JOURNAL OF APPLIED ENTOMOLOGY
·
2022
·Vol. 146
·期 7
·823-837
·
IF 2.183
Xuanyu He,Zhaodong Hao,Hui Li,Tian Xu,Ruixu Chen,Xiaohong Xia,Shouyin Li,Dejun Hao
Understanding the mechanism of insect resistance to toxic effects of phytochemicals can provide an insight into plant–herbivore interactions. Monochamus alternatus Hope, a main vector of pine wood nematode ( Bursaphelenchus xylophilus ), prefers to infest masson pine ( Pinus massoniana Lamb) and causes huge economic and environmental losses. α-Pinene is the primary component of resin produced by masson pine and plays a crucial role in defending against herbivorous insects, but its defensive effects on M . alternatus larvae are barely known. Here, we explored the physiological metabolism in M . alternatus larvae that were fumigated with (+)-α-pinene, (-)-α-pinene, β-pinene, (R)-(+)-limonene, myrcene and (-)-α-phellandrene. (+)-α-Pinene showed the highest fumigant toxicity to M . alternatus larvae among these monoterpenes, and the fourth instar larvae possessed the highest resistance to this compound at the larval stage. Comparative transcriptome analysis detected 423 up-regulated and 311 down-regulated genes in the larvae fumigated with (+)-α-pinene, which were mainly related to detoxification, energy and protein metabolism. Among the differentially expressed genes encoding for detoxification enzymes, 14 P450s, 13 UGTs, 1GSTs and 3ABCs were dramatically up-regulated in the larvae fumigated with (+)-α-pinene. Silencing of P450s via RNA interference led to an increased mortality in the larval fumigated with (+)-α-pinene. Piperonyl butoxide exposure significantly increased the mortality and inhibited the expressions of P450s, UGTs and ABCs in the larvae fumigated with (+)-α-pinene. These results suggested an important role of P450s in the resistance of M . alternatus larvae to (+)-α-pinene fumigation, which may facilitate the understanding of terpenoid detoxification in M . alternatus larvae.
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INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2016
·Vol. 51
·期 12
·2692-2700
·
IF 1.504
Sheng Geng,Yongsheng Chen,Arshad Mehmood Abbasi,Hanjun Ma,Haizhen Mo,Benguo Liu
Summary Leaf of Ampelopsis grossedentata is a new resource of functional foods with healthful properties. Antioxidant and α - glucosidase inhibitory activities of water extract (made in the style of drinking), tannin fraction (TF) and dihydromyricetin (DMY) from A. grossedentata leaves were evaluated. The main component of TF was identified as gallotannins. DPPH and ABTS radical scavenging activities and reducing power of TF were superior to those of water extract, however, inferior to those of DMY. In no PBS wash protocol of cellular antioxidant activity assay, DMY and TF exhibited similarly, while in PBS wash protocol, the value of TF was higher than that of DMY. In addition, TF possessed the highest α - glucosidase inhibitory activities (IC 50 = 1.94 μg mL −1 ), followed by water extract (IC 50 = 23.10 μg mL −1 ) and DMY (IC 50 = 72.21 μg mL −1 ). The strong α - glucosidase inhibitory activity of TF may attribute to the binding capacity to enzymes, as confirmed by fluorescence analysis.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 4
·623-632
·
IF 2.69
Yan Zhinan,Kang Yong,Li Dan,Liu Yu Chun
Hematite (α-Fe 2 O 3 ) is a promising alternative to the catalysts currently used due to its low cost, fairly good activity and environmentally friendly properties. In this study, α-Fe 2 O 3 /SiO 2 nanocatalysts promoted with cobalt and cerium (Co 3 O 4 -CeO 2 -α-Fe 2 O 3 /SiO 2 ) were prepared via wet co-impregnation method, and the effects of promoters on catalytic performances for SO 2 oxidation at different temperatures, SO 2 concentrations, cycle numbers, catalytic stability as well as catalyst charging were investigated. The results indicated that SO 2 conversion rose with the increasing of catalyst charging and SO 2 concentration. Also, the as-prepared catalyst had the maximum SO 2 conversion at the reaction temperature of 500 °C, excellent catalytic recyclability and activity stability. Its physicochemical and redox properties were characterized by XRD, BET, SEM, FT-IR and XPS. The results of XRD and FT-IR spectra confirmed that the formation of Ce 2 FeO 4 network in the Co-Ce co-doped catalysts proved the promoting effect of cerium on higher valence state of the active ingredient. The N2 adsorption/desorption results evidenced that cerium could increase the proportion of mesoporous, and the XPS spectra indicated that cobalt and cerium in the catalysts could increase the available oxygen (O β /O α ) for the redox reaction. Due to its excellent low onset temperature, fairly good activity and environmentally friendly properties, the as-prepared catalyst of Co 3 O 4 -CeO 2 -α-Fe 2 O 3 /SiO 2 appeared to be more efficient for the SO 2 conversion in a large concentration range.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Mo Qiu,Ruoqing Wang,Xinhua Qi
This paper reports a method of controllable synthesis of hollow polyhedral α-Fe 2 O 3 using H 3 btc and HF as additives. Three products with different morphologies were obtained by only adjusting the ratio of H 3 btc: HF. The as-prepared products were characterized using XRD, TG-DSC, FT-IR, Zeta potential analysis, UV, SEM and TEM. The characterization results reveal that H 3 btc is the key factor in preparing a hollow structure, and HF is vital to form a polyhedral morphology. On the basis of the time-dependent experiments, a probable growth mechanism of α-Fe 2 O 3 was proposed. Finally, the resulting hollow polyhedral α-Fe 2 O 3 exhibit good photocatalytic degradative ability for rhodamine B (RhB) molecules in water under visible light irradiation.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Jianpeng Wu,Kexu Zhan,Junshuo Zhang,Yu Wang,Shuaishuai Sun,Shouhu Xuan,Shiyu Lin,Zimu Li,Ziyang Fan,Shuai Liu,Zhihao Hu,Xinyi Wang,Xinglong Gong
Lightweight materials with outstanding mechanical durability and heat attenuation play an indispensable role in personnel safeguard. Aerogels are excellent insulation materials while presenting low strength, posing a challenge to integrated protection. Herein, a dehydration-induced aggregation strategy is proposed to reinforce lamellar aramid nanofiber aerogels through impregnation in polyvinyl alcohol (PVA) solution followed by hot-pressing. PVA shrinkage facilitates synergistic fiber crosslinking and sheet densification in the resulting AFPA aerogels, achieving extraordinary specific tensile modulus (1143.2 MPa cm 3 g −1 ) and toughness (2557 kJ m −3 ). Both experiments and simulations demonstrate that the aggregated fibrous network extends fracture period by re-orientation and crack deflection, which enables AFPAs 220 % and 162 % greater specific puncture energy than woods and leathers. Benefiting from the lamellar porous skeleton with low PVA content, AFPAs not only prevent the invasion of heat and fire, but maintain 95 % of initial strength and robust impact dissipation after heat treatment at 300 °C. With a low thermal conductivity of 31 mW m −1 K −1 , AFPAs provide better thermal comfort from −106 to 150 °C than duck down with only 31 % of its thickness. This integrated protection system can be re-established by a solvent-mediated recycling approach, promoting their sustainable applications across fire-fighting, anti-seismic building, and aircrafts.
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Food & Function
·
2025
·
IF 5.4
Hailing Song,Yun Ma,qian Du,Zeyuan Deng,Yalun Zou,Yadong Miao,Jing Li,Liufeng Zheng
Methionine-containing cyclolinopeptide ([1–9-NαC]-linusorb B2, CLB) and α-linolenic acid (ALA), two anti-inflammatory flaxseed constituents, were investigated for their combined vascular benefits. CLB-enriched orbitides were prepared for long-term high-fat diet (HFD)-fed mouse studies, while high-purity CLB monomer (>97%) was isolated via preparative chromatography for acute in vivo and cell-based assays. Structural confirmation and purity validation were achieved via mass spectrometry and liquid chromatography. CLB-enriched orbitides co-administered with ALA in HFD-fed mice reduced body weight gain, serum trimethylamine N-oxide (TMAO), dyslipidemia, and vascular inflammation, histologically confirmed by reduced pro-inflammatory mediators and endothelial repair. Purified CLB combined with ALA further demonstrated efficacy in alleviating TMAO-induced acute vascular inflammation in mice. Mechanistically, CLB enhanced ALA metabolism by upregulating key enzymes (lipoxygenases and cytochrome P450) and directly binding to their catalytic pockets. Combined effect loss upon enzyme inhibition confirmed ALA metabolic modulation as the key mechanism. These findings highlight CLB's role in amplifying ALA's efficacy to combat vascular inflammation.
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DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Junjie Liu,Jianmin Wu,Qiwen Sun,Jiancheng Wang,Yan Sun,Hengxuan Zhang
The high-viscosity poly-alpha-olefin was prepared from Fischer-Tropsch mixed α-olefins (FTO) polymerization under [EBIZrCl 2 /Al( i Bu) 3 /[Ph 3 C] + [B(C 6 F 5 ) 4 ] - system (EBI = rac -C 2 H 4 (1-Ind) 2 ), and its mechanism was investigated by in situ UV–Vis, 1 H NMR and ESI-MS. The results show that the kinematic viscosity at 100°C (KV 100 ), viscosity index (VI) and yield of product reach to 306.3 cSt, 244 and 81.12 % under optimum reaction condition, respectively. Through adjusting temperature to 20°C, in situ UV–Vis, 1 H NMR and ESI-MS are conducted to monitor the formation of origin species (EBIZr( i Bu) 2 + ), active species (EBIZr-σ-y n + (y = nonenyl, decenyl and undecenyl, n ≥ 1)), reactivated species and dormant species (EBIZr-η 3 -(1-R-C m H m+1 ) + (R = n-propyl and m = 6 or 7 or 8)). The simultaneous generation of active and dormant species is observed, and the reaction process is described as [FTO] + [catalyst] → [active species] + [dormant species]. This reaction fitting curve also conforms to the Boltzmann (R 2 ≥ 0.993). The effect of different types of olefins on catalytic evolution and product properties is investigated. The existence of multiple α-olefins inhibits the formation of the second inactivate species found in 1-decene polymerization. However, the multiple isomeric olefins further enhance the possibility of dormant species generation, because of the promotion of β-H concentration in catalytic system, leading to the higher activation energy (19.597kJ/mol) than pure 1-decene (10.949kJ/mol). Based on those findings, a possible mechanism in ansa-zirconocene catalyzed to prepare high-viscosity poly-alpha-olefin from Fischer-Tropsch mixed α-olefins is proposed.
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JOURNAL OF COORDINATION CHEMISTRY
·
2025
·
IF 2.1
Jinzhe Wang,Hongliang Huo,Lili Ma,Xue Zhai,Feng Li,Zhiqiu Zhang,Cuiqin Li
PNP chromium complex (PNP-Cr) with high selectivity of high-carbon α-olefins in ethylene oligomerization was synthesized to modify nano-SiO2 to obtain heterogeneous PNP chromium catalyst (PNP-Cr@SiO2) with high dispersibility of catalytic active centers. Upon activation with methylaluminoxane (MAO), PNP-Cr@SiO2 had a high catalytic activity of 1.13 × 105 g/(mol Cr·h) and the selectivity of 79.98% for C8+ α-olefins in ethylene oligomerization. Moreover, PNP-Cr@SiO2 had remarkable recyclability and catalytic stability compared with the corresponding homogeneous catalyst (PNP-Cr), and the catalytic activity decreased to 0.95 × 105 g/(mol Cr·h) and the selectivity for C8+ α-olefins slightly decreased to 78.86% after three cycles. Grey relational analysis confirmed that reaction pressure and reaction temperature were the main factors affecting the catalytic activity of PNP-Cr@SiO2 and the selectivity for high-carbon α-olefins in ethylene oligomerization. PNP-Cr@SiO2 had higher selectivity for C8+ α-olefins because the catalytic active centers were primarily distributed on the surface of nano-SiO2 to facilitate the formation of large metallacycle and the insertion of the oligomer (1-octene) into the metallacycle compared with other heterogeneous catalysts.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2014
·Vol. 41
·期 10
·7695-7702
·
IF 1.54
Jin Qingdong,Li Fubo,Li Ying,Jin Fei,Jiang Lin
A series of α-alkoxyimino-[1-(4-methylpiperazino-1-yl)carbonylmethyl-1 H -benzimidazol-2-yl] acetonitriles were synthesized from o -phenylenediamine, ethyl cyanoacetate, chloroacetyl piperazine, and haloalkane/benzyl chloride by multi-step reactions. The structures of the target compounds were elucidated by IR, 1 H NMR, MS, and elemental analysis. All the target compounds were tested for in vitro antifungal activities against Sclerotinia sclerotiorum and Botrytis cinerea by the mycelium growth rate method, and the results indicated that some compounds displayed higher antifungal activity as compared to carbendazim.
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SYNTHESIS-STUTTGART
·
2023
·Vol. 55
·期 20
·3393-3401
·
IF 2.6
Yue-Lu Zhu,Jie Yan,Xiu-Xuan Xu,Zong-Yu Sun,Jiao Chen
Copper-catalyzed coupling reaction involving N-phenoxyacetamides and 2H-azirines is described, in which N–O and C–N bonds are broken and restructured. This protocol provides an efficient strategy for the highly regioselective synthesis of racemic α-amino oxime ethers. In addition, this strategy can be used to modify natural products and is gram-scale compatible.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Long Liang,Chunli Wang,Mingan Ren,Shouliang Li,Zhijian Wu,Limin Wang,Fei Liang
The pivotal steps for the practical application of dehydrogenation of aluminum hydride (AlH3) have been to decrease the temperature and increase the content of AlH3. Herein, the initial dehydrogenation temperature of AlH3 decreased to 43 °C with the amount of released hydrogen of 8.3 wt % via introducing TiO2 and Pr6O11 with synergistic catalysis effects, and its apparent activation energy of the dehydrogenation reaction decreased to 56.1 kJ mol–1, which is 52% lower than that of pure AlH3. These differences in performances of the samples are further evaluated by determining the electron density of Al–H bonds during dehydrogenation. The multiple valence state conversions of TiO2 and Pr6O11 promoted the electron transfer of H in AlH3, and a novel dehydrogenation pathway of PrH2.37 formed simultaneously, which could accelerate the breakage of Al–H bonds. The density functional theory calculations further exhibit that there are fewer electrons around H in AlH3 and the Al–H bond energy is weaker at the atomic levels, which is more conducive to the release of hydrogen. A higher hydrogen storage capacity and a lower dehydrogenation temperature make AlH3 one of the most promising hydrogen source media for mobile applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 9
·6779-6785
·
IF 2.22
Wu Bao-Shui,Wang Peng,Song Jian
A mixed-solvothermal method was used to synthesize the α-Fe 2 O 3 nanoparticles with nearly spherical, rod-like, disk-like morphologies by varying the precipitant or solvent. When used as the anode material for Li-ion batteries, the nearly spherical α-Fe 2 O 3 nanoparticles with a high monodispersity and an average diameter of about 50.5 nm exhibited much better cycle stability and rate performance than their disk-like and rod-like equivalents. Their reversible capacity reached up to 1500 mAh/g that far exceeded their theoretical value (1007 mAh/g) at a current density of 0.1 A/g. Even after 100 cycles, there was still a capability retention of about 1200 mAh/g. Moreover, the analysis of the Nyquist plots revealed that the nearly spherical α-Fe 2 O 3 nanoparticles presented the lowest charge-transfer resistance among the three samples. The present study provides an effective way to control the morphologies of nanoparticles, and these nanostructures would present great potentials for the applications in LIBs or some other fields.
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