全文获取类型
收费全文 | 39005篇 |
免费 | 3298篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 291篇 |
儿科学 | 1724篇 |
妇产科学 | 1191篇 |
基础医学 | 5408篇 |
口腔科学 | 402篇 |
临床医学 | 4722篇 |
内科学 | 7153篇 |
皮肤病学 | 688篇 |
神经病学 | 4577篇 |
特种医学 | 810篇 |
外科学 | 3811篇 |
综合类 | 375篇 |
现状与发展 | 1篇 |
一般理论 | 75篇 |
预防医学 | 5255篇 |
眼科学 | 610篇 |
药学 | 2585篇 |
中国医学 | 35篇 |
肿瘤学 | 2671篇 |
出版年
2024年 | 62篇 |
2023年 | 583篇 |
2022年 | 947篇 |
2021年 | 1961篇 |
2020年 | 1165篇 |
2019年 | 1685篇 |
2018年 | 1901篇 |
2017年 | 1285篇 |
2016年 | 1456篇 |
2015年 | 1514篇 |
2014年 | 1988篇 |
2013年 | 2481篇 |
2012年 | 3613篇 |
2011年 | 3482篇 |
2010年 | 1750篇 |
2009年 | 1497篇 |
2008年 | 2300篇 |
2007年 | 2402篇 |
2006年 | 2032篇 |
2005年 | 1869篇 |
2004年 | 1597篇 |
2003年 | 1330篇 |
2002年 | 1204篇 |
2001年 | 186篇 |
2000年 | 141篇 |
1999年 | 217篇 |
1998年 | 240篇 |
1997年 | 145篇 |
1996年 | 124篇 |
1995年 | 122篇 |
1994年 | 119篇 |
1993年 | 104篇 |
1992年 | 79篇 |
1991年 | 71篇 |
1990年 | 70篇 |
1989年 | 49篇 |
1988年 | 41篇 |
1987年 | 34篇 |
1986年 | 47篇 |
1985年 | 44篇 |
1984年 | 40篇 |
1983年 | 42篇 |
1982年 | 35篇 |
1981年 | 43篇 |
1980年 | 51篇 |
1979年 | 36篇 |
1978年 | 23篇 |
1977年 | 18篇 |
1973年 | 21篇 |
1972年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
51.
Triplet morbidity and mortality in a large case series. 总被引:1,自引:0,他引:1
OBJECTIVE: A significant increase in the triplet birth rate has occurred recently. This rise is of concern, as these infants are historically reported to be at risk of adverse outcome. Thus, we examined the outcome of triplet births in a large contemporary case series. STUDY DESIGN: Since 1993, detailed clinical data have been collected on all patients admitted to our Neonatal Intensive Care Unit. We retrospectively analyzed this database to examine triplet outcome. RESULTS: A total of 51 consecutive sets of triplets were born over a 9-year period. The mean birth weight for triplets was 1789+/-505 g, mean gestational age was 32.6+/-2.7 weeks, with discordancy present in 17.6% of neonates. Complications of prematurity were infrequent. Triplet survival to discharge was 96%. CONCLUSIONS: This large contemporary case series of triplets demonstrates excellent survival with low associated morbidity. These data suggest that there may no longer be medical justification for offering selective fetal reduction to parents with triplet pregnancies. 相似文献
52.
Scarlett Lin Gomez Cynthia D O'Malley Antoinette Stroup Sarah J Shema William A Satariano 《BMC cancer》2007,7(1):193
Background
Colorectal cancer, if detected early, has greater than 90% 5-year survival. However, survival has been shown to vary across racial/ethnic groups in the United States, despite the availability of early detection methods. 相似文献53.
54.
Regulation of Neutrophil Apoptosis by Tumor Necrosis Factor-alpha : Requirement for TNFR55 and TNFR75 for Induction of Apoptosis In Vitro 总被引:7,自引:2,他引:5
55.
56.
57.
58.
Andrea DiMartini Lubna Javed Sarah Russell Mary Amanda Dew Mary Grace Fitzgerald Ashok Jain John Fung 《Liver transplantation》2005,11(6):679-683
Alcohol and tobacco use commonly co-occur, with at least 90% of those with an alcohol problem also using tobacco. Thus, 3 years ago when we discovered higher rate of late deaths due to lung and oropharyngeal cancer in patients who had received a transplant for alcoholic liver disease (ALD), we hypothesized that these patients were continuing to expose themselves to tobacco after liver transplantation (post-LTX) and that this behavior was increasing their risk for cancer. We subsequently began a prospective investigation of post-LTX tobacco use in patients having undergone LTX for ALD (n = 172). For 33 recipients we had data starting from our first assessment at 3 months post-LTX and for this subgroup we report on the details of the timing of tobacco use resumption and the redevelopment of nicotine addiction. We found that on average more than 40% are smoking across all time periods. ALD recipients resume smoking early post-LTX, increase their consumption over time, and quickly become tobacco dependent. These data highlight an underrecognized serious health risk for these patients and demonstrate our need for more stringent clinical monitoring and intervention for tobacco use in the pre- and post-LTX periods. 相似文献
59.
60.