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   2753065篇
  免费   192102篇
  国内免费   7887篇
耳鼻咽喉   36380篇
儿科学   89825篇
妇产科学   75156篇
基础医学   387006篇
口腔科学   73819篇
临床医学   248520篇
内科学   550473篇
皮肤病学   66745篇
神经病学   228576篇
特种医学   104523篇
外国民族医学   810篇
外科学   407284篇
综合类   51104篇
现状与发展   5篇
一般理论   1013篇
预防医学   211631篇
眼科学   59950篇
药学   199576篇
  8篇
中国医学   5824篇
肿瘤学   154826篇
  2021年   22619篇
  2019年   23581篇
  2018年   34898篇
  2017年   26263篇
  2016年   29866篇
  2015年   33587篇
  2014年   44719篇
  2013年   67167篇
  2012年   92459篇
  2011年   96817篇
  2010年   56997篇
  2009年   53549篇
  2008年   89465篇
  2007年   95052篇
  2006年   95752篇
  2005年   91901篇
  2004年   88115篇
  2003年   84698篇
  2002年   81468篇
  2001年   131054篇
  2000年   134063篇
  1999年   112963篇
  1998年   31757篇
  1997年   28373篇
  1996年   28630篇
  1995年   27770篇
  1994年   25414篇
  1993年   23737篇
  1992年   86796篇
  1991年   83036篇
  1990年   80180篇
  1989年   77355篇
  1988年   70750篇
  1987年   69157篇
  1986年   64609篇
  1985年   61547篇
  1984年   45772篇
  1983年   38655篇
  1982年   22897篇
  1981年   20315篇
  1979年   39703篇
  1978年   27976篇
  1977年   23775篇
  1976年   21899篇
  1975年   23328篇
  1974年   27442篇
  1973年   26037篇
  1972年   24373篇
  1971年   22545篇
  1970年   20784篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
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   
42.
43.
44.
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   
45.
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   
46.
47.
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   
48.
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