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   195452篇
  免费   12182篇
  国内免费   1345篇
耳鼻咽喉   2099篇
儿科学   6238篇
妇产科学   4696篇
基础医学   27654篇
口腔科学   5985篇
临床医学   16800篇
内科学   43038篇
皮肤病学   4658篇
神经病学   18831篇
特种医学   5966篇
外国民族医学   24篇
外科学   22241篇
综合类   2032篇
一般理论   95篇
预防医学   15632篇
眼科学   3209篇
药学   14968篇
  3篇
中国医学   934篇
肿瘤学   13876篇
  2023年   1281篇
  2022年   1152篇
  2021年   5214篇
  2020年   3310篇
  2019年   4597篇
  2018年   5364篇
  2017年   4105篇
  2016年   4604篇
  2015年   5187篇
  2014年   6844篇
  2013年   9329篇
  2012年   13520篇
  2011年   14064篇
  2010年   8144篇
  2009年   6961篇
  2008年   11579篇
  2007年   11804篇
  2006年   11005篇
  2005年   10373篇
  2004年   10011篇
  2003年   9281篇
  2002年   8845篇
  2001年   4204篇
  2000年   3992篇
  1999年   3489篇
  1998年   1885篇
  1997年   1516篇
  1996年   1332篇
  1995年   1213篇
  1994年   1097篇
  1993年   1003篇
  1992年   2025篇
  1991年   1933篇
  1990年   1659篇
  1989年   1601篇
  1988年   1479篇
  1987年   1303篇
  1986年   1304篇
  1985年   1133篇
  1984年   879篇
  1983年   812篇
  1982年   592篇
  1981年   489篇
  1980年   462篇
  1979年   631篇
  1978年   484篇
  1975年   472篇
  1974年   529篇
  1973年   485篇
  1972年   447篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
93.
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   
94.
Familial Cancer - The risk of radiotherapy-induced malignancies (RIMs) is a concern when treating Li–Fraumeni syndrome (LFS) or Li–Fraumeni Like (LFL) patients. However, the type of...  相似文献   
95.
96.
Purpose: To evaluate the rate and onset of intraoperative and postoperative complications post-phacoemulsification. Methods: One hundred sixty-two eyes of 145 patients with uveitis who underwent phacoemulsification between 2006 and 2009 were identified through surgical record review. Fifty-nine eyes of 46 patients met the inclusion criteria. Hazard ratio (HR) and Kaplan-Meier survival probability were calculated for each class of uveitis. Results: Macular edema (ME) resulted to be associated to chronic postoperative inflammation (r?=?0.6; p?=?0.00) and mostly related to patients who presented more than one postoperative relapse/year (r?=?0.2; p?=?0.02). Fuchs uveitis resulted to be a risk factor for posterior capsule opacification (PCO) (HR 3.36 IC95%1.0-10.5; p?=?0.03). Hypotony and elevated intraocular pressure (IOP) were detected in the anterior uveitis group (0.02 EY). Conclusion: The HR to develop ME was significantly related to chronic anterior uveitis. PCO and elevated IOP are most frequent in Fuchs uveitis. The postoperative visual acuity result was good among all the uveitis groups.  相似文献   
97.
98.
99.
100.

Background

Total ankle replacement (TAR) represents an alternative to fusion for the treatment of end-stage ankle osteoarthritis. The aim of the present study was to retrospectively assess the frequency of infections between TARs with anterior and lateral transfibular approach at 12-months follow-up.

Methods

81 TARs through an anterior approach and 69 TARs through a lateral approach were performed between May 2011 and July 2015. We compared surgical time and tourniquet time, as well as superficial and deep infections frequency during the first 12 postoperative months.

Results

In the anterior approach group, there were 3 (3.7%) deep infections and 4 (4.9%) superficial wound infections. In the lateral approach group, there were 1 (1.4%) deep infection and 2 superficial wound infections (2.9%). There were not statistically significant differences between the groups. There was a significant difference between anterior approach (115 minutes) and lateral approach group (179 minutes) in terms of surgical time (P < 0.001).

Conclusions

The frequency of superficial and deep periprosthetic infections during the first postoperative year was not significantly different in the lateral approach group compared to the anterior approach group, despite the significantly longer surgical time in the lateral transfibular approach group.  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