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Corrosion mechanism of Zn-Al-Mg-coated steel in simulated polluted marine atmosphere

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Journal of Iron and Steel Research International 2024年第9期31卷 2294-2307页

作者： Pei-dong Ning Li-yuan Xiao Jin Wang qian-qian liu Kui Xiao Research Institute JISCO Hongxing Iron and Steel Co.Ltd.Jiayuguan735100GansuChina Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China

The corrosion behaviour of zinc–aluminium–magnesium-coated steel in a simulated polluted marine atmospheric environment was ***,an indoor ageing acceleration test was carefully designed by simulating a polluted marine *** objective was to in-depth investigate the corrosion mechanism of Zn–Al–Mg-coated steel exposed to a simulated polluted marine *** experiments were carried out by scanning electron microscopy for micro-morphological characterization,X-ray diffraction,electrochemical impedance spectroscopy and electrodynamic polarization curves for the aged *** analysis of the results obtained after an indoor accelerated ageing test shows that Zn–Al–Mg coatings generate insoluble Zn_(5)Cl_(2)(OH)_(8)·H_(2)O and Zn_(4)SO_(4)(OH)_(6)during the corrosion process,which hinders the diffusion of corrosive substances into the substrate,and the insoluble substances are structurally dense and thus inhibit further ***,this effectively inhibits the occurrence of further corrosion,and thus,Zn–Al–Mg coating can significantly extend the service life of Zn–Al–Mg-coated steel.

关键词： Zn-Al-Mg-coated steel Electrochemical impedance spectroscopy Polarization curve Atmospheric corrosion Marine atmosphere

PRODUCTION AND CHARACTERIZATION OF POLY(3-HYDROXYBUTYRATE-co-3-HYDROXYHEXANOATE)-POLY(ETHYLENE GLYCOL) HYBIRD COPOLYMER WITH ADJUSTABLE MOLECULAR WEIGHT

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Chinese Journal of Polymer Science 2012年第1期30卷 101-111页

作者： Ya—li Zhang Xiao-yun Lu qian-qian liu Ming-chuan Li Zhi-qian Yang Jian-gang Ma Department of Biological Science and Bioengineering Key Laboratory of Biomedicai Information Engineering of Ministry of Education School of Life Science and Technology Xi ＇an Jiaotong University Xi ＇an 710049 China

A novel natural-synthetic hybrid block copolymer was synthesized by Aeromonas hydrophila 4AK4 in poly（ethylene glycol）（PEG,M_n=200） modified *** hybrid biomaterial consists of the natural hydrophobic polymer poly（3-hydroxybutyrat-co-3-hydroxyhexanoate）（PHBHHx） end-capped with hydrophilic PEG,which has the increased flexibility as well as the improved thermal *** of diethylene glycol（DEG） and ethylene glycol could not result in the accumulation of hybrid block *** and ethylene glycol,together with PEG-200,could cause a reduction of molar mass of PHBHHx,resulting in a series of low molecular weight polymer and the reduction of the polymer yield as well as the cellular *** vitro degradation of PHBHHx and PHBHHx-PEG with different molecular weight showed that the decrease of molecular weight accelerated the degradation of copolymers,but PEG modification has little effect on its degradation *** results in this study provided a convenient and direct method to produce a series of PHBHHx and PHBHHx-PEG materials with adjustable molecular weight and broad molecular weight distribution which will be very useful for the biomedical applications.

关键词： Biopolyester Biodegradable Molecular weight Polyhydroxyalkanoates Polyethylene glycol

Tunable perpendicular anisotropic magnetoresistance in CoO/Co/Pt heterostructures

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Rare Metals 2023年第2期42卷 579-584页

作者： qian-qian liu Guang Yang Jing-Yan Zhang Guo-Nan Feng Chun Feng qian Zhan Ming-Hua Li Guang-Hua Yu Department of Materials Physics and Chemistry University of Science and Technology BeijingBeijing100083China

Transport properties of magnetron-sputtered CoO/Co/Pt heterostructures were investigated by physical property measurement *** types of magnetoresistance are observed in the heterostructures,including isotropic anisotropic magnetoresistance(AMR),AMR with geometric size effect,and interfacial effect.A reversal in sign of perpendicular AMR is found in the film CoO(3 nm)/Co(3 nm)/Pt(3 nm)compared to the film CoO(3 nm)/Co(3 nm)/CoO(3 nm),which is associated with ***,perpendicular AMR is tunable in the films CoO(3 nm)/Co(3 nm)/CoO(t)/Pt(3 nm)and CoO(3 nm)/Co(3 nm)/Pt(t)/CoO(3 nm)at will,with either positive or negative value,by varying the inserting layer *** electronic structure information of the samples was measured by X-ray photoelectron spectroscopy(XPS).The spin-related transport and XPS results manifest that magnetic proximity effect,surface scattering,together with oxygen migration contribute to the tunable function of Pt.

关键词： Perpendicular anisotropic magnetoresistance Magnetic proximity effect Surface scattering X-ray photoelectron spectroscopy

Enhancement of post-annealing stability in Co/Ni multilayers with perpendicular magnetic anisotropy by Au insertion layers

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Rare Metals 2016年第10期35卷 779-783页

作者： Yi Cao Ming-Hua Li Kang Yang Xi Chen Guang Yang qian-qian liu Guang-Hua Yu School of Materials Science and Engineering University of Science and Technology Beijing

Enhancement of post-annealing stability in Co/ Ni multilayers with perpendicular magnetic anisotropy （PMA） was obtained by inserting Au layers into Ni/Co interfaces. After annealing at 350 ℃, the effective mag- netic anisotropy density （Kef0 for Ta（3）/Pt（2）/[Co（0.3）/ Ni（0.6）/Au（0.3）]× 3/Co（0.3）/Pt（1）/Ta（3）（in nm） keeps at 0.48 × 105 J·m^-3. Scanning transmission electron micro- scopy-high-angle annular dark field （STEM-HAADF） analysis shows that the diffusion between Ni and Co layers is obstructed by the Au insertion layers among them, which is responsible for the post-annealing stability enhancement of the multilayers. Multilayers with Pt insertion layers were also investigated as reference samples in this work. Com- pared with Pt-layer-inserted Co/Ni multilayers, the Au insertion layers are found to bring seldom interfacial PMA to the multilayers, making it competitive in being employed to enhance the post-annealing stability of PMA Co/Ni multilayers which are used for magnetic random access memory devices （MRAM）.

关键词： Co/Ni multilayers Perpendicular magnetic anisotropy Post-annealing stability Au insertion layers

Root-derived long-distance signals trigger ABA synthesis and enhance drought resistance in Arabidopsis

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Journal of Genetics and Genomics 2024年第7期51卷 749-761页

作者： qian-qian liu Jin-Qiu Xia Jie Wu Yi Han Gui-Quan Zhang Ping-Xia Zhao Cheng-Bin Xiang Division of Life Sciences and Medicine Division of Molecular&Cell BiophysicsHefei National Science Center for Interdisciplinary Sciences at the MicroscaleUniversity of Science and Technology of ChinaThe Innovation Academy of Seed DesignChinese Academy of SciencesHefeiAnhui 230027China College of Life Sciences Anhui Agricultural UniversityHefeiAnhui 230036China College of Agronomy South China Agricultural UniversityGuangzhouGuangdong 510642China School of Biology and Basic Medical Sciences Soochow UniversitySuzhouJiangsu 215123China

Vascular plants have evolved intricate long-distance signaling mechanisms to cope with environmental stress,with reactive oxygen species(ROS)emerging as pivotal systemic signals in plant stress ***,the exact role of ROS as root-to-shoot signals in the drought response has not been *** this study,we reveal that compared with wild-type plants,ferric reductase defective 3(frd3)mutants exhibit enhanced drought resistance concomitant with elevated NINE-CIS-EPOXYCAROTENOID DIOXYGENASE 3(NCED3)transcript levels and abscisic acid(ABA)contents in leaves as well as increased hydrogen peroxide(H_(2)O_(2))levels in roots and *** experiments distinctly illustrate that drought resistance can be conferred by the frd3 rootstock regardless of the scion genotype,indicating that long-distance signals originating from frd3 roots promote an increase in ABA levels in ***,the drought resistance conferred by the frd3 mutant rootstock is weakened by the CAT2-overexpressing scion,suggesting that H_(2)O_(2)may be involved in long-distance ***,the results of comparative transcriptome and proteome analyses support the drought resistance phenotype of the frd3 *** together,our findings substantiate the notion that frd3 root-derived long-distance signals trigger ABA synthesis in leaves and enhance drought resistance,providing new evidence for root-to-shoot long-distance signaling in the drought response of plants.

关键词： frd3 Drought resistance Root-to-shoot long-distance signals Reactive oxygen species(ROS) H_(2)O_(2) Iron ABA

Melatonin combined with chondroitin sulfate ABC promotes nerve regeneration after root-avulsion brachial plexus injury

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Neural Regeneration Research 2019年第2期14卷 328-338页

作者： Wen-Lai Guo Zhi-Ping Qi Li Yu Tian-Wen Sun Wen-Rui Qu qian-qian liu Zhe Zhu Rui Li Department of Hand Surgery the Second Hospital of Jilin University Department of Orthopedics the Second Hospital of Jilin University Department of Ophthalmology the Second Hospital of Jilin University Department of Orthopedics China-Japan Union Hospital of Jilin University

After nerve-root avulsion injury of the brachial plexus, oxidative damage, inflammatory reaction, and glial scar formation can affect nerve regeneration and functional recovery. Melatonin(MT) has been shown to have good anti-inflammatory, antioxidant, and neuroprotective effects. Chondroitin sulfate ABC(ChABC) has been shown to metabolize chondroitin sulfate proteoglycans and can reduce colloidal scar formation. However, the effect of any of these drugs alone in the recovery of nerve function after injury is not completely satisfactory. Therefore, this experiment aimed to explore the effect and mechanism of combined application of melatonin and chondroitin sulfate ABC on nerve regeneration and functional recovery after nerve-root avulsion of the brachial plexus. Fifty-two Sprague-Dawley rats were selected and their C5–7 nerve roots were avulsed. Then, the C6 nerve roots were replanted to construct the brachial plexus nerve-root avulsion model. After successful modeling, the injured rats were randomly divided into four groups. The first group(injury) did not receive any drug treatment, but was treated with a pure gel-sponge carrier nerve-root implantation and an ethanol-saline solution via intraperitoneal(i.p.) injection. The second group(melatonin) was treated with melatonin via i.p. injection. The third group(chondroitin sulfate ABC) was treated with chondroitin sulfate ABC through local administration. The fourth group(melatonin + chondroitin sulfate ABC) was treated with melatonin through i.p. injection and chondroitin sulfate ABC through local administration. The upper limb Terzis grooming test was used 2–6 weeks after injury to evaluate motor function. Inflammation and oxidative damage within 24 hours of injury were evaluated by spectrophotometry. Immunofluorescence and neuroelectrophysiology were used to evaluate glial scar, neuronal protection, and nerve regeneration. The results showed that the Terzis grooming-test scores of the three groups that received tr

关键词： nerve regeneration nerve injury transitional zone chondroitin sulfate proteoglycan astrocyte motor neuron oxidative damage inflammatory response glial scar

Synthesis of dimeric butenolide catalyzed by various inorganic silver catalysts

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Traditional Medicine Research 2023年第6期8卷 33-38页

作者： Ruo-Meng Wei qian-qian liu Ying Li Wen-Jiao Yan Xiao-Ru Zhang Ai-Qin liu School of Pharmacy and Pharmaceutical Sciences Shandong First Medical UniversityJinan 250117China Institute of Materia Medica Shandong Academy of Medical SciencesJinan 250117China NHC Key Laboratory of Biotechnology Drugs(Shandong Academy of Medical Sciences) Jinan 250117China Key Lab for Rare&Uncommon Diseases of Shandong Province Jinan 250117China Department of Neurology Liaocheng Third People’s HospitalLiaocheng 252000China

This article describes a method for synthesizing butyrolactone dimers using various inorganic silver salt *** method was successfully applied to alkyl 2-(2-bromopropyl)malonate 1,providing the dimeric butyrolactone 2 when catalyzed by different silver salt *** synthesis method not only simplifies the original synthetic route,but also cleverly combines with natural product analogs,providing a strategy for the development of natural product polymer analogs in the future.

关键词： Mikania sesquiterpenes dimer toxicology silver catalysis

Verticillin A inhibits colon cancer cell migration and invasion by targeting c-Met

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第10期21卷 779-795页

作者： qian-qian liu Xue-li ZENG Yue-lin GUAN Jing-xin LU Kai TU Fei-yan liu Deparement of Internal Medicine Zhejiang University HospitalHangzhou 310027China Research Centre of Siyuan Natural Pharmacy and Biotoxicology College of Life SciencesZhejiang UniversityHangzhou 310058China

Verticillin A is a diketopiperazine compound which was previously isolated from Amanita flavorubescens Aik(containing parasitic fungi Hypomyces hyalines(Schw.)Tul.).Here,we initially found,by wound healing assay and Tran swell assay in vitro,that verticilli n A possesses an inhibitory effect agai nst the migrati on and in vasion of the human colon cancer ***,c-mesenchymal,epithelial transition factor(c-Met)was identified as a molecular target of verticillin A by screening key genes related to cell *** A-mediated c-Met suppress!on is at the transcriptio nal *** study dem on strated that verticilli n A suppressed c-MET phosphorylation and decreased c-MET protein *** addition,verticillin A inhibited the phosphorylation of c-MET downstream molecules including rat sarcoma(Ras)-associated factor(Raf),extracellular signal-regulated kinase(ERK),and protein kinase B(AKT).Overexpression of Erk partially reversed the verticillin A-mediated anti-metastasis action in the human colon cancer *** importantly,verticillin A also inhibited cancer cell metastasis in ***,verticillin A can significantly inhibit the migration and invasion of colon cancer cells by targeting c-Met and inhibiting Ras/Raf/mitogen-activated extracellular signal-regulated kinase(MEK)/ERK signaling ***,we determined that verticillin A is a natural compound that can be further developed as an anti-metastatic drug in human cancers.

关键词： Verticillin A Colon cancer Migration Invasion c-Mesenchymal-epithelial transition factor(c-MET)

A gain-of-function mutation of the MATE family transporter DTX6 confers paraquat resistance in Arabidopsis

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Molecular Plant 2021年第12期14卷 2126-2133页

作者： Jin-Qiu Xia Tahmina Nazish Ayesha Javaid Mohsin Ali qian-qian liu Liang Wang Zheng-Yi Zhang Zi-Sheng Zhang Yi-Jie Huang Jie Wu Zhi-Sen Yang Lin-Feng Sun Yu-Xing Chen Cheng-Bin Xiang School of Life Sciences Division of Molecular&Cell BiophysicsHefei National Science Center for Physical Sciences at the MicroscaleMOE Key Laboratory for Membraneless Organelles and Cellular DynamicsUniversity of Science and Technology of ChinaThe Innovation Academy of Seed DesignChinese Academy of SciencesHefeiAnhui Province 230027China

Paraquat is one of the most widely used nonselective herbicides and has elicited the emergence of para-quat-resistant ***,the molecular mechanisms of paraquat resistance are not completely *** we report the Arabidopsis gain-of-function mutant pqt15-D with significantly enhanced resistance to paraquat and the corresponding gene PQT15,which encodes the Multidrug and Toxic Extru-sion(MATE)transporter DTX6.A point mutation at+932 bp in DTX6 causes a G311E amino acid substitution,enhancing the paraquat resistance ofpqt15-D,and overexpression of DTX6/PQT15 in the wild-type plants also results in strong paraquat ***,heterologous expression of DTX6 and DTX6-D in Es-cherichia coil significantly enhances bacterial resistance to ***,overexpression of DTX6-D enables Arabidopsis plants to tolerate 4 mM paraquat,a near-commercial application ***6/PQT15 is localized in the plasma membrane and endomembrane,and functions as a paraquat efflux transporter as demonstrated by paraquat efflux assays with isolated protoplasts and bacterial *** together,our results demonstrate that DTX6/PQT15 is an efflux transporter that confers paraquat resis-tance by exporting paraquat out of the *** findings reveal a molecular mechanism of paraquat resistance in higher plants and provide a promising candidate gene for engineering paraquat-resistant crops.

关键词： paraquat paraquat resistance DTX/MATE transporter subfamily AtDTX6/PQT15