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   4072567篇
  免费   299209篇
  国内免费   7068篇
耳鼻咽喉   58141篇
儿科学   128377篇
妇产科学   108689篇
基础医学   585805篇
口腔科学   116136篇
临床医学   373672篇
内科学   780003篇
皮肤病学   87155篇
神经病学   332392篇
特种医学   154952篇
外国民族医学   1329篇
外科学   607652篇
综合类   90135篇
现状与发展   13篇
一般理论   1650篇
预防医学   331322篇
眼科学   96363篇
药学   304267篇
  14篇
中国医学   7977篇
肿瘤学   212800篇
  2019年   33238篇
  2018年   47267篇
  2017年   35393篇
  2016年   39037篇
  2015年   44109篇
  2014年   61568篇
  2013年   93842篇
  2012年   130555篇
  2011年   138114篇
  2010年   80819篇
  2009年   75417篇
  2008年   128984篇
  2007年   137448篇
  2006年   137819篇
  2005年   134021篇
  2004年   128571篇
  2003年   123358篇
  2002年   120341篇
  2001年   176633篇
  2000年   182158篇
  1999年   154178篇
  1998年   45955篇
  1997年   40767篇
  1996年   40321篇
  1995年   38611篇
  1994年   35980篇
  1993年   33773篇
  1992年   122496篇
  1991年   119469篇
  1990年   116064篇
  1989年   111789篇
  1988年   103679篇
  1987年   101779篇
  1986年   96097篇
  1985年   92307篇
  1984年   69753篇
  1983年   59516篇
  1982年   36095篇
  1979年   65438篇
  1978年   46390篇
  1977年   39001篇
  1976年   37103篇
  1975年   39393篇
  1974年   48032篇
  1973年   45763篇
  1972年   43271篇
  1971年   40457篇
  1970年   37715篇
  1969年   35492篇
  1968年   32620篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  相似文献   
63.
64.
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   
65.
66.
67.
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   
68.
69.
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   
70.
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