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   2588046篇
  免费   184529篇
  国内免费   7568篇
耳鼻咽喉   34273篇
儿科学   85206篇
妇产科学   71582篇
基础医学   363617篇
口腔科学   69666篇
临床医学   234514篇
内科学   515504篇
皮肤病学   62463篇
神经病学   213503篇
特种医学   99879篇
外国民族医学   736篇
外科学   386421篇
综合类   50391篇
现状与发展   5篇
一般理论   968篇
预防医学   196171篇
眼科学   56663篇
药学   187990篇
  8篇
中国医学   5331篇
肿瘤学   145252篇
  2021年   19982篇
  2019年   20622篇
  2018年   29291篇
  2017年   22593篇
  2016年   26224篇
  2015年   29501篇
  2014年   40446篇
  2013年   60423篇
  2012年   80225篇
  2011年   84494篇
  2010年   51005篇
  2009年   49144篇
  2008年   79028篇
  2007年   83842篇
  2006年   85572篇
  2005年   81731篇
  2004年   78732篇
  2003年   76040篇
  2002年   73338篇
  2001年   128412篇
  2000年   131335篇
  1999年   110505篇
  1998年   31256篇
  1997年   27922篇
  1996年   28220篇
  1995年   27383篇
  1994年   25069篇
  1993年   23419篇
  1992年   85162篇
  1991年   81565篇
  1990年   78788篇
  1989年   76065篇
  1988年   69469篇
  1987年   68000篇
  1986年   63545篇
  1985年   60513篇
  1984年   44942篇
  1983年   37944篇
  1982年   22459篇
  1981年   19985篇
  1979年   38960篇
  1978年   27441篇
  1977年   23254篇
  1976年   21496篇
  1975年   22817篇
  1974年   26790篇
  1973年   25374篇
  1972年   23752篇
  1971年   21957篇
  1970年   20184篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
43.
44.
45.
The value of adding simeprevir (SMV) vs placebo (PBO) to peginterferon and ribavirin (PR) for treatment of chronic hepatitis C virus infection was examined using patient‐reported outcomes (PROs); further, concordance of PROs with virology endpoints and adverse events (AEs) was explored. Patients (= 768 SMV/PR,= 393 PBO/PR) rated fatigue (FSS), depressive symptoms (CES‐D) and functional impairment (WPAI: Hepatitis C Productivity, Daily Activity and Absenteeism) at baseline and throughout treatment in three randomised, double‐blind trials comparing the addition of SMV or PBO during initial 12 weeks of PR. PR was administered for 48 weeks (PBO group) and 24/48 weeks (SMV group) using a response‐guided therapy (RGT) approach. Mean PRO scores (except Absenteeism) worsened from baseline to Week 4 to the same extent in both groups but reverted after Week 24 for SMV/PR and only after Week 48 for PBO/PR. Accordingly, there was a significantly lower area under the curve (baseline–Week 60, AUC60) and fewer weeks with clinically important worsening of scores in the SMV/PR group at any time point. Incidences of patients with fatigue and anaemia AEs were similar in both groups, but FSS scores showed that clinically important increases in fatigue lasted a mean of 6.9 weeks longer with PBO/PR (P < 0.001). PRO score subgroup analysis indicated better outcomes for patients who met the criteria for RGT or achieved sustained virological response 12 weeks post‐treatment (SVR12); differences in mean PRO scores associated with fibrosis level were only observed with PBO/PR. Greater efficacy of SMV/PR enabled reduced treatment duration and reduced time with PR‐related AEs without adding to AE severity.  相似文献   
46.
Platelet transfusions are a life-saving medical intervention used for the treatment of thrombocytopenia or hemorrhage. Extensive research has gone into trying to understand how to store platelets prior to the transfusion event. Much has been learned about storage bag materials, synthetic solutions, and how temperature impacts platelet viability and function. While room temperature storage of platelets preserves 24-hour in vivo platelet recovery and survival there is a greater risk for bacterial growth. Therefore, cold storage of platelets has become attractive due to the reduction in potential bacterial proliferation and the maintenance of platelet function beyond 5 days of storage. Cold stored platelets, however, have their own set of challenges. Cold stored platelets become activated through several mechanisms. The morphological and molecular changes that occur due to cold exposure enhance their ability to participate in the hemostatic process at the cost of rapid clearance from circulation. This review focuses on the underlying mechanisms leading to cold platelet activation and the receptor modifications involved in platelet clearance.  相似文献   
47.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
48.
49.
ABSTRACT

Purpose

To investigate the expression of IL-11 and its receptor IL-11Rα and to quantify density of CD163+ M2 macrophages in proliferative diabetic retinopathy (PDR).  相似文献   
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