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   2393988篇
  免费   186239篇
  国内免费   9796篇
耳鼻咽喉   30656篇
儿科学   78224篇
妇产科学   65457篇
基础医学   339556篇
口腔科学   65915篇
临床医学   225493篇
内科学   474419篇
皮肤病学   52826篇
神经病学   198643篇
特种医学   92320篇
外国民族医学   622篇
外科学   352335篇
综合类   55350篇
现状与发展   3篇
一般理论   841篇
预防医学   200756篇
眼科学   51843篇
药学   172218篇
  11篇
中国医学   4914篇
肿瘤学   127621篇
  2018年   26452篇
  2017年   20384篇
  2016年   23282篇
  2015年   26348篇
  2014年   36591篇
  2013年   55998篇
  2012年   72247篇
  2011年   77283篇
  2010年   46567篇
  2009年   44292篇
  2008年   71271篇
  2007年   75583篇
  2006年   76871篇
  2005年   74283篇
  2004年   70822篇
  2003年   68168篇
  2002年   65386篇
  2001年   109621篇
  2000年   112717篇
  1999年   94606篇
  1998年   28211篇
  1997年   25360篇
  1996年   25956篇
  1995年   25556篇
  1994年   23934篇
  1993年   22432篇
  1992年   77375篇
  1991年   75541篇
  1990年   72899篇
  1989年   69273篇
  1988年   64387篇
  1987年   63100篇
  1986年   59943篇
  1985年   57619篇
  1984年   43912篇
  1983年   37032篇
  1982年   22920篇
  1981年   20477篇
  1980年   19165篇
  1979年   39717篇
  1978年   28780篇
  1977年   23905篇
  1976年   22743篇
  1975年   23478篇
  1974年   28134篇
  1973年   27193篇
  1972年   25135篇
  1971年   23291篇
  1970年   21405篇
  1969年   19820篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
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   
34.
35.
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   
36.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
37.
38.
39.
40.
Advancement in microelectromechanical system has facilitated the microfabrication of polymeric substrates and the development of the novel class of controlled drug delivery devices. These vehicles have specifically tailored three dimensional physical and chemical features which together, provide the capacity to target cell, stimulate unidirectional controlled release of therapeutics and augment permeation across the barriers. Apart from drug delivery devices microfabrication technology’s offer exciting prospects to generate biomimetic gastrointestinal tract models. BioMEMS are capable of analysing biochemical liquid sample like solution of metabolites, macromolecules, proteins, nucleic acid, cells and viruses. This review summarized multidisciplinary application of biomedical microelectromechanical systems in drug delivery and its potential in analytical procedures.  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