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Journal of Iron and Steel Research International 2015年第4期22卷 324-329页

作者： xiao-juan ZHEN Pei-qing LA Cui-ling LI Su-lei HU State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology

A simple method was developed to produce the nanocrystalline pure iron by aluminothermic reaction cast- ing. The mierostructure of the iron was investigated by optical microseope （OM）, transmission electron microscope （TEM）, electron probe micro-analyzer （EPMA）, scanning electron microscope （SEM） and X-ray diffraction （XRD）. The mechanical performances of nanoerystalline pure iron were tested. It is found that the pure iron consists of nanoerystalline ferrite. For different substrates of eopper and glass, the average grain size of the ferrite was 38 and 35 nm, respectively, which is larger on copper substrate than that on glass. The hardness, compressive strength, tensile strength, and total elongation are 167 and 137 HB, 400 and 500 MPa, 243 and 185 MPa, 16% and 10% on copper substrate and glass suhstrate, respectively. The hardness, tensile strength and total elongation are all larger on copper substrate than those on glass substrate, while the eompressive strength is lower. The large supercooling in the product solidification provides the condition for high nucleation rate and thus leads to nano-grained austenite and final nano-grained ferrite transformed from those small austenite grains.

关键词： nanocrystalline aluminothermic reaction casting pure iron substrate microstructure mechanical property

Effects of Glycerol on the Fluorescence Spectra and Chloroplast Ultrastructure of Phaeodactylum tricornutum(Bacillariophyta)

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Journal of Integrative Plant Biology 2009年第3期51卷 272-278页

作者： xiao-juan Liu Shun-Shan Duan Ai-Fen Li Kai-Feng Sun Institute of Hydrobiology Jinan University Guangzhou 510632 China College of Food Science South China Agricultural University Guangzhou 510632 China

Responses of the photosynthetic activity of Phaeodactylum tricornutum （Bacillariophyta） to organic carbon glycerol were investigated. The growth rate, photosynthetic pigments, 77 K fluorescence spectra, and chloroplast ultrastructure of P. tricornutum were examined under photoautotrophic, mixotrophic, and photoheterotrophic conditions. The results showed that the specific growth rate was the fastest under mixotrophic conditions. The cell photosynthetic pigment content and values of Chl a/Chl c were reduced under mixotrophic and photoheterotrophic conditions. The value of carotenoid/Chl a was enhanced under mixotrophic conditions, but was decreased under photoheterotrophic conditions. In comparison with photoautotrophic conditions, the fluorescence emission peaks and fluorescence excitation peaks were not shifted. The relative fluorescence of photosystem （PS） Ⅰ and PS Ⅱ and the values of F685/F710 and F685/F738 were decreased. Chloroplast thylakoid pairs were less packed under mixotrophic and photoheterotrophic conditions. There was a strong correlation between degree of chloroplast thylakoid packing and the excitation energy kept in PS Ⅱ. These results suggested that the PS Ⅱ activity was reduced by glycerol under mixotrophic conditions, thereby leading to repression of the photosynthetic activity.

关键词： chloroplast ultrastructure fluorescence glycerol mixotrophic Phaeodactylum tricornutum photoautotrophic photoheterotrophic photosynthetic activity pigment.

Lymph node regression grading of locally advanced rectal cancer treated with neoadjuvant chemoradiotherapy

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World Journal of Gastrointestinal Oncology 2022年第8期14卷 1429-1445页

作者： Lei He juan xiao Ping Zheng Lei Zhong Qian Peng School of Medicine University of Electronic Science and Technology of ChinaChengdu 611731Sichuan ProvinceChina Department of Pathology Sichuan Cancer Hospital&InstituteSichuan Cancer CenterSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 610041Sichuan ProvinceChina Personalized Drug Therapy Key Laboratory of Sichuan Province Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengdu 610072Sichuan ProvinceChina Radiation Therapy Center Sichuan Cancer Hospital&InstituteSichuan Cancer CenterSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 610041Sichuan ProvinceChina

Neoadjuvant chemoradiotherapy(nCRT)and total rectal mesenteric excision are the main standards of treatment for locally advanced rectal cancer(LARC).Lymph node regression grade(LRG)is an indicator of prognosis and response to preoperative nCRT based on postsurgical metastatic lymph node *** histopathological findings in metastatic lymph nodes after nCRT include necrosis,hemorrhage,nodular fibrosis,foamy histiocytes,cystic cell reactions,areas of hyalinosis,residual cancer cells,and pools of mucin.A number of LRG systems designed to classify the amount of lymph node regression after nCRT is mainly concerned with the relationship between residual cancer cells and regressive fibrosis and with estimating the number of lymph nodes existing with residual cancer *** offers significant prognostic information,and in most cases,LRG after nCRT correlates with patient *** this review,we describe the systematic classification of LRG after nCRT,patient prognosis,the correlation with tumor regression grade,and the typical histopathological findings of lymph *** work may serve as a reference to help predict the clinical complete response and determine lymph node regression in patients based on preservation strategies,allowing for the formulation of more accurate treatment strategies for LARC patients,which has important clinical significance and scientific value.

关键词： Lymph node regression grade Histopathological Rectal cancer Chemoradiotherapy Treatment response Neoadjuvant therapy

Screening of a Composite Microbial System and Its Characteristics of Wheat Straw Degradation

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Agricultural Sciences in China 2011年第10期10卷 1586-1594页

作者： LI Pei-pei WANG xiao-juan YUAN Xu-feng WANG xiao-fen CAO Yan-zuan CUI Zong-jun College of Agronomy and Biotechnology China Agricultural University Beijing 100193 P.R.China

To accelerate the decomposition of wheat straw directly returned to soil, we constructed a microbial system （ADS-3） from agricultural soil containing rotting straw residues using a 40-wk limited cultivation. To assess its potential use for accelerating straw decomposing, the decomposing characteristics and the microbial composition of ADS-3 were analyzed. The results indicated that it could degrade wheat straw and filter paper by 63.8 and 80%, respectively, during 15 d of incubation. Straw hemicellulose degraded dramatically 51.2% during the first 3 d, decreasing up to 73.7% by the end of incubation. Cellulose showed sustained degradation reaching 53.3% in 15 d. Peak values of xylanase and cellulase activities appeared at 3 and 11 d, with 1.32 and 0.15 U mL-1, respectively. Estimated pH averaged 6.4-7.6 during the degradation process, which approximated acidity and alkalinity of normal soils. The microbial composition of ADS-3 was stable based on denaturing gradient gel electrophoresis （DGGE） analysis. By using bacterial 16S rRNA and fungal 26S rRNA gene clone library analysis, 20 bacterial clones and 7 fungal clones were detected. Closest identified relatives of bacteria represented by Bacillus fusiformis, Cytophaga sp., uncultured Clostridiales bacterium, Ruminobacillus xylanolyticum, Clostridium hydroxybenzoicum, and uncultured proteobacterium and the fungi were mainly identified as related to Pichia sp. and uncultured fungus.

关键词： wheat straw degradation composite microbial system cellulose hemicelulose cellulase xylanase microbial composition

Chaos Synchronization in Two Coupled Duffing Oscillators

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Chinese Physics Letters 2001年第11期18卷 1438-1441页

作者： FANG Jian-Shu FANG Zhuo LIU xiao-juan RONG Man-Sheng Department of Physics Zhuzhou Teacher's CollegeZhuzhou 412007 The Key Laboratory of Biomedical Photonics Huazhong University of Science and TechnologyWuhan 430074 Department of Physics Xiangtan Teacher's CollegeXiangtan 411017

We have obtained two general unstable periodic solutions near the homoclinic orbits of two coupled Duffing oscillators with weak periodic perturbations by using the direct perturbation technique. Theoretical analysis reveals that the stable periodic orbits are embedded in the Melnikov chaotic attractors. The corresponding numerical results show that the phase portraits in the (x, u) and (y, v) planes are identical and are synchronized when the parameters of the two coupled oscillators are identical, but they are different and asynchronized when there is any difference between these parameters. It has been shown that the system parameters play a very important role in chaos control and synchronization.

关键词： technique. periodic identical

Expression and function of CXCR2,CXCR7 of acute leukemic cells in rat

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Asian Pacific Journal of Tropical Medicine 2014年第5期7卷 417-420页

作者： Yuan-Lu Huang xiao-Li Liu Na Xu Ya-juan xiao Guan-Lun Gao Hematological Department Nanfang HospitalSouthern Medical University

Objective:To investigate the expression and function of chernokine receptor CXCR2 and CXCR7in the rat with acute ***:Flow cytometry and RT-PCR were used to detect the CXCR2,CXCR7 expression on the bone marrow cell surface of the acute leukemia group and the control ***:The bone marrow cell surface CXCR2,CXCR7 relative fluorescence intensity of the observation group was significantly higher than the control group(P<0.05).The CXCR7 expression of the extramedullary infiltration group was significantly higher than nonextramedullary infiltration group(P<0.05).The CXCR2,CXCR7mRNA median expression level of the observation group was higher than the control *** CXCR2 expression and CXCR7expression of the observation group was positively correlated,and the correlation coefficient was0.782(P<0.01).CondiBions:The chernokine receptor CXCR2 and CXCR7 are highly expressed in acute leukemia,which may be associated with the occurrence of leukemia.

关键词： Acute leukemia CXCR2 CXCR7 Flow cytometry RT-PCR

Attitude maneuver of liquid-filled spacecraft with a flexible appendage by momentum wheel

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Acta Mechanica Sinica 2012年第2期28卷 543-550页

作者： Dan-Dan Yang Bao-Zeng Yue Wen-Jun Wu xiao-juan Song Le-Mei Zhu Department of Mechanics School of Aerospace EngineeringBeijing Institute of Technology100081 BeijingChina

Attitude maneuver of liquid-filled spacecraft with an appendage as a cantilever beam by momentum wheel is studied. The dynamic equations are derived by conserva- tion of angular momentum and force equilibrium principle. A feedback control strategy of the momentum wheel is ap- plied for the attitude maneuver. The residual nutation of the spacecraft in maneuver process changes with some chosen parameters, such as steady state time, locations of the liq- uid container and the appendage, and appendage parame- ters. The results indicate that locations in the second and fourth quadrants of the body-fixed coordinate system and the second quadrant of the wall of the main body are better choices *** the liquid containers and the appendage than other locations if they can be placed randomly. Higher density and thicker cross section are better for lowering the residual nutation if they can be changed. Light appendage can be modeled as a rigid body, which results in a larger residual nutation than a flexible model though. The resid- ual nutation decreases with increasing absolute value of the initial sloshing angular height.

关键词： Liquid-filled spacecraft Appendage Attitude maneuver Momentum wheel Steady state time Residual nutation

Antifungal Activity of Chitosan on Fusarium sulphureum in Relation to Dry Rot of Potato Tuber

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Agricultural Sciences in China 2009年第5期8卷 597-604页

作者： LI Yong-cai SUN xiao-juan BI Yang GE Yong-hong WANG Yi College of Food Science and Engineering Gansu Agricultural University Lanzhou 730070 P.R.China

The antifungal activity of chitosan on Fusarium sulphureum in relation to the inhibitory effect on dry rot of potato tuber was investigated. The results showed spore germination and mycelial growth of F. sulphureum were inhibited by chitosan treatment and the inhibitory effect was highly correlated with chitosan concentration used in this study. Morphological changes such as intertwisting hyphal, distortion, and swelling with excessive branching were observed by scanning electron microscopy （SEM） observation. Transmission electron microscopy （TEM） observation further indicated the ultrastructural alterations of hyphae. These changes included abnormal distribution of cytoplasma, non-membraneous inclusion bodies assembling in cytoplasm, considerable thickening of the hyphal cellular walls, and very frequent septation with malformed septa. Application of chitosan at higher concentration caused serious damage to fungal hyphae, including cellular membrane disorganisation, cell wall disruption, and breaking of inner cytoplast. New hyphae （daughter hyphae） inside the collapsed hyphal cells was often detected in the cytoplasm of chitosan-treated hyphae. In vivo tests showed that chitosan treatment at 0.5 or 1% effectively controlled the dry rot of potato tuber inoculated with a spore suspension ofF. sulphureum. However, the chitosan treatment at 1% caused phytotoxicity to potato tuber. This study suggests that the use of chitosan could be a promising handling as a natural fungicide to partially substitute for the synthetic fungicides in potato tuber.

关键词： chitosan Fusarium sulphureum morphology and ultrastructure potato dry rot

A Scheme of Conditional Quantum Phase Gate for Dissipative Cavity QED System

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Communications in Theoretical Physics 2006年第6X期46卷 983-986页

作者： CAI Jian-Wu FANG Mao-Fa LIAO Xiang-Ping ZHENG xiao-juan College of Physics and Information Science Hunan Normal University Changsha 410081 China Department of Physics and Electronics Zhuzhou Teacher's College Zhuzhou 412007 China School of Physical Science and Tcchnology Central South University Changsha 410082 China

We propose a scheme to implement a two-qubit conditional quantum phase gate via a single mode cavity and a cascade four-level atom assisted by a classical laser. The quantum information is *** the Flock states of the cavity mode and the two metastable ground states of the atom. Even under the condition of systematic dissipations, this scheme can also be realized with fidelity of 98.6% and success probability of 0.767.

关键词： quantum phase gate single cavity mode cascade four-level atom dissipation fidelity

A Novel Total Synthesis of (±)Shikonin

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Chinese Chemical Letters 2006年第7期17卷 871-873页

作者： De Feng XU xiao juan GUO Zhao Hui XU Shao Shun LI School of Pharmacy Shanghai Jiaotong University Shanghai 200030

A novel total synthesis of （±）shikonin 1 was presented. The key intermediate 6 was achieved by the formylation of 1,8：4,5-bis（methylenedioxy）naphthalene 5 with N-methylformanilide in good yield. It was first reported that the addition of prenyllithium to 2-formyl-1,8：4,5- bismethylenedioxy naphthalene 6 gave 2-（1-hydroxy-4-methylpentyl） 1,8：4,5-bis（methylenedioxy） naphthalene 8 in 45% yield and 2-（1-hydroxy-2,2-dimethyl-3-butenyl）-1,8：4,5-bis（methylenedioxy）naphthalene 9 in 48% yield. After the electrooxide deprotection of 8, （±）shikonin 1 was prepared in high yield.

关键词： (±)Shikonin total synthesis prenyllithium.