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   3426773篇
  免费   256137篇
  国内免费   9201篇
耳鼻咽喉   46434篇
儿科学   113194篇
妇产科学   95742篇
基础医学   481761篇
口腔科学   94791篇
临床医学   314635篇
内科学   673718篇
皮肤病学   81403篇
神经病学   282386篇
特种医学   130785篇
外国民族医学   1111篇
外科学   512405篇
综合类   74066篇
现状与发展   7篇
一般理论   1334篇
预防医学   267530篇
眼科学   77704篇
药学   248285篇
  8篇
中国医学   7251篇
肿瘤学   187561篇
  2019年   27444篇
  2018年   38503篇
  2017年   29555篇
  2016年   33967篇
  2015年   38254篇
  2014年   53289篇
  2013年   79994篇
  2012年   106747篇
  2011年   113225篇
  2010年   67835篇
  2009年   64758篇
  2008年   105244篇
  2007年   111656篇
  2006年   113504篇
  2005年   109222篇
  2004年   104739篇
  2003年   100992篇
  2002年   97579篇
  2001年   165396篇
  2000年   169451篇
  1999年   142488篇
  1998年   41206篇
  1997年   36692篇
  1996年   36719篇
  1995年   35506篇
  1994年   32418篇
  1993年   30338篇
  1992年   110006篇
  1991年   105600篇
  1990年   102327篇
  1989年   98570篇
  1988年   90423篇
  1987年   88583篇
  1986年   82967篇
  1985年   79402篇
  1984年   59540篇
  1983年   50465篇
  1982年   30175篇
  1981年   26902篇
  1979年   52625篇
  1978年   37246篇
  1977年   31389篇
  1976年   29244篇
  1975年   30830篇
  1974年   36711篇
  1973年   35095篇
  1972年   32985篇
  1971年   30504篇
  1970年   28346篇
  1969年   26993篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia.  相似文献   
42.
43.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54&nbsp;Gy. We used the...  相似文献   
44.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  相似文献   
45.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
46.
47.
48.
Introduction: The Hedgehog (HH) pathway constitutes a collection of signaling molecules which critically influence embryogenesis. In adults, however, the HH pathway remains integral to the proliferation, maintenance, and apoptosis of adult stem cells including hematopoietic stem cells.

Areas covered: We discuss the current understanding of the HH pathway as it relates to normal hematopoiesis, the pathology of acute myeloid leukemia (AML), the rationale for and data from combination therapies including HH pathway inhibitors, and ultimately the prospects that might offer promise in targeting this pathway in AML.

Expert opinion: Efforts to target the HH pathway have been focused on impeding this disposition and restoring chemosensitivity to conventional myeloid neoplasm therapies. The year 2018 saw the first approval of a HH pathway inhibitor (glasdegib) for AML, though for an older population and in combination with an uncommonly-used therapy. Several other clinical trials with agents targeting modulators of HH signaling in AML and MDS are underway. Further study and understanding of the interplay between the numerous aspects of HH signaling and how it relates to the augmented survival of AML will provide a more reliable substrate for therapeutic strategies in patients with this poor-risk disease.  相似文献   

49.
50.
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