36 results on '"Li, Jing-Zhong"'
Search Results
2. One-step generation of composite soybean plants with transgenic roots by Agrobacterium rhizogenes-mediated transformation
- Author
-
Ying-lun Fan, Xing-hui Zhang, Li-jing Zhong, Xiu-yuan Wang, Liang-shen Jin, and Shan-hua Lyu
- Subjects
Hairy root transformation ,Agrobacterium rhizogenes ,Soybean (Glycine max (L.) Merr.) ,Composite plants ,Rfg1 ,Strain K599 ,Botany ,QK1-989 - Abstract
Abstract Background Agrobacterium rhizogenes-mediated (ARM) transformation is a highly efficient technique for generating composite plants composed of transgenic roots and wild-type shoot, providing a powerful tool for studying root biology. The ARM transformation has been established in many plant species, including soybean. However, traditional transformation of soybean, transformation efficiency is low. Additionally, the hairy roots were induced in a medium, and then the generated composite plants were transplanted into another medium for growth. This two-step operation is not only time-consuming, but aggravates contamination risk in the study of plant-microbe interactions. Results Here, we report a one-step ARM transformation method with higher transformation efficiency for generating composite soybean plants. Both the induction of hairy roots and continuous growth of the composite plants were conducted in a single growth medium. The primary root of a 7-day-old seedling was decapitated with a slanted cut, the residual hypocotyl (maintained 0.7-1 cm apical portion) was inoculated with A. rhizogenes harboring the gene construct of interest. Subsequently, the infected seedling was planted into a pot with wet sterile vermiculite. Almost 100% of the infected seedlings could produce transgenic positive roots 16 days post-inoculation in 7 tested genotypes. Importantly, the transgenic hairy roots in each composite plant are about three times more than those of the traditional ARM transformation, indicating that the one-step method is simpler in operation and higher efficiency in transformation. The reliability of the one-step method was verified by CRISPR/Cas9 system to knockout the soybean Rfg1, which restricts nodulation in Williams 82 (Nod-) by Sinorhizobium fredii USDA193. Furthermore, we applied this method to analyze the function of Arabidopsis YAO promoter in soybean. The activity of YAO promoter was detected in whole roots and stronger in the root tips. We also extended the protocol to tomato. Conclusions We established a one-step ARM transformation method, which is more convenient in operation and higher efficiency (almost 100%) in transformation for generating composite soybean plants. This method has been validated in promoter functional analysis and rhizobia-legume interactions. We anticipate a broad application of this method to analyze root-related events in tomato and other plant species besides soybean.
- Published
- 2020
- Full Text
- View/download PDF
3. A remote management system for control and surveillance of echinococcosis: design and implementation based on internet of things
- Author
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Yang, Shi-Jie, Xiao, Ning, Li, Jing-Zhong, Feng, Yu, Ma, Jun-Ying, Quzhen, Gong-Sang, Yu, Qing, Zhang, Ting, Yi, Shi-Cheng, and Zhou, Xiao-Nong
- Published
- 2021
- Full Text
- View/download PDF
4. Global survey of miRNAs and tRNA-derived small RNAs from the human parasitic protist Trichomonas vaginalis
- Author
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Wang, Zhen-Sheng, Zhou, Hong-Chang, Wei, Chun-Yan, Wang, Zhi-Hua, Hao, Xiao, Zhang, Lian-Hui, Li, Jing-Zhong, Wang, Zeng-Lei, and Wang, Heng
- Published
- 2021
- Full Text
- View/download PDF
5. High expression of HLA-DQA1 predicts poor outcome in patients with esophageal squamous cell carcinoma in Northern China
- Author
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Shen, Fang-Fang, Pan, Ying, Li, Jing-Zhong, Zhao, Fang, Yang, Hai-Jun, Li, Jun-Kuo, Gao, Zhao-Wei, Su, Jing-Fen, Duan, Li-Juan, Lun, Shu-Min, Zhang, Peng, Tian, Lin-Qiang, Sun, Gang, Huang, Da, Cao, Yan-Tian, and Zhou, Fu-You
- Published
- 2019
- Full Text
- View/download PDF
6. Does Awareness of Diabetic Status Increase Risk of Depressive or Anxious Symptoms? Findings from the China Multi-Ethnic Cohort (CMEC) Study
- Author
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Liu, Yuanyuan, primary, Chen, Liling, additional, Zhou, Hanwen, additional, Guan, Han, additional, Feng, Yuemei, additional, yangji, Baima, additional, Liu, Qiaolan, additional, Liu, Xiang, additional, Xia, Jinjie, additional, Li, Jing-Zhong, additional, and Zhao, Xing, additional
- Published
- 2022
- Full Text
- View/download PDF
7. Mechanism of Wuweijiangyasan in the treatment of spontaneous hypertension based on network pharmacology
- Author
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Zhou, Jian-Guo, primary, Zhao, Hui-Hui, primary, Chen, Ai-Ping, additional, Zhang, Zi-Juan, additional, Li, Jing-Zhong, additional, Zuo, Ling, additional, Cheng, Ya-Xing, additional, Deng, Dong, additional, Li, Xue-Li, additional, Ma, Xiao-Yun, additional, Man, Da, additional, Zheng, Ming-Huang, additional, Chen, Jian, additional, Wen, Bo, additional, and Wang, Juan, additional
- Published
- 2022
- Full Text
- View/download PDF
8. Symbolic Computation And Education
- Author
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Dongming Wang, Shangzhi Li, Jing-zhong Zhang and Dongming Wang, Shangzhi Li, Jing-zhong Zhang
- Published
- 2007
9. Smart deworming collar: A novel tool for reducing Echinococcus infection in dogs
- Author
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Yang, Shi-Jie, primary, Xiao, Ning, additional, Li, Jing-Zhong, additional, Feng, Yu, additional, Ma, Jun-Ying, additional, Quzhen, Gong-Sang, additional, Yu, Qing, additional, Zhang, Ting, additional, Yi, Shi-Cheng, additional, Luo, Zhao-Hui, additional, Pang, Hua-Sheng, additional, Li, Chuang, additional, Shen, Zhuo-Li, additional, Hou, Ke-Sheng, additional, Zhang, Bin-Bin, additional, Zhou, Yi-Biao, additional, Jiang, Hong-Lin, additional, and Zhou, Xiao-Nong, additional
- Published
- 2021
- Full Text
- View/download PDF
10. Additional file 1 of Global survey of miRNAs and tRNA-derived small RNAs from the human parasitic protist Trichomonas vaginalis
- Author
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Wang, Zhen-Sheng, Zhou, Hong-Chang, Wei, Chun-Yan, Wang, Zhi-Hua, Hao, Xiao, Zhang, Lian-Hui, Li, Jing-Zhong, Wang, Zeng-Lei, and Wang, Heng
- Abstract
Additional file 1: Table S1. Sequences of stem-loop reverse transcription primers. Table S2. Sequences of PCR primers. Table S3. Counts of reads mapped to known miRNA sequences.
- Published
- 2021
- Full Text
- View/download PDF
11. One-step generation of composite soybean plants with transgenic roots by Agrobacterium rhizogenes-mediated transformation
- Author
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Xiu-yuan Wang, Liang-shen Jin, Shan-hua Lyu, Xing-hui Zhang, Ying-lun Fan, and Li-jing Zhong
- Subjects
Agrobacterium ,Plant Science ,Sinorhizobium fredii ,Plant Roots ,Hypocotyl ,chemistry.chemical_compound ,Transformation, Genetic ,Strain K599 ,lcsh:Botany ,Sinorhizobium fredii USDA193 ,Tomato (Solanum lycopersicum) ,Growth medium ,Composite plants ,biology ,Methodology Article ,fungi ,food and beverages ,Plants, Genetically Modified ,biology.organism_classification ,Agrobacterium rhizogenes ,lcsh:QK1-989 ,Horticulture ,Transformation (genetics) ,YAO promoter ,chemistry ,Seedling ,Shoot ,Hairy root transformation ,Soybeans ,Soybean (Glycine max (L.) Merr.) ,Rhizobium ,Rfg1 ,Transformation efficiency - Abstract
Background Agrobacterium rhizogenes-mediated (ARM) transformation is a highly efficient technique for generating composite plants composed of transgenic roots and wild-type shoot, providing a powerful tool for studying root biology. The ARM transformation has been established in many plant species, including soybean. However, traditional transformation of soybean, transformation efficiency is low. Additionally, the hairy roots were induced in a medium, and then the generated composite plants were transplanted into another medium for growth. This two-step operation is not only time-consuming, but aggravates contamination risk in the study of plant-microbe interactions. Results Here, we report a one-step ARM transformation method with higher transformation efficiency for generating composite soybean plants. Both the induction of hairy roots and continuous growth of the composite plants were conducted in a single growth medium. The primary root of a 7-day-old seedling was decapitated with a slanted cut, the residual hypocotyl (maintained 0.7-1 cm apical portion) was inoculated with A. rhizogenes harboring the gene construct of interest. Subsequently, the infected seedling was planted into a pot with wet sterile vermiculite. Almost 100% of the infected seedlings could produce transgenic positive roots 16 days post-inoculation in 7 tested genotypes. Importantly, the transgenic hairy roots in each composite plant are about three times more than those of the traditional ARM transformation, indicating that the one-step method is simpler in operation and higher efficiency in transformation. The reliability of the one-step method was verified by CRISPR/Cas9 system to knockout the soybean Rfg1, which restricts nodulation in Williams 82 (Nod-) by Sinorhizobium fredii USDA193. Furthermore, we applied this method to analyze the function of Arabidopsis YAO promoter in soybean. The activity of YAO promoter was detected in whole roots and stronger in the root tips. We also extended the protocol to tomato. Conclusions We established a one-step ARM transformation method, which is more convenient in operation and higher efficiency (almost 100%) in transformation for generating composite soybean plants. This method has been validated in promoter functional analysis and rhizobia-legume interactions. We anticipate a broad application of this method to analyze root-related events in tomato and other plant species besides soybean.
- Published
- 2020
12. Receptor-mediated gene delivery using polyethylenimine (PEI) coupled with polypeptides targeting FGF receptors on cells surface
- Author
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Li Da, Wang Qing-qing, Tang Gu-ping, Huang Hong-liang, Shen Fen-ping, Li Jing-zhong, and Yu Hai
- Published
- 2006
- Full Text
- View/download PDF
13. A Remote Management System for Control and Surveillance of Echinococcosis: Design and Implementation Based on Internet of Things
- Author
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Yang, Shi-Jie, primary, Xiao, Ning, additional, Li, Jing-Zhong, additional, Feng, Yu, additional, Ma, Jun-Ying, additional, Quzhen, Gong-Sang, additional, Yu, Qing, additional, Zhang, Ting, additional, Yi, Shi-Cheng, additional, and Zhou, Xiao-Nong, additional
- Published
- 2020
- Full Text
- View/download PDF
14. Genetic diversity of two Tibetan macaque (Macaca thibetana) populations from Guizhou and Yunnan in China based on mitochondrial DNA D-loop sequences
- Author
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Chong-Qing Li, Li-Jing Zhong, Jun Mu, Yongfang Yao, Qingyong Ni, Mingwang Zhang, and Huailiang Xu
- Subjects
Genetics ,education.field_of_study ,Genetic diversity ,Phylogenetic tree ,biology ,Population ,biology.organism_classification ,Biochemistry ,Genetic analysis ,Macaque ,Gene flow ,Nucleotide diversity ,Evolutionary biology ,biology.animal ,Tibetan macaque ,education ,Molecular Biology - Abstract
Tibetan macaque (Macaca thibetana), an endangered species endemic to China, is categorized as a Category II species under the Chinese Wild Animal Protection Law and listed in Appendix II of the Convention on International Trade in Endangered Species. To further assess genetic diversity and population structure within this species, we sequenced 477 bp of mitochondrial DNA control region in 30 Tibetan macaques from the Guizhou (GZ) and Yunnan (YN) of China and conducted population genetic analysis, along with 15 previously described haplotype sequences representing 55 individuals from Sichuan (SC) and Anhui (AH). 87 polymorphic sites were detected in the alignment of 45 sequences and defined 22 haplotypes, of which 9 were newly identified. Haplotype diversity (h), nucleotide diversity (π) and average number of nucleotide differences (K) is 0.911 ± 0.015, 0.06090 ± 0.00126 and 28.32, respectively, indicating higher genetic diversity in the whole Tibetan macaque population. Analysis of molecular variance (AMOVA) partitioned the total variation into 83.63 % among populations and 16.37 % within populations, revealing that variations occured among populations mainly. Further analysis demonstrated that significant genetic differentiation (Fst = 0.83628, P < 0.01) and poor gene flow (Nm < 1) had occurred among these four populations. On the phylogenetic tree and haplotype network plot, 22 haplotypes cluster together according to their geographical origins, exhibiting an obvious phylogeographic pattern. We speculate that the significant genetic differentiation among these macaque populations might result from long-term geographic barrier and human activity. In particular, Yangtze River probably play a vital role in population differentiation of Tibetan macaques.
- Published
- 2013
15. Calibration of Multiplexed Fiber-Optic Spectroscopy
- Author
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Megan Holden, Linda M. Harvey, Jim Faulkner, Mariana L. Fazenda, Alison Nordon, Brian McNeil, Julian Morris, David Littlejohn, Zeng-Ping Chen, and Li-Jing Zhong
- Subjects
Optical fiber ,Chemistry ,Calibration (statistics) ,Spectrum Analysis ,Near-infrared spectroscopy ,Linear model ,Analytical chemistry ,Antibodies, Monoclonal ,CHO Cells ,Multiplexing ,Spectral line ,Analytical Chemistry ,law.invention ,Cricetulus ,law ,Cricetinae ,Calibration ,Solvents ,Animals ,Preprocessor ,Biological system ,Optical Fibers ,Fabry–Pérot interferometer - Abstract
Large-scale commercial bioprocesses that manufacture biopharmaceutical products such as monoclonal antibodies generally involve multiple bioreactors operated in parallel. Spectra recorded during in situ monitoring of multiple bioreactors by multiplexed fiber-optic spectroscopies contain not only spectral information of the chemical constituents but also contributions resulting from differences in the optical properties of the probes. Spectra with variations induced by probe differences cannot be efficiently modeled by the commonly used multivariate linear calibration models or effectively removed by popular empirical preprocessing methods. In this study, for the first time, a calibration model is proposed for the analysis of complex spectral data sets arising from multiplexed probes. In the proposed calibration model, the spectral variations introduced by probe differences are explicitly modeled by introducing a multiplicative parameter for each optical probe, and then their detrimental effects are effectively mitigated through a "dual calibration" strategy. The performance of the proposed multiplex calibration model has been tested on two multiplexed spectral data sets (i.e., MIR data of ternary mixtures and NIR data of bioprocesses). Experimental results suggest that the proposed calibration model can effectively mitigate the detrimental effects of probe differences and hence provide much more accurate predictions than commonly used multivariate linear calibration models (such as PLS) with and without empirical data preprocessing methods such as orthogonal signal correction, standard normal variate, or multiplicative signal correction.
- Published
- 2011
16. The Study on Construction Scheme of Computer Laboratory Room Based on DAWNSTOR Desktop Virtualization System
- Author
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Guo, Feng-Ying, primary, Zhai, Xing, primary, Huang, You-Liang, primary, Li, Jing-Zhong, primary, and Ma, Xing-Guang, primary
- Published
- 2016
- Full Text
- View/download PDF
17. Genetic variation between two Tibetan macaque (Macaca thibetana) populations in the eastern China based on mitochondrial DNA control region sequences
- Author
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Jia-Yi Li, Qingyong Ni, Bofeng Liu, Yongfang Yao, Li-Jing Zhong, and Huailiang Xu
- Subjects
mtDNA control region ,Genetics ,education.field_of_study ,Genetic diversity ,Mitochondrial DNA ,China ,Phylogenetic tree ,biology ,Base Sequence ,Population ,Genetic Variation ,Genetic relationship ,biology.organism_classification ,DNA, Mitochondrial ,Polymerase Chain Reaction ,Haplotypes ,Sequence Homology, Nucleic Acid ,Genetic variation ,Animals ,Macaca ,Tibetan macaque ,education ,Molecular Biology ,DNA Primers - Abstract
Tibetan macaque (Macaca thibetana) is a threatened primate species endemic to China. Population genetic and phylogenetic analyses were conducted in 66 Tibetan individuals from Sichuan (SC), Huangshan (HS), and Fujian (FJ) based on a 477-bp fragment of mitochondrial DNA control region. Four new haplotypes were defined, and a relatively high level of genetic diversity was first observed in FJ populations (Hd = 0.7661). Notably, a continuous approximately 10 bp-fragment deletion was observed near the 5' end of the mtDNA control region of both HS and FJ populations when compared with that of SC population, and a sharing haplotype was found between the two populations, revealing a closer genetic relationship. However, significant genetic differentiation (FST = 0.8700) and more poor gene exchange (Nm1) had occurred among three populations. This study mainly provide a further insight into the genetic relationship between HS and FJ Tibetan macaque populations, but it may be necessary to carry out further study with extra samples from other locations in the geographic coverage of the two subspecies (M. thibetana pullus and M. thibetana huangshanensis).
- Published
- 2012
18. Maintaining the predictive abilities of multivariate calibration models by spectral space transformation
- Author
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Zeng-Ping Chen, Shu-Xia Wang, Ru-Qin Yu, Megan Holden, Wen Du, David Littlejohn, Alison Nordon, and Li-Jing Zhong
- Subjects
Principal Component Analysis ,Multivariate analysis ,Models, Statistical ,Spectroscopy, Near-Infrared ,Spectrometer ,Calibration (statistics) ,Chemistry ,business.industry ,Process analytical technology ,Astrophysics::Instrumentation and Methods for Astrophysics ,Univariate ,Spectral space ,Pattern recognition ,Biochemistry ,Analytical Chemistry ,Transformation (function) ,Statistics ,Calibration ,Multivariate Analysis ,Piecewise ,Environmental Chemistry ,Artificial intelligence ,business ,Spectroscopy ,Tablets - Abstract
In quantitative on-line/in-line monitoring of chemical and bio-chemical processes using spectroscopic instruments, multivariate calibration models are indispensable for the extraction of chemical information from complex spectroscopic measurements. The development of reliable multivariate calibration models is generally time-consuming and costly. Therefore, once a reliable multivariate calibration model is established, it is expected to be used for an extended period. However, any change in the instrumental response or variations in the measurement conditions can render a multivariate calibration model invalid. In this contribution, a new method, spectral space transformation (SST), has been developed to maintain the predictive abilities of multivariate calibration models when the spectrometer or measurement conditions are altered. SST tries to eliminate the spectral differences induced by the changes in instruments or measurement conditions through the transformation between two spectral spaces spanned by the corresponding spectra of a subset of standardization samples measured on two instruments or under two sets of experimental conditions. The performance of the method has been tested on two data sets comprising NIR and MIR spectra. The experimental results show that SST can achieve satisfactory analyte predictions from spectroscopic measurements subject to spectrometer/probe alteration, when only a few standardization samples are used. Compared with the existing popular methods designed for the same purpose, i.e. global PLS, univariate slope and bias correction (SBC) and piecewise direct standardization (PDS), SST has the advantages of implementation simplicity, wider applicability and better performance in terms of predictive accuracy.
- Published
- 2010
19. The Application of Agricultural Remote Sensing in Remote Sensing Teaching Practice
- Author
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Li, Jing Zhong, primary, Yan, Hui, additional, and Yang, Meng Meng, additional
- Published
- 2014
- Full Text
- View/download PDF
20. Computer simulation of particle packing and percolation
- Author
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Li, Jing Zhong
- Subjects
Compacting ,Powder metallurgy - Published
- 1998
- Full Text
- View/download PDF
21. The calculation of uncertainty data based on blind number
- Author
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Ni, Xiang-Long, primary, Kang, Jian-She, additional, Li, Jing-Zhong, additional, and Ren, Xu, additional
- Published
- 2013
- Full Text
- View/download PDF
22. A Parallel Computing Dynamic Task Scheduling System for Nano-Materials Design and Simulation
- Author
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Zeng, Xiao Hui, primary, Li, Jing Zhong, additional, Bo, Deng Li, additional, Zhang, Chen, additional, and Luo, Wen Lang, additional
- Published
- 2013
- Full Text
- View/download PDF
23. Study on the Relationship between Urban Surface Temperature and Vegetation Index in Xuchang City
- Author
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Li, Jing Zhong, primary and Zheng, Jing Gang, additional
- Published
- 2013
- Full Text
- View/download PDF
24. Sustainable Development Study in Xuchang City Based on Relative Carrying Capacity of Resources
- Author
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Yan, Hui, primary and Li, Jing Zhong, additional
- Published
- 2012
- Full Text
- View/download PDF
25. Extraction of spectral difference characteristics of Stellera chamaejasme in Qilian County of Qinghai Province, Northwest China.
- Author
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CHENG Di, LIU Yong-mei, LI Jing-zhong, and MO Chong-hui
- Abstract
Stellera chamaejasme is one of the main poisonous weeds distributed in alpine meadow of Qinghai Province. Rapid spreading of S. chamaejasme has done serious harm to local animal husbandry and caused continuous grassland ecosystem degradation. This paper focused on the spectral differences between S. chamaejasme and herbage, taking the typical degraded alpine meadow dominated by S. chamaejasme in Qilian County of Haibei Region as the test site and using the spectral measurements acquired in the full?blossom period of S. chamaejasme from 2012 to 2014. The results showed that the spectral behavior of flowers of S. chamaejasme differed significantly from green background that included leaves of S. chamaejasme and herbage within 350–900 nm of VIS-NIR wavebands. The biggest reflectance difference between flowers of S. chamaejasme and green background was located in the red valley, followed by the blue valley. The reflectance of S. chamaejasme community increased with the rising of coverage, the biggest reflectance difference between S. chamaejasme and herbage communities lied in the near-infrared peak, and the best separability between S. chamaejasme communities with different coverage was also at the point. The difference of first derivative spectra between flowers of S. chamaejasme and green background located in amplitude of yellow edge was remarkable, followed by amplitude of blue edge, the same as differences between S. chamaejasme and herbage communities. Linear regression analysis between coverage of S. chamaejasme and spectral feature parameters showed best result for red valley (R
2 =0.94). Finally, the red valley, the blue valley and the near-infrared peak were proposed for discriminating S. chamaejasme from herbage in the full-blossom period of S. chamaejasme, and the combination of corresponding red, blue and near-infrared bands could be used to build sensitive indices for S. chamaejasme recognition. [ABSTRACT FROM AUTHOR]- Published
- 2015
26. Computer simulation of particle packing and percolation
- Author
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Li, Jing Zhong, Materials Science and Engineering, Faculty of Science & Technology, UNSW and Li, Jing Zhong, Materials Science and Engineering, Faculty of Science & Technology, UNSW
- Published
- 1998
27. Calibration of Multiplexed Fiber-Optic Spectroscopy.
- Author
-
Zeng-Ping Chen, Li-Jing Zhong, Nordon, Alison, Littlejohn, David, Holden, Megan, Fazenda, Mariana, Harvey, Linda, McNeil, Brian, Faulkner, Jim, and Morris, Julian
- Subjects
- *
CALIBRATION , *MULTIPLEXING , *FIBER optics , *SPECTRUM analysis , *MONOCLONAL antibodies , *BIOCHEMICAL engineering , *BIOREACTORS - Abstract
Large-scale commercial bioprocesses that manufacture biopharmaceutical products such as monoclonal antibodies generally involve multiple bioreactors operated in parallel. Spectra recorded during in situ monitoring of multiple bioreactors by multiplexed fiber-optic spectroscopies contain not only spectral information of the chemical constituents but also contributions resulting from differences in the optical properties of the probes. Spectra with variations induced by probe differences cannot be efficiently modeled by the commonly used multivariate linear calibration models or effectively removed by popular empirical preprocessing methods. In this study, for the first time, a calibration model is proposed for the analysis of complex spectral data sets arising from multiplexed probes. In the proposed calibration model, the spectral variations introduced by probe differences are explicitly modeled by introducing a multiplicative parameter for each optical probe, and then their detrimental effects are effectively mitigated through a "dual calibration" strategy. The performance of the proposed multiplex calibration model has been tested on two multiplexed spectral data sets (i.e., MIR data of ternary mixtures and NIR data of bioprocesses). Experimental results suggest that the proposed calibration model can effectively mitigate the detrimental effects of probe differences and hence provide much more accurate predictions than commonly used multivariate linear calibration models (such as PLS) with and without empirical data preprocessing methods such as orthogonal signal correction, standard normal variate, or multiplicative signal correction. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
28. NEUTRON DIFFRACTION STUDY OF TETRAGONAL BARIUM TITANATE
- Author
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Li Jing-Zhong, Jiang Yi-Jian, and Zeng Ling-Zhi
- Subjects
chemistry.chemical_compound ,Crystallography ,Tetragonal crystal system ,Materials science ,chemistry ,Group (periodic table) ,Barium titanate ,Neutron diffraction ,General Physics and Astronomy ,Neutron ,Crystal structure ,Space (mathematics) - Abstract
The crystal structure of tetragonal barium titanate (space group P 4 mm) was determined at 13.6℃, using the data collected by neutron four-circle diffractoraeter, R(F) = 0.0186. The O atoms near b sites distribute disorberly.
- Published
- 1988
29. [Spatio-temporal variations of vegetation cover in semi-arid regions and its response to climate change: A case study of Xilin Gol, Inner Mongolia, China].
- Author
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Li JZ, Xin ZH, Xie X, Xue B, and Ren WX
- Subjects
- China, Sustainable Development, Temperature, Ecosystem, Climate Change, Conservation of Natural Resources
- Abstract
The quantitative analysis of spatio-temporal variations of vegetation cover and its correlation with climate are of great significance for understanding of ecological environment, ecological civilization construction, and sustainable development in semi-arid areas. We investigated the spatio-temporal variations of normalized difference vegetation index (NDVI) and its response to climate change during 2000-2020 in Xilin Gol, Inner Mongolia, by using trend analysis, regression analysis and partial correlation analysis based on the data of MODIS-NDVI, tempe-rature, precipitation, digital elevation model. The results showed that vegetation cover in Xilin Gol had been increased from 2000 to 2020, which generally included three phases, i.e. , stable fluctuation, rapid growth, and steady growth. The mean NDVI showed a zonal increasing distribution from southwest to northeast, and had a strong correlation with elevation and population density in Xilin Gol region. The high values of NDVI were mainly in the east, with a significant increasing trend, and the low values were in the southwest, with a local degradation. The sensitivity of vegetation cover to climate change showed spatial and temporal variations. The spatial variation of vegetation was more sensitive to temperature and the interannual variation was sensitive to annual precipitation. In summary, vegetation cover improved overall in Xilin Gol, but there was degradation in some areas. We should formulate differentiated and precise vegetation restoration and ecological environmental protection policies.
- Published
- 2024
- Full Text
- View/download PDF
30. Virtual ecological technology: Concepts, systems, and application perspectives.
- Author
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Xie X, Wu TC, Cao BL, Li JZ, and Xue B
- Subjects
- Humans, Environment, Geography, Sustainable Development, Ecosystem, Air Pollution
- Abstract
Virtual ecological technology is a new technology that builds the foundation of a digital ecological system, simulates the process of ecological evolution, and establishes a global knowledge analysis system based on a unified spatio-temporal benchmark. It is a new direction for the interdisciplinary integration and development of eco-logy, geographic information science, computer science and other subjects towards modernization, informatization, and intelligence. Research, development, and application of virtual ecological technology is of great significance for the development of ecology as a discipline, ecosystem management, and regional sustainable development. Curren-tly, research on virtual ecological technology is still in its infancy and lacks a complete and clearly defined framework, making it difficult to support systematic iterative development and scientific analysis. In this paper, starting from the main theories and objectives of modern ecology, we summarized the main contents and technical requirements of virtual ecological construction, and proposed a key technical system of virtual ecology that integrated vir-tual geography and digital twin technology. From the perspective of application scenarios, we analyzed the application capabilities of virtual ecological technology in air pollution and energy analysis. Finally, we summarized the deve-lopment potential of virtual ecological technology in the digital construction of the ecological environment, intelligent computing, and realistic expression of different levels of ecological space resources transformation under the background of new generation of information technology, both at the local computing point breakthrough and the global technology point fusion aspects. This would enrich and advance the technical capabilities that support China's ecological space resource transformation.
- Published
- 2023
- Full Text
- View/download PDF
31. [Spatial heterogeneity of soil fungal diversity in area with presence of Stellera chamaejasme on the degraded alpine meadow].
- Author
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Liu YM, Zhao F, He W, Wang L, Li JZ, and Liu JH
- Subjects
- Ecosystem, Fungi, Grassland, Soil Microbiology, Soil, Thymelaeaceae
- Abstract
Stellera chamaejasme is one of the most serious weeds in Qinhai-Tibetan Plateau, the rapid expansion of which exerts an increasing effect on the alpine meadow ecosystem. With high-throughput sequencing technology, geostatistics and GIS method, the spatial heterogeneity of soil fungal diversity in Stellera occurrence area and the spatial correlation between Stellera coverage and soil fungal diversity were investigated in a typical degraded alpine meadow of the Qilian Mountain. Compared to no-Stellera area, the fungi richness in Stellera area decreased, the dominance increased, and the α-diversity reduced. The difference of fungal species composition enhanced and β-diversity significantly increased. The spatial pattern of soil fungal diversity was affected by the invasion of Stellera, resulting in higher fragmentation in occurrence area. Spatial heterogeneity of species composition increased remarkably, and spatial stability of α-diversity and β-diversity decreased. The portion of positive correlation and negative correlation interlaced, indicating no clear spatial correlation between Stellera coverage and soil fungal diversity. Our results indicate that the spatial pattern of soil fungal diversity was affected by the interaction of soil and vegetation in Stellera invaded meadows.
- Published
- 2020
- Full Text
- View/download PDF
32. [Spatial-temporal process and characteristics of vegetation recovery after Wenchuan earthquake: A case study in Longxi River basin of Dujiangyan, China.]
- Author
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Li JZ, Cao MM, Qiu HJ, Xue B, Hu S, and Cui P
- Subjects
- China, Disasters, Environmental Monitoring, Rivers, Spatio-Temporal Analysis, Earthquakes, Ecosystem, Plant Development, Plants
- Abstract
Quantitative evaluation on the vegetation recovery after the earthquake is of great scienti-fic significance for local ecological system rebuilding and regional social-economic sustainable deve-lopment. By taking the Longxi River Basin in Dujiangyan of Sichuan Province as an example, and employing the MODIS-NDVI time-series data, this paper illustrated the dynamic changes of the ve-getation cover rates in Longxi River basin before and after the 5.12 Wenchuan Earthquake by using Landsat data, and then time-space characters of the recovery rates of the damaged vegetation was quantified structurally by referring the factors of river-system and terrain. The results showed that the recovery of impaired vegetation coverage worked well from a holistic point of view, but the response of vegetation coverage to earthquake disaster showed a lagging-phenomenon. The recovery rate of damaged vegetation was significantly correlated to its distance to surrounding river systems, elevation, slope degree, and slope aspect. This finding could provide technical supports for decision-makers to intervene the recovering process after earthquake.
- Published
- 2016
- Full Text
- View/download PDF
33. [Remote Sensing Estimation of Plant Litter Cover Based on the Spectra of Plant Litter-Soil Mixed Scenes].
- Author
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Xie XY, Liu YM, Li JZ, Chang W, and Wang L
- Subjects
- Forests, Plant Leaves, Remote Sensing Technology, Soil
- Abstract
Quantifying plant litter cover is important to evaluate the effectiveness of vegetation to protect soil against soil erosion. Field campaign was carried out in the Loess Hilly-gully Region of Northern Shaanxi to acquire the spectral reflectance data of plant-soil mixed scenes for two broadleaf forests and rehabilitated grassland. Spectral behavior of plant-soil mixed scenes was analyzed and the effectiveness of hyperspectral indexes NDLI (normalized difference lignin index) and CAI (cellulose absorption index) for quantifying plant litter cover was evaluated based on lab and field experiments. The results showed spectra reflectance of plant-soil mixed scenes with different proportions of litter and soil varied greatly by the influence of color and water content. The NDLI and CAI values increased with the rise of proportion of litter within the mixed scene under dry and wet status, regression analysis between the two indexes and plant litter cover of mixed scenes showed that the obviously better result for CAI (R2=0.98, rehabilitated grassland and broadleaf forests under dry status). The discrimination between mixed scenes and soil using CAI significantly outperformed NDLI under dry status; the estimation of plant litter cover by CAI is more effective compared to NDLI. Lab analysis was validated by field measuring: R2=0.90 showed highest correlation between CAI and plant litter cover for rehabilitated grassland. The validity of estimation of plant litter cover by both two indexes reduced to some degree in the field. The research enhanced the scientific basis for remote sensing estimation of plant litter cover.
- Published
- 2016
34. [Extraction of spectral difference characteristics of Stellera chamaejasme in Qilian County of Qinghai Province, Northwest China].
- Author
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Cheng D, Liu YM, Li JZ, and Mo CH
- Subjects
- Animals, China, Flowers, Grassland, Plant Leaves, Spectrum Analysis, Plant Weeds growth & development, Thymelaeaceae growth & development
- Abstract
Stellera chamaejasme is one of the main poisonous weeds distributed in alpine meadow of Qinghai Province. Rapid spreading of S. chamaejasme has done serious harm to local animal husbandry and caused continuous grassland ecosystem degradation. This paper focused on the spectral differences between S. chamaejasme and herbage, taking the typical degraded alpine meadow dominated by S. chamaejasme in Qilian County of Haibei Region as the test site and using the spectral measurements acquired in the full-blossom period of S. chamaejasme from 2012 to 2014. The results showed that the spectral behavior of flowers of S. chamaejasme differed significantly from green background that included leaves of S. chamaejasme and herbage within 350-900 nm of VIS-NIR wavebands. The biggest reflectance difference between flowers of S. chamaejasme and green background was located in the red valley, followed by the blue valley. The reflectance of S. chamaejasme community increased with the rising of coverage, the biggest reflectance difference between S. chamaejasme and herbage communities lied in the near-infrared peak, and the best separability between S. chamaejasme communities with different coverage was also at the point. The difference of first derivative spectra between flowers of S. chamaejasme and green background located in amplitude of yellow edge was remarkable, followed by amplitude of blue edge, the same as differences between S. chamaejasme and herbage communities. Linear regression analysis between coverage of S. chamaejasme and spectral feature parameters showed best result for red valley (R2 = 0.94). Finally, the red valley, the blue valley and the near-infrared peak were proposed for discriminating S. chamaejasme from herbage in the full-blossom period of S. chamaejasme, and the combination of corresponding red, blue and near-infrared bands could be used to build sensitive indices for S. chamaejasme recognition.
- Published
- 2015
35. [Preparation of mB7.1-GPI and SEA-TM dual-anchored tumor cell vaccine and its antitumor effect].
- Author
-
Yi PY, Yu H, Ma WX, Wang QQ, Huang CX, and Li JZ
- Subjects
- Animals, B7-1 Antigen, Cytotoxicity, Immunologic, Female, Genetic Engineering, Lymphocyte Activation, Lymphoma immunology, Mice, Mice, Inbred C57BL, Random Allocation, Transfection, Cancer Vaccines therapeutic use, Enterotoxins immunology, Glycosylphosphatidylinositols immunology, Lymphoma therapy
- Abstract
Objective: To prepare the SEA-TM and mB7.1-GPI dual-anchored EL-4 cell vaccine and to investigate its antitumor effects., Methods: mB7.1-GPI-anchored EL-4 cell vaccine, SEA-TM-anchored EL-4 cell vaccine, SEA-TM and mB7.1-GPI dual-anchored EL-4 cell vaccine were prepared. In vitro the biological activities of these vaccines were measured using a lymphocyte proliferation assay and cytokine release assay on splenocytes derived from C57BL/6 mice. The splenocytes were co-cultured with EL-4 or EL-4/mB7.1-GPI or EL-4/SEA-TM or EL-4/SEA-TM + mB7.1-GPI (treated with Mitomycin C). Lymphocyte proliferation was determined with MTT assay, the concentrations of cytokines (IL-2 and IFN-gamma) were measured using a ELISA technique. Forty C57BL/6 mice were inoculated with EL-4 cells, after 3 days the mice were randomly divided into 5 groups with 8 in each and were treated with PBS, EL-4 cell vaccine, EL-4/mB7.1-GPI cell vaccine, EL-4/SEA-TM cell vaccine and EL-4/SEA-TM + mB7.1-GPI cell vaccine respectively, vaccines were injected three time with two-day interval. Animals were observed daily, tumor sizes were measured every third day. Twenty-five days after tumor challenge, 3 mice in each group were sacrificed and splenic lymphocytes were isolated to examine the activity of natural killer cells (NK) and cytolytic T lymphocytes (CTL). The survival of the remaining 5 mice in each group was observed till the 90th day., Results: mB7.1-GPI or/and TM-SEA fusion protein was stably anchored onto the surface of EL-4 tumor cells. EL-4/mB7.1-GPI or EL-4/SEA-TM had a stronger ability to stimulate lymphocyte proliferation and IL-2 and IFN-gamma production than EL-4 (P < 0.05); while EL-4/SEA-TM + mB7.1-GPI showed a further increased ability than EL-4/mB7.1-GPI and EL-4/SEA-TM in stimulating lymphocyte proliferation and cytokine production in vitro (P < 0.05). Volume of tumor was smaller and survival time of mice was longer in EL-4/mB7.1-GPI vaccine group, EL-4/SEA-TM vaccine group and EL-4/SEA-TM + mB7.1-GPI vaccine group, comparing with PBS group and EL-4 cell vaccine group (P < 0.05). Tumor volume was much smaller and survival time of mice was much longer in EL-4/mB7.1-GPI + mB7.1-GPI vaccine group, comparing with EL-4/SEA-TM vaccine group and EL-4/mB7.1-GPI vaccine group (P < 0.05). Lymphocytes derived from the mice treated with EL-4/SEA-TM + mB7.1-GPI showed much higher NK activity and CTL activity than those derived from EL-4/mB7.1-GPI vaccine group and EL-4/SEA-TM vaccine group (P < 0.05), meanwhile the NK activity and CTL activity of EL-4/mB7.1-GPI vaccine group and EL-4/SEA-TM vaccine group was higher than EL-4 vaccine group (P < 0.05)., Conclusion: mB7.1-GPI or/and SEA-TM fusion protein was stably anchored onto the surface of EL-4 tumor cells. The tumor cell vaccines prepared from these cells exhibited antitumor effect. The mB7.1-GPI and SEA-TM dual-anchored tumor cell vaccine had much stronger antitumor effect than the single-anchored tumor cell vaccine.
- Published
- 2004
36. [Gene transfer by novel non-viral vector polyethylenimine].
- Author
-
Li JZ, Wang QQ, Yu H, Shen FP, Li D, and Zheng Y
- Subjects
- Animals, COS Cells, Cell Survival, Chloroquine pharmacology, Culture Media, Magnesium pharmacology, Mice, NIH 3T3 Cells, Osmolar Concentration, Gene Transfer Techniques, Polyethyleneimine pharmacology
- Abstract
Objective: To investigate the influencing factors of polyethylenimine (PEI) in gene transfer in vitro., Methods: Cytotoxic effects of PEI on in vitro cultured NIH 3T3 cells were quantified by MTT assay. The interaction between PEI and DNA at different charge ratios was analyzed by agarose gel electrophoresis retardation assay. The expression of gene transfer was monitored in Cos-7 cells using pEGFP and pSV beta plasmids as the reporter gene systems. Influences of chloroquine, albumin, serum, salt ion strength, and Mg(2+) ion and other factors on PEI/DNA transfer efficiency were evaluated., Result: The survival rate of NIH3T3 cells at 6 mg/L of PEI was 64.2% and at 7 mg/L of PEI was 54.4%. Gel electrophoresis retardation assays showed that PEI completely retarded DNA migration at 3.0 PEI nitrogen per DNA phosphate. Chloroquine enhanced the transfection efficiency of PEI. Albumin and serum in the culture medium decreased the transfection efficiency. HBS(HEPES buffered solution) or 150 mmol/L NaCl as the dilution solution of PEI/DNA was superior over 278 mmol/L glucose solution in the transfection efficiency. Mg(2+) in the dilution solution decreased the transfer efficiency of PEI/DNA., Conclusion: PEI is efficient gene transfer agent of eukaryotes in vitro, and can be possibly used in vivo.
- Published
- 2004
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