全文获取类型
收费全文 | 218268篇 |
免费 | 4301篇 |
国内免费 | 159篇 |
专业分类
耳鼻咽喉 | 1772篇 |
儿科学 | 7787篇 |
妇产科学 | 3769篇 |
基础医学 | 22249篇 |
口腔科学 | 2102篇 |
临床医学 | 16784篇 |
内科学 | 39863篇 |
皮肤病学 | 1138篇 |
神经病学 | 20567篇 |
特种医学 | 10469篇 |
外科学 | 36019篇 |
综合类 | 3146篇 |
现状与发展 | 1篇 |
一般理论 | 40篇 |
预防医学 | 21394篇 |
眼科学 | 3298篇 |
药学 | 12407篇 |
中国医学 | 681篇 |
肿瘤学 | 19242篇 |
出版年
2023年 | 241篇 |
2022年 | 434篇 |
2021年 | 1168篇 |
2020年 | 663篇 |
2019年 | 1088篇 |
2018年 | 23006篇 |
2017年 | 18086篇 |
2016年 | 20365篇 |
2015年 | 2105篇 |
2014年 | 2389篇 |
2013年 | 2875篇 |
2012年 | 10416篇 |
2011年 | 24402篇 |
2010年 | 20624篇 |
2009年 | 13203篇 |
2008年 | 22305篇 |
2007年 | 24547篇 |
2006年 | 3494篇 |
2005年 | 5143篇 |
2004年 | 6026篇 |
2003年 | 6842篇 |
2002年 | 4768篇 |
2001年 | 659篇 |
2000年 | 683篇 |
1999年 | 534篇 |
1998年 | 679篇 |
1997年 | 623篇 |
1996年 | 432篇 |
1995年 | 430篇 |
1994年 | 386篇 |
1993年 | 320篇 |
1992年 | 271篇 |
1991年 | 286篇 |
1990年 | 306篇 |
1989年 | 253篇 |
1988年 | 217篇 |
1987年 | 178篇 |
1986年 | 154篇 |
1985年 | 152篇 |
1984年 | 159篇 |
1983年 | 138篇 |
1982年 | 173篇 |
1981年 | 155篇 |
1980年 | 145篇 |
1979年 | 76篇 |
1978年 | 81篇 |
1977年 | 74篇 |
1976年 | 69篇 |
1973年 | 59篇 |
1938年 | 61篇 |
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
31.
32.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial. 相似文献
33.
34.
Aoife De Brún Liran Shan Áine Regan Áine McConnon Patrick Wall 《Health communication》2016,31(10):1235-1241
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
35.
36.
37.
38.
39.
40.
Timothy W Puetz Kathryn M Beasman Patrick J O'Connor 《European journal of cardiovascular prevention and rehabilitation》2006,13(6):886-893
BACKGROUND: Physical activity is a healthful behavior that has promise for combating feelings of low energy and fatigue. Despite evidence suggesting that fatigue is a prodromal symptom of major cardiac events, improvements in feelings of energy and fatigue have largely been ignored by reviewers of cardiac rehabilitation literature who have focused on anxiety, depression and general measures of quality of life. DESIGN: A meta-analytical review. METHODS AND RESULTS: Computer databases were searched from January 1945 to May 2005 to identify relevant literature. A total of 36 studies consisting of 4765 subjects were included. Cardiac rehabilitation exercise programs were consistently associated with increases in energy and decreases in fatigue. The magnitude of the effect was moderately large (mean delta 0.51; 95% confidence interval 0.42-0.61) but was heterogeneous and modified by features of the research design. Comparison of effect sizes in cardiac rehabilitation studies concurrently measuring energy/fatigue, anxiety and depression suggest that exercise-based cardiac rehabilitation programs have larger effects on feelings of energy and fatigue compared with anxiety and depression. CONCLUSION: This review quantifies the potential benefit of cardiac rehabilitation exercise programs on feelings of energy and fatigue, and suggests that cardiac rehabilitation researchers and practitioners may benefit from examining, and perhaps even focusing on, feelings of energy and fatigue as an important outcome variable. A greater understanding of the effect of cardiac rehabilitation exercise programs on feelings of energy and fatigue will be reached when more true experiments are conducted thereby avoiding the primary limitation of the literature reviewed; that is, the frequent use of non-experimental research designs. 相似文献