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257篇 您的检索式:作者名="Zhang MD"
    题名 作者 年代 出处 被引量
1Methylation status of p16 gene in colorectal carcinoma and normal colonic mucosa显示文摘Zhang J Lai MD Chen J 1999World Journal of Gastroenterology1999,5,5:15
2Drug resistance mechanisms and novel drug targets for tuberculosis therapy显示文摘Drug-resistant tuberculosis(TB) poses a significant challenge to the successful treatment and control of TB worldwide.Resistance to anti-TB drugs has existed since the beginning of the chemotherapy era.New insights into the resistant mechanisms of anti-TB drugs have been provided.Better understanding of drug resistance mechanisms helps in the development of new tools for the rapid diagnosis of drugresistant TB.There is also a pressing need in the development of new drugs with novel targets to improve the current treatment of TB and to prevent the emergence of drug resistance in Mycobacterium tuberculosis.This review summarizes the anti-TB drug resistance mechanisms,furnishes some possible novel drug targets in the development of new agents for TB therapy and discusses the usefulness using known targets to develop new anti-TB drugs.Whole genome sequencing is currently an advanced technology to uncover drug resistance mechanisms in M.tuberculosis.However,further research is required to unravel the significance of some newly discovered gene mutations in their contribution to drug resistance.Md Mahmudul Islam H.M. Adnan Hameed Julius Mugweru Chiranjibi Chhotaray Changwei Wang Yaoju Tan Jianxiong Liu Xinjie Li Shouyong Tan Iwao Ojima Wing Wai Yew Eric Nuermberger Gyanu Lamichhane Tianyu Zhang 2017Journal of Genetics and Genomics2017,44,1:15
3Organic amendments increase corn yield by enhancing soil resilience to climate change显示文摘A 22-year field experiment was conducted in Gongzhuling, Jilin province, China to investigate corn yield response to fertilization practice. Compared to an unfertilized control(CK), all fertilization treatments, including inorganic nitrogen fertilizer only(N), balanced inorganic fertilizers(NPK), NPK plus corn straw(SNPK), and NPK plus farmyard manure(MNPK), resulted in significant increases in corn yield. However, only organic matter amendments sustained increasing yield trends, with annual rates of 0.137 and 0.194 t ha-1for the SPNK and MNPK treatments, respectively(P < 0.05). During the 22 years, the daily mean, maximum and minimum temperatures increased by 0.50, 0.53, and 0.46 °C per decade, whereas precipitation displayed no significant change but showed large seasonal variation. According to a regression analysis, increased air temperature exerted positive effects on corn yields under the SNPK and the MNPK treatments. Under both treatments,soil organic carbon contents and soil nutrient availabilities increased significantly compared to their initial levels in 1990, whereas soil bulk density and total porosity changed slightly under the two treatments, which showed higher soil water storage than other treatments. In contrast, significant increases in soil bulk density and decreases in soil total porosity and soil nutrient availability were observed under the CK, N and NPK treatments. The contributions of soil fertility to corn yield were 28.4%, 37.9%, 38.4%, 39.0%,and 42.9% under CK, N, NPK, SNPK, and MNPK treatments, respectively, whereas climate changes accounted for 27.0%, 14.6%, 12.4%, 11.8%, and 10.8%. These results indicate that, in Northeast China, organic matter amendments can mitigate negative and exploit positive effects of climate change on crop production by enhancing soil quality.Zhenwei Song Hongjun Gao Ping Zhu Chang Peng Aixing Deng Chengyan Zheng Md Abdul Mannaf Md Nurul Islam Weijian Zhang 2015The Crop Journal2015,3,2:8
4Tissue and host tropism of influenza viruses:Importance of quantitative analysis显示文摘It is generally accepted that human influenza viruses preferentially bind to cell-surface glycoproteins/ glycolipids containing sialic acids in α2,6-linkage; while avian and equine influenza viruses preferentially bind to those containing sialic acids in α2,3-linkage. Even though this generalized view is accurate for H3 subtype isolates, it may not be accurate and absolute for all subtypes of influenza A viruses and, therefore, needs to be reevaluated carefully and realistically. Some of the studies published in major scientific journals on the subject of tissue tropism of influenza viruses are inconsistent and caused confusion in the scientific community. One of the reasons for the inconsistency is that most studies were quantitative descriptions of sialic acid receptor distributions based on lectin or influenza virus immunohistochemistry results with limited numbers of stained cells. In addition, recent studies indicate that α2,3- and α2,6-linked sialic acids are not the sole receptors determining tissue and host tropism of influenza viruses. In fact, determinants for tissue and host tropism of human, avian and animal influenza viruses are more complex than what has been generally accepted. Other factors, such as glycan topology, concentration of invading viruses, local density of receptors, lipid raft microdomains, coreceptors or sialic acid-independent receptors, may also be important. To more efficiently control the global spread of pandemic influenza such as the current circulating influenza A H1N1, it is crucial to clarify the determinants for tissue and host tropism of influenza viruses through quantitative analysis of experimental results. In this review, I will comment on some conflicting issues related to tissue and host tropism of influenza viruses, discuss the importance of quantitative analysis of lectin and influenza virus immunohistochemistry results and point out directions for future studies in this area, which should lead to a better understanding of tissue and host tropism of influenza viruses.ZHANG Hong1,2 1 Z-BioMed, Inc., Rockville, MD 20855, USA 2 Department of Respiratory Medicine, Affiliated Hospital of Zunyi Medical College, Zunyi 563003, China 2009Science China(Life Sciences)2009,52,12:7
5Sedimentary and geochemical evidence of Eocene climate change in the Xining Basin, northeastern Tibetan Plateau显示文摘The northeastern Tibetan Plateau began to grow during the Eocene and it is important to understand the climatic history of Asia during this period of so-called ‘doubthouse' conditions. However, despite major advances in the last few decades,the evolutionary history and possible mechanisms of Eocene climate change in the northeastern Tibetan Plateau remain unclear.The Xining Basin in the northeastern Tibetan Plateau contains a continuous sequence of Early to Late Eocene non-marine sediments which provides the opportunity to resolve long-term climate changes during this period. In this study, we report the results of analyses of lithofacies, sediment color and geochemistry of bulk samples collected from the Xijigou section of the Xining Basin. An abrupt lithofacies change between the Early(~52–40 Ma) and Late Eocene(~40–34 Ma) indicates a change in the depositional environment from a shallow lake to a playa lake in response to a significant climatic shift. During ~52–40 Ma,higher values of sediment redness(a*), redness/lightness(a*/L*) and higher modified Chemical Index of Weathering(CIW′)indicate a relatively warm and humid climate, while from ~40–34 Ma the lower values of a*, a*/L*and lower CIW′ imply subhumid to semi-arid climatic conditions. The paleoclimatic records indicate a long-term(~52–34 Ma) trend of decreasing chemical weathering, consistent with global climate change. An abrupt sharp excursion of the proxy records during ~42–40 Ma suggests a relatively brief warm interval, corresponding to the Middle Eocene Climatic Optimum(MECO). We suggest that global cooling substantially reduced humidity in inner Asia, resulting in sub-humid to semi-arid climatic conditions after 40 Ma in the Xining Basin, which may have been responsible for the long-term trend of decreasing chemical weathering during the Eocene.Abu Sadat Md SAYEM Zhengtang GUO Haibin WU Chunxia ZHANG Fan YANG Guoqiao XIAO Zhilin HE 2018Science China Earth Sciences2018,61,9:6
6Self-centering seismic retrofit scheme for reinforced concrete frame structures:SDOF system study显示文摘This paper presents the results of a parametric study of self-centering seismic retrofit schemes for reinforced concrete (RC) frame buildings. The self-centering retrofit system features flag-shaped hysteresis and minimal residual deformation. For comparison purpose,an alternate seismic retrofit scheme that uses a bilinear-hysteresis retrofit system such as buckling-restrained braces (BRB) is also considered in this paper. The parametric study was carried out in a single-degree-of-freedom (SDOF) system framework since a multi-story building structure may be idealized as an equivalent SDOF system and investigation of the performance of this equivalent SDOF system can provide insight into the seismic response of the multi-story building. A peak-oriented hysteresis model which can consider the strength and stiffness degradation is used to describe the hysteretic behavior of RC structures. The parametric study involves two key parameters -the strength ratio and elastic stiffness ratio between the seismic retrofit system and the original RC frame. An ensemble of 172 earthquake ground motion records scaled to the design basis earthquake in California with a probability of exceedance of 10% in 50 years was constructed for the simulation-based parametric study. The effectiveness of the two seismic retrofit schemes considered in this study is evaluated in terms of peak displacement ratio,peak acceleration ratio,energy dissipation demand ratio and residual displacement ratio between the SDOF systems with and without retrofit. It is found from this parametric study that RC structures retrofitted with the self-centering retrofit scheme (SCRS) can achieve a seismic performance level comparable to the bilinear-hysteresis retrofit scheme (BHRS) in terms of peak displacement and energy dissipation demand ratio while having negligible residual displacement after earthquake.Yunfeng Zhang and Xiaobin Hu Department of Civil and Environmental Engineering,University of Maryland,College Park,MD 20742,USA 2010Earthquake Engineering and Engineering Vibration2010,9,2:4
7Flexibility Prediction of Aggregated Electric Vehicles and Domestic Hot Water Systems in Smart Grids显示文摘With the growth of intermittent renewable energy generation in power grids,there is an increasing demand for controllable resources to be deployed to guarantee power quality and frequency stability.The flexibility of demand response(DR)resources has become a valuable solution to this problem.However,existing research indicates that problems on flexibility prediction of DR resources have not been investigated.This study applied the temporal convolution network(TCN)-combined transformer,a deep learning technique to predict the aggregated flexibility of two types of DR resources,that is,electric vehicles(EVs)and domestic hot water system(DHWS).The prediction uses historical power consumption data of these DR resources and DR signals(DSs)to facilitate prediction.The prediction can generate the size and maintenance time of the aggregated flexibility.The accuracy of the flexibility prediction results was verified through simulations of case studies.The simulation results show that under different maintenance times,the size of the flexibility changed.The proposed DR resource flexibility prediction method demonstrates its application in unlocking the demand-side flexibility to provide a reserve to grids.Junjie Hu Huayanran Zhou Yihong Zhou Haijing Zhang Lars Nordströmd Guangya Yang 2021Engineering2021,7,8:3
8Differences between soybean genotypes in physiological response to sequential soil drying and rewetting显示文摘Soybean genotypes show diverse physiological responses to drought, but specific physiological traits that can be used to evaluate drought tolerance have not been identified. In the present study we investigated physiological traits of soybean genotypes under progressive soil drying and rewetting, using a treatment mimicking field conditions.After a preliminary study with eight soybean genotypes, two drought-tolerant genotypes and one susceptible genotype were grown in the greenhouse and subjected to water restriction. Leaf expansion rate, gas exchange, water relation parameters, total chlorophyll(Chl), proline contents of leaves, and root xylem p H were monitored in a time course, and plant growth and root traits were measured at the end of the stress cycle. Drought-tolerant genotypes maintained higher leaf expansion rate, net photosynthetic rate(Pn), Chl content,instantaneous water use efficiency(WUEi), % relative water content(RWC), water potential(ψw), and turgor potential(ψp) during progressive soil drying and subsequent rewetting than the susceptible genotypes. By contrast, stomatal conductance(gs) and transpiration rate(Tr)of tolerant genotypes declined faster owing to dehydration and recovered more sharply after rehydration than the same parameters in susceptible ones. Water stress caused a significant increase in leaf proline level and root xylem sap p H of both genotypes but tolerant genotypes recovered to pre-stress levels more quickly after rehydration. Tolerant genotypes also produced longer roots with higher dry mass than susceptible genotypes. We conclude that rapid perception and adjustment in response to soil drying and rewetting as well as the maintenance of relatively high Pn, %RWC, and root growth constitute the mechanisms by which drought-tolerant soybean genotypes cope with water stress.Md Mokter Hossain Xueyi Liu Xusheng Qi Hon-Ming Lam Jianhua Zhang 2014The Crop Journal2014,2,6:2
9鞘内注射吗啡预处理激活大鼠δ、κ、μ受体致心肌保护显示文摘背景鞘内注射小剂量吗啡可产生与静脉注射吗啡相似的心肌保护作用,但鞘内注射吗啡预处理(IT—MPC)与缺血预处理(IPC)作用强度的差别还未知,IT-MPC是否由阿片类受体所介导也未阐明。因此,本实验比较IT—MPC与IPC作用强度差别并探讨阿片类受体的作用。方法80只SD大鼠麻醉后开胸,成功置入鞘内导管后随机分为13组(n=6—7)。IPC组接受3次5分钟缺血-5分钟再灌注的心肌IPC(阻闭左冠状动脉),随之给予30分钟缺血-2小时再灌注诱导心肌缺血再灌注(IR)损伤。IT-MPC组按剂量不同分为4个亚组(分别是0.03、0.3、3及30μg/kg),以3次5分钟注射-5分钟间停的模式平均注入鞘内,随之诱导IR损伤。静脉注射吗啡预处理组(IV-MPC)组经静脉给予吗啡300μg/kg,对照组鞘内给予10μl生理盐水。受体阻滞剂组选择在IT—MPC(3μg/kg)前分别给予选择性δ、κ、μ受体阻滞剂NTD、nor-BNI及CTOP,以评价阿片类受体亚型的作用。通过2,3,5-tripheny ltetrazolium染色,计算心肌梗死面积(IS),即梗死心肌占缺血危险区(AAR)的百分比。结果与对照组相比,鞘内注射0.3~30μg/kg吗啡降低心肌IS,3组IS/AAR分别为33%±10%(0.3μg/kg)、29%±10%(3μg/kg)、29%±16%(30μg/kg),对照组为53%±8%(P〈0.01)。IT-MPC降低心肌IS/AAR程度与IV-MPC(33%±6%,P=0.84)及IPC(22%±4%,P=0.41)相近。注射选择性受体阻滞剂后,由IT-MPC(3μg/kg)产生的心肌预处理效果降低(NTD+IT-MPC,50%±9%:nor-BNI+IT-MPc,43%±6%;CTOP+IT—MPC,53%±9%;与对照组相比,P=0.14)。结论IT—MPC产生与IPC及IV—MPC相近的心肌保护作用,其机制涉及到δ、κ、μ受体。Rui Li Gordon T. C. Wong Tak Ming Wong Ye Zhang, MD Zhengyuan Xia Michael G. Irwin 潘鹏(译) 李文志(校) 2009麻醉与镇痛2009,,6:2
10Effects of Location and Extension of Portal Vein Tumor Thrombus on Long-Term Outcomes of Surgical Treatment for Hepatocellular Carcinoma显示文摘Xiao-Ping Chen MD PhD FACS Fa-Zu Qiu MD PhD Zai-De Wu MD PhD Zhi-Wei Zhang MD PhD Zhi-Yong Huang MD PhD Yi-Fa Chen MD PhD Bi-Xiang Zhang MD PhD Song-Qing He MD PhD Wan-Guang Zhang MD PhD 2006Annals of Surgical Oncology2006,,7:2
11The α_Mβ_2 integrin and its role in neutrophil function显示文摘Neutrophils are the first cell type to arrive at the in-jury sites and play a critical role in host defense, by virtueof its ability to adhere and transmigrate through endothe-lium, to phagocytose foreign pathogens, and to producefree oxygen radicals and proteolytic enzymes. Yet, inap-propriate neutrophil activation causes tissue damage andvarious inflammatory diseases. These physiological andpathological functions of neutrophils depend on the en-gagement of certain surface receptors, especially αMβ2,the ma jor β2 integrin receptor present on neutrophil sur-face. Understanding of the molecular mechanisms under-lying ligand binding by αMβ2, as well as the roles of αMβ2-ligand interactions in neutrophil functions will enable usto regulate more precisely neutrophil activities: that is,to promote their host defense functions, and at the sametime to minimize their deleterious effects on normal cells.ZHANG LI (Department of Vascular Biology, American Red Cross,Holland La6oratory, 15601 Crabbs Branch Way, Rockville,MD 20855 USA)Tel: 301-738-0657 Fax: 301-738-0465e-mail: zhangl@u8a.redcross. org 1999Cell Research1999,9,3:2
12Advances in the development of molecular genetic tools for Mycobacterium tuberculosis显示文摘Mycobacterium tuberculosis, a Gram-positive bacterium of great clinical relevance, is a lethal pathogen owing to its complex physiological characteristics and development of drug resistance. Several molecular genetic tools have been developed in the past few decades to study this microorganism. These tools have been instrumental in understanding how M. tuberculosis became a successful pathogen. Advanced molecular genetic tools have played a significant role in exploring the complex pathways involved in M. tuberculosis pathogenesis. Here, we review various molecular genetic tools used in the study of M. tuberculosis. Further, we discuss the applications of clustered regularly interspaced short palindromic repeat interference(CRISPRi), a novel technology recently applied in M. tuberculosis research to study target gene functions. Finally, prospective outcomes of the applications of molecular techniques in the field of M. tuberculosis genetic research are also discussed.Chiranjibi Chhotaray Yaoju Tan Julius Mugweru Md Mahmudul Islam H.M.Adnan Hameed Shuai Wang Zhili Lu Changwei Wang Xinjie Li Shouyong Tan Jianxiong Liu Tianyu Zhang 2018Journal of Genetics and Genomics2018,45,6:2
13Outsmarting cancer:an international brainstorm in Guangzhou显示文摘Cancer is the most deadly disease in the United States.In developing countries such as China, cancer is increasingly prevalent as a cause of death.The “war against cancer” that was initially declared in the United States has become a global war that requires an alliance of world-wide cancer researchers.As part of such an effort, the Second Guangzhou International Symposium on Oncology was held on May 20-22, 2011, in Guangzhou, China.Chao-Nan Qian 1,2 and Wei Zhang 31 Laboratory of Cancer and Developmental Cell Biology,Van Andel Research Institute,Grand Rapids,MI 49503,USA 2 State Key Laboratory of Oncology in South China,Sun Yat-sen University Cancer Center,Guangzhou,Guangdong 510060,P.R.China 3 Department of Pathology,University of Texas MD Anderson Cancer Center,Huston,TX 77030,USA. 2011Chinese Journal of Cancer2011,30,8:2
14Differentiation and Pro-Angiogenic Potential of Infantile Hemangioma Stem Cells显示文摘Objectives Infantile hemangioma(IH)is defined as a benign vascular tumor composed of immature vascular endothelial cells,with the unique characteristics of rich vascularization and self-regression into fibro-fatty tissue.CD133-positive hemangioma stem cells(HemSCs),present in the proliferating IH tissue,can be used to establish the IH animal model,which has highlighted the pathogenesis of IH in recent years.This study focused on the biological characteristics and differentiation capacity of HemSCs and aimed to provide a theoretical possibility for its application in tissue engineering.Methods To further confirm our hypothesis,we used fluorescence-activated cell sorting(FACS),in vitro multipotent induced differentiation,angiogenesis assay,and antibody array to identify the surface markers,multipotent differential potential,angiogenesis potential,and secreted factors of HemSCs,respectively,utilizing human adipose stem cells(hADSCs)as the control.Results We successfully isolated and cultured HemSCs.FACS indicated that,on average,more than 80%of HemSCs matched the criteria of mesenchymal stem cell(MSC)surface markers.Our results confirmed that HemSCs could differentiate into adipocytes,osteocytes,and chondrocytes.Additionally,compared with fibroblasts or hADSCs,HemSCs could promote angiogenesis through para-secretion.Conclusions HemSCs may originate from normal MSCs,and owing to their powerful proliferative and angiogenic abilities,they could be considered an IH pathogenic factor.These characteristics demonstratet heir potential as a candidate seed cell in tissue engineering.Hanru YING Qianyi CHEN Xuanfeng CHEN Zhang YU MD Shih-Jen CHANG Lei CHANG Gang MA Yajing QIU Hui CHEN Xiaoxi LIN 2020Chinese Journal Of Plastic and Reconstructive Surgery2020,2,1:2
15An atypical tumor necrosis factor (TNF) receptor-associated factor-binding motif of B cell-activating factor belonging to the TNF family (BAFF) receptor mediates induction of the noncanonical NF-kappaB signaling pathway 显示文摘Morrison MD Reiley W Zhang M 2005J Biol Chem2005,280,10:1
16Intrinsic fianetional relations between human cerebral cortex and thalamus显示文摘Zhang Dong-yang Snyder AZ Fox MD 2008J Neurep- hysiol2008,100,4:1
17Reg gene family and human diseases显示文摘Zhang YW Ding LS Lai MD 2003World J Gastroenterol2003,9,12:1
18Secretagogin is expressed in sensory CGRP neurons and in spinal cord of mouse and complements other calcium-binding proteins, with a note on rat and human 显示文摘Shi TJ Xiang Q Zhang MD 2012Mol Pain2012,8,:1
19Mutations in p53,p53 protein overexpression and breast cancer survival 显示文摘Rossner P Jr Gammon MD Zhang YJ 2009J Cell Mol Med2009,13,9:1
20Genetic polymorphisms in the apoptosis-associated genes FAS and FASL and breast cancer risk 显示文摘Crew KD Gammon MD Terry MB Zhang FF Agrawal M Eng SM 2007Carcinogenesis2007,28,12:1
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