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   704673篇
  免费   49960篇
  国内免费   1297篇
耳鼻咽喉   9170篇
儿科学   23267篇
妇产科学   17599篇
基础医学   110398篇
口腔科学   19954篇
临床医学   63687篇
内科学   134253篇
皮肤病学   16160篇
神经病学   49440篇
特种医学   25755篇
外国民族医学   76篇
外科学   104576篇
综合类   14814篇
现状与发展   2篇
一般理论   160篇
预防医学   51349篇
眼科学   16315篇
药学   53939篇
  3篇
中国医学   2356篇
肿瘤学   42657篇
  2019年   5435篇
  2018年   7866篇
  2017年   6111篇
  2016年   6822篇
  2015年   7552篇
  2014年   10276篇
  2013年   15387篇
  2012年   20526篇
  2011年   21509篇
  2010年   12728篇
  2009年   11937篇
  2008年   19999篇
  2007年   21529篇
  2006年   21930篇
  2005年   20462篇
  2004年   20012篇
  2003年   18964篇
  2002年   18472篇
  2001年   36346篇
  2000年   36913篇
  1999年   30381篇
  1998年   7876篇
  1997年   6664篇
  1996年   6973篇
  1995年   6628篇
  1994年   6104篇
  1993年   5593篇
  1992年   22969篇
  1991年   22937篇
  1990年   22319篇
  1989年   22087篇
  1988年   20040篇
  1987年   19428篇
  1986年   18474篇
  1985年   17313篇
  1984年   12702篇
  1983年   10745篇
  1982年   5923篇
  1979年   11521篇
  1978年   8130篇
  1977年   6832篇
  1976年   6597篇
  1975年   7271篇
  1974年   8498篇
  1973年   8146篇
  1972年   7661篇
  1971年   7131篇
  1970年   6878篇
  1969年   6306篇
  1968年   5781篇
排序方式: 共有10000条查询结果,搜索用时 15 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