首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   126052篇
  免费   13944篇
  国内免费   9265篇
耳鼻咽喉   1637篇
儿科学   1370篇
妇产科学   1377篇
基础医学   14007篇
口腔科学   2253篇
临床医学   17303篇
内科学   19504篇
皮肤病学   1724篇
神经病学   7352篇
特种医学   4776篇
外国民族医学   78篇
外科学   14840篇
综合类   20714篇
现状与发展   42篇
一般理论   6篇
预防医学   8484篇
眼科学   3691篇
药学   12231篇
  94篇
中国医学   7072篇
肿瘤学   10706篇
  2024年   437篇
  2023年   2265篇
  2022年   4441篇
  2021年   6595篇
  2020年   5424篇
  2019年   4202篇
  2018年   4804篇
  2017年   4319篇
  2016年   4315篇
  2015年   6097篇
  2014年   7566篇
  2013年   6882篇
  2012年   8843篇
  2011年   9665篇
  2010年   6544篇
  2009年   5509篇
  2008年   6353篇
  2007年   6168篇
  2006年   6080篇
  2005年   6025篇
  2004年   3922篇
  2003年   3587篇
  2002年   3085篇
  2001年   2829篇
  2000年   2909篇
  1999年   3150篇
  1998年   2236篇
  1997年   2271篇
  1996年   1863篇
  1995年   1757篇
  1994年   1446篇
  1993年   918篇
  1992年   1114篇
  1991年   924篇
  1990年   733篇
  1989年   749篇
  1988年   618篇
  1987年   525篇
  1986年   484篇
  1985年   384篇
  1984年   221篇
  1983年   185篇
  1982年   142篇
  1981年   121篇
  1980年   100篇
  1979年   83篇
  1978年   45篇
  1977年   45篇
  1975年   43篇
  1972年   31篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
11.
12.
13.
14.
European Archives of Oto-Rhino-Laryngology - Several polymorphisms in a disintegrin and metalloproteinase 33 (ADAM33) have been implicated in susceptibility to allergic rhinitis (AR), but the...  相似文献   
15.
16.
BACKGROUNDGuillain-Barré syndrome (GBS) is a rare disorder that typically presents with ascending weakness, pain, paraesthesias, and numbness, which mimic the findings in lumbar spinal stenosis. Here, we report a case of severe lumbar spinal stenosis combined with GBS.CASE SUMMARYA 70-year-old man with a history of lumbar spinal stenosis presented to our emergency department with severe lower back pain and lower extremity numbness. Magnetic resonance imaging confirmed the diagnosis of severe lumbar spinal stenosis. However, his symptoms did not improve postoperatively and he developed dysphagia and upper extremity numbness. An electromyogram was performed. Based on his symptoms, physical examination, and electromyogram, he was diagnosed with GBS. After 5 d of intravenous immunoglobulin (0.4 g/kg/d for 5 d) therapy, he gained 4/5 of strength in his upper and lower extremities and denied paraesthesias. He had regained 5/5 of strength in his extremities when he was discharged and had no symptoms during follow-up.CONCLUSIONGBS should be considered in the differential diagnosis of spinal disorder, even though magnetic resonance imaging shows severe lumbar spinal stenosis. This case highlights the importance of a careful diagnosis when a patient has a history of a disease and comes to the hospital with the same or similar symptoms.  相似文献   
17.
18.
BackgroundIn the field of transplantation, inducing immune tolerance in recipients is of great importance. Blocking co-stimulatory molecule using anti-CD28 antibody could induce tolerance in a rat kidney transplantation model. Myeloid-derived suppressor cells (MDSCs) reveals strong immune suppressive abilities in kidney transplantation. Here we analyzed key genes of MDSCs leading to transplant tolerance in this model.MethodsMicroarray data of rat gene expression profiles under accession number GSE28545 in the Gene Expression Omnibus (GEO) database were analyzed. Running the LIMMA package in R language, the differentially expressed genes (DEGs) were found. Enrichment analysis of the DEGs was conducted in the Database for Annotation, Visualization and Integrated Discovery (DAVID) database to explore gene ontology (GO) annotation and their Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. Their protein-protein interactions (PPIs) were provided by STRING database and was visualized in Cytoscape. Hub genes were carried out by CytoHubba.ResultsThree hundred and thirty-eight DEGs were exported, including 27 upregulated and 311 downregulated genes. The functions and KEGG pathways of the DEGs were assessed and the PPI network was constructed based on the string interactions of the DEGs. The network was visualized in Cytoscape; the entire PPI network consisted of 192 nodes and 469 edges. Zap70, Cdc42, Stat1, Stat4, Ccl5 and Cxcr3 were among the hub genes.ConclusionsThese key genes, corresponding proteins and their functions may provide valuable background for both basic and clinical research and could be the direction of future studies in immune tolerance, especially those examining immunocyte-induced tolerance.  相似文献   
19.
20.
目的本研究立足于项目组前期研究的成果上,积极探索吉林辽宁两省目标设置水平的差异,并进一步探究受目标设置影响下的工作落实结果情况,探讨产生差异的原因。 方法以系统穷尽的方式收集吉林辽宁两省2000至2017年有关目标与工作落实情况的指标,利用Spearman相关和线性回归分析吉林辽宁两省目标设置对于突发应急工作落实情况的影响。 结果吉林辽宁两省突发应急领域的目标设置水平与工作落实情况总体均呈现上升趋势,截至2017年,吉林目标设置水平与工作落实情况分别为46%与60%,辽宁为60%与53.3%,且目标设置水平与工作落实呈正相关。 结论有公众需要为依据且定量可考的目标设置对于工作落实、推进、完善具有积极的正反馈作用,建立科学量化的突发应急目标设置评价体系是适宜可行的。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号