BioDesign Research
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2026
·
IF 7.2
Haidong Yu,Haofeng Chen,Guojun Yang,Zhen Huang,Jieming Zhou,Dongjiang Lin,Junru Zhao,Yang Zhang,Jifeng Yuan
1-Butanol is a C4 aliphatic alcohol that is widely used as a gasoline blendstock. In this study, we report an underexplored metabolic route for the de novo biosynthesis of 1-butanol in Escherichia coli . Specifically, the 1-butanol biosynthetic pathway comprises a redesigned Clostridium -derived pathway for butyryl-CoA synthesis, followed by a CoA-acylating aldehyde dehydrogenase (PduP from Salmonella enterica ) and an endogenous alcohol dehydrogenase (YqhD from E. coli ). We found that abolishing thioesterases to block the formation of butyrate byproduct would lead to deleterious effects on the cell growth. Upon introducing a metabolic buffering pathway towards polyhydroxyalkanoate biosynthesis, the toxicity caused by metabolic imbalance was alleviated, accompanied by enhanced cell growth and 1-butanol productivity. A similar strategy was also validated to be effective for improving the production of hexane-2,3-diol, a potential cosmetic component with high value. In summary, this work successfully demonstrates that the metabolic buffering strategy exerts a synergistic effect on enhancing biochemical production with improved carbon recovery efficiency.
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POLYMER
·
2026
·
IF 5.1
Huifang Ma,Famin Liu,Yaping Ma,Chenguang Liu,Aihua He
Developing new-generation inner-lining materials with enhanced resistance to high temperatures and chemical corrosion is urgent for industrial reactors operating under harsh conditions. In this work, controlled degradation of isotactic polybutene-1 (PB) samples with decreased weight-average molecular weight ( M w ) and narrowed molecular weight distribution ( M w / M n ), significantly increased melt flow rate (MFR) were achieved through peroxide induced chemical degradation. The degraded PB specimens exhibited minor structural moieties, including C C double bonds and –CH(CH 2 –CH 3 )–CH(CH 2 –CH 3 )- groups. Four reaction pathways were proposed to elucidate the microstructural evolution of degraded PB specimens. The degraded PB specimens presented almost constant isotacticity (mmmm = 93-95%), melting temperature ( T m = 124-131 °C), crystallinity ( X c = 44-49%), and lamellar thickness ( d c ) around 10-13 nm for PB form Ⅰ. The degraded PB-5 exhibited excellent coating processability, as well as excellent high-temperature properties. Compared with commercial film-grade high-density polyethylene (HDPE), PB-5 showed 59% higher tensile strength, 55% lower creep deformation, and 73% higher resistance to alkali at 85 °C. The blade-coated PB-5 film exhibited the highest surface smoothness and better water vapor barrier property when compared with that of pristine PB and HDPE. This work presented a feasible strategy for the fabrication of degraded PB-5 with superior coating processability and excellent high-temperature properties, which are expected to be used as inner lining materials of industrial reactors.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2026
·Vol. 37
·期 22
·1787
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IF 3.2
Zhang Qiuyang,Liu Guixiang,Dai Bo,Liu Kuan,Wang Wei,Ren Yong,Xu Fang
To satisfy the combined magnetic and dielectric requirements of electromagnetic materials for modern communication systems, (1- x )Y 3 Fe 5 O 12 - x BaTiO 3 (YIG-BTO) multiphase ceramics were prepared via a conventional ceramic processing method. The phase composition, element distribution, microstructure, and magnetic and dielectric properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), and a precision impedance analyzer. The results indicate that, at the microscale, the YIG and BTO phases coexist uniformly within the YIG-BTO composite ceramics. The microstructure, relative density, and grain size of the YIG-BTO ceramics are closely related to the BTO content, which in turn synergistically affects their magnetodielectric properties. For the 90 wt% YIG-10 wt% BTO ceramic sample with a relative density ( ρ r ) exceeding 95%, an optimal overall magnetodielectric performance is achieved. At 100 kHz, the initial permeability ( μ′ ) is 39.08, the magnetic loss ( tanδ μ ) is 0.1, the dielectric constant ( ε r ) is 29.32, the dielectric loss ( tanδ ε ) is 0.071, and the saturation magnetization ( 4πMs ) is 1563.67 Gs. This study provides a systematic theoretical basis for the practical application of the promising YIG-BTO multiphase material system.
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Journal of Physical Chemistry C
·
2018
·
IF 4.484
Fengjiao Chen,Guoyong Fang,Zhipeng Yan,Yuexiao Pan,Jianbo Liu,Lin Wang
The cation structural changes of two 1-butyl-3-methylimidazolium halides, [BMIM]Cl and [BMIM]Br, are investigated by in situ Raman spectroscopy, infrared spectroscopy, and synchrotron X-ray diffraction as a function of hydrostatic pressure. The [BMIM]+ cations of [BMIM]Cl take the TT conformation under ambient conditions, undergo significant changes at 3.4 GPa, which is related to the potential formations of some new cation conformations, and take another conformation from 6.8 to 35.6 GPa. Correspondingly, crystalline [BMIM]Cl has a structure transition at 3.4 GPa, originating directly from the cation conformational changes. The [BMIM]+ cations totally transform into the GT conformer, if the diamond anvil cell-loaded sample is treated at 423 K for 12 h in a furnace before being cooled down to room temperature. It is the first time to observe the complete conformational transition from one conformer (TT) to another (GT) for the [BMIM]+ salts in experiments. The cations preserve the GT conformation as pressure reaches 44.6 GPa for heat-treated [BMIM]Cl. As a comparison, without and with the heat treatment, the [BMIM]+ cations of [BMIM]Br keep the GT conformation at high pressures up to 29.6 GPa, as it is a relatively stable state. Moreover, a notable photoluminescence emerges at high pressures over 20.0 GPa and is maintained in the decompression process, as a result of the pressure-induced polymerization of a small portion of the [BMIM]+ cations.
研究领域:
物理化学
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材料科学
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高压物理
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离子液体
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光谱学
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MICROPOROUS AND MESOPOROUS MATERIALS
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2013
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IF 3.365
Xue Jiang,Zhuang Zhuang,Feng Xin
Highly b-oriented Titanium Silicalite-1 (TS-1) zeolite films were synthesized on polyvinyl acetate (PVAc) modified glasses by hydrothermal crystallization. The prepared samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR) and a contact-angle instrument. The results showed that the mass of PVAc on the glasses would influence the process of superficial nucleation and oriented growth of TS-1 films profoundly. A favorable amount of PVAc on smooth surface of glassy substrate was determined to form a highly b-oriented and fully covered TS-1 film by attracting appropriate precursor and template, then making TS-1 nucleate and grow orientedly. Based on the obtained results, a scheme of fabricating b-oriented TS-1 films was proposed.
研究领域:
材料科学
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无机化学
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薄膜制备
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沸石化学
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
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2017
·
IF 0.809
Shaohua Zhu,Yan Zhang,Peipei Li,Wenzhu Bi,Xiaolan Chen,Yufen Zhao
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Nature Communications
·
2026
·
IF 18.1
Du Yuxiang,Xiu Yueyue,Yang Xin,Fu Rui,Liu Dan,Liu Lipeng,Sai Huazheng
Aerogels exhibit excellent properties owing to their nano-sized building blocks and unique structures. With increasing application demands, traditional nanoscale building blocks have limitations in further optimizing the performance of aerogels; therefore, the development of novel, high-performance building blocks has become an urgent challenge in the field. Sub-1 nm nanowires (SNWs) exhibit polymer-like properties that make them superior to nanoscale nanowires, and are well-suited as new building blocks for aerogels. In this study, we achieved precise control over the aggregation state of GdOOH SNWs (Gd–SNWs) in three-dimensional space by regulating the interactions between SNWs as well as between SNWs and solvents, thereby obtaining SNW aerogels (SNWAs) with low density ( ~ 0.024 g cm −3 ) and high specific surface area (505 m 2 g −1 ). After silanization, the superhydrophobic SNWAs exhibited excellent fatigue resistance (50 cycles with a set strain of 50%). This innovative approach enriches the types of aerogels building blocks and opens up new avenues for high-performance aerogels.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
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IF 6.2
Yijie Li,Shun Zeng,Weinong Zhang,Junbo He,Jiangtao Feng
Peach brown rot, caused by Monilinia fructigena (M. fructigena), is a destructive disease that affects peaches during pre- and postharvest stages. In this study, two 1-O-alkylglycerols (AKGs), namely, AKG-2 (1-O-dodecylglycerol) and AKG-4 (3-(2-ethylhexyloxy)propane-1,2-diol), demonstrated significant in vitro antifungal activity against M. fructigena, with EC50 values of 102 and 103 μg/mL, respectively. At a concentration of 200 μg/mL, both compounds effectively suppressed brown rot symptoms in inoculated peaches, achieving a protective efficacy of 93.2%. Mechanistic investigations revealed that AKG-2 and AKG-4 disrupted the surface morphology and internal ultrastructure of fungal hyphae, compromised the integrity of the cell membrane and nucleus, and reduced mitochondrial membrane potential. Moreover, treatment with these compounds induced the accumulation of reactive oxygen species, leading to elevated malondialdehyde levels and decreased activities of key antioxidant enzymes including superoxide dismutase and catalase. These results suggest that AKG-2 and AKG-4 exhibit antifungal effects through multiple synergistic mechanisms including membrane and nuclear damage, mitochondrial dysfunction, and oxidative stress induction. This study, for the first time, provides valuable mechanistic insights into the antifungal effects of AKGs and supports their potential as naturally derived fungicidal agents for the protection of peach fruits.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 7
·3313-3319
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IF 2.93
Jing Lin,Fei Liang,Yaoming Wu,Wanqiang Liu,Limin Wang
We prepared Ti 1.4 V 0.6 Ni ribbons by arc-melting and subsequent melt-spinning techniques. Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 1.5, 2, 2.5 and 3, wt.%) composite alloys were obtained by the mechanical ball-milling method. The structures and hydrogen storage properties of alloys were investigated. Ti 1.4 V 0.6 Ni + x Mg composite alloys contained icosahedral quasicrystalline phase, Ti 2 Ni-type phase, β-Ti solid-solution phase and metallic Mg. The electrochemical and gaseous hydrogen storage properties of alloys were improved with Mg addition. Ti 1.4 V 0.6 Ni + 2 Mg alloy showed maximum electrochemical discharge capacity of 282.5 mAh g −1 as well as copacetic high-rate discharge ability of 82.3% at the discharge current density of 240 mA g −1 compared with that of 30 mA g −1 , and the cycling life achieved above 200 mAh g −1 after 50 consecutive cycles of charging and discharging. The hydrogen absorption/desorption properties of Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 2 and 3, wt.%) alloys were better than Ti 1.4 V 0.6 Ni. Ti 1.4 V 0.6 Ni + 3 Mg alloy also exhibited a favorable hydrogen absorption capacity of 1.53 wt.%. The improvement in the hydrogen storage characteristics caused by adding Mg may be ascribed to better hydrogen diffusion and anti-corrosion ability.
研究领域:
材料科学
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金属功能材料
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储能材料
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物理化学
·
电化学
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PEST MANAGEMENT SCIENCE
·
2023
·
IF 4.1
Yifan Li,Shujun Ni,Yunping Wang,Ruichi Li,Hong Sun,Xuan Ye,Zhen Tian,Yalin Zhang,Jiyuan Liu
BACKGROUND Insecticide resistance continuously poses a threat to agricultural production. Chemosensory protein-mediated resistance is a new mechanism of insecticide resistance discovered in recent years. In-depth research on resistance mediated by chemosensory proteins (CSPs) provides new insight into aid insecticide resistance management. RESULTS Chemosensory protein 1 in Plutella xylostella ( PxCSP1 ) was overexpressed in the two indoxacarb-resistant field populations and PxCSP1 has a high affinity with indoxacarb. PxCSP1 was upregulated when exposed to indoxacarb and the knockdown of this gene elevated sensitivity to indoxacarb, which demonstrate that PxCSP1 is involved in the indoxacarb resistance. Considering that CSPs may confer resistance in insects via binding or sequestering, we explored the binding mechanism of indoxacarb in PxCSP1 -mediated resistance. Using molecular dynamics simulations and site-directed mutation, we found that indoxacarb forms a solid complex with PxCSP1 mainly through van der Waals interactions and electrostatic interactions. Between these, the electrostatic interaction provided by the Lys100 side chain in PxCSP1 , and especially the hydrogen bonding between the NZ atom and the O of the carbamoyl carbonyl group of indoxacarb, are the key factors for the high affinity of PxCSP1 to indoxacarb. CONCLUSIONS The overexpression of PxCPS1 and its high affinity to indoxacarb is partially responsible for indoxacarb resistance in P. xylostella . Modification of indoxacarb's carbamoyl group has the potential to alleviate indoxacarb resistance in P. xylostella . These findings will contribute to solving chemosensory protein-mediated indoxacarb resistance and provide a better understanding of the insecticide resistance mechanism. © 2023 Society of Chemical Industry.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2022
·Vol. 120
·期 1
·e2209339120
·
IF 12.779
Fei Qiao,Yuedong He,Yuhao Zhang,Xuefei Jiang,Hanqing Cong,Zhiming Wang,Huapeng Sun,Yibei Xiao,Yucheng Zhao,Peter Nick
Cephalotaxines harbor great medical potential, but their natural source, the endemic conifer Cephalotaxus is highly endangered, creating a conflict between biotechnological valorization and preservation of biodiversity. Here, we construct the whole biosynthetic pathway to the 1-phenethylisoquinoline scaffold, as first committed compound for phenylethylisoquinoline alkaloids (PIAs), combining metabolic modeling, and transcriptome mining of Cephalotaxus hainanensis to infer the biosynthesis for PIA precursor. We identify a novel protein, ChPSS, driving the Pictet–Spengler condensation and show that this enzyme represents the branching point where PIA biosynthesis diverges from the concurrent benzylisoquinoline-alkaloids pathway. We also pinpoint ChDBR as crucial step to form 4-hydroxydihydrocinnamaldehyde diverging from lignin biosynthesis. The elucidation of the early PIA pathway represents an important step toward microbe-based production of these pharmaceutically important alkaloids resolving the conflict between biotechnology and preservation of biodiversity.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Yongdi He,Jinou Song,Yuan Zhuang,Yongfeng Liu,Jibiao Xie
In order to investigate the effects of 1- nitropropane ( 1- NP) on the pyrolysis of n- hexane , the pyrolysis processes of pure n- hexane and n- hexane/ 1- NP mixture in a jet-stirred reactor (JSR) were experimentally studied at atmospheric pressure with the technique of synchrotron ultraviolet photoionization mass spectrometry (SVUV-PIMS). The pyrolysis experiments of pure n- hexane and n- hexane/ 1- NP mixture were performed in the temperature ranges of 673–1143 K and 598–1128 K, respectively. The species pools for the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture were comprehensively determined and 25 species for pyrolysis of pure n- hexane versus 18 species for pyrolysis of n- hexane/ 1- NP mixture were identified. Based on the photoionization mass spectra scanned at different photon energies, the mole fraction profiles of all the pyrolysis species were evaluated. The experimental results showed that the initial pyrolysis temperature of n- hexane was observably reduced by 75 K with the addition of 1- NP, and the initial formation temperatures (IFTs) of some major pyrolysis products and important intermediates were correspondingly reduced. A high degree of conformity in the species pools of the pyrolysis of pure n- hexane and n- hexane/ 1- NP mixture (at both low and atmospheric pressures) was observed. On the basis of the experimental observations, modeling simulations and mechanisms proposed in previous studies, the low-temperature mechanisms for the 1- NP-initiated pyrolysis of n- hexane were discussed. A mechanism, including unimolecular dissociation reactions of 1- NP, radical reactions to produce highly active radicals, H-abstraction reactions of n- hexane and subsequent C-C bond dissociation reactions of hexyl radicals, was proposed.
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