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Metabolic responses to combined water deficit and salt stress in maize primary roots

Journal of Integrative Agriculture 2021年第1期20卷 109-119页

作者： LI Peng-cheng yang xiao-yi WANG Hou-miao PAN Ting yang Ji-yuan WANG Yun-yun XU yang yang Ze-feng XU Chen-wu Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Agricultural CollegeYangzhou UniversityYangzhou 225009P.R.China Jiangsu Co-Innovation Center for Modern Production Technology o f Grain Crops Yangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry o f Education/yangzhou University Yangzhou 225009P.R.China

Soil water deficit and salt stress are major limiting factors of plant growth and agricultural productivity. The primary root is the first organ to perceive the stress signals for drought and salt stress. In this study, maize plant subjected to drought, salt and combined stresses displayed a significantly reduced primary root length relative to the control plants. GC-MS was used to determine changes in the metabolites of the primary root of maize in response to salt, drought and combined stresses. A total of 86 metabolites were measured, including 29 amino acids and amines, 21 organic acids, four fatty acids, six phosphoric acids, 10 sugars, 10 polyols, and six others. Among these, 53 metabolites with a significant change under different stresses were identified in the primary root, and the content of most metabolites showed down-accumulation. A total of four and 18 metabolites showed significant up-and down-accumulation to all three treatments, respectively. The levels of several compatible solutes, including sugars and polyols, were increased to help maintain the osmotic balance. The levels of metabolites involved in the TCA cycle, including citric acid, ketoglutaric acid, fumaric acid, and malic acid, were reduced in the primary root. The contents of metabolites in the shikimate pathway, such as quinic acid and shikimic acid, were significantly decreased. This study reveals the complex metabolic responses of the primary root to combined drought and salt stresses and extends our understanding of the mechanisms involved in root responses to abiotic tolerance in maize.

关键词： maize primary root combination stress drought high salt stress metabolomics

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Deposition and characterization for high-quality Ti-Ni-Cu thin films with higher Cu content

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Rare Metals 2021年第8期40卷 2127-2133页

作者： Jun Li xiao-yang yi Yu Zheng Jing Wang Hai-Zhen Wang Xiang-Long Meng Zhi-Yong Gao Yue-Hui Ma College of Mechanical and Electrical Engineering Northeast Forestry University150001HarbinChina School of Materials Science and Engineering Harbin Institute of Technology150001HarbinChina Lanzhou Seemine SMA Co.Ltd 730010LanzhouChina

In order to attain high-quality Ti-Ni-Cu film,the surface morphologies,chemical compositions and mechanical properties of Ti-Ni-Cu thin films prepared by direct current(DC)magnetron sputtering at various processes were characterized by scanning electron microscopy(SEM),X-ray diffractometer(XRD)and tensile *** type of substrates,Ar pressure and sputtering power had significant effects on the quality and chemical composition of Ti-Ni-Cu thin *** with Si and SiO_(2) slides,it was easier to obtain freestanding films by adopting glass or piezoid slide as *** Ti-Ni-Cu thin film deposited at lower pressure(0.10 Pa)had a better *** surface was featured with porous structure in the Ti-Ni-Cu thin film prepared by higher Ar pressure of 0.36 *** addition,both the tensile strength and strain of annealed Ti-Ni-Cu thin film continuously increased with Ar pressure *** density contributed to the superior mechanical *** deposition rate firstly increased and then decreased with Ar pressure and sputtering power *** composition of deposited Ti-Ni-Cu film can be tailored by changing sputter *** deposited Ti-Ni-Cu thin films at different processing parameters were in amorphous *** short,the present study offered the important theoretical basis for the preparation of Ti-Ni-Cu thin film with higher quality and performance.

关键词： Ti-Ni-Cu thin film DC magnetron sputtering Sputtering parameters Chemical composition Surface morphology

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Effect of Sn Content on the Microstructural Features, Martensitic Transformation and Mechanical Properties in Ti-V-Al-Based Shape Memory Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第8期36卷 1247-1260页

作者： xiao-yang yi Wei Liu Yun-Fei Wang Bo-Wen Huang Xin-Jian Cao Kui-Shan Sun xiao Liu Xiang-Long Meng Zhi-Yong Gao Hai-Zhen Wang Department of Nuclear Equipment College of Nuclear Equipment and Nuclear EngineeringYantai UniversityYantai264005China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai264005China

In the present study, it is expected to tailor the microstructural features, martensitic transformation temperatures and mechanical properties of Ti-V-Al shape memory alloys through adding Sn alloying elements, which further expands their applications. Sn addition results in the monotonous rising of average valence electron number (e/a). In proportion, the single α″ martensite phase directly evolves into merely β parent phase in present Ti-V-Al-based shape memory alloys, as Sn content increases from 0.5 to 5.0 at.%. Meanwhile, Sn addition causes the reduction in the grain size. Combined with transmission electron microscopy (TEM) observation and d electron theory analysis, it can be speculated that Sn addition can suppress the precipitation of ω phase. With increasing Sn content, fracture strength invariably decreases from 962 to 792 MPa, whereas the yield strength firstly decreases and then increases. The lowest yield stress for the stress-induced martensitic transformation of 220 MPa can be obtained in Ti-V-Al shape memory alloy by adding 3.0 at.% Sn. By optimizing 1.0 at.% Sn, the excellent ductility with a largest elongation of 42.1% can be gained in Ti-V-Al shape memory alloy, which is larger than that of the reported Ti-V-Al-based shape memory alloys. Besides, as a result of solution strengthening and grain refinement, Ti-V-Al-based shape memory alloy with 5.0 at.% Sn possesses the highest yield strength, further contributing to the excellent strain recovery characteristics with 4% fully recoverable strain.

关键词： Ti-V-Al alloy Lightweight shape memory alloy Microstructural features Mechanical properties strain recoverycharacteristics

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Effect of chronic intermittent hypoxia on theophylline metabolism in mouse liver

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Chinese Medical Journal 2013年第1期126卷 118-123页

作者： CHEN xiao-yang ZENG yi-ming ZHANG yi-xiang WANG Wan-yu WU Run-hua Department of Pulmonary Medicine Second Clinical MedicalCollege of Fujian Medical University Quanzhou Fujian 362000China

Background Chronic intermittent hypoxia （CIH） has been associated with abnormalities in the liver, which is the most important organ for drug metabolism. This study aimed to investigate the effect of CIH on theophylline metabolism in mouse liver. Methods Eight C57BL/6J mice were exposed to CIH for 12 weeks. Eight C57BL/6J mice were exposed to room air as a control group. Serum levels of alanine aminotransferase and aspartate aminotransferase were measured. Liver histology was observed by light and electron microscopy. Total hepatic cytochrome P450 concentration was measured. Hepatocytes were isolated and incubated with 15 mg/ml theophylline for four hours. After incubation, the theophylline concentration in the supernatant was measured and the theophylline metabolism rate was calculated. Results CIH did not affect the serum transaminase levels. Livers from mice exposed to CIH showed hepatocellular edema, and liver cells had fuzzy rough endoplasmic reticulum under the electron microscope. The theophylline metabolism rate was significantly inhibited by CIH compared with controls; （16.60±2.43）% vs. （21.58±4.52）% （P=0.02）. The total liver cytochrome P450 concentration in the CIH group was significantly lower than in the control group; （0.83±0.08） vs. （1.13±0.21）mol/mg microsomal protein （P=0.004）. Conclusion CIH decreases theophylline metabolism by mouse hepatocytes, which may correlate with the downregulation of cytochrome P450 expression by CIH.

关键词： hypoxia liver metabolism sleep apnea syndrome theophylline

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基于蒙特卡罗模拟的土壤环境健康风险评价:以PAHs为例

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环境科学 2017年第6期38卷 2522-2529页

作者：佟瑞鹏杨校毅中国矿业大学(北京)资源与安全工程学院北京100083

为获得更为合理的健康风险评价结果,并辨识对健康风险影响最大的因素,基于蒙特卡罗随机模拟,运用概率风险评价模型,定量评估了中国上海某居民区土壤中16种PAHs对居民的健康风险水平,并对各参数进行敏感性分析.结果表明,土壤中PAHs造成... 详细信息

为获得更为合理的健康风险评价结果,并辨识对健康风险影响最大的因素,基于蒙特卡罗随机模拟,运用概率风险评价模型,定量评估了中国上海某居民区土壤中16种PAHs对居民的健康风险水平,并对各参数进行敏感性分析.结果表明,土壤中PAHs造成的健康风险服从对数正态分布,总的致癌风险为3.43×10^(-5)±2.63×10^(-5),最小值为8.10×10^(-7),最大值为2.39×10^(-4),超过10-6的概率为95%,超过10^(-5)的概率为75%,超过10^(-4)的概率小于5%;总的危害商为4.74×10^(-2)±3.42×10^(-2),不超过1,风险较小;在7种具有致癌效应的PAHs中,苯并(a)芘、二苯并(a,h)蒽和苯并(a)蒽是总致癌风险的主要贡献物质,贡献率分别占60.41%、26.84%和6.56%;3种暴露途径中,经口途径是造成致癌风险的主要途径,贡献率为73.22%;对于总致癌风险,人体暴露参数中每日土壤摄入量、暴露周期、暴露皮肤面积敏感度较大,分别为58.35%、50.21%和20.51%;体重具有负敏感性,敏感度为-11.66%.

关键词：土壤多环芳烃健康风险评价概率风险模型蒙特卡罗模拟

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齿轨轮齿形曲面及倒角数控精加工研究

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煤矿机械 2013年第2期34卷 137-139页

作者：杨小毅西安煤矿机械有限公司西安710032

阐述了采煤机齿轨轮数控精加工的基本过程,详细分析了三轴联动数控精加工齿形曲面和倒角的原理以及存在的问题,总结了试切过程中发现的不足之处,经过研究找出了改进提高加工效率和质量的方法,为实际生产工艺改进指出了方向。

关键词：齿轨轮倒角数控精加工

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Sudden cardiovascular collapse caused by carbon dioxide embolism during endoscopic saphenectomy for coronary artery bypass grafting

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Chinese Medical Journal 2006年第4期119卷 345-348页

作者： CHEN Xin-chun TANG xiao-yang JIANG yi-fan PAN Yan-bing FU Cheng-zhang Department of Anesthesia First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China

Endoscopic vein harvesting （EVH） for coronary artery bypass grafting （CABG） has gained increasing acceptance as a less invasive alternative to conventional open vein harvesting. With this procedure, carbon dioxide （CO2） is insufflated to create a subcutaneous tunnel to facilitate the harvest of the great saphenous vein. The technique seems to be safe because there are no adverse hemodynamic consequences or systemic CO2 absorption during EVH. We report a case of massive right heart gas embolism which occurred during a routine EVH performance of the saphenous vein. Techniques for early diagnosis of this rare but life-threatening complications, transesophageal echocardiography （TEE） is a sensitive tool in detecting CO2 embolism [except end-tided CO2 （ETCO2）] and pulmonary arterial pressure （PAP） monitoring. The rapid recovery of CO2 embolism in the patient who underwent EVH with CO2 insufflation and CABG surgery was due to immediate and accurate diagnosis and prompt treatment.

关键词： anesthesia coronary artery bypass grafting carbon dioxide

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孙复对《公羊》学的继承与发展

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湖南大学学报（社会科学版） 2019年第2期33卷 40-46页

作者：吴仰湘杨潇沂湖南大学岳麓书院湖南长沙410082

有关孙复的研究多集中于舍传求经的方面,忽略了继承三传的方面。其实,孙复的《春秋》学与《公羊》关系密切。他认为孔子作六经为万世立法,且推崇董仲舒、批评刘歆。他的《春秋尊王发微》在方法上继承了《公羊》学重义略事、属辞比事、... 详细信息

有关孙复的研究多集中于舍传求经的方面,忽略了继承三传的方面。其实,孙复的《春秋》学与《公羊》关系密切。他认为孔子作六经为万世立法,且推崇董仲舒、批评刘歆。他的《春秋尊王发微》在方法上继承了《公羊》学重义略事、属辞比事、以例言经的思路;思想上继承了《公羊》尊王、恶盟、天人感应、讥世卿等思想,改造了《公羊》君臣之分与三世说。孙复对《公羊》学的继承与发展,启发对宋代《春秋》学、历代《公羊》学书写的进一步思考。

关键词：孙复《春秋尊王发微》宋代《公羊》学以例言经尊王

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航空发动机风扇机匣包容性等效试验与分析方法

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振动与冲击 2016年第2期35卷 162-167页

作者：柴象海张晓云侯亮杨宵毅中航商用航空发动机有限责任公司上海200241 上海商用飞机发动机工程技术研究中心上海200241 上海交通大学机械与动力工程学院上海200240

针对硬壁机匣包容性问题,提出在发动机研制初期,通过风扇包容机匣等效试验件靶板冲击试验,模拟真实风扇叶片脱落机匣包容性过程,并通过材料高应变率试验拟合机匣材料在高应变率下的本构模型;建立基于简化试验结果的数值仿真模型标定及... 详细信息

针对硬壁机匣包容性问题,提出在发动机研制初期,通过风扇包容机匣等效试验件靶板冲击试验,模拟真实风扇叶片脱落机匣包容性过程,并通过材料高应变率试验拟合机匣材料在高应变率下的本构模型;建立基于简化试验结果的数值仿真模型标定及机匣包容性分析模型修正方法,对风扇叶片脱落机匣包容性分析模型进行标定,建立高精度风扇机匣包容性仿真预测模型,用于风扇叶片脱落适航取证试验前仿真预测,以提高试验成功率、减少试验次数。通过数值仿真可拟合获得机匣包容厚度与叶片脱落载荷的关系,为风扇包容机匣设计提供厚度参数输入参考。

关键词：航空发动机包容机匣等效试验数值仿真分析

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基于语料库的英语文章语法错误检查及纠正方法

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北京邮电大学学报 2016年第4期39卷 92-97页

作者：谭咏梅王晓辉杨一枭北京邮电大学智能科学与技术中心

提出一种基于语料库的规则自动抽取方法,在此基础上提出了有限回退算法对英语文章进行语法错误检查及纠正.该方法在2013年Co NLL语法自动检查及纠正评测数据上总体F1为31.96%,超过第1名的31.20%,在冠词错误的纠正方面F1为33.45%,超过201... 详细信息

提出一种基于语料库的规则自动抽取方法,在此基础上提出了有限回退算法对英语文章进行语法错误检查及纠正.该方法在2013年Co NLL语法自动检查及纠正评测数据上总体F1为31.96%,超过第1名的31.20%,在冠词错误的纠正方面F1为33.45%,超过2013年最好成绩33.40%,在名词错误的纠正方面F1为45.31%,超过2013年最好成绩44.35%.

关键词：语料库自动规则抽取有限回退错误检查及纠正

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