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   45277篇
  免费   4404篇
  国内免费   3637篇
耳鼻咽喉   386篇
儿科学   480篇
妇产科学   620篇
基础医学   5445篇
口腔科学   999篇
临床医学   5944篇
内科学   6770篇
皮肤病学   513篇
神经病学   2366篇
特种医学   1712篇
外国民族医学   20篇
外科学   4665篇
综合类   7730篇
现状与发展   15篇
一般理论   6篇
预防医学   3059篇
眼科学   1208篇
药学   4650篇
  28篇
中国医学   2815篇
肿瘤学   3887篇
  2024年   151篇
  2023年   688篇
  2022年   1819篇
  2021年   2268篇
  2020年   1735篇
  2019年   1474篇
  2018年   1589篇
  2017年   1459篇
  2016年   1349篇
  2015年   2002篇
  2014年   2544篇
  2013年   2187篇
  2012年   3194篇
  2011年   3494篇
  2010年   2109篇
  2009年   1747篇
  2008年   2239篇
  2007年   2299篇
  2006年   2265篇
  2005年   2061篇
  2004年   1698篇
  2003年   1817篇
  2002年   1628篇
  2001年   1384篇
  2000年   1220篇
  1999年   1309篇
  1998年   878篇
  1997年   805篇
  1996年   635篇
  1995年   581篇
  1994年   510篇
  1993年   259篇
  1992年   348篇
  1991年   289篇
  1990年   271篇
  1989年   220篇
  1988年   212篇
  1987年   175篇
  1986年   147篇
  1985年   91篇
  1984年   76篇
  1983年   33篇
  1982年   18篇
  1981年   15篇
  1980年   14篇
  1979年   6篇
  1978年   2篇
  1970年   1篇
  1969年   1篇
  1964年   1篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
991.
中国居民膳食指南在内科住院患者健康教育中的应用   总被引:1,自引:0,他引:1  
石艳伟 《护理学杂志》2013,28(11):72+96
目的探讨《中国居民膳食指南》在住院患者健康教育中的应用效果。方法对64例住院患者应用《中国居民膳食指南》进行健康教育,并以问卷调查方式了解患者对健康教育知识掌握情况。结果健康教育后患者营养知识评分显著高于教育前(均P<0.01)。结论应用中国居民膳食指南对患者进行健康教育,可以有效提高患者饮食的合理性和科学性,为疾病的早日康复打下良好的基础。  相似文献   
992.
【摘要】 目的 探讨连续性血液净化(CBP)对重症急性胰腺炎(SAP)患者血浆炎症介质的影响。方法 对36例重症急性胰腺炎患者进行CBP治疗,使用ELISA法检测治疗前和治疗后24 h、48 h血浆TNF -α、IL -1β、IL -6、IL -8的浓度,并与同期健康人群做比较。结果 31例患者好转出院,存活率为86.1%,血生化指标明显改善;SAP患者血浆TNF -α、IL -1β、IL -6、IL -8浓度显著高于正常对照组,CBP治疗24 h后四种细胞因子明显低于治疗前水平(P<0.05),治疗48 h后有不同程度的回升,但仍低于治疗前水平(P<0.05)。结论 CBP可有效清除SAP患者血浆炎症介质,从而阻断全身炎症反应,改善预后。  相似文献   
993.
We objectively appraised available evidence regarding the threshold for the number of polymorphonuclear leukocytes required in frozen section tests used to diagnose periprosthetic infection. Pooled summary estimates for sensitivity, specificity, positive likelihood ratio, negative likelihood ratio and diagnostic odds ratio (OR) were compared for ten and five polymorphonuclear leukocytes per high power field as the threshold. The total cohort included 1011 patients and the rate of infection was 19.2%. Although there was no difference in sensitivity or diagnostic OR, specificity was significantly higher for ten than for five polymorphonuclear leukocytes per high power field (p = 0.007) In sum, a threshold of 10 polymorphonuclear leukocytes is better for diagnosing periprosthetic infections.  相似文献   
994.

Background

Potential morbidities related to multiport laparoscopic surgeries have led to the current excitement about single-incision laparoscopic techniques. However, multiport laparoscopy is technically demanding and ergonomically challenging. We present our technique of using the Alexis wound retractor and a surgical glove to fashion an access port and the da Vinci surgical robot to perform single-incision anterior resection.

Methods

Through a small transumbilical incision, an Alexis wound retractor and a surgical glove are fashioned as an access port. Appropriate trocars are then inserted through the cut fingertips of the glove and secured. A three-arm da Vinci robot with a 30° up-scope was used.

Results

Twenty-two patients (12 males, 10 females) with a mean age of 58.5 years (range = 35–70) underwent robotic single-incision anterior resection for sigmoid colon cancer with this technique. There was no conversion to open surgery and one case was converted to multiport surgery. The mean estimated blood loss was 24.5 ml (range = 5–230), the mean operating time was 167.5 min (range = 112–251), the median skin incision length was 4.7 cm (range = 4.2–8.0), the mean proximal and distal resection margins were 12.9 cm (range = 7.5–25.1) and 12.3 cm (range = 4.5–19.2), respectively, and the mean lymph node harvest was 16.8 (range = 0–42). The immediate postoperative pain score was 2.8 (range = 1–5) and on postoperative day 1 it was 1.4 (range = 1–3). The mean length of hospital stay was 6 days (range = 5–9).

Conclusion

Robotic single-incision anterior resection is a safe and viable option for selected patients. Merging the principles of reduced parietal trauma and better cosmesis with the ergonomic advantages of the robotic system is a novel evolution of single-incision laparoscopic surgery.  相似文献   
995.
996.

Background and purpose

Femoral head necrosis (FHN) is a debilitating disease which seriously affects the patients’ quality of life, especially the young. The porous tantalum rod has the advantages of high volumetric porosity, low modulus of elasticity, and excellent osteoinduction, with exceptional biocompatibility and safety record in clinical application, which makes it an ideal choice for FHN patients. However, there has not been a systematic analysis for its efficacy and safety.

Methods

This meta-analysis of six randomized controlled trials and controlled clinical trials with 256 participants was performed to investigate the efficacy and safety of porous tantalum rod, by means of comparing with vascularized or non-vascularized bone grafting.

Results

Porous tantalum has its advantages in functional evaluation of Harris Hip Score, with a significant lower incidence of femoral head collapse. The surgical blood loss is low and the operative time is short with no increase in complication rate.

Interpretation

Our preliminary analysis provided that the porous tantalum rod was a less invasive method and was effective and well tolerant for early-stage FHN patients. Further specially designed clinical trials for long-term follow-up and socioeconomic assessment are needed before a final determination.  相似文献   
997.
998.
999.
1000.
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