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Search Results: 1 - 10 of 151154 matches for " HE Xue-Li "
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Effects of AM fungi on the growth and protective enzymes of cotton under NaCl stress

HE Xue-Li,

生态学报 , 2005,
Abstract: The effects of AM fungi on the growth and protective enzymes in cotton plants inoculated Glomus mosseae and Glomus caledonium under salt-caused stress conditions was studied at the levels of 0,0.1%,0.2%,0.3% NaCl added to the soil for the potted plant. The results showed that application amount of NaCl significantly influenced the growth of cotton plants and inoculation effect of AM fungi. After inoculation mycorrhizal infection rate was promoted, and total dry weights and output of cotton were increased, w...
Diversity of arbuscular mycorrhizal fungi associated with clonal plants in Mu Us Sandy Land

ZHAO Jin-Li,HE Xue-Li,

中国生态农业学报 , 2013,
Abstract: Arbuscular mycorrhizal (AM) fungi is important in maintaining the functions and biodiversity of arid-land ecosystems and is also an indispensable factor in the restoration and reestablishment of vegetation. In particular, AM fungi are ubiquitous symbiotic fungi and plants. Clonal plants possess wider ecological neighborhoods than non-clonal plants. Clonal plants constitute a form of resource for the restoration of the Mu Us Sandy Land. Clonal plants have been identified as the driver of change in community environments and greatly contribute to the maintenance of community functions in the restoration process of vegetation. Clonal plants considerably enhance the ability of self-rehabilitation of sandy landscapes. To elucidate species diversity and ecological distribution of AM fungi associated with 3 kinds of clonal plants (Psammochloa villosa, Hedysarum leave, Artemisia ordosica) in Mu Us Sandy Land, two representative sites (Research Station and Yulin) were selected from the northeast and southwest of Mu Us Sandy Land. Soil samples at 50 cm depth of rhizosphere of clonal plants were collected in 4 replicates at each location and divided into sections corresponding to 0~10 cm, 10~20 cm, 20~30 cm, 30~40 cm, 40~50 cm depths in May, July and October 2006. A total of 23 AM fungal species belonging to 4 genera were isolated and identified. Of these, 15 species belonged to Glomus, 5 to Acaulospora, 2 to Gigaspora, and 1 to Scutellospora. G. mosseae was the dominant species in the P. villosa rhizosphere; G. melanosporum was the common species in the rhizosphere of 3 kinds of clonal plants. The ecological distributions were different among species and AM fungi genera. AM fungi spore density, species richness and species diversity index were highest in H. leave rhizosphere in the Research Station. The results showed that AM fungal species diversity was rich in clonal plant rhizospheres in Mu Us Sandy Land. Also the spatial distribution dynamics of AM fungal species in Mu Us Sandy Land was significant. This paper described the diversity and distribution of AM fungi in the rhizospheres of three kinds of clonal plants, which provided the basis for reestablishing ecosystems and sustaining economic development in Mu Us Sandy Land.
The spatio\|temporal distribution of arbuscular mycorrhiza fungi and glomalin in the rhizosphere of Artemisia ordosica in desert

CHENYING,HE Xue-li,and,

生态学报 , 2009,
Abstract: In this paper, the spatio\|temporal distribution of arbuscular mycorrhiza (AM) fungi and glomalin in rhizosphere of Artemisia ordosica and its relationship with soil factors were investigated in sand soil north to Yulin city, Shanxi, China. In April, July and October, 2007, soil samples around rhisophere of A.ordosica were collected. Each time, the soil was divided into five layers on the basis of depth from top to bottom: 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm, 40-50 cm, respectively. The results showed that the total colonization rate (89.54%), vesicular colonization rate (26.24%) and arbuscule colonization rate (21.08%) of AM fungi were very high around rhisophere of A.ordosica, and spore number was 2.91-6.17 per gram soil, indicating that AM fungi established well symbiosis with rhisophere of A. ordosica. Twenty\|one species of AM fungi in four genera were detected in soil samples, the predominant genera and predominant species was Glomus and G. geosporum, respectively. Distribution of AM fungi and glomalin was remarkably heterogeneous and closely related with soil factors. Hypha colonization increased gradually with season. Vesicular colonization rate and arbuscule colonization rate were at their lowest level in summer and higher in spring and autumn, seasonal variation of spore density was in a reverse pattern. Total extractable glomalin (TEG) was negatively correlated with soil depth, the highest value was in surface (0-20 cm) layer. Easy\|extracted glomalin (EEG) content showed a fluctuation with soil depth. The TEG content was high in spring and decreased in summer and autumn. TEG and EEG were remarkably correlated with soil nutrition, soil enzyme activity and spore density of AM fungi, in future research, they can be used as parameters to monitor the development of AM fungi community, organic carbon dynamic and nutrition cycle in sand soil.
A New Species of the Genus Hedinia Ostenf.(Cruciferae) from Xizang

He Xue-li,An Zheng-xi,

中国科学院研究生院学报 , 1996,
A Trust-based Resource Allocation Model in Grid Computing Systems

GUO Xue-li,YANG Hui,HE Peng,

计算机应用研究 , 2005,
Abstract: Aiming at the problems about resource allocuting on resource management,advances a new design idea of adding security controlling and load balancing during allocating resources,which promotes the running efficiency and security of the grid computing system.
Endoplasmic reticulum stress sensitizes human esophageal cancer cell to radiation
Xue-Li Pang,Gang He,Yang-Bo Liu,Yan Wang
World Journal of Gastroenterology , 2013, DOI: 10.3748/wjg.v19.i11.1736
Abstract: AIM: To investigate the role of endoplasmic reticulum (ER) stress in cancer radiotherapy and its molecular mechanism. METHODS: Tunicamycin (TM) was applied to induce ER stress in human esophageal cancer cell line EC109, and the radiosensitization effects were detected by acute cell death and clonogenic survival assay. Cell cycle arrest induced by TM was determined by flow cytometric analysis after the cellular DNA content was labeled with propidium iodide. Apoptosis of EC109 cells induced by TM was detected by annexin V staining and Western blotting of caspase-3 and its substrate poly ADP-ribose polymerase. Autophagic response was determined by acridine orange (AO) staining and Western blotting of microtubule-associated protein-1 light chain-3 (LC3) and autophagy related gene 5 (ATG5). In order to test the biological function of autophagy, specific inhibitor or Beclin-1 knockdown was used to inhibit autophagy, and its effect on cell apoptosis was thus detected. Additionally, involvement of the phosphatidylinositol-3 kinase (PI3K)/Akt/mammalian target of the rapamycin (mTOR) pathway was also detected by Western blotting. Finally, male nude mice inoculated subcutaneously with EC109 cells were used to confirm cell model observations. RESULTS: Our results showed that TM treatment enhanced cell death and reduced the colony survival fraction induced by ionizing radiation (IR), which suggested an obvious radiosensitization effect of TM. Moreover, TM and IR combination treatment led to a significant increase of G2/M phase and apoptotic cells, compared with IR alone. We also observed an increase of AO positive cells, and the protein level of LC3-II and ATG5 was induced by TM treatment, which suggested an autophagic response in EC109 cells. However, inhibition of autophagy by using a chemical inhibitor or Beclin-1 silencing led to increased cell apoptosis and decreased cell viability, which suggested a cytoprotective role of autophagy in stressed EC109 cells. Furthermore, TM treatment also activated mTORC1, and in turn reduced Akt phosphorylation, which suggested the PI3K/Akt/mTOR signal pathway was involved in the TM-induced autophagic response in EC109 cells. Tumor xenograft results also showed synergistic retarded tumor growth by TM treatment and IR, as well as the involvement of the PI3K/Akt/mTOR pathway. CONCLUSION: Our data showed that TM treatment sensitized human esophageal cancer cells to radiation via apoptosis and autophagy both in vitro and in vivo.
Innate immune response to dengue virus
Xue-li ZHENG
Medical Journal of Chinese People's Liberation Army , 2012,
Abstract: Dengue fever/dengue hemorrhagic fever (DF/DHF) has emerged as the most important mosquito-borne viral diseases in tropical areas. DF/DHF is one of the problems which severely threaten public-health world-wide. To understand innate immune response of the body to pathogens is of significant significance in controlling dengue virus infection. The invasion of the virus to the host cell is the first and critical stage in the infectious process and the mechanism and identity of cellular proteins involved in this process remain largely unknown. Interstitial dendritic cells (DCs) are target cells for DF and also believed to constitute the first line of the innate host defense against invasion of dengue viruses. There are two innate immune pathways that activate the host innate immunity against viral infection. One of the pathways utilizes members of the Toll-like receptor (TLR) family to detect viruses that enter the endosome through endocytosis and induce production of interferon (IFN) by signal protein, and finally activates translation factors such as NF-κB, interferon regulatory factor (IRF) 7 and IRF5. The other antiviral pathway involves the RNA helicase RIG-I as the receptor for intracellular viral double-stranded RNA (dsRNA). The closely related microRNA (miRNA) and RNAi pathways have emerged as important regulators of virus–host cell interactions.
Image scrambling degree evaluation method based on GRA

MA Miao,TAN Yong-jie,HE Xue-li,

计算机应用研究 , 2009,
Abstract: In order to evaluate the image scrambling degree effectively, introducing the grey relation analysis theory, and then suggested a new method of image scrambling. The method firstly divided the scrambled image into several blocks, then computed the average of every line pixel values in the sub-images to static the gray information sequence of each blocks, and made these sequences be small samples sequences. Finally calculated the gray relevancy of every two sequences using gray relation analysis to evaluate the image scrambling degree. Experimental results show that the method can efficiently evaluate the scrambling effect of different scrambling transformation, running without the origin image involved. Compared with SNR, it can eva-luate the scrambling effect more objectively and be consistent with the perception of human visual system.
Diversity and spatial distribution of arbuscular mycorrhizal fungi of Caragana korshinskii in the Loess Plateau

HE Xue-Li,ZHAO Li-Li,YANG Hong-Yu,

生态学报 , 2006,
Abstract: The diversity and spatial distributions of arbuscular mycorrhizal fungi of Caragana korshinskii were investigated in four natural environments of the Loess Plateau, such as Ansai, Suide, Hengshan and Yulin of Shaanxi province. There are 4 genera and 11 species of AM fungi were isolated from the soil samples under the Caragana korshinskii, 3 species of them belong to Acaulospora, 1 species belong to Gigasporn, 5 species belong to Glomus and 2 species belong to Sctaellospora. The result showed that the G. constrictum and G. mosseae are dominant species; the different species of AM fungi appeared in the different ecological environments, such as A. spinosa and S. calospora only occur in Suide site, A. lacunosa only occurs in Hengshan site, Gi. decipiens and S. erythropa only occur in Ansai site. Different sample sites had significantly affected on spore density and the percentage of colonization of vesicle and arbuscular of AM fungi. The highest value of spore density and vesicular colonization was in Suide, and the highest arbuscular colonization was in Yulin. Soil depth had a significant effect on spore density in four sites, the highest spore density existed in the 10 - 20cm soil layer; the highest percentage of colonization of AM fungi occurred at the 0 - 10cm or 20 - 30cm soil layer. Spore density was positively correlated with vesicular colonization and negatively correlated with arbuscular colonization. Spore density was also negatively correlated with soil organic matter, available P, available K and Cl^- content. Vesicular colonization had a positive correlation with soil pH and a negative correlation with soil moisture, available K and Cl^- content.
Effects of AM fungi on the growth and drought resistance of Caragana korshinskii under water stress conditions
水分胁迫下AM真菌对柠条锦鸡儿(Caragana korshinskii)生长和抗旱性的影响

HE Xue-Li,LIU Ti,AN Xiu-Juan,ZHAO Li-Li,

生态学报 , 2009,
Abstract: 利用盆栽实验研究了水分胁迫条件下AM真菌对柠条锦鸡儿(Caragana korshinskii)生长和抗旱性的影响.在土壤相对含水量为80%、60%和40%条件下,分别接种摩西球囊霉(Glomus mosseae)和柠条锦鸡儿根际土著菌,结果表明,水分胁迫对AM真菌的接种效果有显著影响.不同水分条件下,接种AM真菌显著提高了宿主植物根系菌根侵染率.土壤相对含水量为40%~60%时,接种株的株高、茎粗、生物干重和叶片保水力明显高于不接种株;接种AM真菌提高了植株对土壤有效N和有效P的利用率,增加了植株全P、叶片叶绿素和可溶性糖含量以及SOD、POD、CAT等保护酶活性.土壤相对含水量为40%时,叶片MDA含量明显下降.水分胁迫条件下,以接种柠条锦鸡儿根际土著菌的效果最佳.AM真菌增强宿主植物的抗旱性可能源于促进宿主植物根系对土壤水分和矿质元素吸收的直接作用和改善植物体内生理代谢活动、提高保护酶活性的间接作用.
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