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   2637072篇
  免费   191307篇
  国内免费   7630篇
耳鼻咽喉   34754篇
儿科学   86573篇
妇产科学   72932篇
基础医学   371703篇
口腔科学   72362篇
临床医学   238393篇
内科学   521175篇
皮肤病学   64259篇
神经病学   219914篇
特种医学   101899篇
外国民族医学   744篇
外科学   393601篇
综合类   51285篇
一般理论   1027篇
预防医学   200863篇
眼科学   58052篇
药学   194058篇
  8篇
中国医学   5281篇
肿瘤学   147126篇
  2021年   20081篇
  2019年   23152篇
  2018年   30484篇
  2017年   23862篇
  2016年   26864篇
  2015年   30386篇
  2014年   41642篇
  2013年   62397篇
  2012年   82025篇
  2011年   86474篇
  2010年   52489篇
  2009年   50882篇
  2008年   80909篇
  2007年   85894篇
  2006年   87684篇
  2005年   83752篇
  2004年   81166篇
  2003年   78629篇
  2002年   75695篇
  2001年   129507篇
  2000年   132064篇
  1999年   111033篇
  1998年   30943篇
  1997年   27429篇
  1996年   27540篇
  1995年   28508篇
  1994年   26190篇
  1993年   24284篇
  1992年   86008篇
  1991年   82414篇
  1990年   79554篇
  1989年   76944篇
  1988年   70130篇
  1987年   68732篇
  1986年   64352篇
  1985年   61329篇
  1984年   45803篇
  1983年   38780篇
  1982年   23223篇
  1981年   20759篇
  1979年   39507篇
  1978年   28083篇
  1977年   23900篇
  1976年   22028篇
  1975年   23511篇
  1974年   27312篇
  1973年   25804篇
  1972年   24200篇
  1971年   22309篇
  1970年   20536篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Modified-release opioids are often prescribed for the management of moderate to severe acute pain following total hip and knee arthroplasty, despite recommendations against their use due to increasing concerns regarding harm. The primary objective of this multicentre study was to examine the impact of modified-release opioid use on the incidence of opioid-related adverse events compared with immediate-release opioid use, among adult inpatients following total hip or knee arthroplasty. Data for total hip and knee arthroplasty inpatients receiving an opioid analgesic for postoperative analgesia during hospitalisation were collected from electronic medical records of three tertiary metropolitan hospitals in Australia. The primary outcome was the incidence of opioid-related adverse events during hospital admission. Patients who received modified with or without immediate-release opioids were matched to those receiving immediate-release opioids only (1:1) using nearest neighbour propensity score matching with patient and clinical characteristics as covariates. This included total opioid dose received. In the matched cohorts, patients given modified-release opioids (n = 347) experienced a higher incidence of opioid-related adverse events overall, compared with those given immediate-release opioids only (20.5%, 71/347 vs. 12.7%, 44/347; difference in proportions 7.8% [95%CI 2.3–13.3%]). Modified-release opioid use was associated with an increased risk of harm when used for acute pain during hospitalisation after total hip or knee arthroplasty.  相似文献   
2.
3.
4.
5.
Neuroscience and Behavioral Physiology - We present here results from analysis of the formation of brain bioelectrical activity in children and adolescents living in the northern region of Russia...  相似文献   
6.
7.
8.
Graefe's Archive for Clinical and Experimental Ophthalmology - Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to...  相似文献   
9.
10.
In 2019, the scientists who discovered how cells sense and adapt to oxygen availability were awarded the Nobel Prize. This elegant sensing pathway is conserved throughout evolution, and it underpins the physiology and pathology that we, as clinicians in anaesthesia and critical care, encounter on a daily basis. The purpose of this review is to bring hypoxia-inducible factor, and the oxygen-sensing pathway as a whole, to the wider clinical community. We describe how this unifying mechanism was discovered, and how it orchestrates diverse changes such as erythropoiesis, ventilatory acclimatisation, pulmonary vascular remodelling and altered metabolism. We explore the lessons learnt from genetic disorders of oxygen sensing, and the wider implications in evolution of all animal species, including our own. Finally, we explain how this pathway is relevant to our clinical practice, and how it is being manipulated in new treatments for conditions such as cancer, anaemia and pulmonary hypertension.  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