全文获取类型
收费全文 | 242594篇 |
免费 | 7186篇 |
国内免费 | 5159篇 |
专业分类
耳鼻咽喉 | 1515篇 |
儿科学 | 7314篇 |
妇产科学 | 3881篇 |
基础医学 | 24974篇 |
口腔科学 | 2724篇 |
临床医学 | 21515篇 |
内科学 | 40968篇 |
皮肤病学 | 1407篇 |
神经病学 | 19901篇 |
特种医学 | 11273篇 |
外国民族医学 | 41篇 |
外科学 | 35589篇 |
综合类 | 14179篇 |
现状与发展 | 17篇 |
一般理论 | 2篇 |
预防医学 | 22217篇 |
眼科学 | 4561篇 |
药学 | 16701篇 |
74篇 | |
中国医学 | 4257篇 |
肿瘤学 | 21829篇 |
出版年
2024年 | 226篇 |
2023年 | 1204篇 |
2022年 | 2859篇 |
2021年 | 3610篇 |
2020年 | 2610篇 |
2019年 | 2380篇 |
2018年 | 24073篇 |
2017年 | 19250篇 |
2016年 | 21376篇 |
2015年 | 4025篇 |
2014年 | 4724篇 |
2013年 | 4003篇 |
2012年 | 11627篇 |
2011年 | 26447篇 |
2010年 | 21924篇 |
2009年 | 13898篇 |
2008年 | 22751篇 |
2007年 | 25068篇 |
2006年 | 4079篇 |
2005年 | 5546篇 |
2004年 | 5529篇 |
2003年 | 6451篇 |
2002年 | 4259篇 |
2001年 | 1941篇 |
2000年 | 2170篇 |
1999年 | 2123篇 |
1998年 | 1446篇 |
1997年 | 1541篇 |
1996年 | 1097篇 |
1995年 | 984篇 |
1994年 | 861篇 |
1993年 | 550篇 |
1992年 | 638篇 |
1991年 | 603篇 |
1990年 | 570篇 |
1989年 | 468篇 |
1988年 | 376篇 |
1987年 | 322篇 |
1986年 | 270篇 |
1985年 | 201篇 |
1984年 | 120篇 |
1983年 | 91篇 |
1982年 | 62篇 |
1981年 | 52篇 |
1980年 | 67篇 |
1979年 | 40篇 |
1938年 | 60篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
33.
34.
X Dong M He X Song B Lu Y Yang S Zhang N Zhao L Zhou Y Li X Zhu R Hu 《Diabetic medicine》2007,24(12):1482-1486
AIMS: Our aim was to assess performances of the Cockcroft-Gault and simplified Modification of Diet in Renal Disease (MDRD) formulae in estimating glomerular filtration rate (GFR) in Chinese diabetic populations and their association with vascular risks. METHODS: A total of 1009 patients with Type 2 diabetes were categorized into low estimated GFR groups (GFR < 60 ml/min/1.73 m(2)) and control groups by the two equations. The performances of these formulae were assessed at different stages of kidney function. Carotid artery intima-media thickness (IMT) and the prevalence of diabetic retinopathy or albuminuria were compared among the groups. The ability of these formulae to identify established vascular risk markers using sensitivity, specificity, positive and negative predictive values were also compared. RESULTS: The prevalence of low estimated GFR was 32.7% with the Cockcroft-Gault formula and 5.2% with the MDRD formula, respectively. In low estimated GFR subjects by the MDRD formula, IMT was significantly thicker than those by the Cockcroft-Gault formula (1.2 mm vs. 1.0 mm; P < 0.05), with a higher prevalence of albuminuria (78.4 vs. 52.8%, P < 0.05) and diabetic retinopathy (46.5 vs. 30.5%; P < 0.05). The Cockcroft-Gault formula gave a specificity of 71.7% and a sensitivity of 37.0%, and the MDRD formula gave a specificity of 96.6% and a sensitivity of 7.9% in estimating low GFR relevant for established vascular risks. CONCLUSIONS: These formulae performed differently in Chinese diabetic populations. The simplified MDRD formula is minimally superior to the Cockcroft-Gault formula for its high specificity and positive predictive values in estimating low GFR relevant for vascular risks. 相似文献
35.
Background
Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population. 相似文献36.
随着"三医改革"的不断深入,医疗市场的竞争日趋激烈,人们对医院管理在生存和发展中的重要作用也日益关注.由于中医院面临着管理理念、资源优化、人才构筑和公平竞争的诸多问题,以往的经验管理已不能适应时代性、国际化的要求.面对瞬息万变的生存环境,需要各级中医医院能够主动参与竞争,充分发挥中医药特色,强化自身优势,对市场的变化迅速作出反应,这对中医医院管理工作提出了更高的要求. 相似文献
37.
38.
Background
The fibromyalgia syndrome (FMS) is suggested to be a manifestation of depression or affective spectrum disorder. We measured the cognitive style of patients with FMS to assess personality styles in 44 patients with fibromyalgia syndrome (FMS) by comparing them with 43 patients with major depressive disorder (MDD) and 41 healthy controls (HC). 相似文献39.
40.
Xiaoguang Zhu Raymond Q Migrino Robert S Hellman Tejas Brahmbhatt Ming Zhao 《Nuclear medicine communications》2008,29(9):764-769
OBJECTIVE: The C2A domain of Synaptotagmin I is a molecular probe for the specific imaging of cell death. Here we test the hypothesis that the uptake of 99mTc-C2A in the acute phase of an infarction is associated with cardiac dysfunction in follow-ups. METHODS: The left coronary artery was occluded in Sprague-Dawley rats for 0, 10, 20, and 30 min. 99mTc-C2A was injected intravenously at 2 h of reperfusion. Anterior planar images were acquired with one million counts on a gamma camera 3 h after injection. 99mTc-C2A uptake was calculated as the total counts in the left ventricle region minus blood pool signal. The in-vivo signal detected was correlated with wall motion score index at 1 and 3 weeks follow-ups measured by echocardiography. RESULTS: 99mTc-C2A uptake was higher with increased ischemic time (2244+/-852, 4054+/-1223, and 6178+/-1451 for 10, 20, and 30 min ischemia, analysis of variance P<0.001). A significant correlation was found between 99mTc-C2A uptake and wall motion score index at 1 week (R=0.800, P=0.0006) and 3 weeks (R=0.810, P=0.0008). CONCLUSION: In this ischemia/reperfusion model, 99mTc-C2A uptake in the acute phase was associated with functional abnormality at 1 and 3 weeks. This demonstrates the potential diagnostic and prognostic value of 99mTc-C2A as a novel imaging agent. 相似文献