全文获取类型
收费全文 | 31589篇 |
免费 | 1559篇 |
国内免费 | 910篇 |
专业分类
耳鼻咽喉 | 554篇 |
儿科学 | 819篇 |
妇产科学 | 269篇 |
基础医学 | 3281篇 |
口腔科学 | 1218篇 |
临床医学 | 1964篇 |
内科学 | 5214篇 |
皮肤病学 | 957篇 |
神经病学 | 3232篇 |
特种医学 | 1417篇 |
外国民族医学 | 4篇 |
外科学 | 4086篇 |
综合类 | 2934篇 |
现状与发展 | 2篇 |
预防医学 | 1294篇 |
眼科学 | 636篇 |
药学 | 4703篇 |
6篇 | |
中国医学 | 777篇 |
肿瘤学 | 691篇 |
出版年
2023年 | 233篇 |
2022年 | 430篇 |
2021年 | 827篇 |
2020年 | 473篇 |
2019年 | 657篇 |
2018年 | 782篇 |
2017年 | 672篇 |
2016年 | 560篇 |
2015年 | 618篇 |
2014年 | 1077篇 |
2013年 | 1621篇 |
2012年 | 935篇 |
2011年 | 1028篇 |
2010年 | 963篇 |
2009年 | 1028篇 |
2008年 | 1136篇 |
2007年 | 1097篇 |
2006年 | 1024篇 |
2005年 | 897篇 |
2004年 | 875篇 |
2003年 | 958篇 |
2002年 | 1784篇 |
2001年 | 2088篇 |
2000年 | 2249篇 |
1999年 | 1550篇 |
1998年 | 1486篇 |
1997年 | 1402篇 |
1996年 | 900篇 |
1995年 | 619篇 |
1994年 | 438篇 |
1993年 | 344篇 |
1992年 | 347篇 |
1991年 | 330篇 |
1990年 | 266篇 |
1989年 | 293篇 |
1988年 | 234篇 |
1987年 | 209篇 |
1986年 | 183篇 |
1985年 | 258篇 |
1984年 | 223篇 |
1983年 | 197篇 |
1982年 | 149篇 |
1981年 | 158篇 |
1980年 | 111篇 |
1979年 | 100篇 |
1978年 | 69篇 |
1977年 | 51篇 |
1976年 | 34篇 |
1975年 | 24篇 |
1974年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
《Immunity》2021,54(10):2245-2255.e4
23.
24.
25.
Hideya Yamamoto Yasuki Kihara Shinichiro Fujimoto Hiroyuki Daida Kazuhiro Kobuke Yoshitaka Iwanaga Shunichi Miyazaki Tomohiro Kawasaki Takashi Fujii Sachio Kuribayashi 《Journal of Cardiovascular Computed Tomography》2021,15(2):148-153
BackgroundWhether coronary plaque characteristics assessed in coronary computed tomography angiography (CCTA) in association with the coronary artery calcium score (CACS) have predictive value for coronary events is unclear. We aimed to examine the predictive value of the CACS and plaque characteristics for the occurrence of coronary events.MethodsAmong 2802 patients who were analyzed in the PREDICT registry, 2083 with suspected coronary artery disease (CAD) were studied using post hoc analysis. High-risk plaques were defined as having ≥2 adverse characteristics, such as low computed tomographic attenuation, positive remodeling, spotty calcification, and napkin-ring sign. An adjudicative composite of coronary events (cardiac death, nonfatal acute coronary syndrome, and coronary revascularization ≥3 months after indexed CCTA) were analyzed.ResultsSeventy-three (3.5%) patients had coronary events and 313 (15.0%) had high-risk plaques. Multivariate Cox proportional hazard analysis showed that high-risk plaques remained an independent predictor of coronary events (adjusted hazard ratio [HR] 1.95, 95% confidence interval [CI] 1.13–3.34, P ?= ?0.0154), as well as the log-transformed CACS (adjusted HR 1.24, 95% CI 1.11–1.39, P ?= ?0.0002) and the presence of obstructive stenosis (adjusted HR 5.63, 95% CI 3.22–10.12, P 0.0001). In subgroup analyses, high-risk plaques were independently predictive only in the low CACS class (<100).ConclusionThis study shows that assessment of adverse features by coronary plaque imaging independently predicts coronary events in patients with suspected CAD and a low CACS. Our findings suggest that the clinical value of high-risk plaques to CACS and stenosis assessment appears marginal. 相似文献
26.
27.
28.
B. Kowall N. Lehmann A.A. Mahabadi S. Moebus R. Erbel K.H. Jöckel A. Stang 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(3):228-235
Background and aims
There is controversy on the potentially benign nature of metabolically healthy obesity (MHO), i.e., obese persons with few or no metabolic abnormalities. So far, associations between MHO and coronary artery calcification (CAC), a measure of subclinical atherosclerosis, have mainly been studied cross-sectionally in Asian populations. We assessed cross-sectional and longitudinal MHO CAC associations in a Caucasian population.Methods and results
In the Heinz Nixdorf Recall Study, a population-based cohort study in Germany, CAC was assessed by electron-beam tomography at baseline and at 5-year follow-up. For cross-sectional and longitudinal analyses, we included 1585 participants free of coronary heart disease at baseline, with CAC measurements at baseline and at follow-up, and with either normal weight (BMI 18.5–24.9 kg/m2) or obesity (BMI ≥30.0 kg/m2) at baseline. We used four definitions of MHO. In our main analysis, we defined obese persons as metabolically healthy if they met ≤1 of the NCEP ATP III criteria for the definition of the metabolic syndrome – waist circumference was not taken into account because of collinearity with BMI.Persons with MHO had a higher prevalence of CAC than metabolically healthy normal weight (MHNW) persons (prevalence ratio = 1.59 (95% confidence interval 1.38–1.84) for the main analysis). Persons with MHO had slightly larger odds of CAC progression than persons with MHNW (odds ratios ranged from 1.17 (0.69–1.99) to 1.48 (1.02–2.13) depending on MHO definition and statistical approach).Conclusion
Our analyses on MHO CAC associations add to the evidence that MHO is not a purely benign health condition. 相似文献29.
Lesley A. Inker Morgan E. Grams Andrew S. Levey Josef Coresh Massimo Cirillo John F. Collins Ron T. Gansevoort Orlando M. Gutierrez Takayuki Hamano Gunnar H. Heine Shizukiyo Ishikawa Sun Ha Jee Florian Kronenberg Martin J. Landray Katsuyuki Miura Girish N. Nadkarni Carmen A. Peralta Dietrich Rothenbacher Mark Woodward 《American journal of kidney diseases》2019,73(2):206-217
30.
D. Sforza G. Iaria L. Petagna A. Parente A. Anselmo F. Sergi S. Marzio F. Corrado S. Telli T.M. Manzia G. Tisone 《Transplantation proceedings》2019,51(1):140-142