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| 1 | Identification and screening of nitrogenefficient cotton genotypes under low and normal nitrogen environments at the seedling stage显示文摘Background: Large quantities of nitrogen(N) fertilizer applied to cotton cropping systems support high yields but cause adverse environmental impacts such as N_20 emission and water eutrophication. The development of cotton cultivars with higher N use efficiencies suitable for low-N conditions is therefore important for sustainable production. In this study, we evaluated 100 cotton genotypes in 2016 for N use efficiency and related traits at the seedling stage.Methods: Sand culture experiment was conducted with low N levels(0.01 g·kg^(-1)) or normal N levels(0.1 g·kg^(-1)).We investigated plant height, SPAD value(soil plant analysis development chlorophyll meter), dry weight, N accumulation, N utilization efficiency, and N uptake efficiency. Through descriptive statistics, principal component analysis and heatmap clustering analysis, we confirmed the evaluation index system of N-efficient genotypes and the classification of N-efficient genotypes.Results: Significant differences were observed among N levels and genotypes for all agronomic traits and N levels.Coefficients of variation varied greatly and ranged from 6.7~28.8 and 7.4~20.8 under low-N and normal-N treatment, respectively. All traits showed highly significant positive correlations with each other, except SPAD value.The principal components under both N levels were similar, showing that total dry weight, aboveground dry weight, total N accumulation, and N uptake efficiency were important components. We confirmed these four traits as suitable screening indexes for low N tolerance. Based on the results of heatmap clustering and scatter diagram analysis of N efficiency value, 10 genotypes were found low-N tolerant, in which five varieties were inefficient under both low and normal N conditions, while four varieties were found efficient under low-N conditions but inefficient under normal-N conditions. Only one variety was efficient under both low and normal-N conditions. Meanwhile, 20 genotypes were identified as low-N sensitive ones, in which 19 genotypes were inefficient under low-N conditions but efficient under normal-N conditions, one variety was inefficient under both low and normal-N conditions.Conclusion: We preliminarily identified Kashi as a low-N tolerant and N-efficient cotton genotype, and CCRI 64 as a lowN sensitive and N-inefficient cotton genotype. Further studies should be carried out to verify the yield and heritability effect of specific genotypes in the field. | ZHANG Hengheng FU Xiaoqiong WANG Xiangru GUI Huiping DONG Qiang PANG Nianchang WANG Zhun ZHANG Xiling SONG Meizhen | 2018 | Journal of Cotton Research2018，1，2： | 9 |
| 2 | Application of modern timber structure in short and medium span bridges in China显示文摘A series of problems about Chinese bridges with short and medium span recent years were analyzed in this paper.The necessity and feasibility of modern timber structure applied in short and medium span bridges in China were also put forward.The results showed that the short and medium span bridges had many problems,such as monotonous structural forms,serious environmental pollution,multiple bridge defects and difficulty in maintenance.With the development of connection and maintenance technology of modern timber structure and its advantages of light self-weight,environmental coordination,high carrying capacity,excellent durability and abundant structural forms,it was necessary and feasible to apply modern timber structure in short and medium span bridges in China.More emphasis on the construction of modern timber structure should be conducted to expand its application scopes and improve the construction proportion of short and medium span timber bridges. | Meizhen Fu Yongjian Liu Na Li Zhiwei Zhang Enzo Siviero | 2014 | Journal of Traffic and Transportation Engineering(English Edition)2014，1，1： | 3 |
| 3 | Gold nanoparticles-embedded ceria with enhanced antioxidant activities for treating inflammatory bowel disease显示文摘The excessive reactive oxygen species(ROS)is a hallmark associated with the initiation and progression of inflammatory bowel disease(IBD),which execrably form a vicious cycle of ROS and inflammation to continually promote disease progression.Here,the gold nanoparticles-embedded ceria nanoparticles(Au/CeO_(2))with enhanced antioxidant activities are designed to block this cycle reaction for treating IBD by scavenging overproduced ROS.The Au/CeO_(2) with core-shell and porous structure exhibits significantly higher enzymatic catalytic activities compared with commercial ceria nanoparticles,likely due to the effective exposure of catalytic sites,higher content of Ce(III)and oxygen vacancy,and accelerated reduction from Ce(IV)to Ce(III).Being coated with negatively-charged hyaluronic acid,the Au/CeO_(2)@HA facilitates accumulation in inflamed colon tissues via oral administration,reduces pro-inflammatory cytokines,and effectively alleviates colon injury in colitis mice.Overall,the Au/CeO_(2)@HA with good biocompatibility is a promising nano-therapeutic for treating IBD. | Mingyi Li Jia Liu Lin Shi Cheng Zhou Meizhen Zou Daan Fu Ye Yuan Chundong Yao Lifang Zhang Sumei Qin Miaodeng Liu Qian Cheng Zheng Wang Lin Wang | 2023 | Bioactive Materials2023，，7： | 0 |
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