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Search Results: 1 - 10 of 86219 matches for " LIN Hua-Feng "
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New Sharp Bounds for the Bernoulli Numbers and Refinement of Becker-Stark Inequalities
Hua-feng Ge
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/137507
Abstract: We obtain new sharp bounds for the Bernoulli numbers: 2(2)!/(2(22?1))<|2|≤(2(22?1)/22)(2)(2)!/(2(22?1)), =,
General methods for clinical effect assessment of traditional Chinese medicine
WEI Hua-Feng
Zhong Xi Yi Jie He Xue Bao , 2005,
Abstract: Along with the changes of disease spectrum, medical models and health concept, people pay more and more attention to the diagnostic and therapeutic approaches of traditional Chinese medicine (TCM). With the effect assessment being changed from disease-based model to patient-based model, how to scientifically and objectively explain the validity of TCM has become the premise for further development of TCM and dissemination of it throughout the world. In this article, the authors analyzed the status quo and problems of the effect assessment of TCM, and proposed some general methods for clinical effect assessment of TCM, including formulating criteria for syndrome differentiation under the guidance of TCM theories, paying attention to quality of life, proper selection of indexes for outcome assessment, application of modern clinical study methods, such as the methods of evidence-based medicine and clinical epidemiology, designing randomized controlled trials, multi-subject co-operation, strict supervision of the quality of researches, and establishment of organizations for professional training.
Effects of Copper Stress on the Alkaoids of Catharanthus roseus

林枫, 高媚娇, 于博帆, 陈华峰
LIN Feng
, GAO Mei-Jiao, YU Bo-Fan, CHEN Hua-Feng

植物研究 , 2016, DOI: 10.7525/j.issn.1673-5102.2016.03.009
Abstract: 以药用植物长春花为实验材料,采用珍珠岩为培养基质的营养方式培养,初步研究了长春花幼苗对铜胁迫的生长响应、吸收积累、基因表达及生物碱合成的特性。研究结果表明,在外源铜胁迫下,药用植物长春花幼苗根和叶干重表现为低浓度的上升和高浓度的降低,并在300μmol·L-1Cu时达到峰值,与对照差异显著(P<0.05)。而幼苗的根系耐性指数先上升后下降,在200μmol·L-1Cu时达到峰值。Cu金属进入长春花幼苗体内绝大部分积累在根部。长春花叶片中含有的长春碱在外源铜胁迫条件下其含量有一定程度上的增加,并且随着处理浓度的增加使之呈现出规律性变化,在300μmol·L-1Cu时达到峰值,甚至到达CK的2.7倍。结果可为进一步验证长春花是否可以作为一种新的Cu超富集植物提供参考依据。
Pathogenicity of several fungal species on Spodoptera litura.

LIN Hua-feng,YANG Xin-jun,GAO Yi-bo,LI Shi-guang,

应用生态学报 , 2007,
Abstract: The virulence test of five species of entomogenous fungi Beauveria brongniartii, Beauveria bassiana, Paecilomyces fumosoroseus, Metarhizium anisopliae and Nomuraea rileyi to Spodoptera litura larvae showed that B. brongniartii and N. rileyi had evident pathogenic effects on S. litura, with the LT50 value to S. litura 2nd instars being 2.95 and 4.10 days, and the corrected accumulative mortality of the instars being 100% and 95.2%, respectively. The virulence of B. brongniartii and N. rileyi to the 3rd instars was lower than that of 2nd instars. The LT50 value to 3rd instars was 19.67 and 19.63 days, and the corrected accumulative mortality was 56.6% and 52.2%, respectively. Other two fungal species P. fumosoroseus and B. bassiana also had virulence to S. litura larvae. The LT50 value for the 2nd instars was 4.89 and 6.34 days, and the corrected accumulative mortality reached 85.7% and 71.4%, respectively.
Finger-vein image recognition combining modified hausdorff distance with minutiae feature matching  [PDF]
Cheng-Bo Yu, Hua-Feng Qin, Lian Zhang, Yan-Zhe Cui
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.24040
Abstract: In this paper, we propose a novel method for finger-vein recognition. We extract the features of the vein patterns for recognition. Then, the minutiae features included bifurcation points and ending points are extracted from these vein patterns. These feature points are used as a geometric representation of the vein patterns shape. Finally, the modified Hausdorff distance algorithm is provided to evaluate the identifica-tion ability among all possible relative positions of the vein patterns shape. This algorithm has been widely used for comparing point sets or edge maps since it does not require point cor-respondence. Experimental results show these minutiae feature points can be used to perform personal verification tasks as a geometric rep-resentation of the vein patterns shape. Fur-thermore, in this developed method. we can achieve robust image matching under different lighting conditions.
Distribution pattern of traditional Chinese medicine syndromes in 793 patients with fatty liver disease
Hua-feng WEI,Guang JI
Zhong Xi Yi Jie He Xue Bao , 2009,
Abstract: Objective: To study the distribution pattern of traditional Chinese medicine (TCM) syndromes in fatty liver disease.Methods: A multicenter and large sample survey was carried out by adopting the model of “combining disease with syndrome”. A TCM syndrome information database was established by EPidata 3.1 software. The distribution pattern of TCM syndromes in fatty liver was studied by factor analysis and cluster analysis methods with SPSS 13.0 software.Results: The basic syndromes of fatty liver included insufficiency of liver and kidney, flaring fire due to yin deficiency, liver-qi stagnation and spleen deficiency, spleen deficiency, spleen deficiency and dampness stagnation, mild syndrome of internal accumulation of damp-heat, blood stasis, severe syndrome of internal accumulation of damp-heat, and internal stagnation of phlegm-dampness. Single syndrome and combination of two to four basic syndromes were common in fatty liver disease. The syndrome of spleen deficiency and dampness stagnation was the most frequent one when its pathogenesis was simple, while the syndrome of insufficiency of liver and kidney was most frequent one when the pathogenesis was complicated. A total of 108 patients (13.6%) had no obvious symptoms, 46 patients (5.8%) were classified into the pattern of non-categorization, and the other patients were classified into five syndromes including phlegm accumulating with stagnation due to spleen deficiency (11.5%, 91/793), yin deficiency of liver and kidney (18.5%, 147/793), retention of phlegmatic dampness due to spleen deficiency (32.0%, 254/793), internal accumulation of damp-heat due to spleen deficiency (10.2%, 81/793), and damp obstruction due to liver-qi stagnation and spleen deficiency (8.3%, 66/793).Conclusion: Multi-element analysis reveals the distribution pattern of TCM syndromes in fatty liver disease, which is worthy of further study. The basic pathogenesis is spleen deficiency, and has a close correlation with the liver and kidney. The main pathogenesis factors are phlegm, dampness, blood stasis, heat and liver-qi stagnation. Yin deficiency of liver and kidney is a typical syndrome in fatty liver disease.
Study of standardization of syndrome diagnosis: an analysis of current status
Hua-feng WEI,Guang JI
Zhong Xi Yi Jie He Xue Bao , 2007,
Abstract: ABSTRACT: It is one of the key problems for the development of Chinese medicine to standardize the diagnosis of syndromes. The authors mainly discuss the ideas and methods of the study of standardization of syndrome diagnosis by retrospective analysis, also put forward the following suggestions: (1) the main ideas of this study should be based on the comparison of the diseases and their relevant syndromes and the predictive diagnosis of syndromes by the effects of herbal prescription treatment; (2) they are important ways to carry out multicenter, large sample and perspective clinical trials on the basis of the investigation and study of literature, consultation of experts and retrospective case review, and following the principles of clinical epidemiology, and to use the methods of evidencebased medicine to do systemic evaluation on the criteria of syndrome diagnosis; (3) they are important sectors of the study of standardization of syndrome diagnosis to enhance the objective studies on the four diagnostic methods of traditional Chinese medicine, and to do the functional studies under the conduction of systems biology; (4) Both data excavation technology and computer intelligence are the important technique supporting this study.
Analyses of time-dose-mortality model of the emulsifiable formulation of Metarhizium flavoviride Mf82 against Nilaparvata lugens

LIN Hua-Feng,ZHANG Song-Ying,LI Mao-Ye,LI Shi-Guang,FENG Ming-Feng,

菌物学报 , 2013,
Abstract: In order to effectively control Nilaparvata lugens, ten strains of entomogenous fungi including a new strain of Metarhizium flavoviride, Mf82, isolated from N. lugens and six strains of Beauveria bassiana and four different species of Metarhizium were bioassayed for its virulence against the adults of N. lugens. The results showed that cumulative mortality (81.7%) of strain Mf82 was the highest among all tested strains, and the median lethal time (LT50) value was 4.6d at a concentration of 1.0×108conidia/mL. Thus, an emulsifiable formulation of Mf82 was processed in the laboratory, and the bioassay of virulence of Mf82 against N. lugens was carried out. The results showed that the daily cumulative mortality of N.?lugens increased with the concentration of conidial suspension, and the highest concentration (1,048conidia/mm2) treatment caused 85.0% mortality. A time-dose-mortality model was used to analyze the bioassay data and the model fitted the data well, resulting in parameters for estimating the time and dose effects. The estimated LC50 values on day 7 and 9 post treatment were 2.1×103, 9.9×102conidia/mm2, respectively; while LC90 were 7.8×104, 3.7×104conidia/mm2, respectively. The LT50 of the emulsifiable formulation of M. flavoviride against the N. lugens differed at various logarithmic dose, and values of LT50 of tested agents were shortened with logarithmic dose. While logarithmic dose increased from 7.0 to 8.0, the LT50 values reduced from 8.9d to 5.7d. It is thus clear that the emulsifiable formulation of M. flavoviride has high virulence to N. lugens, and this new formulation could be used for biocontrol of N. lugens.
Antitumor Effects of Rapamycin in Pancreatic Cancer Cells by Inducing Apoptosis and Autophagy
Zhi-Jun Dai,Jie Gao,Xiao-Bin Ma,Hua-Feng Kang,Bao-Feng Wang,Wang-Feng Lu,Shuai Lin,Xi-Jing Wang,Wen-Ying Wu
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14010273
Abstract: Rapamycin (Rapa), an inhibitor of mammalian target of Rapamycin (mTOR), is an immunosuppressive agent that has anti-proliferative effects on some tumors. This study aims to investigate the effects of Rapa suppressing proliferation of pancreatic carcinoma PC-2 cells in vitro and its molecular mechanism involved in antitumor activities. MTT assays showed that the inhibition of proliferation of PC-2 cells in vitro was in a time- and dose-dependent manner. By using transmission electron microscopy, apoptosis bodies and formation of abundant autophagic vacuoles were observed in PC-2 cells after Rapa treatment. Flow cytometry assays also showed Rapa had a positive effect on apoptosis. MDC staining showed that the fluorescent density was higher and the number of MDC-labeled particles in PC-2 cells was greater in the Rapa treatment group than in the control group. RT-PCR revealed that the expression levels of p53, Bax and Beclin 1 were up-regulated in a dose-dependent manner, indicating that Beclin 1 was involved in Rapa induced autophagy and Rapa induced apoptosis as well as p53 up-regulation in PC-2 cells. The results demonstrated that Rapa could effectively inhibit proliferation and induce apoptosis and autophagy in PC-2 cells.
Phase Transition Exploitation of Condensate Gas ReservoirUsing Black Oil Model Method and Mass Balance Principle

ZHANG Jin-liang,LIU Jun,LI Lin-xin,LI Zhao-xia,TIAN Hua-feng,

天然气地球科学 , 2008,
Abstract: During the pressure-depleted exploitation of condensate gas reservoirs, PVT phase behavior transition will occur because of the changes of condensate gas composition, stratum porous media, temperature and pressure, especially the pressure decrease. According to these characteristics, this paper establishes a mathematical model that deals with the phase behavior transition exploitation of condensate gas reservoirs using the black oil model method and the mass balance principle. And it is used for the imitating and forecasting of the main parameters of an actual condensate gas reservoir, and all the parameters are close to the calculating results from the condensate gas reservoir exploitation and experiment. The aim is to avoid the appearance of retrograde condensed liquids under dew point pressure in formation near the wellbore bottom, and keep higher productivity, recovery ratio and production benefits for the condensate gas reservoir.
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