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   3930252篇
  免费   292443篇
  国内免费   6726篇
耳鼻咽喉   56439篇
儿科学   124461篇
妇产科学   105527篇
基础医学   565105篇
口腔科学   112348篇
临床医学   361115篇
内科学   750614篇
皮肤病学   83421篇
神经病学   319413篇
特种医学   151308篇
外国民族医学   1277篇
外科学   590288篇
综合类   89532篇
现状与发展   13篇
一般理论   1601篇
预防医学   317303篇
眼科学   93796篇
药学   294083篇
  14篇
中国医学   7545篇
肿瘤学   204218篇
  2018年   42151篇
  2017年   31980篇
  2016年   35678篇
  2015年   40296篇
  2014年   57637篇
  2013年   87685篇
  2012年   119238篇
  2011年   126774篇
  2010年   75407篇
  2009年   71366篇
  2008年   119354篇
  2007年   127163篇
  2006年   128377篇
  2005年   124776篇
  2004年   120037篇
  2003年   115499篇
  2002年   113131篇
  2001年   175013篇
  2000年   180522篇
  1999年   152757篇
  1998年   45573篇
  1997年   40420篇
  1996年   40005篇
  1995年   38313篇
  1994年   35717篇
  1993年   33535篇
  1992年   121567篇
  1991年   118595篇
  1990年   115260篇
  1989年   111031篇
  1988年   102907篇
  1987年   101057篇
  1986年   95408篇
  1985年   91682篇
  1984年   69237篇
  1983年   59070篇
  1982年   35785篇
  1981年   32030篇
  1979年   64950篇
  1978年   46065篇
  1977年   38658篇
  1976年   36861篇
  1975年   39071篇
  1974年   47643篇
  1973年   45355篇
  1972年   42864篇
  1971年   40110篇
  1970年   37345篇
  1969年   35143篇
  1968年   32282篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
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   
93.
94.
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   
95.
96.
97.
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   
98.
99.
100.
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   
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