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   4061987篇
  免费   286713篇
  国内免费   9148篇
耳鼻咽喉   56257篇
儿科学   132795篇
妇产科学   111472篇
基础医学   579881篇
口腔科学   113354篇
临床医学   374013篇
内科学   783160篇
皮肤病学   93513篇
神经病学   330120篇
特种医学   153631篇
外国民族医学   1148篇
外科学   605381篇
综合类   83861篇
现状与发展   15篇
一般理论   1651篇
预防医学   320055篇
眼科学   94489篇
药学   298705篇
  16篇
中国医学   7954篇
肿瘤学   216377篇
  2021年   32220篇
  2019年   32979篇
  2018年   45439篇
  2017年   34556篇
  2016年   39662篇
  2015年   44691篇
  2014年   62502篇
  2013年   94314篇
  2012年   127402篇
  2011年   135188篇
  2010年   81206篇
  2009年   77273篇
  2008年   126350篇
  2007年   134222篇
  2006年   136060篇
  2005年   131217篇
  2004年   126000篇
  2003年   121382篇
  2002年   117321篇
  2001年   184065篇
  2000年   188929篇
  1999年   159842篇
  1998年   47700篇
  1997年   41887篇
  1996年   42024篇
  1995年   40350篇
  1994年   37046篇
  1993年   34855篇
  1992年   125346篇
  1991年   121479篇
  1990年   118110篇
  1989年   114480篇
  1988年   105396篇
  1987年   103268篇
  1986年   97245篇
  1985年   93217篇
  1984年   69687篇
  1983年   59348篇
  1982年   35359篇
  1979年   63210篇
  1978年   44938篇
  1977年   37935篇
  1976年   35696篇
  1975年   38115篇
  1974年   45465篇
  1973年   43323篇
  1972年   40771篇
  1971年   38292篇
  1970年   35264篇
  1969年   33923篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
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   
72.
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   
73.
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   
74.
75.
Graefe's Archive for Clinical and Experimental Ophthalmology - To evaluate the long-term safety and efficacy of intrastromal bevacizumab for treatment of deep corneal neovascularization in...  相似文献   
76.
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   
77.
78.
79.
80.
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