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3729篇 您的检索式:作者名="Hua Liu"
    题名 作者 年代 出处 被引量
1Function of apoptosis and expression of the proteins Bcl-2,p53 and C-myc in the development of gastric cancer显示文摘INTRODUCTIONIn China ,the incidence and mortality of gastric cancer rank the second among all cancers. Recent development of cancer [1-20].The aim of this study was investigat the insight of apoptosis and bcl-2, p53 and C-myc protein expression in the development of gastric cancer .An Gao Xu Shao Guang Li Ji Hong Liu Ai Hua Gan Research Laboratory of Digestive Disease,Huizhou Central People’s Hospital,Huizhou 516001,Guangdong Province,ChinaDr.An Gao Xu graduated from Guangdong Medical College in 1984.He is an associate physician-in-chief,specializing in the research and treatment of gastrointestinal and liver tumors.He has published 24 papers and 1 book. 2001World Journal of Gastroenterology2001,7,3:91
2Honeysuckle-encoded atypical microRNA2911 directly Largets influenza A viruses显示文摘Zhen Zhou Xihan Li Jinxiong Liu Lei Dong Qun Chen Jialing Liu Huihui Kongt Qianyi Zhang Xian Qi Dongxia Hou Lin Zhang Guoquan Zhang Yuchen Liu Yujing Zhang Jing Li Jin Wang Xi Chen Hua Wang Junfeng Zhang Hualan Chen Ke Zen Chen-Yu Zhang 2015Cell Research2015,25,1:104
3Animal experiment and clinical study of effect of gamma-interferon on hepatic fibrosis显示文摘AIM To evaluate the antifibrotic effect ofdifferent doses of recombinant human Gamma-Interferon (IFN-γ) intwo rat models of hepaticfibrosis, and to observe its effect on moderatechronic hepatitis B virus fibrosis.METNODS Hepatic fibrosis was successfullyinduced in 150 and 196 rats by subcutaneousinjection of carbon tetrachloride (CCl4) andintraperitoneal injection of dimethylnitrosamine(DMN), respectively. Each of the two modeldose IFN-γ group (15 MU/kg per day, i.m. for 8group (1.67 MU/kg daily, i.m. for 8 weeks).Another group of 10 rats without any treatmentwas used as normal controls. At the end of theexperiment, semi-quantitative histopathologicalscores of inflammation and fibrosis, liver (αsmooth muscle actin (α-SMA) expression level,liver hydroxyl proline content and serumhyaluronic acid levels were compared. And 47medium chronic hepatitis B viral fibrosispatients were studied. They were given IFN-γtreatment, 100MU/day i.m. for the first threemonths and 100MU qod i.m. for the next sixmonths. Semi-quantitative pathological scoresof inflammation and fibrosis and serum hepaticfibrosis indices were compared within the 9months.RESULTS In animal experiment, thepathological fibrosis scores and liver hydroxylproline content were found to be significantlylower in rats treated with different doses of IFN-γ as compared with rats in fibrotic model groupinduced by either CCI4 or DMN, in a dose-dependent manner. For CCI4-induced model,pathological fibrosis scores in high, medium andIow doses IFN-γ groups were 5.10 ± 2.88, 7.70 ±3.53 and 8.00 ± 3.30, respectively, but the scorewas 14.60 ± 7.82 in fibrotic model group.Hydroxyl proline contents were 2.83 ± 1.18, 3.59± 1.22 and 4.80 ± 1.62, in the three IFN-γgroups, and 10.01 ± 3.23 in fibrotic model group.The difference was statistically significant(P<0.01). Similar results were found in DMN-induced model. Pathological fibrosis scoreswere 6.30±0.48, 8.10 ±2.72 and 8.30 ±2.58, inhigh, medium and Iow doses IFN-γ groups, and12.60 ± 3.57 in fibrotic model group. Hydroxylproline contents were 2.72 ± 0.58, 3.14 ± 0.71and 3.62 ± 1.02, in the three IFN-γ groups, and12.79 ± 1.54 in fibrotic model group. Thedifference was statistically significant(P<0.01). Serum hepatic fibrosis indicesdecreased significantly in the 47 patients afterIFN-γ treatment (HA: 433.38 ± 373.00 vs 281.57± 220.48; LN: 161.22± 41.02 vs 146.35 ± 44.67;PCⅢ: 192.59 ± 89.95 vs 156.98 ± 49.22; C-Ⅳ:156.30 ± 44.01 vs 139.14 ± 34.47) and thedifferences between the four indices weresignificant (P<0.05). Thirty-three patientsCONCLUSION All the three doses of IFN-γ areeffective in treating rat liver fibrosis induced byeither CCl4 or DMN, the higher the dose, thebetter the effect. And IFN-γ is effective forpatients with moderate chronic hepatitis B viralfibrosis.Hong Lei Weng Wei Min Cai Rong Hua Liu Institute of Infectious Diseases, First Affiliated Hospital. Medical School. Zhejiang University, Hangzhou 310003, Zhejiang Province. China 2001World Journal of Gastroenterology2001,7,1:53
4Hydrogen Sulfide Promotes Root Organogenesis in Ipomoea batatas, Salix matsudana and Glycine max显示文摘In this report, we demonstrate that sodium hydrosulfide (NaHS), a hydrogen sulfide (H2S) donor, promoted adventitious root formation mediated by auxin and nitric oxide (NO). Application of the H2S donor to seedling cuttings of sweet potato (Ipomoea batatas L.) promoted the number and length of adventitious roots in a dose-dependent manner. It was also verified that H2S or HS- rather than other sulfur-containing components derived from NaHS could be attributed to the stimulation of adventitious root formation. A rapid increase in endogenous H2S, indole acetic acid (IAA) and NO were sequentially observed in shoot tips of sweet potato seedlings treated with HaHS. Further investigation showed that H2S-mediated root formation was alleviated by N-1-naphthylphthalamic acid (NPA), an IAA transport inhibitor, and 2-(4-carboxyphenyl)- 4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO), an NO scavenger. Similar phenomena in H2S donor-dependent root organogenesis were observed in both excised willow (Salix matsudana var. tortuosa Vilm) shoots and soybean (Glycine max L.) seedlings. These results indicated that the process of H2S-induced adventitious root formation was likely mediated by IAA and NO, and that H2S acts upstream of IAA and NO signal transduction pathways.Hua Zhang Jun Tang Xiao-Ping Liu Yun Wang Wei Yu Wei-Yan Peng Fang Fang Dai-Fu Ma Zhao-Jun Wei Lan-Ying Hu 2009Journal of Integrative Plant Biology2009,51,12:58
5Association factors of target organ damage: analysis of 17 682 elderly hypertensive patients in China显示文摘背景高血压的目标机关损坏(狐)在在亚洲的高血压的狐上的老高血压的 patients.The 研究是为死亡或残疾的主要原因,特别在中国老高血压的病人,很这研究的 limited.The 目的是在这是的更旧的中国高血压的 inpatients.Methods 评估狐的流行和关联词因素回顾的调查和数据从 19CUI Hua WANG Fan FAN Li HU Yi-xin HU Guo-liang LIU Lin HONG Chang-ming 2011Chinese Medical Journal2011,,22:60
6Moxibustion inhibits interleukin-12 and tumor necrosis factor alpha and modulates intestinal flora in rat with ulcerative colitis显示文摘AIM: To investigate the effect of moxibustion on intestinal flora and release of interleukin-12 (IL-12) and tumor necrosis factor-α (TNF-α) from the colon in rat with ulcerative colitis (UC). METHODS: A rat model of UC was established by local stimulation of the intestine with supernatant from colonic contents harvested from human UC patients. A total of 40 male Sprague-Dawley rats were randomly divided into the following groups: normal (sham), model (UC), herb-partition moxibustion (HPM-treated), and positive control sulfasalazine (SA-treated). Rats treated with HPM received HPM at acupuncture points ST25 and RN6, once a day for 15 min, for a total of 8 d. Rats in the SA group were perfused with SA twice a day for 8 d. The colonic histopathology was observed by hematoxylin-eosin. The levels of intestinal flora, including Bifidobacterium, Lactobacillus, Escherichia coli (E. coli), and Bacteroides fragilis (B. fragilis), were tested by real-time quantitative polymerase chain reaction to detect bacterial 16S rRNA/DNA in order to determine DNA copy numbers of each specific species. Immunohistochemical assays were used to observe the expression of TNF-α and IL-12 in the rat colons. RESULTS: HPM treatment inhibited immunopathology in colonic tissues of UC rats; the general morphological score and the immunopathological score were significantly decreased in the HPM and SA groups compared with the model group [3.5 (2.0-4.0), 3.0 (1.5-3.5) vs 6.0 (5.5-7.0), P < 0.05 for the general morphological score, and 3.00 (2.00-3.50), 3.00 (2.50-3.50) vs 5.00 (4.50-5.50), P < 0.01 for the immunopathological score]. As measured by DNA copy number, we found that Bifidobacterium and Lactobacillus, which are associated with a healthy colon, were significantly higher in the HPM and SA groups than in the model group (1.395 ± 1.339, 1.461 ± 1.152 vs 0.045 ± 0.036, P < 0.01 for Bifidobacterium, and 0.395 ± 0.325, 0.851 ± 0.651 vs 0.0015 ± 0.0014, P < 0.01 for Lactobacillus). On the other hand, E. coli and B. fragilis, which are associated with an inflamed colon, were significantly lower in the HPM and SA groups than in the model group (0.244 ± 0.107, 0.628 ± 0.257 vs 1.691 ± 0.683, P < 0.01 for E. coli, and 0.351 ± 0.181, 0.416 ± 0.329 vs 1.285 ± 1.039, P < 0.01 for B. fragilis). The expression of TNF-α and IL-12 was decreased after HPM and SA treatment as compared to UC model alone (4970.81 ± 959.78, 6635.45 ± 1135.16 vs 12333.81 ± 680.79, P < 0.01 for TNF-α, and 5528.75 ± 1245.72, 7477.38 ± 1259.16 vs 12550.29 ± 1973.30, P < 0.01 for IL-12). CONCLUSION: HPM treatment can regulate intestinal flora and inhibit the expression of TNF-α and IL-12 in the colon tissues of UC rats, indicating that HPM can improve colonic immune response.Xiao-Mei Wang Yuan Lu Lu-Yi Wu Shu-Guang Yu Bai-Xiao Zhao Hong-Yi Hu Huan-Gan Wu Chun-Hui Bao Hui-Rong Liu Jin-Hai Wang Yi Yao Xue-Gui Hua Hui-Ying Guo Li-Rong Shen 2012World Journal of Gastroenterology2012,18,46:57
7Pharmacological effects of Astragaloside IV: a literature review显示文摘OBJECTIVE: To review the pharmacological effects and mechanisms of action of Astragaloside IV in Huangqi (Radix Astragali Mongolici). METHODS: Aticles focusing on Astragaloside IV in English and Chinese in databases were collected and reviewed in order to summarize the latest extraction separation, pharmacokinetics, and the pharmacological effects of astrageloside IV. RESULTS: Protective effects of Astrageloside IV on the cardiovascular system, immune, digestive, nervous system were identified, and the action mechanisms were associated with regulation of the calcium balance, anti-oxydant, antiapoptosis, antivirus, and so on. CONCLUSION: Astrageloside IV has broad application prospects, especially in cardiovascular diseases, digestive diseases, cancer and other modern high incidence, high-risk diseases, and could be developed as a medicine.Shuang Ren Hua Zhang Yongping Mu Mingyu Sun Ping Liu 2013Journal of Traditional Chinese Medicine2013,33,3:57
82018 Chinese Pediatric Cardiology Society(CPCS) guideline for diagnosis and treatment of syncope in children and adolescents显示文摘Syncope belongs to the transient loss of consciousness(TLOC), characterized by a rapid onset, short duration, and spontaneous complete recovery. It is common in children and adolescents, accounting for 1% to 2% of emergency department visits.Recurrent syncope can seriously affect children's physical and mental health, learning ability and quality of life and sometimes cardiac syncope even poses a risk of sudden death. The present guideline for the diagnosis and treatment of syncope in children and adolescents was developed for guiding a better clinical management of pediatric syncope. Based on the globally recent development and the evidence-based data in China, 2018 Chinese Pediatric Cardiology Society(CPCS) guideline for diagnosis and treatment of syncope in children and adolescents was jointly prepared by the Pediatric Cardiology Society, Chinese Pediatric Society, Chinese Medical Association(CMA)/Committee on Pediatric Syncope, Pediatricians Branch, Chinese Medical Doctor Association(CMDA)/Committee on Pediatric Cardiology, Chinese College of Cardiovascular Physicians, Chinese Medical Doctor Association(CMDA)/Pediatric Cardiology Society, Beijing Pediatric Society, Beijing Medical Association(BMA). The present guideline includes the underlying diseases of syncope in children and adolescents, the diagnostic procedures, methodology and clinical significance of standing test and headup tilt test, the clinical diagnosis vasovagal syncope, postural orthostatic tachycardia syndrome, orthostatic hypotension and orthostatic hypertension, and the treatment of syncope as well as follow-up.Cheng Wang Yaqi Li Ying Liao Hong Tian Min Huang Xiangyu Dong Lin Shi Jinghui Sun Hongfang Jin Junbao Du Jindou An Jie Chen Mingwu Chen Qi Chen Sun Chen Yonghong Chen Zhi Chen Adolphus Kai-tung Chau Junbao Du Zhongdong Du Junkai Duan Hongyu Duan Xiangyu Dong Lin Feng Lijun Fu Fangqi Gong Yonghao Gui Ling Han Zhenhui Han Bing He Zhixu He Xiufen Hu Yimin Hua Guoying Huang Min Huang Ping Huang Yujuan Huang Hongfang Jin Mei Jin Bo Li Fen Li Tao Li Xiaohui Li Xiaoyan Liu Yan Li Haitao Lv Tiewei Lv Zipu Li Luyi Ma Silin Pan Yusheng Pang Hua Peng Yuming Qin Jie Shen Lin Shi Kun Sun Jinghui Sun Hong Tian Jie Tian Cheng Wang Hong Wang Lei Wang Jinju Wang Wendi Wang Yuli Wang Rongzhou Wu Tianhe Xia Yanyan Xiao Chunhong Xie Yanlin Xing Zhenyu Xiong Baoyuan Xu Yi Xu Hui Yan Shiwei Yang Qijian Yi Xia Yu Xianyi Yu Yue Yuan Hongyan Zhang Huili Zhang Li Zhang Qingyou Zhang Xi Zhang Yanmin Zhang Zhiwei Zhang Cuifen Zhao Bin Zhou Hua Zhu 2018Science Bulletin2018,63,23:54
9Comparing the Diagnostic Criteria for Gestational Diabetes Mellitus of World Health Organization 2013 with 1999 in Chinese Population显示文摘INTRODUCTION Gestational diabetes mellitus (GDM) was earlier defined as 'hyperglycemia first recognized during pregnancy' and has more recently been described by American Diabetes Association (ADA) (2012) as diabetes diagnosed during pregnancy that is not clearly overt diabetes.[1] The hyperglycemia and adverse pregnancy outcomes study (HAPO) demonstrated that the risk of adverse maternal,fetal,and neonatal outcomes continuously increase as a function of maternal glycemia at 24-28 weeks,even within ranges previously considered normal for pregnancy.[2] After reviewing the results of the HAPO study,many international diabetes study groups,including the International Association of Diabetes and Pregnancy Study Groups and ADA have adopted the 75 g oral glucose tolerance test (OGTT) at 24-28 weeks as a screening and diagnostic test and defined new cut-off values for GDM diagnosis.The Ministry of Health of China published the criteria for GDM,that is the same as the ADA criteria on July 1,2011.World Health Organization (WHO) has recommended the 75 g OGTT with different cut-offvalues as a diagnostic test since 1999,changed its recommendation on 2013.In Hongkong and Yunnan province in China,most hospital adopted the WHO 1999 criteria,nevertheless,there is no evidence of multicenter and large sample to show that the GDM population within the same ethnic group diagnosed by the new WHO criteria matches those diagnosed by the old one and consistency between the two criteria has not been reported.Thus,we conducted this study to analyze the two criteria in Chinese pregnant women.Weiwei Zhu Huixia Yang Yumei Wei Zilian Wang Xuelan Li Hairong Wu Nan Li Meihua Zhang Xinghui Liu Hua Zhang Yunhui Wang Jianmin Niu Yujie Gan Liruo Zhong Yunfeng Wang Anil Kapur 2015Chinese Medical Journal2015,,1:42
10Clinical and procedural predictors of no-ref low in patients with acute myocardial infarction after primary percutaneous coronary intervention显示文摘BACKGROUND: The treatment of acute myocardial infarction(AMI) is thought to restore antegrade blood flow in the infarct-related artery(IRA) and minimize ischemic damage to the myocardium as soon as possible. The present study aimed to identify possible clinical predictors for no-refl ow in patients with AMI after primary percutaneous coronary intervention(PCI).METHODS: A total of 312 consecutive patients with AMI who had been treated from January 2008 to December 2010 at the Cardiology Department of East Hospital, Tongji University School of Medicine were enrolled in this study. Inclusion criteria were:(i) patients underwent successfully primary PCI within 12 hours after the appearance of symptoms; or(ii) patients with ischemic chest pain for more than 12 hours after a successful primary PCI within 24 hours after appearance of symptoms. Exculsion criteria were:(i) coronary artery spasm;(ii) diameter stenosis of the culprit lesion was ≤50% and coronary blood f low was normal;(iii) patients with severe left main coronary or multivessel disease, who had to require emergency revascularization. According to thrombolysis in myocardial infarction(TIMI), the patients were divided into a reflow group and a no-reflow group. The clinical data, angiography f indings and surgical data were compared between the two groups. Univariate and multivariate logistic regressions were used to determine the predictors for no-ref low.RESULTS: Fifty-four(17.3%) of the patients developed NR phenomenon after primary PCI. Univariate analysis showed that age, time from onset to reperfusion, systolic blood pressure(SBP) on admission, Killip class of myocardial infarction, intra-aortic balloon pump(IABP) use before primary PCI, TIMI flow grade before primary PCI, type of occlusion, thrombus burden on baseline angiography, target lesion length, reference luminal diameter and method of reperfusion were correlated with no-reflow(P<0.05 for all). Multiple logistic regression analysis identified that age >65 years [OR=1.470, 95% confi dence interval(CI) 1.460–1.490, P=0.007], long time from onset to reperfusion >6 hours(OR=1.270, 95%CI 1.160–1.400, P=0.001), low SBP on admission <100 mmHg(OR=1.910, 95%CI 1.018–3.896, P=0.004), IABP use before PCI(OR= 1.949, 95%CI 1.168–3.253, P=0.011), low(≤1) TIMI fl ow grade before primary PCI(OR=1.100, 95%CI 1.080–1.250, P<0.001), high thrombus burden(OR=1.600, 95%CI 1.470–2.760, P=0.030), and long target lesion(OR=1.948, 95%CI 1.908–1.990, P=0.019) on angiography were independent predictors of no-refl ow.CONCLUSION: The occurrence of no-refl ow after primary PCI for acute myocardial infarction can predict clinical, angiographic and procedural features.Hua Zhou Xiao-yan He Shao-wei Zhuang Juan Wang Yan Lai Wei-gang Qi Yi-an Yao Xue-bo Liu 2014World Journal of Emergency Medicine2014,5,2:46
11Programmable time-domain digital-coding metasurface for non-linear harmonic manipulation and new wireless communication systems显示文摘Optical non-linear phenomena are typically observed in natural materials interacting with light at high intensities, and they benefit a diverse range of applications from communication to sensing. However,controlling harmonic conversion with high efficiency and flexibility remains a major issue in modern optical and radio-frequency systems. Here, we introduce a dynamic time-domain digital-coding metasurface that enables efficient manipulation of spectral harmonic distribution. By dynamically modulating the local phase of the surface reflectivity, we achieve accurate control of different harmonics in a highly programmable and dynamic fashion, enabling unusual responses, such as velocity illusion. As a relevant application, we propose and realize a novel architecture for wireless communication systems based on the time-domain digital-coding metasurface, which largely simplifies the architecture of modern communication systems, at the same time yielding excellent performance for real-time signal transmission. The presented work, from new concept to new system, opens new pathways in the application of metamaterials to practical technology.Jie Zhao Xi Yang Jun Yan Dai Qiang Cheng Xiang Li Ning Hua Qi Jun Chen Ke Guo Dong Bai Shuo Liu Shi Jin Andrea Alù Tie Jun Cui 2019National Science Review2019,6,2:46
12Innate immunity in tuberculosis: host defense vs pathogen evasion显示文摘The major innate immune cell types involved in tuberculosis(TB)infection are macrophages,dendritic cells(DCs),neutrophils and natural killer(NK)cells.These immune cells recognize the TB-causing pathogen Mycobacterium tuberculosis(Mtb)through various pattern recognition receptors(PRRs),including but not limited to Toll-like receptors(TLRs),Nod-like receptors(NLRs)and C-type lectin receptors(CLRs).Upon infection by Mtb,the host orchestrates multiple signaling cascades via the PRRs to launch a variety of innate immune defense functions such as phagocytosis,autophagy,apoptosis and inflammasome activation.In contrast,Mtb utilizes numerous exquisite strategies to evade or circumvent host innate immunity.Here we discuss recent research on major host innate immune cells,PRR signaling,and the cellular functions involved in Mtb infection,with a specific focus on the host’s innate immune defense and Mtb immune evasion.A better understanding of the molecular mechanisms underlying host–pathogen interactions could provide a rational basis for the development of effective anti-TB therapeutics.Cui Hua Liu Haiying Liu Baoxue Ge 2017Cellular & Molecular Immunology2017,14,12:43
13Regulation of the cell cycle gene, BTG2, by miR-21 in human laryngeal carcinoma显示文摘MicroRNAs 是否定地在 post-transcriptional 水平调制基因表示的短规章的 RNA,并且深深地涉及癌症的几种类型的致病。调查特定的 miRNAs 和他们的目标基因是否参予喉的癌的分子的致病, oligonucleotide microarrays 被用来与正常纸巾相比在喉的癌纸巾估计 microRNAs 和 mRNAs 的微分表示侧面。oncogenic miRNA, microRNA-21 (miR-21 ) ,被发现是在喉的癌纸巾的 upregulated。由特定的 antisense oligonucleotides 的 miR-21 击倒而 miR-21 的 overexpression 提高了细胞的生长活动,由殖民地形成试金检测了,禁止了 HEp-2 细胞的增长潜力。miR-21 抑制引起的房间数字减小由于 G1-S 阶段转变的控制的损失,而不是 apoptosis 的显著增加。随后, miR-21 的新目标基因, BTG2,被发现是在喉的癌纸巾的 downregulated。BTG2 被知道充当一个平底锅房间周期管理者和肿瘤 suppressor。这些调查结果显示 miR-21 的那异常表情可以由维持 BTG2 的底层贡献喉的癌的恶意的显型。oncogenic miR-21 和它的目标基因的鉴定, BTG2,为癌症诊断和治疗在喉的癌是潜在地珍贵的。Min Liu Haidong Wu Tao Liu Yixuan Li Fang Wang Haiying Wan Xin Li Hua Tang 2009Cell Research2009,19,7:40
14Pachytene piRNAs instruct massive mRNA elimination during late spermiogenesis显示文摘在哺乳动物的精子发生被 piRNA 表示的二个波浪描绘:一个人对应于负责的经典 piRNAs 因为 silencing retrotransponsons 和第二个波浪主要在 pachytene spermatocytes 从 nontransposon intergenic 区域被导出,但是这些 pachytene piRNAs 的功能大部分是未知的。这里,我们在在老鼠伸长指示巨大的 mRNA 消除报导 pachytene piRNAs 的参与 spermatids (ES ) 。我们证明包含鼠科的 PIWI (MIWI ) 和 deadenylase CAF1 的导致 piRNA 的 silencing 建筑群(pi-RISC ) 有选择地在 ES 被装配,它负责经由在体的房间类似于 miRNAs 的行动的机制导致 mRNA deadenylation 和腐烂。如此的一个高度安排的节目看起来充分利用 pachytene piRNAs 的能力从 nontransposon intergenic 区域导出的多样化的指向的庞大的全部剧目。这些调查结果建议 pachytene piRNAs 负责为精子生产作准备,从 ES 使广阔细胞的节目失去活性。Lan-Tao Gou Peng Dai Jian-Hua Yang Yuanchao Xue Yun-Ping Hu Yu Zhou Jun-Yan Kang Xin Wang Hairi Li Min-Min Hua Shuang Zhao Si-Da Hu Li-Gang Wu Hui-Juan Shi Yong Li Xiang-Dong Fu Liang-Hu Qu En-Duo Wang Mo-Fang Liu 2014Cell Research2014,24,6:39
15Scientific design and preliminary results of three-dimensional variational data assimilation system of GRAPES显示文摘The scientific design and preliminary results of the data assimilation component of the Global-Regional Prediction and Assimilation System (GRAPES) recently developed in China Meteorological Administration (CMA) are presented in this paper. This is a three-dimensional variational (3DVar) assimilation system set up on global and regional grid meshes favorable for direct assimilation of the space-based remote sensing data and matching the frame work of the prediction model GRAPES. The state variables are assumed to decompose balanced and unbalanced components. By introducing a simple transformation from the state variables to the control variables with a recursive or spectral filter, the convergence rate of iteration for minimization of the cost function in 3DVar is greatly accelerated. The definition of dynamical balance depends on the characteristic scale of the circulation considered. The ratio of the balanced to the unbalanced parts is controlled by the prescribed statistics of background errors. Idealized trials produce the same results as the analytic solution. The results of real data case studies show the capability of the system to improve analysis compared to the traditional schemes. Finally, further development of the system is discussed.XUE JiShan ZHUANG ShiYu ZHU GuoFu ZHANG Hua LIU ZhiQuan LIU Yan ZHUANG ZhaoRong 2008Chinese Science Bulletin2008,53,22:33
16The Wolf Colony Algorithm and Its Application显示文摘LIU Changan YAN Xiaohu LIU Chunyang WU Hua 2011Chinese Journal of Electronics2011,20,2:34
17Environmental connections of novel avian-origin H7N9 influenza virus infection and virus adaptation to the human显示文摘A novel H7N9 influenza A virus has been discovered as the causative identity of the emerging acute respiratory infection cases in Shanghai,China.This virus has also been identified in cases of infection in the neighboring area Hangzhou City in Zhejiang Province.In this study,epidemiologic,clinical,and virological data from three patients in Hangzhou who were confirmed to be infected by the novel H7N9 influenza A virus were collected and analyzed.Human respiratory specimens and chicken feces from a contacted free market were tested for influenza virus by real-time reverse transcription PCR(RT-PCR) and sequencing.The clinical features of the three cases were similar featured with high fever and severe respiratory symptoms;however,only one of the patients died.A certain degree of diversity was observed among the three Hangzhou viruses sequenced from human samples compared with other reported H7N9 influenza A viruses.The sequences of the novel avian-origin H7N9 influenza viruses from Hangzhou City contained important amino acid substitutions related to human adaptation.One of the Hangzhou viruses had gained a novel amino acid substitution(Q226I) in the receptor binding region of hemagglutinin.More importantly,the virus sequenced from the chicken feces had a 627E substitution in the PB2 protein instead of the mammalian-adapted 627K substitution that was found in the PB2 proteins from the Hangzhou viruses from the three patients.Therefore,the newly-emerging H7N9 virus might be under adaptation pressure that will help it 'jump' from avian to human hosts.The significance of these substitutions needs further exploration,with both laboratory experiments and extensive field surveillance.LI Jun YU XinFen PU XiaoYing XIE Li SUN YongXiang XIAO HaiXia WANG FenJuan DIN Hua WU Ying LIU Di ZHAO GuoQiu LIU Jun PAN JingCao 2013Science China(Life Sciences)2013,56,6:32
18Preliminary results pertaining to coseismic displacement and preseismic strain accumulation of the Lushan M_S7.0 earthquake,as reflected by GPS surveying显示文摘This paper presents the coseismic displacement and preseismic deformation fields of the Lushan MS7.0 earthquake that occurred on April 20,2013.The results are based on GPS observations along the Longmenshan fault and within its vicinity.The coseismic displacement and preseismic GPS results indicate that in the strain release of this earthquake,the thrust rupture is dominant and the laevorotation movement is secondary.Furthermore,we infer that any possible the rupture does not reach the earth’s surface,and the seismogenic fault is most likely one fault to the east of the Guanxian-Anxian fault.Some detailed results are obtainable.(1)The southern segment of the Longmenshan fault is locked preceding the Lushan earthquake.After the Wenchuan earthquake,the strain accumulation rate in the southeast direction accelerates in the epicenter of the Lushan earthquake,and the angle between the principal compressional strain and the seismogenic fault indicates that a sinistral deformation background in the direction of the seismogenic fault precedes the Lushan earthquake.Therefore,it is evident that the Wenchuan MS8.0 earthquake accelerated the pregnancy of the Lushan earthquake.(2)The coseismic displacements reflected by GPS data are mainly located in a region that is 230 km(NW direction)×100 km(SW direction),and coseismic displacements larger than 10 mm lie predominantly in a100-km region(NW direction).(3)On a large scale,the coseismic displacement shows thrust characteristics,but the associated values are remarkably small in the near field(within 70 km)of the earthquake fault.Meanwhile,the thrust movement in this70-km region does not correspond with the attenuation characteristics of the strain release,indicating that the rupture of this earthquake does not reach the earth’s surface.(4)The laevorotation movements are remarkable in the 50-km region,which is located in the hanging wall that is close to the earthquake fault,and the corresponding values in this case correlate with the attenuation characteristics of the strain release.WU YanQiang JIANG ZaiSen WANG Min CHE Shi LIAO Hua LI Qiang LI Peng YANG YongLin XIANG HePing SHAO ZhiGang WANG WuXing WEI WenXin LIU XiaoXia 2013Chinese Science Bulletin2013,58,28:33
19Gastrodin Attenuates Pentylenetetrazole-Induced Seizures by Modulating the Mitogen-Activated Protein Kinase-Associated Inflammatory Responses in Mice显示文摘Gastrodin, the major component isolated from the rhizome of the Chinese traditional medicinal herb Gastrodia elata(‘‘Tianma''), has a long history in the treatment of epilepsy and other neurological disorders.However, the molecular mechanisms are not clear. Here,we found that gastrodin ameliorated pentylenetetrazole(PTZ)-induced epileptic seizures with improvement of the electroencephalographic pattern in mice. Further studies demonstrated that gastrodin decreased the levels of the pro-inflammatory cytokines interleukin-1b and tumor necrosis factor-a while increasing interleukin-10, an antiinflammatory cytokine in the brain. Furthermore, gastrodin attenuated the PTZ-induced microglial activation along with inhibition of mitogen-activated protein kinases,c AMP response element binding protein, and NF-j B. Our data suggest that gastrodin attenuates seizures by modulating the mitogen-activated protein kinase-associated inflammatory responses.Liming Chen Xinan Liu Hua Wang Min Qu 2017Neuroscience Bulletin2017,33,3:31
20WATER ENTRY OF A WEDGE BASED ON SPH MODEL WITH AN IMPROVED BOUNDARY TREATMENT显示文摘The hydrodynamic problem of a two-dimensional wedge entering water is studied based on Smoothed Particle Hydrodynamics (SPH) model. A non-reflection boundary treatment for SPH method is proposed to reduce the reflection of sound waves. The boundary pressure is obtained using an improved coupling boundary treatment approach, which is validated by comparing the simulation results with experimental and analytical results in literature. A series of cases with different initial entering velocities are simulated. The maximum force on the wedge and the corresponding time required to reach it for the different cases of initial entering velocities of the wedge are obained and fitted into formulas against the initial entering velocity of the wedge. The maximum drag coefficients of the wedge for the different cases with Froude number greater than 2 are all near the value of 0.91.GONG Kai LIU Hua WANG Ben-long 2009Journal of Hydrodynamics2009,21,6:29
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