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Search Results: 1 - 10 of 262361 matches for " WANG Da-Li "
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A Wang Da-li,Zhu Xin-ru,

植物生态学报 , 1996,
Abstract: 本文研究了在我国东北地区广泛蔓延的菊科杂草──三裂叶豚草(Ambrosiatrifida)对大豆、玉米、小麦、水稻的化感作用(Allelopathy)。通过对三裂叶豚草的不同部位(挥发物、茎叶、根、根区土壤)的化感活性的研究,发现三裂叶豚草的挥发物和根区土壤对作物无明显的作用;茎叶部分的水浸液对实验作物的种子萌发和幼苗的纳根伸长有明显的抑制作用,同时使根系形态发生较大的变化;根的水浸液对作物的幼芽伸长有一定的促进作用。在上述的研究基础上,对个同的活性组分进行了GC、GC/MS分析,结果表明主要的化感成分可能为。α-蒎烯。β-蒎烯、2-冰片烯、里那醇、冰片、4-萜品醇、樟脑、α-萜品醇、马鞭烯酮、橙花叔醇、法尼烯。勺叶桉醇等。由此我们分析三裂叶豚草主要是通过雨水淋溶的方式向周围环境释放化感物质,从而对其它植物产生影响,加强自身在自然界的竞争力.
Correctness Study on Nested Transaction Model and Locking Protocol

WANG Hong-yuan,CHAI Sheng,LI Da-li,

计算机应用研究 , 2005,
Abstract: As one of the extended transaction models,nested transaction is used widely.Expatiate on the correctness of nested transaction,and presant a concurrency control protocol of locks in nested transaction model.

WANG Yi-wei
, LIU Da-li, SHU Rong

- , 2017, DOI: 10.3969/j.issn.1674-8115.2017.04.007
Abstract: 目的 ·分离牙龈卟啉单胞菌(Pg)脂多糖(LPS)及荚膜多糖(CPS),分析两者体外诱导人单核细胞系THP-1细胞分泌IL-8的能力。方法 ·采用凝胶过滤色谱法分离已获得的Pg ATCC33277及SJD4多糖混合物,并作用于THP-1细胞。采用ELISA法检测THP-1细胞在不同菌株LPS和CPS的不同浓度及不同作用时间下,其上清液中IL-8的含量。结果 ·成功分离获得ATCC33277及SJD4的LPS及CPS,其相对分子质量分别为20 000~50 000及150 000~500 000;分离所得LPS及CPS均具有体外诱导THP-1细胞分泌IL-8的能力,且存在时间-剂量效应;在0.1 μg/mL浓度下,模式菌株ATCC33277的LPS诱导能力均显著高于其CPS(均P<0.05),而临床菌株SJD4在作用24 h时其CPS的诱导能力显著高于LPS(P<0.05)。结论 · CPS作为Pg多糖提取物的组成成分,可单独体外诱导THP-1细胞分泌IL-8,且存在时间-剂量效应。
: Objective · To isolate lipopolysaccharide (LPS) and capsular polysaccharide (CPS) from Porphyromonas gingivalis (Pg) and analyze their ability to induce THP-1 cells to secrete interleukin 8 (IL-8) in vitro. Methods · LPS and CPS were isolated from the polysaccharides by gel filtration chromatography, which had already been extracted from Pg ATCC33277 and SJD4. The isolated LPS and CPS from different strains were used to stimulate THP-1 cells in different doses and for different periods. The level of IL-8 in the cell culture suspension was measured by ELISA. Results · LPS and CPS were successfully separated from the polysaccharides in Pg ATCC33277 and SJD4. The relative molecular masses of LPS and CPS were 20 000–50 000 and 150 000–500 000, respectively. LPS and CPS could induce THP-1 cells to produce IL-8 in vitro in a time- and dose-dependent manner. The effect of LPS from ATCC33277 on secretion of IL-8 was greater than that of CPS with the dose of 0.1 μg/mL (P<0.05). However, the difference could only be found at 24 h in SJD4, and the effect of CPS was greater (P<0.05). Conclusion · As a component of polysaccharides extracted from Pg, CPS can induce THP-1 cells to secrete IL-8 in vitro in a time- and dose-dependent manner
Overexpression of RNF146 in Non-Small Cell Lung Cancer Enhances Proliferation and Invasion of Tumors through the Wnt/β-catenin Signaling Pathway
Ying Gao, Chengyang Song, Linping Hui, Chun-yu Li, Junying Wang, Ye Tian, Xu Han, Yong Chen, Da-Li Tian, Xueshan Qiu, Enhua Wang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0085377
Abstract: Studies have suggested a possible correlation between the newly identified E3 ubiquitin ligase ring finger protein 146 (RNF146) and tumor development. However, until now, studies on RNF146 have been restricted to poly(ADP-ribosyl)ation and ubiquitin ligation, whereas the role of RNF146 in tumor biology has rarely been reported. In the present study, the role of RNF146 in non-small cell lung cancer (NSCLC) was investigated. The results showed that the expression of RNF146 was increased in clinical lung cancer samples and cell lines. RNF146 expression correlated with tumor size, differentiation level, lymphatic metastasis, pTNM staging, and prognosis of patients in stage I. RNF146 expression was negatively correlated with Axin expression but positively correlated with the nuclear expression of β-catenin in NSCLC tissues. RNF146 downregulated the expression of Axin in lung cancer cell lines and induced the expression and nuclear distribution of β-catenin. Overexpression of RNF146 in NSCLC cell lines increased the levels of cyclinD1, cyclinE, and CDK4, promoted cell cycle G0/G1-S transitions, and regulated cell proliferation. Overexpression of RNF146 led to upregulated levels of matrix metalloproteinases 2 and 7 and enhanced lung cancer cell invasiveness, events that were mediated by the classical Wnt/β-catenin signaling pathway. In summary, the data in the present study indicate that RNF146 regulated the development and progression of NSCLC by enhancing cell growth, invasion, and survival, suggesting that RNF146 may be a potential treatment target in NSCLC.
Prevalence of canine leishmaniasis in Beichuan County, Sichuan, China and phylogenetic evidence for an undescribed Leishmania sp. in China based on 7SL RNA
Ke Sun, Wang Guan, Jian-Guo Zhang, Ya-Jing Wang, Yu Tian, Lin Liao, Bin-Bin Yang, Da-Li Chen, Jian-Ping Chen
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-75
Abstract: In this study, rK39 dip-stick, ELISA and PCR methods were used to investigate the prevalence of canine leishmaniasis (CanL) in Beichuan County, Sichuan Province, China.Among the 86 dogs which were included in the study, 13 dogs were positive using the dip-stick test (15.12%), while 8 dogs were positive using ELISA (9.30%) and 19 dogs were positive for PCR (22.03%). In total, 32 dogs were positive for one or more tests (37.21%). Interestingly, phylogenetic analysis based on the partial 7SL RNA fragment provided evidence that an undescribed Leishmania species, which is clearly a causative agent of CanL and human visceral leishmaniasis, does exist in China. This result is consistent with our previous study.Our work confirmed that canine leishmaniasis is still prevalent in Beichuan County. Further control is urgently needed, as canine leishmaniasis is of great public health importance. The phylogenetic analysis based on 7SL RNA segment provides evidence for the existence of an undescribed Leishmania sp. in China.Leishmaniasis is a vector-borne disease caused by different species of the genus Leishmania, including subgenera Viannia and Leishmania. The diseases are characterized by a spectrum of clinical manifestations: cutaneous leishmaniasis (CL), mucocutaneous leishmaniasis (MCL) and visceral leishmaniasis (VL) [1]. Globally, leishmaniasis affects 88 countries, which is an estimated 500,000 cases of VL and 1–1.5 million cases of CL each year [2]. Epidemiologically, canines are the major reservoirs of Leishmania, the etiological agent of human visceral leishmaniasis [3-7]. Following the accelerating urbanization and population mobility, canine leishmaniasis is epidemic in America, Asia and Europe [8-14].Leishmaniasis is still endemic in China, especially in the west and northwest regions. The prevalence of human leishmaniasis in west China was alarming according to the reports of Wang et al. [15] and Qu et al. [16]. Moreover, as our previous study [17,18] indicated, Lei
Structure and magnetic properties of Sm2Fe17-xCrxcompound prepared by arc melting

Hao Yan-Ming,Wang Ling-Ling,Yan Da-Li,An Li-Qun,

物理学报 , 2009,
Abstract: 通过X射线衍射、磁测量等手段对电弧炉制备的不同热处理条件的Sm2Fe17-xCrx(x=1—3)化合物的结构和磁性进行了研究.结果表明1050 ℃下退火5 d的Sm2Fe17-xCrx(x=1—3)化合物具有菱方相的Th2Zn17型结构,同样温度下退
Preparation and Characterization of Transparent Conductive Nb-Doped ZnO Films by Radio-Frequency Sputtering

CAO Feng,WANG Yi-Ding,LIU Da-Li,YIN Jing-Zhi,GUO Bao-Jia,LI Lei,AN Yu-Peng,

中国物理快报 , 2009,

MEI Li,WANG Zheng-Quan,CHENG Yun-Huan,Guo Da-Li,

植物生态学报 , 2004,
Abstract: 细根周转要消耗大量的C,它影响森林生态系统C分配格局与过程和养分循环,对生态系统生产力具有重要意义.细根的周转取决于细根的寿命,细根寿命越短,周转越快,根系对C的消耗也越多.大量研究表明,细根的寿命与地上部分C向根系供应的多少有密切关系,同时也与细根直径大小、土壤中N和水分的有效性、土壤温度以及根际周围的土壤动物和微生物的活动有关.本文综述了国外近年来在该领域里的研究进展,特别是对控制细根寿命的机理和主要影响因子进行了评述,目的是引起国内研究者的关注,促进我国根系生态学的研究与发展.
Magnetic properties and thermal expansion anomaly of Er2AlFe16-xMnx compounds

Hao Yan-Ming,Zhao Miao,Fu Bin,Wang Lin,Yan Da-Li,

物理学报 , 2006,
Abstract: 通过X射线衍射及磁测量手段研究了Er2AlFe16-xMnx(x=1,2,3,4,6,8)化合物的结构和磁性. 研究结果表明Er2AlFe16-xMnx化合物具有六角相的Th2Ni17型结构. 采用X射线热膨胀测定法在103—654K的温度范围内测量了Er2AlFe16-xMnx(x=1,2,3,4)化合物的热膨胀性质,发现这些化合物在低温下存在热膨胀反常现象,在居里点附近具有负膨胀性质. 对自发磁致伸缩的研究结果表明Er2AlFe16-xMnx化合物中存在着较强的各向异性的自发磁致伸缩,低温下自旋重取向的出现使得化合物的自发体磁致伸缩有所增强. 磁测量结果表明Mn的替代导致Er2AlFe16-xMnx化合物的居里温度及自发磁化强度急剧下降,并且使得化合物的磁晶各向异性发生显著改变.
The structure, magnetic properties, and positron annihilation spectra of Tb2AlFe16-xMnx compounds

Hao Yan-Ming,Yan Da-Li,Fu Bin,Wang Li-Qun,Hao Xiao-Peng,Wang Bao-Yi,

物理学报 , 2009,
Abstract: 通过X射线衍射、磁测量及正电子湮没谱等手段研究了Tb2AlFe16-xMnx(x=1—8)化合物的结构和磁性.X射线衍射研究结果表明Tb2AlFe16-xMnx化合物具有六角相的Th2Ni17型结构.室温下的正电子湮没实验研究表明,Mn对Fe的替代导致化合物中的铁磁相互作用减弱,并且化合物中存在着较强烈的磁弹耦合效应.磁测量研究结果表明,Mn的替代导致Tb2AlFe16-xMnx化合物的居里温度及自发磁化强度急剧下降.
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