检索结果-南通市图书馆

Cyclooxygenase-2 and Decidual Immune Cells

在线全文

学校读者我要写书评

暂无评论

Reproductive and Developmental Medicine 2019年第3期3卷 177-184页

作者： Si-Yao ha Hui-Li Yang Zhen-Zhen Lai Lu-Yu Ruan Jia-Wei Shi ming-Qing Li Laboratory for Reproductive Immunology Institute of Obstetrics and GynecologyHospital of Obstetrics and GynecologyFudan UniversityShanghai 200080China Laboratory for Reproductive Immunology Shanghai Key Laboratory of Female Reproductive Endocrine Related DiseasesHospital of Obstetrics and GynecologyFudan UniversityShanghai 200011China Laboratory for Reproductive Immunology NHC Key Laboratory of Reproduction Regulation(Shanghai Institute of Planned Parenthood Research)Fudan UniversityShanghai 230032China

Cyclooxygenase-2(COX-2)is a rate-limiting enzyme in arachidonic acid(AA)***-2 and its products(prostanoids)serve versatile biological functions during *** evidences demonstrate special reprogramming of COX-2-catalyzing AA metabolism in decidual immune cells(DICs),particularly in decidual macrophages,corresponding to special gestational *** review summarizes the reprogramming of COX-2-catalyzing AA metabolism in DICs as well as the immunoregulation of diverse COX-2-generating prostanoids in DICs during the different phases of gestation.

关键词： Cyclooxygenase-2 Decidual Immune Cell Metabolism Pregnancy Prostanoid

高效液相色谱-串联质谱法检测花生中的黄曲霉毒素B1

在线全文

学校读者我要写书评

暂无评论

分析试验室 2009年第6期28卷 35-38页

作者：杨静哈益明王锋中国农业科学院农产品加工研究所北京100193 农业部辐照产品监督检验测试中心北京100193

应用高效液相色谱一电喷雾串联四极杆质谱联用系统（***／MS），在多反应离子检测方式（MRM）下，对花生中的黄曲霉毒素B1进行检测。对花生中黄曲霉毒素B1的提取、净化、液相分离及串联质谱等相关检测参数进行了优化研究。用矿（甲醇）... 详细信息

应用高效液相色谱一电喷雾串联四极杆质谱联用系统（***／MS），在多反应离子检测方式（MRM）下，对花生中的黄曲霉毒素B1进行检测。对花生中黄曲霉毒素B1的提取、净化、液相分离及串联质谱等相关检测参数进行了优化研究。用矿（甲醇）：V（水）：6：4提取，OASIS HLB SPE小柱净化，定容过滤。采用V（甲醇）：V（水）（含体积分数0．1％甲酸）=7：3为流动相，前级离子313．0，二级离子241．1、269．1，ESI正离子方式检测，在3．3min出峰。结果表明，在ESI正离子模式下，黄曲霉毒素B1在其线性定量范围0．1—50μg／kg内，相关系数达到0．9999，捡出限为0．03μg／kg，最低定量限为0．1μg／kg。低、中、高浓度添加回收率范围为93％-105％。

关键词：黄曲霉毒素B1 高效液相色谱串联质谱多离子反应检测

Potato-Cabbage Double Cropping Effect on Nitrate Leaching and Resource-Use Efficiencies in an Irrigated Area

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第6期22卷 842-847页

作者： HU Bo FAN ming-Shou haO Yun-Feng ZHang Jian-Hua College of Agronomy Inner Mongolia Agricultural UniversityHohhot 010019(China) Bayannur City Agriculture Science Institute Bayannur 015500(China) School of Life Sciences and State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongHong Kong(China)

To reduce the nitrate leaching risk after potato （Solanum tuberosum L.） harvest and improve nitrogen fertilizer-use efficiency, a potato-cabbage double cropping system （DCS） was established at Hetao, North China, an arid area with irrigated land. A two-year field experiment demonstrated that planting early-maturing potato cultivar under plastic mulch shortened its growth period by 14 d and allowed a second crop of cabbage to scavenge the soil residual NO^--N to a depth of 160 cm, substantially reducing the risk of nitrate leaching into groundwater. The yearly total N uptake in DCS was about 110 kg ha-1 more than that in the conventional cropping system （CCS）, i.e., mono potato planting. This accounted for apparent nitrogen recovery （ANR） improvement of 16.90%-26.57% in the DCS as compared to that in the CCS for both years. As a result, the soil residual NO3-N in the 0-160 cm soil profile in the DCS was lower than that in the CCS. The solar energy-use efficiency and soil-use efficiency were also substantially increased with DCS.

关键词： apparent nitrogen recovery nitrogen uptake soil resources solar energy yield

Long-term organic and inorganic fertilizations enhanced basic soil productivity in a fluvo-aquic soil

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第12期14卷 2477-2489页

作者： Zha Yan WU Xue-ping GONG Fu-fei XU ming-gang ZHang Hui-min CHEN Li-ming HUang Shao-min CAI Dian-xiong National Engineering Laboratory for Improving Quality of Arable Land Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural Sciences School of Environment and Natural Resources The Ohio State UniversityOhio Agricultural Research and Development Center Institute of Plant Nutrition Resources and Environment Henan Academy of Agricultural Sciences

The improvement of soil productivity depends on a rational input of water and nutrients, optimal field management, and the increase of basic soil productivity（BSP）. In this study, BSP is defined as the productive capacity of a farmland soil with its own physical and chemical properties for a specific crop season under local field management. Based on 19-yr data of the long-term agronomic experiments（1989–2008） on a fluvo-aquic soil in Zhengzhou, Henan Province, China, the decision support system for agrotechnology transfer（DSSAT ver. 4.0） crop growth model was used to simulate yields by BSP of winter wheat（Triticum aestivium L.） and summer maize（Zea mays L.） to examine the relationship between BSP and soil organic carbon（SOC） under long-term fertilization. Five treatments were included：（1） no fertilization（control）,（2） nitrogen, phosphorus and potassium fertilizers（NPK）,（3） NPK plus manure（NPKM）,（4） 1.5 times of NPKM（1.5NPKM）, and（5） NPK plus straw（NPKS）. After 19 yr of treatments, the SOC stock increased 16.7, 44.2, 69.9, and 25.2% under the NPK, NPKM, 1.5NPKM, and NPKS, respectively, compared to the initial value. Among various nutrient factors affecting contribution percentage of BSP to winter wheat and summer maize, SOC was a major affecting factor for BSP in the fluvo-aquic soil. There were significant positive correlations between SOC stock and yields by BSP of winter wheat and summer maize（P〈0.01）, and yields by BSP of winter wheat and summer maize increased 154 and 132 kg ha^（–1） when SOC stock increased 1 t C ha^（–1）. Thus, increased SOC accumulation is a crucial way for increasing BSP in fluvo-aquic soil. The manure or straw combined application with chemical fertilizers significantly enhanced BSP compared to the application of chemical fertilizers alone.

关键词： soil organic carbon basic soil productivity long-term fertilization DSSAT model fluvo-aquic soil wheat-maize rotation

Electrophoretic-deposited novel ternary silk fibroin/graphene oxide/hydroxyapatite nanocomposite coatings on titanium substrate for orthopedic applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2016年第3期10卷 270-280页

作者： ming LI Pan XIONG Maosong MO Yan CHENG Yufeng ZHENG Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing 100049 China Center for Biomedical Materials and Tissue Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

The combination of graphene oxide （GO） with robust mechanical property, silk fibroin （SF） with fascinating biological effects and hydroxyapatite （ha） with superior osteogenic activity is a competitive approach to make novel coatings for orthopedic applications. Herein, the feasibility of depositing ternary SF/GO/ha nanocomposite coatings on Ti substrate was firstly verified by exploiting electrophoretic nanotechnology, with SF being used as both a charging additive and a dispersion agent. The surface morphology, microstructure and composition, in vitro hemocompatibility and in vitro cytocompatibility of the resulting coatings were investigated by SEM, Raman, FTIR spectra and biocompatibiUty tests. Results demonstrated that GO, ha and SF could be co-deposited with a uniform, smooth thin-film morphology. The hemolysis rate analysis and the platelet adhesion test indicated good blood compatibility of the coatings. The human osteosarcoma MG63 cells displayed well adhesion and proliferation behaviors on the prepared coatings, with enhanced ALP activities. The present study suggested that SFIGO/ha nanocomposite coatings could be a promising candidate for the surface functionalization of biomaterials, especially as orthopedic implant coating.

关键词： graphene oxide silk fibroin hydroxyapatite nano-biocomposite coatings electrodeposition

在线全文

学校读者我要写书评

暂无评论

三种新的基于相似性的加权模糊推理方法

计算机工程与应用 2006年第28期42卷 34-37页

作者：哈明虎李海军河北大学数学与计算机学院河北保定071002

在模糊专家系统中,模糊推理方法的优劣是衡量系统性能好坏的关键指标。基于相似性的加权模糊推理是针对模糊信息发展的一种既简单又灵活的方法,其关键是模糊集合相似度的定义。在文中,提出了三种新的相似度的定义,讨论了与其相应的模糊... 详细信息

在模糊专家系统中,模糊推理方法的优劣是衡量系统性能好坏的关键指标。基于相似性的加权模糊推理是针对模糊信息发展的一种既简单又灵活的方法,其关键是模糊集合相似度的定义。在文中,提出了三种新的相似度的定义,讨论了与其相应的模糊推理方法;通过实例验证了三种新方法的有效性,并与已有的几种方法进行了比较分析。

关键词：加权模糊产生式规则相似度模糊推理方法专家系统

Phosphomonoesterase Activities,Kinetics and Thermodynamics in a Paddy Soil After Receiving Swine Manure for Six Years

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2015年第2期25卷 294-306页

作者： LI Liang LIang Xin-Qiang LI Hua JI Yuan-Jing LIU Jin YE Yu-Shi TIAN Guang-ming CHEN Ying-Xu LUO Yong-ming Institute of Environmental Science and Technology College of Environmental and Resources SciencesZhejiang University Zhejiang Academy of Agricultural Sciences Key Laboratory for Water Pollution Control and Environmental Safety Yantai Institute of Coastal Zone Research Chinese Academy of Sciences

Soil phosphomonoesterase plays a critical role in controlling phosphorus(P) cycling for crop nutrition,especially in P-deficient soils.A 6-year field experiment was conducted to evaluate soil phosphomonoesterase activities,kinetics and thermodynamics during rice growth stages after consistent swine manure application,to understand the impacts of swine manure amendment rates on soil chemical and enzymatic properties,and to investigate the correlations between soil enzymatic and chemical *** experiment was set out in a randomized complete block design with three replicates and five treatments including three swine manure rates(26,39,and 52 kg P ha^(-1),representing low,middle,and high application rates,respectively) and two controls(no-fertilizer and superphosphate at 26 kg P ha^(-1)).The results indicated that the grain yield and soil chemical properties were significantly improved with the application of P-based swine manure from 0 to 39 kg P ha^(-1);however,the differences between the 39(M_(39)) and 52 kg P ha^(-1) treatments(M_(52)) were not *** enzymatic property analysis indicated that acid phosphomonoesterase was the predominant phosphomonoesterase in the tested *** M_(39) and M_(52) treatments had relatively high initial velocity(V_0),maximal velocity(V_(max)),and activation grade(lgN_a) but low Michaelis constant(K_m),temperature coefficient(Q_(10)),activation energy(E_a),and activation enthalpy(ΔH),implying that the M_(39) and M_(52) treatments could stimulate the enzyme-catalyzed reactions more easily than all other *** correlation analysis showed that the distribution of soil phosphomonoesterase activities mainly followed the distributions of total C and total *** on these results,39 kg P ha^(-1) could be recommended as the most appropriate rate of swine manure amendment.

关键词： activation energy activation enthalpy enzyme-catalyzed reaction maximal velocity Michaelis constant

Structure and intrinsic magnetic properties of Sm_(1-x)Pr_xCo_5(x=0–0.6) compounds

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2016年第8期35卷 627-631页

作者： Miao-Ling Xu ming Yue Yu-Qing Li Qiong Wu Yun Gao College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China Samsung Advanced Institute of Technology Beijing 100028China

In this work, the effects of Pr content on the structure and intrinsic magnetic properties of Sml-xPrxCO5 （x = 0-0.6） compounds prepared by induction melting were systematically investigated by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and magnetic measurements. Microstructural observation and chemical composition analysis show that Sml xPrxCos compounds are composed of （Sin, Pr）Co （1：5） phase and （Sm, Pr）-rich grain boundary phase. XRD results show that all the Sml-xPrxCO5 compounds have a （Sm, Pr）lCo main phase with the hexagonal CaCus-type crystal structure and the （Sm, Pr）2 Co7 impurity phase. In addition, the detailed research shows that the lattice constants （a, c） and unit volume （V） are all enlarged with the increases in Pr con- tent. According to the magnetic measurements, as the Pr content increases to larger than 0.4, both the Curie tem- perature （Tc） and the anisotropy field （ha） of all the Pr- doped compounds decrease rapidly. Meanwhile, the mag- netization of Sml_***5 compounds at applied field of 14 T （MI4 T） are observably improved with Pr doping content of x 〉 0.3. Among them, Smo.6Pro.4Co5 compound exhibits slightly lower ha and Tc, but much higher M14 T than those of the binary SmCos, indicating that doping of proper Pr content into SmCo5 compound can optimize the intrinsic magnetic properties. As a result, the optimal intrinsic magnetic properties of ha = 29.11 T,Tc = 989 K, and M14 T = 102.31 mA.m2.g-1 are obtained in Smo.6Pro.4C05 compound.

关键词： Sml-xPrxCo5 compounds Microstructure Crystal structure Intrinsic magnetic property

在线全文

学校读者我要写书评

暂无评论

基于复拟随机样本的统计学习理论的理论基础

计算机工程与应用 2008年第9期44卷 82-86,93页

作者：张植明田景峰哈明虎河北大学数学与计算机学院河北保定071002 华北电力大学科技学院河北保定071051

引入复拟(概率)随机变量,准范数的定义。给出了复拟随机变量的期望和方差的概念及若干性质;证明了基于复拟随机变量的马尔可夫不等式,契比雪夫不等式和辛钦大数定律;提出了拟概率空间中复经验风险泛函、复期望风险泛函以及复经验风险最... 详细信息

引入复拟(概率)随机变量,准范数的定义。给出了复拟随机变量的期望和方差的概念及若干性质;证明了基于复拟随机变量的马尔可夫不等式,契比雪夫不等式和辛钦大数定律;提出了拟概率空间中复经验风险泛函、复期望风险泛函以及复经验风险最小化原则等定义。证明并讨论了基于复拟随机样本的统计学习理论的关键定理和学习过程一致收敛速度的界,为系统建立基于复拟随机样本的统计学习理论奠定了理论基础。

关键词：复拟随机变量准范数复经验风险最小化原则关键定理收敛速度的界神经网络