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   16537篇
  免费   1022篇
  国内免费   67篇
耳鼻咽喉   260篇
儿科学   362篇
妇产科学   279篇
基础医学   2443篇
口腔科学   1726篇
临床医学   1335篇
内科学   3358篇
皮肤病学   411篇
神经病学   1217篇
特种医学   470篇
外科学   1772篇
综合类   46篇
一般理论   4篇
预防医学   1853篇
眼科学   168篇
药学   1253篇
中国医学   172篇
肿瘤学   497篇
  2023年   137篇
  2022年   172篇
  2021年   620篇
  2020年   429篇
  2019年   542篇
  2018年   673篇
  2017年   528篇
  2016年   506篇
  2015年   677篇
  2014年   815篇
  2013年   921篇
  2012年   1407篇
  2011年   1574篇
  2010年   828篇
  2009年   617篇
  2008年   1001篇
  2007年   1010篇
  2006年   816篇
  2005年   698篇
  2004年   584篇
  2003年   499篇
  2002年   409篇
  2001年   267篇
  2000年   251篇
  1999年   194篇
  1998年   99篇
  1997年   99篇
  1996年   83篇
  1995年   70篇
  1994年   67篇
  1993年   48篇
  1992年   90篇
  1991年   98篇
  1990年   61篇
  1989年   74篇
  1988年   76篇
  1987年   55篇
  1986年   63篇
  1985年   49篇
  1984年   29篇
  1983年   36篇
  1981年   25篇
  1980年   32篇
  1979年   35篇
  1978年   21篇
  1977年   24篇
  1975年   21篇
  1973年   20篇
  1970年   16篇
  1968年   32篇
排序方式: 共有10000条查询结果,搜索用时 750 毫秒
1.
2.
3.
4.
5.
The European Journal of Health Economics - The aims of this study were to assess whether there is a conceptual overlap between the questionnaires HIT-6 and EQ-5D and to develop a mapping algorithm...  相似文献   
6.
7.
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals.  相似文献   
8.
9.
10.

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   
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