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   97727篇
  免费   6064篇
  国内免费   844篇
耳鼻咽喉   1107篇
儿科学   3069篇
妇产科学   2390篇
基础医学   13101篇
口腔科学   2305篇
临床医学   7993篇
内科学   21259篇
皮肤病学   2069篇
神经病学   8879篇
特种医学   4108篇
外国民族医学   23篇
外科学   13568篇
综合类   1858篇
一般理论   47篇
预防医学   5726篇
眼科学   1558篇
药学   7952篇
  6篇
中国医学   570篇
肿瘤学   7047篇
  2023年   412篇
  2022年   986篇
  2021年   1766篇
  2020年   1165篇
  2019年   1645篇
  2018年   2047篇
  2017年   1599篇
  2016年   1672篇
  2015年   1932篇
  2014年   2549篇
  2013年   3713篇
  2012年   4928篇
  2011年   5132篇
  2010年   3380篇
  2009年   2972篇
  2008年   4526篇
  2007年   4748篇
  2006年   4526篇
  2005年   4331篇
  2004年   4602篇
  2003年   4435篇
  2002年   4492篇
  2001年   3799篇
  2000年   3743篇
  1999年   3018篇
  1998年   1253篇
  1997年   1041篇
  1996年   948篇
  1995年   897篇
  1994年   802篇
  1993年   766篇
  1992年   1807篇
  1991年   1798篇
  1990年   1539篇
  1989年   1510篇
  1988年   1381篇
  1987年   1225篇
  1986年   1230篇
  1985年   1099篇
  1984年   796篇
  1983年   711篇
  1982年   472篇
  1981年   411篇
  1979年   581篇
  1978年   424篇
  1975年   450篇
  1974年   487篇
  1973年   465篇
  1972年   424篇
  1971年   401篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
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   
3.
4.
5.

Background

The ZOE-50 (NCT01165177) and ZOE-70 (NCT01165229) phase 3 clinical trials showed that the adjuvanted recombinant zoster vaccine (RZV) was ≥90% efficacious in preventing herpes zoster in adults. Here we present a comprehensive overview of the safety data from these studies.

Methods

Adults aged ≥50 (ZOE-50) and ≥70 (ZOE-70) years were randomly vaccinated with RZV or placebo. Safety analyses were performed on the pooled total vaccinated cohort, consisting of participants receiving at least one dose of RZV or placebo. Solicited and unsolicited adverse events (AEs) were collected for 7 and 30?days after each vaccination, respectively. Serious AEs (SAEs) were collected from the first vaccination until 12?months post-last dose. Fatal AEs, vaccination-related SAEs, and potential immune-mediated diseases (pIMDs) were collected during the entire study period.

Results

Safety was evaluated in 14,645 RZV and 14,660 placebo recipients. More RZV than placebo recipients reported unsolicited AEs (50.5% versus 32.0%); the difference was driven by transient injection site and solicited systemic reactions that were generally seen in the first week post-vaccination. The occurrence of overall SAEs (RZV: 10.1%; Placebo: 10.4%), fatal AEs (RZV: 4.3%; Placebo: 4.6%), and pIMDs (RZV: 1.2%; Placebo: 1.4%) was balanced between groups. The occurrence of possible exacerbations of pIMDs was rare and similar between groups. Overall, except for the expected local and systemic symptoms, the safety results were comparable between the RZV and Placebo groups irrespective of participant age, gender, or race.

Conclusions

No safety concerns arose, supporting the favorable benefit-risk profile of RZV.  相似文献   
6.
Although hepatitis E virus (HEV) is the primary cause of enterically transmitted acute hepatitis and jaundice in developing countries, locally acquired HEV infections are increasing in nonendemic countries. As such, HEV is emerging as an underdiagnosed cause of infection. This report describes three clinically variable cases of HEV infection with unusual clinical presentations. These cases highlight the fact that HEV should be considered in the differential diagnosis of patients with unexplained hepatitis (acute or chronic) with or without extrahepatic manifestations. HEV should also be considered in patients with persistently elevated liver enzymes who have not travelled to known HEV-endemic regions. Lack of knowledge among physicians and an absence of standardized diagnostic tests may result in increased morbidity and mortality from HEV infection.  相似文献   
7.
8.
9.
10.
The 2008 dioxin crisis occurred as a result of contamination of Irish pork. The event had significant implications for Ireland’s economy and the reputation of its agricultural industry, as well as raising concerns for human health. This study describes the results of a content analysis of Irish and UK newspaper coverage of the 2008 Irish dioxin crisis, as this is likely to provide insight into how public perceptions of this issue were shaped. Articles from 16 print publications were systematically sampled for the period December 2008 to February 2009. The resulting data set of 141 articles was examined using a coding protocol developed based on previous research and refined during piloting. Results indicated that the dioxin crisis was primarily portrayed by the media as an industry/economic crisis, dominant in 26.9% of articles in the sample. Within this dominant portrayal, the agricultural industry was frequently cited as being in crisis (42.6%); however, the implications of the crisis on the wider economic environment also received attention (17.7%). Differences between Irish and UK-based media were also examined, revealing that while the Irish media most frequently described the crisis in terms of its impact on the industry and economy, the UK media were more likely to portray the crisis as a risk to health. These dominant media messages and message framings have implications for the public understanding of the issue in each country and potential consequences regarding perception of the adequacy of existing food policy and regulatory oversight.  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