reliability of the model predictions. This study systematically analyzed the formation, distribution, and interaction of the core-shell interface in the PLA-based ternary blend system using molecular dynamics simulations and multi-indicator analysis. An optimal blending ratio was identified, providing a theoretical foundation for future material design and optimization.

Antioxidant and UV Shielding Dual-Functional Bio-Based Superhydrophobic Film for Sustainable Food Packaging: Lignin–TPS Based Composite Coating System

Wenyao Feng,Feng Li,Guiqing Lei,Wangqian Chen,Wenbin Xu,Boshen Meng,Changzhou Chen,Hongrui Jiang,Douyong Min

As a hydrophobic coating agent formulated with methyltrimethoxysilane (MTMS) and nano-silica (SiO 2 ) was coated on the lignin-reinforced thermoplastic starch (TPS), a sustainable packaging material with excellent antioxidant, ultraviolet-resistant, and high-barrier properties was developed. The TPS/lignin composite substrate was prepared by extrusion, and MTMS/SiO 2 was coated on the surface of TPS/lignin through a spraying process. The composite samples were subjected to a series of characterizations and tests, including SEM, FT-IR, water contact angle measurement, antioxidant property analysis, and UV shielding performance evaluation, and so forth. The results revealed that the introduction of lignin effectively improved the mechanical properties and ultraviolet shielding characteristics of the composite film, and the coating of MTMS/SiO 2 endowed the composite super hydrophobicity, for example, the water contact angle reaches over 157.26°. The water vapor transmission rate of the composite is reduced to 626.17 g/(m 2 24h), the ultraviolet shielding rate exceeds 99%, and the DPPH radical scavenging rate is reached 83.15%. In addition, the composite exhibits outstanding biodegradability. Overall, this study provides new ideas for the development of high-performance, multifunctional, and environmentally friendly food packaging materials. Highlights Lignin-reinforced thermoplastic starch (TPS) film is fabricated. TPS film is then coated with Methyltrimethoxysilane (MTMS)/SiO 2 . Lignin improves UV-shielding, antioxidant, strength, and thermal stability. MTMS/SiO 2 coating endows superhydrophobicity and low moisture permeability.

3D-printed SiC lattices integrated with lightweight quartz fiber/silica aerogel sandwich structure for thermal protection system

Hui Mei,Hao Li,Zhipeng Jin,Liangjun Li,Dou Yang,Chengyu Liang,Laifei Cheng,Litong Zhang

A lightweight thermal protection/insulation integrated sandwich structure for the aerospace thermal protection system (TPS) was developed with the aim of achieving superior mechanical strength and thermal insulation properties. On the one hand, the lattice frameworks of silicon carbide (SiC) ceramic thermally insulated components with body-centered lattice core (BCLC) were fabricated by selective laser sintering (SLS) 3D printing technology; on the other hand, the sol–gel process was applied to fill quartz fibers reinforced silica (Q f /SiO 2 ) aerogel into the hollow parts of the BCLCs to form a sandwich structure, thus further enhancing the mechanical and thermal insulation properties. To explore the impact of lattice core structure gradient on performance, we designed two types of BCLCs, single-layer one and double-layer one. By comparing the properties of the sandwich structures with the BCLCs, it was found that after the hot surface temperature was kept at 1000℃ for 1500 s, the backside temperature of the single-layer and double-layer sandwich structures decreased by 69.15℃ and 112.73℃, respectively, implying that the thermal insulation efficiency increased by 8.75 % and 13.85 %, respectively. Remarkably, it was precisely due to the filling of the Q f /SiO 2 aerogels that the compressive strength of the single-layer and double-layer sandwich structures reached 119.41 MPa and 35.16 MPa, respectively, which were successfully improved by 238.56 % and 256.23 %, respectively, in comparison with the BCLCs structures. Consequently, this study provides an efficient and reliable method for the preparation of thermal protection/insulation integrated components by using 3D printing technology combined with the sol–gel method, which has broader significance among academic and industrial communities.