全文获取类型
收费全文 | 10522篇 |
免费 | 803篇 |
国内免费 | 422篇 |
专业分类
耳鼻咽喉 | 70篇 |
儿科学 | 71篇 |
妇产科学 | 25篇 |
基础医学 | 1089篇 |
口腔科学 | 157篇 |
临床医学 | 882篇 |
内科学 | 4365篇 |
皮肤病学 | 43篇 |
神经病学 | 282篇 |
特种医学 | 799篇 |
外国民族医学 | 1篇 |
外科学 | 962篇 |
综合类 | 1543篇 |
现状与发展 | 1篇 |
预防医学 | 183篇 |
眼科学 | 87篇 |
药学 | 853篇 |
6篇 | |
中国医学 | 96篇 |
肿瘤学 | 232篇 |
出版年
2024年 | 11篇 |
2023年 | 208篇 |
2022年 | 407篇 |
2021年 | 618篇 |
2020年 | 464篇 |
2019年 | 385篇 |
2018年 | 431篇 |
2017年 | 363篇 |
2016年 | 423篇 |
2015年 | 458篇 |
2014年 | 784篇 |
2013年 | 968篇 |
2012年 | 552篇 |
2011年 | 627篇 |
2010年 | 511篇 |
2009年 | 543篇 |
2008年 | 482篇 |
2007年 | 542篇 |
2006年 | 437篇 |
2005年 | 379篇 |
2004年 | 338篇 |
2003年 | 281篇 |
2002年 | 291篇 |
2001年 | 198篇 |
2000年 | 152篇 |
1999年 | 149篇 |
1998年 | 148篇 |
1997年 | 130篇 |
1996年 | 94篇 |
1995年 | 85篇 |
1994年 | 59篇 |
1993年 | 45篇 |
1992年 | 32篇 |
1991年 | 39篇 |
1990年 | 19篇 |
1989年 | 17篇 |
1988年 | 20篇 |
1987年 | 8篇 |
1986年 | 10篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
《Archives of Cardiovascular Diseases》2022,115(10):505-513
Central illustration: cumulative major adverse cardiac events (MACE) and bioresorbable vascular scaffold (BVS) thrombosis rates after 1, 2, 3, 4 and 5 years. 相似文献
3.
Jeffrey Buenaflor Parker Sommerville Hang Qian Christine Luscombe 《Macromolecular chemistry and physics.》2020,221(2)
A comparative study involving bimetallic nickel catalysts designed from disubstituted N,N,N′,N′‐tetra(diphenylphosphanylmethyl)benzene diamine bridging ligands is reported. Catalyst behavior is explored in the Kumada catalyst‐transfer polymerization (KCTP) using poly(3‐hexylthiophene) (P3HT) as the model system. The success of a controlled polymerization is monitored by analyzing monomer conversion, degree of polymerization, end‐group identity, and molecular weight distribution. The characterization of P3HT obtained from KCTP initiated with the bimetallic catalysts shows chain‐growth behavior; however, the presence of Br/Br end‐groups and broader molecular weight distribution reveals a reduced controlled polymerization compared to the commonly employed Ni(dppp)Cl2. The observed increase in intermolecular chain transfer and termination processes in KCTP initiation with the bimetallic catalysts can be attributed to a weaker Ni(0)‐π‐aryl complex interaction, which is caused by increased steric crowding of the coordination sphere. 相似文献
4.
5.
6.
《Journal of vascular and interventional radiology : JVIR》2020,31(4):630-634
PurposeTo retrospectively evaluate the safety and effectiveness of the Covera stent graft (SG) for the treatment of dysfunctional or thrombosed arteriovenous grafts (AVGs).Materials and MethodsWithin 29 months (February 2016–August 2018), 79 patients underwent Covera SG placement in the authors’ department for the treatment of dysfunctional AVGs. Data were available for 64 patients who underwent 64 procedures, using 64 devices. Minimum follow-up was 6 months, unless reintervention occurred. Mean follow-up was 277 days (6–923 days). Treatment characteristics were 51 cases with venous-graft anastomosis (VGA) stenosis (79.7%), 13 cases of puncture zone stenosis (20.3%), 14 cases of in SG stenosis (21.9%), 8 cases of pseudoaneurysm treatment (12.5%) (1 treatment area might have had more than 1 characteristic). Thirty-six patients presented with thrombosis (56.2%), and 31 of 64 case were de novo treatment areas (48.4%). Primary outcome measurements were technical success and post-intervention primary patency (PIPP) at 6 months, whereas secondary outcome measurements included factors influencing primary outcome.ResultsTechnical success was 100%. Median PIPP was 336 days, and 73.6% of treatment areas were patent at 6 months. There were no significant differences in terms of PIPP when de novo treatment areas were compared with restenotic areas (519 vs. 320 days, respectively; P = .1); patients who presented with versus those who presented without thrombosis (320 vs. 583 days, respectively; P = .07); puncture zone stenosis or elsewhere (329 vs. 686 days, respectively; P = .52); and VGA stenosis or elsewhere (336 vs. 335 days, respectively; P = .9).ConclusionsUse of the Covera SG for AVG treatment was safe and effective in every type of treatment area presented in this retrospective analysis. 相似文献
7.
8.
9.
10.