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   196223篇
  免费   2141篇
  国内免费   114篇
耳鼻咽喉   1242篇
儿科学   6969篇
妇产科学   3254篇
基础医学   19143篇
口腔科学   2142篇
临床医学   13738篇
内科学   35843篇
皮肤病学   975篇
神经病学   18144篇
特种医学   9930篇
外科学   33038篇
综合类   2390篇
现状与发展   1篇
预防医学   18532篇
眼科学   3096篇
药学   11020篇
中国医学   675篇
肿瘤学   18346篇
  2023年   137篇
  2022年   295篇
  2021年   545篇
  2020年   268篇
  2019年   392篇
  2018年   22369篇
  2017年   17694篇
  2016年   19836篇
  2015年   1293篇
  2014年   1311篇
  2013年   1411篇
  2012年   7924篇
  2011年   22054篇
  2010年   19346篇
  2009年   11948篇
  2008年   20303篇
  2007年   22589篇
  2006年   1533篇
  2005年   3127篇
  2004年   4209篇
  2003年   5182篇
  2002年   3322篇
  2001年   1046篇
  2000年   1205篇
  1999年   895篇
  1998年   459篇
  1997年   417篇
  1996年   268篇
  1995年   254篇
  1994年   240篇
  1993年   213篇
  1992年   573篇
  1991年   553篇
  1990年   571篇
  1989年   516篇
  1988年   474篇
  1987年   401篇
  1986年   380篇
  1985年   392篇
  1984年   222篇
  1983年   187篇
  1982年   109篇
  1980年   116篇
  1979年   172篇
  1978年   134篇
  1977年   95篇
  1974年   143篇
  1973年   114篇
  1970年   103篇
  1969年   123篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.

Background

Controversy continues as to whether single-incision laparoscopic cholecystectomy, with the somewhat larger incision at the umbilicus, may lead to a worse postoperative quality of life and more pain compared with the more classic 4-port laparoscopic cholecystectomy. The aim of this study was to compare single-incision and 4-port laparoscopic cholecystectomy from the perspective of quality of life.

Methods

This study was a multicenter, parallel-group, open-label, randomized clinical trial. A total of 120 patients who were scheduled to undergo elective cholecystectomy were randomly assigned 1:1 into the single-incision laparoscopic cholecystectomy or the 4-port laparoscopic cholecystectomy group and then assessed continuously for 2 weeks during the postoperative period. The primary outcome was quality of life, defined as the time to resume normal daily activities. Postoperative pain was also assessed. To explore the heterogeneity of treatment effects, we assessed the interactions of sex, age, and working status on recovery time.

Results

A total of 58 patients in the single-incision group and 53 in the 4-port group (n?=?111, 47 male, mean age 57 years) were analyzed. The mean time to resume daily activities was 10.2 days and 8.8 days, respectively, for single-incision and 4-port laparoscopic cholecystectomy (95% confidence interval –0.4 to 3.2, P?=?.12). Similarly, the time to relief from postoperative pain did not differ significantly between the groups. Statistically insignificant but qualitative interactions were noted; in the subgroups of women, full-time workers, and patients younger than 60 years, recovery tended to be slower after single-incision laparoscopic cholecystectomy.

Conclusion

Postoperative quality of life did not differ substantially between single-incision laparoscopic cholecystectomy and 4-port laparoscopic cholecystectomy. Patients younger than 60 years, women, and full-time workers tended to have a somewhat slower recovery after single-incision laparoscopic cholecystectomy.  相似文献   
24.
A 23-year-old man was admitted for treatment of acute exacerbation of ileitis and perianal abscess caused by Crohn's disease. After incision and drainage of the abscess, coupled with antibiotic therapy, 6-mercaptopurine (6-MP) was commenced. His white blood cell (WBC) count on day 12 after initiation of 6-MP was not decreased. However, on day 24 he was re-admitted because of severe myelosuppression (WBC: 300/microl), which was complicated by the recurrence of the perianal abscess. Myelosuppression was prolonged and required the administration of granulocyte colony stimulating factor (G-CSF). G-CSF was continued for 17 days to achieve recovery of his WBC count to a normal level.  相似文献   
25.
26.
27.
28.
The aim of this study was to clarify vascular endothelial growth factor (VEGF) expression and angiogenesis in the patellar tendon (PT) autograft in the early phase after anterior cruciate ligament (ACL) reconstruction using a rabbit model. The right knees of 30 Japanese white rabbits underwent ACL reconstruction using the medial third of the PT complex. We evaluated the grafted tendon at 1, 2, 3, 4, and 8 weeks after ACL reconstruction by immunohistology for proliferating cell nuclear antigen, VEGF, and CD31, which is a marker for vascular endothelial cells. At week 1 , few cells were observed at the midsubstance of the grafted tendon. A number of proliferating cells were observed at the surface area of the PT graft 2 weeks after graft transplantation, while no vessel formation was observed in the graft at the same time. VEGF was highly expressed 2-3 weeks postoperatively. Vessel formation in the PT graft increased with time from 3 to 8 weeks after ACL reconstruction. The rates of proliferating cells and VEGF-expressing cells decreased with time from 3 to 8 weeks. This study has suggested that VEGF is involved in the graft remodeling process particularly at the early phase after ACL reconstruction.  相似文献   
29.
30.
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