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   705215篇
  免费   49985篇
  国内免费   1304篇
耳鼻咽喉   9173篇
儿科学   23277篇
妇产科学   17624篇
基础医学   110522篇
口腔科学   19980篇
临床医学   63733篇
内科学   134288篇
皮肤病学   16182篇
神经病学   49445篇
特种医学   25763篇
外国民族医学   76篇
外科学   104523篇
综合类   14870篇
现状与发展   2篇
一般理论   160篇
预防医学   51416篇
眼科学   16317篇
药学   54068篇
  3篇
中国医学   2374篇
肿瘤学   42708篇
  2019年   5442篇
  2018年   7867篇
  2017年   6117篇
  2016年   6837篇
  2015年   7564篇
  2014年   10282篇
  2013年   15414篇
  2012年   20551篇
  2011年   21545篇
  2010年   12781篇
  2009年   11973篇
  2008年   20047篇
  2007年   21566篇
  2006年   21948篇
  2005年   20492篇
  2004年   20042篇
  2003年   18986篇
  2002年   18482篇
  2001年   36347篇
  2000年   36911篇
  1999年   30396篇
  1998年   7880篇
  1997年   6664篇
  1996年   6977篇
  1995年   6637篇
  1994年   6101篇
  1993年   5593篇
  1992年   22978篇
  1991年   22934篇
  1990年   22320篇
  1989年   22094篇
  1988年   20054篇
  1987年   19429篇
  1986年   18487篇
  1985年   17313篇
  1984年   12713篇
  1983年   10753篇
  1982年   5925篇
  1979年   11529篇
  1978年   8131篇
  1977年   6837篇
  1976年   6597篇
  1975年   7271篇
  1974年   8502篇
  1973年   8143篇
  1972年   7662篇
  1971年   7128篇
  1970年   6878篇
  1969年   6307篇
  1968年   5783篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
Pharmaceutical Chemistry Journal - Use of formylindolylacetic acid as a reagent at the stage of preparing the glycosides of bis(indolyl)furan-2,5-diones and dioxane as solvent increased yields from...  相似文献   
112.
113.
114.
115.
116.
117.

Background

Inflammation and infections have been associated with prostate cancer progression. We assessed whether elevated serum cytokines or T. vaginalis seropositivity at the time of diagnosis was associated with higher grade or lethal prostate cancer.

Patients and Methods

Men with localized or metastatic prostate cancer were included in this study. Cytokine serum levels including interleukin (IL)-1α, IL-1β, IL-2, IL-6, IL-8, monocyte chemotactic protein 1 (CCL-2), tumor necrosis factor α, and growth-regulated oncogene α (CXCL-1) using a multiplex enzyme-linked immunosorbent assay and T. vaginalis serology were measured in blood samples at diagnosis.

Results

A total of 324 patients were identified at time of localized disease and 118 at time of metastatic disease. Of the 189 patients with localized disease and clinical follow-up data (median, 73 months), 28 developed lethal disease. There was no association between circulating cytokine levels above median concentrations nor T. vaginalis seropositivity and risk of intermediate- to high-risk or lethal prostate cancer.

Conclusion

Higher levels of serum cytokine levels and T. vaginalis seropositivity at diagnosis are not associated with high-grade or lethal prostate cancer and do not aid risk stratification of localized prostate cancer.  相似文献   
118.
119.

Background

Intramedullary nailing is considered a “gold standard” for treatment of tibial shaft fractures. However, some types of fractures are typically considered as “difficult for nailing”. This group includes the periarticular fractures, fractures of both bones at the same level, comminuted and segmental fractures of the tibia. Fixator-assisted nailing (FAN) is an effective method treatment of these types of fractures. The main requirements for the ideal reduction device are an ease of its installation and an ability of multiplanar fracture reduction. Fixator-assisted nailing (FAN) with the use of two perpendicular to each other monolateral tubular frames perfectly meets these requirements. In this study we present this new surgical technique and the analysis of first 30 cases.

Methods

A prospective analysis was conducted for 30 patients with “difficult for nailing” tibial fractures treated with fixator-assisted nailing in our institution between September 1st, 2017, and March 1st, 2018. The duration of surgery and its different stages, the time of fluoroscopy, difficulties encountered during surgery, were analyzed. Clinical and radiological methods were used to evaluated reduction quality.

Results

In all 30 cases the acceptable reduction was achieved. The mean duration of the surgical procedure was 73.7?±?3?min. The mean duration of fluoroscopy 85.9?±?4.8?s. In 7 cases we faced with technical difficulties, which were successfully addressed.

Conclusion

The described technique of FAN is an effective method for the treatment of “difficult for nailing” tibial fractures. Future multi-centered studies with a larger number of patients are needed to validate our results.  相似文献   
120.
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