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   5276篇
  免费   305篇
  国内免费   69篇
耳鼻咽喉   50篇
儿科学   172篇
妇产科学   80篇
基础医学   626篇
口腔科学   188篇
临床医学   334篇
内科学   1343篇
皮肤病学   111篇
神经病学   263篇
特种医学   322篇
外科学   1131篇
综合类   13篇
预防医学   79篇
眼科学   37篇
药学   269篇
中国医学   8篇
肿瘤学   624篇
  2023年   28篇
  2022年   48篇
  2021年   108篇
  2020年   82篇
  2019年   104篇
  2018年   131篇
  2017年   108篇
  2016年   133篇
  2015年   146篇
  2014年   205篇
  2013年   236篇
  2012年   369篇
  2011年   384篇
  2010年   196篇
  2009年   155篇
  2008年   339篇
  2007年   378篇
  2006年   350篇
  2005年   362篇
  2004年   313篇
  2003年   312篇
  2002年   315篇
  2001年   45篇
  2000年   49篇
  1999年   43篇
  1998年   73篇
  1997年   46篇
  1996年   63篇
  1995年   40篇
  1994年   61篇
  1993年   35篇
  1992年   42篇
  1991年   37篇
  1990年   23篇
  1989年   24篇
  1988年   19篇
  1987年   21篇
  1986年   17篇
  1985年   18篇
  1984年   23篇
  1983年   15篇
  1982年   27篇
  1981年   14篇
  1980年   15篇
  1979年   13篇
  1978年   14篇
  1977年   12篇
  1976年   8篇
  1975年   8篇
  1974年   9篇
排序方式: 共有5650条查询结果,搜索用时 15 毫秒
71.
Guidelines for treatment of ulcerative colitis in children   总被引:2,自引:0,他引:2  
This paper introduces the guidelines for treatment of ulcerative colitis in children, created by the working group of the Japanese Society for Pediatric Gastroenterology, Hepatology and Nutrition (Chair: Yuichiro Yamashiro) and the Japanese Society for Pediatric Inflammatory Bowel Disease (IBD) (Chair: Akio Kobayashi). The ideas of the working group, with regard to the fundamental differences in medical treatment between children and adults, included: (1) for children, intensive medical treatment including appropriate systemic management is important during the acute phase of illness. (2) Treatment with steroids, which can cause growth disturbances, should not be continued for long periods of time. (3) Pulsed steroid therapy, selective removal of blood cells, and intravenous infusion of cyclosporin should be included in the therapeutic option for severe and fluminant cases.  相似文献   
72.
73.
PURPOSE: Galectin-9, a member of the beta-galactoside-binding galectin family, induces aggregation of certain cell types. We assessed the contribution of galectin-9 to the aggregation of breast cancer cells as well as the relation between galectin-9 expression in tumor tissue and distant metastasis in patients with breast cancer. EXPERIMENTAL DESIGN: Subclones of MCF-7 breast cancer cells with high or low levels of galectin-9 expression were established and either cultured on plastic dishes or transplanted into nude mice. The tumors of 84 patients with breast cancer were tested for galectin-9 expression by immunohistochemistry. The patients were followed up for 14 years. RESULTS: MCF-7 subclones with a high level of galectin-9 expression formed tight clusters during proliferation in vitro, whereas a subclone (K10) with the lowest level of galectin-9 expression did not. However, K10 cells stably transfected with a galectin-9 expression vector aggregated in culture and in nude mice. Ectopic expression of galectin-9 also reduced MCF-7 cell adhesion to extracellular matrix proteins. Tumors of 42 of the 84 patients were galectin-9 positive, and those of 19 of the 21 patients with distant metastasis were galectin-9 negative. None of the 13 patients with galectin-9-positive tumors and lymph node metastasis up to level II manifested distant metastasis. The cumulative disease-free survival ratio for galectin-9-positive patients was more favorable than that for the galectin-9-negative group (P < 0.0001). Multivariate analysis revealed that galectin-9 status influenced distant metastasis independently of and to a greater extent than lymph node metastasis. CONCLUSIONS: Galectin-9 is a possible prognostic factor with antimetastatic potential in breast cancer.  相似文献   
74.
A case of sudden cardiopulmonary arrest in a 3‐month‐old girl is presented. The patient had barely recovered from hypoxic encephalopathy when she presented with repeated respiratory distress. Computed tomography and endoscopic analysis revealed a shiny polyp in the lateral wall of the nasopharynx, and this polyp was suspected to be the main cause of respiratory distress. After referral to our hospital, surgical removal was performed, and the histopathological diagnosis was hairy polyp. Hairy polyp is a rare congenital benign tumor that sometimes induces respiratory distress. This polyp can potentially induce a life‐threatening event. In a systematic review of 40 reported cases, polyps of ≤3.0 cm in diameter have a higher risk of respiratory distress than do those >3.0 cm in diameter (P = 0.01). Small hairy polyps may be lethal because of delayed diagnosis. To locate small hairy polyps, physicians should not hesitate to perform further examination because there is the possibility of oversight with only physical examination.  相似文献   
75.
A microvascular density (MVD) counting method for reversion‐inducing cysteine‐rich protein with Kazal motifs (RECK) expression, using a digital image analysis tool, has advantages over manual counting by microscope. Thirty glioma cases with RECK staining were photographed at a magnification of 200× high power field and the photographs in RGB images were analyzed, and stained vessels were captured and were counted automatically. MVD with RECK expression using a digital image analysis tool showed comparable results to those of the manual method. RECK intensity expression could show linear correlation with grades of glioma by the digital method, which was superior compared to the manual method. The present method is recommended to researchers undertaking MVD study for glioma.  相似文献   
76.
We describe the imaging of unusual dislocation of right coronary cusp into left ventricular outflow tract (LVOT) due to the infective endocarditis. Although the two‐dimensional echocardiography identified a protruding mass in LVOT, the three‐dimensional echocardiography precisely demonstrated the spatial anatomy of the aortic root, which was confirmed by the surgical operation, implicating the usefulness of three‐dimensional echocardiography in this rare anomaly.  相似文献   
77.
78.
79.
80.
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