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Search Results: 1 - 10 of 140263 matches for " Xue-Li Bai "
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Sister Mary Joseph’s nodule as a first sign of pancreatic cancer
Xue-Li Bai,Qi Zhang,Waqas Masood,Noman Masood
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i45.6686
Abstract: Sister Mary Joseph’s nodule (SMJN) refers to a metastatic tumor of the umbilicus. It is a rare entity which arises from a malignancy in the intra-abdominal cavity. We herein describe a patient who presented with SMJN as his first sign of pancreatic cancer. It is an even more unusual case of SMJN. We therefore, suggest that pancreatic cancer should be included in the differential diagnosis when an umbilical mass is found. With the progress made in surgical procedures and other modalities, an early diagnosis will dramatically improve the prognosis of the patients.
Global Uniqueness and Solvability for Tensor Complementarity Problems
Xue-Li Bai,Zheng-Hai Huang,Yong Wang
Mathematics , 2015,
Abstract: Recently, the tensor complementarity problem (TCP for short) has been investigated in the literature. An important question involving the property of global uniqueness and solvability (GUS-property) for a class of TCPs was proposed by Song and Qi in their paper "Properties of Some Classes of Structured Tensors". In the present paper, we give an answer to this question by constructing two counter-examples. We also show that the solution set of this class of TCPs is nonempty and compact. In particular, we introduce a class of related structured tensors, and show that the corresponding TCP has the GUS-property.
Exceptionally Regular Tensors and Tensor Complementarity Problems
Yong Wang,Zheng-Hai Huang,Xue-Li Bai
Mathematics , 2015,
Abstract: Recently, many structured tensors are defined and their properties are discussed in the literature. In this paper, we introduce a new class of structured tensors, called exceptionally regular tensor, which is relevant to the tensor complementarity problem. We show that this class of tensors is a wide class of tensors which includes many important structured tensors as its special cases. By constructing two examples, we demonstrate that an exceptionally regular tensor can be, but not always, an $R$-tensor. We also show that within the class of the semi-positive tensors, the class of exceptionally regular tensors coincides with the class of $R$-tensors. In addition, we consider the tensor complementarity problem with an exceptionally regular tensor or an $R$-tensor or a $P_0+R_0$-tensor, and show that the solution sets of these classes of tensor complementarity problems are nonempty and compact.
Sphincter of Oddi laxity: An important factor in hepatolithiasis
Ting-Bo Liang, Yu Liu, Xue-Li Bai, Jun Yu, Wei Chen
World Journal of Gastroenterology , 2010,
Abstract: AIM: To evaluate the importance of sphincter of Oddi laxity (SOL) in hepatolithiasis (HL).METHODS: Subjects included 98 patients diagnosed with HL between 2002 and 2007. Detailed histories were taken and the subjects were monitored until July 2008. HL patients were divided into two groups: Group I included 45 patients with SOL, and Group II included 53 patients without. Recurrence and reoperation indices of both groups were calculated and compared.RESULTS: The recurrence index was 0.135 in Group I and 0.018 in Group II (P < 0.001). The reoperation index was 0.070 in Group I and 0.010 in Group II (P < 0.001). The mean frequency of biliary operation was 2.07 in Group I and 1.21 in Group II (P = 0.001). Differences between the two groups are significant.CONCLUSION: HL patients with SOL tend to have a higher risk of recurrence and a larger demand for reoperation than those without this condition.
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.
Correlation of Chimerism with Acute Graft-versus-Host Disease in Rats following Liver Transplantation
Fei Xue,Wei Chen,Xue-Li Bai,Guo-Dong Xu,Liang Liang,Ting-Bo Liang
International Journal of Hepatology , 2011, DOI: 10.4061/2011/947150
Abstract: The accurate diagnosis of acute graft-versus-host disease following liver transplantation (LTx-aGVHD) has been hampered. Chimerism appears in the majority of recipients after LT and its significance in the diagnosis of LTx-aGVHD has not been clearly established. To demonstrate the significance of chimerism on the diagnosis of LTx-aGVHD, we compared the change of chimerism in syngeneic LT recipients, semiallogeneic LT recipients, and LTx-aGVHD induced recipients. Chimerism in PBMCs following sex-mismatched LT was identified by real-time PCR based on a rat Y-chromosome-specific primer. All recipients in semiallogeneic group grew in a normal pattern. However, when 4×108 donor splenocytes were transferred simultaneously during LT, the morbidity of lethal aGVHD was 100%. The chimerism appeared slightly higher in the semiallogeneic group than in the syngeneic LT group, but the difference was not significant. However, when the recipients developed lethal aGVHD after LT, chimerism in the PBMCs increased progressively, and even at an early time, a significant increase in chimerism was observed. In conclusion, high level chimerism correlated well with LTx-aGVHD, and detection of chimerism soon after transplantation may be of value in the diagnosis of LTx-aGVHD prior to the onset of symptoms.
Correlation of Chimerism with Acute Graft-versus-Host Disease in Rats following Liver Transplantation
Fei Xue,Wei Chen,Xue-Li Bai,Guo-Dong Xu,Liang Liang,Ting-Bo Liang
International Journal of Hepatology , 2011, DOI: 10.4061/2011/947150
Abstract: The accurate diagnosis of acute graft-versus-host disease following liver transplantation (LTx-aGVHD) has been hampered. Chimerism appears in the majority of recipients after LT and its significance in the diagnosis of LTx-aGVHD has not been clearly established. To demonstrate the significance of chimerism on the diagnosis of LTx-aGVHD, we compared the change of chimerism in syngeneic LT recipients, semiallogeneic LT recipients, and LTx-aGVHD induced recipients. Chimerism in PBMCs following sex-mismatched LT was identified by real-time PCR based on a rat Y-chromosome-specific primer. All recipients in semiallogeneic group grew in a normal pattern. However, when donor splenocytes were transferred simultaneously during LT, the morbidity of lethal aGVHD was 100%. The chimerism appeared slightly higher in the semiallogeneic group than in the syngeneic LT group, but the difference was not significant. However, when the recipients developed lethal aGVHD after LT, chimerism in the PBMCs increased progressively, and even at an early time, a significant increase in chimerism was observed. In conclusion, high level chimerism correlated well with LTx-aGVHD, and detection of chimerism soon after transplantation may be of value in the diagnosis of LTx-aGVHD prior to the onset of symptoms. 1. Introduction Acute graft-versus-host disease (aGVHD) is an uncommon but devastating complication that occurs in 1-2% of recipients after liver transplantation (LTx-aGVHD) in clinical course [1]. LTx-aGVHD symptoms usually appear 2 to 6 weeks after transplantation and are characterized by fever, skin rash, diarrhea, and pancytopenia. These symptoms may initially be difficult to differentiate from cytomegalovirus disease or drug-induced rash and pancytopenia. The accurate diagnosis of LTx-aGVHD has been hampered due to the lack of a sensitive and specific diagnostic test, and misdiagnosis may incur delayed treatment and diminish the chance of patient survival. Previous studies showed that the underdiagnosis of LTx-aGVHD is responsible for patients’ mortality rates to be as high as 85% [2–4]. In our center, the liver transplantation program was established in 1993. We have identified 3 patients with LTx-aGVHD, and all died from infection, alimentary tract bleeding, or multiple organ failure [5]. Since LTx-aGVHD results from the engraftment of T lymphocytes associated with the liver graft, the demonstration of substantial donor T-lymphocyte chimerism may be of value in the diagnosis of this disease [6–17]. However, chimerism appears only transiently in the majority of patients in
Distribution of arbuscular mycorrhizal fungi and soil enzyme activities in the rhizosphere of Artemisia ordosica in desert
荒漠油蒿(Artemisia ordosica)根围AM真菌分布与土壤酶活性

SHAN Bao-Qin,HE Xue-Li,BAI Chun-Ming,ZHAO Li-Li,
山宝琴
,贺学礼,白春明,赵丽莉

生态学报 , 2009,
Abstract: Soil samples in the rhizosphere of Artemisia ordosica distributed in west and northwest China desert were collected in October 2007 to isolate arbuscular mycorrhizal(AM) fungi, and to determine the soil enzyme activity in 0-10, 10-20, 20-30, 30-40 and 40-50 cm soil layers. The results showed that AM fungi had a relatively high hyphal colonization rate on the roots of A. ordosica, and the hyphal colonization rate was significantly and positively correlated with vesicular colonization rate. However, the colonization of hyphae, vesicles and arbuscules was not correlated to spore density and soil enzyme activities, while spore density was different among sites and soil depths, and was significantly and positively correlated with available P, N, and organic matter contents, urease and acid phosphatase activites. The correlation between the spore density and alkaline phosphatase activity was affected by pH. The maximal value of spore density occurred at the 0-10cm layer, and then gradually decreased with soil depth.The soil enzyme activities showed the same trend as the spore distribution. There was an obviously positive correlation between the activity of the three soil enzymes and soil fertility. This suggests that A. ordosica could establish well symbiosis with AM fungi, which was the main reason for maintaining integrity and stability of the desert ecosystem.
Spatial distribution of arbuscular mycorrhizal fungi in Astragalus adsurgens root-zone soil in Mu Us sand land.
毛乌素沙地沙打旺根围AM真菌的空间分布

HE Xue-li,BAI Chun-ming,ZHAO Li-li,
贺学礼
,白春明,赵丽莉

应用生态学报 , 2008,
Abstract: This paper studied the spatial distribution of arbuscular mycorrhizal (AM) fungi in Astragalus adsurgens root-zone soil in Mu Us sand land under five different ecological conditions. The results showed that the colonization and spore density of AM fungi differed significantly with sampling sites and soil depths. The highest colonization rate and spore density of AM fungi were found in 10-30 cm soil layer, and the highest spore density was at Dingbian site. Ningtiaoliang and Tawan sites had the highest vesicular colonization, and Tawan site had the highest total and hyphal colonization. The contents of total glomalin (TG) and easily extractable glomain (EEG) were the highest at Tawan site, being 1.18 mg·g-1 and 0.65 mg·g-1, respectively. Soil pH had significant positive effects on the vesicular and arbuscular colonization, spore density, TG, and EEG, and the TG and EEG had significant positive correlations with spore density, soil organic carbon (SOC), and soil available N and P. The proportion of glomalin to SOC was higher in desert soils than in agricultural soils, which implied that glomalin could be one of the main origins of SOC in desert ecosystem. Therefore, glomalin could be a useful index for the evaluation of soil AM fungal activity and soil ecology.
Effects of long-term fertilization on r-K strategy microbial populations in farmland mollisol
长期施肥对农田黑土r-K策略菌群的影响

ZHANG Ming,BAI Zhen,ZHANG Wei,FENG Hui-min,WU Ye-ye,DING Xue-li,ZHANG Xu-dong,
张明
,白震,张威,冯慧敏,武叶叶,丁雪丽,张旭东

生态学杂志 , 2007,
Abstract: The microbial communities in agricultural soils are responsible for nutrient cycling,and thus,are the important indicators of soil fertility.In this paper,the effects of long-term fertilization on the r-K strategy populations and eco-physiological functional groups of bacteria and fungi in farmland Mollisol were investigated,and the results showed that fertilization decreased the evenness and richness of the fungal and bacterial populations,and the decrements of the bacterial and fungal eco-physiological(EP)indices were 0.019-0.106 and 0.023-0.185,respectively.The amounts of K strategy microbial populations in all treatments were higher than those of r strategy ones.Fertilization caused the increase of r strategy bacteria but the decrease of r strategy fungi.Compared with the control,applying medium amount of manure had the greatest increase of r-K strategy bacteria and K strategy fungi.The amounts of r-K strategy bacteria and K strategy fungi were higher under the combined application of chemical fertilizers and manure than under the application of chemical fertilizers.Under the conditions of K-strategists being predominant,the application of chemical fertilizers enhanced the r-strategy microbial proportion,while the combined application of chemical fertilizer and manure enhanced the ratio of K-strategists.Correlation analysis showed that K-strategy microbial populations had a significant positive correlation(P<0.01)with soil nitrogen content,suggesting that K-strategists might be the key microbial populations in soil nitrogen cycling.
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